What is a single hydraulic prop? What is the structure and working principle of the single hydraulic prop? Want to know? Follow me to explore the structure and working principle of the single hydraulic prop! Single hydraulic prop is composed of 3 parts and some parts, its specific structure and working principle let's explore together!
I. structure of single hydraulic prop
Single hydraulic prop is composed of cylinder block, movable column, valve and other parts. The three-use valve is the heart of the external injection type single hydraulic prop, which is composed of one-way valve, unloading valve and relief valve king part. One-way valve for single hydraulic prop for liquid, unloading valve for single hydraulic prop for unloading back column, safety valve to ensure that the single hydraulic prop with constant resistance characteristics. This paper introduces the structure and working principle of external injection monomer hydraulic prop.
The working principle of single hydraulic prop
When lifting the column, operate the handle of the injection gun, and the high-pressure liquid enters the lower cavity of the pillar through the one-way valve in the three-use valve and the radial hole in the valve barrel, and the living column rises. When the pillar roof makes the metal roof beam close to the roof of the working face and the live column does not rise any more, loosen the handle of the injector gun, and the injector gun will cut off the island pressure flow. Then the pressure in the lower cavity of the pillar is the pressure of the pump station, so that the pillar can give the roof initial support and complete the columb-initial support stage.
With the extension of support time, the load exerted by the roof of the working face on the pillar increases. When the roof pressure exceeds the rated working resistance of the pillar, the high-pressure liquid in the pillar cavity will open the safety valve in the three-use valve, and the liquid will overflow from the gap between the right valve tube and the safety valve sleeve. The pressure in the pillar cavity decreases and the pillar shrinks. When the pressure in the pillar cavity is lower than the spring force of the safety valve, the safety valve closes, the pressure liquid in the pillar cavity stops overflowing, and the pillar stops shrinking.
When returning the column, insert the unloading handle into the unloading hole of the three-use valve barrel, turn the unloading handle (or pull the unloading installation), force the mounting valve to move axially, thus opening the unloading valve. The emulsion inside the pillar cavity is sprayed into the goaf area of the working face through the clearance between the unloading valve, the right valve tube and the liquid injection body.
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