电动单梁起重机、电动单梁悬挂起重机因其结构紧凑,价格低廉,安装及使用方便等,广受中小型企业特别是民营企业选用,占在用起重机械比例超过70%,仅杭州地区在用量已达上万台。但由于该类起重机大多数采用电动葫芦做为起升机构,悬挂于主梁工字钢下方,随着葫芦上电动小车车轮与主梁下翼缘运行过程中的不断磨损、电 Electric single girder cranes and electric single girder suspension cranes are widely used by small and medium-sized enterprises (SMEs), especially private-owned ones, due to their compact structure, low cost, easy installation and convenient use, accounting for more than 70% of the total lifting trucks used. Only Hangzhou Dosage has reached tens of thousands of units. However, most of these cranes adopt electric hoist as the hoisting mechanism and are hung under the girder of the main girder. As the hoist constantly wears during the operation of the wheels of the trolley and the lower flange of the main girder,