First, the missing teeth of the big gear of the cement ball mill can be processed into the shape of missing teeth by selecting the metal with the same material as the gear, and then the teeth of the big gear can be filled with this material.

1. Turn the damaged gear teeth to the upper side, level the fracture with a flat shovel, and then drill holes with a bit with a diameter slightly smaller than the width of the dressing surface, with the hole spacing of 0.9- 1.2 times the hole diameter. When the tooth profile damage is small, the hole spacing can be slightly larger. At the same time, tap tapping matching the aperture is selected, and the depth is 1.5-2.0 times the aperture. Screw a bolt in each hole with the depth of the hole and the height of the tooth, and make the tooth shape by surfacing after fastening. Finally, it is polished by a manual grinder to make the new welding tooth profile basically consistent with the original tooth profile, which is an emergency treatment method. Pay attention to empty materials and polished bodies before repair, and avoid using hammers, flat shovels and gas welding during shaping. In order to ensure the repair quality, the cast steel gear ring is cold welded and the cast iron gear ring is hot welded. If possible, the tooth profile of the side contacting the pinion can be made in advance and welded on the bolt.

2. Repair with bolts and splints.

Second, if there is no material that can be processed into missing teeth, it can only be scrapped.

Three, the cement ball mill is a horizontal cylinder rotating device, driven by gears. The centrifugal force generated by the rotation of the cylinder brings the steel ball to a certain height and then falls. Cement ball mill is used to grind cement raw materials, which can be divided into dry method and wet method.