Liquid supply system for fully mechanized mining working face

Abstract

The present invention discloses a liquid supply system for a fully mechanized mining working face, which includes a fully mechanized mining working face, a first chute, a second chute, a third chute, a liquid supply device, and a plurality of hydraulic supports. The first chute and the second chute are spaced apart at both ends of the fully mechanized mining working face. The first chute and the second chute are both transport chute, and the third chute is located in the middle of the fully mechanized mining working face. The liquid supply device is arranged in the third chute, and the liquid supply device includes a pump station, a liquid supply pipe, and a liquid return pipe. Each of the first chute, the second chute, the third chute, and the fully mechanized mining working face is provided with a plurality of the hydraulic supports, and each of the hydraulic supports is connected to the pump station via the liquid supply pipe and the liquid return pipe. The fully mechanized mining working face liquid supply system of the embodiment of the present invention has the advantages of low pressure drop in the liquid supply pipe, guaranteed liquid supply flow and pressure, and normal movement of the hydraulic supports, and meets the needs of ultra-long working faces.

Description

Technical Field

[0001] The present invention relates to the technical field of mining support equipment manufacturing, and in particular to a fully mechanized mining working face fluid supply system. Background Art

[0002] To improve mining efficiency and resource recovery, ultra-long fully mechanized mining faces are a key development direction for fully mechanized mining technology. Currently, the length of ultra-long fully mechanized mining faces has been continuously increased from approximately 300 meters to a 450-meter fully mechanized mining face. The primary problem with ultra-long mining faces is the length of the fluid supply pipelines. The large length of the fluid supply pipelines and the local pressure drop caused by the joints on the pipelines can lead to uncoordinated movement of multiple hydraulic supports. For ultra-long mining faces, the current main approach to addressing this pressure drop is to increase the diameter or number of system pipelines. However, due to limitations in installation space and pipeline specifications, especially in ultra-long fully mechanized mining faces over 600 meters long, the hydraulic support requires an exponentially increased amount of fluid when cutting coal using dual shearers. The resulting long-distance fluid supply problem remains unresolved. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a fully mechanized mining face liquid supply system with reduced liquid supply pipe pressure.

[0004] The fully mechanized mining face liquid supply system of the embodiment of the present invention includes a fully mechanized mining face, a first chute, a second chute, a third chute, a liquid supply device, and a plurality of hydraulic supports. The first chute and the second chute are spaced apart and arranged at both ends of the fully mechanized mining face. The first chute and the second chute are both transport chute. The third chute is located in the middle of the fully mechanized mining face.

[0005] The liquid supply device is arranged in the third chute, and the liquid supply device includes a pump station, a liquid supply pipe and a liquid return pipe;

[0006] Each of the first drift, the second drift, the third drift and the fully mechanized mining working face is provided with a plurality of hydraulic supports, and each hydraulic support is connected to the pump station through the liquid supply pipe and the liquid return pipe.

[0007] In some embodiments, the liquid supply pipe includes a first pipeline and a second pipeline that are connected, the first pipeline is arranged in the third inclined groove, the second pipeline is arranged in the fully mechanized mining working face, the second pipeline is a closed annular pipeline, the second pipeline includes a first pipe section and a second pipe section that are arranged at intervals along the extension direction of the third inclined groove, the liquid supply pipe also includes a plurality of first connecting pipes, the plurality of first connecting pipes are arranged at intervals along the length direction of the fully mechanized mining working face, one end of the first connecting pipe is connected to the first pipe section, and the other end of the first connecting pipe is connected to the second pipe section; and / or

[0008] The return liquid pipe includes a connected third pipeline and a fourth pipeline. The third pipeline is arranged in the third inclined groove, and the fourth pipeline is arranged in the fully mechanized mining working face. The fourth pipeline is a closed annular pipeline. The fourth pipeline includes a third pipe section and a fourth pipe section arranged at intervals along the extension direction of the third inclined groove. The return liquid pipe also includes a plurality of second connecting pipes. The plurality of second connecting pipes are arranged at intervals along the length direction of the fully mechanized mining working face. One end of the second connecting pipe is connected to the third pipe section, and the other end of the second connecting pipe is connected to the fourth pipe section.

[0009] In some embodiments, there are multiple first pipelines, and each first pipeline is connected to the second pipeline; and / or

[0010] There are a plurality of third pipelines, and each of the third pipelines is communicated with the fourth pipeline.

