About Longda

Domestic First-class Machinery and Equipment Design and Manufacture Production Base

Jiangsu Longda Machinery Equipment Co., Ltd. is a first-class domestic machinery and equipment design and manufacturing base established in Gaochun, Nanjing in 2000. The registered capital is 30 million yuan, covering an area of more than 55000 square meters. The existing assets are 63.55 million yuan and 260 employees, of which 42 are technicians. The company owns five subsidiaries such as Wenzhou, Jiangsu and Japan, and has established a R&D center in Beijing in 2008.

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Domestic First-class Machinery and Equipment Design and Manufacture Production Base

Application Area

Domestic First-class Machinery and Equipment Design and Manufacture Production Base

Longda has entered the field of environmental protection since 2006. It mainly provides Mixing devices, FGD Aigs and Flue Dampers in FGD projects of power plants. In recent years, it has added water treatment equipment such as dredgers and other products. Over the past 10 years, it has provided high-quality service for more than 600 power plant FGD projects cross the country.

Environmental

In 1989, the company began to cooperate with chemical enterprises to develop and produce mechanical seals for pumps and vessels. In 1990s, it began to design and produce reducers and mixers for the industry. By now, it has 26 patents and has drafted four national industry standards. Longda has been a well-known brand in the industry for more than 20 years.

Petrochemical

Casting Branch has been set up in Nanjing since 2008, and quality control has been carried out from the beginning of the production; Elevator accessories has begun manufactured since 2014, and is currently the designated supplier of ThyssenKrupp elevator in Germany; production of lithium battery coating machine framework since 2018, and is currently the designated supplier of Hirano and Murata Electronics in Japan.

Precision Machinery

Longda can design and customize matching products according to the actual working conditions of the manufacturer. For more than 20 years, Longda has provided reaction vessel mixing device and mechanical seal for hundreds of biomedical enterprises. Good products and high-quality service make Longda a long-term supplier for many enterprises.

Pharmaceutical

In recent years, Longda has been committed to cooperating with relevant parties in the development and production of high-tech products such as seawater desalination treatment equipment accessories, automatic assembly lines for packaging and injection moulding profiles.

Others

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Domestic First-class Machinery and Equipment Design and Manufacture Production Base

Daily inspection and maintenance of the gearbox
        Daily check the oil level, oil temperature and pressure is normal, check the output of the reducer, the input end and the pipe system at each joint for oil leakage, check the temperature of the bearings is normal, listen to the sound of normal operation, etc., found abnormalities should be immediately excluded.

         1. Daily inspection content.

         The oil temperature (temperature rise) of the reducer is normal.

         Observe whether the oil pump and cooler are open, whether the lubricating oil road is smooth, and whether the current and pressure of the roller press are normal.

         Check whether the sound of the reducer is normal and whether there is any strange sound.

         2、Weekly inspection content.

         Use kerosene or gasoline to clean the filter and magnetic rod and the inner cavity of the filter shell and wipe clean, the foreign matter from the filter cleaning needs to be precipitated, preserved and analyzed, when there are copper chips need to be cleaned regularly every two days, observe the change of copper chips, if there is no reduction then it should be stopped immediately to open the box to check, which is the precursor of the bearing cage non-normal wear.

         After cleaning the reducer filter should add the loss of lubricating oil, pay attention to the added lubricant grade, quality and use of the same.

        Check whether the bolts are loose, and tighten them immediately if they are loose.

        Check the input and output shafts of the reducer for oil seepage, noise and temperature abnormalities.

        Check whether the coupling bolts between the motor and reducer are tightened every month, and check whether the coupling bolts between the reducer and the installation base are tightened every week.

        3. Monthly inspection content.

        Tighten the bolts connecting the reducer to the torque disk and the bolts of the locking disk, pay attention to the tightening method according to the specification requirements.

        Check whether the heat exchange of the cooler is normal, whether the water pressure and flow rate have changed, and whether cleaning measures need to be taken.

       Check the last oil change time, ensure that the oil is changed every 6 months (if found deterioration, emulsification, etc. should be replaced immediately).

        4. Annual inspection content.

        Stop the machine for maintenance, remove the dust from the input and output of the reducer, clean the breathable cap, and repaint the appearance of paint loss.

        Replace damaged components, according to the equipment in the usual use of the process of the replacement of wear and tear parts.

        Check whether the locking plate bolts are tightened, and tighten them again with the rated torque.

        Clean the cooler and circulating system pipeline scale. Note that when disassembling the pipeline, you need to wrap the joints with a clean cloth to avoid dust entering the reducer.

       Every three years need to return to the factory to open the machine for overhaul, replace bearings, oil seals and other damaged parts, and repair or replace individual wear parts.

       The above is the basic points of daily inspection and maintenance of the reducer brought to you by Lunda, the use of qualified equipment is also an important guarantee of our own personal safety.
2022-07-30
How can the mixing efficiency of the mixer be improved?
        In our ordinary life, probably in doing something, it is necessary to go to the mixing, so that the mixing of such a process, or can really attract the attention of people. But also, in many enterprises production, is also in order to be able to go to production, so that will be used to the mixer, so you can go to complete the current mixing.

        Because of this, such a mixer, has begun to be used in many places, especially in many industries and fields will be used to the machinery and equipment, in the use of this equipment, the mixing efficiency of the problem, is to become a lot of business concerns to the problem.

        This time, in the use of such equipment, or need to take into account how the performance of the equipment itself, which is very important, this time, will directly affect the efficiency of the use. Not only that, because such equipment will be in the classification is more, so is able to not through the nature of the material to mix, that the enterprise in the choice of equipment, or to consider their own to mix the material.

        So now many enterprises, if the time to choose the mixer, it is necessary to consider a lot of aspects, including the type of equipment, there is such equipment is for what kind of material to mix, so that only in the choice of good performance equipment, can go to complete the mixing of materials, to really ensure the efficiency of the mixing, become the The enterprise can choose to the equipment.
搅拌器画册下载|减速机|挡板门|机械密封-江苏隆达机械设备有限公司https://www.longdaml.com
2022-08-03
Liquid-liquid dispersion and stirring and mixing of mutually soluble liquids
I. Liquid-liquid dispersion operation is usually employed for the following purposes.
      (1) To increase the phase interface through liquid-liquid dispersion. 
      (2) To reduce the diffusion resistance outside the dispersed phase droplets.
      (3) to generate turbulence to promote concentration and temperature homogenization
      (4) To make the droplets of the dispersed phase repeatedly break up and condense, thus promoting the mass transfer between the droplets of the dispersed phase.
        In liquid-liquid dispersion, stirring plays a key role in controlling the aggregation, breakage and floating of droplets. Stirring affects the strength and direction of liquid flow and then affects the distribution and uniformity of droplets.
Second, the stirring and mixing of mutually soluble liquids
       (1), mixing and stirring of low-viscosity liquids
         Stirring of interdigitated liquids is two or more interdigitated liquids under the action of stirring, any point of concentration, density, temperature and other physical state to achieve uniformity of the process, usually also known as the mixing process, it is the basic process of stirring a process. Sometimes in order to emphasize the characteristics of homogeneous stirring. Also known as blending or blending.
The main feature of the mixing process of low-viscosity interdigitated liquids is that there is no phase interface for the transfer process. For a purely physical mixing process, the mixing of low-viscosity inter-soluble liquids are easy to complete the process. However, if the mixing process is accompanied by chemical reactions, it tends to complicate the process, mainly in two aspects: first, there are more stringent requirements for the mixing time to avoid some undesired side reactions; second, most of the heat of reaction is exported or imported heat, thus increasing the difficulty of controlling the mixing process. The mixing operation of low-viscosity inter-soluble liquids is generally carried out in a turbulent state. Therefore, this process has a strong body diffusion, turbulent diffusion and molecular diffusion, in the process of macroscopic mixing accompanied by a strong microscopic mixing process.
        In order to achieve a homogeneous state of mixing liquid, the mixing of low-viscosity interdigitated liquids first requires the provision of sufficient circulation to avoid dead zones in the equipment, so that all stirred liquids can produce rapid convective circulation movement. Secondly, it is also required that the stirrer caused by the intensity of liquid turbulence or shear rate to be large, especially when the viscosity difference between the two liquids is relatively large, the presence of shear will facilitate the dispersion of high-viscosity liquids in the equipment, which is conducive to the strengthening of turbulent diffusion. In addition, when the number of two liquids that need to be mixed differs greatly, the location of a small amount of liquid filling is important, and the appropriate location is the impeller area, or near the impeller inlet, to ensure that the feed can be fast through the impeller, prompting the mixing liquid to quickly reach concentration homogenization.
        The main performance indicators to evaluate the mixing effect of the mixer are mixing time, energy consumption and shear performance. Among them, the mixing time is an important performance indicator to determine the mixing effect.
       (2), mixing and blending of highly viscous fluids
Industrial production of high-viscosity fluids are increasingly used, many polymers are high-viscosity fluids, they are mostly non-Newtonian fluid. In the mixing process, the viscosity will also change, thus the requirements of the stirrer is high, requiring the stirrer to adapt to changes in viscosity to complete the mixing operation. Mixing of highly viscous fluids often refers to the mixing of mutually soluble high-viscosity fluids. However, the mixing of highly viscous fluids in industry also includes dispersion, solid dissolution, chemical reaction and other non-homogeneous operations.
        Stirring operation, the use of stirrers for low-viscosity mutual solution to cause turbulence is not difficult but viscosity reaches a higher level, due to the influence of viscous forces, there is only a laminar flow state. Particularly difficult is that this laminar flow can only appear in the vicinity of the stirrer, a little further away from the paddle where the high viscosity liquid is still stationary. This will be difficult to cause the circulation of liquid flow in the stirring equipment, that is, there will be a dead zone in the equipment, mixing, dispersion, heat transfer, reaction, and other mixing processes are not conducive. Therefore, the problem of high viscosity liquid stirring is to solve the problem of fluid flow and circulation. In this case, you can not rely on increasing the stirring speed to increase the circulation flow of the stirrer, because the fluid viscosity is high, the stirrer discharge less flow, too high a speed will also form a trench flow in the high-viscosity solution, while the surrounding liquid is still a dead zone. A more effective solution is to try to make the stirrer to push a wide range of fluids. Therefore, the ratio of the diameter of the stirrer to the inner diameter of the equipment and the ratio of the width of the paddle to the inner diameter of the equipment for high-viscosity liquids are required to be relatively large, and sometimes the number of layers of the stirrer is required to increase the stirring range.
        From the point of view of the mixing mechanism, in the laminar flow area mixed with high viscosity liquid, the liquid unit subjected to shear subdivision is elongated, elongated or divided, with the increase in shear time, gradually achieve mixing. At the same time, because the shear field within the mixing equipment is not uniform, such as anchor stirrer in the gap between the anchor and the wall of the kettle is a strong shear zone, the liquid mixing rate is faster, while the middle region of the kettle is a low shear zone, the mixing rate is slower, so the high shear zone and low shear zone between the liquid exchange rate or liquid circulation capacity in the kettle is also an important factor affecting mixing. In addition, the speed fluctuations of the fluid in the equipment can also promote mixing. In other words, the mixing rate of high-viscosity liquids depends mainly on the relative movement rate between the stirrer and the surface of the kettle wall and the distance between each other. In the actual production process, the commonly used viscous fluid stirrers are anchor stirrers, ribbon stirrers, frame stirrers, etc.
        The main performance indicators to evaluate the mixing effect of the mixer are mixing time, mixing energy per unit volume, etc.. Among them, mixing time is an important performance index to judge the mixing effect.
搅拌器画册下载|减速机|挡板门|机械密封-江苏隆达机械设备有限公司https://www.longdaml.com
2022-08-04
Composition and classification of stirring device
         Stirring device mainly consists of stirring paddle or impeller and attached components. The transmission device is mainly composed of motor, reducer, bracket, etc. The stirring shaft system is mainly composed of stirring shaft, bearing, coupling, etc.

        The reason for setting the baffle or deflector: the agitator is prone to swirling flow when the speed is high, which affects the stirring effect.

        Propulsion stirring device is not high degree of turbulence when stirring, mainly volume circulation, high circulation rate, small shear effect, good up and down tumbling effect, simple structure, easy to manufacture, etc. Suitable for low viscosity, high flow rate, with a smaller stirring power can get a better mixing effect, mainly used for liquid-liquid mixing, is the temperature uniformity, in solid-liquid to prevent solids from settling.

        Paddle stirrer is a kind of stirrer with simple structure, its stirring part is two blades. Paddle agitator can be divided into flat paddle agitator and inclined paddle agitator according to the shape characteristics of the blades. The flat paddle agitator generates radial force and the inclined paddle agitator generates axial force. Paddle agitator is suitable for low viscosity liquids, suspensions and dissolved liquids.

         The rotating paddle agitator is a type of agitator with two or three propeller-type rotating paddles as the mixing parts. The rotating paddle stirrer has a high rotating speed when stirring, which can make the material move in the axial direction, so that the material can be fully circulated and mixed. The rotating paddle mixer is mostly used for mixing low viscosity liquids, suspensions, corrosive liquids and other materials.

        The turbine mixer usually has two to four blades, which can be flat or curved, and is mounted on a horizontal disc, which creates a highly turbulent radial flow of material when rotating. The turbine mixer is suitable for mixing between gases or liquids with low viscosity and poor mutual solubility.

        Anchor mixers have blades similar in shape to the anchor of a ship. The blade size of the anchor agitator is similar to the size of the mixing tank, and only a small gap is left between the two after the combination, so that the blade of the anchor agitator can clearly mix the reactants on the inner wall of the tank when rotating and maintain the mixing effect of the agitator. The anchor type stirrer can be used to stir materials with high viscosity.

        The spiral belt agitator has two or three spiral belts mounted on a screw in the middle of the agitator. The pitch of the spiral belt agitator determines the outer diameter of the belt. The spiral belt agitator is usually operated in laminar flow condition. It is suitable for mixing liquid fluids with high viscosity.

        The selection of agitator is mainly based on the nature of the material, the purpose of mixing and the performance characteristics of various agitators.

        According to the purpose of mixing selection: low viscosity homogeneous liquid mixing generally choose the propulsion type, turbine type, paddle type. For non-homogeneous liquid-liquid dispersion, choose turbine, propeller, paddle type; for gas-liquid dispersion, choose flat disc agitator; for solids suspension, choose propeller, open turbine agitator; for solids dissolution, choose open turbine agitator; for easy caking, choose paddle or frame agitator; for crystallization, choose turbine, paddle type. For heat transfer-based mixing operation, choose turbine type.

