How to solve the resonance problem of vibrating screen

June.18,2021

The resonance phenomenon of the vibrating screen generally occurs when the machine is started and the machine is turned off. Heavy-duty vibrating screens are prone to resonance. Resonance refers to the phenomenon that the amplitude of the equipment’s natural vibration frequency is close to the working vibration frequency. The vibration of the vibrating screen is in resonance. The amplitude can reach 5 to 10 times the normal range, which can cause damage to the equipment.

Measures to reduce vibration of vibrating screen

1, increase the damping

It can be improved by increasing the damping method, that is, replacing the damping spring of the vibration screening machine with a conforming spring. Because the damping of the conforming spring is greater than that of ordinary metal springs, experiments have proved that the existence of large damping limits the time to pass through the resonance zone, and at the same time The amplitude of resonance is reduced, so the resonance phenomenon when the vibration screening machine is stopped can be significantly reduced.

2, increase the weight

Changing the frequency of the vibration screening machine when it stops is an important idea to reduce the occurrence of resonance. In view of the direct relationship between vibration frequency and quality, it is recommended that the quality of the equipment can be improved, such as the load on welding, which can also reduce vibration screening to a certain extent. The occurrence of machine resonance phenomenon.

3, install brake system

When the vibrating screen is shut down at a constant speed, it is inevitable that the vibration frequency of the vibrating screen will be the same as the vibration frequency of the machine itself in a certain period of time, which will cause resonance. For this situation, only install a braking system on the vibrating screen to make the vibrating screen stop. The vibration frequency of the vibrating screen can be skipped over the natural vibration frequency of the vibrating screen, thus reducing the occurrence of resonance.

4. Connect with the ground

The motor should be installed on a concrete foundation, firmly connected to the ground, or installed on a heavy chassis, in order to increase the natural frequency of the foundation part to increase the vibration frequency (driving force frequency) of the motor The difference to prevent the vibration of the foundation.

5. Avoid overload

In actual production, pay attention to the actual capacity of the vibrating screen, not to exceed it, overload the machine, and clean the inside of the machine from time to time to prevent the accumulation of residual materials, because this will also affect the vibration frequency of the vibrating screen and cause resonance.

6, adjust the frequency

Preventing the vibration frequency of the vibrating screen from working is the same as the natural vibration frequency of the vibrating screen is the fundamental principle to reduce the resonance phenomenon. The working frequency of the vibrating screen can be changed by the setting of the vibrating motor and the design of the model. The key is to understand the natural vibration frequency of various vibrating screens. As long as the two frequency values ​​of the vibrating screen are set to different parameters, the occurrence of resonance can be avoided.

The influence of vibrating screen resonance

1. The occurrence of resonance will not only lead to longer start-up and shutdown events of the vibration screening machine, but also cause huge noise from resonance.

2. At the same time, it will cause serious damage to the screen plate, screen frame, fasteners and other accessories of the vibrating screen, which will greatly reduce the service life of the vibrating screen.

3. Although the vibration of the vibrating screen will have a certain negative impact on the service life of the vibrating screen, it does not mean that the resonance of the vibrating screen can only be avoided. Similarly, the vibrating screen can also use the resonance phenomenon to increase the time when the material is screened. The effect of this type of vibrating screen is the resonance vibrating screen, referred to as the resonance screen.

The above is the solution to reduce the resonance phenomenon of the vibrating screen. Lzzg is a manufacturer of sand and coal vibrating screens. If necessary, please contact us.