Hydraulic support column double-liquid-injection system

Abstract

The invention discloses a hydraulic support column double-liquid-injection system which comprises a column return passage (9), a column return three-use valve (10), a column return three-use valve seat (11), and a remote liquid-injection system. A column lifting passage (6) is formed in an inner passage of an oil cylinder (7). The upper portion of the column return three-use valve seat (11) is in slide seal with a second middle cylinder (3). The lower portion of the column return three-use valve seat (11) is connected with the oil cylinder (7). The column return three-use valve (10) us assembled in the column return three-use valve seat (11). The column return passage (9) is disposed in a passage between the outer wall of the second middle cylinder (3) and the inner wall of the oil cylinder (7) and communicated with the end face of a piston (8) of the second middle cylinder. The remote liquid-injection system comprises a three-way valve (12), a high-pressure rubber pipe (13), a liquid-injection nozzle (14) and an unloading device (15). By the column return passage, the middle cylinder of a two-stage support column or a multi-stage support column can reset completely, the problems of carrying difficulty and easy middle cylinder scratch which are caused by incomplete column return are solved effectively, and the service lives of the hydraulic support columns are guaranteed.

Description

technical field [0001] The invention relates to a mine support equipment, in particular to a double liquid injection system of a hydraulic prop. Background technique [0002] The single hydraulic prop is one of the main supporting equipment in the mining industry, mainly used in underground roadway support and coal mining face support. At present, the single hydraulic prop is mainly composed of a live column, a middle cylinder, a return spring, a three-purpose valve, and an oil cylinder. During work, the three-purpose valve is used to inject liquid into the oil cylinder, and the oil cylinder lifts the middle cylinder, and the middle cylinder drives the movable column. To work, when unloading, first return to the live column and then return to the middle cylinder; when resetting, it mainly relies on the return spring to reset, and the reset sequence of the pillar is: first the live column is reset, and then the middle cylinder is reset. However, for two-stage or multi-stage ...

AI Technical Summary

Problems solved by technology

However, for two-stage or multi-stage props, when resetting, the return spring generally cannot fully reset the middle cylinder, and there will be 100mm-150mm protruding out of the hydraulic prop, and the protruding middle cylinder is easily deformed by force during transportation. The surface of the cylinder is also easy to be scratched, which affects the working life of the hydraulic prop

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