CN110410115B - Self-adaptive control system for pressure of stand column - Google Patents
Self-adaptive control system for pressure of stand column Download PDFInfo
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- CN110410115B CN110410115B CN201910661380.6A CN201910661380A CN110410115B CN 110410115 B CN110410115 B CN 110410115B CN 201910661380 A CN201910661380 A CN 201910661380A CN 110410115 B CN110410115 B CN 110410115B
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- 239000007788 liquid Substances 0.000 claims abstract description 35
- 230000009471 action Effects 0.000 claims abstract description 5
- 230000003044 adaptive effect Effects 0.000 claims description 3
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- 238000004891 communication Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
- E21D15/45—Hydraulic, pneumatic, or hydraulic-pneumatic props having closed fluid system, e.g. with built-in pumps or accumulators
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Abstract
A self-adaptive control system for the pressure of an upright column comprises a control valve, a hydraulic control one-way valve, a sequence valve, a safety valve, a hydraulic reversing valve, the upright column, a liquid supply pipeline P and a liquid return pipeline O; when the upright post is initially supported, the lower cavity and the upper cavity of the upright post are communicated with the liquid supply pipeline P, and the support resistance is lower when the upright post initially works; when the upright column works normally, the upper cavity of the upright column is communicated with the liquid supply pipeline P, and the pressure of the lower cavity of the upright column rises along with the increase of external load due to the action of the hydraulic control one-way valve; when the pressure of the lower cavity of the upright post reaches the set value, the sequence valve acts, the hydraulic reversing valve reverses, the upper cavity of the upright post is communicated with the liquid return port O, the supporting resistance of the upright post is increased along with the increase of external load, when the pressure of the lower cavity of the upright post reaches the set pressure of the safety valve, the safety valve is opened, the supporting resistance of the upright post reaches the rated working resistance, the initial supporting force of the upright post is lower, the working resistance is higher, the variation range of the supporting resistance is large, and meanwhile, the purpose of automatically adjusting the supporting resistance.
Description
Technical Field
The invention relates to a self-adaptive control system for the pressure of a stand column, which is used for supporting an advanced hydraulic support of a roadway of a coal mine working face.
Background
Before setting forth specific techniques, the meanings of the following three terms will be explained first.
Initial supporting force: and supporting resistance when the upright column initially works.
The first peak value of the column supports resistance: the supporting resistance of the upright post is achieved when the hydraulic reversing valve reverses.
Column second peak operating resistance: the supporting resistance of the stand column is achieved when the stand column lower cavity safety valve is opened.
Back pressure: the pressure of the liquid supply pipeline under the liquid return circuit-breaking valve is generally about 2 MPa.
The hydraulic advance support is used for the advance support of a roadway of an underground working face of a coal mine, and the prior hydraulic advance support has the following problems.
1. If the initial supporting force is too high, when the hydraulic support moves, the upright column repeatedly descends and ascends in the moving process, the top plate is repeatedly loaded and unloaded, and the top plate is easily damaged due to the large initial supporting force.
2. Reduce the stand jar footpath, reduce support initial force, but along with the stand jar footpath reduces, the working resistance also reduces thereupon, and forepoling working resistance is not enough when the tunnel comes to press, can't satisfy the tunnel and strut the needs.
How to realize that the hydraulic support of advance is less, working resistance is higher, and strut the resistance and can adjust according to load change is automatic, is the problem that present advance support urgent need solve.
The invention 201410651503.5 discloses a method for controlling unequal-strength support of an advance hydraulic support, which realizes unequal-strength support of the advance hydraulic support by arranging an adjustable pressure reducing valve. The problem exists that the pressure of the forepoling does not have the self-adaptive adjusting capability, the pressure setting of the pressure reducing valve needs to be manually adjusted according to the forepoling pressure display data in the extraction process, the real-time matching of the forepoling resistance and the actual pressure distribution of the roadway is difficult to achieve, and the self-adaptive support of the forepoling cannot be achieved.
Disclosure of Invention
The technical problem to be solved by the invention is how to overcome the defects in the prior art, realize that the initial supporting force of the advance hydraulic support is smaller, the working resistance is higher, and the supporting resistance can be automatically adjusted according to the load change, and provide the upright post pressure self-adaptive control system for the advance hydraulic support.
The technical scheme is as follows: the invention provides a column control system, which is provided with a sequence valve (3) and a hydraulic reversing valve (5), wherein when a column is initially supported, a lower column cavity (7) and an upper column cavity (8) are communicated with a liquid supply pipeline P, and the initial supporting force of the column is lower; when the upright column normally works, the upright column upper cavity (8) is communicated with the liquid supply pipeline P, the pressure of the upright column lower cavity (7) rises along with the increase of external load, when the pressure of the upright column lower cavity (7) reaches the set pressure, the sequence valve (3) acts, the hydraulic reversing valve (5) reverses, the upright column upper cavity (8) is communicated with the liquid return port O, the upright column supporting resistance is increased along with the increase of the upright column supporting resistance, when the pressure of the upright column lower cavity (7) reaches the opening pressure of the safety valve (4), the safety valve (4) is opened, the upright column supporting resistance reaches the rated working resistance, the lower upright column initial supporting resistance is realized, and the aim of automatically adjusting the supporting resistance according to.