[0011] In some embodiments, a fluid replenishing device is further included, the fluid replenishing device including a first accumulator group, a one-way valve, a cartridge valve, and a control system, the one-way valve having a first liquid inlet and a first liquid outlet, the first liquid inlet being connected to the liquid supply pipe, and the first liquid outlet being connected to the first accumulator group;

[0012] The cartridge valve has a second liquid inlet and a second liquid outlet, the second liquid inlet is in communication with the first accumulator group, and the second liquid outlet is in communication with the liquid supply pipe, and the control system is used to control the cartridge valve to switch between the first state and the second state;

[0013] When the pressure at the second liquid inlet is greater than or equal to a first preset value P1, and the pressure at the second liquid outlet is less than or equal to a second preset value P2, the cartridge valve is in the first state, and the second liquid inlet is connected to the second liquid outlet, wherein the first preset value P1 is greater than the second preset value P2;

[0014] When the pressure of the second liquid inlet is less than the first preset value P1, and / or the pressure of the second liquid outlet is greater than the second preset value P2, the cartridge valve is in the second state, and the second liquid inlet is disconnected from the second liquid outlet.

[0015] In some embodiments, the first preset value P1 is greater than or equal to 25 MPa, and the second preset value P2 is less than or equal to 18 MPa.

[0016] In some embodiments, the control system includes a first pressure sensor, a second pressure sensor, and an electro-hydraulic control valve.

[0017] The first pressure sensor is provided between the first accumulator group and the second liquid inlet, and the second pressure sensor is provided between the second liquid outlet and the liquid supply pipe;

[0018] The first pressure sensor and the second pressure sensor are both connected to the electro-hydraulic control valve signal;

[0019] When the detection value of the first pressure sensor is greater than or equal to a first preset value P1, and when the detection value of the second pressure sensor is less than or equal to a second preset value P2, the cartridge valve is in the first state; when the detection value of the first pressure sensor is less than the first preset value P1, and / or the detection value of the second pressure sensor is greater than the second preset value P2, the cartridge valve is in the second state.

[0020] In some embodiments, the electro-hydraulic control valve has a working port, a third liquid inlet and a third liquid outlet, and the cartridge valve also has a control port. The working port is connected to the control port. In the first state, the working port is connected to the third liquid outlet. In the second state, the working port is connected to the third liquid inlet.

[0021] In some embodiments, the third liquid inlet is communicated with the first accumulator group, and the third liquid outlet is communicated with the liquid return pipe.

[0022] In some embodiments, the system further includes a second accumulator group, wherein the second accumulator group is in communication with the liquid supply pipe.

[0023] In some embodiments, a third accumulator group is further included, wherein the third accumulator group includes a plurality of accumulators, the plurality of accumulators correspond one-to-one to a plurality of hydraulic supports, and each of the accumulators is connected to a liquid inlet of a corresponding hydraulic support.

[0024] The liquid supply system for the comprehensive mining working face of the embodiment of the present invention realizes the zoning setting of the comprehensive mining working face by setting a third chute and setting the third chute in the middle of the comprehensive mining working face. When the comprehensive mining working face is an extra-long working face, the third chute can divide the extra-long working face into two regular length areas, which can greatly reduce or even avoid the problem of pressure drop in the liquid supply pipe caused by the excessive length of the liquid supply pipe in the extra-long working face. The liquid replenishing device quickly releases the stored high-pressure liquid when the system uses a large amount of liquid, meeting the simultaneous working requirements of multiple hydraulic supports. Each hydraulic support is connected to an accumulator. When the system pressure is high, the accumulator on the hydraulic support is replenished. When working, the accumulator on the hydraulic support and the liquid supply system jointly supply liquid to meet the mining needs of the extra-long working face.

[0025] Therefore, the liquid supply system for the fully mechanized mining working face of the embodiment of the present invention has the advantages of reducing the pressure in the liquid supply pipe, ensuring the liquid supply flow and pressure and the normal movement of the hydraulic support, and meeting the needs of the ultra-long working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of a liquid supply system for a fully mechanized mining working face according to an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the partial structure of the liquid supply system of the fully mechanized mining working face according to an embodiment of the present invention.

