Stand column with energy absorption, scour prevention and receding functions

Abstract

The invention discloses a stand column with energy absorption, scour prevention and receding functions. The problems that a hydraulic stand column cannot resist strong impact load, the phenomena of bending, fracture, cylinder explosion and the like of the hydraulic stand column are often caused when rock burst occurs, and normal support of a roadway is influenced in the prior art are solved. The stand column with the energy absorption, scour prevention and receding functions comprises a stand column cylinder body provided with a liquid inlet and a pressure relief safety valve at the lower end, and is characterized in that a liquid return opening is formed in the upper end of the stand column cylinder body, and a telescopic plunger is inserted into an opening in the upper end of the stand column cylinder body; an energy-absorbing and scour-preventing receding piston is arranged at the lower end of the inner part of the stand column cylinder body on the telescopic plunger; a plunger rod sealing piece is arranged between the inner wall of the opening in the upper end of the stand column cylinder body and the outer wall of the telescopic plunger. The stand column with energy absorption, scour prevention and receding functions is reasonable in design, compact in structure and capable of rapidly absorbing impact energy, effectively protecting the hydraulic stand column structure from being affected by impact damage, guaranteeing the personal safety of underground operating personnel and shortening the production recovery time after the rock burst occurs.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety support, and in particular relates to a device that can quickly absorb impact energy, effectively protect hydraulic column structures from impact damage, ensure the personal safety of underground workers, and shorten the recovery of production after rock burst occurs. A column with the function of energy absorption and anti-shock abdication of time. Background technique [0002] Rockburst (also known as mine earthquake or rockburst) is one of the major disasters in coal mines. As the mining depth of mineral resources increases day by day, the occurrence frequency and damage degree of rock burst become more and more intense. The huge elastic energy released at the moment of rock burst will cause the roof of the roadway to sink instantly and the floor to rise instantly, which will lead to the overall instability of the roadway support structure, the overturning and damage of mechanical equ...

AI Technical Summary

Problems solved by technology

Although the hydraulic column used in the hydraulic support has a certain ability to withstand static loads, and when the load exceeds the working resistance of the column, the purpose of buffering and abdicating the support can be achieved through the release of the pressure relief safety valve of the column; However, even if the safety valve with the maximum flow rate is selected, the process of draining liquid will take a few seconds or even longer at the fastest.

However, when rock burst occurs, the time from impact loading to the maximum load is only between a few milliseconds and tens of milliseconds. Because the dynamic response time is not enough, the pressure relief safety valve has no time to open, resulting in bending, breaking and breaking of the hydraulic column. Cylinder explosion and other phenomena affect the normal support of the roadway

Since the design of the existing hydraulic column does not take into account the anti-shock point of view, when the coal mine suddenly bursts, the hydraulic column cannot resist the strong impact load, so it is necessary to modify the structure of the hydraulic column in the prior art. Improve

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