搅拌器画册下载|减速机|挡板门|机械密封-江苏隆达机械设备有限公司https://www.longdaml.com

2022-08-05
How to choose a reducer
        To solve this problem, we first need to understand certain parameters of the reducer, which parameters need to know in the end? Let Lunda Xiaobian give you a rant. What determines the calibration of the thermal power in the reducer? It is the temperature of the surrounding environment. This is a data we need to analyze, as a reducer, it should have a motor inside, the number of stages of this motor is exactly how much, appropriate or inappropriate, and what is its power, we also need to do an in-depth analysis, in addition, how the safety factor of the reducer, the safety of everyone can not be reliably guaranteed, is the most important, must not be ignored. There is also the reducer in what equipment to use, as well as the use of some of its possible results, but also absolutely can not be sloppy matters. The reducer output shaft radial force and axial force calibration, is also a point that needs to be noted.

        The power of the motor. The power of the motor should be selected according to the power required by the production machinery, while the reducer is selected according to the power or torque to be transmitted, as well as the speed required for the work.

        The power of the motor. The power of the motor should be selected according to the power required by the production machinery, and the motor should be operated under the rated load as much as possible. The following two points should be noted when choosing.

        (1) If the motor power is too small. (1) If the motor power is too small, it will be "small horse-drawn car" and cause the motor to be overloaded for a long time. Make its insulation damaged by heat. Even the motor will be burned up.

         (2) If the motor power is too large. It will appear "big horse-drawn car" phenomenon. Its output mechanical power can not be fully utilized, power factor and efficiency are not high, not only to the user and the grid is not good. And it will also cause waste of electricity.

         To choose the correct power of motor, the following calculation or comparison must be made. 
江苏隆达机械设备有限公司
         (1)For constant load continuous working mode, if we know the power of the load (i.e. the power on the production machinery shaft) Pl(kw). The required motor power P(kw) can be calculated according to the following formula: P=P1/n1n2 where n1 is the efficiency of the production machinery; n2 is the efficiency of the motor. That is, the transmission efficiency. According to the above formula to find out the power, not necessarily the same as the product power. Therefore. The rated power of the selected motor should be equal to or slightly greater than the calculated power. Example: The power of a production machine is 3.95kw, the mechanical efficiency is 70%, if the efficiency of the motor is 0.8, how much kw should the power of the motor be? Solution: P1/n1n2=3.95/0.7*0.8=7.1kw Because there is no 7.1kw this specification. So use 7.5kw motor.

         (2)The motor of short-time working quota. Compared with the motor with the same power and continuous working quota, the maximum torque is large, the weight is small, and the weight is small. The maximum torque is large, the weight is small and the price is low. Therefore, when the condition permits, the motor with short working quota should be used as much as possible.

        (3) For the motor with intermittent working quota, the power should be selected according to the size of the load duration rate, and the motor specially used for intermittent running mode should be chosen. The formula for calculating load duration Fs% is FS%=tg/(tg+to)×100% where tg is working time, t. is stopping time min; tg10to is working cycle, and the role of reducer is to improve the torque, to choose a good motor, we must know the maximum starting torque torque*speed=power and to ensure that the motor is self-locking at standstill, not to let the motor rotate

       1. P = W / t This is a formula applicable to any power, of course, also applies to mechanical power

       2.P=F*V This formula is only applicable to mechanical power.

       F means the power of the machinery, V is the speed of uniform motion of the machinery
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2022-07-25
A simple understanding of the cycloid reducer pressure lubrication principle
        Cycloid pinwheel reducer is a kind of application of planetary transmission principle, using a novel transmission device of cycloid pintooth meshing. The whole transmission device of cycloid pinwheel reducer can be divided into three parts: input part, reduction part and output part. The input shaft is equipped with a double eccentric sleeve misaligned 180°, and the eccentric sleeve is equipped with two roller bearings called swivel arms to form the H mechanism, the center hole of the two cycloid wheels is the raceway of the swivel arm bearings on the eccentric sleeve, and the cycloid wheels are meshed with a set of circularly arranged needle teeth on the needle gear to form the internal meshing reducer with a tooth difference. (In order to reduce the friction, in the speed reducer with small ratio, the needle teeth are equipped with a needle tooth sleeve).

        When the input shaft rotates with the eccentric sleeve for one week, the motion of the cycloid becomes a plane motion with both revolution and rotation because of the characteristics of the tooth profile on the cycloid and its limitation by the pin teeth on the pin gear. The low speed self rotation motion of the cycloid is transmitted to the output shaft through the pin by the W output mechanism, thus obtaining a lower output speed. Cycloid reducer lubrication is as follows.

        1, horizontal cycloid reducer under normal circumstances using oil pool lubrication, the oil surface height to maintain the middle of the sight window can be, in poor working conditions, the ambient temperature is at a high temperature can be used to circulate lubrication.

        2, the cycloid reducer at room temperature generally choose 40 # or 50 # mechanical oil lubrication, in order to improve the performance of the reducer, prolong the service life of the cycloid reducer, it is recommended to use 70 # or 90 # extreme pressure gear oil, in the case of high and low temperature work can also be reconsidered lubricant.
江苏隆达机械设备有限公司
        3, vertical installation of planetary cycloid reducer to prevent oil pump oil break, in order to avoid damage to the components of the reducer.

        4, when refueling can be screwed open the upper vent cap of the seat can be refueled. When releasing oil, unscrew the oil release plug on the lower part of the seat to release the dirty oil. The reducer is shipped without internal lubricant.

         5, the first refueling operation 100 hours should be replaced with new oil, (and the internal dirt oil flush clean) and then work continuously, every six months to replace (8-hour working system), if the working conditions are poor can be appropriate to shorten the oil change time, practice has proved that reducer frequent cleaning and oil change (such as 3-6 months) for extending the service life of the reducer has an important role. In the process of use should be frequently supplemented with lubricating oil.

        6, reducer has been added lubricating grease, every six months to replace. The grease is aluminum disulfide-2# or 2L-2# lithium-based lubricating grease.
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2022-07-26
Correct selection of mechanical seals to prevent leakage of liquid pumps
       For more than 100 years, a variety of seal materials such as packing have been used to reduce the outward leakage of liquid from the liquid pump casing along the main shaft. Although the modern process used in the liquid pump, still widely used the oldest seal design - stuffing box, because of its low start-up costs, and familiar to the plant staff. However, due to environmental concerns, the use of packing seals has gradually become unacceptable, especially for the more prevalent and corrosive liquids in modern processes. Therefore, in practical applications, mechanical seals are increasingly used instead of packing seals.

        The basic elements of the seal mechanical seal is the use of two planes running on the principle of mutual friction to achieve the purpose of sealing. The rotating sealing surface is mounted on the main shaft of the liquid pump, while the fixed sealing surface is mounted inside the sealing gland. Since one sealing surface is in motion and the other is stationary, this type of seal is called a dynamic seal. The sealing between the rotating surface and the stationary surface is the most critical factor to determine the sealing performance of the basic mechanical seal, in which there are four leakage paths to be sealed: 1. the path between the sealing surface; 2. the path between the rotating surface and the spindle; 3. the path between the stationary surface and the gland; 4. the path between the gland and the stuffing box. The latter two leakage paths are generally sealed statically because there is no relative motion between the two parts. This part of the seal is usually referred to as a tertiary seal with a gasket or an O-ring that is compatible with the process fluid.

        In older seal designs, the secondary seal, which is located under the rotating surface, is left with some clearance to move back and forth on the spindle and is therefore susceptible to wear and premature failure. In the newer seal design, however, the secondary seal is stationary and therefore avoids the problem of wear and corrosion on the main shaft. In normal operation of a liquid pump, the pressure between the rotating and stationary surfaces is maintained in a sealed state by the pressure generated by the fluid in the stuffing box, which is maintained by the pressure generated by the spring during start-up and shutdown (or even by the pressure of the spring instead). Most mechanical seal designs use softer materials for the rotating surfaces, allowing them to rotate and rub against the harder stationary surfaces. For many years, the most common combination was to use carbon material as the rotating surface to run on a ceramic stationary surface.

        This type of material is still commonly used, but the stationary surface is made of stainless steel or harder materials such as tungsten carbide or silicon carbide. Regardless of the material used, a liquid film must always be maintained between the contact surfaces to provide lubrication. However, in the stuffing box, a combination of spring load and liquid pressure is used to provide a good seal between the sealing surfaces. However, if the sealing pressure is too high, the formation of a liquid film between the contact surfaces is affected, leading to increased heat and premature wear. If the sealing pressure is too low, the gap between the contact surfaces increases, which can easily cause liquid leakage. Seal manufacturers are constantly working to improve the straightness of the contact surfaces, and they use special polishing plates for grinding. Then, they are inspected using a grating plate with a monochromatic light source.

        From this point of view, it is very important that these seal contact surfaces must be handled with care and that installation instructions are strictly followed to ensure that the seal surfaces are properly protected and properly seated. Flexibility in sealing The axial and radial movement of the selected spindle requires a certain amount of flexibility with the spring to ensure a seal between the contact surfaces. However, only a certain degree of flexibility can be provided. The mechanical condition of the liquid pump and its length to diameter ratio (a measure of the ratio of the diameter of the spindle to its extended length, the lower the ratio the better) play an important role in the reliability of the seal. The flexibility of the seal is generally provided by a large main spring and a series of small springs or corrugated seal devices to ensure. Traditional seal designs used in the chemical industry have sealing pressure applied to the rotating surface, which is called a rotary seal because the spring or bellows seal rotates with the spindle. The newer designs have the elastomeric or corrugated seal mounted on a stationary surface. Both of these seal types are very commonly used on today's mechanical seals so that there is some flexibility for installation. Many mechanical seals of early design used a single large spring arranged around the main shaft to provide a strong sealing force on the sealing surface during the start-up of the liquid pump. The seal relies on the rotation of the spindle to tense the spring coil. Later designs of the seal use a series of smaller springs arranged around the spindle to provide a more uniform load pressure on the sealing surface. Since the smaller springs can be installed in advance, most of these seals are completely isolated from the fluid being pumped.

        The use of multiple smaller springs creates a more even load pressure on the sealing surface and therefore greater sensitivity to clogging. For many of the more corrosive applications, the most common design is a metal bellows seal. This bellows consists of a series of metal discs welded together to form a corrugated seal that prevents leakage. The use of this device allows for more uniform sealing pressure between the sealing surfaces, and there is no need for additional secondary seals on the sealing surfaces, so that naturally there is no corrosion and wear. Figure 3 metal bellows sealing device is generally applied to the more corrosive liquids in general, although its main sealing pressure depends on the pressure of the stuffing box itself, but the spring and bellows can compensate the liquid pump in the process of starting and stopping due to the lack of pressure of the spindle movement, so that the sealing surface always maintain a certain sealing pressure. Corrosion and wear problems can cause radial and axial movement of the spindle of a liquid pump for a variety of reasons, including, for example, bearing tolerances, shaft end play, vibration and spindle misalignment.

         In addition, because it is very difficult to maintain absolute parallelism between the contact surfaces, it is normal for the mechanical seal itself to move internally. Such movement is often caused by equipment and installation tolerances, thermal expansion, piping stresses or improper spindle commissioning. In order to keep the sealing surfaces always cooperating with each other, the spring plays a constant regulating role between the mechanical seal and the moving spindle. When a synthetic rubber seal is used between the rotating surface and the spindle, the elastomer moves back and forth across the spindle. This repeated frictional action will abrade the anti-corrosion material on the spindle and lose the protective layer of the spindle's oxide film, which will eventually form wear grooves on the spindle's friction surface, causing fluid to leak from the grooves and increasing the necessary maintenance work or even replacing the spindle. To solve this problem, a replaceable sleeve is usually installed in the stuffing box. However, the only permanent solution to the corrosion and wear problem is to remove the dynamic seal inside it. Today, most major seal manufacturers produce non-corrosive wear type seals to prevent corrosive wear of liquid pump parts. Balanced and unbalanced seals The balance of a mechanical seal has a significant effect on the sealing pressure at the contact surface. This sealing pressure depends on the effective cross section of the seal itself as well as the pressure inside the stuffing box. The opposite cross section of the rotating face of a non-equilibrium seal is completely exposed to the pressure range of the stuffing box, a situation that creates a high sealing pressure between the sealing faces, which can lead to higher operating temperatures and faster wear. Under high temperature operating conditions or where the liquid is corrosive and abrasive, the service life of the mechanical seal can be greatly reduced. Balancing the mechanical seal can reduce the sealing pressure and extend the service life of the seal.

        Generally use the spindle and sleeve with steps to reduce the effective section of the rotating surface, it can achieve the above purpose. However, never adjust the net seal pressure to a level close to zero, as this may result in unstable working conditions between the sealing surfaces and may blow the seal open due to sudden changes. The answer to these sealing problems may be the use of unbalanced seals, and for some services, perhaps better results can be achieved with unbalanced seals. For example, in some applications, there may be more emphasis on safety issues caused by fluid leakage than on the life of the seal. In this case, the choice of seal may be interpreted as a preference for a higher sealing pressure. Similarly, the increase in operating temperature may be insignificant when selecting a seal for a colder fluid. Regardless of the considerations, balanced seals are generally recommended when the pressure in the stuffing box exceeds 50 psi. The most common practice for internal and external seals is to mount the seal inside the stuffing box. However, this practice requires that the wet end of the liquid pump be disassembled during seal maintenance. The main benefit is that the sanitation of the seal is easily controlled. External seals are installed by reversing the orientation of the static sealing surface, with the rotating unit on the main shaft located outside of the stuffing box gland.

       The external seal has the following five main benefits: 1. easy to install; 2. relatively low cost; 3. can be continuously monitored and cleaned; 4. suitable for very small stuffing boxes where the seal cannot be installed internally; 5. less difficult effect on spindle deviation due to its location close to the bearing. Its main disadvantage is that centrifugal force will throw solid particles from under the seal to the contact surface of the seal. Therefore, this type of seal is mainly suitable for clean and non-abrasive fluids. In recent years, breakaway seals have become another important additional feature in external seals. The split seal is a complete assembly that is mounted between the stuffing box and the bearing sleeve. With this design, it is not necessary to disassemble the pump each time the seal needs to be replaced. This type of seal combined with the exploration of other design standards are gradually being developed. As this design is easy to replace the seal, it is important to resist the temptation to just replace the seal, without further investigation of the root cause of the failure. Cartridge seal A cartridge seal is an all-in-one seal that includes all sealing elements, gland and sleeve inside. Since this type of seal does not require They are also well protected against accidental damage, as the sealing surface and sealing elastomer are well protected. These advantages also mean that seal repair and replacement times can be reduced.

