Vertical column pressure self-adaptive adjusting and controlling system

Abstract

The invention provides a vertical column pressure self-adaptive adjusting and controlling system. The vertical column pressure self-adaptive adjusting and controlling system comprises a pilot valve, ahydraulic control one-way valve, a sequence valve, a safety valve, a hydraulically-operated reversing valve, a vertical column, a liquid supply pipeline P and a liquid return pipeline O. During initial supporting of a vertical column, a lower cavity of the vertical column and an upper cavity of the vertical column communicate with the liquid supply pipeline P, and the supporting resistance is lowduring initial working of the vertical column; when the vertical column normally works, the upper cavity of the vertical column communicates with the liquid supply pipeline P, and the pressure of thelower cavity of the vertical column is increased along with increase of externally-applied loads due to the effect of the hydraulic control one-way valve; and when the pressure of the lower cavity ofthe vertical column reaches a set value, the sequence valve acts, the hydraulically-operated reversing valve carries out reversing, the upper cavity of the vertical column communicates with a liquidreturn port O, the supporting resistance of the vertical column is increased along with increase of the externally-applied loads, when the pressure of the lower cavity of the vertical column reaches the set pressure of the safety valve, the safety valve is switched on, the supporting resistance of the vertical column reaches rated working resistance, the purposes that the initial supporting forceof the vertical column is low, the working resistance is high, and the change amplitude of the supporting resistance is large are achieved, and meanwhile the purpose of automatically adjusting the supporting resistance according to the load change is achieved.

Description

technical field [0001] The invention relates to a column pressure self-adaptive control system, which is used for the advanced hydraulic support support of the coal mine working face roadway. Background technique [0002] Before elaborating on specific technologies, the meanings of the following three terms are explained first. [0003] Initial support force: support resistance when the column initially works. [0004] The first peak support resistance of the column: the support resistance achieved by the column when the hydraulic reversing valve is reversing. [0005] The second peak working resistance of the column: the support resistance achieved by the column when the safety valve in the lower cavity of the column is opened. [0006] Back pressure: The pressure of the liquid supply pipeline under the liquid return circuit breaker valve, generally around 2MPa. [0007] The advanced hydraulic support is used for the advanced support of the roadway in the underground wor...

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Problems solved by technology

[0008] 1. If the initial support force is too high, when the hydraulic support is moved, the column is repeatedly lowered and raised during the move process, and the roof is repeatedly loaded and unloaded, and the roof is easily damaged due to the large initial support force

[0009] 2. Decrease the cylinder diameter of the column and reduce the initial support force of the support. However, as the cylinder diameter of the column decreases, the working resistance also decreases. When the roadway is pressed, the working resistance of the leading support is not enough to meet the needs of the roadway support.

There is a problem. The pressure of the advanced support does not have the ability of self-adaptive adjustment. The pressure setting of the pressure reducing valve must be manually adjusted according to the data displayed by the advanced mine pressure during the mining process. It is difficult to match the resistance of the advanced support with the actual pressure distribution of the roadway in real time. Realize self-adaptive support of advanced support

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