Mining hydraulic support for replacing hydraulic media under pressure

Abstract

The invention relates to a mining hydraulic support for replacing hydraulic media under pressure. The hydraulic support comprises a balanced oil cylinder (5), a safety valve (4), a three-position four-way reversing valve (6), a stand column oil cylinder (7), a connecting pipeline, a liquid inlet pipeline and a liquid return pipeline. The hydraulic support is further provided with a first auxiliary pipeline (L1), a second auxiliary pipeline (L2), a third auxiliary pipeline (L3) and a fourth auxiliary pipeline (L4). The auxiliary pipelines are communicated with the oil cylinder (7) through an opening in the cylinder wall of the oil cylinder, and then are communicated with the liquid return pipeline or the liquid inlet pipeline to form a complete hydraulic loop after being sequentially connected with a one-way valve (2), a sequence valve (3) and a two-position four-way reversing valve (1). According to the scheme, liquid inside the oil cylinders can be replaced under the condition that the oil cylinders are not telescoped; meanwhile, the supporting force and drawing force of the oil cylinders are unchanged when the liquid is replaced; besides, oil cylinder corrosion is reduced by replacing 'dead water' in the oil cylinders.

Description

technical field [0001] The invention relates to the field of hydraulic technology, in particular to a mine-used pressurized hydraulic medium replacement hydraulic support. Background technique [0002] Hydraulic support is one of the essential equipment for underground mining. Its main material is iron, steel and other alloys made by forging. Due to the harsh environment of coal mines, the relative humidity of coal mining face and roadway is high, generally at 75 % or so, the equipment used is in a humid and corrosive environment for a long time. At the same time, if the oil cylinder does not move frequently, or even does not move for a long time, the liquid in the oil cylinder is in a closed state and cannot be renewed. It is easy to deteriorate and will accelerate corrosion Oil cylinders bring great safety hazards to underground production. [0003] CN203374290U discloses a kind of device that mine hydraulic support is carried out liquid discharge, and it touches two thre...

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Problems solved by technology

[0004] The above-mentioned patents or patent applications only disclose the problem of using gas to empty the liquid in the oil cylinder, and to improve the initial support force of the oil cylinder through the pressurized cylinder, or to replace the valve under pressure for oil and gas wellheads, although for hydraulic supports or oil cylinders And the valve has been modified, but it has not solved the problem that the emulsion in the oil cylinder does not flow for a long time and deteriorates to corrode the bracket and the oil cylinder

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