A grouting device for preventing and controlling spontaneous combustion of residual coal in goaf of coal mine

Abstract

The present invention relates to the technical field of coal mine fire prevention, and specifically discloses a grouting device for preventing spontaneous combustion of residual coal in a goaf of a coal mine, comprising: a mobile frame; a material tank, which is arranged on the mobile frame; a middle storage bin, which is communicated with the bottom outlet of the material tank; a composite pipe, which comprises a slurry conveying pipe and an exhaust pipe; and a head, which comprises an exhaust hood and a grouting head coaxially distributed. During the process of grouting for fire prevention in the present invention, the gas in the goaf is discharged into the middle storage bin through the exhaust pipe, which can prevent the generation of negative pressure in the middle storage bin. The stability of the air pressure can reduce the pressure fluctuation during the slurry pumping process, making the slurry pumping smoother and ensuring that the slurry can be continuously and smoothly pumped out. At the same time, the middle storage bin is used to store the flammable gases such as methane or other toxic gases discharged from the goaf, avoiding direct emission into the atmosphere, reducing environmental pollution and safety risks, and also facilitating the subsequent collection of the goaf gas.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine fire prevention, and more specifically, to a grouting device for preventing and controlling spontaneous combustion of coal residue in a goaf area of ​​a coal mine. Background Art

[0002] Coal mine goaf refers to the empty space or cavity left after underground coal mining. If the cracks above the goaf are not sealed in time, it will cause a lot of air leakage in the goaf, providing sufficient oxygen for the oxidation of the coal. The coal will continue to accumulate heat in the pile state, and through complex oxidation reactions, it will eventually cause the coal in the goaf to spontaneously combust.

[0003] By pouring slurry into the goaf to cover the remaining coal and prevent oxygen from coming into contact with the coal, the spontaneous combustion of the coal can be prevented. The moisture in the slurry absorbs and consumes the heat generated during the oxidation process of the coal, plays a cooling role, destroys the formation of combustion conditions, and can effectively prevent the spontaneous combustion of the coal left in the goaf;

[0004] In the traditional grouting fire prevention process, toxic and harmful gases inside the goaf are directly discharged into the atmosphere, causing environmental pollution and safety risks. In addition, the gas emission process can easily lead to unstable air pressure inside the goaf, which in turn affects the pressure fluctuations of the slurry during the pumping process, causing pumping problems and affecting the efficiency of the grouting operation. Summary of the invention

[0005] In order to overcome the above technical problems, the present invention proposes a grouting device for preventing and controlling spontaneous combustion of coal residue in goaf areas of coal mines.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf, comprising:

[0008] Mobile racks;

[0009] A material tank is arranged on a mobile rack, and a material channel valve is installed at the bottom outlet of the material tank;

[0010] The middle bin is arranged on the mobile frame and is connected with the bottom outlet of the material tank. An air valve is installed on the top of the middle bin, and a grouting pump is arranged at the outlet of the middle bin;

[0011] The composite pipe comprises a slurry delivery pipe and an exhaust pipe, wherein one end of the slurry delivery pipe is connected to the outlet of the middle bin, one end of the exhaust pipe is communicated with the inside of the middle bin, and the other end of the exhaust pipe penetrates the slurry delivery pipe and is buried in the slurry delivery pipe;

[0012] The end head comprises an exhaust hood and a grouting head which are coaxially distributed. The grouting head is connected to one end of the grouting pipe away from the central bin, and one end of the exhaust pipe away from the central bin is communicated with the inside of the exhaust hood.

[0013] As a further solution of the present invention: a batching member is provided at the outlet of the middle bin. The batching member includes a batching housing connected to the grouting pump. The batching housing is detachably connected to the slurry delivery pipe through a connector. A first flow channel communicating with the connector is opened in the batching housing, and a number of first communication holes are provided between the first flow channel and the grouting pump.

[0014] As a further solution of the present invention: a batching sleeve is rotatably embedded in the batching housing, and a switching motor for driving the batching sleeve is installed on the moving frame; a second flow channel communicating with the first flow channel is opened in the batching sleeve, and a number of second communication holes adapted to the first communication holes are opened on the side wall of the second flow channel.

