What are the materials of the vibrating screen? Which material is better?

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In the sand and gravel production line, the vibrating screen is the basic equipment configuration, which is mainly used to screen and classify the crushed materials and finished sand and gravel. The screen is a key component of the yield and service life of the vibrating screen. So what are the materials of the vibrating screen?Which screen material is better? The following is a specific introduction to the commonly used screen materials of the vibrating screen.

Material of vibrating screen

1. Polyurethane rubber screen

Polyurethane has low stress performance and relatively large toughness. In order to resist the damage to the screen caused by the fall of sand and gravel from the belt conveyor, there are requirements for the diameter and thickness of the screen ribs. You cannot choose too thin or too thin. In the condition of the size of the vibrating screen, it is unavoidable to reduce the opening rate of the screen. This will reduce the penetration rate of the screen. Among the four screens, the penetration rate of the polyurethane screen is lower.

2. Reinforced screen

Reinforced screens have greater stress performance, strong resistance to impacts of sand and gravel materials, and the surface of the steel bars is smooth and flat, which can reduce the barrier to moving sand and gravel materials. It can also have good openings under the condition of the stress performance of the screen. Therefore, the penetration rate of the screen can be greatly improved.

Arc vibrating screen

3. Steel plate screen

Due to its own factors in the use of this kind of screen, the circular openings are often used. Because the holes are directly opened on the steel plate, the entire screen surface is smooth during use, which is convenient for the sliding of sand and gravel materials. However, because the shape of the opening is circular, the sand and gravel are mostly irregular polygons, and the probability of blocking the circular hole is greater than that of the square opening.

4. Square steel screen

The square steel screen has better stress performance, which is greater than that of the polyurethane screen. The square steel screen does not have the shortcomings of the polyurethane screen, and the opening rate and the penetration rate of the screen may be obtained.

Comparison of vibrating screen mesh material

1. Polyurethane screen has good toughness and strong wear resistance, but in actual use, it is understood that its use time is not very ideal. Through observation, it is because the sand and gravel fall from the belt conveyor to the screen during use. There has been a strong impact, which makes the screen ribs of the polyurethane screen easier to break, but perhaps the impact of sand and gravel on the screen can be reduced by modifying the blanking method, thereby increasing the use time of the screen.

2. Due to the use of 16Mn material, the wear resistance of the steel plate screen will be improved, but in the process of use, for the opening rate, the connecting plate between the holes will be thinner, so its resistance The impact is not good, and it will affect the end use time of the steel plate screen.

In addition, the steel plate screen requires frequent fastening of the connecting screws between the screen and the screen support body during use, otherwise relative movement between the steel plate screen and the screen support body will occur, which will greatly reduce its use time.

3. There is not much difference between the reinforced screen and the square steel screen in terms of stress performance and toughness. Therefore, the difference in the impact resistance of the two against sand and gravel is not very large. However, due to the different material choices of the two, they are In terms of performance, the square steel screen is better than the steel screen.

4. The characteristics of the steel screen mesh of square steel than round steel is that the screen mesh is made of square steel and steel under the same diameter condition, and the wearable surface of square steel is larger than that of steel.

In summary, the materials of the vibrating screen are polyurethane rubber screen, steel screen, steel screen and square steel screen. Through the comparison of these materials, it can be found that screens of different materials have their own advantages and disadvantages. When choosing, you can choose according to your own use and needs.

What are the components of the vibrating screen?

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Vibrating screen is a very important material screening equipment in the mining industry.The material can be divided into multiple different levels through a single-layer or multi-layer screen with evenly distributed holes,so as to facilitate the use of subsequent processes.What are the components?The following vibrating screen manufacturer will give you a detailed answer.

The composition of the vibrating screen

1.Vibrator

There are generally two types of vibrators for single-shaft vibrating screens and dual-shaft vibrating screens according to the way of eccentric reconfiguration.The block eccentric type is better for the configuration of the eccentric weight.

