Coal mine underground movable grouting device and fire preventing and extinguishing method

Abstract

According to the coal mine underground movable grouting device and the fire preventing and extinguishing method, the device is convenient and fast in structure, underground operation is facilitated, construction in the limited underground operation environment can be met, the number of operators can be remarkably reduced, operation is convenient, and meanwhile the resource cost is saved; during use, the whole device is driven to move through the crawler belt mechanism, so that the whole device is convenient to move and is not easily influenced by terrains. In addition, slurry is preliminarily prepared by using a drum-type structure, and the prepared slurry can be stirred in the stirring barrel, so that the slurry is prevented from being condensed, and the overall operation efficiency is ensured. The underground movable grouting device for the coal mine is provided with a plurality of sensors, and the sensors can be matched with the controller to monitor the current working state; technicians in the field can conveniently monitor and control the screening, pulping and grouting processes, and the device is suitable for large-scale industrial use and popularization.

Description

Technical Field

[0001] The invention belongs to the field of grouting, and in particular relates to a mobile grouting device and a fire prevention and extinguishing method in an underground coal mine. Background Art

[0002] In the coal mining process, underground grouting is an important engineering and technical measure. Non-combustible solid materials are crushed into particles, mixed with water to form slurry, and then transported to the fire source in the mine through drilling holes or slurry pipelines under pressure. The slurry covers the remaining coal in the goaf, preventing the coal from oxidizing in contact with air or extinguishing the coal that has spontaneously combusted.

[0003] The grouting device in the prior art generally has a complicated overall structure, high cost and is inconvenient to move. Secondly, the slurry in the grouting device in the prior art is easy to coagulate when the grouting is suspended, which is not conducive to subsequent operations and affects the overall operation efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide a mobile grouting device and fire prevention and extinguishing method for underground coal mines to solve the above-mentioned technical problems in the prior art. The present invention adopts the following technical solutions to achieve the above-mentioned problems:

[0005] A mobile grouting device for underground coal mines, comprising a mobile device, wherein the mobile device comprises a crawler mechanism; a mounting platform is fixedly arranged on the crawler mechanism, and a grouting device is arranged on the mounting platform;

[0006] The pulping device comprises a support frame arranged at the front of the mounting platform, the upper part of the support frame is hinged to the front end of the first rotating shaft, and the first rotating shaft is arranged to be inclined downward and can rotate along a vertical plane;

[0007] A drum screen cover is installed on the first rotating shaft, and an openable and closable feed port is provided on the drum screen cover; a plurality of nozzles are evenly distributed along the axial direction on the upper part of the drum screen cover, and the lower part of the drum screen cover is an openable and closable structure;

[0008] A second rotating shaft extending in the axial direction is rotatably arranged in the middle of the drum screen cover, and a screening plate is also arranged inside the drum screen cover, and the screening plate is fixedly connected to the second rotating shaft; the rear end of the second rotating shaft is sealed and extends out of the drum screen cover, and the end can be connected to an external rotating motor; the second rotating shaft can drive the screening plate to rotate inside the drum screen cover by rotating around its own central axis under the drive of the external rotating motor;

[0009] A mixing barrel is arranged in the middle of the installation platform, and the lower part of the drum screen cover is connected to the mixing barrel through a discharge hopper; a vertical third rotating shaft is arranged vertically inside the mixing barrel; the third rotating shaft is connected to a rotating motor and a plurality of rotating blades are vertically distributed on the third rotating shaft;

[0010] The installation platform is also provided with a grouting pump and a clean water pump, and the mixing barrel is connected to the grouting pump pipeline;

[0011] The clean water pump is connected to a plurality of spray heads and a stirring barrel respectively.

[0012] The present invention also has the following features:

[0013] Furthermore, it also includes a feeding device; the feeding device includes a conveyor belt, the top end of the conveyor belt is overlapped on the top of the support frame, and the bottom end extends downward; the conveyor belt is provided with a groove structure capable of accommodating the slurry rock mass;

[0014] The feed port of the drum screen cover is opened at a position close to the top of the support frame, and a feed hopper is arranged at the feed port, and the inlet position of the feed hopper corresponds to the top of the conveyor belt.

[0015] Furthermore, a support plate is provided at the lower part of the support frame;

[0016] The conveyor belt is divided into a fixed section and a movable section, and the movable section is rotatably arranged on the support plate via a fourth rotating shaft.

