What happens to the uneven feeding of the vibrating screen? Affect screening efficiency

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When using a vibrating screen to screen materials, we have repeatedly warned users and friends that the feeding should be uniform. Many users and friends may disagree, thinking that no matter what feeding method, the material will enter the equipment anyway, so we ignore the feeding problem. The idea is actually wrong. The uniformity of feeding has a great influence on the screening work of the vibrating screen. What happens to the uneven feeding of the vibrating screen? Next, the editor of Hiside will talk to everyone about the impact of uneven feeding.

The impact of uneven feeding of vibrating screen

Banana screen

1. Affect the service life of the screen

If the vibrating screen is fed unevenly, the screen will be damaged quickly and reduce the service life of the screen. Because if the feeding is uneven, there may be too much material at one time, which will exceed the working pressure that the screen can withstand, and the screen will also be weighed because of the weight of too much material, which will cause The screen surface is damaged faster.

2. Affect the output and accuracy

The uneven feeding of the vibrating screen will also affect the output and screening accuracy, which is also caused by the previous effect. Because the screen is damaged, the screen must be replaced, which in turn affects the output and screening accuracy. If this is the case for a long time, it will not only affect normal production but also increase equipment maintenance costs.

Another aspect that affects output and accuracy is reflected in the fact that when the feeding is uneven, there will be a phenomenon that there is material on one side of the screen surface and the other side is not. This will reduce the utilization rate of the overall screen surface and cause the output to fail to meet the requirements. . On the other hand, due to uneven feeding, it will be a problem of excessive accumulation of materials on one side. Once the accumulation of materials is too thick, it will affect the screening accuracy and output.

3. Affect the service life of the motor

When the vibrating screen is used, the uneven feeding or excessive feeding at one time in the production process will increase the load of the screen and the load of the motor, which will damage the vibrating motor and reduce the service life of the motor. Users are required to continuously maintain or replace the motors to increase equipment maintenance costs.

4. Affect the efficiency of screening

When using the vibrating screen, the uneven feeding will also affect the screening efficiency. If too much material is fed at a time, the screening load that the vibrating screen can bear will be exceeded, causing the material to be discharged from the discharge port before it has time to be screened, resulting in overfeeding. Too much fine material is discharged from the coarse material port, which will greatly reduce the screening efficiency.

The method of uniform feeding of vibrating screen

Arc vibrating screen

1. First, choose a reliable screen when choosing a vibrating screen.

2. Frequently check the tension of the screen surface and check whether the screen is compacted.

3. When there is strong impact force, a hopper or buffer can be added to the vibrating screen.

4. If there is material accumulation, find out the reason as soon as possible, such as adjusting the eccentric block of the vibration motor.

5. Carefully read the instruction manual of the ultrasonic vibrating screen, and feed the material strictly according to the processing capacity of the screen. If you need to increase the production capacity, you can find the vibrating screen manufacturer to further modify the screen machine.

6. The use of an automatic feeding system, that is, spiral feeding or bucket lifting, belts and other lifting and conveying devices for automatic feeding, not only solves the consequences of uneven feeding, but also improves the cost of the workshop.

The precautions of vibrating screen feeding

High frequency dehydration vibrating screen

1. Avoid too much feeding at one time

When feeding the vibrating screen, care should be taken to avoid excessive feeding at one time. A large amount of one-time feeding that exceeds the carrying capacity of the screen will cause the screen to become fatigued and loose, and severely damage the screen and affect the screening effect. When the vibrating screen is shipped from the factory, the vibrating motor and screen are matched according to user requirements. For example, one-time feeding will increase the load of the vibrating motor and reduce the life of the vibrating motor. The screening efficiency of the screen will also be greatly reduced.

2. Avoid large impact when feeding

Avoid large impact when feeding. This is also what the vibrating screen should pay attention to when feeding. The impact force of the one-time feeding will seriously affect the tension of the screen, and the loosening of the screen will affect the screening efficiency. Relatively, it will seriously affect the life of the screen plate. It is recommended to communicate clearly with the vibrating screen manufacturer when ordering a vibrating screen. A buffer hopper can be installed if the impact force of the feed is large.

The above is the answer about the uneven feeding of the vibrating screen. It can be seen that the uneven feeding will affect the service life of the vibrating screen, causing rapid damage to the screen, which in turn reduces the output and screening accuracy, and affects the service life of the motor. Affect the screening efficiency. These effects will increase the maintenance cost of the equipment, which is not conducive to stable production. Therefore, uniform feeding is very important. When feeding, it is necessary to avoid excessive investment or high impact at one time. If you need high-quality vibrating screen equipment such as banana vibrating screen and linear vibrating screen, please contact Hiside for detailed inquiry~

 

How to extend the service life of the vibrating screen?

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In the mining industry, the work task of the vibrating screen is still very important. It is necessary to screen the materials on the entire production line, and its processing capacity is large, and the screening effect is good. It is also indispensable screening equipment in many other industries. When we use vibrating screen equipment, of course we hope that the equipment can be used for a long time. This is also inseparable from the service life of the equipment, so how to extend the service life of the vibrating screen? Below, the vibrating screen manufacturer gave us the following specific introduction on how to extend the service life of the vibrating screen.