2.Screen box

The screen box is composed of a screen frame,a screen surface and a pressing device.The screen frame is composed of side plates and beams.The screen frame must be sufficiently rigid.

3.Supporting device

The supporting device of the vibrating screen has two types:hanging type and seat type.The seat type installation is relatively simple,and the installation height is low,generally should be preferred.The supporting device of the vibrating screen is mainly composed of elastic elements.Commonly used are coil springs,plate springs and rubber springs.

4.Transmission

The vibrating screen usually adopts a V-belt transmission device.The structure of the vibrating screen is simple,and the number of revolutions of the vibrator can be selected arbitrarily,but the belt is easy to slip during operation,which may cause the screen hole to be blocked.Vibrating screens are also directly driven by couplings.The coupling can maintain a stable number of revolutions of the vibrator and has a long service life,but it is difficult to adjust the number of revolutions of the vibrator.High frequency dehydration vibrating screen

Screening process of vibrating screen

The actual screening process is:after a large number of broken materials with different particle sizes and mixed thicknesses enter the screen surface,only a part of the particles contact the screen surface.Due to the vibration of the screen box,the material layer on the screen is loosened,so that large particles exist.The gap is further enlarged,and small particles take the opportunity to pass through the gap and transfer to the lower layer or conveyor.Because the gap between small particles is small and large particles cannot pass through,the original disorderly arrangement of particle groups separates,that is,they are layered according to particle size,forming an arrangement rule with small particles on the bottom and coarse particles on the top.The fine particles that reach the sieve surface can pass through the sieve of those smaller than the sieve hole,and finally realize the separation of coarse and fine particles and complete the screening process.

However,there is no sufficient separation.During sieving,there is generally a part of the under-sieve remaining in the over-sieve.When fine particles are sieved through the sieve,although the particles are smaller than the sieve openings,they have different degrees of difficulty in passing through the sieve.It is more difficult for materials and particles with similar sieve openings to penetrate the sieve,and even more difficult to penetrate the gap between the particles in the lower layer of the screen.

How to replace the vibrating screen bearing? Detailed disassembly steps

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Mine vibrating screens are a powerful partner for crushing equipment in the beneficiation industry, and their bearings are generally heavy-duty bearings in order to carry a certain axial load. In daily work, the bearings that have been used for a certain period of time need to be replaced, so how to replace the bearings of the mine vibrating screen? I will share with you here.

Disassemble the bearing

1. Remove the protective covers 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;
3. Loosen the fastening bolts of the outer eccentric block, remove the outer eccentric block, and remove the shaft key if there is a shaft key. Loosen the fastening bolts of the inner eccentric block and remove the inner eccentric block;
4. Remove the bearing seat compression bolts, screw into the bearing seat removal screw holes with appropriate bolts, and eject the bearing seat from the housing;
5. Remove the bearing gland from the bearing seat, press out the bearing from the bearing seat or eject it with a suitable bolt;
6. If 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;
7. Clean the greasy dirt of various parts.

Arc vibrating screen

Install the bearing

When replacing a new bearing for a mine vibrating screen, the same bearing as the original model must be used.

1. Wash 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 Glue fastening bolts compress the bearing gland;
2. The 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 rotating 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 rotating 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 shaft should have a certain axial series movement;
6. Put on the protective covers at both ends and fasten them with screws.

Installation method of vibrating screen filter and matters needing attention

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In many production industries,vibrating screens are very efficient material screening equipment,but in the process of long-term use,it is inevitable that the screen will wear out,so it needs to be replaced and reinstalled.Here is the sorting out for everyone:The installation method and precautions of the vibrating screen filter,I hope it can be helpful to everyone.

