挖掘机天轮轴是支承天轮双向滚动的定轴,也是承受提升力的重负荷轴,由于受挖掘机提升力超负载(挖底根)作用下和设备操作人员误操作,多次使天轮受交变弯曲应力的作用,导致天轮轴断裂。1天轮轴的点检由于天轮轴长期受交变弯曲应力的作用易发生断裂,若天轮轴断裂后又不能及时发现, Excavator Tianzhe axis is supporting the two-way rolling wheel axis, but also to withstand the lifting of the heavy-duty shaft, due to excavator lifting force overload (dug the root) under the action of equipment operators and misuse, make the days round By the role of alternating bending stress, leading to the wheel shaft fracture. 1-day wheel axle check because of the long-term days by the alternating bending stress days the role of fracture prone to fracture, if the days after the fracture can not be found in a timely manner,