[0017] Further, it also includes a waste collection device;

[0018] The waste collection device includes a waste collection bucket disposed at the rear of the mounting platform;

[0019] A discharge port is provided at the rear bottom of the drum screen cover, and the upper part of the waste collection bucket is connected to the discharge port of the drum screen cover through a discharge pipe;

[0020] A filter plate is arranged at the lower part of the waste collection barrel.

[0021] Further, it also includes an adjustment device;

[0022] The adjusting device comprises an adjusting bracket arranged on one side of the top of the waste collection bucket, the adjusting bracket is a telescopic structure, and the top of the adjusting bracket is hinged to the bottom of the first rotating shaft.

[0023] Furthermore, a transmission sleeve is coaxially sleeved on the lower part of the third rotating shaft of the mixing barrel;

[0024] Connecting rods are fixedly arranged on opposite sides of the transmission sleeve, and each of the connecting rods is connected to a scraper;

[0025] The scraper is L-shaped, and each scraper is in contact with the inner wall of the corresponding transmission sleeve;

[0026] A gear disc is coaxially arranged at the lower part of the third rotating shaft; the gear disc is located inside the transmission sleeve;

[0027] The toothed disc comprises a first toothed disc and a second toothed disc from top to bottom; the first toothed disc is rotatably connected to the third rotating shaft, and the first toothed disc is fixedly connected to the transmission sleeve via a sleeve sleeved on the third rotating shaft; the second toothed disc is fixedly connected to the third rotating shaft;

[0028] The outer rings on opposite sides of the first gear disc and the second gear disc are both provided with a circle of tooth structures with the same specifications along the circumferential direction;

[0029] The transmission sleeve inner wall has two opposite sides rotatably provided with transmission gear shafts that can rotate around their own central axis; the transmission gear shaft is located between the first gear plate and the second gear plate and can mesh with the tooth structures of the first gear plate and the second gear plate.

[0030] Furthermore, a plurality of auxiliary scrapers are evenly arranged on one side of the scraper close to the third rotating shaft.

[0031] Furthermore, the third rotating shaft is connected to the rotating motor via a belt drive.

[0032] Furthermore, it also includes a controller;

[0033] The mixing barrel is provided with a liquid level meter and a density meter;

[0034] The controller is connected with the rotating motor, the crawler mechanism, the liquid level meter, the density meter, the clean water pump and the grouting pump respectively.

[0035] A fire prevention and extinguishing method for a mobile grouting device in an underground coal mine, the method comprising the following steps:

[0036] Step 0, selecting the lower coal mining tunnel and carrying out enclosure protection for the lower coal mining tunnel before construction;

[0037] Step 1, moving the crawler mechanism to the underground area where the fire prevention and extinguishing operation is to be carried out;

[0038] Step 2, conveying the rock sample for pulping into the drum screen cover through the feeding device, and simultaneously using a clean water pump to supply water into the drum screen cover through the nozzle for pulping;

[0039] Step 3, when the slurry in the drum screen reaches the slurry standard for fire prevention and extinguishing operations, the prepared slurry is obtained, and the prepared slurry is injected into the mixing barrel;

[0040] Step 4, using a stirring bucket to continuously stir the prepared slurry, and simultaneously using a grouting pump to continuously transport the prepared slurry along a borehole pipeline connected to the lower coal mining tunnel to the upper fracture zone until the grouting completion standard is reached;

[0041] Whenever the prepared slurry in the mixing barrel is insufficient, steps 2-3 are repeated to add the prepared slurry into the mixing barrel;

[0042] Step 5, monitoring the CO, O2, CO2, CH4 and C2H4 conditions in the lower coal mining tunnel and its surrounding locations to determine the fire prevention and extinguishing effect;

[0043] If O2 and CO2 are consistent with the content in the air; CH4 and C2H4 are not detected; and the CO concentration is lower than 5ppm, the grouting is completed and the fire prevention and extinguishing effect is achieved;

[0044] Otherwise, repeat steps 2-4 until O2 and CO2 match the content in the air; CH4 and C2H4 are not detected; and the CO concentration is lower than 5ppm.

[0045] Compared with the prior art, the present invention has the following technical effects:

[0046] (I) The mobile grouting device for underground coal mines of the present invention has a convenient structure and is convenient for underground operations. It can meet the construction requirements of the limited underground working environment and can significantly reduce the number of operators, making it easy to operate while saving resource costs. When in use, the entire device is driven to move by a crawler mechanism, making the movement of the entire device more convenient and less susceptible to terrain. In addition, the slurry is initially prepared using a drum structure, and the prepared slurry can be stirred in a mixing barrel to prevent the slurry from condensing and ensure overall operating efficiency.