         Self-contained, fully functional cartridge seals simplify installation and protect internal components from accidental damage, are available on the market in almost all types of cartridge seals, thus reducing the risk factor in use and saving the maintenance time inherent in using ordinary seals. Double seals and liquid barrier devices use a double sealing surface instead of a single seal to provide a higher degree of leak resistance. Most of these double seals are used for highly volatile, toxic, carcinogenic, hazardous and poorly lubricated fluids.

        There are three general designs of double seals, each of which requires a liquid barrier system between the double sealing surfaces to prevent leakage of liquid or gas. The more commonly used low-cost double seal is a seal mounted back-to-back, with the rotating sealing faces arranged in opposite directions. It often requires a barrier fluid with a pressure higher than the stuffing box pressure, about 20 psl, which ensures that the internal seal is always lubricated by the barrier fluid and also ensures that the sealing surfaces reach a certain sealing pressure. In the more complex structure of the face-to-face type seal, the rotary sealing surface is arranged in a face-to-face manner between them, and they often act in the opposite direction of the same static sealing surface. This type of seal can be used both high-pressure barrier liquid system, and low-pressure barrier liquid system. The rotary face of such seals is installed in a face-to-face manner, and the third design type of seal uses a serial arrangement, that is, both rotary sealing faces leave the impeller and are arranged in the same direction. This type of seal is generally lower than the liquid pump barrier liquid pressure pressure of the pump. In fact, the equivalent of two seals, two stages of pressure reduction of the combined work of the device.

        All types of double sealing devices require a barrier fluid system. They are generally external closed-loop systems where the fluid used internally is generally different, but must match the fluid in the process. The system includes a reservoir with a bit-pick that should be as close to the seal as possible. There is a wide range of design variations for these systems. Some systems use a type of pump ring in the seal, while others use the thermosiphon effect principle. The liquid in the reservoir is often heated or cooled by an auxiliary method. In addition, an alarm device can be added to remind the staff to change the liquid in time. Depending on the nature of the liquid being sealed, the liquid barrier system can work with a pressure lower or higher than the stuffing box pressure. In order to achieve the goal of zero leakage throughout the drive operation, the sealing industry has also developed gas-barrier seals, which use a class of inert gas such as nitrogen instead of a liquid-barrier system. In a double seal with a gas barrier, if there is a failure inside the sealing surface, only the inert gas will leak, while the liquid inside will not leak, thus not causing environmental pollution.

        Regardless of whether liquid or gas is used, the barrier system must be suitable for the specific sealing application and should be able to immediately identify an alarm in the event of any failure inside the sealing surface so that appropriate action can be taken in a timely manner. Environmental control In many applications, where seals are installed, reliable operation of the seal and control of the environment needs to be taken into account and therefore the following points must be noted: 1. The seal should be installed on a high strength spindle with minimum deviation. Although the industry standard specifies a maximum deviation of 0.002in for the seal surface, the requirements for the spindle can be even higher. 2. The seal should be installed in a large diameter seal chamber, which will improve the reliability of the seal. These products are available from almost all liquid pump manufacturers.3. Control the internal pressure of the stuffing box to avoid rabbits reaching the flash point.4. Keep the temperature inside the stuffing box within the operating parameters of the seal material.5. Keep the liquid inside the stuffing box clean.

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2022-07-27
Application of desulfurization agitator
  With the rapid development of the mixing industry, various types of agitators gradually into people's lives, desulfurization agitator as one of them, its as an environmentally friendly equipment, can effectively reduce the pollution of our environment by sulfur, in order to facilitate a better understanding of this equipment, the next to its detailed introduction.
  Which stirring requirements for dissolved oxygen is low, and now the domestic project more perforated tube aeration stirring. Also to ensure uniform air mixing, perforated tube more than arranged into a loop, aeration pipeline material can be selected according to the actual water quality, if the conditions allow the use of plastic pipe as far as possible, the reason is that the steel perforated pipe orifice is easy to oxidation rust. The shedding of oxidation and sediment deposition in the pipe is likely to cause blockage of the perforated pipe orifice. There are also environmental protection companies on the market to develop down-bending ring perforated pipe, the choice of ABS plastic pipe to make the entire pipeline, different pipe diameter perforated pipe and dry pipe using a special pipe reducer coupling connection; Japan developed porous aeration tube, the entire surface are distributed with microscopic pores, can be uniformly produced only micron size of the diameter of the bubble, so the oxygenation and mixing effect is very good. In addition, the stirring dispersion aeration is also a new technology in air mixing.
江苏隆达机械设备有限公司  In the actual engineering application experience, generally in the desulfurization mixer design perforated tube aeration stirring, the required aeration is about 0.01 ~ 0.015 m3 / (min - m2), the opening aperture ≥ 5 mm, because the aperture is too small easy to block. The aperture form generally uses the bottom both sides of 45 ° open hole. In addition, the perforated pipe length should not exceed 10 m; to ensure the effect of aeration and mixing, the perforated pipeline may not be evenly distributed; the perforated pipe diameter is as large as possible, and the friction of the pipe wall is as small as possible.
  Air mixing is generally set in the bottom of the pool perforated pipe, perforated pipe and blower air pipeline connected to the use of compressed air for aeration and mixing. Its main working principle is to use the air and the pool water contact, stirring the water body to prevent the suspended matter in the water body to sink, accelerate the transfer of oxygen in the air to the water body to complete the purpose of oxygenation.
  From this, we know that the specific application of desulfurization agitator, its equipment can be effectively adapted to the mixing work of a variety of different industries, so that it is fully mixed evenly to promote the efficiency of the use of substances.
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2022-07-28
Helical gear reducer common problems and troubleshooting methods
         Helical gear reducer adopts the most optimized, modular combination system advanced design concept, with small volume, light weight, large transmission torque, smooth starting, transmission ratio grading fine and other properties, according to user requirements for any connection and a variety of installation position selection. The following Xiaobian take you together to understand what are the common problems of helical gear reducer?
         Common problems.
         Heat and oil leakage
         In order to improve efficiency, worm gear reducers generally use non-ferrous metals for worm gears, and worm gears are made of harder steel. Because of the sliding friction transmission, the operation will generate more heat, so that the reducer parts and the difference in thermal expansion between the seal, thus forming a gap in the mating surface, lubricating oil liquid due to the rise in temperature becomes thin, easy to cause leakage. There are four main reasons for this situation, one is the unreasonable collocation of materials; two is the poor quality of the meshing friction surface; three is the incorrect choice of lubricant addition; four is the poor assembly quality and use environment.
        Worm wheel wear
        The worm wheel is generally made of tin bronze, and the paired worm material is hardened with 45 steel to HRC4555 or 40Cr hardened to HRC5055 and then ground to a roughness of Ra0.8μm by the worm grinder. the reducer wears slowly in normal operation, and some reducers can be used for more than 10 years. If the wear rate is faster, we should consider whether the selection is correct, whether overload operation, and the material of worm gear, assembly quality or use environment and other reasons.
        Gear wear
        Generally occurs on the vertical installation of the reducer, mainly related to the amount of lubricant added and oil variety. When installed vertically, it is easy to cause insufficient amount of lubricating oil, and when the reducer stops running, the transmission gear oil is lost between the motor and the reducer, and the gears are not protected by proper lubrication. When the speed reducer starts, the gears are not effectively lubricated, resulting in mechanical wear and even damage.
        Worm gear bearing damage
        When a failure occurs, even if the gearbox is well sealed, it is still often found that the gear oil in the reducer is emulsified, and the bearing is rusted, corroded and damaged. This is because after running the reducer for a period of time, the gear oil temperature rises and the condensate generated after cooling mixed with water. Of course, also closely related to the bearing quality and assembly process.
        Helical gear reducer, is a novel reducer transmission device. Using the most optimal, modular combination system advanced design concept, with small size, light weight, large transmission torque, smooth starting, transmission ratio grading fine and other properties. So what to do when the helical gear reducer fails? The following is a summary of a few troubleshooting methods for you.
        Troubleshooting.江苏隆达机械
        Ensure the quality of assembly
        Can buy or homemade some special tools, disassembly and installation of reducer components, try to avoid knocking with other tools such as hammers; replacement gears, worm gear, try to use the original parts and pairs of replacement; assembly output shaft, pay attention to the tolerance fit; to use anti-adhesive or red Dan oil to protect the hollow shaft, to prevent wear and rust or fit area scale, difficult to disassemble when repair.
        Lubricant selection
        Helical gear - worm gear reducer generally use 220 # gear oil, for heavy load, start frequently, the use of poor environment reducer, can choose some lubricant additives, so that the reducer in stop running gear oil is still attached to the gear surface, the formation of protective film, to prevent heavy load, low speed, high torque and start direct contact between the metal. The additive contains seal adjuster and anti-leakage agent, so that the seal remains soft and elastic, effectively reducing lubricant leakage.
        Installation position selection
        The location allows, as far as possible, not to use vertical installation. When installed vertically, the amount of lubricant added is much more than that of horizontal installation, which is likely to cause heat and oil leakage of the reducer.
        Lubrication maintenance
        According to the lubrication work "five" principle for the maintenance of reducer, so that each reducer are responsible for regular inspection, found that the temperature rise is obvious, more than 40 ℃ or oil temperature more than 80 ℃, the quality of oil decline or oil found in more copper powder and produce abnormal noise and other phenomena, to immediately stop using, timely maintenance, to Troubleshoot and replace the lubricant. When refueling, pay attention to the amount of oil to ensure that the reducer gets the correct lubrication.
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2022-07-14
The five advantages of cycloid reducer
        Cycloid reducer can be widely used in petroleum, environmental protection, chemical, cement, conveying, textile, pharmaceutical, food, printing, lifting, mining, metallurgy, construction, power generation and other industries, the following to introduce you to the five advantages of the cycloid reducer!
        1、Large transmission ratio  
        Cycloid reducer has a higher speed ratio, the transmission ratio is 1:7 to 1:87 at the first deceleration; two-stage deceleration rotation ratio of 1:121 to 7569, there is a higher three-stage deceleration, customers can also choose this type according to their own circumstances.  
         2、High transmission efficiency  
         Cycloid reducer because of the machine tooth meshing part of the rolling mesh, gnawing the surface is also no relative sliding, the general efficiency can be in more than 90%.   

         3、Small volume, light weight  

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         The cycloid reducer adopts the planetary transmission principle, the input shaft and output shaft are on the same axis, and has the unique feature of being directly connected with the motor, so that its model gets the smallest possible size. Therefore, the cycloid reducer has the characteristics of small size, compact structure and light weight. Compared with the ordinary two-stage cylindrical gear reducer, the volume can be reduced by more than 2/3; the weight is reduced by about 1/3 or more.
         4、Easy to disassemble and install, easy to maintain  
         Due to the reasonable design of the structure of the cycloid reducer, simple disassembly and installation is easy to maintain, the number of parts used is small, lubrication is also very simple.
         5、Long life, low noise  
         Due to the principle of planetary transmission, the number of cycloid teeth gnawing together during operation, the overlap coefficient is large, the overall body balance operation, the main parts are made of bearing steel quenched and finely ground, the wear is reduced to as low as possible, low so the noise emitted during operation is low and long life.
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2022-07-15
Brief description of the characteristics of cycloid reducer

       Last we told the 5 advantages of the cycloid reducer, today we are more specific to tell a white now on the specific characteristics of the reducer, the next Lunda small make up and you chatter about its its characteristics!


  ★High speed ratio and high efficiency single-stage transmission, it can reach 1:87 reduction ratio, the efficiency is above 90%, if multi-stage transmission, the reduction ratio is greater. Cycloid reducer one-stage drive reduction ratio of 9 ~ 87, two-stage drive reduction ratio of 121 ~ 5133, multi-stage combination can reach tens of thousands, and the needle tooth meshing system sleeve rolling friction, no relative sliding of the meshing surface, so a reduction efficiency of 94%.
  ★Compact structure and small volume because of the planetary transmission principle, the input shaft output shaft in the same axis line, so that its models to obtain the smallest possible size.

  ★Smooth operation and low noise The cycloid needle tooth meshing has a large number of teeth, a large overlap coefficient and a mechanism of machine balance, so that vibration and sound are limited to the smallest possible extent.

      ★The number of pairs of teeth in contact at the same time during operation is large and the overlap is large, resulting in smooth operation, high overload capacity, low vibration and noise, and low noise for models of various specifications.
江苏隆达机械设备有限公司
      ★The main parts are made of bearing steel and quenched (HRC58~62) to obtain high strength, and part of the transmission contact is made by rolling friction, so it is durable and long-lived.

  ★Because the main parts are made of bearing steel quenching treatment (HRC58-62), and then finely ground, and the cycloid teeth and needle gear set meshing transfer to the needle teeth to form a rolling friction payment, the friction coefficient is small, so that the meshing area without relative sliding, very small wear, so durable.

  ★ Reasonable design, easy maintenance, easy decomposition and installation, the number of parts needed less and simple lubrication, so that the cycloid reducer deep user trust.

  ★Compared with other reducers of the same power, the weight and volume are more than 1/3 smaller, and because of the planetary drive, the input and output shafts are on the same axis to obtain the smallest possible size.
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2022-07-16
2022 Annual
        On July 16, 2022, our company conducted a training on production safety for all employees, vigorously promoting the safety policy of "safety first, prevention first, comprehensive management", through the lecturer Yu Qingxin's in-depth and simple explanation, the students seriously learned the relevant knowledge, the students' safety concept, safety awareness, risk prevention ability and The main work of this training is summarized as follows.

