April, 2021 | Haiside

What should be paid attention to when selecting vibrating screen accessories?

2021-04-29/in News /by admin

Vibrating screen is a mechanical equipment used for screening, filtering, and impurity removal, and the quality of a piece of equipment is determined by the quality of its related accessories in addition to the design and production problems. So what should users pay attention to when choosing vibrating screen accessories? Vibrating screen accessories include: vibrating motor, damping spring, bearing, sealing tape, screen, and cleaning device. When selecting, you need to choose according to production materials and production requirements. The following points need to be paid attention to when choosing vibrating screen accessories.

1. Vibration motor
As the power source of the vibrating screen, the greater the power of the motor, the higher the output and screening accuracy of the equipment. However, the power of the vibrating motor configured for different types of vibrating screens is also different, so it should be selected reasonably. On the other hand, vibration motors can be divided into two types: ordinary and explosion-proof. If the production environment or materials cannot have open flames or overheating, please use explosion-proof vibration motors.

2. Damping spring
The damping spring can not only reduce the resonance of the equipment, but also play a role in connecting the base and the screen frame. The damping spring can be divided into steel springs, composite springs, and rubber springs. The damping springs used by different types of equipment are also different. So please make a reasonable choice when choosing.

3. Bearing
The bearing is an important component linking the vibrating motor and the screen frame, and is the component that realizes the vibration of the screen frame. The selection of bearings can be divided into domestic bearings and imported bearings. The price of imported bearings will be higher than that of domestic ones, but both quality and noise Better than domestic bearings. Therefore, please choose according to actual production requirements when selecting;

4. Sealing tape
Nowadays, vibrating screen manufacturers generally use silicone sealing strips. When selecting, please choose the corresponding sealing strips reasonably according to the diameter of the screen frame;

5. Screen
For the parts directly in contact with the material, the quality of the screen determines the output and screening accuracy. The screen can be divided into metal woven mesh and perforated plate. When screening small particles, powder, and slurry materials, metal can be used. Woven screen, if the material diameter is larger, you can choose perforated screen.

6. Net cleaning device
When the vibrating screen is produced due to the shape of the material, it will be embedded in the mesh and block the mesh. This requires the use of a mesh cleaning device for cleaning. Net cleaning devices include: bouncing ball cleaning device and ultrasonic cleaning device. The bouncing ball cleaning device is more commonly used. The material is silica gel. After the device is started, the bouncing ball receives the vibration of the equipment’s exciting force and hits the screen surface to achieve the net cleaning effect. It can clean up the blocking problem of materials below 200 mesh. Ultrasonic net cleaning device is a new type of net cleaning equipment. The screen surface material is floated by high-frequency and low-amplitude ultrasonic waves to achieve the net cleaning effect. The ultrasonic net cleaning device can clean up problems such as blocking, sticking, adsorption, and theater troupes of materials below 500 mesh.

The above are some of the issues that need to be paid attention to when selecting vibrating screen accessories. A high-quality vibrating screening equipment needs good accessories for auxiliary work, so that the performance of the equipment can reach the ideal state.

How to reduce the noise of the vibrating screen? Introduction to noise reduction methods

2021-04-27/in News /by admin

As a kind of mining machinery,the vibrating screen will inevitably produce various mechanical noises during operation.Of course,in addition to the normal mechanical noise,there are also some abnormal noises.How can the vibrating screen reduce noise?Here is a list of noise reduction methods for vibrating screens for your reference.

Solution to abnormal noise of vibrating screen

When the vibrating screen is in operation,once there is an abnormal sound,it should be shut down for inspection immediately to avoid damage to other parts of the screen,or even the production line is stopped.Generally,the inspection can be started from the following aspects:

1.The transportation support of the vibrating screen has not been removed,and the transportation support should be removed immediately.

2.If the ring bolt is not locked or the ring is not fully fitted,immediately tighten the nut or lock the copper nut,and hit the ring with a wooden hammer.

3.The foundation of the vibrating screen is uneven,so the foundation should be stabilized.A rubber plate on the base of the vibrating screen is better.

4.The vibrating screen spring is broken or dislocated,replace the spring or reset.

5.The vibrating screen body and the discharge port are in contact with hard objects,and the space between them is greater than 0.5 meters.

6.If the fastening bolts of the vibration motor are loose,immediately tighten the bolts of the vibration motor.

