Top-locking positioning device for side-cutting scissor seat

The invention discloses a top-locking positioning device for a side-cutting scissor seat, and the device comprises a cross beam, wherein the front end of the cross beam is fixed on a bottom plate. A bonding surface between the cross beam and the bottom plate is provided with a gasket group, and the bottom plate is disposed on the top surface of an operating side cutter seat. The rear end of the cross beam and a base on a transmission side cutter seat form a sliding pair, and the interior of a groove of a front boss of the base is provided with a copper liner plate. The copper liner plate is fixed on the base through a first sunk screw. The top surface of the groove of the front boss of the base is provided with a locking hydraulic cylinder, thereby forming a sliding way of the sliding pair. Two sides of the upper surface of the lower edge of the tail part of the cross beam are respectively provided with a steel sliding plate, and the steel sliding plate is fixedly connected with the cross beam through a second sunk screw, thereby forming a sliding body of the sliding pair. The device locks the cross beam through the operation of the locking hydraulic cylinder, thereby enabling the cutter seats at two sides to be connected together to form a body, greatly improving the capability of resisting distortion deformation of the cutter seats, guaranteeing the stability of shear edge interval values during the cutting of a steel plate, and greatly improving the side-cutting quality.