[0015] As a further solution of the present invention: an annular flexible film is connected between the exhaust hood and the grouting head. A number of tension bands connected to the side wall of the exhaust hood are circumferentially distributed on the annular flexible film, and an extrusion member adapted to the annular flexible film is provided in the exhaust hood.

[0016] As a further solution of the present invention: the extrusion member includes a rotating ring rotatably provided in the exhaust hood. A number of fan blades are circumferentially provided on the rotating ring, and a vibrating block abutting against the annular flexible film is further provided on one side of the rotating ring.

[0017] As a further solution of the present invention: a number of groups of filter meshes are circumferentially provided on the outer side of the exhaust hood, and a group of elastic flap pieces adapted to the vibrating block are connected to each group of filter meshes.

[0018] As a further solution of the present invention: a driving motor is installed on the top of the material tank. The output end of the driving motor is connected to a driving shaft vertically extending into the material tank, and stirring blades are provided at the lower end of the driving shaft; a liftable material disturbing plate is provided in the material tank, and a reciprocating lifting member for driving the material disturbing plate is provided in the material tank.

[0019] As a further solution of the present invention: a number of notches are circumferentially opened on the material disturbing plate, a cover plate is movably provided above the notches, a middle partition cylinder for accommodating the driving shaft is provided at the center of the material disturbing plate, and an inverted conical elastic sealing sleeve is connected to the bottom of the middle partition cylinder.

[0020] As a further solution of the present invention: the reciprocating lifting member includes a sliding sleeve circumferentially fixed on the inner wall of the material tank. A lifting rack is vertically slidably sleeved in the sliding sleeve. The lower end of the lifting rack is fixedly connected to the material disturbing plate, and the upper end of the lifting rack is connected to a sliding rod movably penetrating through the material tank. A spring is sleeved on the sliding rod;

[0021] A transmission shaft is also horizontally and rotatably installed on the inner wall of the material tank. An incomplete gear meshing with the lifting rack is installed on the transmission shaft. A transmission bevel gear is installed at one end of the transmission shaft facing the drive shaft. A drive bevel gear meshing with the transmission bevel gear is arranged on the drive shaft.

[0022] As a further solution of the present invention: the material tank includes an inner tank, a jacket and a shell nested in sequence from inside to outside. A heater adapted to the inner tank is installed at the bottom of the material tank.

[0023] The beneficial effects of the present invention:

[0024] During the grouting fire prevention process of the present invention, the gas in the goaf is discharged into the central bin through the exhaust pipe, which can prevent the generation of negative pressure in the central bin. The stability of the air pressure can reduce the pressure fluctuation during the slurry pumping process, making the slurry pumping smoother, ensuring that the slurry can be continuously and smoothly pumped out, and improving the efficiency of the grouting operation; at the same time, the central bin is used to store the flammable gases such as methane or other toxic gases discharged from the goaf, avoiding direct emission into the atmosphere, reducing environmental pollution and safety risks, and also facilitating the subsequent collection of the goaf gas. By monitoring the gas components, the environmental conditions of the goaf can be evaluated, providing data support for subsequent environmental governance and safety measures. For the components that can be utilized in the goaf gas, resource recovery and utilization can be carried out to reduce energy waste. Description of the Drawings

[0025] The present invention will be further described below with reference to the drawings.

[0026] Figure 1 is a three-dimensional schematic diagram of the present invention;

[0027] Figure 2 is a three-dimensional schematic diagram of another perspective of the present invention;

[0028] Figure 3 is a structural schematic diagram of the material tank, the central bin and the composite pipe in the present invention;

[0029] Figure 4 is a structural schematic diagram of another perspective of the material tank, the central bin and the composite pipe in the present invention;

[0030] Figure 5 is a cross-sectional view of the composite pipe and the central bin in the present invention;

[0031] Figure 6 is a structural schematic diagram of the batching housing in the present invention;

[0032] Figure 7 is a structural schematic diagram of the batching part in the present invention;

[0033] Figure 8 is a structural schematic diagram of the end in the present invention;

[0034] Figure 9 Structural schematic diagram of another perspective of the end in the present invention;

[0035] Figure 10 Cross-sectional view of the end in the present invention;

[0036] Figure 11 is Figure 10 Enlarged view of part A in

[0037] Figure 12 Cross-sectional view of another perspective of the end in the present invention;

