Torque wrench self -calibration appearance

The utility model discloses a torque wrench self -calibration appearance, it include a plurality of different ranges sensor unit, workstation, sensor unit positioning seat, sensor unit switching mechanism, elevating system, connecting axle, connecting axle positioning mechanism, actuating mechanism, drive plate, spanner supporting mechanism, take the photograph camera, sound sensor, the next machine and take the host computer of self -calibration software, sensor unit switching mechanism comprises carousel and slewing mechanism, and the sensor unit of a plurality of different ranges places onthe carousel, and slewing mechanism rotates the sensor unit of required range to elevating system's top, then elevating system drive sensor unit rises or descends and cooperates or break away from with the sensor unit positioning seat to realize torque sensor's automatic switch -over. Invention calibration result is accurate reliable, and ability automatic switch -over torque sensor has automaticloading and automatic unin