Device for replacing shear blade of circle shear

The device comprises a lower support and an upper support, a limiting outer ring is arranged at the top of the lower support, a plurality of limiting bolts are annularly distributed on the side wall of the limiting outer ring in a threaded connection mode, a nut is fixed to the lower portion of the lower support, a threaded rod is in threaded connection with the nut, and the threaded rod is in threaded connection with the limiting outer ring. A supporting block used for supporting the circle shear is arranged at the top of the screw rod, a fixing rod is fixed in a groove formed in the outer side of the lower support, and a transmission mechanism is arranged at the top of the fixing rod. According to the disc shear, the guide rod, the lead screw, the motor and other structures are arranged to be used in cooperation, the motor can drive the lead screw to rotate so as to drive the whole upper support to move up and down, and in the process, the shear blade is separated from the disc shear body part; the labor in