Mining vibrating screen is a kind of large-scale screening equipment, commonly used in the mining industry, etc. The use of this vibrating screen to screen materials generally requires relatively large output. In use, we also hope that the larger the output of the equipment, the better. Since the models and specifications produced by each vibrating screen manufacturer are different, the output of each equipment is also different, but this can be improved by some methods, so how to increase the output of the vibrating screen?

The method of increasing the output of vibrating screen

1. Improve the opening rate of the screen mesh

Because the ore is relatively large in mesh, a metal woven mesh or punching plate with a large aperture is generally used. If you want to increase the output, you can also replace the screen mesh with a larger aperture than the previous one for production. The high opening ratio is beneficial to improve the screening effect; but the disadvantage is that it is not as high as the previous screening. Therefore, once the output needs to be increased, it will inevitably affect the screening accuracy.

2. Adjust the feeding method

A distribution device can be installed at the feed port of the linear vibrating screen, so that the material can be evenly fed to the screen surface to achieve the requirement of increasing the output, which is of great help to improve the screening output of the linear screen. If the distributor is added unconditionally, attention should be paid to manual feeding to ensure uniform feeding. When feeding, the cloth should be evenly distributed.

3. Increase the screening area

The screening area of ​​the linear vibrating screen can be achieved by increasing the length and width of the screen surface. The width of the screen surface determines the processing capacity of the sieve. The wider the screen surface, the greater the output; the length of the screen surface determines the screening efficiency. The longer the screen surface, the longer the material screening time, and the higher the efficiency. After the size is reduced, the sieving efficiency improves little or not at all. At this time, increasing the length of the sieve surface will only increase the volume and weight of the sieve.

4. Adjust the inclination of the screen surface

Adjusting the angle of the screen surface is also an important method to increase production. The larger the inclination angle of the screen surface, the faster the material layer moves forward on the screen surface, and the larger the output, but the time for the material to stay on the screen surface is shortened, which reduces the chance of particles passing through the screen and reduces the screening efficiency. The inclination angle is 45°. If the screened material is not high in accuracy and only needs to be screened roughly, the height of the vibration spring under the lower base and the screen body can be adjusted appropriately. This angle is generally controlled at ≥10°, so that the height of the feeding port can be adjusted. The rise can speed up the movement of the material on the screen surface to increase the output. It should be noted that if you continue to increase the height, the screening effect will not be achieved.

5. Increase the excitation force of the motor

The strength of the motor’s exciting force directly affects the screening effect. The greater the exciting force, the greater the screening output. It should be noted that the linear vibrating screen is a double motor. The use time should pay attention to the adjustment of the motor’s exciting force on both sides. equal.

6. Install the net cleaning device

The bouncing ball is installed between the screen and the punching plate to continuously bounce up and down to hit the screen, so that the ore stuck and stuck between the screen holes is bounced and dropped by the impact to achieve the effect of effective net cleaning. Through the cleaning method, the material can quickly pass through the screen, so as to achieve the purpose of screening, effectively improve the screening rate of the material screened by the mining vibrating screen, and increase the output of the mining vibrating screen.

7. Adjust the inclination angle of the screen machine

The design inclination angle of the mining vibrating screen is usually 45°, but in the actual use process, if there are few impurities in the material, only a coarse screen is required, and the user can appropriately adjust the height of the vibration spring at the lower part of the feeding port to make the feeding The increase of the mouth height can speed up the movement of the material on the screen surface and increase the output.

8. Screen surface management

The vibrating screen will cause certain damage or even corrosion to the linear screen due to the residual materials on the screen surface and the screen body, which will reduce the life of the machine and reduce the output. Therefore, when the machine operation is completed, the materials on the screen surface should be completely screened. Clean and then turn off the power, stop working.

9. Regular maintenance of vibrating screen

The materials screened by the mining vibrating screen are very rough, so the material itself will be difficult to handle, so the material may block the screen or remain in the screen box during shutdown, and the long-term residue will also reduce the durability of the vibrating screen. Therefore, in a certain sense, regular maintenance of the vibrating screen can also increase the output.

