1. Screen hole blockage. When the mud content and water content in the feed are high, the material will stick to the sieve hole and block the sieve hole. At this time, the sieve hole should be cleaned first, and then the spray amount and the inclination angle of the sieve surface should be adjusted appropriately.
2. Serious wear of sieve hole. When the screen is used for a long time, the wear of the screen hole will be serious and the screening effect will be seriously affected. At this time, the wear screen hole should be repaired. When the wear situation is very serious, the replacement of screen mesh should be considered.
3. The feed of sieve is not uniform.When the feeding trough of the sieve is too narrow, the material can not be uniformly distributed along the whole sieve surface, which makes the sieve surface can not be used effectively, and will affect the screening effect. At this time, the width of feeding trough should be adjusted to make the feeding of sieve uniform.
4. Material on screen is too thick. The excessive thickness of material on screen may be caused by the increase of feeding quantity, the blockage of screen hole and the small inclination angle of screen surface. At this time, it should be adjusted according to the specific situation.