Belt pre-pulling device for zipper teeth rowing machine

The utility model discloses a belt pre-pulling device for a zipper teeth rowing machine. The belt pre-pulling device comprises an air cylinder and a mounting frame, wherein the mounting frame adopts a rectangular hollow frame structure and comprises an upper frame, a lower frame, a left frame and a right frame; the upper frame is provided with three mounting holes; a through hole I is formed in the central position of the lower frame; sliding grooves are respectively formed in the middle of the left frame and in the middle of the right frame; guide rails are arranged in the front side wall and the rear side wall of each of the sliding grooves of the left frame and the right frame; the air cylinder comprises a cylinder body, a pull rod and a cross rod; the upper end of the cylinder body is mounted on the lower frame of the mounting frame; the lower end of the pull rod is hinged to a piston inside the cylinder body, the upper end of the pull rod is fixed in the middle of the cross rod; bearings are respectively mounted at the left end and the right end of the cross rod and are matched with slide rails; the cross rod is vertically mounted at the upper end of the pull rod. The belt pre-pulling device solves the problem that in the belt pre-pulling process, a cloth belt is clamped on a winding head and cannot be pulled, so that the production process is more stable and reliable, the efficiency is improved, and the product quality is ensured.