Reasons for the low output of vibrating screen

1. Uneven force on the screen surface

1) Uneven feeding. In the process of ore mining vibrating screening, if the feeding is uneven, the ore distribution on the screen surface will be uneven; if the feeding is too much, the screen material will be too thick, one screen will be seriously overloaded, and the other screen will be almost No-load operation and load production, resulting in blockage of the screen will lead to a decrease in production, and will often cause uneven wear and tear of the screen and rapid damage.

(2) The force on the screen surface is too large. The distance between the funnel and the feeding end of the circular vibrating screen is too high, reaching 400 mm. When the ore enters the circular vibrating screen from the funnel, the impact force on the feeding place is too large, resulting in the fracture of the girder at the feeding place and the cracking of the box; the ore enters the circular vibrating screen. After the vibrating screen enters the material end, the distribution is uneven, the ore always runs to one side, and only half of the screen meshes play the role of screening, resulting in serious ore accumulation on one side and low screening efficiency.

2. The material stays for too long

The ore and other logistics move slowly on the screen, and the screen surface accumulates too much ore, reaching a thickness of 200mm. Through multiple measurements of the moving speed of the material on the screen surface, the speed is about 0.2m/s. The moving speed of the ore is too slow, resulting in too much ore on the screen surface, so that the vibrating screen always runs in an overloaded state. It affects the screening accuracy and yield.

Factors affecting the output of vibrating screen

1. Particle and sieve shape

The meshes of the material particles and the supporting screen of the vibrating screen should be compatible with each other. For example, the spherical particles mostly use circular screen holes, while in the feed industry, for the cylindrical or irregular particles, there are both circular and rectangular. The sieve hole, the state of the material particles when they contact the sieve hole has a great influence on whether the particles can pass through. Whether the material can pass through the screen smoothly has some chance. It can be concluded by statistical means that the material with cylindrical particles in actual production generally uses rectangular meshes, while for irregular particles, circular meshes are mostly used.

2. The opening rate of the screen mesh

The opening rate of the screen will affect the output of the vibrating screen. The opening rate of stainless steel woven mesh is large and the strength of the mesh can be used normally. It is also widely used in practical applications.

3. Materials placed on the screen surface

If the material is thickly stacked on the screen surface, the material on the upper layer will be discharged from the upper discharge port before it can pass through the screen, which will lead to the loss of net raw materials, and mixing will occur in the screening and grading operations. material phenomenon, affecting the quality of the finished product. Of course, the material layer cannot be too thin, otherwise the output will be relatively small. According to the test, the appropriate material layer thickness is obtained, and an average value is obtained between the inclination angle of the screen surface and the amplitude of the screen body.

The above is the answer to how to improve the output of the vibrating screen. You can improve the output of the vibrating screen in a targeted manner according to the method analyzed by the editor above and combined with your own situation. More importantly, after the vibrating screen is used, it is necessary to maintain and maintain the vibrating screen, which is of great benefit to the stable production of the vibrating screen.

The vibrating screen is a screening equipment often used in the sand and gravel industry. It uses the exciting force generated by the exciter to screen the material, which is convenient for the next production of the material. However, the vibrating screen does not run continuously for 24 hours. When the production is not in use, the vibrating screen equipment must be shut down. Sometimes when it is restarted, it may be difficult to start. Then when the vibrating screen starts What about difficulties?

Reasons for the difficulty in starting the vibrating screen

1. The exciter is faulty

The common reason for the difficulty in starting the vibrating screen is the failure of the vibrating screen. When the vibration exciter parts are working, it is necessary to ensure a good lubrication state, not only high-efficiency lubricating grease, but also preventing the lubricating grease from thickening, solidifying, and agglomerating, so as to play its due lubricating function.

Solution: Check the lubrication of the exciter and replace the appropriate lubricating oil.