        First, the importance of leadership and sound organization is the guarantee of the success of production safety knowledge training.
江苏隆达安全培训
        As an important part of the implementation of the spirit of our annual safety meeting and extensive learning activities, the production safety knowledge training is an important means to improve the quality of employees to ensure the achievement of safety goals. The company leadership attaches great importance to the training work, specifically in emphasizing the responsibilities of each department, and formulated a training program and specific implementation plan, and the company has negotiated and communicated with all departments, while requiring all departments to actively cooperate with the training work, supervising all departments and all employees to participate in the training, responsibility to the individual, the training process in strict accordance with the plan. With the support of the leadership and reasonable training plan as the basis, the whole training process, the staff responded positively and the training enthusiasm was high. In accordance with the company's training requirements, the lecturer carefully prepared the relevant lesson plans, the training took the form of a combination of centralized training and discussion, the staff training process and fire drills lasted half a day, the entire company administration on individual personnel due to special circumstances, the rest of the personnel without an absence, basically achieved a safety training rate of 95%, not found personnel halfway out of the field.
江苏隆达安全培训
        Second, the training content is real, diverse forms, highlighting the combination of safety awareness, safety risks and production reality, the training materials to the lecturer according to the company's requirements for the preparation of lesson plans, for the actual situation of the company, highlighting the company's production processes related to safety aspects of the content. At the same time collected and organized a large number of real classic cases and classic case videos as a supplement to the training content, to employees to analyze the causes of accidents, education and prevention, to improve the awareness and ability to prevent accidents, to reduce or eliminate accidents, to employees to instill advanced safety concepts, teaching the methods and strategies of fire prevention and life saving, etc.
江苏隆达安全培训
        Third, through this training and learning, employees have made great progress in the four aspects of safety concept, safety awareness, safety risk prevention and occupational responsibility, through the activities to strengthen the cohesion and centripetal force of the enterprise staff, improve the collective consciousness of the staff, and cultivate the spirit of dedication and love for the work of the staff.
江苏隆达安全培训及消防演练
         IV. Existing problems and suggestions
江苏隆达消防演练
         Although this training work has done a certain amount of work and made a lot of progress, there is still a gap from our company's goal. Summing up the past is to do a better job today and tomorrow. In this training work on production safety knowledge, the main problems exist as follows.

        1, the content of the training in the combination of theory and practice there is still a gap, more must strengthen the training of practical operation.

        2, individual participants are not active, the training time is short, the awareness of safety precautions is not high, the ideological understanding is not in place, the training content and training forms still need to be enriched.

         Safety production training work is a long-term, difficult task, related to the stable and healthy development of our company, a long way to go, we will persistently further improve this work in the future, so that safety production education and training work to a new level.


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2022-07-18
Use and maintenance of speed reducers during the break-in period
        After the reducer leaves the factory, it is generally stipulated that there is a break-in period of about 200 hours (over the time must be changed), which is stipulated by the technical characteristics of the initial use of reducer machinery. The break-in period is an important link to ensure the normal operation of the reducer, reduce the failure rate and extend its service life. However, some users, due to the lack of common sense reducer use or because the allowable torque is not enough, or want to gain revenue as soon as possible, small machine, and ignore the special technical requirements of the new machine break-in period.
        Some users even think that the manufacturer has a warranty period, the manufacturer is responsible for repairing the machine, so the reducer in the break-in period for a long time overload use, resulting in frequent reducer failure, which not only affects the normal use of the reducer, shorten the service life of the reducer. Therefore, the use and maintenance of the reducer break-in period should be given full attention.
First, the characteristics of the break-in period.
        1. Fast wear rate
         As a result of new reducer parts processing, assembly and commissioning and other factors, the mating surface contact area is small, and the allowable torque is large. Reducer in the process of operation, the concave and convex parts of the parts surface embedded friction, grinding down the metal debris, and as abrasive, continue to participate in the friction, more accelerated parts with the surface wear. Therefore, the wear period is easy to cause parts (especially with the surface) of the wear, wear speed is too fast. At this time, if overload operation, it may lead to damage to the parts, resulting in early failure.
        2. Poor lubrication
         As the newly assembled parts with a small clearance, and due to assembly and other reasons, the lubricant (grease) is not easy to form a uniform oil film on the friction surface to prevent wear. Thus reducing the lubrication efficiency, resulting in early abnormal wear of the machine parts. Seriously will cause precision with the friction surface scratching or galling phenomenon, resulting in failure.江苏隆达机械设备有限公司
        3. Loosening occurs
         New processing and assembly of parts, there is a geometric shape and fit size deviation, in the early stage of use, due to impact, vibration and other alternating loads, as well as the impact of heat, deformation and other factors, coupled with rapid wear and other reasons, easy to make the original fastened parts loose.
        4. Leakage phenomenon occurs
        Due to the loosening of parts, vibration and reducer heat, the sealing surface of the reducer and pipe joints, etc., leakage will occur; part of the casting and other defects, difficult to find during assembly and commissioning, but due to vibration and impact during operation, this defect is exposed, manifested as leakage (seepage) of oil. Therefore, leakage may occasionally occur during the break-in period.
        5. Many operating errors
        Due to the lack of understanding of the structure and performance of the reducer (especially new operators), it is easy to cause malfunctions due to operational errors, and even cause mechanical accidents and safety accidents.
        Second, the use and maintenance of the break-in period
        1. Special reducer, the operator should receive the manufacturer's training, guidance, the structure of the reducer, performance to fully understand, and to gain some experience in operation and maintenance before operating the reducer. The manufacturer provides the product use and maintenance manual, is the necessary information for the operator to operate the equipment, before operating the reducer, be sure to read the use and maintenance manual, according to the requirements of the manual for operation and maintenance. And keep the information for a long time to facilitate maintenance.
        2. Pay attention to the work load during the break-in period, the work load during the break-in period should not exceed 85% of the rated work load in general, and arrange a suitable workload to prevent the occurrence of overheating caused by the continuous operation of the reducer for a long time.
        3. Pay attention to frequent observation, abnormalities, should be promptly stopped to eliminate, in the cause is not found, before the fault is not removed, should stop the operation.
        4. Reasonable choice of lubricants, especially the input power of more than 11KW reducer shall be injected in the load gear oil. Pay attention to the frequent inspection of lubricating oil, hydraulic oil, coolant, oil level and quality, and pay attention to check the sealing of the whole machine. The reason should be analyzed if too much oil is missing during the inspection. At the same time, the lubrication of each lubrication point should be strengthened, and it is recommended that the lubrication point should be filled with grease every week during the break-in period (except for special requirements). Vertical reducer with oil pump when connected to the power supply pay attention to the direction of rotation of the oil pump, clockwise rotation is correct.
        5. In keeping the reducer clean, timely adjustment, tighten the loose parts to prevent loose and aggravate the wear of parts or lead to the loss of parts.
        6. At the end of the break-in period, the machine should be mandatory maintenance, good inspection and adjustment work, while paying attention to the replacement of oil.
         In short, the requirements for the use of reducer maintenance during the break-in period can be summarized as follows: strengthen training, reduce the load, pay attention to inspection, and strengthen lubrication. As long as we pay attention to and implement the maintenance and repair of the reducer during the break-in period as required, we will reduce the occurrence of early failures, prolong the service life, improve the production efficiency and make the reducer bring you more revenue.
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2022-07-20
Helical gear reducer common problems and their causes
1. reducer heat and oil leakage

  In order to improve efficiency, worm gear reducers generally use non-ferrous metal for worm wheel and harder steel for worm shaft. Because of the sliding friction transmission, the operation will generate more heat, so that the reducer parts and seals between the thermal expansion differences, thus forming a gap in the mating surface, lubricating oil liquid due to the rise in temperature becomes thin, easy to cause leakage. There are four main reasons for this situation, one is the unreasonable collocation of materials; two is the poor quality of the meshing friction surface; three is the incorrect selection of the amount of lubricant added; four is the poor assembly quality and use environment.

2. Worm wheel wear

  The worm wheel is generally made of tin bronze, and the paired worm material is hardened to HRC4555 with 45 steel, or 40Cr hardened to HRC5055 and ground to a roughness of Ra0.8μm by the worm grinder. the reducer wears slowly in normal operation, and some reducers can be used for more than 10 years. If the wear rate is faster, we should consider whether the selection is correct, whether the overload operation, and the worm gear material, assembly quality or use environment and other reasons.


江苏隆达机械设备有限公司


3. Drive small helical gear wear

  Generally occurs in the vertical installation of the reducer, mainly related to the amount of lubricant added and oil varieties. Vertical installation, it is easy to cause the amount of lubricating oil is not enough, when the reducer stops running, the transmission gear oil loss between the motor and reducer, gears do not get the proper lubrication protection. When the reducer starts, the gears are not effectively lubricated, resulting in mechanical wear and even damage.

4. Worm gear bearing damage

  Failure occurs, even if the gearbox is well sealed, or often found in the gear oil in the reducer is emulsified, bearing rust, corrosion, damage. This is because after running the reducer for a period of time, the gear oil temperature rises and the condensate generated after cooling mixed with water. Of course, also closely related to the quality of the bearing and assembly process.


        In the daily use of helical gear reducer we should focus on these four aspects of the problem, and do a good job of its maintenance and maintenance, in order to reasonably extend the service life of the reducer, decelerate the cost of production and operation of enterprises to obtain maximum profit.


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2022-07-21
The main maintenance of the reducer lies in the correct addition and replacement of oil
         A new reducer (gear reducer) the first refueling production after half a month of operation, the oil in the box will be released, refill the new oil to the middle line of the oil window. No oil window horizontally placed gear reducer refueling, the upper end of the reducer observation cover removed with the probe dipstick inserted vertically into the bottom of the box (probe dipstick vertical box bottom), the oil level height of 55mm-65mm; strictly prohibit the use of new and old oil mixture.

        Second, weekly inspection, monthly inspection of tilted gear reducer, the reducer will be removed from the upper end of the observation cover with the probe dipstick inserted vertically into the bottom of the box (probe dipstick vertical box bottom), No. 1 disk reducer oil level height of 285mm-300mm, No. 2 disk reducer oil level height of 215mm-225mm, No. 3 disk reducer oil level height of 195mm-205mm (that is, the oil level over the lowermost ball).
江苏隆达机械设备有限公司
        Third, the weekly inspection, monthly inspection reducer, observe the oil window so that the oil level is located in the middle line of the oil window position.

        Fourth, gear reducer, cycloidal reducer, worm gear reducer every six months with a new oil, summer with the summer oil, winter with the winter oil, oil change will be cleaned when the old oil, strictly prohibit the old and new oil mixed use.

        Before oil injection clean the reducer upper end cover impurities, refueling process is strictly prohibited foreign objects into the reducer box wear reducer gears, worm gear, reduce the life of the reducer, oil injection is completed clean the reducer upper end cover impurities and timely cover, the upper end cover and reducer combination with sealant filled to prevent oil leakage, the upper end cover under the gasket and tightly combined with the reducer.
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2022-07-22
Several reasons for oil leakage from speed reducers
         Lunda Xiaobian today to nag you about several reasons for oil leakage in reducer equipment.
        1. Too much oil: During the operation of the reducer, the oil sump will be stirred violently and the lubricant will be scattered on the whole machine.
        2. The structure design of the reducer is not reasonable.

        3. There is no oil return groove in the case, and the lubricating oil accumulates in the shaft seal, end cover, joint surface, etc. and leaks from the gap under the action of pressure difference; the inspection hole cover is too thin and easily deformed after tightening the bolt, resulting in uneven bonding surface and oil leakage from the contact gap.

摆线针轮减速机结构图

        4. During the manufacturing process of the reducer, the casting is not annealed or aged, and the internal parts are not removed. Inevitably, stresses and deformations lead to gaps and leaks.
        5. The shaft seal structure design is impractical. Early reducers mainly used oil groove and felt ring type shaft seal structure, and the felt was deformed by compression during assembly, and the gap between the sealing joint surfaces. If the contact between the journal and the seal is not ideal, the seal will fail quickly due to very low felt compensation. The oil tank has an oil return hole, but it is easily blocked and difficult to obtain oil return.
        6. Pressure difference between the inside and outside of the reducer: During the operation of the reducer, the temperature of the reducer rises due to the frictional heat of the motion pair and the ambient temperature. If there is no ventilation hole or the ventilation hole is blocked, the pressure inside the machine will gradually increase. The higher the temperature inside the machine, the higher the pressure difference with the outside world and the pressure difference will lead to lubrication through the gap. The oil may then leak.
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2022-07-08
The characteristics of gear reducer and the difference with other reducers
        The reducer is generally used for transmission equipment with low speed and high torque. High-speed electric motors, internal combustion engines or other power through the input shaft on the few gears and the output shaft on the large gear mesh reducer to achieve the purpose of deceleration. Ordinary human reducer also has several pairs of gears to achieve the desired deceleration effect by the same principle.
        Gear reducer is characterized by the fact that it can perform power shunt when transmitting power; meanwhile, its input shaft and output shaft have coaxiality, that is, output shaft and input shaft are set on the same main axis. Therefore, gear reducer transmission is now used to replace ordinary gear transmission, but as a speed increaser and variable speed device in various mechanical transmission systems.

The reducer is relatively large and can realize the synthesis and decomposition of motion. With the correct choice of gear transmission type and gear matching scheme, several gears can be used to obtain a large transmission ratio. The gear reducer transmission is only used to transmit motion, and its transmission ratio can reach several thousand It should be noted that when the transmission ratio is very large, the gear transmission can still maintain the advantages of compact structure, small mass and small size. In addition, it can realize the synthesis and decomposition of motion and realize complex motion with various speed changes.

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        The gear reducer is small in size, small in mass, compact in structure, and large in load capacity. Because the gear drive has power shunt, the center wheel forms coaxial drive, and the internal meshing gear pair is reasonably applied, the gear drive structure can be very compact. In addition, because multiple wheels are evenly distributed around the center wheel to share the load together, each gear is subjected to a smaller load and these gears allow for a smaller module size.
         In addition, the structure makes full use of the large load carrying capacity of the internal mesh and the allowable volume of the inner gear ring itself, which facilitates the reduction of the outer dimensions, resulting in a small size, low mass, very compact structure and large load carrying capacity. Generally speaking, the external size and mass of gear transmission is about 1/2 ~ 1/5 of that of ordinary gear transmission (i.e. under the same load conditions)

        Gear reducer transmission efficiency due to the symmetry of the gear transmission structure, i.e. it has several evenly distributed wheels, the reaction forces acting on the center wheel and the rotating arm bearing can balance each other, thus helping to improve the transmission efficiency. Under proper transmission mode selection and reasonable structural arrangement conditions, the efficiency can reach 0.97~0.99.