[0047] (II) The mobile underground grouting device for coal mines of the present invention is provided with a waste collection device. Since the drum screen cover is arranged at an angle, most of the prepared slurry enters the mixing barrel during its rotation; the slag and a small amount of slurry generated during the preparation process enter the waste collection device, thereby ensuring the quality of the prepared slurry.

[0048] (III) The mobile underground coal mine grouting device of the present invention is provided with a plurality of sensors, which can cooperate with the controller to monitor the current working status; it is convenient for technical personnel in this field to monitor and control the screening, slurry making and grouting processes, and is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the overall structure of the mobile grouting device for underground coal mines of the present invention;

[0050] Figure 2 It is a schematic diagram of the internal structure of the mixing barrel in the present invention;

[0051] Figure 3 It is an enlarged view of the mixing barrel A in the present invention.

[0052] The meaning of the symbols in the figure is:

[0053] 1. Crawler mechanism; 2. Mounting platform; 3. Support frame; 4. First rotating shaft; 5. Drum screen cover; 6. Second rotating shaft; 7. Screen plate; 8. Mixing barrel; 9. Discharge hopper; 10. Third rotating shaft; 11. Rotating motor; 12. Rotating blades; 13. Grouting pump; 14. Clean water pump; 15. Conveyor belt; 1501, Fixed section; 1502, Movable section; 16. Feed hopper; 17. Support plate; 18. Waste collection barrel; 19. Discharge pipe; 20. Filter plate; 21. Adjustment bracket; 22. Transmission sleeve; 23. Connecting rod; 24. Scraper; 2401, Auxiliary scraper; 25. Toothed disc; 26. Transmission gear shaft; 27. Controller; 28. Liquid level meter; 29. ​​Density meter. DETAILED DESCRIPTION

[0054] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art, such as a known and commonly used crawler mechanism.

[0055] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0056] like Figure 1 As shown, a mobile grouting device for underground coal mines is characterized in that it comprises a mobile device, the mobile device comprises a crawler mechanism 1; a mounting platform 2 is fixedly arranged on the crawler mechanism 1, and a grouting device is arranged on the mounting platform 2;

[0057] The pulping device comprises a support frame 3 arranged at the front of the mounting platform 2, a first rotating shaft 4 is rotatably arranged on the upper part of the support frame 3, the first rotating shaft 4 is arranged to be tilted downward and can rotate along a vertical plane;

[0058] The inclination angle of the first rotating shaft 4 is 5°-15°.

[0059] A drum screen cover 5 is installed on the first rotating shaft 4, and an openable and closable feed port is provided on the drum screen cover 5; a plurality of nozzles are evenly distributed along the axial direction on the upper part of the drum screen cover 5, and the lower part of the drum screen cover 5 is an openable and closable structure;

[0060] A second rotating shaft 6 extending in the axial direction is rotatably arranged in the middle of the drum screen cover 5, and a screening plate 7 is also arranged inside the drum screen cover 5, and the screening plate 7 is fixedly connected to the second rotating shaft 6; one end of the second rotating shaft 6 is sealed and extends out of the drum screen cover 5, and the end can be connected to an external rotating motor; the second rotating shaft 6 can drive the screening plate 7 to rotate inside the drum screen cover 5 by rotating around its own central axis;

[0061] A mixing barrel 8 is arranged in the middle of the installation platform 2, and the lower part of the drum screen cover 5 is connected to the mixing barrel 8 through a discharge hopper 9; a third rotating shaft 10 is vertically arranged inside the mixing barrel 8; the third rotating shaft 10 is connected to a rotating motor 11 and a plurality of rotating blades 12 are vertically distributed on the third rotating shaft 10;

[0062] The installation platform 2 is also provided with a grouting pump 13 and a clean water pump 14, and the mixing barrel 8 is connected to the grouting pump 13 through a pipeline;

[0063] The clean water pump 14 is connected to the plurality of spray heads and the mixing barrel 8 respectively.

[0064] The mobile grouting device for underground coal mines of the present invention has a convenient structure and is convenient for underground operations. It can meet the construction requirements of the limited underground working environment and can significantly reduce the number of operators, making it easy to operate while saving resource costs. When in use, the crawler mechanism 1 drives the entire device to move, making the entire device more convenient to move and less susceptible to terrain. In addition, the slurry is initially prepared using a drum structure, and the prepared slurry can be stirred in a mixing barrel 8 to prevent the slurry from condensing and ensure overall operating efficiency.