1. Install the vibrating screen correctly

The correct installation of the vibrating screen will help to extend the service life of the equipment. Before, we also specifically talked about how to install and debug the vibrating screen. One of the more important is the installation of the vibration motor. Heavier eccentric blocks are installed at both ends of the vibrating motor. During operation, we can control the excitation force by adjusting the number of eccentric blocks of the vibrating screen. However, due to the heavier eccentric blocks, such as vertical or inclined installation, The bearing has to bear the weight of the eccentric block in the axial direction, which will greatly affect the service life of the bearing. Therefore, when we do not require it, we generally recommend to choose a vertical vibration motor and try to avoid vertical or inclined installation.

2. Keep the vibrating screen stable

Maintain the stability of the vibrating screen equipment during use. Because the proportion of materials handled by the vibrating screen equipment is relatively large, and the work intensity is relatively high, various failure problems may occur during operation. If a failure problem occurs, it must be consuming the life of the vibrating screen. Therefore, the stability of the equipment must be maintained, which is also conducive to prolonging the service life.

Linear Vibrating Screen

3. Maintain the symmetrical balance of the eccentric block

When adjusting the eccentric blocks on both sides of the vibration motor, pay attention to the symmetry as much as possible, that is, the eccentric blocks at both ends should correspond to each other, or the connecting line of the eccentric blocks at both ends should be parallel to the axis of rotation and cannot be different planes. Otherwise, it is easy to make the vibrating screen unstable during operation, which may cause damage or burnout of the vibrating motor.

4. Dust the vibrating screen

Since the working environment of the vibrating screen is mostly harsh and dusty, if the vibrating screen equipment is operated in an open-air environment or in an environment where the protective cover is not tightly sealed, it is easy to get dust and cause the eccentric block to run by friction, thereby burning the motor. Therefore, in places where the working environment is harsh, firstly, increase the sealing of the protective cover, and secondly, frequently clean the dust inside the protective cover. This can also extend the service life of the vibrating screen.

5. Heat dissipation of the vibration motor

The bearing or main parts of the vibration motor are easily burned or burned when the temperature is too high under operation or abnormal operation. We can often vibrate the surface of the motor by vibrating the dust on the motor surface to make it work in good conditions. When working in a large environment, consider subtracting the heat dissipation ribs on the surface of the case. In addition, the equipment can be shut down to dissipate heat after operation.

Arc vibrating screen

6. The vibrating screen feeds uniformly

The vibrating screen is a continuous operation equipment, so the vibrating screen equipment needs continuous feeding. If you use too much during feeding, materials will accumulate on the vibrating screen, which will cause the vibrating screen to loosen and reduce fatigue. Due to the high screening efficiency, the equipment itself also increases the work load and damages the vibrating motor, so it is uniform Ground conveying vibrating screen is very important.

7. The material on the sieve surface is sieved cleanly

When the equipment stops production, the material on the screen surface should be sieved clean. After the production is completed, the screen surface materials should be completely screened before the shutdown is performed. This is because the residual materials in the screen surface and the screen body will corrode the linear screen frame and the screen and affect the service life.

8. Regular maintenance of the vibrating screen

Regular maintenance and maintenance of the vibrating screen is also very conducive to prolonging the service life of the vibrating screen. General maintenance is divided into weekly inspection, monthly inspection and annual inspection. The annual inspection is to overhaul the vibrating screen and disassemble the vibrating screen for cleaning. Maintenance also includes regular maintenance and daily maintenance. Regularly check whether the coarse mesh, fine mesh and spring are fatigued and damaged, and whether various parts of the fuselage are damaged due to vibration, and the parts that need to be lubricated must be lubricated.

High frequency dehydration vibrating screen

9. Choose high-quality vibrating screen

The quality of the vibrating screen directly determines the service life of the screen. Many people buy poor quality vibrating screens at increasingly cheaper prices. This is not conducive to production. It is also possible that some unconscionable manufacturers will install bad parts on other vibrating screen equipment and sell them at a low price. This will not only have a low equipment life, but also affect production and safety. There are great negative effects.

10. Handover work must be in place

The production of some enterprises is assembly line operation, and the screening machine works 24 hours a day. This requires the operator to make a record of the shift during the shift, record the output of the screening machine during use, the problems encountered during use and the solutions Wait. This can provide a good review for the next shift and targeted maintenance and observation.

The above is the answer to how to extend the service life of the vibrating screen. In general, there are correct installation of the vibrating screen, maintaining the stability of the vibrating screen, maintaining the symmetrical balance of the eccentric mass, and removing dust from the vibrating screen. The ten measures introduced can effectively extend the service life of the vibrating screen.

Application of Banana Vibrating Screen in Coal Preparation Plant

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Banana vibrating screen is a new type of vibrating screen applied to the screening and processing of large quantities of materials. It introduces its theoretical characteristics, development process, high efficiency and application effect in coal preparation plants. It is an ideal alternative to traditional inclined horizontal screens. , Is the development direction of vibrating screen in the future.