7.The connection of the feed port and the discharge port of the vibrating screen cannot be rigid connection,but flexible or cloth bag connection.

8.If the vibrating screen bearing is damaged,stop and replace it immediately.

9.If the vibrating screen beam is broken,it should be shut down immediately for maintenance and replacement.

Vibrating screen noise reduction measures

1.Replace the perforated steel screen with a polyurethane screen or rubber screen with small elastic modulus and low impact noise;

2.Use rubber springs instead of steel springs to reduce impact;install a soft sound insulation cover outside of the exciter;

3.Fasten all parts on the vibrating screen,especially the screen plate that needs to be replaced frequently,to avoid additional vibration caused by the loosening of individual parts;

4.Apply damping treatment between the inner and outer shells of the vibrating screen bearing.The rolling elements of the bearing can be made into hollow rolling elements or damping materials can be added to the hollow rolling elements,which can reduce the vibration of the bearing and reduce the noise of the bearing;

5.Rubber plates are added to the side plates of the screen box,the feeding port,the discharge port and the receiving chassis,which can effectively suppress the high-frequency vibration of the side plates of the vibrating screen and reduce the radiation noise;

6.Use flexible web gears instead of steel gears,and use rubber elastic bodies to transmit torque on the webs of the gears to absorb vibrations caused by gears meshing in and out.

Regarding how to reduce the noise of the vibrating screen,the above is the entire content for everyone.I hope it can be helpful to everyone.It should be noted that when dealing with the abnormal noise of the vibrating screen,it should be carried out in a shutdown state to avoid danger.

What should I do if the sound of the vibrating screen is loud?

2021-04-22/in News /by admin

Vibrating screen is a kind of heavy-duty screening equipment, which has the characteristics of large output, simple structure and long service life. However, it not only produces mechanical noise during operation, but the noise produced by the vibrating screen is unavoidable. It also produces a large amount of dust due to the screening, transportation and mutual impact of ore, which seriously pollutes the working environment. So what should I do if the sound of the vibrating screen is loud? Here are some measures to deal with loud noises.

Measures to deal with the loud noise of the vibrating screen

1. Use bearings with higher precision
The vibration produced during the operation of the bearing includes two aspects: one is the structure, the rolling elements cause a small change in the position of the axis through the compound action, which causes vibration; the other is the manufacturing, the rolling elements, inner and outer rings, The geometric error of the cage after rolling will cause vibration. Load, speed, lubrication and working clearance will affect the vibration of the bearing to varying degrees. Therefore, when selecting the bearing, it is necessary to meet the conditions of bearing life, and secondly, it is necessary to use smaller and higher-precision bearings as much as possible.

2. Polyurethane sieve plate replaces metal sieve plate
Because polyurethane material has small elastic modulus and large internal resistance, switching to polyurethane screen can effectively reduce noise. According to the information, as far as the screen itself is concerned, under the same excitation conditions, the noise of the polyurethane screen can be 15-20dB(A) lower than that of the ordinary metal screen. However, since the noise of the side panels and other components has not yet been reduced, in actual use, the overall noise of the vibrating screen can be reduced by 5dB(A).

3. Add constrained damping layer to the side plate of the screen box
The side plate and rear end plate of the screen box are all made of thin plates by welding or riveting. These large-area thin plates will radiate strong noise under the action of exciting force. The size of the radiated noise of the plate surface is related to the plate surface. The vibration speed is proportional to the square, and for this reason, constrained damping materials can be applied to the board surface to achieve the purpose of noise reduction.

4. Use flexible spoke gears instead
In the vibration process, gear noise is also a noise source that is worthy of attention due to the meshing of gears. Synchronous gears used in general vibrating screens work in a strong vibration environment. Because of the greater impact of biting and biting, the impact noise is also higher. Due to the large internal resistance and large elastic deformation of rubber, it can not only reduce the impact of biting and biting, but also absorb more vibration energy. Therefore, flexible spoke gears can be used to achieve the purpose of noise reduction.

5. Use rubber springs instead
During the vibration, relative sliding occurs between the end of the spring and the support. Because it is dry friction, the frequency of friction noise is high and the sound is loud, so that the local noise at the position of the vibrating screen spring is significantly increased. After the rubber spring is used, part of the noise can be significantly reduced.

