The seal is seriously worn. If the gap between the broken parts of cement mill becomes smaller, the seal will be squeezed and deformed, and the seal will be seriously worn; Or in the replacement of some worn parts, due to the inconsistency between the replacement cycle of the seal and the wear cycle of the friction parts, the old and new degree of the two is different, which increases the sealing extrusion force of the rubber seal ring, and causes the damage of the seal due to the local deformation and warping.

Aging of seals. The rubber seal is affected by the oil quality, temperature and time in use. In addition, the improper selection of the material for manufacturing the seal ring makes the seal ring lose its elasticity and the sealing state change, which leads to the failure of the cement mill seal.