[0065] The use of this device is as follows:

[0066] First, the technicians in this field control the crawler mechanism 1 to move, driving the mobile grouting device in the coal mine to move to the place where the operation is to be carried out in the mine. Secondly, the rock sample material for grouting is transported into the drum screen cover 5; at the same time, the clean water pump 14 injects clean water into the drum screen cover 5 through the nozzle.

[0067] Next, the screen plate 7 is rotated to make slurry, and the slurry is allowed to enter the interior of the mixing barrel 8. When the amount of slurry in the mixing barrel 8 is sufficient, the grouting pump 13 is used to perform grouting operation on the belt operation part.

[0068] As a preferred solution, it also includes a feeding device; the feeding device includes a conveyor belt 15, the top of the conveyor belt 15 is overlapped on the top of the support frame 3, and the bottom of the conveyor belt 15 extends downward; the conveyor belt 15 is provided with a groove structure capable of accommodating the slurry rock mass;

[0069] The feed port of the drum screen cover 5 is opened at a position close to the top of the support frame 3 , and a feed hopper 16 is provided at the feed port. The inlet position of the feed hopper 16 corresponds to the top of the conveyor belt 15 .

[0070] This arrangement enables the rock sample for pulping to be more conveniently added into the drum screen cover 5, further enhancing the convenience of operation.

[0071] As a preferred solution, a support plate 17 is provided at the lower part of the support frame 3;

[0072] The conveyor belt 15 is divided into a fixed section 1501 and a movable section 1502 . The movable section 1502 is rotatably disposed on the support plate 17 via a fourth rotating shaft.

[0073] It should be noted that, according to conventional choices in this field, the conveyor belt 15 should be connected to a power device to facilitate the control of the conveying speed of the conveyor belt 15. The upper horizontal section of the fixed section 1501 can also be provided with a belt scale to weigh the material, so that technical personnel in this field can make adaptive adjustments according to actual conditions.

[0074] like Figure 2 As shown, the conveyor belt 15 is divided into two areas, wherein the fixed section 1501 occupies 2 / 3 of the entire conveyor belt 15, and the movable section 1502 occupies 1 / 3 of the entire conveyor belt 15; the fixed section 1501 conveys aeolian sand, and the movable section 1502 conveys cement.

[0075] As a preferred solution, Figure 3 As shown, it also includes a waste collection device;

[0076] The waste collection device includes a waste collection bucket 18 disposed at the rear of the mounting platform 2;

[0077] A discharge port is provided at the rear bottom of the drum screen cover 5, and the upper part of the waste collection bucket 18 is connected to the discharge port of the drum screen cover 5 through a discharge pipe 19;

[0078] A filter plate 20 is disposed at the lower inner portion of the waste collection barrel 18 .

[0079] In actual use, since the drum screen cover 4 is tilted, most of the prepared slurry enters the mixing barrel 8 during its rotation; the residue and a small amount of slurry produced during the preparation process enter the waste collection device, ensuring the quality of the prepared slurry.

[0080] When the slag and a small amount of slurry enter the waste collection barrel 18, the slag is blocked by the filter plate 20 in the middle of the waste collection barrel 18, while the slurry enters the bottom of the waste collection barrel 18, achieving separation for subsequent further cleaning.

[0081] As a preferred solution, it also includes an adjustment device;

[0082] The adjustment device includes an adjustment bracket 21 arranged on one side of the top of the waste collection bucket 18. The adjustment bracket 21 is a retractable structure, and the top of the adjustment bracket 21 is connected to the bottom of the first rotating shaft 4. This arrangement can adjust the inclination angle of the drum screen cover 4, and those skilled in the art can adjust it according to actual needs, further enhancing the applicability of the device.

[0083] As an optional solution, the bracket 21 can be adjusted using a hydraulic rod, and the principle of adjusting the angle of the hydraulic rod is a prior art.

