液压挖掘机工作环境恶劣,工作装置作为主要的受力部件,其结构的耐久性对挖掘机整体性能、工作可靠性和安全性有重要的影响.大臂作为工作装置的主要受力部件其强度和使用寿命具有举足轻重的作用.通过对大臂结构、受力情况及开裂原因进行分析,找到了影响开裂的主要因素;针对大臂开裂,提出了改进方案,加强了内部筋板和中轴套筒强度,并组织实施,取得了良好效果.%The working environment of hydraulic excavator is bad, the working device is the main stress part. The durability of its structure has important influence on the overall performance, reliability and safety of the excavator. As the main stress part of the working device, the large arm plays an important role in its strength and service life. By analyzing the structure, stress and cracking of the large arm, the main factors affecting cracking are found. Aiming at the cracking of the large arm, the improvement scheme is put forward, strengthening the strength of the internal reinforcing plate and the shaft sleeve, and carrying out implementation, the good result is obtained finally.
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