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1.故障现象1台在采石场作业的20t级挖掘机,当其铲斗装满石料正在提升动臂准备装车时,动臂前端突然断裂。该挖掘机动臂主体用钢板焊接而成,动臂前端为焊接在动臂主体上的铸钢件,铸钢件的2个侧板与斗杆销连接,断裂部位为该铸钢件的侧板,且为脆性断裂,如图1所示。该挖掘机购置仅3个月,购机时为该机配装的是重型岩石铲斗,一直在该采石场从事挖掘岩石及装车作业,工作时间表显示该机已工作1200h。
1. Symptom A 20t excavator operating at a quarry was suddenly broken when the bucket was filled with stones and the boom was being lifted for loading. The main body of the excavator boom is welded with a steel plate. The front end of the boom is a cast steel welded to the boom body. The two side plates of the cast steel are connected with the stick pin. The fracture site is the side of the cast steel Plate, and brittle fracture, shown in Figure 1. The excavator purchased only 3 months, when the purchase of the machine is equipped with a heavy rock bucket, the rock has been engaged in the quarry and loading operations, work schedule shows that the aircraft has been working 1200h.