Vibrating screen is an indispensable equipment in the gravel sand production line, which plays the role of screening and grading of sand and stone. Users can control the speed of screening by adjusting the vibration screen amplitude. What to do when the amplitude is small? What causes it?
The main reasons for the small vibration screen amplitude in actual production are as follows:

Vibrating screen
1, the power supply voltage is insufficient
For example, the vibrating screen is designed according to 380V three-phase, if the line is not connected according to the regulations, the voltage is insufficient, which will cause the vibrating screen amplitude to be small.
2, the eccentric block is too little
The amplitude can be controlled by increasing or decreasing the number of eccentric blocks, and the amplitude can be increased by increasing the number of eccentric blocks.
3, the Angle of the eccentric block is too small
If the vibrating screen is matched with a vibration motor, the Angle of the eccentric block at both ends of the motor shaft will also affect the amplitude, the Angle becomes smaller, the exciting force becomes larger, the amplitude becomes larger, and the amplitude becomes smaller, so the amplitude can be adjusted by changing the Angle.

4,Large amount of feed and accumulated material
If the stone material transported to the screen surface exceeds its bearing range, the remaining material or accumulation in the screen surface and the funnel under the screen is too much, resulting in an increase in the equipment load and affect the amplitude. At this time, it is necessary to stop, reduce the material on the screen to the normal range, and then start. In addition, the particle size of the material is directly related to the calculation result of the vibration sieve amplitude.
5, the spring design is unreasonable
We know that the vibrating screen is mainly composed of vibrator, screen box, supporting device, transmission device and other parts, the spring is an important part of the support device, so in the design of the spring, the net variable of the spring is less than the height of the device, otherwise, it will cause the vibrating screen amplitude is small; However, 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
1) The motor or electrical components are damaged
First check the motor, if the motor is damaged, replace the motor; Secondly, check the electrical components in the control line. If the electrical components are damaged, they need to be replaced.
Add: There are many reasons for motor burning: loose anchor bolts, improper installation, adjustment of eccentric block, weak seal of protective cover, ambient temperature, etc., will cause motor burning. For each reason, the treatment method can refer to the article “vibrating screen yaw, can not start, screen damage how to do? Remember these 7 types of fault treatment methods, do not panic.”
2) Vibrator failure
Check the viscosity of the grease in the vibrator, add the appropriate grease, and then check whether the vibrator is faulty, and repair or replace it in time.
It should be noted that in the process of adjusting the vibration screen amplitude, whether it is increasing the weight of the eccentric block, or adjusting the Angle of the eccentric block, or increasing or reducing the counterweight block on the flywheel and belt wheel (shaft eccentric vibrator), the vibration source of the vibrating screen (exciter or vibration motor) must be the same, otherwise it will cause equipment damage.

In production, the screening efficiency of the vibrating screen is related to many factors, such as material properties, equipment structure and various performance parameters. Aside from the hard factors of material properties and equipment structure, the parameters of amplitude, vibration frequency, vibration direction Angle, screen surface inclination Angle and ejection Angle have a great impact on the production efficiency of the vibrating screen, and pay more attention to these parameters when installing and debugging.