6, chute with rubber liner
The vibrating screen has an inlet chute and a discharging chute. The chute is welded with steel plates. The collision and friction of the material in the chute will also affect the noise of the vibrating screen. For this reason, rubber is laid on the inner wall of the feeding and discharging chute. The liner can also reduce the noise of the chute.

7. Regularly check the looseness of equipment parts
Attention should be paid to whether the noise is caused by the loosening of equipment parts. Therefore, to reduce the noise, all parts on the vibrating screen must be tightened first, especially the screen plate that needs to be replaced frequently, to avoid additional vibration caused by the loosening of individual parts.

How to cool down the vibrating screen?

2021-04-20/in News /by admin

When the vibrating screen is in operation,the temperature generally cannot exceed 40 degrees.Once it exceeds 40 degrees,various failures are prone to occur.However,summer is basically hot weather,which makes the vibrating screen unable to work normally,so how to cool the vibrating screen?

1.Avoid direct sunlight

The vibrating screen is generally outdoors.Long-term exposure will not only make the machine easy to wear and aging,but also make the entire vibrating screen equipment too hot and unable to work normally.

Solution:For vibrating screens that work outdoors,you can build sunscreens or awnings to avoid direct sunlight.

2.Improve the indoor environment

Although there is no direct sunlight,the vibrating screening equipment that works indoors or mines cannot be ventilated,which leads to an increase in the indoor temperature,which eventually increases the temperature of the vibrating screen.

Solution:For vibrating screening equipment working indoors or in kilns,attention should be paid to the adjustment of indoor temperature,as well as ventilation and air permeability.The ambient temperature generally does not exceed 40°C,which provides a good working environment for the vibrating screen.

3.Reduce equipment heating

The high temperature of the vibrating screening equipment is partly related to the high temperature of the vibrating motor.Too high temperature will cause aging and shorten the life of the motor.

Solution:The temperature of each part of the vibration motor winding and other parts is restricted from time to time,which is to limit the allowable temperature of the vibration motor.

The high temperature of the vibrating screen not only affects the screening effect and production capacity,but also seriously affects the service life of the vibrating screen.To extend the service life of the equipment,the operator can carry out daily maintenance and maintenance of the vibrating screen.At the same time,when choosing a vibrating screen motor,the user must choose a motor of the appropriate power.Don’t choose a motor that is too small because it is cheap,which will eventually cause the motor to run under load,resulting in excessive temperature and shortening the life of the vibrating screen.

How to increase the output speed of the vibrating screen?

2021-04-15/in News /by admin

Linear vibrating screen is referred to as linear screen for short. It has many characteristics such as large screening output, high screening precision, good dustproof effect, simple structure and easy operation. It is widely used in many industries such as food, metallurgy, mining, chemical industry, medicine, agriculture, etc. . Some customers hope to speed up the discharge speed of the equipment during use, so as to increase the screening output. If you want to increase the discharge speed of the linear vibrating screen, there are three main methods that can be used, let’s take a look together below.

1. Increase the vibration motor model

The first and common one is to increase the model of the vibration motor. By increasing the model of the vibration motor, the excitation force of the vibration motor can be increased to speed up the movement of materials. Increasing the excitation force of the vibration motor can speed up the discharge speed. The screen body will be overloaded for a long time, which will affect the overall service life of the screen machine. Moreover, because the linear vibrating screen uses dual vibration motors as the excitation source, it cannot guarantee 100% synchronous operation of the two motors. This will not only affect the long-term operation. In the service life of the screen, there will be problems such as steel plate tearing and material deviation.

2. Increase the tilt angle

The second is to increase the inclination angle of the linear vibrating screen during the production process, usually the inclination angle can reach 7-10 degrees, which can increase the output and the discharge speed to a certain extent, but usually adopts a steel grid structure , The net frame is a steel structure as a whole, which is large in itself, and it is very inconvenient to change the net in the fragile net industry such as quartz sand or stones.

3. Increase the feed opening of the screen frame

The third is to heighten the inlet of the screen frame as a whole. Increasing the inlet of the screen frame will indeed increase the discharge speed, but this will increase the height of the equipment as a whole. The height of the screen frame is fixed. If other types are produced The materials need to be purchased separately, which will greatly increase the cost of purchasing equipment.

What are the differences between linear vibrating screen and circular vibrating screen?

