• Name :Screening And Sieving
  • Abstract:

     Vibrating sieve screening quality is poor



Vibrating sieve screening quality is poor

There are many factors affecting the screening effect, including the nature of the material, equipment factors, and operational factors. The reasons for poor screening quality are: mesh hole blockage, screen hole wear, uneven vibrating screen feeding, excessive material on the screen, and insufficient screen angle.

  • 1. The mesh hole is blocked. When the mud content and water content in the feed are high, the material will stick to the mesh hole and block the mesh hole. At this point, the sieve hole should be cleaned first, and then the water spray volume and the screen inclination angle should be appropriately adjusted.
  • 2. The screen hole is seriously worn. When the screen is used for a long time, the screen hole is seriously worn and the screening effect is seriously affected. At this point, the worn screen holes should be repaired. When the wear is very serious, the screen should be considered for replacement.
  • 3. The vibrating screen is not uniform. When the feed tank of the vibrating screen is too narrow, the material cannot be evenly distributed along the entire screen surface, so that the screen surface cannot be effectively utilized, which will affect the screening effect. At this point, the width of the feed chute should be adjusted to make the feed of the vibrating screen uniform.
  • 4. The material on the sieve is too thick. The excessive thickness of the material on the sieve may be caused by the increase of the feed amount, the obstruction of the sieve hole, and the small inclination of the sieve surface. At this time, it should be adjusted according to the specific circumstances.
  • 5. The screen surface angle is not enough. For a circular vibrating screen, the most common reason for the poor screening effect is that the angle of inclination of the screen surface is not sufficient, and it is necessary to raise the rear support seat. In practical applications, the inclination angle of the screen surface is suitable at 20°. Generally, the inclination angle of the circular vibrating screen is selected from 16 to 20°. If the inclination angle is lower than 16°, the phenomenon that the screen is not smooth or the material is rolled upwards may occur. .
  • 6. The direction of motion of the eccentric block is not in the same phase. For linear vibrating screens and high-frequency vibrating screens, the poor screening quality may be related to the direction of motion of the eccentric block, because two sets of eccentric blocks of the same mass are required for self-synchronous reverse rotation, and a single direction of vibration is generated at each moment. The exciting force at a fixed angle with the horizontal direction causes the screen box to reciprocate linearly. If they are not in the same phase, the direction of the exciting force does not overlap with the direction of vibration, and the effect of efficient screening is not achieved.