[0028] Figure 3 This is a structural diagram of the liquid replenishing device of the fully mechanized mining working face liquid supply system according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Fully mechanized mining face fluid supply system 100;

[0031] Comprehensive mining face 1;

[0032] First chute 201; second chute 202; third chute 203;

[0033] Liquid supply device 3; pump station 301; liquid supply pipe 302; first pipeline 3021; ​​second pipeline 3022; first pipe section 30221; second pipe section 30222; first connecting pipe 3023; liquid return pipe 303; third pipeline 3031; fourth pipeline 3032; third pipe section 30321; fourth pipe section 30322; second connecting pipe 3033; filter 304;

[0034] Hydraulic support 4;

[0035] Fluid replenishing device 5; first accumulator group 501; one-way valve 502; first liquid inlet 5021; first liquid outlet 5022; cartridge valve 503; second liquid inlet 5031; second liquid outlet 5032; control port 5033; first pressure sensor 504; second pressure sensor 505; electro-hydraulic control valve 506; working port 5061; third liquid inlet 5062; third liquid outlet 5063;

[0036] Second energy storage group 6 . DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0039] like Figures 1 to 3As shown, the fully mechanized mining face liquid supply system 100 of the embodiment of the present invention includes a fully mechanized mining face 1, a first chute 201, a second chute 202, a third chute 203, a liquid supply device 3, and a plurality of hydraulic supports 4. The first chute 201 and the second chute 202 are spaced apart at both ends of the fully mechanized mining face 1. The first chute 201 and the second chute 202 are both transport chute. The third chute 203 is located in the middle of the fully mechanized mining face 1, and the liquid supply device 3 is located in the third chute 203. The liquid supply device 3 includes a pump station 301, a liquid supply pipe 302, and a liquid return pipe 303. Each of the first chute 201, the second chute 202, the third chute 203, and the fully mechanized mining face 1 is provided with a plurality of hydraulic supports 4. Each hydraulic support 4 is connected to the pump station 301 via a liquid supply pipe 302 and a liquid return pipe 303.

[0040] For example, Figure 1 As shown, the length of the fully mechanized mining face 1 is oriented horizontally, while the length of the drift is oriented front-to-back. The first drift 201 and the second drift 202 are spaced apart in the horizontal direction, and the third drift 203 divides the fully mechanized mining face 1 into two left and right halves. The first and second drifts 201 and 202 serve as transport chutes, each equipped with a transfer machine for transporting coal. The third drift 203 serves as a material lane, with a fluid supply device 3 installed within it. The hydraulic supports 4 located in the left and right halves are connected to the pump station 301 within the third drift 203 via a fluid supply pipe 302 and a fluid return pipe 303.

[0041] The fully mechanized mining face liquid supply system 100 of the embodiment of the present invention implements a partitioned arrangement of the fully mechanized mining face 1 by providing a third chute 203, which is positioned in the middle of the fully mechanized mining face 1. When the fully mechanized mining face 1 is an extra-long face, the third chute 203 can divide the extra-long face into two areas of regular length. This can significantly reduce or even eliminate the pressure drop in the liquid supply pipe 302 caused by the excessive length of the extra-long face, thus meeting the mining needs of the extra-long face.

[0042] Therefore, the fully mechanized mining working face liquid supply system 100 according to the embodiment of the present invention has advantages such as low pressure drop in the liquid supply pipe 302 .

[0043] In addition, the third chute 203 located in the middle of the comprehensive mining working face 1 is a material lane and can also be used for personnel to walk. When the equipment in the first chute 201 or the second chute 202 fails, maintenance personnel can quickly reach the first chute 201 and the second chute 202 through the third chute 203, reducing the problem of the maintenance process route being too long.

[0044] In some embodiments, the liquid supply pipe 302 includes a first pipeline 3021 and a second pipeline 3022 that are connected. The first pipeline 3021 is located within the third chute 203, and the second pipeline 3022 is located within the fully mechanized mining face 1. The second pipeline 3022 is a closed annular pipeline. The second pipeline 3022 includes a first pipe section 30221 and a second pipe section 30222 spaced apart along the extension direction of the third chute 203. The liquid supply pipe 302 also includes a plurality of first connecting pipes 3023 spaced apart along the length of the fully mechanized mining face 1. One end of the first connecting pipe 3023 is connected to the first pipe section 30221, and the other end of the first connecting pipe 3023 is connected to the second pipe section 30222.

[0045] For example, Figure 1 As shown, the first pipeline 3021 is arranged in the fore-aft direction within the third chute 203, and the second pipeline 3022 is arranged in a ring shape within the fully-mechanized mining face 1. One end of the first pipeline 3021 is connected to the pump station 301, and the other end of the first pipeline 3021 is connected to the second pipeline 3022. The hydraulic supports 4 within the third chute 203 are connected to the first pipeline 3021, and the hydraulic supports 4 within the first chute 201, the second chute 202, and the fully-mechanized mining face 1 are all connected to the second pipeline 3022. The first pipe section 30221 and the second pipe section 30222 are spaced apart in the fore-aft direction, with the first pipe section 30221 located in front of the second pipe section 30222. Multiple first connecting pipes 3023 are spaced apart in the left-right direction, with the front end of the first connecting pipe 3023 connected to the first pipe section 30221 and the rear end of the first connecting pipe 3023 connected to the second pipe section 30222.

