Cylinder, series cylinder and engineering vehicle

Abstract

The invention provides an oil cylinder, a series oil cylinder and an engineering vehicle. The oil cylinder comprises a cylinder body, a piston and a piston rod, a first oil way, a communicating deviceand an elastic connecting piece, wherein the two ends of the cylinder body are separately provided with oil inlets and end covers; the piston is arranged in the cylinder body and separates the cylinder body to form a rod cavity and a rod free cavity; the rod cavity and the rodless cavity separately communicate with the oil inlets; the piston rod is inserted in the end cover at one end of the rodcavity; the inner end of the piston rod is connected with the piston; the first oil way is arranged in the piston rod; one end of the first oil way communicates to the rodless cavity, and the other end of the first oil way communicates to the outer end of the piston rod through the first connecting oil way arranged in the piston rod; the communicating device can be axially and movably arranged onthe outer end of the piston rod along the piston rod; the communicating device has a communicating position to make the first oil way in a communicating state and a blocking position to make the firstoil way in a blocking state on the piston rod; and the elastic connecting piece is arranged between the communicating device and the piston or the piston rod. According to the oil cylinder, the series oil cylinder and the engineering vehicle, the purpose of extending a plurality of oil cylinders connected in series in sequence can be achieved.

Description

technical field [0001] The invention relates to the technical field of oil cylinders, in particular to an oil cylinder, a series oil cylinder and an engineering vehicle. Background technique [0002] At present, after the hydraulic cylinders are connected in series, in order to realize the sequential extension of the cylinders, an external hydraulic valve is mainly used for control. ', the hydraulic oil flows to the second oil cylinder through the oil circuit, the second oil cylinder extends, and so on), or increase the sequence valve 3' (by adjusting the pressure of the sequence valve 3', the sequence valve 3' is opened sequentially, thereby realizing The oil cylinder 1' extends out in sequence), etc., and its installation structure is as follows figure 1 (External installation of globe valve 2’) and if figure 2 (External installation sequence valve 3') as shown. [0003] But, the mode that above-mentioned oil cylinder 1 ' stretches out in order has following shortcomin...

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Problems solved by technology

[0004] 1. External shut-off valve 2', the opening of the shut-off valve 2' needs to be done manually, which is inconvenient to operate. At the same time, it is necessary to increase the control oil circuit, resulting in complex structure and cumbersome system operation;

[0005] 2. The external sequence valve 3', the pressure setting of the sequence valve 3' needs to be tested repeatedly, and it is difficult to finalize the design, and the load changes will cause the system pressure to change accordingly, which will easily cause confusion in the extension sequence of the oil cylinder 1', and will increase Complexity of System Control

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