WD400型电动挖掘机(如图1所示),是某石灰石矿的主要采掘设备,常在野外、高粉尘的环境中运行。该机的生产任务是将爆破后产生的石料铲运装车,其铲斗使用频率较高。铲斗工作是通过小齿轮带动滚筒齿轮回转使钢丝绳在滚筒上反复正卷、反卷实现的,钢丝绳滚筒由同一 The WD400 electric excavator (shown in Figure 1) is the main mining equipment for a limestone mine and is often operated in the open air and in dusty environments. The machine’s production task is to produce the stone after blasting truck loader, the bucket with a higher frequency of use. Bucket work through the pinion gear drum gear rotation so that the rope is repeated on the drum roll, rewinding achieved, the rope drum by the same