[0046] The comprehensive mining working face liquid supply system 100 of the embodiment of the present invention is configured by arranging multiple first connecting pipes 3023 on the closed ring-shaped second pipeline 3022, so that the second pipeline 3022 and the first connecting pipes 3023 are arranged in a ladder shape to form multiple loop liquid supply networks, thereby reducing the liquid resistance in the second pipeline 3022 located in the comprehensive mining working face 1, thereby greatly reducing the pressure drop of the hydraulic oil in the second pipeline 3022, thereby further reducing the pressure drop of the liquid supply pipe 302 of the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention.

[0047] In some embodiments, the return liquid pipe 303 includes a connected third pipeline 3031 and a fourth pipeline 3032, the third pipeline 3031 is arranged in the third chute 203, and the fourth pipeline 3032 is arranged in the comprehensive mining working face 1. The fourth pipeline 3032 is a closed ring pipeline. The fourth pipeline 3032 includes a third pipe section 30321 and a fourth pipe section 30322 arranged at intervals along the extension direction of the third chute 203. The return liquid pipe 303 also includes a plurality of second connecting pipes 3033, and the plurality of second connecting pipes 3033 are arranged at intervals along the length direction of the comprehensive mining working face 1. One end of the second connecting pipe 3033 is connected to the third pipe section 30321, and the other end of the second connecting pipe 3033 is connected to the fourth pipe section 30322.

[0048] For example, Figure 1 As shown, the third pipeline 3031 is arranged in the fore-aft direction within the third chute 203, and the fourth pipeline 3032 is arranged in a ring shape within the fully-mechanized mining face 1. One end of the third pipeline 3031 is connected to the pump station 301, and the other end of the third pipeline 3031 is connected to the fourth pipeline 3032. The hydraulic supports 4 within the third chute 203 are connected to the third pipeline 3031, and the hydraulic supports 4 within the first chute 201, the second chute 202, and the fully-mechanized mining face 1 are all connected to the fourth pipeline 3032. The third pipe section 30321 and the fourth pipe section 30322 are arranged at intervals in the fore-aft direction, with the third pipe section 30321 located in front of the fourth pipe section 30322. Multiple second connecting pipes 3033 are arranged in the left-right direction at intervals, with the front ends of the second connecting pipes 3033 connected to the third pipe section 30321 and the rear ends of the second connecting pipes 3033 connected to the fourth pipe section 30322.

[0049] The comprehensive mining working face liquid supply system 100 of the embodiment of the present invention is configured with a plurality of second connecting pipes 3033 on the annular fourth pipeline 3032, so that the fourth pipeline 3032 and the second connecting pipes 3033 are arranged in a ladder shape to form a plurality of loop liquid supply networks, thereby reducing the liquid resistance of the hydraulic oil in the fourth pipeline 3032, thereby greatly reducing the pressure drop of the hydraulic oil in the fourth pipeline 3032, and further reducing the pressure drop of the return pipe 303 of the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention.

[0050] Optionally, there are multiple first pipelines 3021 , and each first pipeline 3021 is connected to the second pipeline 3022 .

[0051] For example, Figure 1As shown, there are two first pipelines 3021: one first pipeline 3021 is connected to the first pipeline section 30221, and the other first pipeline 3021 is connected to the second pipeline section 30222. By providing multiple liquid supply pipes 302 connected to the second pipeline 3022 at different locations, it is further helpful to reduce the pressure drop caused by the long path of the second pipeline 3022, thereby helping to reduce the pressure drop within the liquid supply pipe 302.

[0052] Optionally, there are multiple third pipelines 3031 , and each third pipeline 3031 is connected to the fourth pipeline 3032 .

[0053] For example, Figure 1 As shown, there are two third pipelines 3031, one third pipeline 3031 is connected to the third pipeline section 30321, and the other third pipeline 3031 is connected to the third pipeline section 30321. By providing multiple liquid supply pipes 302 connected to the fourth pipeline 3032 at different positions, it is helpful to reduce the pressure drop caused by the long path of the fourth pipeline 3032, and further help reduce the pressure drop in the return liquid pipe 303.