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2022-07-09
Precautions for the use of reducer lubricants
         Reducer lubrication is an important part of reducer maintenance, and there are certain points to note when we use lubricants on gear reducers. The following I will give you a rant, I hope to give you some help.
        1. For dilute oil centralized lubrication gearbox system, because the lubricant or oil tank temperature has more strict requirements, usually use the cooler (steam cooling) or cooling coil (water cooling) to make it cool. Although gear oil is required to have better anti-emulsification performance, it is very easy to emulsify the oil after a considerable amount of water is infiltrated into the oil. After emulsification of gear oil with extreme pressure anti-wear agent, the additive is separated by hydrolysis or precipitation and loses its original performance, and harmful substances are produced, so that gear oil deteriorates rapidly and loses its performance. Tieba lubricating oil engineers remind everyone that emulsified oil cannot be used continuously. For water (or steam) cooling lubrication system must pay attention to prevent water (steam) leakage, so as not to cause unnecessary damage to the reducer.

        2. For the reducer system using pump for circulation lubrication, pay attention to the differential pressure of the pump and timely cleaning of the screen. If the pressure difference of the pump is larger in a short time, or the frequency of cleaning the screen increases significantly, and the sludge and metal abrasive chips on the screen increase significantly, it means in a certain sense that the lubricating oil is not in good condition. In addition to the material and design problems, it can be said that the lubricant is not chosen reasonably enough: one is that the viscosity is not suitable enough, and the other is that heavy load can be used instead of medium load, that is, the gear oil of a higher grade is chosen, and the effect will be obviously better.

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        3. It is necessary to avoid the mixing of new oil poured into old oil (instead of making up oil according to regulations), or the practice of adding high-viscosity oil because the viscosity drops but in order to reach a certain viscosity. Doing so, there may be some short-term effect, but the use of oil performance will be significantly reduced, while making the equipment lubrication conditions worse, leading to increased wear, in a sense will shorten the service life of the equipment. In addition, may be different because of the main agent, when mixed with additives "fighting" thing, so that the additives should play a role in offsetting each other, the consequences for the equipment is unthinkable.
        4. On the issue of oil replacement cycle, theoretically speaking, the oil change period is short, can better reduce friction wear and extend the service life of the equipment, while providing a necessary condition to ensure its normal operation. However, from the perspective of economic efficiency, the oil should be used more accurately and effectively. Whether to change the oil, when to change the oil, in addition to follow the oil change period regulations, should also be based on the equipment start time, start rate and other factors to consider, so that the oil as much as possible to maximize the use.

        5. To regularly monitor the oil temperature, vibration, noise and other issues of oil-using equipment. Because of poor lubrication conditions caused by tooth surface damage, can directly lead to vibration and noise significantly strengthened.

        Reasonable and scientific maintenance and repair of the reducer can better extend the service life of the reducer and stable production operations.


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2022-07-11
Speed reducer lubricant performance characteristics
        1. Good anti-wear properties Anti-wear properties refer to the ability of reducer lubricants to form and maintain an oil film on the friction surface between moving parts to prevent mutual contact between metals and reduce wear. The anti-wear property of gearbox lubricant mainly depends on oiliness and extreme pressure (shear resistance). Oiliness refers to the ability of gear oils to adsorb to the friction surfaces of parts to form an oil film to reduce friction and wear. Usually we say that the oiliness of gear oil is good means that it has strong adsorption ability, which can improve the ability of anti-wear. Extreme pressure refers to the friction surface contact pressure is very high, the oil film is prone to rupture of the very high pressure lubrication conditions, to prevent sintering, gluing and other damage to the friction surface performance, also known as bearing capacity.
        2. Viscosity and viscosity-temperature reducer lubricant must have suitable viscosity and good viscosity-temperature. Generally speaking, the use of high viscosity lubricating oil is beneficial to prevent damage to machine parts and reduce noise, while transmission efficiency, cooling effect and oil transmission, etc., but low viscosity lubricating oil is better. For the viscous temperature performance, although the reducer lubricating oil is not as big as the engine oil temperature change, but because of its tooth surface pressure is very big, also requires good viscous temperature performance, especially in cold areas when using. Otherwise, it will cause increased wear and increased oil consumption.江苏隆达机械
        3. oxidation stability The lubricant of speed reducer is agitated by the movement of gears, and the constant contact with oxygen, and various oxides are formed under the catalytic effect of metal, so that the viscosity of lubricant increases, the color becomes darker, the acid value rises, the precipitate increases, the color becomes darker, and causes the corrosion of machine parts, resulting in the anti-foaming and anti-oxidation of lubricant becomes worse, so that the lubricant has to be replaced. The lubricant with good oxidation stability will have a long service life. Therefore, antioxidants are usually added to the lubricant to improve the oxidation stability.
         4. Rust and corrosion resistance Rust resistance refers to the performance of the gear oil to prevent rusting of metals. Corrosion resistance refers to the performance of gear oil to prevent metal corrosion. The rust of metal parts is mainly caused by the presence of oxygen and water in the lubricant. Corrosion, on the other hand, is caused by acids and sulfides in the oil. Usually, anti-rust additives and anti-corrosion additives are added to the lubricant of gearbox to improve it.
        5. Anti-foaming speed reducer lubricant will produce many small bubbles under the fierce agitation when the gear is in motion. If the small bubbles disappear quickly, it will not affect the use. If the stable bubbles no longer disappear and emulsification and deterioration occur, overflow will occur on the tooth surface, destroying the lubricant film and aggravating wear.
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2022-07-12
Helical gear reducer troubleshooting methods
        Helical gear reducer, is a novel reduction transmission device. Using the most optimal, modular combination system advanced design concept, with a small size, light weight, large transmission torque, smooth starting, transmission ratio grading fine and other properties. So what to do when the helical gear reducer fails? The following is a summary of a few troubleshooting methods for you.
Troubleshooting.
       Ensure the quality of assembly
       Can buy or homemade some special tools, disassembly and installation of reducer components, try to avoid knocking with other tools such as hammers; replacement gears, worm gear, try to use the original parts and pairs of replacement; assembly output shaft, pay attention to the tolerance fit; to use anti-adhesive or red Dan oil to protect the hollow shaft, to prevent wear and rust or fit area scale, difficult to disassemble when repair.
        Lubricant selection江苏隆达机械
        Helical gear - worm gear reducer generally use 220 # gear oil, for heavy load, start frequently, the use of poor environment reducer, can choose some lubricant additives, so that the reducer in stop running gear oil is still attached to the gear surface, the formation of protective film, to prevent heavy load, low speed, high torque and start direct contact between the metal. The additive contains seal adjuster and anti-leakage agent to keep the seal soft and flexible and effectively reduce the lubricant leakage.
        Installation position selection
        The location allows, as far as possible, not to use vertical installation. When installed vertically, the amount of lubricant added is much more than that of horizontal installation, which is likely to cause heat and oil leakage of the reducer.
        Lubrication maintenance
        According to the lubrication work "five" principle for the maintenance of reducer, so that each reducer are responsible for regular inspection, found that the temperature rise significantly, more than 40 ℃ or oil temperature more than 80 ℃, the quality of oil or oil found in the more copper powder and produce abnormal noise and other phenomena, to immediately stop using, timely maintenance, to Troubleshoot and replace the lubricant. When refueling, pay attention to the amount of oil to ensure that the reducer gets the correct lubrication.
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2022-07-13
Introduction to the operation and maintenance of speed reducers
        A speed reducer is a power transmission mechanism that uses a gear speed converter to reduce the number of revolutions of an electric motor (motor) to a desired number of revolutions to obtain a greater torque. Reduction gears have a very wide range of applications through the mechanisms currently used to transmit power and motion.
        Operating tips for speed reducers.
        1. Users should use the protection regulations reasonably, record carefully the operation of the reducer and the problems found in the inspection, and strictly implement the above regulations.
        2. When changing oil, wait for the reducer to cool down and then stop the machine to avoid the danger of incinerator, but still need to keep warm. When completely cooled, the viscosity of oil increases and it becomes difficult to increase the oil viscosity. Note: Turn off the transmission to prevent accidental energization.
        3. If the oil temperature exceeds 80°C or the oil pool temperature exceeds 100°C and abnormal noise occurs during operation, discontinue use. The reason is that the fault must be solved and the lubricant replaced before continuing operation.
        4. After 200-300 hours of operation, the first oil change should be performed. For future use, the oil should be checked regularly. The mixed impurities or deteriorated oil should be replaced in time. In general, the reducer running continuously for a long time should be replaced with new oil in 5000 hours or once a year, and the reducer not used for a long time should also be replaced with new oil first. The speed reducer must use the same oil as the original trademark and must not be mixed with oil of different trademarks. Oil with the same trademark but different viscosity can be mixed.
        Various types of machinery, from ships, automobiles, locomotives, heavy machinery for construction, processing machinery used in the machinery industry and automatic manufacturing equipment, can see the reducer. Its application extends to transmission. From high power to light load, reducer applications exhibit precise angular transmission, while in industrial applications, the reducer has the ability to slow down and increase torque. As a result, it is widely used as a speed and torque converter.
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2022-07-02
Cycloid reducer common failures and solutions
        Due to the long-term use of the reducer, there are often wear, leakage and other failures: 
        1. The main wear parts of the reducer gear shaft shaft diameter wear are the shaft head and keyway.
        2. Wear of drive bearing position.
        3. Bearing chamber wear.

        The traditional solution for the wear of cycloid reducer is to repair the weld or brush plating after machining, but both have disadvantages. The thermal stresses generated by the high temperature of the repair weld cannot be completely removed, and the easily damaged material causes the part to bend or fracture. Brush plating has a limited coating thickness and is prone to flaking. In addition, the two methods above are methods of using metal to repair metal. In the "hard-to-hard" adjustment-related action, it will cause secondary wear.

摆线针轮减速机

        Some large bearing companies cannot even achieve on-site solutions and have to resort to outsourced repairs. Modern Western countries began to use polymer composite materials to solve the wear problem, the advantage of the product has a unique compressive strength, super plastic deformation and super processing performance, in the processing of wear problems have been equipped and embodied. Due to its durability, free from dismantling and processing, it is not affected by non-repair welding thermal stress, and has no limitation on the thickness of the patch, as well as the flexibility to absorb shock and impact. Potential wear significantly extends the service life of equipment components and significantly saves valuable downtime. The company can solve the problem itself in the first instance.
        For leakage problems, oil leakage failures in cycloid gearboxes are usually more likely to occur in gearboxes, bearing boxes, threaded seals, mechanical seals, etc. Long-term, high-torque mechanical movements tend to increase the gearbox meshing gap. It may cause noise or vibration of the equipment. In addition, oil leakage often occurs due to the seal part operating at high speed and temperature for a long time. The traditional method of disassembling the gearbox, replacing the gasket and applying the sealing material takes time, and the sealing effect is difficult to guarantee, and leakage may occur again during operation.
        The modern general is to add new lubricant to the operation of the equipment to solve this problem. Super lubricant is an oil additive that does not contaminate or degrade the oil and can reach a shutdown to solve potential safety problems, and the company saves high maintenance and replacement costs. The lubricant has excellent self-lubricating properties, effectively reducing gaps in the engagement zone and reducing equipment noise and oil leaks in the sealing zone. Polymer materials can also be used in the field to deal with leaks, and their very good adhesion, oil resistance and 350 elongation allow them to overcome the effects of reducer vibration and solve reducer leakage problems.
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2022-07-04
Structure and installation of cycloid reducer
         Cycloid pinwheel reducer principle: a novel transmission device that adopts the principle of planetary gearing and uses cycloid pintooth meshing.
        All drives can be divided into three parts: input part, reduction part and output part. A double eccentric sleeve with 180° displacement is mounted on the input shaft, and two roller bearings called cycloidal arms are mounted on the eccentric sleeve to form the H mechanism. The center holes of the two cycloid needles are the upper cycloid bearings of the eccentric bushing. To reduce friction, in the low speed ratio reducer, the cycloid pin wheel engages a set of pin teeth arranged in rows on the pin gear, thus forming an internal meshing reduction mechanism with one tooth difference.)江苏隆达机械
        When the input shaft rotates one revolution with the eccentric sleeve, the motion of the cycloid gear becomes planar in both rotation and rotation due to the characteristics of the upper tooth shape of the cycloid gear and the restriction of the pin gear of the pin gear. When the input shaft rotates forward, the eccentric sleeve also rotates one revolution and the cycloid gear rotates one tooth in the opposite direction to decelerate, and the W output mechanism transmits the low-speed rotational motion of the cycloid gear to the output via a pin. shaft to reduce the output speed.

        How to install the cycloid reducer correctly?

