Coal gangue grouting system and control method thereof

Abstract

The invention discloses a coal gangue grouting system. The coal gangue grouting system comprises a ball mill, a reservoir, a slurrying tank and a plurality of grouting wells. According to the control method of the coal gangue grouting system, the controller adjusts the opening degree of the first adjusting valve and the opening degree of the second adjusting valve according to received data of the first concentration detector and the second concentration detector. The device has the advantages that the first concentration meter and the second concentration meter are arranged to detect the outlet slurry concentrations of the ball mill and the slurrying tank respectively, and the opening degrees of the first adjusting valve and the second adjusting valve are convenient to adjust; by arranging the flow sensor at the grouting well, the blocking condition of the branch pipe can be detected, when the branch pipe is blocked, the second control valve is closed, the third adjusting valve is opened, water in the reservoir can be introduced into the branch pipe to achieve dredging, and the automation degree is high.

Description

Technical field:

[0001] The invention relates to the technical field of coal gangue grouting, in particular to a coal gangue grouting system and a control method thereof. Background technology:

[0002] During coal mining, the overlying rock strata on the coal seam are affected by mining, ground pressure, and the weight of the rock, and the overlying rock strata are deformed, causing ground subsidence, groundwater level drop, and geological disasters. Therefore, mine filling technology is proposed. Mine filling technology is to fill solid wastes such as coal gangue into the separation space of the goaf or mining area after pulping through a pulping system, so as to achieve effective disposal of gangue and sustainable development of mines. The existing coal gangue pulping system mainly crushes the coal gangue and then uses a ball mill to grind it, and then sends it to the pulping tank for pulping. After pulping, it is directly pumped to each grouting well for grouting through a slurry pump. However, with the operation of the system, the grouting pipe between the slurry pump and the grouting well is prone to blockage, which will affect the smooth progress of grouting; and the existing grouting wells are mainly set vertically. If the terrain above the separation space is complex, it will increase the difficulty of vertical drilling; or if there are farmlands, buildings, etc. on the ground above the separation space, it will involve issues such as land acquisition compensation, which will increase production costs. Summary of the invention:

[0003] The first object of the present invention is to provide a coal gangue grouting system.

[0004] The second object of the present invention is to provide a control method for a coal gangue grouting system.

[0005] The first object of the present invention is implemented by the following technical scheme: a coal gangue grouting system, which includes a ball mill, a water reservoir, a slurry tank and a plurality of grouting wells,

[0006] The outlet of the ball mill is connected to the inlet of the three-way material distribution valve, and a first concentration meter is installed at the outlet of the ball mill; the two outlets of the three-way material distribution valve are respectively connected to the inlets of the two pulping tanks, and the outlets of the two pulping tanks are respectively connected to the inlet of the main pipeline through a first pipeline, and a first control valve and a second concentration meter are sequentially installed on the first pipeline. The main pipeline is connected to the inlet of the grouting pipe of each grouting well through a branch pipe, and a second control valve and a slurry pump are sequentially arranged on the branch pipe;

[0007] The outlet of the water reservoir is communicated with the inlet of the first water pump and the second water pump respectively; the outlet of the first water pump is communicated with the water inlet of the ball mill through a first water pipe, and a first regulating valve is arranged on the first water pipe; the outlet of the second water pump is communicated with the water inlet of each pulping tank through a second water pipe, and a second regulating valve is installed on the second water pipe; the outlet of the water reservoir is communicated with the branch pipe on the outlet side of each second control valve through a third water pipe, and a third regulating valve is installed on the third water pipe; the first concentration meter and the second concentration meter are both connected to the input end of the controller, and the output end of the controller is respectively connected to the first regulating valve and the second regulating valve.

