Causes And Solutions of Abnormal Noise of Vibrating Screen

2022-06-26

Vibrating screens are widely used in mining, chemical, building materials, metallurgy, electric power and other industries. The operating quality of the vibrating screen is very important to the entire production process, so the daily maintenance of the vibrating screen is very necessary.

Vibrating screen is a common source of noise. During operation, abnormal noises often appear. Moreover, it has high sound level, multiple sound sources, and complexity. How to solve the abnormal noise problem of the vibrating screen and effectively reduce the noise of the vibrating screen?

Causes and solutions of abnormal noise of vibrating screen
When the vibrating screen linear screening machine is running, once there is abnormal noise, it should be shut down immediately for inspection to avoid damage to other parts of the screening machine or even the production line shutdown. Generally, the inspection can be carried out from the following aspects:
When the vibrating screen transportation support is not removed, the transportation support should be removed immediately.
If the tie ring bolts are not tightened or the tie ring is not fully embedded, immediately tighten the nut or copper nut, and hit the tie ring with a wooden hammer.
The foundation of the vibrating screen is not stable and should be stable. The effect of using the rubber plate on the base of the vibrating screen is better.
The vibrating screen spring is broken or misplaced, replace the spring or reset.
The vibrating screen body and the discharge port are in contact with the hard objects and moved out at a distance greater than 0.5m.
If the fastening bolts of the vibration motor are loose, the bolts of the vibration motor should be tightened immediately.
The inlet and outlet of the vibrating screen should not be connected by a rigid connection, but by a flexible or cloth bag connection.
If the vibrating screen bearing is damaged, it should be stopped and replaced immediately.
When the vibrating screen beam breaks, it should be shut down immediately for maintenance and replacement.

Measures to reduce noise
Generally speaking, in the production process, the noise generated by the vibrating screen is inevitable, but too much noise will have an adverse effect on the body of the staff. The following measures can be taken to reduce noise:
1. Regularly check the looseness of equipment parts
First of all, pay attention to whether the noise is caused by loose equipment. Therefore, in order to reduce the noise, the parts of the vibrating screen, especially the screen plates that need to be replaced frequently, must be fastened first to avoid additional vibration caused by loose parts.
2. Use polyurethane sieve instead of metal sieve
Due to the small modulus of elasticity of polyurethane material and large internal resistance, the use of polyurethane sieve plates instead of metal sieve plates can effectively reduce noise.
3. Screen box side panel with restrained damping layer
The side plate and rear end plate of the screen box are welded or riveted by thin plates. These large-area thin plates will produce strong noise under the action of exciting force. The radiated noise of the panel surface is proportional to the square of the vibration speed of the panel surface. Therefore, beam damping materials can be added to the surface of the plate to achieve the purpose of noise reduction.
4. Bearing inner and outer damping
Damping treatment is adopted between the inner and outer shells of the 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 to effectively reduce the vibration and noise of the bearing.
5. Use flexible spoke gears
In the vibration process, the meshing noise of gears is also a noteworthy noise source. The synchronous gear used on the vibrating screen generally works in a strong vibration environment. Due to the greater influence of internal and external meshing, the impact noise is relatively large.
Due to the large internal resistance and large elastic deformation of rubber, not only can the impact of meshing be reduced, but also more vibration energy can be absorbed. Therefore, flexible spoke gears can be used to achieve the purpose of noise reduction.
6. Use rubber springs instead
During the vibration, there is relative sliding between the end of the spring and the support. Due to dry friction, the frequency of frictional noise is high and the noise is large, so that the local noise at the location of the vibrating screen spring is significantly increased. After using rubber springs, part of the noise is significantly reduced.
7. Chute with rubber lining
The feed trough and discharge trough of the vibrating screen linear screen are welded to the steel plate. The impact and friction of the materials in the chute will also affect the noise of the vibrating screen. Therefore, laying rubber liners on the inner walls of the feed chute and the discharge chute can also reduce the noise of the chute.

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