摆线针轮减速机结构图

        Cycloid reducer structure diagram
        The general cycloid reducer is divided into flange type and special motor direct connection type. The general motor with flange is more convenient to separate and disassemble the motor and flange connection part directly, generally for the motor direct connection is no problem. Usually, the motor side from the output shaft side of the vertical ground, remove the oil seal, remove the end cover from the base, remove the swing parts, eccentric bearings and needle housing in turn. Usually, disassembly is not a problem, but special care must be taken when installing the cycloid reducer.
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2022-07-06
Brief description of Folding Leaf Mixer
Folded-lobe stirrer
    According to the physical properties of different media, capacity and mixing purpose, choose the corresponding mixer, which can play a great role in promoting chemical reaction speed and improving production efficiency. Folding leaf mixer is suitable for mixing pools in water supply and drainage projects, mixing of raw water and various chemicals in reaction pools and stirring of reflection process, stirring speed is generally 30-1400r/min. When stirring, it can make the material circulate in the reactor, the effect is mainly volume circulation, the shearing effect is small, and the up and down tumbling effect is good. When a larger flow rate is needed, the reactor is equipped with a flow guide cylinder.
Operation of Folding Leaf Stirrer
  According to the physical properties of different media, capacity and stirring purpose, choosing the corresponding stirrer can play a great role in promoting the speed of chemical reaction and improving production efficiency. The folding leaf turbine stirrer is generally adapted to the reaction of gas and liquid phase mixing, and the stirrer revolution should generally be selected above 300r/min.
Folding leaf stirrer material selection

  Agitator material selection according to the different use of different environment selection of different materials. The general use of weak acid, no corrosion of normal materials can choose stainless steel stirring. If there is a strong acidic material stirring to choose carbon steel epoxy, if the agitator has higher requirements for service life that is recommended to use carbon steel lined with rubber

The principle of folding leaf agitator
Centrifugal principle
  When the suspension containing fine particles is stationary, the suspended particles gradually sink due to the gravitational field. The heavier the particles, the faster they sink, and conversely, particles with a density smaller than that of the liquid will float. Particles in the gravitational field of the speed of movement and particle size, form and density, and with the strength of the gravitational field and the viscosity of the liquid. Particles the size of red blood cells, a few microns in diameter, can be observed in the usual gravitational effect of their sedimentation process.
  In addition, the material settling in the medium is accompanied by the phenomenon of diffusion. Diffusion is unconditional. Diffusion is inversely proportional to the mass of the substance, and the smaller the particle the more severe the diffusion. Settling is relative, conditional, to be subject to external forces in order to move. Settlement is proportional to the weight of the object, the larger the particle, the faster it settles. For particles smaller than a few microns, such as viruses or proteins, they become colloidal or semi-colloidal state in solution, it is impossible to observe the settling process using gravity alone. Because the smaller the particle the slower it settles, and the more severe the diffusion phenomenon. Therefore, it is necessary to use a centrifuge to generate a strong centrifugal force in order to force these particles to overcome diffusion and produce a settling motion.
  Centrifugation is the use of the powerful centrifugal force generated by the high speed rotation of the rotor of the centrifuge to accelerate the settling speed of the particles in the liquid and to separate the substances with different settling coefficients and buoyancy densities in the sample.
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2022-06-27
Brief description of the working principle of turbine mixer
       When it comes to turbine mixers, many of you are not very familiar with them. Do you also want to know more about the turbine mixer? Then don't go away, we immediately for all friends, for the introduction, we all together with the editor together to understand it.
1、Turbine mixer
       Turbine stirrer (also known as turbine impeller), is a widely used stirrer, can effectively complete almost all the stirring operations, and can handle a wide range of viscosity fluid. It consists of two to four flat or curved blades mounted on a horizontal disc. The ratio of outer diameter, width and height of the blades is generally 20:5:4, and the circumferential speed is generally 3~8m/s. The turbine causes highly turbulent radial flow when rotating, and is suitable for the dispersion of gases and insoluble liquids and liquid-liquid phase reaction processes.

2、Working principle

       When working, the turbine stirrer is like a centrifugal pump without a casing. The impeller rotating at high speed causes tangential and radial movement of the liquid in the kettle. The liquid flowing out at high speed along the impeller radius direction pushes the liquid in the kettle to the kettle wall, and then flows back to the entrance of the stirrer after encountering obstacles, forming two circuits respectively, thus forming a general circulation. The tangential velocity of the outflowing liquid will cause circular motion of the liquid in the kettle, which should be suppressed by measures. Compared with the propulsion stirrer, the circuit of the overall circular flow generated by this type of stirrer is more tortuous, and because of the higher exit velocity, the liquid near the blade end is more turbulent, resulting in a larger shear force.
      The turbine stirrer not only produces a large amount of liquid circulation, but also produces a strong shearing effect on the liquid near the outer edge of the paddle, and is commonly used in the reaction, mixing, heat transfer and dissolution of solids in liquid, suspension and gas dispersion of liquids with viscosity less than 50 Pa-s. However, for easy stratification of materials, such as suspensions containing heavy particles, such stirrers are not applicable.
3、Classification
     Turbine agitator is divided into disc turbine agitator and open turbine agitator; according to the impeller can also be divided into flat and straight leaves and inclined blade leaves.
     The content of the turbine stirrer is introduced here for your friends, is not a new understanding of the turbine stirrer, the above content from the network, please correct the deficiencies.
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2022-06-28
Knowledge about speed reducers
What is a speed reducer

       The reducer plays the role of matching the speed and transmitting torque between the prime mover and the working machine or actuator, and it is a relatively precise machine, the purpose of using it is to reduce the speed and increase the torque. According to the number of transmission stages can be divided into single-stage and multi-stage reducer; according to the shape of the tooth plant wheel can be divided into cylindrical gear reducer, bevel gear reducer and bevel-cylindrical tooth guide wheel reducer; according to the form of transmission arrangement can be divided into unfolded, shunt and the same into the shaft reducer. The reducer is an independent part consisting of gear drive, worm drive and gear-worm drive enclosed in a rigid shell, and is often used as a reducer between the prime mover and the working machine. It plays the role of matching speed and transmitting torque between the prime mover and the working machine or actuator, and is widely used in modern machinery.

        The reducer is generally used for low speed and high torque transmission equipment, the motor, internal combustion engine or other high-speed power through the input shaft of the reducer gears with fewer teeth meshed with the output shaft of the large gear to achieve the purpose of deceleration, ordinary reducer will also have several pairs of the same principle gears to achieve the desired deceleration effect, the ratio of the number of teeth of large and small gears, is the transmission ratio.

       Reducer is a relatively precise machinery, the purpose of using it is to reduce the speed and increase the torque. It has a wide variety of types and models, and different types have different uses. According to the transmission type, it can be divided into gear reducer, worm gear reducer and planetary gear reducer; according to the number of transmission stages can be divided into single-stage and multi-stage reducer; according to the shape of the gear can be divided into cylindrical gear reducer, bevel gear reducer and bevel-cylindrical gear reducer; according to the arrangement form of transmission can be divided into unfolded, shunt and coaxial type reducer.

Reducer composition structure

        The reducer is an independent transmission component used to reduce speed, transmit power and increase torque. Reducer is an independent closed transmission device between the prime mover and the working machine, used to reduce the speed and increase the torque to meet the work needs, in some occasions also used to increase the speed, known as speed increaser. The selection of reducer should be based on the working machine selection conditions, technical parameters, the performance of the power machine, economy and other factors, compare different types, varieties of reducer outline size, transmission efficiency, bearing capacity, quality, price, etc., choose the most suitable reducer. Reducer is a relatively precise machinery, the purpose of using it is to reduce the speed and increase the torque.

The basic structure of reducer is mainly composed of transmission parts (gear or worm), shaft, bearing, case and its accessories. Its basic structure has three major parts.

1、Gear, shaft and bearing combination
       Pinion and shaft made of one, called gear shaft, this structure is used for the diameter of the gear and shaft diameter is not related to the case, if the diameter of the shaft is d, the diameter of the gear tooth root circle is df, then when df-d ≤ 6 ~ 7mn, this structure should be used. And when df-d>6~7mn, the structure that gear and shaft are separated into two parts, such as low-speed shaft and large gear, is used. At this time, the gear and shaft circumferential fixed flat key connection, shaft parts using the shoulder, sleeve and bearing cover for axial fixation. Deep groove ball bearings are used for both shafts. This combination, used to bear radial load and not large axial load situation. When the axial load is large, angular contact ball bearings, tapered roller bearings or a combination structure of deep groove ball bearings and thrust bearings should be used. The bearings are lubricated by using the thin oil splashed up when the gears rotate. The lubricating oil in the oil pool in the box seat is splashed up to the inner wall of the box cover by the rotating gear, and flows along the inner wall to the bevel of the sub-box surface and then flows into the bearing through the oil guide groove. When the circumferential speed of oil-immersed gear υ≤2m/s, grease should be used to lubricate the bearing, and in order to avoid the possible splashing of thin oil to wash off the grease, the oil retaining ring can be used to separate it. In order to prevent the loss of lubricating oil and external dust from entering the box, sealing elements are equipped between the bearing end cover and the outstretched shaft.

2、Box body
       The box is an important component of the reducer. It is the base of the transmission parts, should have sufficient strength and rigidity.

The box is usually made of gray cast iron, for heavy load or impact load reducer can also use cast steel box. Single production of the reducer, in order to simplify the process and reduce costs, can be used to weld the box of steel plate.

        Gray cast iron has very good casting performance and vibration damping performance. In order to facilitate the installation and disassembly of the shaft system components, the box is made along the axis of the horizontal split type. The upper box cover and the lower box body are bolted together as one. Bearing seat coupling bolt should be as close as possible to the bearing seat hole, and bearing seat next to the tab, should have enough support surface, in order to place the coupling bolt, and to ensure that the wrench space required when tightening the bolt. In order to ensure that the box has sufficient rigidity, support ribs are added near the bearing holes. In order to ensure the stability of the reducer placed on the foundation and minimize the machined area of the box base plane, the box base generally does not use the complete plane.

3、Reducer accessories
        In order to ensure the normal operation of the reducer, in addition to the gear, shaft, bearing combination and the structural design of the box to give sufficient attention, should also take into account the reducer lubricating oil pool injection, oil drainage, check the height of the oil surface, processing and disassembly and maintenance of the box cover and box seat precise positioning, lifting and other auxiliary parts and components of reasonable selection and design.

       1) inspection holes for checking the engagement of transmission parts and injecting lubricant into the box, should be set in the appropriate location of the box inspection holes. The inspection hole is located at the top of the box cover where the gear meshing part can be directly observed. Normally, the inspection hole cover plate is fixed on the box cover with screws.

        2) ventilator reducer work, the temperature inside the box, gas expansion, pressure increases, in order to make the box of thermal expansion of air can be freely discharged, in order to maintain the pressure balance inside and outside the box, does not cause the lubricating oil along the sub-box surface or shaft extension seals and other gaps leakage, usually installed in the top of the box ventilator.

        3) bearing cover to fix the axial position of the shaft system components and bear the axial load, bearing seat hole ends with bearing cover closed. Bearing cover has flange type and embedded two kinds. Using hexagonal bolts fixed in the box, outreach shaft bearing cover is through-hole, which is equipped with sealing devices. The advantage of the flange type bearing cover is easy to disassemble and adjust the bearing, but compared with the embedded bearing cover, the number of parts is larger, the size is larger, and the appearance is not flat.
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         4) positioning pin to ensure that each time the box cover is disassembled, still maintain the accuracy of the bearing housing hole manufacturing and processing, should be in the finishing bearing hole before the box cover and box seat coupling flange with the positioning pin. Placed in the box longitudinal both sides of the joint flange, symmetrical box should be symmetrical arrangement, so as to avoid misassembly.

        5) oil surface indicator to check the height of the oil pool in the reducer, often keep the oil pool has the right amount of oil, generally in the box body for easy observation, the oil surface of the more stable parts, installed oil surface indicator.

        6) oil release screw plug for oil change, discharge of dirty oil and cleaning agent, should be in the bottom of the box seat, the lowest position of the oil pool to open the oil release hole, usually plug the oil release hole, oil release screw plug and the box body should be added between the joint surface of the gasket for leak prevention.

        7) open box screws to strengthen the sealing effect, usually in the assembly of the box body split surface coated with water glass or sealant, and therefore often difficult to open the cover when disassembled because of the tightly glued. For this reason, often in the appropriate location in the box cover coupling flange, processing ~ 2 screw holes, screwed into the cylindrical end of the box or flat end of the opening screw. Rotate the opening screw can be top box cover up. Small reducer can also not set the opening screw, open the cover with a screwdriver to pry open the cover, the size of the opening screw can be the same as the flange coupling bolt.

       Basic classification
       1, according to the use of reducer can be divided into two categories of general-purpose reducer and special reducer, the design, manufacture and use of the two different characteristics. 1970s-80s, the world reducer technology has developed a lot, and the development of new technology revolution closely integrated. Its main types: gear reducer; worm gear reducer; gear - worm reducer; planetary gear reducer.

       2, general reducers are helical gear reducer (including parallel shaft helical gear reducer, worm gear reducer, bevel gear reducer, etc.), planetary gear reducer, cycloid reducer, worm gear reducer, planetary friction type mechanical stepless speed changer, etc.

        1) Cylindrical Gear Reducer
        Single-stage, two-stage, two-stage above two-stage. Layout form: unfolding type, split type, coaxial type.
        2)Bevel gear reducer
        Used in the case where the input shaft and output shaft positions become intersecting.
        3)Worm gear reducer
        It is mainly used for the occasion of transmission ratio i>10, and the structure is compact when the transmission ratio is large. Its disadvantage is low efficiency. At present, Archimedes worm gear reducer is widely used.
        4)Gear-worm reducer
        Compact structure if the gear drive is in the high speed stage.
        If the worm drive is in the high speed stage, it has high efficiency.
        5)Planetary gear reducer
        High transmission efficiency, wide range of transmission ratio, transmission power 12w~50000kw, small volume and weight.
        
        3、The types of common reducers
        1)The main feature of worm gear reducer is that it has reverse self-locking function and can have a large reduction ratio, and the input shaft and output shaft are not on the same axis or in the same plane. However, it is generally larger in size, less efficient in transmission and less accurate.
        2) Harmonic transmission of harmonic reducer is the use of flexible components controlled elastic deformation to transmit motion and power, the volume is not large, high precision, but the disadvantage is that the life of the flexible wheel is limited, not impact resistant, rigidity is poor compared with metal parts. The input speed cannot be too high.
        3) Planetary reducer has the advantages of more compact structure, small return clearance, high precision, long service life, and rated output torque can be made very large. But the price is slightly expensive. Reducer:In short, the general power of the machine is designed and manufactured, its rated power is not changing, at this time, the greater the speed, the smaller the torque (or torque); the smaller the speed, the greater the torque.
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2022-06-30
Analysis of the characteristics and friction loss of gear reducers
        Gear reducer is a kind of speed reduction equipment commonly used in the market, named because of its use of gear transmission characteristics, gear reducer has the advantages of low energy consumption, low noise, high efficiency. Here let you ring gear reducer manufacturer Xiaobian explain the characteristics of gear reducer and friction loss analysis.

        Gear reducer is generally used for low-speed, high-torque transmission equipment. Ordinary motor reducer will also have multiple pairs of gears with the same principle to achieve the desired reduction effect. The ratio of the number of teeth of the large and small gears is the transmission ratio. With the continuous development of the gear reducer industry, more and more companies are applying gear reducers.

