Anti-shock device for hydraulic support

Abstract

The invention belongs to coal mine safety equipment, and particularly relates to a hydraulic support anti-shock device. An energy-absorbing anti-shock protection pad is arranged between the column socket of the hydraulic support and the column bottom of the column, and the column cap of the hydraulic support and the column head of the column. There is an energy-absorbing filling fluid in the cavity of the nest and the column cap. When the hydraulic support is impacted by the top and bottom plates during the support process, the energy-absorbing anti-shock protection pad consumes energy through the phase change at the moment when the column safety valve is too late to open. Dissipate the impact energy and reduce the impact force; when the hydraulic support is greatly impacted by the top and bottom plates, the column safety valve cannot resist the impact load on the hydraulic support, and the column socket and column cap will have a certain elastic deformation, and the energy absorption will be filled. After the liquid feels the impact, the viscosity will increase rapidly to dissipate the impact energy; the anti-shock device of the hydraulic support dissipates the impact energy received by the hydraulic support through the phase change effect of the anti-shock protection pad and the energy-absorbing filling fluid to protect the hydraulic support The structure is not damaged by impact.

Description

technical field [0001] The invention relates to an anti-shock device for a hydraulic support, which is used for the protection of the hydraulic support of the coal mine working face. Background technique [0002] The hydraulic support is used to support the fully mechanized mining face in coal mines. During the support process, it is often affected by the impact load of the roof and floor. At present, it is mainly protected by opening and discharging the column safety valve. The protection of the safety valve mainly has the following problems: First, the response time is not timely: the safety valve uses the compression of the spring to open the drain hole. Due to the compression of the spring, there is a certain response time. , the change time of the pressure rise in the lower chamber of the column is less than the response time of the spring, the safety valve is too late to open, and the impact energy cannot be released, resulting in damage to structural parts such as the...

AI Technical Summary

Problems solved by technology

The protection of the safety valve mainly has the following problems: First, the response time is not timely: the safety valve uses the compression of the spring to open the drain hole. Due to the compression of the spring, there is a certain response time. , the change time of the pressure rise in the lower chamber of the column is less than the response time of the spring, the safety valve is too late to open, and the impact energy cannot be released, resulting in damage to structural parts such as the column expansion cylinder, column socket, and column cap; the second is that the safety valve has a large area After opening, the production cycle to return to normal work is longer: the safety valve releases the emulsion for pressure relief protection. During the opening process, as a large amount of emulsion is discharged, the height of the hydraulic support also decreases. When the hydraulic support on the working face is greatly affected When the area impacts, the height of the hydraulic support will drop significantly, and the roof will sink accordingly. When the height of the hydraulic support is lower than the normal mining height, it must go through several production cycles before returning to the normal mining height; Protection against flushing, when the emulsion in the lower chamber of the column is drained, the safety valve can no longer be opened to release pressure and consume energy, and the hydraulic support will not be protected, resulting in structural damage

There are problems, the existing hydraulic support anti-shock device cannot realize the whole process of anti-shock protection, and cannot provide anti-shock protection before and after the hydraulic support safety valve is opened

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