我矿一台单梁电动桥式抓斗吊车行车机构行星减速箱与外壳连接部分，是用6－M12加弹簧垫埋头螺栓固定。在使用过程中，减速箱因受震动经常出现松动，埋头螺栓被剪断的现象，最后发展到每两天就要处理一次。维修时要电动机及行星齿轮卸下，方能把松动螺栓加固，既费时又费工，高 I mine a single beam electric bridge crane crane driving mechanism Planetary gearbox and the shell connection part is to use 6-M12 plus spring padlock bolt. During use, the gearbox is often loosened due to vibration, countersunk bolts were cut phenomenon, the final development to be dealt with every two days. Maintenance of the motor and planetary gear removed, only to loose bolts reinforcement, both time-consuming and laborious, high