[0038] Figure 13 is Figure 12 Enlarged view of part B in

[0039] Figure 14 Cross-sectional view of the material tank in the present invention;

[0040] Figure 15 Structural schematic diagram of the material disturbing plate in the present invention;

[0041] Figure 16 Side view of the material disturbing plate in the present invention;

[0042] Figure 17 is Figure 14 Enlarged view of part C in

[0043] In the figure:

[0044] 100, moving frame;

[0045] 200, material tank; 201, inner tank; 202, jacket; 203, outer shell; 210, material channel valve; 220, drive motor; 230, drive shaft; 231, stirring blade; 232, drive bevel gear; 240, material disturbing plate; 241, notch; 242, cover plate; 243, middle partition cylinder; 244, inverted conical elastic seal sleeve; 251, sliding sleeve; 252, lifting rack; 253, sliding rod; 254, spring; 255, transmission shaft; 256, incomplete gear; 257, transmission bevel gear; 260, heater;

[0046] 300, middle storage bin; 310, air valve; 320, batching part; 321, batching housing; 3211, first flow channel; 3212, first communication hole; 322, batching sleeve; 3221, second flow channel; 3222, second communication hole; 323, connector; 324, switching motor; 330, grouting pump;

[0047] 400, composite pipe; 410, slurry delivery pipe; 420, exhaust pipe;

[0048] 500, end; 510, exhaust hood; 511, filter screen; 520, grouting head; 530, annular flexible capsule piece; 540, tension band; 550, swivel; 560, fan blade; 570, vibrating block; 580, elastic flap. Detailed implementation manners

[0049] Now, the subject matter described herein will be discussed with reference to exemplary embodiments. It should be understood that discussing these embodiments is only to enable those skilled in the art to better understand and thus implement the subject matter described herein. Without departing from the scope of protection of the content of this specification, changes can be made to the functions and arrangements of the elements discussed. Each example can omit, substitute, or add various processes or components as needed. Additionally, the features described relative to some examples can also be combined in other examples.

[0050] Please refer to Figure 1 and Figure 2 , the present invention discloses a grouting device for preventing and controlling spontaneous combustion of residual coal in goafs of coal mines, including a mobile frame 100, a material tank 200, a central bin 300, a composite pipe 400, and an end 500;

[0051] Please refer to Figure 3 and Figure 4 , the material tank 200 is arranged on the mobile frame 100, and a material channel valve 210 is installed at the bottom outlet of the material tank 200;

[0052] Please refer to Figure 5 , the central bin 300 is arranged on the mobile frame 100 and is communicated with the bottom outlet of the material tank 200. An air valve 310 is installed at the top of the central bin 300, and a grouting pump 330 is arranged at the outlet of the central bin 300; The composite pipe 400 includes a slurry delivery pipe 410 and an exhaust pipe 420. One end of the slurry delivery pipe 410 is connected to the outlet of the central bin 300, one end of the exhaust pipe 420 is communicated with the inside of the central bin 300, and the other end of the exhaust pipe 420 penetrates through the slurry delivery pipe 410 and is buried in the slurry delivery pipe 410;

[0053] Please refer to Figure 8 and Figure 9 , the end 500 includes an exhaust hood 510 and a grouting head 520 distributed coaxially. The grouting head 520 is connected to the end of the slurry delivery pipe 410 away from the central bin 300, and the end of the exhaust pipe 420 away from the central bin 300 is communicated with the inside of the exhaust hood 510;

