Single-acting welded type four-stage oil cylinder

Abstract

The invention discloses a single-acting welded type four-stage oil cylinder which comprises an outer cylinder barrel, a primary cylinder barrel, a secondary cylinder barrel, a third-stage cylinder barrel and a piston rod assembly sequentially arranged in a sleeving manner from external to internal, wherein each of the primary cylinder barrel, the secondary cylinder barrel and the third-stage cylinder barrel is formed by welding a steel pipe, a piston and an internal limiting ring; the internal part of the end face of each steel pipe supports the corresponding internal limiting ring; the external part of the end face of each steel pipe is sleeved with the corresponding piston; the piston, the internal limiting ring and the end face of the steel pipe are assembled and welded to form a welding groove; an oil groove is formed in each piston in the axial direction, and a support circular groove is machined in the piston transversely. The single-acting welded type four-stage oil cylinder is more compact, adopts the welded type structure, is an integrity formed by welding the internal limiting rings, the pistons and the steel pipes, is small in chipping allowance, low in cost, simple in processing technology and high in efficiency; the pistons are machined after welding, so that the size of the support circular groove and the coaxiality of the support circular groove and the steel pipes are ensured, and the operational stationarity of the oil cylinder is ensured; the oil grooves are additionally formed in the pistons, so that the oil mass is increased, and the overall working efficiency of the oil cylinder is improved.

Description

technical field [0001] The invention relates to the field of multi-stage oil cylinders, in particular to a single-action welded four-stage oil cylinder. Background technique [0002] Multi-stage hydraulic cylinders are suitable for occasions with large strokes and small installation distances, so that they can achieve longer strokes than single-stage hydraulic cylinders in a given installation space. According to the action mode of the hydraulic oil, it is divided into single-acting and double-acting. When the single-acting cylinder is extended, it is lifted by the pressure oil, and when it is retracted, it is pressed back by the self-weight or spring force of the mechanism, such as a dump truck. The traditional multi-stage oil cylinder has an overall stepped structure, and the cylinder adopts a stepped and inner circlip limit structure. The cylinder limit structure is integrated with the cylinder, and the length of the inner hole step part accounts for less than 10% of the ...

AI Technical Summary

Problems solved by technology

The traditional multi-stage oil cylinder has an overall stepped structure, and the cylinder adopts a stepped and inner circlip limit structure. The cylinder limit structure is integrated with the cylinder, and the length of the inner hole step part accounts for less than 10% of the total length of the cylinder. %, the machining allowance of the cylinder is large, the material utilization rate is low, and the processing efficiency is low. In addition, the cylinder material is mostly hot-rolled tube, and the strength is low

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