Multi-oil-cylinder sequential telescopic system and crane

Abstract

The invention discloses a multi-cylinder sequential telescopic system. The multi-cylinder sequential telescopic system is provided with a first stroke valve and a second stroke valve, and uses the first stroke valve and the second stroke valve to control the first and second cylinders Sequential scaling. The multi-cylinder sequential expansion and contraction system can not only realize the sequential expansion and contraction of multiple oil cylinders, but also does not increase the pressure of the hydraulic system. In the case of a large number of oil cylinders, it is less difficult to implement and the cost is lower. On this basis, the present invention also proposes a crane with the multi-cylinder sequential telescoping system.

Description

technical field [0001] The invention relates to the control technology of multi-stage oil cylinders, in particular to a multi-oil cylinder sequential telescoping system and a crane. Background technique [0002] At present, the boom telescoping mechanism driven by the oil cylinder is a commonly used mechanism for hydraulic cranes. The boom driven by multiple oil cylinders has the advantages of strong lifting capacity and simple telescopic rope row mechanism. The booms with five-section boom and above adopt the form of multi-stage telescopic oil cylinder. For small cranes, due to the small size of the telescopic cylinder, complex pipelines and controls cannot be realized inside. Therefore, the currently commonly used sequence expansion and contraction control in China is generally realized by two sequence valves, but due to its shortcomings such as large pressure loss and unstable sequence function, its application has been limited. For this reason, it was proposed figure...

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Problems solved by technology

[0003] Due to the decompression effect of the sequence valve, when the subsequent oil cylinder operates, the pressure of the hydraulic system must be increased by P on the basis of the previous one; the increase of the system pressure will lead to a sharp increase in heat generation, which reduces the efficiency of the hydraulic system; and, if using This structure realizes sequential expansion and contraction of N oil cylinders. The pressure provided by the hydraulic system must overcome the normal load of N oil cylinders and also need to overcome the resistance of N-1 sequence valves, which is difficult to realize.

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