[0008] Furthermore, the grouting well includes a delivery pipe, an outer casing, a grouting pipe and a grouting inclined hole connected to the grouting space, the grouting inclined hole includes a mounting hole and an inclined hole connected up and down, the outer casing is fixed to the inner wall of the mounting hole, and the delivery pipe is separately arranged inside the outer casing; an inlet fixed well is arranged at the orifice position of the mounting hole, the top ends of the outer casing and the grouting pipe are buried in the inlet fixed well, and the bottom outlet of the grouting pipe is connected to the inlet of the inlet fixed well; an outlet fixed well is fixed between the bottom inner wall of the outer casing and the bottom outer wall of the delivery pipe, and the bottom end of the outlet fixed well is connected to the orifice of the inclined hole; a control valve is arranged on the grouting pipe, and a flow sensor is arranged on the grouting pipe below the control valve, the flow sensor is connected to the input end of the controller, and the output end of the controller is connected to the second control valve and the third regulating valve.

[0009] Furthermore, it also includes an axle seat, a rotating shaft and a pull rope. The axle seat is fixed on the outer wall of the grouting pipe, and the horizontally arranged rotating shaft is rotatably provided on the axle seat, and a torsion spring is provided between the rotating shaft and the axle seat; one end of the pull rope is wrapped around the outside of the rotating shaft, and the other end of the pull rope is fixedly connected to the outer wall of the bottom end of the conveying pipe; an angle sensor is installed at the end of the rotating shaft, and the angle sensor is connected to the input end of the controller, and the output end of the controller is connected to the slurry pump and the second control valve.

[0010] Furthermore, a guide wheel for guiding the pull rope is installed on the shaft seat below the rotating shaft.

[0011] Furthermore, a one-way valve is installed at the bottom end of the delivery pipe.

[0012] Furthermore, a plurality of guide structures movably contacting with the inner wall of the outer sleeve are arranged on the lower outer wall of the delivery pipe.

[0013] Further, the guiding structure includes a fixed ring and rollers. The fixed ring is fixedly sleeved on the outer wall of the outer sleeve, and several rollers that roll and contact along the inner wall of the outer sleeve are rotatably arranged on the outer wall of the fixed ring. The several rollers are evenly arranged along the circumferential direction of the fixed ring.

[0014] The second object of the present invention is implemented by the following technical solution: A control method for a coal gangue grouting system. The controller adjusts the opening degrees of the first regulating valve and the second regulating valve according to the data received from the first concentration detector and the second concentration detector. The specific process is as follows:

[0015] (1) Set the standard concentration value at the outlet of the ball mill as C1 through the controller. The first concentration detector continuously detects the slurry concentration at the outlet of the ball mill and uploads the detected real-time concentration value C2 to the controller;

[0016] When C2 > C1, increase the opening degree of the first regulating valve until C2 = C1, and then maintain the opening degree of the first regulating valve;

[0017] When C2 < C1, decrease the opening degree of the first regulating valve until C2 = C1, and then maintain the opening degree of the first regulating valve;

[0018] (2) Set the standard concentration value at the outlet of the pulp making tank as C3 through the controller. The second concentration detector continuously detects the slurry concentration at the outlet of the pulp making tank and uploads the detected real-time concentration value C4 to the controller;

[0019] When C4 > C3, increase the opening degree of the second regulating valve until C2 = C1, and then maintain the opening degree of the second regulating valve;

[0020] When C4 < C3, decrease the opening degree of the second regulating valve until C2 = C1, and then maintain the opening degree of the second regulating valve.

[0021] Further, it also includes the following control process:

[0022] (3) Set the minimum flow value Q1 and the maximum flow value Q2 of the grouting pipe through the controller. The flow sensor continuously detects the flow of the grouting pipe and uploads the detected real-time flow value Q3 to the controller;

[0023] When Q3 < Q1, close the second control valve and open the third regulating valve until Q3 > Q2, then close the third regulating valve and open the second control valve.

[0024] Further, it also includes the following control process:

[0025] (4) The angle sensor is used to detect the rotation angle of the shaft in real time and transmit the detected data to the controller. When the controller receives the angle data transmitted by the angle sensor > 0, it controls the slurry pump to stop and close the second control valve.

