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[CN 201710287278.5] high load-bearing portal press
[CN 201710287278.5] A high-load portal press Title: A high-load portal press Application number: CN 201710287278.5 Applicant: Pinghu Tongli Machinery Co., Ltd. Application date: 2017-4-27 Patent type: Invention application The present invention provides a high-load portal press, which belongs to the technical field of machinery. It solves the technical problems that the existing portal press cannot realize automatic pressure relief. This high-load door press comprises a frame and an oil cylinder fixed on the frame. The oil cylinder comprises a cylinder body, a piston rod and a piston fixed on the piston rod. One end of the cylinder body is fixed with an end cover. The cylinder body is located inside the end cover. A sealing seat ring is sealed and fixed. The piston is provided with a through hole arranged along the axis of the piston rod. The through hole is provided with a steel ball capable of blocking the through hole, the lower end of the lower ejector rod can protrude relative to the bottom surface of the piston. During the downward movement of the piston, the lower end of the ejector rod can abut against the sealing seat ring and make the ejector rod jack up the steel ball so that the through hole penetrates. A pressure relief hole is opened between the piston and the sealing seat ring, and the through hole can communicate with the pressure relief hole. The invention has the advantage of automatic pressure relief.
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