Edge blowing device for lower plate surface of cold-rolling mill

The utility model relates to a cold rolling mill lower plate surface edge blowing device which comprises a bottom plate, electric ejector rods are arranged on the two sides of the upper portion of the bottom plate, the output ends of the electric ejector rods are fixedly connected with a positioning plate, a bearing seat is arranged in the positioning plate, the interior of the bearing seat is connected with a two-way lead screw, one end of the two-way lead screw is fixedly connected with a rotating handle, and the other end of the two-way lead screw is fixedly connected with the rotating handle. The outer portion of the bidirectional lead screw is connected with a threaded seat, a rotating supporting rod is arranged above the threaded seat, the interior of the rotating supporting rod is connected with a rotating rod, the upper portion of the rotating rod is fixedly connected with a U-shaped support, a connecting rod is arranged in the U-shaped support, and the upper portion of the connecting rod is connected