Installation method of vibrating screen filter

1.Remove the net frame of the processing machinery,put the net face down,put it in the PU ring,and bounce the ball;

2.Install the sealing tape evenly around the vibrating screen of the processing machinery;

3.Install the screen assembly and place it flat on the bottom frame of the vibrating screen of the processing machine;

4.Spread the fine mesh evenly on the vibrating screen;

5.Remove the middle frame,press down the screen gently and evenly,and the discharge port of the screen frame of the processing machine can be placed in the circumferential direction as needed;

6.Gently pull up the screen around the vibrating screen,remove the excess part,buckle the ring,and use an open-end wrench with both ends to lock the copper nuts evenly.During the locking process,use the random rubber hammer to beat the beam evenly around.Ring,and then tighten.

Installation Precautions

1.Since the tension of the screen will directly affect the screening efficiency of the screen,the screen must be tensioned when installing the screen;

2.It is necessary to determine the installation of clear rubber balls according to the number of meshes of the materials to be screened and the difficulty of screening,and avoid blindly installing them;

3.When the mesh number of the screen is high or the proportion of the material is relatively large,a supporting mesh with a suitable mesh size should be installed under the screen(the supporting mesh mainly plays a supporting role,which can effectively reduce the pressure of the material on the screen and extend the screen.Service life);

4.In order to avoid the phenomenon of mixing,the screen frame must be assembled to the screen box as required,and the grown screen should be extended into the corresponding outlet;

5.When installing the pressure plate,pay attention to maintaining the flatness of the pressure plate,and line it with a sponge sealing tape with strong flexibility to evenly lock it.This is the key to preventing the occurrence of mixing,and it is also an important factor affecting the life of the screen;

6.After the vibrating screen is installed as required,a small amount of material must be used to test the distribution and screening of the screen.The material is uniformly transported forward,the classification is accurate,and there is no mixing phenomenon,then the screen can be put into use.On the contrary,if the unevenness of material deviation,accumulation,etc.occurs,the flatness and uniformity of the screen surface of the screen should be adjusted.If mixing of materials occurs,check the sealing of the screen and whether it is tight.

The above are the installation methods and precautions of the vibrating screen filter,for your reference only.If you need to replace it,it is recommended to find a professional maintenance personnel to operate it to avoid accidents.

What is the influence of the angle on the vibrating screen

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Vibrating screen is a kind of screening equipment, usually used for impurity removal, filtration and classification in mining, metallurgy and other industries. When purchasing vibrating screen equipment, the manufacturer will according to the customer’s screening requirements, such as output, discharge type and screen. It is recommended that you use specific conditions, such as the purpose of the project, but in actual production operations, the processing capacity of the vibrating screen will be affected by the moisture content of the material and the production environment. By adjusting the angle of the vibrating screen, we can objectively control the processing capacity of the equipment. We often say that the angle of the vibrating screen can be divided into two types, one is the installation angle of the vibrating screen vibration motor, and the other is the screen surface angle of the vibrating screen equipment. Changes in these two angles will directly affect the output of the vibrating screen.

 

The influence of angle on the output of vibrating screen

1. The vibrating motor angle of the vibrating screen
The vibrating motor is the source of the vibrating force of the vibrating screen. The vibration motor drives two sets of vibration exciters installed on the screen frame to generate vibration through the flexible coupling. The vibration motor has an eccentric weight on the upper and lower sides of the vibration motor, also called an eccentric mass, and the shielding effect is basically achieved by the vibration motor. Adjust the eccentric blocks at the upper and lower ends. By adjusting the number of upper and lower eccentric blocks, the horizontal vibration amplitude and the vertical vibration amplitude of the screen surface can be controlled, thereby controlling the exciting force. The angle between the upper and lower eccentric blocks of the vibrating screen is what we often call the vibrating motor angle. By adjusting the angle of the vibrating screen motor, the running track of the screening material in the vibrating screen can be adjusted. Usually, the material is inside the vibrating screen. Speed ​​of operation and propagation. After the material enters the material inlet from the vibrating screen, it will fall onto the screen and then spread to the surrounding area. The diffusion will gradually complete the screening process. The smaller the angle of the vibration motor, the faster the material will diffuse to the surrounding area. If you want to screen the material in the vibrating screen for a period of time to improve the screening accuracy and further improve the screening effect, you can achieve this by lowering the angle of the vibrating screen a bit.