In the coal preparation industry, the vibrating screen is a widely used equipment for classification, dehydration, de-intermediation, and desliming. It is also a key screening equipment. The quality and efficiency of coal.

Banana screen

In order to improve production capacity and production efficiency, it is necessary to choose a high-performance vibrating screen to replace the traditional inclined horizontal screen. The banana vibrating screen, which is used in the screening and processing of large quantities of materials, is the choice.

Banana vibrating screen can be used for dry or wet sieving. So far, such screens have single-layer and double-layer structures. Compared with the traditional screen, the advantage of the banana vibrating screen is that it can handle a larger screening volume without taking up more space than other screening machines of the same size. For coal preparation plants that need to increase the sieve weight in the process of technological transformation, due to the constraints of site space conditions and unable to use larger sieves, the use of banana vibrating sieves can just solve this type of problem.

Arc vibrating screen

With the current major changes in coal washing technology and the booming coal market, a large number of coal preparation plants with backward production processes need to be transformed. How to install screening equipment with large processing capacity and high screening efficiency in existing plants is a key issue.

In the limited on-site space, the use of banana vibrating screens can successfully solve the problem of “cannot use larger screens but increase the screen weight”. It is a very good choice for screening equipment in the technical transformation of coal preparation plants. Moreover, the banana vibrating screen is undergoing further development in the washing industry, gradually extending to the application of desliming and media recovery.

Six main points teach you how to choose a vibrating screen

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Vibrating screen is an important screening equipment in mining equipment. After the material is screened by the vibrating screen, the specifications are clearer and the quality is higher, so its work efficiency affects the benefit of the entire production line. Therefore, it is also very important to choose a suitable vibrating machine, but some novice users may not know how to choose a vibrating screen. Below, the editor of Hiside will summarize a few selection points to teach you how to choose the right one.

Choose according to material characteristics

Each material that needs to be screened has its own unique properties, so choose a vibrating screen suitable for screening the material according to the different properties of the material. These attributes include: density, shape, temperature, viscosity, particle size, mobility, particle size distribution, corrosiveness, etc. According to your different materials, you need to choose different vibrating screens. If you are not sure about this, you can ask the manufacturer’s technicians to help you.

Arc vibrating screen

Choose according to the processing volume

1. When the required processing capacity is small, some light linear vibrating screens are cheaper and meet the demand; when the required processing capacity is large, a steel frame is required to ensure the quality. The steel frame of the mine linear vibrating screen can meet the requirements.

2. According to the size of the vibrating screen and the rated processing capacity, select a vibrating motor or a vibrating exciter of appropriate power.

3. Choose different sieve plate angles according to the nature of the material and the processing capacity requirements.

Choose according to the structure of the screen machine

When selecting a vibrating screen, the screen area and number of layers, the shape, size and area rate of the screen hole, as well as the motion mode of the vibrating screen, the vibration frequency and amplitude and other factors should also be considered when selecting the vibrating screen. The screening efficiency of the vibrating screen is related to the movement form of the screen surface, so the screening efficiency of the fixed screen is low, and the screening efficiency of the moving screen is relatively high. For the moving screen, the vibration of particles on the screen surface close to the vertical screen hole direction has a high vibration frequency and a better screening effect; if the particles slide in the direction of the screen surface, the screening effect is relatively poor.

Banana screen

Choose according to the purpose of screening

According to different screening purposes, different types of vibrating screens need to be selected, such as: materials need to be pre-screened, generally linear vibrating screens; for grading and screening of crushed materials, large-scale vibrating screens, probability screens, etc.; for materials For de-intermediation and dewatering, it is better to choose a dewatering vibrating screen.

According to the production site selection

According to the customer’s production site, choose the right size vibrating screen. Technicians need to measure the site on the spot and need to ensure that the linear vibrating screen can be placed in the production line. The more basic is the length, width, and height of the vibrating screen, and the measured values ​​must be accurate, otherwise the vibrating screen produced cannot be placed on the site. The vibration motor and exciter can be placed in different places (bottom or both sides) according to the actual site conditions. In this regard, we must choose a good manufacturer, because to ensure the power of Zhenyuan, Hiside Heavy Industry has rich experience and a large number of talents in the technical department, so it is worth choosing. The excitation force produced by bad manufacturers may not meet the amplitude requirements, which affects production. In addition to the length, width, and height, different shapes of inlet and outlet must be designed according to the production line, such as round and square.

Oother selection elements

1. Easy to repair. Try to choose a model that is easy to maintain under the same conditions. Mine vibrating screens are basically open-air operations, and the processed materials are all mineral materials. The harsh production environment is likely to cause large and small failures in the screen. The easy-to-repair screen can effectively save maintenance time and cost.

2. Parts. All parts and components of the selected models should be standardized and serialized. In this way, when replacing damaged parts, it can be directly replaced without modification and debugging.

3. Security. The selected mine vibrating screen model must ensure the safety of production. Safety in production is more important than Mount Tai, and you must not use unqualified models and accessories to save purchase costs or maintenance costs.

