The paper introduces the action,composition,working principle,and using condition of the balance arm device in crane's hoisting mechanism;puts forward the deficiencies existing in common structural types of the balance arm device,and improvement plan;presents the feature and structure of a balance arm device.With the balance arm device ap-plied in cranes in certain steel factory,the paper details the load conditions and design process of major load-carrying parts and points out the problems to be concerned.%介绍了起重机起升机构中平衡臂装置的作用、组成、工作原理及使用条件,指出单倍率起升机构上常用的平衡臂装置结构形式中存在的不足,并提出了改进方案,介绍了一种平衡臂装置的特点和结构。以某钢厂起重机采用的该平衡臂装置为例,论述了主要受力件的受力状况和设计过程,指出了设计中需要注意的问题。
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