A hydraulic cylinder high pressure protection device

Abstract

The invention relates to a high-pressure protection device for a hydraulic cylinder, which relates to the technical field of hydraulic control, and solves the problems in the prior art that the pipelines of the oil spill protection device are redundant and the position accuracy of the hydraulic cylinder is difficult to guarantee after oil spillage. The hydraulic cylinder high pressure protection device of the present invention includes a valve body and a first piston, a second piston and a spring installed in the inner cavity of the valve body; the spring is located between the first piston and the second piston; The ends are respectively connected with the rodless cavity and the rod cavity of the hydraulic cylinder; when the pressure in the rodless cavity and the rod cavity overcomes the initial elastic force of the spring, the hydraulic oil pushes the first piston and the second piston to compress the spring, and the hydraulic oil flows to inside the valve cavity. The hydraulic cylinder high-voltage protection device of the present invention has a simple structure, can be directly installed on the hydraulic cylinder control valve block, saves the overflow valve and the oil overflow pipeline, and simplifies the hydraulic system; The displacement does not exceed 1mm, which ensures the position accuracy of the hydraulic cylinder.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a high-voltage protection device for a hydraulic cylinder. Background technique [0002] The hydraulic cylinder is one of the main actuators of the hydraulic system and is widely used in machine tool industry, metallurgical industry, automobile industry, light textile industry, engineering machinery, agricultural machinery and other fields. In the field that requires precise control, such as the field of supporting the mechanism and adjusting the horizontal angle through the hydraulic cylinder, after the hydraulic cylinder moves to the specified position, it needs to be locked. [0003] At present, most hydraulic systems use hydraulic locks to ensure the locking of hydraulic cylinders, such as figure 1 As shown, when the hydraulic cylinder (200) moves to a designated position, the hydraulic pump stops supplying oil, the hydraulic lock (300) is closed, and a closed cavi...

AI Technical Summary

Problems solved by technology

[0006] (1) It is necessary to arrange a separate oil spill pipeline for the relief valve, which makes the pipeline of the hydraulic system more complicated; (2) The oil spill of the relief valve is not controlled, which makes the oil spill at both ends of the hydraulic cylinder unstable and makes the hydraulic pressure The one-sided displacement of the piston in the cylinder exceeds 10mm, which makes it difficult to guarantee the position accuracy of the hydraulic cylinder after the temperature rises and the oil overflows

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