Pneumatic wrench for electrolytic aluminum lifting equipment

A pneumatic wrench for electrolytic aluminum lifting equipment is arranged on a lifting frame and comprises a pneumatic motor, a speed reducer, a universal connecting shaft and a sleeve which are sequentially connected. The speed reducer is characterized in that the speed reducer comprises a box body, an output frame, an input shaft and transmission assemblies, the output frame is rotationally matched with the box body, the input shaft is rotationally installed in the box body, a first gear is installed at the end of the input shaft, and the transmission assemblies are evenly distributed on the output frame in the circumferential direction of the center of the input shaft; each transmission assembly comprises an eccentric shaft and two cycloidal gears, the eccentric shaft is rotatably installed on the output frame, a second gear meshed with the first gear is arranged on the eccentric shaft, two symmetrically-arranged eccentric positions are formed on the eccentric shaft, the two cycloidal gears are installed