挖掘机在使用过程中，往往会出现回转装置与回转平台之间连接松动、紧固螺栓弯曲甚至折断的现象。特别是回转装置经拆卸再装回回转平台以后，这一现象更为严重，甚至达到当日紧固当日就松脱的程度。此现象不但影响挖掘机的正常工作，还缩短回转小齿轮和回转大齿圈的使用寿命。 Excavators in the use of the process, there will often be loose rotation between the rotary platform and the connection between the device, fastening bolts bent or even broken phenomenon. This is especially true when the slewing device is disassembled and reinstalled on the swivel platform, even to the point of being loosened on the same day of fastening. This phenomenon not only affects the excavator’s normal work, but also shortens the service life of revolving pinion and revolving gear ring.