[0026] The advantages of the present invention are as follows: by setting the first concentration meter and the second concentration meter to respectively detect the outlet slurry concentration of the ball mill and the slurry tank, it is convenient to adjust the opening of the first regulating valve and the second regulating valve; by setting a flow sensor at the grouting well, the blockage of the branch pipe can be detected. When the branch pipe is found to be blocked, the second control valve can be closed and the third regulating valve can be opened to introduce the water from the reservoir into the branch pipe for dredging, and the degree of automation is high. By setting the grouting inclined hole, the grouting well can be obliquely drilled according to the actual terrain, solving the problems of difficulty and high cost of vertical drilling, and an angle sensor is set at the grouting well. When the grouting inclined hole is broken, the angle information can be sent out in time, and then the corresponding second control valve and slurry pump can be cut off to stop grouting, avoid slurry overflow, and reduce losses. Description of the drawings:

[0027] Figure 1 It is a schematic diagram of the overall structure of this embodiment.

[0028] Figure 2 Schematic diagram of the grouting well structure.

[0029] Figure 3 for Figure 2 A partial enlarged view of .

[0030] Figure 4 Schematic diagram of the structure of the guide structure.

[0031] Figure 5 This is a diagram of the controller connection.

[0032] Ball mill 1, water reservoir 2, pulping tank 3, grouting well 4, delivery pipe 41, outer casing 42, grouting pipe 43, grouting inclined hole 44, inlet fixed well 45, outlet fixed well 46, control valve 47, flow sensor 48, shaft seat 49, rotating shaft 410, pull rope 411, torsion spring 412, angle sensor 413, guide wheel 414, one-way valve 415, guide structure 416, fixing ring 4161, roller 4162, three-way dispensing valve 5, first concentration meter 6, first pipeline 7, main pipeline 8, first control valve 9, second concentration meter 10, branch pipe 11, second control valve 12, slurry pump 13, first water pump 14, second water pump 15, first water pipe 16, first regulating valve 17, second water pipe 18, third water pipe 19, third regulating valve 20, controller 21, second regulating valve 22. Specific implementation method:

[0033] In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] Example 1: Figures 1 to 5 As shown, the gangue grouting system comprises a ball mill 1, a reservoir 2, a slurry tank 3 and a plurality of grouting wells 4. The outlet of the ball mill 1 is connected to the inlet of a three-way material distribution valve 5, and a first concentration meter 6 is installed at the outlet of the ball mill 1; the two outlets of the three-way material distribution valve 5 are respectively connected to the inlets of two slurry tanks 3, and the outlets of the two slurry tanks 3 are respectively connected to the inlet of a main pipeline 8 through a first pipeline 7, and a first control valve 9 and a second concentration meter 10 are sequentially installed on the first pipeline 7. The main pipeline 8 is connected to the inlet of the grouting pipe of each grouting well 4 through a branch pipe 11, and a second control valve 12 and a slurry pump 13 are sequentially arranged on the branch pipe 11; the outlet of the reservoir 2 is respectively connected to a first water pump 14, a second water pump 15 and a second water pump 16. The inlet of the pump 15 is connected, the outlet of the first water pump 14 is connected to the water inlet of the ball mill 1 through the first water pipe 16, and a first regulating valve 17 is arranged on the first water pipe 16; the outlet of the second water pump 15 is connected to the water inlet of each pulping tank 3 through the second water pipe 18, and a second regulating valve 22 is installed on the second water pipe 18; the outlet of the water reservoir 2 is connected to the branch pipe 11 on the outlet side of each second control valve 12 through the third water pipe 19, and a third regulating valve 20 is installed on the third water pipe 19; the first concentration meter 6 and the second concentration meter 10 are both connected to the input end of the controller 21, and the output end of the controller 21 is respectively connected to the first regulating valve 17 and the second regulating valve 22. The ball mill 1 is a wet ball mill. The slurry discharged from the ball mill 1 is distributed to the slurry tank 3 through the three-way distribution valve 5, and the two slurry tanks 3 are standby for each other; the second water pump 15 sends the water in the water reservoir 2 to the slurry tank 3 to adjust the slurry concentration to the process concentration, and then sends it to the main pipeline 8 through the corresponding first pipeline 7, and then distributed to each grouting well 4 through each branch pipe 11 for grouting.

