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Single hydraulic props for coal mines are more and more widely used in production. Compared with traditional wooden pillars supporting metal friction, they have the advantages of high recovery rate, safe and reliable support, stable working resistance, high set load, and sensitive application. The outer single hydraulic prop can be used alone or in combination with metal hinged roof beams, and can be used in coal seams with an inclination angle of less than 25. The roof of the stope is steeply inclined, and it can also be used for end support or temporary support of the fully mechanized mining face.
At present, the external injection type C-shaped handle body parts are welded on both ends of the outer wall of the cylinder and fixed, so that the handle body and the cylinder body cannot roll relative to each other, resulting in limited operating space of the outer single hydraulic prop and inconvenient use. In addition, the DN external injection coal single hydraulic prop adopts emulsion, which is easy to corrode.