Impact-resistance and energy-absorption lengthening bar for single prop

Abstract

The invention discloses an impact-resistance and energy-absorption lengthening bar for a single prop. The impact-resistance and energy-absorption lengthening bar for the single prop comprises a sill pillar and a guide pillar. The lower part of the sill pillar is provided with a lower backing plate; the lower backing plate is fixedly connected with the sill pillar; a spring set which is formed by covering compound rubber springs with a tower-shaped spring is arranged in the sill pillar and above the lower backing plate; an upper backing plate is arranged above the spring set; an energy-absorption block is arranged above the upper backing plate; a high-strength pushing cylinder is arranged above the energy-absorption block; the high-strength pushing cylinder is tightly pressed onto the energy-absorption block; a slider is arranged above the high-strength pushing cylinder; the outer edge of the slider is provided with grooves; the guide pillar is arranged in the grooves of the slider and is fixedly connected with the slider; at least one metal energy-absorption cylinder is sheathed outside the guide pillar. According to the impact-resistance and energy-absorption lengthening bar for the single prop disclosed by the invention, by utilizing the characteristic that a high-strength elastic-plastic foam material of the energy-absorption block is extruded to be broken to absorb energy and by utilizing the non-elastic stiffness of the spring set, a support is prevented from generating resonance when being impacted, and meanwhile, the at least one metal energy-absorption cylinder sheathed outside the guide pillar is fractured to absorb the energy.

Description

technical field [0001] The invention belongs to the technical field of coal mine support, and in particular relates to an anti-shock energy-absorbing extension rod for a single pillar. Background technique [0002] With the increase of my country's energy demand and the continuous increase of mining intensity, the excavation depth is getting deeper and deeper, and mines with a depth of several thousand meters are not uncommon. In the next few years, most mines will enter the stage of deep mining. The surrounding rock of mining roadways in deep mines will deform greatly under high pressure, requiring large deformation of support to give way; the frequency and intensity of rock bursts will increase, causing a large number of roadway support damage , Collapse and casualty accidents have seriously affected the safe production of coal mines, which requires the support to have the function of fast energy absorption and anti-shock. [0003] For the ordinary single pillars currentl...

AI Technical Summary

Problems solved by technology

In the next few years, most mines will enter the stage of deep mining. The surrounding rock of mining roadways in deep mines will deform greatly under high pressure, requiring large deformation of support to give way; the frequency and intensity of rock bursts will increase, causing a large number of roadway support damage , collapse and casualty accidents have seriously affected the safe production of coal mines, which requires the support to have the function of fast energy absorption and anti-shock

[0003] For the ordinary single pillars currently used in the roadway, under the condition of strong impact dynamic load generated by the impact rock pressure, the support capacity of the pillars is basically exceeded, resulting in short-term pillars due to excessive pressure, resulting in bending, thickening, bursting and fracture of the pillars and other damage phenomena, causing hundreds of meters of roadways to collapse, seriously threatening the safety of personnel and slowing down production progress

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