Novel sealing device for large-mining-height hydraulic support stand column cylinder opening

Abstract

The invention discloses a novel sealing device for a large-mining-height hydraulic support stand column cylinder opening. The novel sealing device comprises an outer cylinder body, a middle cylinder body and a piston rod. The middle cylinder body is assembled in the outer cylinder body in a sliding manner, and the piston rod is assembled in the middle cylinder body in a sliding manner. A first upper sealing assembly is arranged at the upper portion of the inner wall of the outer cylinder body, a second upper sealing assembly is arranged at the upper portion of the inner wall of the middle cylinder body, and the first upper sealing assembly and the second upper sealing assembly are of the same structure. The first upper sealing assembly comprises a guide sleeve and a blocking sleeve, wherein the guide sleeve is located below the blocking sleeve. A wide-ring-shaped groove is formed in the outer wall of the guide sleeve, an electromagnet is assembled in the wide-ring-shaped groove, and the electromagnet is connected with an external power source. A sealing groove is formed in the inner wall of the guide sleeve, and a Y-shaped sealing ring, a second O-shaped sealing ring and a third blocking ring are embedded in the sealing groove. The Y-shaped sealing ring is made of polyurethane base magnetic current elastomers, and the second O-shaped sealing ring is made of nitrile rubber basemagnetic current elastomers. By means of the novel sealing device, the elastic modulus and rigidity of the two kinds of sealing rings can be changed, the system sealing performance is improved, and the effective support performance of a work face is improved.

Description

technical field [0001] The invention relates to the technical field of mechanical seals, in particular to a new type of sealing device for a cylinder port of a hydraulic support column with a large mining height. Background technique [0002] With the development of high-efficiency automatic coal mining technology and mine production automation in recent years, the technology of large mining height hydraulic support is constantly developing and updating. However, due to the complex working conditions of coal mining face, the seal of large mining height hydraulic support still faces friction, wear, There are many unfavorable factors such as corrosion, and there is a problem of working medium leakage. At present, the working medium used by most of the large mining height hydraulic supports is emulsion. Once leakage occurs, it will not only cause waste of resources, but also cause environmental pollution, and will cause the hydraulic support to be unable to provide effective su...

AI Technical Summary

Problems solved by technology

Furthermore, in the actual work of hydraulic supports with large mining heights, the pressure from the roof is mostly sudden, instantaneous, and high in pressure, which causes the sealing system of the support cylinder to suffer from alternating high-pressure impact loads for a long time, which will undoubtedly make the sealing The alternating contact stress of the sealing ring will cause the fatigue wear and damage of the sealing ring, resulting in the failure of the sealing ring

Images