2. Power failure

Check if the power supply is faulty, and then check the current of the motor. If the motor is faulty, you need to replace the new motor components; the assembly line of the vibrating screen is composed of centralized control circuits. When some components are damaged, it must be timely. Replace with new components; sometimes the voltage is unstable, and the voltage at startup is lower than the rated voltage, which is prone to failure.

Solution: replace the new motor parts; ensure the voltage stability during the working process of the vibrating screen.

3. The vibrating screen itself is faulty

Once again, the linear vibrating screen equipment itself has malfunctioned. Due to the large change in the supply flow of the material, the feeding amount of the linear vibrating screen exceeds the specified feeding value, causing the material to form a blockage on the screen surface. When the material accumulates to a certain amount. , The working load of the linear vibrating screen is large, which makes it impossible to start normally.

Solution: Clean up the materials on the screen surface to ensure that the screen surface can screen the materials smoothly.

Precautions before starting the vibrating screen

1. Before starting the vibrating screen, check whether the screws and locking parts are firm and whether there is looseness.

2. Check whether the screen of the vibrating screen is pressed tightly, and whether the connection between the motor, rubber pad, screen body and frame is in good condition.

3. Check whether the power supply voltage of the vibrating screen is stable.

4. Check the vibration motor of the vibrating screen, remove the end cover of the motor, check whether the fan-shaped block and the relative angle of the motor are consistent, and check whether the installation angles of the two motors are consistent.

5. Check the feeding device of the vibrating screen; check the tightening gate of the vibrating screen; check the connection between the motor and the screen body.

6. Check whether the inlet and outlet hoses of the vibrating screen are sealed and connected, and do not overtighten them, otherwise they will be twisted when the screen body moves.

7. Carry out no-load test run on the vibrating screen. During the test run, the reciprocating linear motion is performed, the screen body and the frame have no collision phenomenon, and there are no abnormal phenomena such as abnormal noise and abnormal trajectory movement during the operation. After 10-15 minutes, use a wrench to tighten the bolts used for the drive mechanism.

8. The installation angles of the two motors should be consistent.

In summary, if you want to know what to do if the vibrating screen is difficult to start, first find out the reason for the difficulty in starting, mainly because there are some faults in the exciter, power supply or the vibrating screen itself. For example, the exciter may be due to improper lubrication, so It is necessary to check the lubrication and replace the appropriate lubricant. In addition, the operator should always pay attention when operating to ensure the normal production of the vibrating screen.

In mining and other industries, it is necessary to use vibrating screen to screen materials. When the vibrating screen is used, it has a strong exciting force, and the material is also screened because of this exciting force. After using the vibrating screen for a period of time, the screen machine may have a problem of large beating. If the beating is serious, it may cause the side plate to break. Therefore, when this phenomenon is found, it should be solved immediately, but the first thing is to analyze the cause.

The reason for the large vibration of the vibrating screen

1. The damping spring has high hardness
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If the hardness of the vibration damping spring is too large, it may not be able to achieve the effect of buffering, so the vibration screen will have a problem of large beating when it is running. Because the function of the damping spring is to connect the screen base and the screen frame, and it can also play a buffering role. Therefore, the hardness of the damping spring should not be too large.

2. Bearing radial clearance problem

If the radial clearance of the vibrating screen bearing is too small or too large, the bearing system will generate large vibration, and the whole vibrating screen machine will show a large beating phenomenon. When the radial clearance is too small, it will cause high frequency vibration; when the radial clearance is too large, it will cause low frequency vibration. If the radial clearance is too large, the radial natural frequency of the bearing elastic system will be reduced, resonance will easily occur, and large low-frequency vibration will be generated.

The main reason is that a large acceleration occurs at the impact point of the rolling element and the ferrule. In the early stage of the shock, a high-frequency compression wave irrelevant to the mass of the equipment and the shape of the object is generated and transmitted to the inside of the metal; while in the later stage of the shock, a mechanical vibration with a lower frequency than the shock compression wave is generated by the mechanical force. Therefore, the radial clearance is large, which increases the vibration of the bearing in the passband.

