Ball Mill operating parts that are susceptible to wear are armor and balls. Bearings, bearing lubrication systems and transmissions are also subject to wear. Measure the vibration before starting to repair and shut down the mill. Once the mill is off and the motor is de-energized, the status of all components will be checked and the list of repairs adjusted. When checking the assembly conditions, check the bearing seat, coupling and drum mounting positions, and the gap between the drum or bull gear seat positions.
Roller journal installation horizontal deviation of 0.35 mm per linear meter. The total axial clearance between journal and thrust pad is 0.75 to 1.50 mm. The axial clearance between the collar of the drum expansion bearing and the bushing is 10 to 25 mm. During operation, the ball is subject to wear, resulting in a reduction in its diameter. Balls that reach the minimum allowable diameter are rejected during sorting. The number of balls loaded into the mill should comply with the mill certificate so the ball is weighed during charging.
Fix the armor in the mill housing using bolts that pass through the drum wall. When armor is removed, the drum is rotated using a winch and ribbed pulley, or a special portable gear motor is used. The upper deck is first removed. Use a wedge driven between the plate and the drum wall to remove the plate.
During the plate installation, the lower part of the mill must first be covered, then the mill rotated by 90 ° and the lower roller area covered in the lower position, and the process should be carried out until all the plates have been installed. The plates are also installed with tube helical brackets as the drum rotates.