[0054] The comprehensive mining working face liquid supply system 100 of the embodiment of the present invention also includes a liquid replenishing device 5, which includes a first accumulator group 501, a one-way valve 502, a cartridge valve 503 and a control system. The one-way valve 502 has a first liquid inlet 5021 and a first liquid outlet 5022. The first liquid inlet 5021 is connected to the liquid supply pipe 302, and the first liquid outlet 5022 is connected to the first accumulator group 501. The first accumulator group 501 includes multiple accumulators, and the multiple accumulators are connected to each other.

[0055] The control system is used to control the cartridge valve 503 to switch between a first state and a second state. When the pressure at the second liquid inlet 5031 is greater than or equal to a first preset value P1, and the pressure at the second liquid outlet 5032 is less than or equal to a second preset value P2, the cartridge valve 503 is in the first state, and the second liquid inlet 5031 is connected to the second liquid outlet 5032. When the pressure at the second liquid inlet 5031 is less than the first preset value P1, and / or the pressure at the second liquid outlet 5032 is greater than the second preset value P2, the cartridge valve 503 is in the second state, and the second liquid inlet 5031 is disconnected from the second liquid outlet 5032. The first preset value P1 is greater than the second preset value P2.

[0056] When the pressure of the second liquid inlet 5031 is less than the first preset value P1, and / or the pressure of the second liquid outlet 5032 is greater than the second preset value P2, it can be understood that the control system controls the plug-in valve 503 to be in the second state when at least one of the requirements of the pressure of the second liquid inlet 5031 being less than the first preset value P1 and the pressure of the second liquid outlet 5032 being greater than the second preset value P2 is met.

[0057] The fully mechanized mining face liquid supply system 100 of the embodiment of the present invention is divided into three stages during operation, namely, a liquid filling stage, a stabilization stage, and a liquid replenishment stage.

[0058] During the filling stage, the hydraulic support 4 does not require hydraulic oil with too high pressure and flow. The hydraulic oil in the liquid supply pipe 302 will flow into the one-way valve 502 through the first liquid inlet 5021 and flow into the first accumulator group 501 through the first liquid outlet 5022 for energy storage. At this time, the control system controls the cartridge valve 503 to be in the second state, the second liquid inlet 5031 is disconnected from the second liquid outlet 5032, and the hydraulic oil stored in the first accumulator group 501 will not flow back through the cartridge valve 503.

[0059] In the stable stage, the pressures at the first liquid inlet 5021 and the first liquid outlet 5022 reach equilibrium, and the liquid supply pipe 302 stops filling the first accumulator group 501 with liquid.

[0060] During the fluid replenishment stage, when the pressure of the second liquid inlet 5031 is greater than or equal to the first preset value P1, and the pressure of the second liquid outlet 5032 is less than or equal to the second preset value P2, and the pressure in the liquid supply pipe 302 drops and needs fluid replenishment, the control system controls the cartridge valve 503 to be in the first state, the second liquid inlet 5031 and the second liquid outlet 5032 are connected, and the hydraulic oil stored in the first accumulator group 501 during the fluid filling stage enters the cartridge valve 503 through the second liquid inlet 5031, and enters the liquid supply pipe 302 through the second liquid outlet 5032.

[0061] It is understood that the flow rate of the cartridge valve 503 can reach 1000 L / min, and the diameter can reach 200-250 mm. Utilizing this characteristic of the cartridge valve 503, the hydraulic oil stored in the first accumulator group 501 can quickly enter the liquid supply pipe 302, compensating for the supply pressure of the liquid supply pipe 302. The hydraulic oil entering the liquid supply pipe 302 from the first accumulator group 501 merges with the discharge from the pump station 301, quickly establishing pressure equilibrium. When the amount of liquid used in the liquid supply pipe 302 is less than the amount of liquid supplied, the pressure in the liquid supply pipe 302 rises. When the pressure in the liquid supply pipe 302 exceeds the pressure of the first accumulator group 501, the first accumulator group 501 is charged.

[0062] Therefore, the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention uses the plug-in valve 503 to quickly return the hydraulic oil stored in advance in the first accumulator group 501 to the liquid supply pipe 302, quickly compensate the liquid supply pipe 302, and have a fast response speed; in addition, by adopting the above method, there is no need to frequently adjust the speed of the pump station 301, which is beneficial to improving the service life of the pump station 301.

[0063] Therefore, the fully mechanized mining face liquid supply system 100 of the embodiment of the present invention also has the advantages of fast response speed and long service life.

[0064] In some embodiments, the first preset value P1 is greater than or equal to 25 MPa, and the second preset value P2 is less than or equal to 18 MPa.

