Double-purpose through hole type four-level oil cylinder

Abstract

A double-purpose through hole type four-level oil cylinder comprises an outer cylinder barrel, a cylinder bottom, a core tube assembly and through hole type middle cylinder barrels, wherein the core tube assembly is composed of an oil tube, an end cover and a piston, an extending oil opening and a retracting oil opening are formed in the end cover, and the extending oil opening is communicated with an inner cavity of the oil tube; chambers are formed between the outer cylinder barrel and the middle cylinder barrel adjacent to the outer cylinder barrel, between the adjacent middle cylinder barrels, and between the oil tube and the middle cylinder barrel adjacent to the oil tube, and an oil passing hole is formed in each middle cylinder barrel and communicated with the two corresponding adjacent chambers; the portion, close to the cylinder bottom end, of each middle cylinder barrel is provided with a piston structure, and gaps are formed between the piston structures and the piston and between the piston structures and the cylinder bottoms respectively and form a chamber together; limiting check rings used for holes are formed in the inner walls of the corresponding positions of the middle cylinder barrels, limiting check rings used for shafts are installed on the outer walls of the corresponding positions of the middle cylinder barrels, and the two end faces of the inner ring of each limiting check ring used for holes and the two end faces of the outer ring of each limiting check ring used for shafts are chamfered. The oil cylinder is low in machining cost and compact in structure, the extending strokes and the maximum strokes of cylinder barrels at all levels can be adjusted finely by adjusting the positions of the limiting check rings used for holes and the limiting check rings used for shafts.

Description

technical field [0001] The invention relates to a multi-stage oil cylinder, in particular to a double-acting through-hole four-stage oil cylinder. Background technique [0002] Multi-stage oil cylinders are suitable for occasions with large strokes and small installation spaces, so that they can achieve longer strokes than single-stage oil cylinders in a given installation space. According to the action mode of the hydraulic oil in the oil cylinder, there are two types: single-acting oil cylinder and double-acting oil cylinder. In applications where there is neither self-weight nor external mechanical force, the piston cannot retract by itself, so a double-acting cylinder must be used. [0003] The multi-stage cylinder of the existing double-acting multi-stage oil cylinder generally adopts a stepped structure, and the material of the cylinder is mostly hot-rolled pipe. If the ratio is less than 10%, the machining allowance of the cylinder barrel is large, the material util...

AI Technical Summary

Problems solved by technology

[0003] The multi-stage cylinder of the existing double-acting multi-stage oil cylinder generally adopts a stepped structure, and the material of the cylinder is mostly hot-rolled pipe. The proportion is less than 10%, the machining allowance of the cylinder is large, the material utilization rate is low, and the processing efficiency is low

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