1. Regularly check the wear of the inner cone to prevent coal powder from entering the inner cone after wearing through the inner cone, forming deposits and detonating. If leakage of pulverized coal is found, compressed air should be used to absorb it immediately and the inner cone should be kept sealed.

2. Since coal powder is easily deposited at the top cap cone of the inner cone, after stopping the grinding, continue pumping for 20 minutes to eliminate the deposits and prevent natural detonation.