Hydraulic supporting column with good sealing performance

Abstract

The invention discloses a hydraulic supporting column with good sealing performance. The hydraulic supporting column comprises a movable column, a cylinder body and a second piston head assembled on the lower portion of a first piston head, a base is arranged at the bottom of the cylinder body, and the cylinder body is provided with a handle body; the movable column is arranged in the cylinder body and is in sliding sealing fit with the inner wall of the cylinder body through the first piston head arranged at the lower end of the movable column, the second piston head is in sliding sealing fitwith the inner wall of the cylinder body, and the second piston head is fixedly connected with the first piston head through a connecting rod; and a valve seat is mounted on the periphery of the lower portion of the cylinder body in a sleeving mode, the valve seat is internally provided with a three-purpose valve, the three-purpose valve communicates with an inner cavity of the cylinder body through a liquid injecting hole radially formed in the cylinder body, and an annular limiting table for positioning the second piston head is arranged at the position, on the upper portion of the liquid injecting hole, of the inner cavity of the cylinder body. The single-body hydraulic supporting column is good in sealing performance and can still have good sealing performance after working for a longtime, and maintenance frequency can be reduced.

Description

technical field [0001] The invention relates to a hydraulic prop, in particular to a hydraulic prop with good sealing performance. Background technique [0002] Single hydraulic props are widely used as support equipment in underground tunnels and working faces of coal mines. In actual use, the sealing performance of hydraulic props will decrease with the increase of use time, which will cause the props to retract and require continuous fluid replenishment. occurs, which not only increases the maintenance cost, but also makes the safety of the support unguaranteed. SUMMARY OF THE INVENTION [0003] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a hydraulic prop with good sealing performance. The single hydraulic prop has good sealing performance, can still have good sealing performance after long-term operation, and can reduce maintenance times. [0004] In order to achieve the above purpose, the present invention provides...

AI Technical Summary

Problems solved by technology

[0002] Single hydraulic props are widely used in coal mine underground roadways and working faces as support equipment. In actual use, the sealing performance of hydraulic props will decrease with the increase of use time, which will cause the props to retract, so as to require continuous fluid replenishment. This not only increases the maintenance cost, but also makes the safety of the support unable to be guaranteed

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