The above is an introduction on how to choose a vibrating screen. The vibrating screen is one of the indispensable equipment in the mining production line. The correct choice can help increase productivity. It can be selected according to the characteristics of the material, such as shape, particle size, density, etc.; Selection of processing capacity; selection according to the structure of the screen, such as screen area, number of layers, etc.; selection according to six aspects such as the selection of screening purposes.

What should I do if the vibration force of the linear vibrating screen is light? Causes and solutions

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The linear vibrating screen gets its name because the material’s motion trajectory is straight. It uses the exciting force as the source of vibration to throw up the material on the screen while the material moves forward in a straight line. After the material passes through the screen, the material is separated from the inlet. It is the oversieve and undersieve, which are then discharged from the discharge port respectively. The vibrating force of the vibrating screen is the source of throwing up the material, so it needs to have a certain vibration force, so what should I do if the vibrating force of the linear vibrating screen is light?

1. Reasons for the light vibration of the linear vibrating screen

High frequency dehydration vibrating screen

1. The power supply cannot operate normally

For the linear vibrating screen, the screen cleaning device is also the second power source to provide the vibrating force. Once the transducer is overheated or the power supply fails to operate normally, the vibrating force of the vibrating screen can be reduced. The inspection standard is that the normal temperature of the transducer is 60°C during operation. If the temperature is found to be abnormal, it should be shut down for maintenance, mainly due to material residues. Therefore, the contact part of the transducer and the screen should be cleaned before the screen is operated.

2. Vibration motor failure

The vibrating motor is the main power source of the vibrating screen. Once the motor fails, the vibration force will decrease. So what are the problems with the motor? The lack of oil in the motor will affect its operation, and once the lubricating oil consumption is severe, the friction of the motor components will increase and the vibration force will be reduced. Therefore, it is necessary to check the fuel consumption of the motor regularly, and immediately stop and add lubricating oil once it is found.

3. Design and production issues

At the beginning of the design of the vibrating screen, if there is no detailed communication, and the model is selected without understanding the characteristics of the material and the required output, the vibrating screen designed and produced will easily appear inconsistent with the requirements, and the vibration force will be too light and fail to meet the production requirements. The problem. Therefore, when we purchase vibrating screening equipment, we should also provide detailed material characteristics and required output, so that the vibrating screen manufacturer can also suggest suitable models for you according to the detailed parameters.

Second, the solution to the light vibration of the linear vibrating screen

1. Adjust the exciting force

First, adjust the excitation force to adjust the angle of the eccentric block. There are eccentric blocks at both ends of the motor, and this eccentric block has a certain angle. The excitation is different for different angles. The angle is smaller, the excitation force is smaller, and the angle is larger. , The excitation force is larger, at this time, you can adjust the angle of the eccentric block according to your own needs, and you can also change the movement trajectory and residence time of the material on the screen. In order to adapt the screening machine to the required separation state of various materials, such as various changes in the distribution of materials, output per hour, screening efficiency, penetration rate, etc., the angle of the eccentric block is adjusted to the ideal state.

2. Adjust the angle and gauge

To adjust the angle of the vibrating screen, you need to open the adjustment hole of the bottom barrel. Loosen the fixing bolts of the lower eccentric block. Screen the material trajectory according to the required. Adjust the phase angle of the upper and lower weights in the opposite direction of the discharge port. Then put a small amount of material on the screen surface, make the screen machine run, and check the movement trajectory of the screen surface material. If the processing parameters have reached the effect, stop the machine and tighten the fixing bolts, and the adjustment is over.

3. Adjust the weight of the eccentric block

The weight adjustment of the eccentric block can be equipped with additional weights on the upper and lower weights. The main function is to increase the exciting force output by the screen machine. According to the number of layers of the screen machine and the specific gravity of the material to increase or decrease the exciting force, increase or decrease the additional weight. Then test the machine to observe the weight, and wait until the screening machine reaches the screening effect. Sometimes due to the influence of the specific gravity of the material, the humidity, the tilt angle and other parameters, it is impossible to adjust the stagger angle one-time successfully, so Users are requested to have sufficient patience to make adjustments so that the screen machine can play its due efficiency.

3. Measures to prevent the vibration of the linear vibrating screen from being light

1. Feeding at a constant speed

When using the vibrating screen, some users find that there are a lot of objects on the screen and they feel that the machine can’t move. At this time, the reason is that there are more materials. When the material can be fed, the material is fed at a constant speed, so that the material is at a relatively uniform speed when the material is unloaded. Will not press the machine to reduce the exciting force.

The exciting force of the vibrating screen itself originates from the vibrating motor itself, so at the moment of its operation, the motor itself will have a high temperature rise, and it is precisely because of the existence of this cooperation gap that the shaft of the vibrating motor will expand after the temperature rises. The shaft after expansion happens to work closely with the bearing, and the rod reaches the normal operating condition. If it is not maintained, the excitation force may not be reached. Therefore, the motor needs to be maintained and maintained regularly.

