Anti-impact energy absorber for hydraulic support

Abstract

The invention discloses an anti-impact energy absorber for a hydraulic support, and belongs to the technical field of roadway supporting equipment. The anti-impact energy absorber for the hydraulic support comprises an upper cylinder cover, a cylinder barrel and a lower cylinder cover which are sequentially connected from top to bottom, a spring, an upper piston, an energy absorption box and a lower piston are sequentially arranged in the cylinder barrel from top to bottom, a first through hole is formed in the middle of the upper piston, emulsion enters the upper portion of the upper piston through the first through hole, the lower cylinder cover is fixedly connected with a liquid discharging pipe, the upper portion of the liquid discharging pipe penetrates through the lower piston and extends into the energy absorption box, a second through hole is formed in the top of the liquid discharging pipe, and a third through hole is formed in the upper portion of the side face of the liquid discharging pipe. The anti-impact energy absorber for the hydraulic support is separated from the hydraulic support, the pressure of impact load on the hydraulic support can be reduced when rock burst occurs, the pressure of a hydraulic support column is within the bearable range of the support column, the supporting performance and the energy absorption and anti-impact capacity of the hydraulic support are improved, and the stability of a roadway is maintained.

Description

Technical field [0001] The present invention relates to the field of roadway support equipment, and more particularly to a fire absorber for hydraulic brackets. Background technique [0002] With the rapid development of coal resources, the advanced coal resources gradually decrease, and the depth of coal mines has gradually increased. Under the highland stress and complex geological environment conditions, the mourning of the roadway is gradually increasing, and the energy released is gradually increased, and the hydraulic bracket has become a conventional support for deep impact ground roadway. However, the strong shock wave generated by the deep exploitation of impact ground is transmitted from surrounding rock to the lane hydraulic bracket, which has a strong instantaneous pressure on the hydraulic bracket. The hydraulic pillar on the common hydraulic bracket used is limited due to safety valve discharge velocity and flow. It cannot be opened quickly, quickly drain it in a sh...

AI Technical Summary

Problems solved by technology

However, the strong shock wave generated by rock burst in deep mining is transmitted from the surrounding rock to the hydraulic support of the roadway, which produces strong instantaneous dynamic pressure on the hydraulic support. The hydraulic support on the common hydraulic support currently used is limited by the discharge speed and flow of the safety valve. , cannot be opened quickly in a very short period of time, and the liquid can be drained quickly, resulting in the pressure of the hydraulic prop exceeding the limit value in a short period of time, causing damage phenomena such as column bending, thickening, bursting and fracture, and finally causing roadway deformation and damage, or even collapse and damage. Serious casualties and property damage

[0003] At present, there are energy-absorbing anti-shock hydraulic supports. The energy-absorbing box placed on the top beam or hydraulic support of the hydraulic support absorbs the impact energy and prevents the hydraulic support from being damaged due to the impact of dynamic load. However, since the energy-absorbing box is directly placed on the hydraulic support or On the hydraulic prop, it is in a compressed state for a long time, and fatigue damage will occur under the action of multiple small impact loads, which will reduce the energy absorption performance of the energy-absorbing box

On the other hand, the rated working resistance of the hydraulic prop is lower than the minimum load when the energy-absorbing box deforms and absorbs energy. Therefore, when the impact load is small, the energy-absorbing box cannot play the role of deforming and absorbing energy, resulting in an instantaneous support pressure increase of the hydraulic prop. , although there is no obvious deformation and failure, fatigue failure will also occur under the action of multiple small energy impact loads, and because the surrounding rock is deformed under the action of impact loads, the support resistance of the hydraulic support is reduced, thus affecting Support performance and energy absorption performance of hydraulic support

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