3. Exciting force is too strong

The vibration motor of the vibrating screen provides exciting force to the equipment during operation. If the motor power and model do not match, it may cause large jump or displacement during use. In order to increase the screening output or accuracy, some customers may adjust the motor excitation force to exceed the rated range, which may also cause the vibrating screen to vibrate violently.

4. The outer ring and the supporting hole are too tight

The cooperation between the outer ring and the support hole will affect the transmission of vibration of the vibrating screen. If the fit is relatively tight, it will force the raceway to deform and increase the shape error, resulting in an increase in vibration and a large jump. A looser fit can hinder the oil film in the gap. When the material properties of the outer ring and the bearing hole of the bearing seat are quite different, especially if the rubber damping ring is placed between them, the vibration transmission will be suppressed.

5. Improper installation of screen machine

When installing the vibrating screen, if the ground is uneven or improperly installed, it may cause excessive vibration, which will cause the vibrating screen to jump greatly.

6. Motor steering is inconsistent

The vibrating screen with double vibrating motor will adjust the steering of the motor when it leaves the factory, but when the motor is worn or damaged, if the motor rotation or power is inconsistent when the user replaces the motor, it may cause the vibrating screen machine to vibrate violently.

7. Loose anchor bolts

If there is abnormal vibration caused by uneven ground, it is necessary to check whether the anchor bolts are loose. Under the action of vibration, the long-term work of the vibrating screen will loosen the anchor bolts of the fixed base, which will cause the vibrating screen to vibrate too much during operation.

The solution to the large vibration of the vibrating screen

1. Users can solve the problem caused by excessive spring hardness by choosing high-quality springs.

2. If the user wants to adjust the exciting force, it needs to be adjusted within the range that the motor can bear. You can consult the manufacturer, or ask the technicians to purchase a model that is reasonable based on the properties of the materials provided, screening requirements, and output requirements.

3. When installing the vibrating screen, it should be noted that it needs to be installed according to the steps, and preparations should be made before installation, then install the support or hanging device, connect the screen box to it, and then install the motor and triangle tape to fix the screen surface. Note that debugging work is required to enter normal operation.

4. When the motor steering is inconsistent, it is necessary to consult a technician to re-adjust and install the vibration motor steering or eccentric block.

5. If the vibration screen jumps greatly due to the loosening of the anchor bolts, it is only necessary to tighten the anchor bolts.

The above is the introduction of the reasons for the large vibration of the vibrating screen and the solutions. There are seven main reasons for the large vibration, such as high hardness of the vibration damping spring, too small or too large radial clearance of the bearing, too strong excitation force, Loose bolts, etc., need to be solved according to the cause. For example, if the anchor bolts are loose, the anchor bolts need to be tightened.

The normal operation of the equipment can only be ensured by operating the vibrating screen in accordance with the correct safety regulations during the use of the vibrating screen. Today, the vibrating screen manufacturer will introduce to you the safety operation regulations of the high-frequency dewatering vibrating screen that we need to abide by!

Precautions for the installation of high-frequency dewatering vibrating screen

(1) When the vibration exciter is installed and repaired, it shall not be beaten hard or have a different phenomenon, and ensure that the original bearing is used and shall not be interchanged.

(2) The thickness and quantity of the eccentric block or counterweight plate attached to the eccentric block must be the same, and the radial clearance of the bearing should be C3 grade.

(3) The connection between the universal joint and the vibration exciters on both sides must be concentric, the eccentric blocks on both sides are in the free plumb position, and the universal joint connecting bolts can pass through smoothly; if there is any deviation during installation, check the universal joint Whether the joints at both ends of the section are concentric, do not swing the eccentric block angle for installation.

(4) The vibrating screen should be installed with springs with the same stiffness. The spring stiffness on both sides of the feeding end and the discharging end should be as consistent as possible, and the allowable height difference does not exceed 3mm.

(5) Both sides of the support seat of the rubber spring of the vibrating screen should be in the same horizontal plane, and the error is between 2-4mm to ensure that the materials on the screen surface advance evenly.