[0084] As a preferred solution, a transmission sleeve 22 is coaxially sleeved on the lower part of the third rotating shaft 10 of the mixing barrel 8;

[0085] Connecting rods 23 are provided on both sides of the transmission sleeve 22, and each connecting rod 23 is connected to a scraper 24;

[0086] The scraper 24 is L-shaped, and each scraper 24 contacts the inner wall of the corresponding transmission sleeve 22;

[0087] A toothed disc 25 is coaxially arranged at the lower part of the third rotating shaft 10; the toothed disc 25 is located inside the transmission sleeve 22;

[0088] The toothed disc includes a first toothed disc and a second toothed disc from top to bottom; the first toothed disc is rotatably connected to the third rotating shaft 10, and the first toothed disc is fixedly connected to the transmission sleeve 22 through a fixing member; the second toothed disc is fixedly connected to the third rotating shaft 10;

[0089] The outer rings on opposite sides of the first gear disc and the second gear disc are both provided with a circle of tooth structures with the same specifications along the circumferential direction;

[0090] Transmission gear shafts 26 rotatable around their own central axes are rotatably provided on opposite sides of the inner wall of the transmission sleeve 22 ; the transmission gear shafts 26 are located between the first gear disc and the second gear disc and can mesh with the tooth structures of the first gear disc and the second gear disc.

[0091] This arrangement can make the slurry inside the mixing barrel 8 more uniform during the stirring process, prevent the slurry particles from settling at the bottom, and because the slurry will eventually be sucked out by the grouting pump 13, the scraper 24 can scrape the slurry more easily.

[0092] In addition, during use, since the first gear disc is rotationally connected to the third rotating shaft 10 and the first gear disc is fixedly connected to the transmission sleeve 22 through a fixing member; the second gear disc is fixedly connected to the third rotating shaft 10. When the third rotating shaft 10 rotates, the second gear disc and the third rotating shaft 10 rotate in the same direction, and the first gear disc and the third rotating shaft 10 rotate in opposite directions, thereby driving the rotation direction of the two scrapers 24 to be opposite to the rotation direction of the third rotating shaft 10. As a result, the slurry in the mixing barrel 8 is mixed more evenly under the rotation of two different directions, and since the scraper 24 rotates counterclockwise, the slurry deposited at the bottom of the mixing barrel 8 is stirred by the rotation of the scraper 24, so that the utilization rate of the slurry is higher.

[0093] Further preferably, a plurality of auxiliary scrapers 2401 are evenly arranged on one side of the scraper 24 close to the third rotating shaft 10, so as to further improve the stirring efficiency.

[0094] More preferably, in order to enable the scraper 24 to drive a larger area of ​​slurry to rotate when it rotates counterclockwise, the present application has multiple auxiliary scrapers 2401 welded on the inner side of the scraper 24. When the scraper 24 rotates, the auxiliary scraper 2401 also rotates accordingly, driving the slurry that cannot be stirred by the rotating blade 12 to rotate. When the rotating blade 12 rotates clockwise and the scraper 24 rotates counterclockwise, the slurry in the mixing barrel 8 can not only be fully stirred, but also the convection generated by the rotation of the rotating blade 12 and the scraper 24 in different directions can make the slurry stirred more evenly, thereby avoiding the deposition of the slurry in the mixing barrel 8.

[0095] Specifically, the third rotating shaft 10 is connected to the rotating motor 11 by belt transmission.

[0096] As a preferred solution, a controller 27 is also included; the controller 27 is conventionally selected and uses a known controller to perform control through an existing algorithm.

[0097] The mixing barrel 8 is provided with a liquid level meter 28 and a density meter 29;

[0098] The controller 27 is respectively connected to the rotating motor 11, the crawler mechanism 1, the liquid level meter 28, the density meter 29, the clean water pump 14 and the grouting pump 13. On the basis of the original device, the controller 27 is added, and those skilled in the art can centrally control the above components through the controller, which further increases the convenience of the device.

[0099] For example, the liquid level meter 28 is used to detect the amount of slurry in the mixing barrel 8, so that those skilled in the art can intuitively obtain the slurry content information in the mixing barrel 8, facilitate timely addition of slurry, and ensure sufficient slurry supply.

[0100] The densitometer 29 is used to detect the density of the slurry in the mixing barrel 8 to determine whether the slurry meets the requirements, so as to facilitate the technicians in this field to make adaptive adjustments.

[0101] The rotation speed of the drum screen cover 8 is controlled by the rotating motor 11, and the internal screen can be replaced according to the material particle size and pulping requirements; the nozzle on the upper part of the drum screen cover 8 is used to flush the solid particle raw material in the drum screen cover 8 and provide pulping water, which is provided by the clean water pump 14;

[0102] According to conventional selection in the field, the clean water pump 14 should be equipped with a sluice that can control the amount of water supplied. The amount of water supplied is controlled by the sluice of the clean water pump 14, and a clean water flow meter can also be added for monitoring.

