Pressing plate sliding type welding clamp

A pressing plate sliding type welding clamp is composed of elastic roller supports, a bottom plate, a movable pressing plate, open washers and tensioning oil cylinders. The elastic roller support frames and the tensioning oil cylinders are installed on the bottom plate through bolts, the groove bottom of the movable pressing plate is supported on rollers of the elastic roller support frames, and the open washers are clamped into piston rod grooves of the tensioning oil cylinders. Each elastic roller support frame is composed of a hexagon-socket cylindrical-end set screw, a nut, a shaft retainer ring, a roller, a pin shaft, a sliding column, a spring and a support seat, wherein the sliding column and the spring are arranged in a support seat hole, the hexagon-socket cylindrical-end set screw is screwed into a screw hole of the support seat, and a cylindrical part extends into a sliding column groove. Each tensioning oil cylinder is composed of a base, a cylinder barrel, a piston rod, a gland, an oil port I, an