Self-calibration knife roll

The utility model belongs to the technical field of knife rolls, and particularly relates to a self-calibration knife roll which comprises a top plate, a central processing unit is fixedly installed on the top of the top plate, hydraulic rods are symmetrically fixed to the bottom of the top plate, a connecting plate is fixed to the bottoms of the two hydraulic rods, and a fixing plate is fixed to the position, between the two hydraulic rods, of the surface of the connecting plate. A distance sensor is installed on the surface of the fixing plate. The distance sensor installed on the surface of the fixing plate measures the distance between the roller and a machined material in real time and feeds back signals to the central processing unit, the central processing unit controls the hydraulic rod to drive the connecting plate to move up and down, then the distance between the roller and the material is adjusted and automatically calibrated to a proper distance, and workers can use the device conveniently; and t