The present invention has the following advantages.
The hydraulic control system has the advantages that the control system is simple, the pressure of the lower cavity of the stand column is sensed only through the sequence valve, and the reversing is performed through the hydraulic reversing valve, so that the purposes of small initial supporting force and large working resistance can be achieved.
The hydraulic control system is easy to realize, a bracket and a stand column structure do not need to be changed, only a sequence valve and a hydraulic reversing valve are arranged in the existing control system, and meanwhile, the liquid supply modes of the operating valve and the liquid inlet and return ports are changed, so that the hydraulic control system can be realized.
The self-adaptive control capacity is realized, the pressure of the stand column is automatically regulated and controlled according to load changes under the action of the sequence valve and the hydraulic reversing valve, manual operation is not needed, and the self-adaptive control capacity is realized.
Drawings
FIG. 1 is a control system schematic of the present invention.
In the figure, 1-an operating valve, 2-a hydraulic control one-way valve, 3-a sequence valve, 4-a safety valve, 5-a hydraulic reversing valve, 6-an upright post, 7-an upright post lower cavity and 8-an upright post upper cavity.
Fig. 2 is a graph of the change in column pressure of the present invention.
In the figure, 1-when the upper cavity of the upright post is connected with the pressure pipeline at the outlet of the pump station, the upright post supports a resistance curve; 2-when the upper cavity of the upright post is communicated with the liquid return port pipeline of the pump station, the upright post supports a resistance curve; p0-pump station pressureForce, P1Pressure in lower chamber of column at first peak pressure of column, P2Sequence valve actuation pressure, PmaxRelief valve opening pressure, F1-the upper and lower chambers of the column are in communication with the fluid supply port of the pump station, the column setting force, F1maxSupport resistance of the column during actuation of the sequence valve, F2Support resistance of the column when the upper chamber of the column is in communication with the return port of the pump station, F2maxWorking resistance of the column, Δ F, when the upper chamber of the column is in communication with the return port of the pump stationmax=F2max-F1max。
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
As shown in fig. 1, an adaptive control system for upright post pressure is mainly used for controlling the supporting resistance of an advance hydraulic support of a roadway on a working face, and comprises a reversing valve (1), a hydraulic control one-way valve (2), a sequence valve (3), a safety valve (4), a hydraulic control reversing valve (5), an upright post (6), an upright post lower cavity (7), an upright post upper cavity (8), a liquid supply pipeline P and a liquid return pipeline O; when the upright post is initially supported, the reversing valve (1) is positioned at the A position, the lower cavity (7) and the upper cavity (8) of the upright post are communicated with the liquid supply pipeline P, the initial support force of the upright post is the product of the difference of the annular cavity areas of the lower cavity (7) and the upper cavity (8) of the upright post and the liquid supply pressure of the liquid supply pipeline P, the support resistance is lower when the upright post initially works, and the aim of low initial support force of the upright post is fulfilled; when the upright post (6) descends, the reversing valve (1) is positioned at the C position, the upright post upper cavity (8) is communicated with the liquid supply pipeline P, the upright post lower cavity (7) is communicated with the liquid return pipeline O, the hydraulic control one-way valve (2) is under the pressure action of the upright post upper cavity (8), the upright post lower cavity (7) is communicated with the liquid return pipeline O, the upright post (6) descends, and the sequence valve (3) and the hydraulic control reversing valve (5) do not act due to the fact that the pressure of the upright post lower cavity is lower; when the upright column normally works, the reversing valve (1) is positioned at the B position, the upper cavity (8) of the upright column is communicated with the liquid supply pipeline P, the lower cavity (7) of the upright column is sealed, the pressure of the lower cavity (7) of the upright column rises along with the increase of external load, when the pressure of the lower cavity (7) of the upright column reaches the set pressure, the sequence valve (3) acts, the hydraulic reversing valve (5) reverses, the E port of the hydraulic reversing valve (5) is communicated, the upper cavity (8) of the upright column is communicated with the liquid return port O, and the support resistance of the upright column continues to increase along with the increase of; when the pressure of the lower cavity (7) of the stand column reaches the set pressure of the safety valve (4), the safety valve (4) is opened, the support resistance of the stand column reaches the rated working resistance, the initial support resistance of the stand column is low, and the purpose of automatically adjusting the support resistance according to load changes is achieved.
FIG. 2 shows the principle of automatic pressure switching during resistance-increasing support of a column, and curve 1 is a resistance curve of the column support when an upper chamber of the column is connected with a pressure pipeline at an outlet of a pump station; and the curve 2 is a supporting resistance curve of the upright column when the upper cavity of the upright column is connected with the liquid return port of the pump station.
