Crane reducer is an important institution , whose efficiency of the transmission affects the efficiency of crane .Detecting the input and output torque of reducer is an indirect way for studying reducer efficiency .Based on the work state of reducer , it designs a strain type torque measurement system .This system can measure the input and output torque of reducer when crane is working , and get the efficiency of the transmission for reducer .%减速器是起重机的一个重要机构，其传动效率影响着起重机的工作效率。测量减速器的输入与输出扭矩是间接研究减速器效率的一种方式。基于减速器工作状态，设计出一种应变式扭矩测量系统，在减速器处于工作状态时测量其输入输出扭矩，得到其工作状态下的机械传动效率。
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