Butt-welding elbow back-arc reshaping machine

The utility model relates to a butt-welding elbow back-arc reshaping machine which is vertically distributed; a left side wall is connected with a right side wall by a bolt; the right side wall is fixed on a base; the inner sides of the left and the right side walls are welded with cross beams; an oil cylinder is installed on the right side wall; a concave die fixed frame of a reshaping mould is connected on a piston rod of the oil cylinder, and forms a movable pair together with the cross beams; a convex die fixed frame of the reshaping mould is fixed on the left side wall; an oil tank at the right front is welded on the right side wall; a control device and a motor are installed on the oil tank; the oil cylinder, the control device and an oil pump are connected with by oil pipes; a rotating working platform for placing a butt-welding elbow is connected with a stand column and a roller wheel support post; and the height of the rotating working platform can be adjusted by the stand column fixed on the base. T