Gear Reducer
Characteristics of gear reducer.
       1, R series coaxial helical gear reducer combined with the international technical requirements of manufacturing, with a high technological content
       2, space-saving, reliable and durable, high overload capacity, power up to 132KW;
       3, low energy consumption, superior performance, reducer efficiency up to 95% or more;
       4、Low vibration, low noise, high energy saving;
       5、The use of high-quality forged steel materials, steel cast iron box, gear surface after high-frequency heat treatment;
       6, after precision machining to ensure shaft parallelism and positioning bearing requirements, the formation of helical gear transmission assembly of the reducer configured with a variety of classes of motors, combined into electromechanical integration, fully guarantee the quality characteristics of product use.
Analysis of friction loss of gear reducer.
        Gear reducer is a transmission equipment, which with the longer it works thus will increase the wear and tear of its internal transmission device. So what aspects should be analyzed from the gear reducer internal transmission wear problem? The loss of the gear unit (gear rack and reducer) in the gear reducer includes the following three aspects:
        1, the sliding friction loss between the teeth.
        2、Losses within the bearings, sliding bearings and rolling bearings.
        3. Losses from splashing and churning lubricants.
        The issue of loss within the 
gear reducer is related to the friction loss within the gearing, the friction loss in the rolling and sliding bearings, and the consumption and viscosity of the lubricant.
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2022-07-01
Basic knowledge of speed reducer installation and use
        Proper understanding, installation, use and maintenance of the reducer is an important part of ensuring proper machine operation. The reducer is mainly composed of transmission parts (gears or worm gears), shaft, bearings, case and accessories. Its basic structure has three major parts.

        1. Gear, shaft and bearing combination pinion and shaft made into one, called gear shaft, when the diameter of the gear has nothing to do with the diameter of the shaft, this structure can be used. The diameter is d, and the diameter of the gear tooth root circle is df. If df-d ≤ 6-7mn, this structure can be used. Similarly, in the case of df-d→ 6-7mn, a structure that divides the gear and shaft into two parts, such as a low-speed shaft and a large gear, should be used. In this case, the gear and shaft are connected by a fixed flat key, and the shaft part is fixed axially by the shoulder, sleeve and bearing cap. Deep groove ball bearings are used for both shafts.

        This gearbox combination is used to carry radial and, to a lesser extent, axial loads. If the axial load is large, a combination of angular contact ball bearings, tapered roller bearings, deep groove ball bearings and thrust bearings must be used. The bearings are lubricated by thin oil that is dispersed as the gear rotates. The lubricating oil in the oil sump of the box seat is dispersed by the rotating gear on the inner wall of the box cover, flows along the inner wall into the grooves on the surface of the box, and flows into the bearings through the oil guide grooves. If the circumference of the oil-immersed gear is less than 2 m/s, the bearings should be lubricated with grease. They can be separated using a retaining ring to prevent spilling of thin oil and to wash away the grease. A sealing element is installed between the bearing end cap and the extension shaft to prevent lubricant and external dust from entering the case.
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         2. The case is an important part of the reducer. It is the foundation of the transmission parts and must be strong enough.
Boxes are usually made of gray cast iron, cast steel boxes can also be used for reducers subjected to heavy or shock loads. Steel plate welded boxes can be used to simplify the process and reduce the cost of one-piece formed reducers.

         Gray cast iron has excellent casting and vibration damping properties. The box is divided horizontally along the shaft to facilitate installation and removal of the shaft system components. The upper case cover and lower case are bolted together. The attachment bolts on the bearing housing should be as close as possible to the holes in the housing, and the tabs next to the housing should have sufficient support surface to hold the attachment bolts and provide the necessary wrench space when tightening the bolts. Support ribs are added near the bearing holes to provide sufficient rigidity to the housing. To ensure stability of the reducer when placed on the foundation and to minimize the machined area of the box base plane, the box base is usually not used as a complete plane.

        When mounting the reducer, make sure that the motor and reducer are not damaged and that the dimensions of the motor and reducer parts match. There are motor positioning bosses, input shafts, gearbox recesses, etc. Dimensional and fit tolerances. Unscrew the screw on the dust hole on the outside of the reducer flange, adjust the snap ring on the PCS system so that the side holes align with the dust hole, then insert and tighten the hex. Then remove the motor shaft key.

        Reducer products are all very high efficiency, up to 96%, small vibration, I noise, excellent performance and good sealing. Can adapt to corrosion and moisture and other harsh environments.
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2022-07-05
How to adjust the use temperature of the mixer
      Reasonable adjustment of the use of the stirrer temperature can better ensure the operation of the equipment and the use of efficiency, in this regard, it is very critical to master the method of reasonable adjustment, the next on its method of introduction.
  When the equipment is used, it should be plugged into the power supply, place the vessel with the solution in the middle of the heating plate, and put the rotor into the solution of the vessel. Turn on the power, the light is on, then adjust the speed knob clockwise, the speed from slow to fast, adjust to the desired speed, the rotor rotates to drive the solution for stirring operation. When constant temperature heating is needed, insert the temperature measuring probe into the solution, and insert the plug into the back of the equipment and adjust the temperature knob to the desired temperature. If the accuracy of the solution temperature is required, a thermometer should be used to measure the solution temperature at the same time, and then adjust the temperature knob to reach the required temperature. If heating is not required, simply adjust the temperature knob to below room temperature.

  First of all, the stirrer that needs to adjust the temperature is divided into ordinary equipment and constant temperature equipment. For how to adjust the temperature, there are doubts generally for the constant temperature stirring equipment, in the use of constant temperature equipment must be noted in the use of the appropriate amount of water must be added before. Add the water must exceed the standard line, if the water level below the standard line of the phenomenon will lead to the internal piping of the equipment overheating temperature is too high and burned, resulting in damage to the equipment

  The next step we need to do is to turn on the power, and then select the temperature you want, and set at a constant temperature. Using the property of magnetic material is repulsive to each other, the magnetic stirrer is pushed to rotate by changing the ends of the base continuously, and the sample is driven to rotate by the rotation of the magnetic stirrer to make the sample evenly mixed! Then turn the switch of temperature to the setting state, and then mobilize the temperature control switch to adjust to the temperature you want. The number on the display next to the equipment is the temperature of the water tank (components: high water tank, storage tank, low water tank). At this time, if the red light is on inside the indicator, it shows that it is in the heating work, when we are finished heating the temperature control knob to a small value, and then cut off (cut off; cut off) power. Must pay attention to the sequence of issues, must cut off the power.
  Constant temperature equipment needs to pay attention to a few things is that if the water bath is not used for a longer period of time, the water tank (components: high water tank, storage tank, low water tank) in the water quickly excluded, scrubbed with a rag and dried clean. If there is remaining water inside is likely to have an impact on the data of the experiment after the equipment. And if there is no water in the case of the tank mixer is resolutely not to use, it is likely that the internal temperature is too high and no water to cool down the mixer internal burn.
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2022-06-20
Precautions should be taken when using the mixer and lubrication work
        When using a mixer, how do you lubricate it to optimize performance? If you have not carried out lubrication treatment before, you can see the method common to the mixer in the following article, and then know how to operate.
        1, a hydraulic Wen leg sigh 収起. Serves long time only use, should charm tires off placed well, with things will tire flange wrapped well, the body with sleepers or masonry pillar stable support. Traction should be removed and placed well.
        2, with 1 control valve to start the arm, raise the arm. Before opening the arm, check whether the wire rope is worn, broken and whether the rope card screw is tightened, whether the wire rope is in the sliding wheel groove.
        3、Raise the boom gently, do not operate too fast.
        4、If the hydraulic cylinder is not in place, check the hydraulic tank oil, if the amount is small, please inject hydraulic oil again.
        5、The clutch has been adjusted before leaving the factory, adjust again in use depending on the situation.
        6, often check the lubrication of various parts, according to the requirements of the lubrication table oil injection.
        7、Check the electrical wiring installation and connection, whether the grounding is solid, safe and reliable, and whether the power supply voltage meets the requirements.
        8, do a good job of cleaning, remove the body dust and oil. Each part of the bolt must not have loose and defective.
        9. Check the diagonal belt tightness, wire rope looseness, find the problem Nai time to adjust
        10. Before starting the pump, water must be made to fill the inlet pipe and pump cavity, and the motor is not allowed to proceed without water. Otherwise, the mechanical seal will be damaged.

        11, hydraulic pump is strictly prohibited to reverse, must be rotated in the direction of the arrow.

        12、The feeding hopper must be put down only after the big arm is raised.
        13、In the operation of the machine, attention should be paid to check whether there are abnormalities in each ministry, such as high temperature, abnormal impact sound, etc. The temperature rise of the oil pool of the gearbox should not exceed 35 degrees Celsius.
        14、After each work, must clean up the ash inside and outside the mixing cylinder. You can pour the right amount of stones and water into the mixing cylinder for mixing and cleaning, and finish the stones and water row in ~ ッv.
        15、After the shift, you must land the tipping bucket to the ground.
        16、Put the speaking hopper lever in the disengaged position after shift.
        17、The power must be cut off after the shift to prevent accidents.
        18、In case of freezing weather, the water supply system must be drained after shift.
Lubrication of the mixer
         The mixer is working in the environment with a lot of gray sand, in order to ensure the reliability of the machine work, reduce the wear and tear of machine parts and the loss of power. Lubrication work should be done in time.
         1, gears and bearings of the gearbox is the use of gear rotation to splash oil to the inner wall of the box, into the bearings to lubricate. The oil level of the gearbox should be kept between the two lines of the oil scale is appropriate. The oil level is too high or too low will cause the temperature of each ministry to rise or poor lubrication, increasing power loss and causing the machine to work poorly. The new machine began to use the first 150 hours and 300 hours to replace the oil once, in order to exclude the test run not completely clean dirt. When working, the oil level should be checked frequently, the shortage should be timely replenishment.
        2, where the exposed parts need to be adjusted and rotating with the position should always maintain the lubricant. But the brake belt part should not be stained with oil and water, so as not to affect the braking effect.
        3、The lubrication of the motor should be carried out according to the motor manual.
        4、Other lubrication position and lubrication period according to the lubrication system table.
These are the important parts of the lubrication process of the mixer. I want to know if there are any unclear questions after reading?

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2022-06-22
Failure analysis of agitator operation
      The agitator is composed of two major parts, namely the transmission device and the mixing device. The mixing device also consists of mixing blades, mixing shaft, shaft seal, frame, drive shaft and other major components. Here we focus on the common failures, causes and treatment methods of various gear reducers, cycloidal reducers, worm gear reducers and mechanical seals in the transmission device and its cycle protection system.
1. Reducer.
a. Strange sound when running
      Causes: rolling bearing damage, tapered roller bearing clearance is too large, gear or worm vice wear serious, pin tooth pin, sleeve, wheel wear.
b. Gear box or bearing temperature rises
      Reasons: Too much lubricating oil or too little lubricating oil, no oil or bad lubrication, bearing damage, tapered roller bearing clearance adjustment is too tight, the two coupling junction is not the same center, bearing bias grinding, lubricant deterioration, overload operation.
C. Shaft head or combination surface oil leakage

      Reason: Oil level is too high, sealing failure of the joint surface, loose joint surface compression bolts, oil seal damage.

d. Reducer amplitude is large
      Reason: The relative displacement of the two coupling joints is too large, there is looseness in the parts of the coupling, the bearing or other parts are damaged, overload use.
2. Mixing vessel
Large amplitude of stirring vessel
      Causes: Excessive relative displacement of the two shaft joints in the kettle or loose coupling bolts, offset of the bottom bearing and guide bearing center or bearing damage, imbalance of the stirrer body, liquid level in the kettle lower than the stirrer (especially the flexible shaft), bending of the stirring shaft.
3. Mechanical seal and its circulating protection system
Mechanical seal leakage is too large and humidity is too high
      Reasons: Axial stringing of the shaft exceeds the allowable value, radial displacement of the shaft at the shaft seal exceeds the allowable value, pressure in the seal cavity is lower than the pressure in the kettle, solid impurities in the seal liquid, serious wear of the seal surface, high temperature of the seal liquid exceeds the allowable value, damage of the O-ring at the dynamic and static ring, etc., liquid surface in the lubrication box of the single-end external seal is lower than the seal surface, verticality of the end face of the single-end external static ring and the stirring shaft is too poor.
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2022-06-23
Mixer classification and mixing power
The main types of agitators are as follows.
         ①Spinning paddle stirrer consists of 2~3 propeller blades with high working speed and the circumferential speed of the outer edge of the blades is generally 5~15m/s. The spinning paddle stirrer mainly causes axial liquid flow and generates large circulation volume, which is suitable for stirring low viscosity (<2Pa-s) liquids, emulsions and suspensions with less than 10% solid particles. The shaft of the stirrer can also be inserted horizontally or obliquely into the tank, where the circulation circuit of liquid flow is asymmetrical, which can increase turbulence and prevent liquid surface depression.
        ②Turbine type stirrer consists of 2~4 flat or curved blades installed on a horizontal disc. The ratio of outer diameter, width and height of the blades is generally 20:5:4, and the circumferential speed is generally 3~8m/s. The turbine causes highly turbulent radial flow when rotating, and is suitable for the dispersion of gas and insoluble liquid and liquid-liquid phase reaction process. The viscosity of the stirred liquid generally does not exceed 25 Pa-s.
        There are two types of paddle stirrers: flat paddle type and inclined paddle type. The flat paddle stirrer is composed of two flat and straight blades. The ratio of blade diameter to height is 4~10, the circumferential speed is 1.5~3m/s, and the radial liquid flow speed is small. The two blades of the inclined paddle mixer are turned 45° or 60° in opposite directions, thus producing axial liquid flow. The paddle stirrer has a simple structure and is often used for mixing low-viscosity liquids as well as dissolving and suspending solid particles.
        There is only a small gap between the outer edge of the paddle and the inner wall of the mixing tank, so that the viscous reaction products attached to the tank wall or the solids accumulated at the bottom of the tank can be removed and the heat transfer effect can be maintained. The circumferential speed of the outer edge of the paddle is 0.5~1.5m/s, which can be used for stirring Newtonian and plastic fluids with viscosity up to 200Pa-s (see viscous fluid flow). Only when stirring high viscosity liquid, there is a large stagnation zone in the liquid layer.
        ⑤ Spiral stirrer with the outer diameter of the spiral belt and the pitch equal, specifically for stirring high viscosity fluids (200~500Pa-s) and plasticized fluids, usually operating in the laminar flow state.
        ⑥Magnetic stirrer Corning digital heater with a closed circuit knob to monitor and adjust the stirring speed. The microprocessor automatically adjusts the motor power to suit water quality, viscous solutions and semi-solid solutions.
        The Corning digital heater stirrers have an optional external temperature controller (Cat. No. 6795PR), and they can also monitor and control the temperature in the vessel.
         The power P output of the stirrer to the liquid is calculated according to the following formula: P=Kd5N3pwhere K is the power quotient, which is a function of the stirring Reynolds number Rej (Rej = d2Nρ/μ); d and N are the stirrer's diameter
diameter and speed; ρ and μ are the density and viscosity of the mixture, respectively. For a certain geometry of the stirrer and stirring tank, the function of K and Rej can be determined experimentally, and the function is plotted as a curve, called the power curve. The type, size and speed of the stirrer have an effect on the distribution of the stirring power between the overall flow and turbulent pulsations. Generally speaking, the power distribution of turbine agitators is favorable for turbulent pulsations, while rotating paddle agitators are favorable for the overall flow. For the same type of agitator, under the same conditions of power consumption, large diameter, low speed agitator, the power is mainly consumed in the overall flow, which is beneficial to macro mixing. Small diameter, high speed stirrer, the power is mainly consumed in turbulent pulsation, which is beneficial to micro mixing. The scale-up of the stirrer is a complex issue related to the process, and so far can only be extrapolated to industrial scale through a step-by-step empirical scale-up, based on the obtained scale-up criteria.
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2022-06-24
Requirements for the operator of the mixer
  With the widespread use of mixers, in order to prevent equipment failure and danger, the correct method of operation is very important, in order to reduce human failure, which requires us to conduct a series of relevant training for operators, so that operators understand the operating standards of the equipment, then the specific standard requirements are as follows.
  Staff not only need to be licensed to work, and should have no less than one month of refresher training time each year, after the annual training and refresher training still need to accept the assessment, after passing the examination to continue to have a license qualification, this is to minimize personnel misuse, and mixing work more safely and reliably. A negligence in the mixer can directly cause an increase in production costs.
  Staff should be present during the operation of the mixer, on-site supervision and observation to ensure the normal operation of the machine, if the machine has abnormalities, should be the first to detect and deal with the corresponding, so as to have a more healthy and safe production effect.
  If the mixer needs to run for a long time, different operators need to hand over according to work hours, then a special operating manual should be prepared, filled out by the staff to effectively let the succession of personnel to understand the situation of the machine, so as to better deal with some sudden problems.
  In short, in the use of the mixer, we are still more stringent requirements for the operator, to avoid negligence because of personnel, thus causing a series of equipment failure, that is, affecting the use of equipment, but also threaten the safety of the operator's life. At the same time, we should always keep in mind that safety comes first.
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2022-06-29
Application of desulfurization agitator
      With the rapid development of the mixing industry, various types of agitators gradually into people's lives, desulfurization agitator as one of them, its as an environmentally friendly equipment, can effectively reduce the pollution of our environment by sulfur, in order to facilitate a better understanding of this equipment, the next to its detailed introduction.