[0054] Specifically, before grouting, open the material channel valve 210 and the air valve 310 to open the channel between the material tank 200 and the middle bin 300. Inject the slurry in the material tank 200 into the middle bin 300. At the same time, the air in the middle bin 300 is discharged from the air valve 310 until the middle bin 300 is filled with the slurry. Then close the material channel valve 210 and the air valve 310 to make the inside of the middle bin 300 in a closed state. Insert the end 500 of the slurry delivery pipe 410 into the goaf in the coal mine through a pre-drilled hole, and seal the gap between the end 500 and the hole. Open the grouting pump 330 to pump the slurry in the middle bin 300 into the end 500 through the slurry delivery pipe 410. Subsequently, the slurry is injected into the goaf through the grouting head 520. During the grouting process, as the slurry gradually fills the internal space of the goaf, the air pressure in the goaf increases, which prompts the gas in the goaf to enter the exhaust pipe 420 through the exhaust hood 510, and then enters the middle bin 300 along the exhaust pipe 420, thereby compensating for the negative pressure generated in the middle bin 300 due to the pumping out of the slurry, maintaining the air pressure stability in the middle bin 300, ensuring that the slurry can be continuously and smoothly pumped out, and at the same time, sealing and storing the gas discharged from the goaf to avoid the leakage of harmful gases endangering the environment and personal safety; when the slurry in the middle bin 300 is pumped out, repeat the above steps to add the next batch of slurry to the middle bin 300, and at the same time discharge the goaf gas stored in the middle bin 300 from the air valve 310 and collect it uniformly.

[0055] It should be noted that during the grouting fire prevention process of the present invention, allowing the goaf gas to be discharged into the middle bin 300 through the exhaust pipe 420 can prevent the generation of negative pressure in the middle bin 300. The stable air pressure can reduce the pressure fluctuation during the slurry pumping process, making the slurry pumping smoother, ensuring that the slurry can be continuously and smoothly pumped out, and improving the efficiency of the grouting operation; at the same time, using the middle bin 300 to store the flammable gases such as methane or other toxic gases discharged from the goaf, avoiding direct emission into the atmosphere, reducing environmental pollution and safety risks, and also facilitating the subsequent collection of the goaf gas. By monitoring the gas composition, the environmental conditions of the goaf can be evaluated, providing data support for subsequent environmental governance and safety measures. For the components that can be utilized in the goaf gas, such as methane, resource recovery and utilization can be carried out to reduce energy waste.

[0056] In an embodiment, please refer to Figure 5 and Figure 6 , a batching member 320 is provided at the outlet of the middle bin 300. The batching member 320 includes a batching housing 321 connected to the grouting pump 330. The batching housing 321 is detachably connected to the slurry delivery pipe 410 through a connector 323. A first flow channel 3211 communicating with the connector 323 is opened in the batching housing 321. A number of first communication holes 3212 are provided between the first flow channel 3211 and the grouting pump 330.

[0057] Specifically, the slurry in the middle storage bin 300 is pumped out by the grouting pump 330. The slurry pumped out by the grouting pump 330 is shunted through the first communication holes 3212. Subsequently, the slurry in different regions enters the first flow channel 3211 through the corresponding first communication holes 3212. The slurry flowing into the first flow channel 3211 from each first communication hole 3212 is fused with each other during the process of flowing to the slurry delivery pipe 410, so that the slurry is mixed more evenly.

[0058] It should be noted that by shunting the slurry pumped out by the grouting pump 330 through the first communication holes 3212, the slurry in different regions is fused with each other in the first flow channel 3211, which helps the slurry to be mixed more evenly and improves the grouting quality. The design of the first flow channel 3211 allows the slurry to have a buffering and mixing process before entering the slurry delivery pipe 410, which helps to control the flow rate and pressure of the slurry, reduce the fluctuations during the pumping process. The evenly mixed slurry can reduce the local condensation or blockage of the slurry in the slurry delivery pipe 410 and ensure the continuity and stability of the grouting process.

[0059] Further, please refer to Figure 5 and Figure 7 As shown in the figure, a batching sleeve 321 is rotatably embedded with a batching sleeve pipe 322, and a switching motor 324 for driving the batching sleeve pipe 322 is installed on the moving frame 100. A second flow channel 3221 communicating with the first flow channel 3211 is opened in the batching sleeve pipe 322, and a number of second communication holes 3222 adapted to the first communication holes 3212 are opened on the side wall of the second flow channel 3221.

[0060] Specifically, during the grouting process, the batching sleeve pipe 322 is driven to rotate in the batching sleeve 321 by the switching motor 324 until the second communication holes 3222 are aligned and communicated with the corresponding first communication holes 3212, so that the slurry pumped out by the grouting pump 330 can enter the second flow channel 3221 through the first communication holes 3212 and the second communication holes 3222, and then enter the slurry delivery pipe 410 through the first flow channel 3211 and the connecting head 323.