The above is the answer to what to do if the vibration force of the linear vibrating screen is light. First of all, we must know that the reason for the light vibration force may be caused by the power supply failure, motor failure and design and production problems. Secondly, we want to solve this problem. It can be solved by adjusting the excitation force, the angle gauge, and the weight of the eccentric block. If you want to prevent it, you need to maintain the motor and feed evenly.

Summary of common problems and solutions for coal centrifuges

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Coal centrifuge is a machine that uses centrifugal force to separate liquid and solid particles or each component in a mixture of liquid and liquid. It is mainly used to separate the solid particles in the suspension from the liquid; or to separate the two incompatible liquid substances in the emulsion with different densities; it can also be used to remove the wet solid For liquids, special ultra-velocity tube separators can also separate gas mixtures of different densities; taking advantage of the different settling speeds of solid particles of different densities or particle sizes in liquids, some sedimentation centrifuges can also determine the density or size of solid particles. To classify. So in the process of use, how to maintain the coal centrifuge? Let us follow the coal centrifuge manufacturers to learn more about it!

Common problems of coal centrifuge

Reasons for the power supply and the motor not running:

1. The power cord is disconnected internally, and the plug and socket are in poor contact.

2. The speed regulator switch is out of order, the power supply is not turned on, or the connection wire is disconnected.

3. The brush is open, and the brush is stuck or severely worn out of contact with the commutator.

Maintenance method:

1. Check the power lead and replace the plug and socket with poor contact.

2. Open the bottom cover, check the speed regulator with a universal meter, repair the open circuit, and replace damaged parts, such as worn-out brushes.

 Reasons for the motor not reaching the rated speed:

1. The power supply voltage is too low, and the speed is obviously slowed down when the power supply voltage is below 190V.

2. The bearing is damaged and the rotation is not flexible, or the bearing is lack of oil and dirt, which causes the bearing to heat up and increase the friction resistance.

3. Poor contact between the two brushes.

Clean Coal Centrifuge

Maintenance method:

1. Find out the reason for the low power supply voltage, adjust the voltage to 220v with a power supply regulator, and when the voltage reaches normal, polish the rectifier with sandpaper to make the brush and the rectifier have good contact.

2. When the bearing is short of oil or dirty, it should be cleaned first and then refueled. It is acceptable to add butter or petroleum jelly. The lubrication amount is 1/3~3/2 of the bearing clearance. If the bearing is damaged, replace the bearing.

The vibration is large when rotating, the centrifuge jitters back and forth, and the noise is large. The causes:

1. The bearing or bearing sleeve on the motor is severely worn.

2. The upper end of the motor is mainly bent.

3. The load is unbalanced, the two test tubes are asymmetrical, the weight of the sleeve is different, there are more broken glass in the sleeve, and the centrifuge tube sleeve does not meet the requirements.

4. The rotor of the motor is not in the center of the magnetic field, that is, the space around it is inconsistent or the outer cover is deformed in the wrong position, friction and noise will occur.

5. The motor and the bottom screw are loose, the shaft is not vertical, and the machine feet are not flat.

6. The centrifuge fixing screws with damping springs are loose or the springs are broken.

Maintenance method:

1. Replace with new bearings or sleeves.

2. Remove the main shaft for straightening or replace the main shaft.

3. The test tube and the casing must be balanced and weighed at the same time. High-speed centrifugal balance is more important. The centrifuge tube sleeve cannot be changed at will.

Slime Centrifuge

Reasons for long-term shutdown or low-speed startup in cold weather:

1. Lubricant solidification.

2. Lubricating oil deteriorates and sticks.

Maintenance method:

1. After power on, it can be started with manual help, and it will return to normal after running at high speed for a period of time.
2. Clean the bearing and re-oil it.

Causes of damp and leakage:

1. The centrifuge is useless for a long time, the indoor humidity is high, and the moisture is eroded.

2. Insulation between the live part of the centrifuge and the casing of the machine is not good or the insulation performance of the insulator decreases after being damp.

Maintenance method:

1. The centrifuge that has not been used for a long time should be kept dry. Generally, it should be energized at least once a month and rotated for 15 minutes. If moisture is found, it can be rotated continuously for 2 hours to drive off the moisture in the machine.

2. When the cabinet is leaking, the contact point between the live wire and the cabinet should be found and replaced with a new one. The case must have a good grounding wire.

How does the vibrating screen work?

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Vibrating screens have been widely used in mining, metallurgy, coal, water conservancy, transportation, and chemical industries to complete various processes, such as screening, grading, washing, de-intermediation and dehydration of materials . As an intermediate link between mining and smelting, mineral processing efficiency not only directly affects mineral processing productivity, but also has a profound impact on the rational use of national resources.

The vibrating screen works by using the double-rotation vibration generated by the vibrator. The upper rotating weight of the vibrator makes the screen surface vibrate in plane, while the lower rotating weight makes the screen surface vibrate the cone surface. Its combined effect The effect is that the screen surface produces double-rotating vibration. Its vibration trajectory is a complicated spatial curve. The curve is projected as a circle on the horizontal plane, and projected as an ellipse on the vertical plane. The amplitude can be changed by adjusting the excitation force of the upper and lower rotating weights. Adjusting the spatial phase angle of the upper and lower weights can change the curve shape of the screen surface movement trajectory and change the movement trajectory of the material on the screen surface.