Banana screen

2. The inclination angle of the screen surface of the vibrating screen
The angle between the screen surface of the vibrating screen and the horizontal direction is called the inclination angle of the vibrating screen. The influence of the inclination angle of the screen surface on the screen hole size is relatively easy to understand. The inclination of the screen surface is large, and the time for the material to stay on the screen surface is short, so it is easy to discharge the screen material, and the processing capacity per unit time is large, but the speed of the screen is very high. The layer of material moving forward on the screen surface is fast, reducing the chance of particle penetration and reducing the efficiency of screening, which means that it is not easy to screen and clean. On the contrary, the smaller the inclination angle of the vibrating screen, the longer the material stays on the surface of the screen. Although the processing volume becomes smaller, the material has more chances to pass through the sieve, so the sieving consumption will increase. In the actual production process, we can control the tilt angle of the screen surface according to the specific characteristics of the material. Generally, the angle of the screen surface is about 15-25°. For high-viscosity or other materials that are not easy to screen, we can appropriately reduce the screen inclination angle of the vibrating screen to improve the screening accuracy.

 

Vibrating screen installation angle requirements

1. Generally speaking, without any special circumstances, the angle between the eccentric blocks of the vibration motor of the vibration screening machine is 45° when it leaves the factory.

2. The material of the linear vibrating screen machine moves linearly on the appearance of the screen. The skewness that the linear screen machine will have is based on the flow of stones in the screen. The angle between the screen and the degree surface is usually less than 15°, and the material can be processed. Screen and add skewness, but it should not exceed 25°. Linear screen machinery also needs to keep the bracket on the ground, so as not to stop moving during operation.

3. The skew angle of the discharge end of the dewatering vibrating screen is 5-10°.

Whether it is the adjustment of the vibrating motor angle of the vibrating screen or the adjustment of the inclination angle of the vibrating screen, it should be within a small range. Line control, so as not to damage the main components such as the motor. In the process of using the vibrating screen, installation and adjustment should be carried out in strict accordance with the manufacturer’s instructions, and attention should be paid to maintenance and maintenance during the operation, so that it can better use the vibrating screen.

How to adjust the vibration screen amplitude is insufficient?

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Vibrating screen is a kind of material screening equipment commonly used in the mining industry.It mainly uses the vibration of the multi-layer screen to make the material particles fall into the hopper,and then screen out materials of different particle sizes,but if the amplitude of the screen is not enough,it will Affecting the screening efficiency,how to adjust the amplitude of the ANA vibrating screen?Here is a summary of the impact of vibrating screen amplitude on screening efficiency,as well as methods to increase the amplitude,for your reference.

The influence of amplitude on the efficiency of vibrating screen

Generally,the larger the vibrating screen model,the larger the selected amplitude.Because the greater the amplitude of the vibrating screen,the less the blockage of the screen holes will be,which is more conducive to the screening and stratification of the ore,and better screening production capacity is obtained.

But it should be noted that if the amplitude of the vibrating screen is too large,the strong vibration will cause greater damage to the vibrating screen itself.The choice of vibrating screen amplitude is usually determined by the particle size and properties of the ore.When the ore particles are small,moist and still have a certain viscosity,low frequency and large amplitude are required.

In addition,the corresponding amplitude and frequency should be selected for different screening operation stages.For example,pre-selection screening operations generally use low frequency and large amplitude,while dehydration and de-intermediation operations use high frequency and small amplitude.

High frequency dehydration vibrating screen

Method of adjusting the amplitude of vibrating screen

1.If the vibration source is a vibration exciter,you can increase(decrease)the weight of the eccentric block(increase or decrease the secondary eccentricity).