  Which stirring requirements for dissolved oxygen is low, and now the domestic project more perforated tube aeration stirring. Also to ensure uniform air mixing, perforated tube more than arranged into a loop, aeration pipeline material can be selected according to the actual water quality, if the conditions allow the use of plastic pipe as far as possible, the reason is that the steel perforated pipe orifice is easy to oxidation rust. The shedding of oxidation and sediment deposition in the pipe is likely to cause blockage of the perforated pipe orifice. There are also environmental protection companies on the market to develop down-bending ring perforated pipe, the choice of ABS plastic pipe to make the entire pipeline, different pipe diameter perforated pipe and dry pipe using a special pipe reducer coupling connection; Japan developed porous aeration tube, the entire surface are distributed with microscopic pores, can be uniformly generated only micron size of the diameter of the bubble, so the oxygenation and mixing effect is very good. In addition, the stirring dispersion aeration is also a new technology in air mixing.

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  In the actual engineering application experience, generally in the desulfurization mixer design perforated tube aeration stirring, the required aeration is about 0.01 ~ 0.015 m3 / (min - m2), open aperture ≥ 5 mm, because the aperture is too small easy to block. The hole opening form generally uses the bottom both sides of 45 ° open hole. In addition, the perforated pipe length should not exceed 10 m; to ensure the effect of aeration and mixing, the perforated pipeline may not be evenly distributed; the perforated pipe diameter is as large as possible, and the friction of the pipe wall is as small as possible.
  Air mixing is generally set in the bottom of the pool perforated pipe, perforated pipe and blower air pipeline connected to the use of compressed air for aeration and mixing. Its main working principle is to use the air and the pool water contact, stirring the water body to prevent the suspended matter in the water body to sink, accelerate the transfer of oxygen in the air to the water body to complete the purpose of oxygenation.
  From this, we know that the specific application of desulfurization agitator, its equipment can be effectively adapted to a variety of different industries in the mixing work, so that it is fully mixed evenly to promote the efficiency of the use of substances.
搅拌器画册下载|减速机|挡板门|机械密封-江苏隆达机械设备有限公司https://www.longdaml.com
2022-06-13
The basic principles of mixing motor selection
        Usually, the motor model should be selected according to the mixing shaft power and the working environment around the mixing equipment, and the following basic principles should be followed
        ①Choose the motor type according to the load nature of the mixing equipment and the requirements of starting, braking, running and speed regulation of the motor under the process conditions.
        ②According to the requirements of load torque, speed change range and start frequency, consider the temperature rise limit, overload capacity and starting torque of the motor, reasonably select the motor capacity and determine the cooling and ventilation method. At the same time, the selected motor type and rated power should meet the requirements of increasing starting power when the mixing equipment is started.
        ③According to the environmental conditions of the place of use, such as temperature, humidity, dust, rain, gas and corrosion and flammable and explosive gases, consider the necessary protection methods and the structure type of the motor, and determine the explosion-proof level and protection level of the motor. In case of explosive and fire-hazardous environment, the structure type and corresponding level and group of explosion-proof motor should be selected according to GB50058 "Code for the Design of Electric Power Installations in Explosive and Fire-hazardous Environment": for gas or steam explosion-hazardous environment, the structure type and corresponding level and group of explosion-proof motor should be selected according to the partition level of explosion-hazardous environment and the level and group of gas or steam in the explosion-hazardous area and the use conditions of the motor; for dust For dust explosion hazardous environment, the structure type and corresponding explosion-proof and protection level of explosion-proof and protection motor are selected according to the zoning level of explosion hazardous environment and the usage conditions of motor; for fire hazardous environment, the structure type and corresponding protection level of protection motor are selected according to the zoning level of fire hazardous environment and the usage conditions of motor. In the chemically corrosive environment, the motor should be selected according to the classification of corrosive environment in accordance with CD90A6 "Technical Provisions on Electricity Design for Chemical Enterprises in Corrosive Environment".
搅拌器画册下载|减速机|挡板门|机械密封-江苏隆达机械设备有限公司https://www.longdaml.com


2022-06-15
The role of desulfurization agitator and commissioning
  Desulfurization agitator is a kind of equipment that mainly strengthens the slurry disturbance to prevent the slurry from settling, in which the turning of the desulfurization agitator, almost the same as the Shun pointer turning, but occasionally there will be uncertainty, mainly depends on the blade installation, in the blade rotation process, the agitator will be paddle to the oblique down to push the slurry, according to this judgment agitator rotation direction.

  Desulfurization agitator is used in many industries today, and it has more models and types. In view of the characteristics of domestic flue gas desulfurization, it absorbs the advanced technology of similar products at home and abroad, and through a lot of experiments and long-term practice, it has developed a new generation of top-in stirrer for desulfurization. The motor power range is 1.5-55kw.

  At the time of debugging if the agitator rotating in the wrong direction, so that the general current is significantly lower, the mixing effect is very poor; agitator blade is generally not installed against, some manufacturers equipment blade against the installation can not be installed, there are also agitator against can also be installed, the specific or according to the blade to distinguish. Agitator is strictly prohibited to idle, so the motor should be first test run, confirm the steering, and then agitator test run. When the absorption tower liquid level is higher than the stirrer to start the fixed value, you can test run. In the commissioning process, the stirrer test run, the liquid level is lower than the fixed value, when higher than (blade high position + blade length) can also be test run. Agitator test run is strictly prohibited idling (machine seal will be bad), forbidden liquid level is less than the fixed value, blade striking water vibration is very large. Agitator current and slurry concentration has a direct relationship, but the agitator and slurry pump is different, its current fluctuates greatly, general fluctuations 10A is normal.
  Desulfurization agitator is now often used as mixing equipment in the flue gas desulfurization device, because its reliability and life expectancy are very high, with high efficiency, long life, uniform mixing and easy maintenance characteristics, so that the desulfurization device can be safe and effective operation, but the use of different desulfurization agitator in different applications are not quite the same role, according to the specific situation specific analysis.

搅拌器画册下载|减速机|挡板门|机械密封-江苏隆达机械设备有限公司https://www.longdaml.com
2022-06-17
Knowledge of choosing stainless steel stirrer for reaction kettle
      Reactor with stainless steel stirrer a good selection method is best to have two conditions, one is the selection of reasonable results, one is the selection method is easy, but these two points are often difficult to have at the same time.
  As the viscosity of the liquid has a great impact on the state of stirring, so according to the size of the viscosity of the stirring medium to select is a basic method. Several typical stirrers have different ranges of use with high and low viscosity. The order of using various stirrers with increasing viscosity is propulsion type, turbine type, slurry type, anchor type and spiral type, etc. Here the propulsion type is divided into finer points, and low speed is proposed for large-capacity liquid and high speed for small-capacity liquid. This selection chart does not absolutely specify the limits of the use of pulp type, in fact, the use of a variety of pulp type is overlapping, for example, the pulp type because of its simple structure, with a baffle can improve the flow pattern, so it is also more commonly used in low viscosity. The turbine type is almost the most widely used slurry type due to its convective circulation ability, turbulent diffusion and shear force.
  The slurry type applicable to the process is judged according to the purpose of the mixing process and the flow state caused by the agitator, which is a more suitable method. Since the Soviet Union has its own customs in the selection of slurry type, it is not the same as our common slurry type.

  The recommended slurry type is divided into two categories: fast and slow, the former operating in the turbulent state and the latter in the laminar state. The selection is based on the purpose of mixing and the flow state to determine the slurry type and baffle conditions, the decision of the flow state to be influenced by the viscosity of the mixing medium.

  The conditions of use are more specific and include not only the slurry type and the purpose of mixing, but also the recommended range of medium viscosity, the range of mixing speed and the range of tank capacity.
  The proposed selection table is also based on the purpose of stirring and the flow state during stirring. It also has the advantage of dividing the use range of the slurry type according to the characteristics of different stirring processes, making the selection more specific. Comparing the above table, we can see that the selection basis and results are still relatively consistent. Here are some more descriptions of some of the main processes.
  The mixing of low-viscosity homogeneous liquids is one of the least difficult mixing processes, and is only difficult when the volume is large and the mixing time required is very short. The propulsion type is the most suitable because of its high circulation capacity and low power consumption. Turbine type because of its high power consumption, although there is a high shear capacity, but for this mixing process is not very necessary, so if used in the mixing of large-capacity liquids, its circulation capacity is not enough.
  Dispersion operation process, turbine type because of the high shear force and greater circulation capacity, so the most suitable, especially the shear force of the straight leaf turbine than the folded and curved leaves of the shear force effect, it is more appropriate. Propulsion type, pulp type because of its shear force than the flat turbine type is small, so only in the case of small amount of liquid dispersion available, and the pulp type is rarely used for dispersion operation. The dispersion operation has baffles to enhance the shearing effect.
  Solids suspension operation has the largest use of turbine type, of which the open turbine type is the best. It does not have the middle part of the disc, not to obstruct the liquid phase mixing above and below the paddle, and the advantages of the curved blade open turbine is more prominent, it is good discharge, the paddle is not easy to wear, so it is used for solids suspension operation more I suitable. The use of the propulsion type is narrower, the solid-liquid specific gravity difference is large or the solid-liquid ratio of 50% or more is not applicable. When using the baffle, attention should be paid to prevent the accumulation of solid particles on the corner of the baffle. Generally when the solid-liquid ratio is relatively low, the baffle plate is used, while the folding leaf opening turbine and propulsion type have axial flow, so they can also be used without baffle plate.
  The gas absorption process is most suitable for the disc type turbine, which has strong shearing force, and the bottom of the disc can store some gas, so that the gas is spread more smoothly, while the open turbine does not have this advantage. Pulp type and propulsion type are basically not suitable for gas absorption process, only in a small amount to absorb the gas required dispersion is not high when it can also be applied.
  Crystallization processes with agitation are difficult, especially when strict control of the crystallization size is required. Generally, fast stirring with small diameters, such as turbine type, is suitable for particle crystallization, while slow stirring with large diameters, such as slurry type, can be used for crystallization of large crystals.
搅拌器画册下载|减速机|挡板门|机械密封-江苏隆达机械设备有限公司https://www.longdaml.com
2022-06-21
What is a side-entry mixer (blender)

       There are many types of mixers (agitators), from the agitator installation position, there is a kind of agitator installed on the side wall of the equipment cylinder, which we usually call "side entry" agitator, the use rate of the side entry agitator is determined by the speed, in practice most of the side entry agitators use the axial flow design. The main advantage of the side-entry agitator is its low power consumption and low cost. Compared with the same material mixing, the power consumption of top-entry mixer is about 40~70%, and the cost is less than 35% of top-entry.

侧入式搅拌器-减速机|挡板门|机械密封-江苏隆达机械设备有限公司

       Most of the side-entry agitators are designed with low speed, 200~750r/min, and there are also designs with higher speed, 700~1400r/min. higher or lower speed can be designed to meet the actual needs, and the specific speed design needs to be considered based on the physical characteristics of the material, tank capacity, mixing purpose, etc. The specific speed design needs to be set according to the physical characteristics of the material, tank capacity, mixing purpose and other factors.
        The side entry mixer is widely used, especially for desulfurization, denitrification and various large tanks or tanks, which can work together with one or more units in practical application.
Side entry agitator is widely used in many industries, especially in refineries and oil depot bases where side entry agitators are installed on various tanks to agitate crude oil, asphalt, diesel, residual oil, fuel oil and other oil products. Its main purpose is to achieve blending. Heat transfer. Homogenization and prevention of sedimentation.

        In actual production, the agitator is non-standard equipment, mainly more material characteristics, tank size, and process needs and purposes to determine the size of the motor power, blade form, output speed, but also more chemical properties of the material to choose the material of the agitator, specific selection problems, welcome to call to consult, Jiangsu Longda Machinery Equipment Co.

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2022-03-29

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