In the initial support stage of the hydraulic support, the upper cavity and the lower cavity of the upright post are connected with an outlet pressure pipeline of an emulsion pump station, and the initial support pressure of the upper cavity and the lower cavity of the upright post is the pump station pressure P0Support area S of lower cavity of upright post1Support area S of upper cavity of upright column2Initial supporting force of the upright column; when the upright column is loaded, under the action of external load, the pressure P in lower cavity of upright column is continuously increased from original P0Increase to the sequence valve set pressure P2I.e. (P)2Normal specific column safety valve opening pressure PmaxLow 2MPa, i.e.) the column upper cavity pressure is always P0The supporting resistance of the upright column is continuously increased along the real line segment of the curve 1 (the equation of the curve 1); when the pressure of the lower cavity of the upright column reaches P2When the system is in use, the sequence valve is opened, the hydraulic reversing valve is operated, the upper cavity of the upright post is communicated with the liquid return port, and the pressure of the lower cavity of the upright post is (system back pressure); then, the pressure of the lower cavity of the upright column is increased along with the increase of external load, and the supporting resistance of the upright column is continuously increased along the solid line segment of the curve 2 (the equation of the curve 2); when the pressure of the lower cavity of the upright column is from P1When the opening pressure of the safety valve is increased, the safety valve is opened, and the upright post reaches the working resistance.
Through the mode, the stand column achieves the maximum working resistance through the peak working resistance of the curve 1, peak power assisting is achieved, and the two peak working resistances are different. Through pressure switching, the support with small initial supporting force and large working resistance is realized, the variation range of the support resistance is large, and the adaptability of the hydraulic support is strong.
The above-mentioned embodiments are intended to describe the effective implementation of the present invention, and not to limit the scope of the present invention, and various modifications and improvements of the present invention by those skilled in the art should fall within the protection scope of the present invention defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (2)
1. An adaptive control system for the pressure of an upright column comprises a reversing valve (1), a hydraulic control one-way valve (2), a sequence valve (3), a safety valve (4), a hydraulic control reversing valve (5), an upright column (6), a liquid supply pipeline P and a liquid return pipeline O; the reversing valve (1) is a three-position four-way electro-hydraulic reversing valve, and the reversing valve (1) has three reversing positions, namely an A position, a B position and a C position; the hydraulic reversing valve (5) is a two-position four-way valve, when the upright post is initially supported, the reversing valve (1) is at the A position, the hydraulic reversing valve (5) is at the D position, the lower cavity (7) and the upper cavity (8) of the upright post are communicated with the liquid supply pipeline P, the initial supporting force of the upright post is the product of the difference of the annular cavity areas of the lower cavity (7) and the upper cavity (8) of the upright post and the liquid supply pressure of the liquid supply pipeline P, and the supporting resistance is lower when the upright post initially works; when the upright post normally works, the reversing valve (1) is at the B position, the upright post upper cavity (8) is communicated with the liquid supply pipeline P, the upright post lower cavity (7) cannot return liquid, the pressure of the upright post lower cavity (7) is increased along with the increase of external load, when the pressure of the upright post lower cavity (7) reaches the set pressure, the sequence valve (3) acts, after the hydraulic reversing valve (5) receives a signal, when the pressure of the hydraulic reversing valve (5) reaches the set pressure of the hydraulic reversing valve (5), the hydraulic reversing valve (5) is at the E position, the upright post upper cavity (8) is communicated with the liquid return pipeline O, and the first peak supporting resistance of the upright post (6) is the sum of the pressure of the upright post lower cavity (7) and the annular cavity area of the upright post lower cavity (7) minus the annular cavity area of the upright; the supporting resistance of the stand column continues to increase along with the increase of external load, when the pressure of the lower cavity (7) of the stand column reaches the opening pressure of the safety valve (4), the safety valve (4) is opened, the secondary peak supporting resistance of the stand column (6) is obtained by multiplying the opening pressure of the safety valve (4) of the lower cavity (7) of the stand column by the area of the annular cavity of the upper cavity of the stand column by the back pressure of a system, the supporting resistance of the stand column reaches the rated working resistance, the lower initial supporting force of the stand column is realized.
2. The adaptive column pressure control system according to claim 1, characterized in that: when the upright post (6) descends, the reversing valve (1) is at the C position, the upright post upper cavity (8) is communicated with the liquid supply pipeline P, the hydraulic control one-way valve (2) is under the pressure action of the upright post upper cavity (8), the upright post lower cavity (7) is communicated with the liquid return pipeline O, and the upright post (6) descends, and the sequence valve (3) and the hydraulic reversing valve (5) do not act due to the fact that the pressure of the upright post lower cavity is small.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910661380.6A CN110410115B (en) | 2019-07-22 | 2019-07-22 | Self-adaptive control system for pressure of stand column |
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| CN201910661380.6A CN110410115B (en) | 2019-07-22 | 2019-07-22 | Self-adaptive control system for pressure of stand column |
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| CN110410115B true CN110410115B (en) | 2020-11-17 |
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2019
- 2019-07-22 CN CN201910661380.6A patent/CN110410115B/en active Active
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