论文部分内容阅读
1.故障现象1台挖掘机工作1700h后,发生动臂从转台上坠落事故。检查发现,动臂与回转平台铰接的右侧铰接耳板断裂,左侧铰接耳板、动臂缸活塞杆等严重变形。发生断裂的部位在铰接耳板加强圆环板焊道边缘,从断裂面可以清晰的看到断裂状态。断口分为裂纹起始点、深锈迹区、浅锈迹区和瞬间脆断区,裂纹起始点处有2mm宽的抛光面。如图1所示。
1. Symptom 1 excavator work 1700h, the boom occurred from the turntable crash. Inspection revealed that the articulated right and left hinged ear plates of the boom and the swivel platform were broken, the left hinged ear plates and the piston rod of the boom cylinder were severely deformed. Fracture site in the hinged ear plate to strengthen the annular plate bead edge, from the fracture surface can clearly see the fracture status. Fracture is divided into the starting point of crack, deep rust area, shallow rust area and instant brittle fracture area, crack initiation point 2mm wide polished surface. As shown in Figure 1.