Hydraulic drive, swinging tool holder. The whole frame welding is strong and durable, the upper tool holder return device adopts nitrogen cylinder type, and the return speed is fast. With stepless adjustment stroke function. The clearance of the upper and lower blades is adjusted by the handle, and the clearance uniformity of the blades is easily adjusted. Protective grating and electrical interlock ensure safe operation. Backward high contrast liquid crystal display, according to the blade gap to determine the rear stop material positioning value, back stop function, product storage memory amount of 36 sequence, internal storage memory measurement of 100 sequence, equipped with synchronous material trolley, can prevent plate bumping edge corner.