Circle shear changing device

The utility model discloses a circle shear changing device, which is arranged above a cutter shaft of a circle shear and comprises a base, a screw rod, a transmission piece and three grippers, wherein the base is fixedly arranged on the cutter shaft of the circle shear; the screw rod is vertically arranged on the base through a bearing; the screw rod is sleeved by the transmission piece in threaded connection therewith; the three grippers are uniformly arranged in the circumferential direction of the transmission piece; each gripper comprises a gripper rod and a gripping head correspondingly connected with the gripper rod; one end of each gripper rod is rotatably connected with the transmission piece; an included angle is formed between the screw rod and the other end of each gripper rod which obliquely extends downwards; and each gripping head includes a first toe, a second toe and a third toe which are connected into a claw, and the first toe serves as an extension section of the corresponding gripper rod.