2.If it is a vibrating motor,the amplitude adjustment depends on the angle between the eccentric blocks at both ends of the motor shaft to change the size of the exciting force.If the angle is small,the exciting force becomes larger,and the amplitude becomes larger;otherwise,the angle becomes larger and the vibration is excited.The force becomes smaller and the amplitude becomes smaller.

3.For the shaft eccentric vibrator,the counterweight on the flywheel and belt wheel can be increased or decreased to increase or decrease the amplitude of the vibrating screen.

It should be noted that the adjustment amount of the vibration source(vibrator or vibration motor)on the vibrating screen must be the same,otherwise the vibrating screen will be damaged.

In production,the screening efficiency of the vibrating screen is related to many factors,such as material properties,equipment structure and various performance parameters.Aside from the rigid factors of material properties and equipment structure,the parameters of amplitude,vibration frequency,vibration direction angle,screen tilt angle and ejection angle have a great impact on the production efficiency of the vibrating screen.During installation and commissioning Pay more attention to the adjustment of these parameters.

Seven reasons for the material deviation of the linear vibrating screen

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The linear vibrating screen uses a vibrating motor as the source of vibration, so that the material is thrown up on the screen and moves forward in a straight line at the same time.
The material enters the feed inlet of the screening machine evenly from the feeder, and passes through the multi-layer screen to produce several specifications of oversieve and undersieve.
Don’t exclude them from their respective outlets. During the operation of the linear screen, the material does not move in an arc-throwing straight motion and deviates to both sides of the box. This is the phenomenon of material deviation. So what are the reasons for the material deviation of the linear vibrating screen? Let’s take a look together!

1. Improper installation of vibration motor

Because the linear vibrating screen is used to transport and screen the material through the vibration source body, that is, the vibrating motor gives the material a designed and fixed direction and a fixed magnitude of excitation force. Therefore, when there is a poor conveying situation, basically It can be judged that there is a problem with the installation angle of the vibration motor.

2. The equipment runs for a long time

The equipment has a heavy workload and long running time. Whether it is a human or a device, there is a certain limit to the amount of work that can be undertaken every day. People who work for a long time will become tired or even sick, and the equipment will also fail. Compared with the large linear vibrating screen, due to its heavier weight, if coupled with the long-term large-scale screening work, some parts of the machine body will become loose due to this long-term repeated vibration and strong inertia. , Which may cause the angle of the vibration motor to change, and the phenomenon of material deviation.

3. Not evenly feeding as required

The requirement repeatedly mentioned in the manual of the linear vibrating screen is: uniform feeding. Because if the material is fed suddenly, it is easy to cause unstable screening accuracy, and due to the amount of material, the deviation of the force of the material is large, and the problem of the material being discharged to one side occurs.

4. Uneven excitation force

The uneven excitation force on both sides of the linear vibrating screen leads to deviation caused by the different amplitudes on both sides. Adjusting the eccentric weight of the two vibration motors to the same angle can basically solve this problem.

5. The sieve body parts are aging and loose

Linear Vibrating Screen
In addition to the vibrating motor that provides the main source of power for the linear vibrating screen, the linear vibrating screen shock absorber exists due to shock absorption
Springs, bouncing balls, sealing rubber rings, etc. more or less also affect the vibrating force and the horizontal stability of the linear vibrating screen body. If a certain component has problems such as aging, the linear vibrating screen surface is not flat, the screen machine is unstable, etc., which will cause the problem of the deviation of the discharge direction. In severe cases, there will be sudden abnormal noises and serious wear of the linear vibrating screen. The service life will be greatly reduced. And other issues. Therefore, it is necessary to carry out regular inspection and maintenance of the equipment, and the materials of the parts are also very important.

6. The position of the center of gravity is unstable

The unsteady position of the center of gravity of the linear screen itself or the unbalanced position of the eccentric block of the motor is also one of the reasons that cause the material of the linear vibrating screen to deviate.

