Double-injection double-seal pressure-display memory type single hydraulic prop

Abstract

The invention discloses a double-injection double-seal pressure-display memory type single hydraulic prop, which belongs to the technical field of hydraulic props. A multi-purpose valve seat (27) for assembling a multi-purpose valve (29) is additionally arranged on a middle upper part of a middle cylinder (32), and a plunger liquid passing hole (35) is arranged on a plunger body above a plunger piston (38); two sealing rings are respectively arranged on each sliding sealing part of the prop; and a pressure-display meter (29-1) with a memory function is arranged on the multi-purpose valve (29) or on a handle body (9) and the multi-purpose valve seat (27). Even if the outer surface of the middle cylinder or the plunger is damaged to cause failure in seal, the prop can be used normally; liquid leakage is avoided under the condition that an axial continuous damaged length of a seal surface does not exceed a double-seal clearance range; and the pressure change and the liquid leakage of the prop can be observed and known timely, so that problems can be found and solved conveniently in time, and the safety of prop supporting is improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic props, in particular to a single hydraulic prop used for supporting underground mining working faces. Background technique [0002] Single hydraulic props for roof support of underground mining working face mainly include three types: single telescopic type, suspension type and double telescopic type. The single telescopic pillar, because of the small stroke of the pillar and the limited support range, will increase the reserve of pillars of different specifications and the number of replacements, increase the labor intensity of workers, and affect production efficiency. Therefore, the pillars currently used in mines are mainly Suspended and double telescoping struts. After the analysis of the existing technology and the investigation of the field use, it is found that there are still some individual and common problems in the existing single hydraulic prop, such as: [0003] 1. The existing ...

AI Technical Summary

Problems solved by technology

[0003] 1. The existing suspension type and double telescopic single hydraulic props are sealed with the outer surface of the live column and the middle cylinder, the sealing surface is easily damaged, and the sealing failure rate is high, which increases the capital investment for maintenance and replacement

[0004] 2. The dynamic seals of various single hydraulic props, including the single telescopic type, all adopt single-channel seals, and the sealing surface is narrow, which is easy to cause liquid leakage and affect the safety support performance of the props

[0005] 3. The existing various single hydraulic props have no pressure display, and the change of the pressure on the props cannot be observed and monitored. This is also the biggest safety hazard when using single hydraulic props for support.

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