[0035] The grouting well 4 includes a conveying pipe 41, an outer casing 42, a grouting pipe 43 and a grouting inclined hole 44 connected to the grouting space. The grouting inclined hole 44 includes a mounting hole 441 and an inclined hole 442 connected up and down. The outer casing 42 is fixed to the inner wall of the mounting hole 441, and the conveying pipe 41 is separately arranged inside the outer casing 42; an inlet fixed well 45 is arranged at the orifice position of the mounting hole 441, the top ends of the outer casing 42 and the grouting pipe 43 are buried inside the inlet fixed well 45, and the bottom outlet of the grouting pipe 43 is connected to the inlet of the inlet fixed well 45; an outlet fixed well 46 is fixed between the bottom inner wall of the outer casing 42 and the bottom outer wall of the conveying pipe 41, and the bottom end of the outlet fixed well 46 is connected to the orifice of the inclined hole 442; the grouting inclined hole 44 is inclinedly arranged and connected to the grouting space (the delamination space in the mining area) to realize grouting without vertical drilling, which can solve the influence of complex terrain or buildings on the ground on vertical drilling, and is more flexible and has strong applicability. A one-way valve 415 is installed at the bottom of the delivery pipe 41. Since the grouting is carried out under pressure in the later stage, the one-way valve 415 can prevent the slurry from returning upward. At the same time, if the delivery pipe 41 breaks, the slurry in the grouting space can be prevented from returning to the delivery pipe 41 and then leaking from the broken part. A control valve 47 is arranged on the grouting pipe 43, and the control valve 47 is used to control the opening and closing of the grouting pipe 43; a flow sensor 48 is arranged on the grouting pipe 43 below the control valve 47, and the flow sensor 48 is connected to the input end of the controller 21, and the output end of the controller 21 is connected to the second control valve 4712 and the third regulating valve 20. The flow rate in the grouting pipe 43 can be detected by the flow sensor 48, and the detected flow rate information is transmitted to the controller 21. When the detected flow rate is lower than the set flow rate, it indicates that the branch pipe 11 is blocked. At this time, the second control valve 12 is closed, the third regulating valve 20 is opened, and the water in the reservoir 2 is introduced into the branch pipe 11 through the third water pipe 19 for dredging, until the flow sensor 48 detects that the flow rate returns to the set value, and then the third regulating valve 20 is closed and the second control valve 12 is opened. A plurality of guide structures 416 that are in active contact with the inner wall of the outer sleeve 42 are provided on the lower outer wall of the delivery pipe 41, so as to facilitate the installation of the delivery pipe 41; specifically, the guide structure 416 includes a fixed ring 4161 and a roller 4162, the fixed ring 4161 is fixedly sleeved on the outer wall of the outer sleeve 42, and a plurality of rollers 4162 that are in rolling contact with the inner wall of the outer sleeve 42 are rotatably provided on the outer wall of the fixed ring 4161, and the plurality of rollers 4162 are evenly arranged along the circumferential direction of the fixed ring 4161. During the process of lowering the delivery tube 41 , the roller 4162 rolls along the inner wall of the outer sleeve 42 , which can prevent the delivery tube 41 from getting stuck in the outer sleeve 42 and enable the delivery tube 41 to be lowered smoothly.

[0036] It also includes a shaft seat 49, a rotating shaft 410 and a pull rope 411. The shaft seat 49 is fixed on the outer wall of the grouting pipe 43. The rotating shaft 410 arranged transversely is rotatably arranged on the shaft seat 49. A torsion spring 412 is arranged between the rotating shaft 410 and the shaft seat 49. One end of the pull rope 411 is wound around the outside of the rotating shaft 410, and the other end of the pull rope 411 is fixedly connected to the outer wall of the bottom end of the conveying pipe 41. A guide wheel 414 for guiding the pull rope 411 is installed on the shaft seat 49 below the rotating shaft 410. An angle sensor 413 is installed at the end of the rotating shaft 410. The angle sensor 413 is connected to the input end of the controller 21, and the output end of the controller 21 is connected to the slurry pump 13 and the second control valve 12. After the grouting well 4 is installed, it is possible to determine whether the delivery pipe 41 is broken by observing the displacement of the pull rope 411; when the delivery pipe 41 is broken, the pull rope 13 will drive the rotating shaft 410 to rotate. At this time, the angle sensor 413 will detect the angle signal and send it to the controller 21. At this time, the second control valve 12 is cut off, and the slurry pump 13 is shut down to stop grouting.

