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一台ZL40GH型装载机摇臂销轴断裂后,造成悬挂摇臂的一个耳环变形。虽经校正,由于摇臂、拉杆和铲斗的不平衡性,更换后的新销轴仍然发生断裂。断裂每次都发生在销轴的润滑道中间。 从销轴断裂的外观看,断口平齐光亮,且与正应力垂直,断口上有放射纹,截面的收缩很小;从宏观上看,为无明显塑性变形的脆性断裂。因此认为,销轴为疲劳断裂。 该装载机在山洞内铲装石料,工作条件相当恶劣(道路条件很差,并经常是满载或短时超载工作,且频繁制动、停机和起步),使机器受到很大的振动和冲击;销轴在变载
A ZL40GH loader rocker pin broken, causing the suspension arm of an earring deformation. Despite the correction, due to the unbalance of the rocker arm, tie rod and bucket, the new pin after replacement still breaks. Fractures occur each time in the middle of the lubrication groove of the pin shaft. From the appearance of the broken pin shaft, the fracture is flush and bright, and perpendicular to the normal stress. There is a radial pattern on the fracture surface and the contraction of the cross section is small. From a macroscopic point of view, there is no brittle fracture with obvious plastic deformation. Therefore, the pin is considered to be fatigue fracture. The loader shovels stones in caves and is subject to rather harsh working conditions (poor road conditions and often full or short-time overloading with frequent braking, shutdowns and starts) that cause severe vibration and shock to the machine; Pin in the load