Hydraulic cylinder suitable for controlling plurality of hydraulic cylinders to extend sequentially

Abstract

The invention discloses a hydraulic cylinder suitable for controlling a plurality of hydraulic cylinders to extend sequentially. The hydraulic cylinder comprises a hydraulic cylinder body, a piston body, a piston rod, piston seals, a check valve and an oil gathering block, wherein the piston body in a hollow cylinder structure is arranged in the hydraulic cylinder body; the piston rod is fixedly connected with the front end of the piston body; the piston seals are arranged in corresponding ring slots which are machined on the outer circle surface of the piston body sequentially from the front side to the rear side; the check valve is arranged on the piston body; and the oil gathering block is fixedly connected to the hydraulic cylinder body. The hydraulic cylinder has the characteristics that the plurality of hydraulic cylinders can sequentially and smoothly extend when connected in series and cannot be limited by the number of the hydraulic cylinders or influenced by the actual load fluctuations under the condition that external control elements (such as sequence valves used in the prior art) are not added.

Description

technical field [0001] The invention relates to a hydraulic cylinder suitable for controlling the sequential extension movement of multiple hydraulic cylinders. The hydraulic cylinder does not need additional control elements such as sequence valves, has low cost, low pressure drop loss, low energy consumption, and can effectively control Reliability of sequential extension movements. Background technique [0002] At present, the sequential action of multiple hydraulic cylinders is widely used in the extension work of the telescopic arm of the lifting equipment, but due to the limitation of the boom structure space of the crane arm, adding too many peripheral components is not conducive to the overall design and component installation, and The increased part weight of the control elements is also a load on the jib. [0003] Under the current technical conditions, in order to ensure the sequential extension movement of the boom telescopic hydraulic cylinder, the pressure con...

AI Technical Summary

Problems solved by technology

However, with the increase of the boom section (i.e., the actuator), the pressure setting of the sequence valve of multiple hydraulic cylinders and the system energy loss caused by the sequence valve will become a prominent problem

by image 3 Take the current technology (Rexroth) tubular sequence valve as an example. The minimum set opening pressure range of the low-pressure opening series of the valve is 10~30bar. If it is applied to the system with a maximum working pressure of 350bar, six hydraulic cylinders are required to extend sequentially and In a control system where the opening pressure difference setting value of two adjacent sequence valves is 20bar, theoretically speaking, only the use of the sequence valve will make the pressure of the system working pressure transmitted to the last sixth hydraulic cylinder only reach 250bar, the system pressure loss reaches 28.6%. Therefore, the current technology has certain limitations in both the reliability and application range of sequential motion control

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