[0037] Embodiment 2: A control method for a coal gangue grouting system based on Embodiment 1, the specific process is as follows:

[0038] (1) The controller 21 is used to set the standard concentration value C1 at the outlet of the ball mill 1, and the first concentration detector detects the outlet slurry concentration of the ball mill 1 in real time, and uploads the detected real-time concentration value C2 to the controller 21;

[0039] When C2>C1, the opening of the first regulating valve 17 is increased until the opening of the first regulating valve 17 is maintained when C2=C1;

[0040] When C2<C1, the opening of the first regulating valve 17 is reduced until the opening of the first regulating valve 17 is maintained when C2=C1;

[0041] (2) The controller 21 is used to set the standard concentration value C3 at the outlet of the pulping tank 3, and the second concentration detector detects the outlet pulp concentration of the pulping tank 3 in real time, and uploads the detected real-time concentration value C4 to the controller 21;

[0042] When C4>C3, the opening of the second regulating valve 22 is increased until the opening of the second regulating valve 22 is maintained when C2=C1;

[0043] When C4<C3, the opening of the second regulating valve 22 is reduced until C2=C1, at which time the opening of the second regulating valve 22 is maintained.

[0044] (3) The minimum flow value Q1 and the maximum flow value Q2 of the grouting pipe 43 are set by the controller 21, and the flow sensor 48 detects the flow of the grouting pipe 43 in real time, and uploads the detected real-time flow value Q3 to the controller 21;

[0045] When Q3 < Q1, the second control valve 12 is closed and the third regulating valve 20 is opened until Q3 > Q2, then the third regulating valve 20 is closed and the second control valve 12 is opened.

[0046] (4) The angle sensor 413 is used to detect the rotation angle of the rotating shaft in real time and transmit the detected data to the controller 21. When the controller 21 receives the angle data transmitted by the angle sensor 413 and the angle data > 0, the slurry pump 13 is stopped and the second control valve 12 is closed.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Coal gangue grouting system, characterized in that: It includes a ball mill, a water reservoir, a slurry tank and several grouting wells. The outlet of the ball mill is connected to the inlet of the three-way material distribution valve, and a first concentration meter is installed at the outlet of the ball mill; the two outlets of the three-way material distribution valve are respectively connected to the inlets of the two pulping tanks, and the outlets of the two pulping tanks are respectively connected to the inlet of the main pipeline through a first pipeline, and a first control valve and a second concentration meter are sequentially installed on the first pipeline. The main pipeline is connected to the inlet of the grouting pipe of each grouting well through a branch pipe, and a second control valve and a slurry pump are sequentially arranged on the branch pipe; The outlet of the water reservoir is communicated with the inlet of the first water pump and the second water pump respectively; the outlet of the first water pump is communicated with the water inlet of the ball mill through a first water pipe, and a first regulating valve is arranged on the first water pipe; the outlet of the second water pump is communicated with the water inlet of each pulping tank through a second water pipe, and a second regulating valve is installed on the second water pipe; the outlet of the water reservoir is communicated with the branch pipe on the outlet side of each second control valve through a third water pipe, and a third regulating valve is installed on the third water pipe; the first concentration meter and the second concentration meter are both connected to the input end of the controller, and the output end of the controller is respectively connected to the first regulating valve and the second regulating valve.

