Fast die replacing device for automobile silencer production line longitudinal buckle sewing machine

The utility model belongs to a fast die replacing device for an automobile silencer production line longitudinal buckle sewing machine. The fast die replacing device comprises the silencer production line longitudinal buckle sewing machine (22), a knurling sliding rail (20) and a top beam (21), and is characterized in that a first fixing frame (1) is installed at the right end of the silencer production line longitudinal buckle sewing machine (22), a ball screw bearing supporting base cushion plate (15) is fixed on the first fixing frame (1), a single nut rolling ball screw (6) is movably arranged in a bearing of a ball screw bearing supporting base assembly (7), a rectilinear sliding rail assembly (3) is arranged on a sliding rail lower cushion plate (4), and a second fixing frame (13) and a stand column (14) are arranged on a sliding rail upper cushion plate (5). A positioning plate (8) is arranged on the second fixing frame (13), a plurality of stop blocks (9) and a plurality of idler wheel strips (11) are