High frequency dehydration vibrating screen

Vibrating screen equipment can be divided into: mining vibrating screen, light fine vibrating screen, and experimental vibrating screen according to its weight.

Mine vibrating screens can be divided into: heavy-duty screens, self-centering vibrating screens, elliptical vibrating screens, dewatering screens, circular vibrating screens, banana screens, linear vibrating screens, etc.;

Light fine vibrating screen can be divided into: rotary vibrating screen, linear screen, straight row screen, ultrasonic vibrating screen, filter screen, etc.;

Experimental vibrating screen: flapping screen, top-strike vibrating screen, standard inspection screen, electric vibrating screen, etc.

According to the material running track of the vibrating screen, it can be divided into:

According to the linear motion trajectory: linear vibrating screen (the material moves forward on the screen surface in a straight line);

According to the circular motion trajectory: circular vibrating screen (materials move circularly on the screen surface);

According to the reciprocating motion trajectory: fine screening machine (materials reciprocate forward on the drying surface).

Arc vibrating screen

In recent years, although vibrating screening machinery has achieved unprecedented development, the theoretical framework of vibrating screens has been stable and becoming mature. Various types of vibrating screens have been introduced one after another, but vibrating screens with high screening efficiency and large output have always been vibrating. The new direction of sieve research and development.

The coal or ore mined in the mining field, or the crushed material, before the material is used or further processed, it needs to be divided into several grades of similar particle size or be dehydrated, de-intermediated, de-slimed, and sometimes a combination of several items. Yes. When performing the above work, there is always the problem of grading materials through the holes of the screen surface, and the grading of materials through the holes of the screen surface is called sieving. Through the research on the screening process of materials, it is found that the screening of materials can be divided into two stages:

1. Fine-grained materials smaller than the mesh size reach the screen surface through the material layer composed of coarse-grained materials;

2. The fine particle material passes through the sieve holes on the sieve surface to complete the sieve.

When the vibrating screen is working, the two motors synchronously and reversely rotate to make the exciter produce a reverse excitation force, forcing the screen body to drive the screen to move longitudinally, so that the material on it is periodically thrown forward for a range due to the excitation force. So as to complete the material screening operation. It is suitable for screening sand and gravel materials in quarries, and can also be used for product classification in coal preparation, mineral processing, building materials, electric power and chemical industries.

The working part of the vibrating screen is fixed, and the material is screened by sliding along the working surface. Fixed grid sieve is one of the most widely used in concentrators, generally used for pre-screening before coarse crushing or medium crushing. It has a simple structure and is convenient to manufacture. It does not consume power and can directly unload the ore onto the screen surface. The main disadvantages are low productivity and low screening efficiency, generally only 50-60%. The working surface of the vibrating screen is composed of horizontally arranged rolling shafts. There are plates on the shafts, and fine-grained materials pass through the gaps between the rollers or plates.

In order to smoothly complete the screening process of the material, the condition of relative movement between the material and the screen surface must be satisfied. Therefore, the screen box of the vibrating screen should have suitable movement characteristics, on the one hand, it can make the material on the screen surface become loose.

On the other hand, it can make the coarse particles blocked on the sieve holes escape, and keep the fine-grained materials smoothly through the sieve. In the actual production process, the actual screening process is: “After a large number of broken materials with different particle sizes and mixed coarse and fine particles enter the screen surface, only a part of the material contacts the screen surface. In this part of the material contacting the screen surface, It is not entirely a fine particle material smaller than the mesh size,
Most of the remaining fine particles smaller than the mesh size are distributed throughout the entire material layer.

Through the movement of the screen box, the material layer on the screen surface is loosened, so that the gap that exists between the large particles is further expanded, and the small particles take the opportunity to pass through the gap and transfer to the lower layer; at the same time, due to the small particles between the materials The gap is small, and large particles cannot pass through. Therefore, the position of large particles increases continuously during the movement. As a result, the original messy material particle group separates, that is, it is layered according to the particle size, forming an arrangement rule with small particles on the bottom and coarse particles on the top.

The fine particle material that reaches the screen surface, because its size is smaller than the sieve hole size, can smoothly penetrate the screen, and finally realize the separation of coarse and fine particle materials and complete the screening process.” However, sufficient separation is impossible. In time-sharing, there is generally a part of the fine particles remaining in the coarse particles on the sieve and cannot penetrate the sieve. Research shows that although the size of the fine particles is smaller than the sieve hole, the difficulty of their penetration is not the same. Compared with sieve holes, the smaller the particle size, the easier it is to penetrate the sieve, and vice versa, the more difficult it is.

How to disassemble the bearing of the vibrating screen

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In the production process of the coal industry, crushing equipment is first needed to crush the materials, and then the crushed materials are screened. The vibrating screen is here to undertake the screening task. In the vibrating screen equipment, the bearing is the key component of the equipment. Generally, heavy-duty bearings are selected to facilitate carrying a certain axial load. The working load of the bearing is very large, the speed is high, the temperature is high, and it is accompanied by strong vibration and shock. After time, the bearing needs to be replaced. Replacing the bearings also includes disassembly and installation, so how to disassemble and install the vibrating screen’s bearings? Now, the editor of Hiside will introduce it.