7. Different materials for damping spring

It is also an old-fashioned quality problem. The damping spring is no less important to the linear vibrating screen than the vibrating motor. It plays a pivotal role in maintaining the stability of the linear vibrating screen and extending the life of the linear vibrating screen. Many prices are much lower than Manufacturers with normal sales prices rely on cutting corners for accessories and consumables to attract customers, causing some customers to suffer heavy losses.

8. Deformation of the screen box

The screen box refers to the screen above the vibrating motor and below the feeding port, which is composed of a screen frame and a fixed screen surface around it. Under normal operation of the linear vibrating screen, especially the large and high-frequency linear vibrating screen, the screen frame needs the strong excitation force from the gravity of the mass screening material and the vibrating motor at the same time. If the strength is not enough, it is easy to deform, The problem of damage. The strength of the screen box mainly depends on the manufacturer’s material selection, welding process, and additional stable design.

In the case of material deviation in production, you can check one by one according to the above 7 reasons to find the root cause of the failure and the corresponding solution. In addition, in daily production, you should be familiar with the working principle, performance and common failure phenomena of the vibrating screen, operate it correctly, and do daily maintenance to reduce the failure rate and improve work efficiency.

What to do if the vibrating screen has torsional vibration

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When the vibrating screen is in use,two motors are usually used to drive to ensure sufficient efficiency and vibrating force.However,it is easy to cause material deviation,resonance,and stagnation.This phenomenon is called torsional vibration.What should I do if the vibrating screen has torsional vibration?Here are the reasons and solutions for the torsional vibration of the vibrating screen for your reference.

Reasons for torsional vibration of vibrating screen

Generally speaking,the possible reasons for the torsional vibration of the vibrating screen are as follows:
1.The direction of the exciting force generated by the shaker of the vibrating screen is deflected and offset.
2.The spring damping system and different parts of the linear vibrating screen are malfunctioning.
3.The linear vibrating screen is not placed on a horizontal surface,and the screen surface cannot be kept level.

Solution to torsional vibration of vibrating screen

1.Design and manufacturing

1)Check whether the sieve frame is a standard rectangle,not a parallelogram.
2)Check whether the spring supports of the sieve machine are on the same level during the design and manufacturing process,and whether the selected springs have the same stiffness.
3)Whether the self-synchronization between the two vibrators is normal.
4)Whether the phase angles adjusted by the main and auxiliary eccentric blocks of the vibrating screen on both sides of the same shaft are consistent,because it is related to whether the exciting force that occurs is consistent.

2.Equipment

1)Whether the spring support of the screen machine can be installed on a uniform level,and whether the current shrinkage is the same,the error cannot exceed 5mm.
2)In the case of universal joint device,whether the phase angles on both sides are the same,other reasons should be further judged based on the detailed screen and the operating conditions.

Methods to prevent torsional vibration of vibrating screen

1.During each adjustment,the included angles of the eccentric blocks at both ends of the vibration motor must be equal,and they must be biased to the same side of the vibration motor.
2.Check the rubber springs to ensure that there is no height difference between the springs.If there is,replace the damaged parts to solve it.
3.Perform a comprehensive balance check on the linear vibrating screen equipment and ensure that the screen surface is in a horizontal position.
4.Recalculate the hoisting angle of the equipment to keep the hoisting force consistent.

The above are the reasons and solutions for the torsional vibration of the vibrating screen organized for everyone.I hope it can be helpful to everyone.If you want to know more about the vibrating screen,you can leave a message online or send an email,and we will reply to you as soon as possible.

Detailed maintenance and maintenance work of vibrating screen

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The coal industry often uses vibrating screens to classify and screen materials. The vibrating screen is dynamic during operation, so in addition to correct operation and use, strict maintenance work is conducive to the smooth operation of the vibrating screen and improves the screen. The service life of the machine reduces maintenance costs. Below we will give a detailed introduction to the maintenance and maintenance of the vibrating screen.