[0103] The slurry that meets the pulping requirements flows out from the discharge hopper 9 to the mixing barrel 8 , and the remaining slag and the grass roots, branches, sundries, stones and other debris mixed in the slag are discharged into the waste collection barrel 18 .

[0104] The above processes can all display the working status of each component in the system and the instrument monitoring data through the controller 27, monitor and control the screening, pulping and grouting processes, and record all the data.

[0105] A fire prevention and extinguishing method for a mobile grouting device in an underground coal mine, the method is based on the above-mentioned mobile grouting device in an underground coal mine, and comprises the following steps:

[0106] Step 0, selecting a lower coal mining tunnel and performing enclosure protection on the lower coal mining tunnel before construction; technical personnel in this field set a grouting completion standard according to the actual situation of the underground area where the fire prevention and extinguishing operation is to be performed;

[0107] Step 1: A person skilled in the art controls the crawler mechanism 1 to move to an underground area where a fire prevention and extinguishing operation is to be performed;

[0108] Step 2, the technicians in this field transport the rock sample for pulping into the drum screen cover 5 through the feeding device, and simultaneously use the clean water pump 14 to supply water into the drum screen cover 5 through the nozzle to perform pulping operation;

[0109] Among them, rock samples for slurry preparation include cement and aeolian sand;

[0110] Step 3, when the slurry in the drum screen cover 5 reaches the slurry standard for fire prevention and extinguishing operations, the prepared slurry is obtained, and the prepared slurry in the drum screen cover 5 is injected into the mixing barrel 8;

[0111] Among them, the slurry standard for fire prevention and extinguishing operations is: the mass ratio of cement: aeolian sand: water = 1:3:6;

[0112] Step 4, using a stirring barrel 8 to continuously stir the prepared slurry, and simultaneously using a grouting pump 14 to continuously transport the prepared slurry along a borehole pipeline connected to the lower coal mining tunnel to the upper fracture zone until the grouting completion standard is reached to achieve oxygen blocking in the air;

[0113] Whenever the prepared slurry in the stirring barrel (8) is insufficient, steps 1 to 3 are repeated to replenish the prepared slurry in the stirring barrel (8);

[0114] Step 5, monitoring the CO, O2, CO2, CH4 and C2H4 conditions in the lower coal mining tunnel and its surrounding locations to determine the fire prevention and extinguishing effect;

[0115] If O2 and CO2 are consistent with the content in the air; CH4 and C2H4 are not detected; and the CO concentration is lower than 5ppm, the grouting is completed and the fire prevention and extinguishing effect is achieved;

[0116] Otherwise, repeat steps 2-4 until O2 and CO2 match the content in the air; CH4 and C2H4 are not detected; and the CO concentration is lower than 5ppm.

[0117] The mobile grouting device and fire prevention and extinguishing method for underground coal mines of the present invention have been used in production operations. A specific embodiment is given below:

[0118] A certain mine has a shallow and thick coal seam with multiple groups of coal available for mining. After comprehensive mining of the upper coal in the shallow coal seam, the goaf collapsed, causing large cracks on the ground. After comprehensive mining of the lower coal seam, the ground cracks were further aggravated. If the cracks are not sealed in time, the residual coal in the goaf will spontaneously combust, further causing the lower coal to spontaneously combust, and ultimately making it impossible to mine the lower coal resources, resulting in a serious waste of non-renewable energy.

[0119] When performing fire prevention and extinguishing operations, the mobile underground coal mine grouting device and fire prevention and extinguishing method of the present invention are used. First, a tunnel adjacent to the lower coal mining tunnel is selected, that is, the lower coal mining tunnel is selected, and the lower coal mining tunnel is enclosed before construction.

[0120] Secondly, the mobile underground coal mine grouting device of the present invention is moved to the waiting operation position of the lower coal mining tunnel, and the underground coal mine fire grouting device is used to prepare the fire extinguishing material slurry according to the required properties of the fire extinguishing material.

[0121] Next, after the fire-proof extinguishing material slurry is prepared, the fire-proof extinguishing material slurry is transported to the upper fracture zone along the drilled pipe connected to the lower coal mining tunnel using the fire-proof extinguishing method of the present invention using the mobile grouting device in underground coal mines to block oxygen in the air.

