When there is a slight "full grinding" phenomenon, the grinding sound of the vertical roller mill changes from clear to low, the discharge volume at the end of the vertical roller mill decreases, and the air pressure at the inlet and outlet of the middle unloading drying mill increases; when the "full grinding" phenomenon is aggravated When the grinding sound of the vertical roller mill disappears completely, the current of the main motor is only about 70% of the normal value, and the discharge volume at the tail end of the vertical roller mill is greatly reduced; and when the phenomenon of "full grinding" is extremely heavy, the head end of the vertical roller mill returns material, and the tail end of the vertical roller mill returns.

Unexpectedly, there is no air at the outlet of the air extractor.What causes the "full grinding" of the vertical roller mill? Sudden increase of the feeding amount makes the grinding capacity of the steel balls unable to adapt to the increased feeding amount in time.

The properties of the grinding material change, such as the particle size becomes larger, the hardness becomes larger, etc. If the feeding amount is not reduced in time, a large number of unqualified materials will be caught in the gaps of the partition board, resulting in blockage, so that the materials cannot be discharged in time.