[0065] It is understood that the rated pressure provided by pump station 1 is generally 31.5 MPa. Setting P2 to 18 MPa or less, which is significantly less than 31.5 MPa, indicates that the pressure in supply pipe 2 has dropped to the point of insufficient supply. At this point, the first accumulator group 501 needs to compensate for the pressure in supply pipe 2. Setting the first preset value P1 to 25 MPa or greater ensures that the first accumulator group 501 has sufficient hydraulic oil pressure to replenish supply pipe 2.

[0066] Therefore, by setting the first preset value P1 to be greater than or equal to 25 MPa and the second preset value P2 to be less than or equal to 18 MPa, when the pressure in the liquid supply pipe 2 drops within a certain range, there is hydraulic oil with sufficient pressure in the first accumulator group 501 to compensate the liquid supply pipe 2, which is beneficial to improving the working reliability of the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention.

[0067] In some embodiments, the control system includes a first pressure sensor 504, a second pressure sensor 505, and an electro-hydraulic control valve 506. The first pressure sensor 504 is disposed between the first accumulator group 501 and the second liquid inlet 5031, and the second pressure sensor 505 is disposed between the second liquid outlet 5032 and the liquid supply pipe 302. Both the first pressure sensor 504 and the second pressure sensor 505 are signal-connected to the electro-hydraulic control valve 506.

[0068] The electro-hydraulic control valve 506 has a working port 5061, a third liquid inlet 5062 and a third liquid outlet 5063. The cartridge valve 503 also has a control port 5033. The working port 5061 is connected to the control port 5033. In the first state, the working port 5061 is connected to the third liquid outlet 5063. In the second state, the working port 5061 is connected to the third liquid inlet 5062.

[0069] When the detection value of the first pressure sensor 504 is greater than or equal to the first preset value P1, and when the detection value of the second pressure sensor 505 is less than or equal to the second preset value P2, the cartridge valve 503 is in the first state; when the detection value of the first pressure sensor 504 is less than the first preset value P1, and / or the detection value of the second pressure sensor 505 is greater than the second preset value P2, the cartridge valve 503 is in the second state.

[0070] For example, the electro-hydraulic control valve 506 includes a solenoid pilot valve and a main valve. The main valve is provided with a working port 5061, a third liquid inlet 5062, and a third liquid outlet 5063. The first and second pressure sensors 504 and 505 are connected to the solenoid pilot valve via PLC signals. The first pressure sensor 504 detects the hydraulic oil pressure at the second liquid inlet 5031, while the second pressure sensor 505 detects the hydraulic oil pressure at the second liquid outlet 5032.

[0071] The first and second pressure sensors 504 and 505 transmit detection signals to the PLC. The PLC then determines the detection values ​​of the first and second pressure sensors 504 and 505. If the detection value of the first pressure sensor 504 is greater than or equal to the first preset value P1, and the detection value of the second pressure sensor 505 is less than or equal to the second preset value P2, the PLC de-energizes the solenoid pilot valve of the electro-hydraulic control valve 506. This connects the working port 5061 of the main valve to the third liquid outlet 5063, causing a loss of pressure in the control port 5033 of the cartridge valve 503. This opens the valve core of the cartridge valve 503, connecting the second liquid inlet 5031 and the second liquid outlet 5032 of the cartridge valve 503. The hydraulic oil in the first accumulator group 501 flows through the cartridge valve 503 into the liquid supply pipe 302 for compensation.

[0072] Therefore, the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention sets an electro-hydraulic control valve 506 in the control system, and regulates it based on the pressure difference between the second liquid inlet 5031 and the second liquid outlet 5032 of the plug-in valve 503. The triggering condition can be flexibly set according to the actual situation of the comprehensive mining working face 1, so that the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention is easy to control.

[0073] In some embodiments, the third liquid inlet 5062 is in communication with the first accumulator group 501 , and the third liquid outlet 5063 is in communication with the liquid return pipe 303 .

[0074] like Figure 3As shown, it can be understood that the cartridge valve 503 is disconnected only when the oil pressure at the control port 5033 is greater than the oil pressure at the third liquid inlet 5062, and is connected only when the oil pressure at the control port 5033 is less than the oil pressure at the third liquid inlet 5062. The third liquid inlet 5062 is connected to the first accumulator group 501, and the third liquid outlet 5063 is connected to the return pipe 303. In other words, when the solenoid pilot valve is energized, the third liquid inlet 5062 is connected to the working port 5061, and the working port 5061 is connected to the control port 5033. The oil pressure at the control port 5033 and the oil pressure at the second liquid inlet 5031 are always equal. However, because the valve core of the cartridge valve 503 still has spring force, the valve core of the cartridge valve 503 is in a closed state, and the cartridge valve 503 is in a disconnected state. When the electromagnetic pilot valve is in a power-off state, the working port 5061 is connected to the third liquid return port, the control port 5033 loses pressure, the valve core of the cartridge valve 503 is in an open state, the second liquid inlet 5031 is connected to the second liquid outlet 5032, and the cartridge valve 503 is in an open state.