(6) When using electric welding to install or disassemble parts, the ground wire must be directly fixed on the welded workpiece and as close as possible to the welding point, and the welding current must not pass through any bearings or joints.

(7) In principle, welding should not be performed on the side plate. Depending on the current environment, if connecting components are required, the side plate should be drilled and then connected with bolts.

(8) The universal joint must be concentric, and a protective device must be installed to prevent it from breaking and falling and hurting people.

Precautions for the use of high frequency vibrating screen

1. Understand equipment related knowledge

The operator should ensure that the operator understands the scope of use and technical performance parameters of the equipment; has sufficient understanding and mastery of the structure, principle and common sense of maintenance of the equipment; familiar with the process flow and equipment control of the system; keep in mind the high-frequency vibrating screen Safe operating procedures.

2. Check before operation

(1) The area around the equipment should be checked to ensure that no personnel are left behind to avoid personal injury when the machine is turned on.

(2) Check whether the feeding, discharging chute and under-sieve chute are unblocked.

(3) Check whether the sieve plate and bead bolts are loose, as well as the wear of the sieve plate.

(4) Check whether the V-belt and flexible sheet are in good condition, whether the tightness is appropriate, and whether there is damage. If there is damage, it should be replaced in time.

(5) Check the connection between the universal joint and the connecting bolts of the transition pressure plate, and whether the rubber spring is damaged.

(6) Follow the sequence of the process system to ensure that the empty screen is started and all safety equipment is in a safe and operable state.

(7) The vibrating screen must be started under no load, and the material can be fed after the amplitude is stable.

3. Observation during operation

(1) Observe the distribution of materials on the screen, and make appropriate adjustments if necessary to ensure uniform distribution of materials on the screen.

(2) Observe whether the vibration frequency and amplitude of the vibrating screen are abnormal, and whether the operation is stable.

(3) Check the temperature of the motor, vibration exciter and transmission bearing seat.

(4) Observe whether there are abnormal noises such as collisions and knocks during the operation of the vibrating screen. If it is found, it must be stopped in time.

(5) Check the vibration damping of the rubber spring.

(6) Under normal operating conditions, the bearing temperature should not exceed 45 degrees.

4. Parking precautions

(1) The amplitude of over-resonance of the vibrating screen during startup and shutdown is 5 times of normal, and it should not exceed 8 times.

(2) In any case, as long as an accident occurs, the equipment should be stopped first before contacting the centralized control room and relevant positions.

(3) Under normal circumstances, the sequence of the process system should be followed, and the vibrating screen should be stopped under no load, and must not be stopped with materials.

(4) Pay attention to the large-amplitude swing when parking to ensure the safety of the equipment, and remember to abide by the safety operation rules of the high-frequency vibrating screen.

Precautions for maintenance of high frequency vibrating screen

(1) After replacing the drive belt, it is necessary to re-check whether the outer end faces of the two pulleys are on the same level.

(2) After the overhaul is completed or the electrical components are replaced, the steering must be checked to ensure the safe use and operation of the vibrating screen.

(3) After the equipment is overhauled, the vibration exciter must be turned by hand, and the main shaft should rotate flexibly without friction and jamming.

(4) Regularly check the connection parts of each bolt, which must be firm and reliable, and all bolts must not have any looseness.

(5) Regularly check the wear and tear of the sieve plate.

(6) Check the side plates and beams of the vibrating screen once a month.

(7) Regularly check the rubber spring, V-belt, flexible connecting piece and universal joint.

(8) Lubricate each lubricating point and replace the lubricating oil according to the equipment requirements.

(9) Overhaul the vibrating screen once a year, remove all the vibrating screens for cleaning and oil change, carry out a single careful inspection of the bearings, and replace them if necessary.

The above is a very detailed introduction to the safety operation rules of high-frequency vibrating screen, mainly about the operation rules of installation, use, maintenance and other aspects. We can make a relevant understanding. At the same time, if you encounter any problems in operation, you can contact us