Two-stage unloading pilot-controlled check valve for hydraulic support pole

Abstract

The invention discloses a two-stage unload hydraulic one-way valve used in hydraulic bracket column, which comprises a valve chamber, a valve body with liquid inlet and outlet, a valve base inside said valve chamber; a big valve pin sealed matching said valve base, a recover spring, a valve sleeve connecting the end of valve rod, a metallic sealing surface between the big valve pin and said valve base; and a small valve pin sheathing the valve rod which is sealed matched with said valve base. The invention has the advantages that: it can meet the speed demand of high-pressure big-flow (480L / min) bracket, and the demand of two-stage unload. The invention combines the valve sleeve, valve base, big valve pin, small valve pin and the recover spring as a whole, with easy installment. The invention has passed the detection of national test center of coal academy of science, to reach the standard of MT419-1995.

Description

technical field [0001] The invention relates to a hydraulically controlled one-way valve, in particular to a secondary unloading hydraulically controlled one-way valve for hydraulic support columns. Background technique [0002] At present, the sealing form of the column control valve used on the hydraulic support in the coal mine generally adopts a soft sealing structure, that is, non-metallic materials such as polyoxymethylene or Meiyan No. 3, which have poor erosion resistance, pollution resistance, impact resistance, and short service life; especially The assembly of various parts in the valve is a non-integral assembly method, which makes the installation and downhole maintenance of the valve very inconvenient. At the same time, with the application of the electro-hydraulic control system in coal mines, the requirements for the moving speed of the support are getting higher and higher. The flow rate of the column control valve has a direct impact on the moving speed of ...

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Problems solved by technology

[0002] At present, the sealing form of the column control valve used on the hydraulic support in the coal mine generally adopts a soft sealing structure, that is, non-metallic materials such as polyoxymethylene or Meiyan No. 3, which have poor erosion resistance, pollution resistance, impact resistance, and short service life; especially The assembly of various parts in the valve is a non-integral assembly method, which makes the installation and downhole maintenance of the valve very inconvenient

At the same time, with the application of the electro-hydraulic control system in coal mines, the requirements for the moving speed of the support are getting higher and higher. The flow rate of the column control valve has a direct impact on the moving speed of the support, and the flow rate of the above-mentioned column control valve is the largest. It is 400L / min, which cannot meet the moving speed requirements of high-end product brackets (bore up to 380mm)

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