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120kg—m定值转矩电扳机是用来拧高强度螺栓的新型电动工具。见照片1。它以电能直接带动,在终拧高强度螺栓时,能产生120kg—m转矩,并自动停机。在毛主席关于“外国有的,我们要有,外国没有的,我们也要有”的教导指引下,自一九六九年初,由上海电动工具研究所、上海电器三厂及交通部大桥工程局三桥处共同协作,在年末试制成功第一期样机五台。一九七○年先后在4021大桥、701大桥钢梁架设时试运转,共计拧紧φ22及φ24的40B高强度螺栓约
120kg-m fixed torque electric trigger is used to screw new high-strength electric tools. See photo 1. It is driven directly by the electric energy, can produce 120kg-m torque and terminate the machine automatically when finishing the high-strength bolt. Under the guidance of Chairman Mao’s guide to “we have foreign countries, we have foreign countries, and foreign countries do not have them, we must also have”. Since the beginning of 1969, the Shanghai Electric Tools Research Institute, the No. 3 Factory of Shanghai Electric and the Bridge Project of Ministry of Communications Bureau III Bridge Office to work together at the end of the trial prototype of the first phase of the successful five. In 1970, 4021 Bridge and 701 Bridge steel girder were set up for trial operation. A total of 40B high strength bolts about φ22 and φ24 were tightened