The vibrating screen is an indispensable equipment in the sand and gravel production line, which can screen and classify the stone. The small amplitude of the vibrating screen will affect the screening efficiency. In the design of the vibrating screen, for the convenience of users, the speed of screening can be controlled by adjusting the amplitude. However, if you do not adjust it according to the regulations, it will cause unnecessary losses and affect work efficiency. . So what will cause the vibrating screen to have a small amplitude, and how to adjust it?
1. The main reasons for the small vibration amplitude of the vibrating screen are as follows:
1. Insufficient power supply voltage
For example, the vibrating screen is designed according to 380V three-phase electricity. If the wiring is not connected according to the regulations, the voltage will be insufficient, which will cause the amplitude of the vibrating screen to be too small.
2. Too few eccentric blocks
Control the amplitude by increasing or decreasing the number of eccentric blocks. You can try to increase the number of eccentric blocks to increase the amplitude.
3. The included angle of the eccentric block is too small
If the vibrating screen is equipped with a vibrating motor, the angle between the eccentric blocks at both ends of the motor shaft will also affect the amplitude. The smaller the angle, the larger the exciting force and the larger the amplitude. to adjust the amplitude.
4. The feeding volume is large and the accumulated material is large
If the stone material delivered to the screen surface at one time exceeds its bearing range, there will be too much material remaining or accumulated in the screen surface and the undersize funnel, which will increase the load on the equipment and affect the vibration amplitude. At this time, it is necessary to stop the machine first, reduce the material on the screen to the normal range, and then start it. In addition, the particle size of the material is directly related to the calculation result of the vibrating screen amplitude.
5. Spring design is unreasonable
We know that a vibrating screen is mainly composed of a vibrator, a screen box, a support device, a transmission device, etc. The spring is an important part of the support device, so when designing the spring, the net variable of the spring must be less than the height of the device, otherwise, it will The vibration amplitude of the vibrating screen is small; but if the net variable of the spring is too large, it may cause the body to break away from the spring.
6. Reasons for equipment failure
The failure of the motor and vibrator will affect the vibration amplitude of the vibrating screen, and it needs to be repaired and replaced in time.
2. The method of adjusting the amplitude of the vibrating screen
1. When the vibrating screen cannot meet the requirements of the screening operation during operation, its amplitude can be adjusted.
2. If the vibration source is an exciter, the weight of the eccentric weight can be increased (decreased) (increase or decrease the secondary eccentricity).
3. If it is a vibration 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 will become larger and the amplitude will become larger; The smaller the force, the smaller the amplitude.
4. For the shaft eccentric vibrator, the counterweight flywheel and the counterweight on the pulley can be increased or decreased to increase or decrease the vibration amplitude of the vibrating screen.
5. Another note: the vibration sources (vibrator or vibration motor) on the vibrating screen must be adjusted in the same amount, otherwise the equipment will be damaged.
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