For the wear problem, the traditional solution is repair welding or machining and repairing after brush plating, but both have certain drawbacks: the thermal stress generated by the high temperature of repair welding cannot be completely eliminated, and it is easy to cause material damage and cause the planetary gear reducer components to bend. Or break.

　　However, electric brush plating is limited by the thickness of the coating, which is easy to peel off, and the above two methods use metal to repair the metal, which cannot change the "hard-to-hard" coordination relationship. Under the combined action of various forces, it will still cause re-wear.For some large bearings, it cannot be solved on-site.

　　For the leakage problem of planetary gear reducer, the traditional method needs to disassemble and open the reducer, replace the gasket or apply sealant, which is time-consuming and laborious, and it is difficult to ensure the sealing effect, and leakage will occur again during operation.

　　In the long-term operation of the reducer, failures such as wear and leakage will often occur. The most important ones are:

　　1. Wear of the bearing chamber of the planetary gear reducer, including the wear of the housing bearing box, the bearing chamber of the box bore, and the bearing chamber of the gearbox.

　　2. The shaft diameter of the gear shaft of the reducer is worn, and the main wear parts are the shaft head and keyway.

　　3. The bearing of the reducer drive shaft is worn.

　　4. The joint surface of the planetary gear reducer leaks.