Mining diameter-expanding type anti-impact single hydraulic bracket

Abstract

The invention belongs to safety supporting and protecting equipment for coal mines and particularly relates to a mining diameter-expanding type anti-impact single hydraulic bracket, which comprises a single hydraulic bracket (5) and a steel plate (1), wherein the upper main body of the single hydraulic bracket (5) is in the shape of a variable-diameter boss, a diameter-expanding pipe (2) which is provided with a diameter-expanding pipe-inserting slot (2-1), is engaged with the single hydraulic bracket (5) and is the same as the single hydraulic bracket (5) in shape is installed on the variable-diameter boss of the single hydraulic bracket (5), a diameter-expanding sleeve (3) which is closed at the upper end is inserted into the diameter-expanding pipe-inserting slot (2-1), the closed inner top end of the diameter-expanding sleeve (3) is connected with the top end of the diameter-expanding pipe (2), an anti-tilting sleeve (4) is installed by connecting the periphery of the diameter-expanding sleeve (3) and the single hydraulic bracket (5) through threads, and the steel plate (1) is fixedly arranged at the top end of the diameter-expanding sleeve (3). Through the mining diameter-expanding type anti-impact single hydraulic bracket, the problems that the dynamic response time of an overflow valve is insufficient and the overflow valve is too late to turn on when impact ground pressure occurs are solved, the situations of bending, breakage and cylinder explosion of the single hydraulic bracket are prevented or lightened when the impact ground pressure occurs, and diameter-expanding pipe parts are conveniently replaced.

Description

technical field [0001] The invention belongs to safety support equipment for coal mines, in particular to an expanding-diameter anti-shock single hydraulic support for mines. Background technique [0002] The occurrence of rock burst is instantaneous, sudden and destructive, accompanied by the release of a large amount of energy, and the released impact energy is as large as 10 3 MJ, the released impact energy mainly acts on two parts, one part acts on the coal rock mass, causing the coal rock mass to be broken; the other part acts on the roadway surrounding rock and support structure through transmission and consumption, and its huge impact energy acts on the coal rock mass and The roadway will cause the coal and rock mass to be broken and the roadway and its supporting structure to be damaged. The commonly used single hydraulic support has the support force related to the deformation of the rock mass, which suppresses the deformation of the roadway, but the large rheologi...

AI Technical Summary

Problems solved by technology

[0005] The beneficial effects of the present invention are: the diameter-expanding type anti-scourr single hydraulic support for mining is aimed at the characteristics of rapid release of energy in the form of impact when rock burst occurs in coal mines, and a diameter-expanded anti-scourr single hydraulic support is designed. The anti-shock single hydraulic support can reach the rated support capacity under the action of static load, and the expanding pipe can realize the reaction force to keep constant under the action of impact load. After being expanded, it is pressed into the upper body of the single hydraulic support, and the diameter The pipe absorbs part of the impact energy during the diameter expansion process, and the compressed space also provides energy release space for the coal rock. The diameter expansion pipe also indirectly absorbs part of the impact energy, and it also better solves the problem of the overflow valve when the rock burst occurs. The dynamic response time is not enough, the overflow valve is too late to open the problem, which eliminates or alleviates the bending, breaking and cylinder explosion of the single hydraulic support during rock impact, plays a better role in preventing impact rock pressure, and can also facilitate the replacement of expansion diameters pipe parts

Images