沃尔沃EC450型挖掘机的大臂是连接挖掘机主体与小臂的重要零件,大臂与小臂、主体通过销轴连接。由于挖掘机常年在室外工作,工作环境恶劣,时常有泥水沙石相伴,加上有些操作人员只重产量而缺少必要的设备维护和保养,致使挖掘机大臂上的销孔极易损坏。常见的失效形式有磨损、点蚀、胶 Volvo EC450 excavator’s boom is connected to the excavator main body and arm of the important parts, arm and arm, the main body connected by a pin. As the excavator perennial work outdoors, poor working conditions, often accompanied by mud and sand, together with some operators only heavy production and the lack of necessary equipment maintenance and repair, resulting in the excavator boom pin hole easily damaged. Common forms of failure wear, pitting, glue