[0061] When the grouting stops, the batching sleeve pipe 322 is driven to rotate by the switching motor 324 to stagger the second communication holes 3222 from the corresponding first communication holes 3212, so as to isolate the second flow channel 3221 from the middle storage bin 300, thereby realizing the blocking of the slurry delivery channel.

[0062] It should be noted that by switching the motor 324 to drive the batching sleeve 322 to rotate, the alignment of the second communication hole 3222 and the first communication hole 3212 can be precisely controlled, thereby controlling the flow of the slurry and improving the controllability of the grouting process; the design of the batching sleeve 322 allows for dynamic adjustment of the slurry flow path during the grouting process, and the mixing ratio of the slurry can be adjusted as needed; by driving the batching sleeve 322 rotated by the motor, rapid switching of the slurry flow path can be achieved, simplifying the operation process, reducing manual intervention, and improving work efficiency; when the grouting stops, by driving the batching sleeve 322 to rotate to stagger the second communication hole 3222 and the first communication hole 3212, the isolation between the second flow channel 3221 and the central bin 300 is achieved, enhancing the sealing performance of the system, preventing gas leakage or accidental outflow of the slurry during non-grouting periods. Since the design of the batching sleeve 322 and the batching sleeve housing 321 allows for rapid switching and blocking of the slurry delivery channel, system maintenance and cleaning become more convenient.

[0063] In yet another embodiment, please refer to Figure 10 and Figure 11 , a circular flexible film 530 is connected between the exhaust hood 510 and the grouting head 520. A plurality of tension bands 540 connected to the side wall of the exhaust hood 510 are circumferentially distributed on the circular flexible film 530. An extrusion member adapted to the circular flexible film 530 is provided in the exhaust hood 510;

[0064] The extrusion member includes a rotating ring 550 rotatably provided in the exhaust hood 510. A plurality of fan blades 560 are circumferentially provided on the rotating ring 550. A vibrating block 570 in contact with the circular flexible film 530 is further provided on one side of the rotating ring 550;

[0065] Specifically, the circular flexible film 530 has elastic stretching characteristics. When the gas in the gob area enters the exhaust pipe 420 through the exhaust hood 510, an air flow is generated in the exhaust hood 510, thereby driving the movement of the fan blades 560, and then driving the rotating ring 550 to rotate circumferentially inside the exhaust hood 510, so that the vibrating block 570 on the rotating ring 550 moves circumferentially outside the circular flexible film 530. Since the vibrating block 570 is in contact with the circular flexible film 530, the part of the circular flexible film 530 in contact with the vibrating block 570 is radially recessed inward, and at the same time, the corresponding tension band 540 is driven to stretch and expand. Through the periodic depression of different parts of the circular flexible film 530 and the stretching action of the corresponding tension band 540, the slurry entering the grouting head 520 from the slurry delivery pipe 410 is squeezed and disturbed, avoiding the accumulation and blockage of the slurry at the grouting head 520 and improving the smoothness of grouting;

[0066] It is worth noting that, through the periodic depression of the annular flexible capsule 530 and the stretching action of the tension belt 540, the slurry at the grouting head 520 can be effectively squeezed and disturbed, so as to avoid slurry accumulation and blockage, and ensure the continuity and smoothness of the grouting process; the elastic and retractable characteristics of the annular flexible capsule 530 enable the system to automatically respond to airflow changes, realize dynamic squeezing and disturbance of the slurry, and improve the response speed and adjustment ability of the system; the circumferential movement of the vibrating block 570 helps to mix the slurry at the grouting head 520, improve the uniformity of the slurry, and thus improve the grouting quality; in addition, the airflow generated by the gas in the goaf is used to drive the fan blades 560 and the swivel 550 to realize the periodic squeezing of the annular flexible capsule 530 and the stretching of the tension belt 540, without the need for additional energy input, which is energy-saving and environmentally friendly;

[0067] It should be noted that in actual applications, when the gas from the goaf enters the exhaust pipe 420 through the exhaust hood 510, due to the large pressure difference between the goaf and the intermediate chamber 300, which can generally reach 40hPa, the airflow generated when the gas flows through the exhaust hood 510 is sufficient to smoothly drive the fan blades 560 and the swivel 550 to operate, thereby ensuring the periodic squeezing of the annular flexible capsule 530 and the stretching effect of the tension belt 540.

