Difunctional synchronous telescopic type multistage hydraulic cylinder and hydraulic device

Abstract

The invention relates to a difunctional synchronous telescopic type multistage hydraulic cylinder. The difunctional synchronous telescopic type multistage hydraulic cylinder comprises an outer cylinder barrel (10), at least one stage of middle cylinder barrel (14) and a piston rod (15), wherein a rod cavity of the outer cylinder barrel is communicated with a rodless cavity of the first-stage middle cylinder barrel to form a communication cavity, and a rod cavity of each stage of middle cylinder barrel is respectively communicated with a rodless cavity of each adjacent next-stage middle cylinder barrel to respectively form a corresponding communication cavity; and each communication cavity respectively keeps sealing when being full of hydraulic oil. In addition, the invention further provides a hydraulic device comprising the difunctional synchronous telescopic type multistage hydraulic cylinder. According to the difunctional synchronous telescopic type multistage hydraulic cylinder and the hydraulic device, disclosed by the invention, synchronous extension or shrinkage of a multistage hydraulic cylinder is realized, the multistage hydraulic cylinder runs stably and operates precisely, and can remarkably improve operation efficiency of the hydraulic device through synchronous extension and shrinkage, thus exact control of the multistage hydraulic cylinder is possible; in addition, the multistage hydraulic cylinder and the hydraulic device, disclosed by the invention, have excellent technical practicability and remarkably important technical application value.

Description

technical field [0001] The invention relates to a hydraulic cylinder, in particular to a double-acting synchronous telescopic multi-stage hydraulic cylinder. In addition, the present invention also relates to a hydraulic device with the double-acting synchronous telescopic multi-stage hydraulic cylinder. Background technique [0002] Multi-stage hydraulic cylinders are widely used in engineering, metallurgy, railway, hydropower, sanitation machinery and other fields. The so-called multi-stage hydraulic cylinder refers to a hydraulic cylinder that can achieve two or more levels of expansion and contraction. Those skilled in the art also call it a telescopic hydraulic cylinder, which generally includes an outer cylinder and at least one intermediate cylinder (also known as " "secondary cylinder" or "secondary piston") and piston rod (the piston rod is often formed in a hollow form to set the corresponding oil pipe or as an oil inlet and outlet channel, so those skilled in the...

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Problems solved by technology

In addition, it is a technical problem to realize the synchronous expansion and contraction of multi-stage double-acting hydraulic cylinders in the prior art. The so-called synchronous expansion and contraction of a very small number of "single-acting two-stage telescopic hydraulic cylinders" cannot be realized in terms of their hydraulic principles. Relatively stable and reliable synchronous expansion and contraction, even synchronous extension cannot be guaranteed

[0007] In summary, the disadvantages of the above-mentioned prior art double-acting multi-stage hydraulic cylinders are as follows: first, each stage hydraulic cylinder does not extend or retract at the same time, but extends or retracts step by step, which makes the double-acting multi-stage hydraulic cylinder The work efficiency is greatly reduced. In the occasions that require fast operation, the double-acting multi-stage hydraulic cylinder of the prior art often cannot meet the work needs; second, the speed that each stage hydraulic cylinder stretches out or retracts is different or out of proportion. To a certain extent, it also leads to difficulties in the precise control of the hydraulic cylinder.

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