2. The gangue grouting system according to claim 1, characterized in that: The grouting well includes a delivery pipe, an outer casing, a grouting pipe and a grouting inclined hole connected to the grouting space, the grouting inclined hole includes a mounting hole and an inclined hole connected up and down, the outer casing is fixed to the inner wall of the mounting hole, and the delivery pipe is separately arranged inside the outer casing; an inlet fixed well is arranged at the orifice position of the mounting hole, the top ends of the outer casing and the grouting pipe are buried in the inlet fixed well, and the bottom outlet of the grouting pipe is connected to the inlet of the inlet fixed well; an outlet fixed well is fixed between the bottom inner wall of the outer casing and the bottom outer wall of the delivery pipe, and the bottom end of the outlet fixed well is connected to the orifice of the inclined hole; a control valve is arranged on the grouting pipe, and a flow sensor is arranged on the grouting pipe below the control valve, the flow sensor is connected to the input end of the controller, and the output end of the controller is connected to the second control valve and the third regulating valve.

3. The coal gangue grouting system according to claim 2, characterized in that: It also includes an axle seat, a rotating shaft and a pull rope. The axle seat is fixed on the outer wall of the grouting pipe, and the horizontally arranged rotating shaft is rotatably arranged on the axle seat. A torsion spring is arranged between the rotating shaft and the axle seat; one end of the pull rope is wrapped around the outside of the rotating shaft, and the other end of the pull rope is fixedly connected to the outer wall of the bottom end of the conveying pipe; an angle sensor is installed at the end of the rotating shaft, and the angle sensor is connected to the input end of the controller, and the output end of the controller is connected to the slurry pump and the second control valve.

4. The gangue grouting system according to claim 3, characterized in that: A guide wheel for guiding the pull rope is installed on the shaft seat below the rotating shaft.

5. The gangue grouting system according to claim 2, characterized in that: A one-way valve is installed at the bottom end of the delivery pipe.

6. The gangue grouting system according to claim 2, characterized in that: A plurality of guide structures movably contacting with the inner wall of the outer sleeve are arranged on the lower outer wall of the conveying pipe.

7. The gangue grouting system according to claim 6, characterized in that: The guiding structure includes a fixed ring and rollers. The fixed ring is fixedly sleeved on the outer wall of the outer sleeve pipe, and several rollers that roll and contact along the inner wall of the outer sleeve pipe are rotatably arranged on the outer wall of the fixed ring. The several rollers are evenly arranged in the circumferential direction of the fixed ring.

8. A control method for a coal gangue grouting system, characterized in that: During the grouting process using the gangue grouting system described in claims 1-7, the controller adjusts the opening degrees of the first regulating valve and the second regulating valve according to the data received from the first concentration detector and the second concentration detector. The specific process is as follows: (1) Set the standard concentration value at the outlet of the ball mill as C1 through the controller. The first concentration detector continuously detects the slurry concentration at the outlet of the ball mill and uploads the detected real-time concentration value C2 to the controller. When C2 > C1, increase the opening degree of the first regulating valve until C2 = C1, and then maintain the opening degree of the first regulating valve. When C2 < C1, decrease the opening degree of the first regulating valve until C2 = C1, and then maintain the opening degree of the first regulating valve. (2) Set the standard concentration value at the outlet of the pulp making tank as C3 through the controller. The second concentration detector continuously detects the slurry concentration at the outlet of the pulp making tank and uploads the detected real-time concentration value C4 to the controller. When C4 > C3, increase the opening degree of the second regulating valve until C2 = C1, and then maintain the opening degree of the second regulating valve. When C4 < C3, decrease the opening degree of the second regulating valve until C2 = C1, and then maintain the opening degree of the second regulating valve.

9. A control method for a gangue grouting system according to claim 8, characterized in that: It further includes the following control process: (3) Set the minimum flow value Q1 and the maximum flow value Q2 of the grouting pipe through the controller. The flow sensor continuously detects the flow of the grouting pipe and uploads the detected real-time flow value Q3 to the controller. When Q3 < Q1, close the second control valve and open the third regulating valve. Until Q3 > Q2, then close the third regulating valve and open the second control valve.

10. The control method of a gangue grouting system according to claim 8, characterized in that: It further includes the following control process: (4) The angle sensor is used to continuously detect the rotation angle of the rotating shaft and transmit the detected data to the controller. When the controller receives the angle data transmitted by the angle sensor > 0, control the slurry pump to stop operating and close the second control valve.

Images