Two-stage linear constant-speed single-acting cylinder

The utility model relates to a two-stage linear constant-speed single-acting cylinder. The cylinder bottom is in threaded connection with the left end of a cylinder body I and fastened by a fastening screw, a cylinder body II is sleeved in the cylinder body I, a left end excircle is matched with an inner hole of the cylinder I, and a sealing part I is arranged in the left end excircle. A right-end secondary excircle is matched with an inner hole of a guide sleeve I, a venting plug is installed on a right-end primary excircle, and a sealing IV is arranged in the inner hole. The guide sleeve I is welded at the right end of the cylinder body I, and a sealing part III is arranged in the inner hole. A press cover excircle is in threaded connection with the left end of the cylinder body II, and an oil pipe is positioned in the inner hole and fixed by a locking nut. The two-stage working area of the two-stage linear constant-speed single-acting cylinder can be manufactured to be equal. On the certain oil feeding con