[0122] It should be noted that the dimensions of the lower coal mining tunnel are 6m wide and 4m high; while the total height of the mobile grouting device for underground coal mines of the present invention does not exceed 2.5m, and the width does not exceed 2m. It has a reasonable structure and compact size, which saves space for drilling equipment, temporary storage of materials, etc. At the same time, the whole process is automated for loading and monitoring, which liberates underground human resources and is safer and more efficient.

[0123] After the grouting is completed, gas composition and content monitoring points are set up in the tunnel and the lower goaf. The lower goaf is the lower coal mining tunnel 41 and its surrounding areas. The CO, O2, CO2, CH4, and C2H4 conditions are monitored to determine the fire prevention and extinguishing effects.

[0124] In this embodiment, CO2 is consistent with the content in the air; CH4 and C2H4 are not detected, and the oxygen concentration in the tunnel before and after grouting meets the standard.

[0125] The concentration of CO is as follows: before grouting, the CO concentration in the lower goaf of the mine was as high as 54ppm. At the same time, CO was also detected in the goaf-side tunnel, with a concentration of up to 36ppm, indicating that the upper crack zone, upper collapse zone, lower crack zone and lower collapse zone have been connected. If no measures are taken, the coal left in the goaf will continue to oxidize, generating high-temperature points, causing fires in the lower goaf and even lower coal fires, causing huge losses. After grouting the upper crack zone, the CO concentration in the lower goaf dropped to 4ppm, and the CO concentration in the lower tunnel dropped to 0ppm, with obvious grouting effects.

Claims

1. A mobile grouting device for underground coal mines, characterized in that: The mobile device comprises a crawler mechanism (1); a mounting platform (2) is fixedly arranged on the crawler mechanism (1); and a pulping device is arranged on the mounting platform (2); The pulping device comprises a support frame (3) arranged at the front of the mounting platform (2), the upper part of the support frame (3) is hinged to the front end of a first rotating shaft (4), and the first rotating shaft (4) is arranged to be tilted downward and can rotate along a vertical plane; A drum screen cover (5) is installed on the first rotating shaft (4), and an openable and closable feed port is provided on the drum screen cover (5); a plurality of nozzles are evenly distributed along the axial direction on the upper part of the drum screen cover (5), and the lower part of the drum screen cover (5) is an openable and closable structure; A second rotating shaft (6) extending in the axial direction is rotatably arranged in the middle of the drum screen cover (5), and a screening plate (7) is also arranged inside the drum screen cover (5), and the screening plate (7) is fixedly connected to the second rotating shaft (6); the rear end of the second rotating shaft (6) is sealed and extends outside the drum screen cover (5), and the end can be connected to an external rotating motor; the second rotating shaft (6) can drive the screening plate (7) to rotate inside the drum screen cover (5) by rotating around its own central axis under the drive of the external rotating motor; A stirring barrel (8) is arranged in the middle of the installation platform (2), and the lower part of the drum screen cover (5) is connected to the stirring barrel (8) through a discharge hopper (9); a vertical third rotating shaft (10) is arranged vertically inside the stirring barrel (8); the third rotating shaft (10) is connected to a rotating motor (11), and a plurality of rotating blades (12) are vertically distributed on the third rotating shaft (10); The installation platform (2) is also provided with a grouting pump (13) and a clean water pump (14), and the mixing barrel (8) is connected to the grouting pump (13) via a pipeline; The clean water pump (14) is connected to a plurality of spray heads and a mixing barrel (8) respectively.

2. The mobile grouting device for underground coal mines according to claim 1, characterized in that: It also includes a feeding device; the feeding device includes a conveyor belt (15), the top end of the conveyor belt (15) is overlapped on the top of the support frame (3), and the bottom end extends downward; the conveyor belt (15) is provided with a groove structure capable of accommodating the slurry rock mass; The feed port of the drum screen cover (5) is opened at a position close to the top of the support frame (3), and a feed hopper (16) is arranged at the feed port. The inlet position of the feed hopper (16) corresponds to the top of the conveyor belt (15).

3. The mobile grouting device for underground coal mines according to claim 2, characterized in that: A support plate (17) is provided at the lower part of the support frame (3); The conveyor belt (15) is divided into a fixed section (1501) and a movable section (1502), and the movable section (1502) is rotatably arranged on the support plate (17) via a fourth rotating shaft.

