Unit type constant-resistance elastic yielding anti-impact hydraulic support and working method thereof

Abstract

The invention discloses a unit type constant-resistance elastic yielding anti-impact hydraulic support which is composed of a support top beam, a support base, two hydraulic stand columns and a safetyvalve and is characterized by further comprising an energy storage device installed on the support base. When the static pressure of a top plate and a bottom plate of a roadway is greater than 40 Mpa, the safety valve is automatically opened to discharge part of emulsion for unloading; when an impact dynamic pressure of the top plate of the roadway is greater than 41.5 Mpa, impact energy is stored in a pressure spring, and the support is prevented from being broken and toppled; and when the top plate rebounds after the impact energy is released, the energy of the pressure spring is released along with the rebounding of the top plate, the emulsion is promoted to return to a liquid cavity of the hydraulic stand columns, and hydraulic jacks return to an original retraction state.

Description

technical field [0001] The invention relates to coal mine roadway support technology, in particular to a roadway advance support bracket. Background technique [0002] At present, in the advanced support of coal mine roadway, the unit type advanced hydraulic support is usually used. The structure of the support is composed of the support top beam, support base, double hydraulic columns and safety valve (pressure relief valve); between the two hydraulic columns Equipped with a fixing device, the emulsion chamber of the double hydraulic column is connected to the safety valve through a high-pressure pipe. When the static pressure of the roadway roof and floor is greater than 40Mpa, the safety valve can release part of the emulsion to unload, so that the hydraulic support always bears the constant resistance pressure less than 40Mpa to prevent the hydraulic support from being crushed. However, when the impact pressure suddenly occurs on the roof and floor of the roadway, due t...

AI Technical Summary

Problems solved by technology

However, the roof will rebound after impacting the ground, but the hydraulic column cannot rebound after shrinking, and cannot restore the initial support force in time, resulting in the impact area being in an unsupported state under the empty roof, which is likely to cause a roof fall accident and cause secondary damage. Injury; and the shrinkage cannot be used again, it is a one-time use and can only be replaced

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