A double-acting multi-stage hydraulic cylinder with a solid piston rod

Abstract

The invention relate to a double-action multistage hydraulic oil cylinder with a solid piston rod. The hydraulic oil cylinder comprises a first-stage cylinder sleeve, pistons, the piston rod and a plurality of stages of inner cylinder sleeves including a tail-stage cylinder sleeve. The piston rod is arranged in the tail-stage cylinder sleeve and is a solid rod. An oil feeding hole is arranged at the bottom end of the first-stage cylinder sleeve, and an oil discharging hole is arranged at the other end. A piston is fixed outside one end of each stage of inner cylinder sleeve close to the oil feeding hole, each stage of inner cylinder sleeve is provided with an oil guide hole which is a through hole communicating the inside and the outside of the inner cylinder sleeve, two outlets are located on the same side of the pistons and arranged , the outlet on the outer wall is close to the pistons, and the outlet arranged on the inner wall is arranged at the end far away from the piston. An oil pipe of the oil cylinder is not stretched, shortened or bended with reciprocating movement of the tail-stage piston rod, so that the oil cylinder prevents the oil pipe from being collided and interfered with the tail-stage piston rod in reciprocating movement and being abraded. The piston rod is of a solid structure, and is better in rigidity, low in processing cost and compact in radial size.

Description

technical field [0001] The invention relates to a hydraulic cylinder, in particular to a double-acting multi-stage hydraulic cylinder with a solid piston rod. . Background technique [0002] For multi-stage double-acting oil cylinders, the oil inlet and outlet ports are all or one of them set on the extended end of the hollow piston rod, such as the disclosed technology named "Double-acting multi-stage hydraulic cylinder" (authorized notification number CN 201763722U). A structure, which includes outer cylinder welding, lifting oil port and retracting oil port, the outer cylinder welding is equipped with a first-level guide sleeve, a first-level seal, a first-level piston assembly, a second-level guide sleeve, and a second-level seal. Pieces, secondary piston assembly, rod plug guide sleeve, rod plug seal and rod plug welding; lift oil port and retraction oil port are fixed at one end of the rod plug welding; primary piston assembly and secondary piston The far oil hole A ...

AI Technical Summary

Problems solved by technology

With this structure, the oil pipe is elongated, shortened and bent with the reciprocating movement of the piston rod, and the oil pipe and the reciprocating final piston rod are prone to collision interference and wear

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