1. Disassembly steps of vibrating screen bearing

①Disassembly of outer ring bearing

Disassemble the outer ring with interference fit, set several screws for extruding the outer ring on the circumference of the shell in advance, tighten the screws evenly while disassembling. These screw holes are usually covered with blind plugs, vibrating screen tapered roller bearings, etc. Separate bearing, set several cuts on the shoulder of the shell, use a spacer, disassemble it with a press, or tap it to disassemble it.

Linear Vibrating Screen

②Disassembly of inner ring bearing

The bearing of the inner ring is generally a cylindrical bore bearing, and this kind of bearing is disassembled to be pulled out by a press machine. At this time, pay attention to let the inner ring bear its pulling force. The inner ring of the large-scale vibrating screen bearing is disassembled by oil pressure. Oil pressure is applied through the oil hole provided on the shaft to make it easy to draw. For bearings with a large width, the hydraulic method and the drawing fixture are used together for disassembly operations. The inner ring of the cylindrical roller vibrating screen bearing can be disassembled by the induction heating method. It is a method to heat the part in a short time to expand the inner ring and then pull it out.

③Disassembly of small bearings

Disassemble the relatively small bearing with adapter sleeve, support the inner ring with the stopper fastened on the shaft, turn the nut back several times, and then use the cushion block and hammer to knock to complete the disassembly.

2. Installation steps of vibrating screen bearing

When replacing a new bearing for a mine vibrating screen, the same bearing as the original model must be used.
①Wash the bearing with kerosene, press it into the bearing seat, fill the ball of the outer ring of the bearing with No. 3 lithium base grease to two-thirds full, apply it evenly with clean hands, install the bearing gland, and use coated bolts to prevent loosening Adhesive fastening bolts compress the bearing gland;
②The bearing is a cylindrical roller bearing with a separable inner and outer sleeve. The inner sleeve of the bearing should be placed on the shaft and in place;
③ Install the bearing seat on the casing. If there is a grease filling hole, it must be aligned with the position. Tighten the bearing seat with fastening bolts coated with bolt anti-loosening glue;
④ Install the inner and outer eccentric block on the shaft and place it in place. If there is a shaft key, install the shaft key in the keyway and then install the outer eccentric block, and install the shaft retaining ring on the shaft;
⑤ Tighten the fastening bolts of the eccentric block, turn the adjustable eccentric block to the angular position before removal and tighten the fastening bolts. After the above assembly is completed, the rotating shaft should have a certain axial movement;
⑥Put on the protective covers at both ends and fasten them with screws.

3. Precautions for disassembly and assembly of vibrating screen bearings

①When disassembling the bearing, pay attention to the removal of the protective cover at both ends, and record the percentage value of the excitation force when the eccentric block is working, so that it can be restored to the original working state during installation.
② Remove the shafts at the two shaft ends with retaining rings.
③Remove the bearing seat compression bolts, screw into the bearing seat removal screw holes with appropriate bolts, and eject the bearing seat from the housing;
④Remove the bearing gland from the bearing seat, and press out the bearing from the bearing seat or push it out with a suitable bolt;
⑤If the bearing is a cylindrical roller bearing with a separable inner and outer sleeve, remove the inner sleeve of the bearing from the shaft and put it into the original bearing outer sleeve;
⑥ After the bearing is disassembled, pay attention to clean the oil stains of all parts. After disassembling the vibrating screen bearing, we need to replace it with a new bearing. Below we will talk about the installation steps of the bearing;
⑦The shaft of the bearing must be properly supported, otherwise the disassembly force is likely to damage the bearing.

The above is the answer on how to disassemble and install the bearing of the vibrating screen. We must follow the correct steps during the disassembly and assembly process, otherwise it may cause internal damage to the bearing, so you need to be careful regardless of disassembly or installation. Hiside Heavy Industries focuses on the manufacture of vibrating screen equipment. The products are high in strength. They are riveted with HUCK bolts, without any welds, and have low power consumption. If you need them, please contact Hiside for detailed inquiries~

What should I do if the vibrating screen box is cracked?

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The main body of the vibrating screen is composed of a screen box,a tension plate and a screen mesh.After a long time use of the lifting screen box,there may be problems such as cracking.What should I do if the vibrating screen box is cracked?This article introduces the main reasons and treatment measures for the cracking of the vibrating screen box for your reference.

Reasons for cracking of vibrating screen box

1.The production load is too large,causing the equipment to run overloaded and cannot bear it,and the screen box cracks and the beam breaks failure;

2.The parts in the screen box such as the screen mesh are loose due to various reasons and resonate with the vibrating screen,causing cracking failure;

3.Due to the design of the equipment itself,the screen box steel beam is relatively thin and cannot adapt to the harsh production environment,causing the equipment to crack;

4.Deflection vibration of the vibrating screen causes cracking.Arc vibrating screen

Treatment measures for cracking of vibrating screen box

1.Appropriately increase the inclination angle of the vibrating screen to increase the sliding speed of the screen surface and reduce the thickness.