[0075] Therefore, the third liquid inlet 5062 of the electro-hydraulic control valve 506 is connected to the first accumulator group 501, so that the first accumulator group 501 provides control liquid to the electro-hydraulic control valve 506. There is no need to set a certain pressure of control liquid to separately control the electro-hydraulic control valve 506, thereby making the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention simple in structure and low in manufacturing cost.

[0076] In some embodiments, the liquid supply pipe 302 and the liquid return pipe 303 each have a plurality of liquid supply pipes 302 and a plurality of liquid return pipes 303 corresponding one to one, and each liquid supply pipe 302 is provided with at least one liquid replenishing device 5 .

[0077] For example, Figure 2 As shown, there are two liquid supply pipes 302 and liquid return pipes 303, and each liquid supply pipe 302 is provided with a liquid replenishing device 5. Of course, the liquid supply pipe 302 and liquid return pipe 303 are set in the form of three inlets and three returns, and the specific number of settings can be reasonably set according to needs.

[0078] During use of the comprehensive mining working face liquid supply system 100 of the present invention, when the pressure of the liquid supply pipe 302 decreases, each liquid replenishing device 5 is started in sequence at intervals of a certain time, which is beneficial to reducing the impact of the large forward flow on the liquid supply pipe 302, thereby helping to improve the safety of use of the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention.

[0079] In some embodiments, the fully mechanized mining working face liquid supply system 100 of the embodiment of the present invention further includes a second accumulator group 6 , and the second accumulator group 6 is connected to the liquid supply pipe 302 .

[0080] For example, Figure 1As shown, during the rehydration phase, the first accumulator is used to quickly compensate for the pressure in the liquid supply pipe 302, thereby increasing the pressure. The second accumulator group 6 absorbs the impact of the first accumulator during the rehydration process and is used to stabilize the pressure in the liquid supply pipe 302, thereby reducing pressure fluctuations in the liquid supply pipe 302. The interaction between the two facilitates improved operational reliability of the fully mechanized mining face liquid supply system 100 according to the embodiment of the present invention.

[0081] In some embodiments, the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention also includes a third accumulator group, which includes multiple accumulators, and the multiple accumulators correspond one-to-one to multiple hydraulic supports 4, and each accumulator is connected to the liquid inlet of the corresponding hydraulic support 4.

[0082] For example, Figure 1 As described above, each hydraulic support 4 is connected to the liquid supply pipe 302 through a one-way valve, and an accumulator is arranged on each hydraulic support 4, which forms a centralized-distributed pressure-stabilized liquid supply mode together with the second accumulator group 6, which is beneficial to improving the liquid supply stability of the comprehensive mining working face liquid supply system 100 of the embodiment of the present invention.

[0083] In some embodiments, the fully mechanized mining working face liquid supply system 100 of the embodiment of the present invention further includes a filter 304, which is provided on the liquid supply pipe 302 to filter the hydraulic oil entering the hydraulic support 4, thereby preventing impurities in the hydraulic oil from entering the hydraulic support 4 and affecting the normal operation of the hydraulic support 4, thereby further improving the working reliability of the fully mechanized mining working face liquid supply system 100 of the embodiment of the present invention.

[0084] Optionally, the electro-hydraulic control valve 506 is a two-position three-way solenoid valve.

[0085] Optionally, the cartridge valve 503 is a two-way cartridge valve 503 .

[0086] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0088] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0089] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0090] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0091] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those skilled in the art are all within the scope of protection of the present invention.