4. The mobile grouting device for underground coal mines according to claim 3, characterized in that: Also included is a waste collection device; The waste collection device comprises a waste collection bucket (18) arranged at the rear of the installation platform (2); The bottom rear end of the drum screen cover (5) is provided with a discharge port, and the upper part of the waste collection bucket (18) is connected to the discharge port of the drum screen cover (5) through a discharge pipe (19); A filter plate (20) is arranged at the lower inner part of the waste collection barrel (18).

5. The mobile grouting device for underground coal mines according to claim 4, characterized in that: Also includes an adjustment device; The adjusting device comprises an adjusting bracket (21) arranged on one side of the top of the waste collection bucket (18); the adjusting bracket (21) is a retractable structure; the top of the adjusting bracket (21) is hinged to the bottom of the first rotating shaft (4).

6. The mobile grouting device for underground coal mines according to claim 4, characterized in that: A transmission sleeve (22) is coaxially sleeved on the lower part of the third rotating shaft (10) of the mixing barrel (8); Connecting rods (23) are fixedly arranged on opposite sides of the transmission sleeve (22), and each of the connecting rods (23) is connected to a scraper (24); The scraper (24) is L-shaped, and each scraper (24) is in contact with the inner wall of the corresponding transmission sleeve (22); A toothed disc (25) is coaxially arranged at the lower part of the third rotating shaft (10); the toothed disc (25) is located inside the transmission sleeve (22); The toothed disc (25) comprises a first toothed disc and a second toothed disc from top to bottom; the first toothed disc is rotationally connected to the third rotating shaft (10), and the first toothed disc is fixedly connected to the transmission sleeve (22) via a sleeve sleeved on the third rotating shaft (10); the second toothed disc is fixedly connected to the third rotating shaft (10); The outer rings on opposite sides of the first gear disc and the second gear disc are both provided with a circle of tooth structures with the same specifications along the circumferential direction; The transmission sleeve (22) has a transmission gear shaft (26) rotatably arranged on both sides of the inner wall thereof and capable of rotating around its own central axis; the transmission gear shaft (26) is located between the first gear disc and the second gear disc and can mesh with the tooth structures of the first gear disc and the second gear disc.

7. The mobile grouting device for underground coal mines according to claim 6, characterized in that: A plurality of auxiliary scrapers (2401) are evenly arranged on one side of the scraper (24) close to the third rotating shaft (10).

8. The mobile grouting device for underground coal mines according to claim 7, characterized in that: The third rotating shaft (10) is connected to the rotating motor (11) by means of belt transmission.

9. The mobile grouting device for underground coal mines according to any one of claims 1 to 8, characterized in that: Also includes a controller (27); The stirring barrel (8) is provided with a liquid level meter (28) and a density meter (29); The controller (27) is connected to the rotating motor (11), the crawler mechanism (1), the liquid level meter (28), the density meter (29), the clean water pump (14) and the grouting pump (13) respectively.

10. A fire prevention and extinguishing method for a mobile grouting device in an underground coal mine, the method being based on the mobile grouting device in an underground coal mine according to claim 9, characterized in that: The following steps are involved: Step 0, selecting the lower coal mining tunnel and carrying out enclosure protection for the lower coal mining tunnel before construction; Step 1, moving the crawler mechanism (1) to an underground area where fire prevention and extinguishing operations are to be performed; Step 2, conveying the rock sample for pulping into the drum screen cover (5) through the feeding device, and simultaneously using the clean water pump (14) to supply water into the drum screen cover (5) through the nozzle for pulping; Step 3, when the slurry in the drum screen cover (5) reaches the slurry standard for fire prevention and extinguishing operations, the prepared slurry is obtained, and the prepared slurry is injected into the mixing barrel (8); Step 4, using a stirring barrel (8) to continuously stir the prepared slurry, and simultaneously using a grouting pump (14) to continuously transport the prepared slurry along a borehole pipeline connected to the lower coal mining tunnel to the upper fracture zone until the grouting completion standard is reached; Whenever the prepared slurry in the stirring barrel (8) is insufficient, steps 2-3 are repeated to replenish the prepared slurry in the stirring barrel (8); Step 5, monitoring the CO, O2, CO2, CH4 and C2H4 conditions in the lower coal mining tunnel and its surrounding locations to determine the fire prevention and extinguishing effect; If O2 and CO2 are consistent with the content in the air; CH4 and C2H4 are not detected; and the CO concentration is lower than 5ppm, the grouting is completed and the fire prevention and extinguishing effect is achieved; Otherwise, repeat steps 2-4 until O2 and CO2 match the content in the air; CH4 and C2H4 are not detected; CO concentration is less than 5ppm.

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