2.Replace the original plate screen with a bar screen.

3.Improve the support ribs on the screen surface of the vibrating screen,increase the number of support ribs in the middle of the screen(increased from 3 to 5),and each of them is consistent with the middle one.It has the function of installing fixing bolts and passing multiple pressure plates.Press tightly to ensure that the screen is fixed and reliable,and resonance cannot be achieved.

4.By processing the reinforcing ribs,using the original bolt holes on the screen box,install the reinforcing ribs near the 4 supporting feet to strengthen the strength of the side plates of the screen box.

5.Through the rectification of the vibrating screen into the hopper,the feeding situation is improved,and the height of the support foot damping spring is regularly measured to ensure the balance of the support foot.

6.Regularly check all parts to ensure that the equipment is fault-free,and when lubricating,each vibration exciter bearing adopts quantitative lubrication to ensure that the resistance of the grease in each vibration exciter to the vibration exciter is roughly the same,and the vibration track is normal.

From the above content,it is not difficult to see that if you want to avoid cracking of the vibrating screen box,you must first ensure that you buy a high-quality vibrating screen,and secondly,you must do a good job in the maintenance of the vibrating screen.As a vibrating screen manufacturer,Haiside Heavy Industry produces vibrating screens with stable performance and reliable quality.If necessary,you can leave us a message for detailed consultation.

Causes and solutions of blockage of vibrating screen

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Linear vibrating screen is an important equipment in coal preparation, mineral processing, building materials, electric power and chemical industries, and various faults often occur in daily use, which affect the use. For example, vibrating screens often encounter the problem of screen clogging when sieving materials. Today, the editor summarizes the reasons for the blockage of the linear vibrating screen, and solves the problem of blockage through corresponding methods.

Causes of blockage of vibrating screen

The processing capacity of the vibrating screen is positively correlated with the effective opening rate of the screen. The larger the effective opening rate, the better the penetration of the material and the greater the processing capacity of the vibrating screen. In actual production applications, there are two factors that cause the effective opening rate of the vibrating screen to decrease (ie, the screen is blocked): one is the proximity effect, which refers to the formation of particles with the same diameter as the screen being embedded in the mesh. Clogging; there is also the accumulation effect, which is mostly caused by the stickiness of materials or the blocking of the screen caused by accumulation and agglomeration caused by electrostatic mutual adsorption. Therefore, to ensure the throughput, the cleanliness of the screen mesh must be maintained. There are generally two main reasons for the blockage of the vibrating screen: the first material and the second screen. Specifically, the reasons for the blockage of the vibrating screen can be summarized as follows:

1. The density of the material is high, and the selection of the screen is inappropriate;
2. The material to be screened is wet;
3. The material to be screened has static electricity or is easy to stick;
4. The screened materials are lighter;
5. The screen wire has a large diameter and is not easy to blank;
6. The bottom of the screen lacks a net cleaning device (rubber bouncing ball), also known as a clear tennis ball;
7. The woven screen wire is too thick;
8. Spherical particles or materials with multiple contact points to the sieve holes;
9. There are more flaky particles;
10. Thicker screens, such as rubber screens, have unreasonable hole shape design, which does not reach the upper and lower sizes, which causes the particles to get stuck. Because most of the material particles that need to be screened are irregular, the causes of blockage are also diverse.

The solution to the blockage of the vibrating screen

In order to effectively prevent the blockage of the linear vibrating screen, measures should be taken to address the reasons for the blockage of the screen:
1. Analyze and judge the materials to be screened, and select the appropriate screen. If the screen is blocked, the first thing to consider is whether the particle size of the screened material is appropriate, and more importantly, the characteristics of the screened material. If it is viscous, it will easily stick to the screen and cause the screening efficiency to drop. You can properly adjust the amplitude of the vibrating screen to see the effect.
2. In addition, the poor self-cleaning ability of the screen may also cause the mesh to be blocked. At this time, if the vibrating screen permits, a ball support plate can be installed, which uses the principle of a bouncing ball to make the screen Clean up.
3. When sieving materials with fine particles, high moisture content and mud content, the materials are easy to bond, and when the moisture content is greater than 5%, they need to be dried, dehydrated and then screened. If the moisture content is greater than 8%, wet screening is required. .
4. For materials with more flake particles, pay attention to adjusting the crushing method of the materials and the particle size matching of different crushing processes.
5. The vibrating screen is equipped with different numbers of rubber bouncy balls under different meshes.
6. Reasonable adjustment of the tension of the vibrating screen is an effective way to reduce the hole blocking of the screen. The reasonable tension makes the screen and the supporting beam produce a slight secondary vibration, thereby effectively reducing the phenomenon of hole blocking. Occurrence, this can better make the screen work properly. The specific method is: the tension hook is made into a constant tension mechanism, that is, a spring is installed on the tension bolt, so that the phenomenon of blocking the holes of the vibrating screen can be avoided, and the screening effect can be improved, so that the vibrating screen can be screened. higher efficiency.