Self-adaptive working well bull-pulling device

The utility model provides a self-adaptive working well tractor device. The device comprises a front traction disc and a rear traction disc, a rotating shaft is rotationally arranged between the fronttraction disc and the rear traction disc; an adjustable assembly is fixed to the rotating shaft and comprises a supporting disc and at least two adjustable arc-shaped blocks, installation hole queuescorresponding to the adjustable arc-shaped blocks in a one-to-one mode are evenly distributed on the supporting disc in the circumferential direction, adjustable rods are fixed to the adjustable arc-shaped blocks, and the adjustable rods are detachably connected to the supporting disc through the bolts. Before use, the position of the adjustable rod on the supporting disc can be moved in the radial direction according to the pipe diameter of a calandria, then the adjustable rod is fixed to the supporting disc through a bolt, adaptive adjustment is achieved, convenience and rapidness are achieved, the purchasing and st