Claims

1. A fully mechanized mining working face liquid supply system, characterized in that: include: fully mechanized mining face; a first drift, a second drift and a third drift, wherein the first drift and the second drift are arranged at two ends of the fully mechanized mining face at intervals, the first drift and the second drift are both transport drifts, and the third drift is located in the middle of the fully mechanized mining face; A liquid supply device, the liquid supply device is arranged in the third chute, and the liquid supply device includes a pump station, a liquid supply pipe and a liquid return pipe; as well as A plurality of hydraulic supports, each of the first drift, the second drift, the third drift and the fully mechanized mining working face is provided with a plurality of the hydraulic supports, each of the hydraulic supports being connected to the pump station via the liquid supply pipe and the liquid return pipe; The liquid supply pipe includes a first pipeline and a second pipeline that are connected, the first pipeline is arranged in the third inclined groove, the second pipeline is arranged in the fully mechanized mining working face, the second pipeline is a closed annular pipeline, the second pipeline includes a first pipe section and a second pipe section that are spaced apart along the extension direction of the third inclined groove, the liquid supply pipe also includes a plurality of first connecting pipes, the plurality of first connecting pipes are spaced apart along the length direction of the fully mechanized mining working face, one end of the first connecting pipe is connected to the first pipe section, and the other end of the first connecting pipe is connected to the second pipe section; and / or The liquid return pipe includes a third pipeline and a fourth pipeline that are connected. The third pipeline is arranged in the third chute, and the fourth pipeline is arranged in the fully mechanized mining working face. The fourth pipeline is a closed annular pipeline. The fourth pipeline includes a third pipe section and a fourth pipe section that are arranged at intervals along the extension direction of the third chute. The liquid return pipe also includes a plurality of second connecting pipes that are arranged at intervals along the length direction of the fully mechanized mining working face. One end of the second connecting pipe is connected to the third pipe section, and the other end of the second connecting pipe is connected to the fourth pipe section. a fluid replenishing device, the fluid replenishing device comprising a first accumulator group, a one-way valve, a cartridge valve, and a control system, the one-way valve having a first liquid inlet and a first liquid outlet, the first liquid inlet being in communication with the liquid supply pipe, and the first liquid outlet being in communication with the first accumulator group; The cartridge valve has a second liquid inlet and a second liquid outlet, the second liquid inlet is in communication with the first accumulator group, and the second liquid outlet is in communication with the liquid supply pipe, and the control system is used to control the cartridge valve to switch between the first state and the second state; When the pressure at the second liquid inlet is greater than or equal to a first preset value P1, and the pressure at the second liquid outlet is less than or equal to a second preset value P2, the cartridge valve is in the first state, and the second liquid inlet is connected to the second liquid outlet, wherein the first preset value P1 is greater than the second preset value P2; When the pressure of the second liquid inlet is less than the first preset value P1, and / or the pressure of the second liquid outlet is greater than the second preset value P2, the cartridge valve is in the second state, and the second liquid inlet is disconnected from the second liquid outlet.

2. The liquid supply system for fully mechanized mining working face according to claim 1, characterized in that: There are multiple first pipelines, and each first pipeline is connected to the second pipeline; and / or There are a plurality of third pipelines, and each of the third pipelines is communicated with the fourth pipeline.

3. The liquid supply system for fully mechanized mining working face according to claim 1, characterized in that: The first preset value P1 is greater than or equal to 25 MPa, and the second preset value P2 is less than or equal to 18 MPa.

4. The liquid supply system for fully mechanized mining working face according to claim 1, characterized in that: The control system includes: a first pressure sensor and a second pressure sensor, wherein the first pressure sensor is disposed between the first accumulator group and the second liquid inlet, and the second pressure sensor is disposed between the second liquid outlet and the liquid supply pipe; and an electro-hydraulic control valve, wherein the first pressure sensor and the second pressure sensor are both connected to the electro-hydraulic control valve signal; When the detection value of the first pressure sensor is greater than or equal to a first preset value P1, and when the detection value of the second pressure sensor is less than or equal to a second preset value P2, the cartridge valve is in the first state; when the detection value of the first pressure sensor is less than the first preset value P1, and / or the detection value of the second pressure sensor is greater than the second preset value P2, the cartridge valve is in the second state.

5. The liquid supply system for fully mechanized mining working face according to claim 4, characterized in that: The electro-hydraulic control valve has a working port, a third liquid inlet and a third liquid outlet. The cartridge valve also has a control port. The working port is connected to the control port. In the first state, the working port is connected to the third liquid outlet. In the second state, the working port is connected to the third liquid inlet.

6. The liquid supply system for fully mechanized mining working face according to claim 5, characterized in that: The third liquid inlet is communicated with the first accumulator group, and the third liquid outlet is communicated with the liquid return pipe.

7. The liquid supply system for fully mechanized mining working face according to claim 1, characterized in that: The device further includes a second accumulator group, which is communicated with the liquid supply pipe.

8. The liquid supply system for fully mechanized mining working face according to claim 7, characterized in that: It also includes a third accumulator group, which includes multiple accumulators. The multiple accumulators correspond to the multiple hydraulic supports one by one, and each accumulator is connected to the liquid inlet of the corresponding hydraulic support.

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