A multi-stage compound telescopic hydraulic cylinder for heavy load

Abstract

The invention relates to a multi-stage composite telescopic hydraulic cylinder for heavy loads, and relates to the technical field of fluid transmission. Through the matching design between multi-stage cylinders, the telescopic speed of the heavy-load multi-stage hydraulic cylinders can be obviously improved, the grade-changing impact frequency is reduced, and the problems that an existing composite telescopic hydraulic cylinder is difficult to process and manufacture, cannot be assembled and cannot be filled with oil in advance are solved; and in addition, the synchronous error generated in the reciprocating motion of the hydraulic cylinder can be eliminated, machining and manufacturing are simple, and installation and maintenance are easy.

Description

technical field [0001] The invention relates to the technical field of fluid transmission, in particular to a multi-stage composite telescopic hydraulic cylinder for heavy loads. Background technique [0002] The hydraulic cylinder is an important reciprocating motion actuator in the hydraulic system. Compared with single-stage hydraulic cylinders, multi-stage telescopic hydraulic cylinders have the advantages of shorter initial installation distance and longer stroke, and are widely used in large heavy-duty lifting equipment such as dump trucks and cranes. At present, large-scale heavy-duty lifting equipment mostly adopts traditional plunger or piston-type multi-stage hydraulic cylinders. The plungers or pistons at each level need to be extended step by step, and the extension speed is relatively slow. In addition, the plungers or piston rods at all levels need to be changed. When changing the level, the effective working area of ​​the hydraulic cylinder changes sharply, r...

AI Technical Summary

Problems solved by technology

At present, large-scale heavy-duty lifting equipment mostly adopts traditional plunger or piston-type multi-stage hydraulic cylinders. The plungers or pistons at each level need to be extended step by step, and the extension speed is relatively slow.

In addition, the plungers or piston rods at all levels need to be changed. When changing the level, the effective working area of ​​the hydraulic cylinder changes sharply, resulting in a sudden change in the system pressure and cylinder movement speed, which in turn causes collisions and vibration shocks, which not only affects the reliability of mechanical equipment, but also Affect lifting work efficiency

In response to the needs of hydraulic elevators and high-altitude operating vehicles, synchronous telescopic multi-stage hydraulic cylinders have appeared in recent years. Although this type of hydraulic cylinder has the advantages of fast movement speed and no impact of changing stages, under heavy loads, the hydraulic cylinder The pressure in the cavity is relatively high, and the external dimensions of the cylinder are relatively large, so it is not suitable for heavy-duty lifting occasions where the installation space is limited

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