Maintenance of vibrating screen

The maintenance of the vibrating screen is divided into daily maintenance and regular maintenance. The following is the maintenance content:

1. Daily maintenance

Arc vibrating screen
The daily maintenance of the vibrating screen includes the surface of the vibrating screen, especially the fastening of the vibrating screen, and the vibrating screen should be tightened in time when it is loose. The vibrating screen regularly cleans the surface of the screen. The vibrating screen should repair, rust and paint the peeled parts of the paint in time. The exposed processing surface should be coated with industrial lubricant to prevent rust.

Before starting, check whether the coarse and fine meshes are damaged; whether each group of beam rings are locked; check whether the V-shaped ring of the screen frame of the rotary vibrating screen is damaged. If there is damage, it needs to be repaired in time to prevent material leakage. When starting, pay attention to whether there is abnormal noise, whether the current is stable, and whether there is abnormal vibration. The vibrating screen can only stop working after the feeder has finished supplying materials, remove the dirt and oil on the vibrating screen, clean and repair the screen in time, when the screen is blocked, it can only be hooked up with a hook.

2. Regular maintenance

Regularly check the coarse mesh, fine mesh and spring for fatigue and damage, and whether various parts of the fuselage are damaged due to vibration. The parts that need to be lubricated must be lubricated.
(1) Overhaul once a year, replace the liner, and refurbish the two screen surfaces. The vibration motor should be removed for inspection, and the motor bearing should be replaced with oil. If the bearing is damaged, it should be replaced.
(2) Check the sieve compression device for each shift. If there is any looseness, press it tightly. Check whether the connection of the feed box is loose. If the gap becomes larger, it will cause a collision and cause the equipment to rupture; check the sieve body support device and observe Whether the hollow rubber pad is obviously deformed or degummed, when the rubber pad is damaged or excessively flattened, two hollow rubber pads should be replaced at the same time.
(3) The screen grid should be removed frequently, and the screen surface should be checked regularly for damage or unevenness, whether the screen hole is blocked, etc.; the sealing strip should be checked frequently, and if worn or defective, it should be replaced in time.

Maintenance of vibrating screen

1. Weekly inspection: check whether the vibrator and each part of the bolts are loose, check whether the rubber spring is damaged, check whether the screen surface is damaged or the screen hole is too large, and deal with it if any.
2. Monthly inspection: check the screen frame structure itself or the weld seam for cracks. If cracks are found on the beam or side plate, the surface should be cleaned, and 5mm holes should be drilled at the end to shovel the groove and preheat the repair welding. The repair welding should ensure penetration , After welding, the seam is ground flat, and the reinforcement plate is added. In order to avoid stress concentration, it is not allowed to open holes and welding accessories on the screen frame.
3. Annual inspection: The vibrator should be overhauled. The vibrator should be completely disassembled for cleaning. If the rolling bearing is pitted or broken, it should be scrapped. When reassembling, pay attention to the position of the eccentric block of the vibrator to keep the same phase.

The maintenance and maintenance of the vibrating screen is very necessary. Only regular maintenance can find the problem in time and deal with it in time to ensure the low efficiency of the vibrating screen, reduce mechanical wear, ensure safe production, and avoid small losses. It happened. Hiside Heavy Industries has been focusing on the research, development and manufacturing of vibrating screens for mines for many years. Each screen is fully assembled before leaving the factory and undergoes an 8-hour idling test run. The amplitude and frequency are tested with a VB instrument to ensure the quality and performance of the vibrating screen. And it’s easy to maintain. If you need it, please contact Hiside for detailed inquiry~

Vibrating screen theory and selection principle

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Vibrating screen is a very important stone grading and screening equipment in the mining industry.It can greatly increase the utilization rate of stone and reduce the failure rate of mechanical equipment in the subsequent processes.It is different from traditional manual screens.To help everyone For a good understanding of this equipment,Hiside has compiled the principles and selection techniques of vibrating screens for your reference.

