Calibrating device for torque stretcher

The utility model relates to a torque stretcher calibration device which comprises a first coupler, a limiting sleeve, a limiting rod, a rack, a gear and a torque sensor. The limiting sleeve is fixed in the machine shell in the vertical direction, and an opening is formed in the limiting sleeve in the vertical direction. The limiting rod is adaptively sleeved in the limiting sleeve, the mounting seat extends outwards from the opening, and the rack is fixed on the mounting seat; the first coupler is fixed to the upper portion of the limiting rod and extends out of the shell. A rotating shaft at one end of the gear is rotationally arranged on the inner wall of the shell and extends outwards to form an adjusting knob, a rotating shaft at the other side is connected with a torque sensor through a second coupler, and the torque sensor is mounted on the inner wall of the shell through a shaft seat; the first coupler is in transmission connection with an output shaft of the hydraulic oil cylinder. A pressure sensor