2021-04-13/in News /by admin

In the field of mining crushing,vibrating screens are widely used.Common types include linear vibrating screens and circular vibrating screens.There is no essential difference in the style and structure of the two.The materials are screened through the vibration of the screen surface.,What are the differences between the linear vibrating screen and the circular vibrating screen?

The working principle of vibrating screen

1.Linear vibrating screen

Vibration motor is used as the source of vibration,so that the material is thrown up on the screen while moving forward in a straight line.The material enters the inlet of the screening machine evenly from the feeder,and produces several kinds of screens through the multi-layer screen.The upper material and the lower material are discharged from their respective outlets.

2.Circular vibrating screen

The motor drives the eccentric block of the vibration exciter through the V-belt to rotate at a high speed,which produces a large centrifugal inertial force,which stimulates the screen box to produce a circular motion with a certain amplitude.The material on the screen is affected by the impulse transmitted by the screen box on the inclined screen surface.A continuous throwing motion is produced,and the particles smaller than the sieve hole are passed through the sieve when the material meets the screen surface,thereby achieving classification.

The differences between linear vibrating screen and circular vibrating screen

1.Movement track:the material on the linear vibrating screen moves forward in a straight line;the material on the circular vibrating screen moves in a circular motion.

2.Vibration exciter:The exciter of the linear vibrating screen is composed of two shafts,and it works by the principle of vibration motor excitation,so it is also called a double-shaft vibrating screen;because the exciter is a shaft,the circular vibrating screen uses The inertial motor works,so it is also called a single-axis vibrating screen.

3.Hole blocking:the material of the circular vibrating screen moves in a parabolic circular trajectory on the screen surface,so that the material is dispersed as much as possible,thereby improving the material’s bounce force,and the material stuck in the screen hole can also jump out,more than a straight line.The probability of the vibrating screen being blocked is small.

4.Installation arrangement:Due to the small inclination of the screen surface of the linear vibrating screen,the height of the screen is reduced,which is convenient for process layout.

5.Screen surface inclination:Generally speaking,the inclination angle of the screen surface of the linear vibrating screen in production is small;but according to the particle size of the material,the circular vibrating screen can change the inclination angle of the screen surface,thereby changing the moving speed of the material along the screen surface.Improve the processing capacity of the sieve machine.

6.Material:Under normal circumstances,the materials used in the production of linear vibrating screens are mainly light plates or stainless steel plates;while the circular vibrating screens are made of thicker plates,and the box body is made of manganese steel to resist the screening process.The impact of the material.

7.Applicable fields:Linear vibrating screen mainly screens fine particles,light specific gravity,and low hardness materials,mainly dry powder,fine granular or micro powder materials,usually in the food,chemical,building materials,and pharmaceutical industries.Wide;the circular vibrating screen mainly screens materials with high specific gravity,large particles and high hardness.It is widely used in mines,coal,quarries and other mining industries.

8.Processing capacity:For the circular vibrating screen,since the exciter is arranged above the center of gravity of the screen box,the elliptical long axis at both ends of the screen box is in a lower eight shape,and the upper end of the elliptical long axis at the feeding end faces the discharge The direction is conducive to the rapid spread of the material,and the upper end of the elliptical long axis of the discharge end is opposite to the discharge direction,which reduces the movement speed of the material,which is conducive to the penetration of the difficult-to-screen material,and the arc-shaped screen surface increases the screen size.Effective area,so the processing capacity is stronger than linear vibrating screen.In addition,for materials that are difficult to screen,the circular vibrating screen can turn the main shaft,so that the direction of vibration is opposite to the direction of material movement,and the speed of the material moving along the screen surface is reduced(when the inclination angle of the screen surface is the same as the rotation speed of the main shaft)to increase the screen.Sub-efficiency.

9.Environmental protection:The linear vibrating screen can adopt a fully enclosed structure without dust spillage,which is more conducive to environmental protection.

In the field of mining crushing,circular vibrating screens are widely used,but in actual production,the choice of circular vibrating screen or linear vibrating screen mainly depends on the type of material handled by the user and the application field.The purpose of screening is different,and the equipment selected is also Will be different.

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

2021-04-08/in News /by admin

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.

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?

2021-04-06/in News /by admin

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.

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

2021-04-01/in News /by admin

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.

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.