Gearbox back clearance detection device

The utility model discloses a gear box back clearance detection device, a gear box is detachably connected with a fixed motor, the fixed motor is provided with a motor output shaft, the gear box is provided with a gear box input end and a gear box output shaft, the motor output shaft is connected with the gear box input end, and the gear box output shaft is connected with the gear box input end. The gear box back clearance detection device comprises a gear box clamp used for clamping the gear box and the fixed motor, a fixed motor used for controlling a gear in the gear box to be stuck and rotate, and a detection device used for detecting the back clearance of the gear box, the detection motor is provided with a motor shaft and an encoder for detecting the rotation angle of the motor shaft; the conversion chuck is used for connecting the gearbox output shaft and the motor shaft, and a plurality of fixed hanging points are evenly distributed on the conversion chuck in the circumferential direction; the weight