In this case, Raymond mill is likely to cause "belly swelling", that is, the negative pressure in the cylinder is too large and the grinding effect is lost; However, if the ore feeding amount is insufficient, the ore discharge particle size of Raymond mill will become smaller and the sand return amount will be reduced accordingly.

In serious cases, the lining plate and grinding medium will make an obvious impact sound, resulting in the endless loss of grinding medium and lining plate.

When the ore feeding amount remains unchanged, the increase or decrease of ore feeding particle size will also be similar to the above situation. Therefore, the ore feeding quantity and particle size should be continuous, uniform and stable at a high level.