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Ball mill maintenance standards: 1. The machined surfaces on the two bearing bases must be at the same level; the allowable deviation between their centers is 1 mm. The deviation in the alignment of the longitudinal center lines should not exceed 0.5 mm, while the deviation in the alignment of the transverse center lines should be 0.5 mm per meter. 2. The spherical contact surface of the tile seat should have a uniform contact angle ； Not less than 1–2 points per 50×50 mm2 ； The contact angle between the hollow shaft and the bearing shell should be 90°–100°, with no fewer than 2 contact points per square inch; the clearances on both sides of the shaft journal in the bearing should be approximately equal. 3. The mating surface between the mill cylinder flange and the front end cover must ensure good contact; no gaskets are allowed. The allowable deviation in the out-of-axisness of the two hollow shafts is less than 0.8 mm. During the connection, assembly, and alignment of the large gear ring and the cylinder end cover, proper thrust fixation must be ensured, and positioning pins must be installed; the radial deviation of the gear ring shall not exceed 0.5 mm, while its axial deviation shall not exceed 0.84 mm. 4. When installing the liner of the ball mill, the end cover should be installed first; the liner of the cylinder should be installed starting from the inlet, in accordance with the installation requirements. All screws must be tightened evenly to prevent leakage. There should be no gaps in the fit of the rubber gaskets; any gaps must be sealed with sponge. 5. The center line of the pinion gear must be parallel to the center line of the gear wheel, with a deviation of no more than 0.2 mm per meter. The tip clearance is 1/4 module, while the side clearance is 1.06–1.8 mm. The contact area between the tooth surfaces of the ball mill must be at least 50% of the tooth length and 40% of the tooth height. 6. The coupling used for connecting the reducer, motor, and drive shafts must have a high degree of coaxiality; the deviation of the center lines should not exceed 0.3 mm, and the inclination of the center lines should be less than 1/1000. Main wear-based rejection criteria: 1. The wear of the bearing shell exceeds 1/3 of its thickness. 2. The wear amount on the surface of the pinion gear should not exceed 30% of the tooth thickness; for the gear teeth of the large ring gear, the wear amount exceeding 25% of the tooth thickness allows for use after reshaping, but the gear should be discarded once the wear reaches 1/2 of the tooth thickness. 3. The torsional deformation of the ring gear rim shall not exceed 7.5 mm. 4. The hollow shaft should be replaced when grooves or scars appear on its outer surface, or when local wear on its inner circular surface causes deformation or cracks.