Floating guide hydraulic cylinder

Abstract

The invention relates to a novel hydraulic cylinder with a floating guide sleeve. The hydraulic cylinder comprises a piston, a piston rod and the floating guide sleeve which are arranged in the hydraulic cylinder, and a spring for connecting the floating guide sleeve with a cylinder head. When the piston rod in the cylinder is long, the floating guide sleeve can have a good bearing guide position under the action of the spring, so that the rigidity of the piston rod is effectively improved; and the floating guide sleeve has automatic centering capability, and achieves a composite guide effect with the piston rod and the cylinder head, so that friction scratches between the piston and the inner wall of a cylinder barrel, and between the piston rod and the cylinder head are reduced, and leakage is reduced. The invention has the advantages that: the hydraulic cylinder has high guide property, sealing property and stability, the rigidity of the hydraulic cylinder is effectively improved, the material consumption of the hydraulic cylinder is reduced, and the like.

Description

Technical field [0001] The invention relates to a novel hydraulic cylinder with a floating guide sleeve, which is especially suitable for application in the field of long-stroke high-pressure hydraulic cylinders. technical background [0002] At present, long-stroke hydraulic cylinders have been widely used. Due to the long stroke, when subjected to a large thrust, the piston rod will be bent and deformed because it cannot maintain the original status quo, and a large bending moment will be generated in the longitudinal direction to generate a large bending stress. If the allowable stress or deformation exceeds the allowable range, it will cause the hydraulic cylinder piston rod to become unstable, and even break in severe cases. When the bending deformation of the piston rod is large, the seal at the end of the hydraulic cylinder and the piston will deform greatly, and it is easy to rub and scratch the inner wall of the cylinder barrel. When it exceeds the allowable range,...

AI Technical Summary

Problems solved by technology

Due to the long stroke, when subjected to a large thrust, the piston rod will be bent and deformed because it cannot maintain the original status quo, and a large bending moment will be generated in the longitudinal direction to generate a large bending stress. If the allowable stress or deformation exceeds the allowable range, it will cause the piston rod of the hydraulic cylinder to become unstable, and even break in severe cases

When the bending deformation of the piston rod is large, the seal at the end of the hydraulic cylinder and the piston will be greatly deformed, and it is easy to rub and scratch the inner wall of the cylinder barrel. When it exceeds the allowable range, it is easy to cause hydraulic oil leakage

The support of the current long-stroke hydraulic cylinder is mostly the external support of the piston rod. With the retraction of the piston rod, the role of the support is no longer obvious. At this time, the large deformation of the piston rod inside the hydraulic cylinder may cause instability and failure. leakage

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