Vibrating screen theory

The working process of the vibrating screen will use the reciprocating vibration generated by the oscillating excitation,and the upper rotary hammer of the vibrator will cause the surface of the vibrating screen to form plane vibration.The lower rotating weight makes the screen surface produce cone-shaped rotary vibration,and its combined effect makes the screen surface produce double-rotation vibration;

The process of dividing the scattered materials with different particle sizes through a single or multi-layer sieve surface with evenly distributed holes multiple times into several different levels is called sieving.The particles larger than the sieve hole remain on the screen surface,and the particles smaller than the sieve hole pass through the sieve hole,and finally the coarse and fine particles are separated and the screening process is completed.

Vibration screening factor

The characteristics of the material to be screened(the content of the material under the sieve,the content of the difficult-to-sieving particle,the content of moisture and clay in the material,the shape of the material,the specific gravity of the material,etc.);

The structure of the screening machine(screen area,number of screen layers,screen hole size and shape,screen hole area ratio,screening machine movement mode,amplitude and frequency,etc.);

The requirements of the beneficiation process(processing capacity,screening efficiency,screening method,screening machine inclination),etc.High frequency dehydration vibrating screen

Selection principle of vibrating screen

(1)After determining the screening area,the width of the screen surface should be at least 2.5 to 3 times the size of the largest piece of material to prevent the screen from being blocked by large pieces of material.

(2)In order for the sieve to be in good working conditions,the ratio of the length to the width of the sieve should be selected within the range of 2 to 3.

(3)A reasonable screen surface material and structure should be selected to adapt to the working conditions.

(4)Determination of the sieve hole size.For fine sieves and curved sieves,when linear vibrating sieves are used for fine particle screening,the sieve slit size is 2 to 2.2 times the separation particle size,and the maximum is not more than 3 times;for vibrating sieves,For the screening of medium-grained materials,the mesh size is 1.2 times the separation particle size;when used for coarse-grained materials,the mesh size is 1.05 of the separation particle size;for probability screens,the mesh size is generally the actual separation 2 to 2.5 times the particle size.

(5)Determine whether to use double-layer or multi-layer sieves.When the size range of the material to be screened is wide,when the double-layer screen is used as a single-layer screen,the processing capacity of the screening machine can be improved,and the lower screen can be protected,and the life of the lower screen can be prolonged.The selection of the sieve hole size of the upper sieve of the double-layer sieve should generally be determined according to the characteristics of the feed particle size,and the amount of the material under the upper sieve,which is equivalent to 55-65%of the original feed amount,can be considered as the sieve hole.size.

Note that when the content of the under-sieve particle in the raw material exceeds 50%,there are many difficult-to-sieve particles,the material contains more viscous mud and high water content,you should try to avoid using a double-layer sieve as a single-layer sieve.

(6)Determine the effective working area of the sieve.The sieving area calculated according to the production process requirements is the effective area of the sieve,and the size of the sieve is the nominal area of the sieve.For the vibrating screen used for the screening of medium-sized materials,the effective sieving area should be 0.8～0.85 of the nominal area of the sieve Times.Of course,this is closely related to the opening rate of the sieve on the screen.

(7)Heavy-duty vibrating screens are mostly used for materials above 200mm;circular motion screens are mostly used for materials above 10mm;linear vibrating screens and high-frequency vibrating screens are mostly used for desilting,dewatering and grading.

(8)When conditions permit,the seat screen should be selected first to facilitate inspection and maintenance.When a hanging screen must be selected,the lifting height should be minimized to reduce the swing range of the vibrating screen and facilitate production operations.

The above is the principle and selection principle of the vibrating screen that Hiside has compiled for you.I hope it can be helpful to everyone.