Novel anti-impact stand column

Abstract

The invention discloses a novel anti-impact stand column. The novel anti-impact stand column solves the problems that an existing hydraulic stand column is poor in anti-impact load capacity, complex in buffer structure, high in manufacturing cost, large in workload of post-maintenance of the stand column, high in maintenance cost and long in operation period of normal support recovery of a roadway. The novel anti-impact stand column comprises a stand column cylinder body and is characterized in that a telescopic plunger is inserted into an opening in the upper end of the stand column cylinder body, a liquid inlet is formed in the lower end of the stand column cylinder body, a liquid return opening is formed in the upper end of the stand column cylinder body, and a pressure relief safety valve is further arranged at the lower end of the stand column cylinder body; and an anti-impact energy-absorbing device is arranged on the lower side of the cylinder bottom of the cylinder body at the bottom of the stand column cylinder body. The novel anti-impact stand column is reasonable in design, compact in structure, capable of effectively absorbing impact energy and protecting the structure of the hydraulic stand column, and good in use safety; and the number of parts needing to be replaced is small, the parts are convenient to replace, the later maintenance workload is small, the support recovery speed is high, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety support, and in particular relates to a structure capable of effectively absorbing impact energy and protecting a hydraulic column, which has good safety in use, a small number of parts to be replaced, convenient replacement of parts, and small post-maintenance workload , a new type of anti-shock column with fast recovery support and low production cost. Background technique [0002] During the supporting process of the hydraulic support of the coal mine fully mechanized mining face, the hydraulic column used for support is often affected by the impact load of the roadway roof and floor and is affected by it. As the main load-bearing part of the hydraulic support, the hydraulic column has a certain ability to withstand static loads, and when the load exceeds the working resistance of the hydraulic column, it can achieve the cushioning of the support through the release of the pressure rel...

AI Technical Summary

Problems solved by technology

With the increasing mining depth of mineral resources, the occurrence frequency and damage degree of rock burst are becoming more and more intense, which often leads to the overall instability of the roadway support structure, the overturning and damage of mechanical equipment, and even casualties and other accidents, which seriously affect the coal mine. production safety

Since the moment when rock burst occurs, huge elastic energy will be released, and the time from occurrence to complete release of the shock load is usually only between a few milliseconds to tens of milliseconds. Affected by the mechanical state, sometimes it is too late to open, or the instantaneous pressure relief capacity after opening cannot meet the demand, resulting in bending, fracture and cylinder explosion of the hydraulic column under pressure, which affects the normal support of the roadway

[0003] At the same time, in the design of the existing conventional hydraulic columns, no consideration has been taken from the perspective of anti-shock. When the coal mine suddenly bursts into ground pressure, the hydraulic column cannot resist the strong impact load.

In addition, some hydraulic column structures with a buffer mechanism at the bottom of the telescopic live column have a certain buffering effect, but the buffer structure is complicated, the manufacturing cost is high, and the workload of the later maintenance of the hydraulic column is large, and the number of parts that need to be replaced is large. , the maintenance cost is high, and the operation period for roadway restoration to normal support is long

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