[0068] For further information, see Figure 9 , Figure 12 and Figure 13 The exhaust hood 510 is provided with a plurality of groups of filter screens 511 in the circumferential direction on the outer side thereof, and each group of filter screens 511 is connected with a group of elastic paddles 580 adapted to the vibrating block 570;

[0069] The filter screen 511 outside the exhaust hood 510 can intercept impurities and dirt in the goaf, preventing them from entering the exhaust pipe 420 along with the goaf gas and causing blockage of the exhaust pipe 420, thereby ensuring unobstructed exhaust system; at the same time, it can prevent impurities from entering the middle chamber 300 along with the goaf gas and causing slurry contamination, thereby ensuring grouting quality;

[0070] In addition, when the vibrating block 570 moves in a circumferential direction, the vibrating block 570 can periodically move the elastic paddle 580 in contact with it, so that the elastic paddle 580 produces a reciprocating oscillation effect, thereby causing the corresponding filter screen 511 to vibrate, causing the impurities and dirt intercepted thereon to be shaken off, so as to achieve periodic cleaning of the filter screen 511;

[0071] It should be noted that the elastic paddle 580 is made of elastic material, can undergo elastic deformation when subjected to external force, and return to its original shape after the external force is removed; when the vibrating block 570 moves circumferentially, it can periodically paddle the elastic paddle 580 in contact with it, causing the elastic paddle 580 to produce a reciprocating oscillation effect. The reciprocating oscillation effect of the elastic paddle 580 causes the filter screen 511 in contact with it to vibrate, and this vibration helps to shake off impurities and dirt intercepted on the filter screen 511, thereby achieving periodic cleaning of the filter screen 511.

[0072] In further embodiments, see Figure 14 A driving motor 220 is installed on the top of the material tank 200, and the output end of the driving motor 220 is connected to a driving shaft 230 vertically extending into the material tank 200, and a stirring blade 231 is provided at the lower end of the driving shaft 230; a liftable material disturbing plate 240 is provided in the material tank 200, and a reciprocating lifting member for driving the material disturbing plate 240 is provided in the material tank 200;

[0073] Specifically, the driving motor 220 drives the driving shaft 230 to rotate, so that the stirring blade 231 at the lower end of the driving shaft 230 is used to circumferentially break up and mix the slurry in the material tank 200; at the same time, the reciprocating lifting member drives the disturbing plate 240 to periodically rise and fall in the material tank 200, so that the disturbing plate 240 is used to exchange and fuse the slurries at different levels in the material tank 200; the synergistic effect of the stirring blade 231 and the disturbing plate 240 is used to combine the circumferential stirring of the slurry and the disturbance effects at different levels, so as to prevent the slurry from depositing at the bottom of the material tank 200, maintain the fluidity of the slurry, avoid uneven mixing caused by stratification, ensure the consistency of the slurry components in different regions, make the slurry in the material tank 200 more evenly mixed, and improve the grouting quality.

[0074] For further information, see Figure 15 and Figure 16 The material disturbing plate 240 is provided with a plurality of slots 241 on the circumference thereof, a cover plate 242 is movably provided above the slots 241, a middle partition cylinder 243 for accommodating the driving shaft 230 is provided at the center of the material disturbing plate 240, and an inverted cone-shaped elastic sealing sleeve 244 is connected to the bottom of the middle partition cylinder 243;

[0075] Specifically, when the material-scrambling disc 240 moves downward, the cover plate 242 opens upward under the pressure of the slurry, thereby connecting the corresponding notches 241. At this time, the inverted cone-shaped elastic sealing sleeve 244 is squeezed by the slurry below the material-scrambling disc 240, thereby wrapping the drive shaft 230 and blocking the internal channel of the middle partition cylinder 243. In this way, during the downward movement of the material-scrambling disc 240, the slurry below the material-scrambling disc 240 gradually transfers to the top of the material-scrambling disc 240 through the notches 241.

[0076] When the material-scrambling disk 240 moves upward, the inverted cone-shaped elastic sealing sleeve 244 is squeezed by the slurry above the material-scrambling disk 240, so that the inverted cone-shaped elastic sealing sleeve 244 expands radially outward, and the internal passage of the middle partition cylinder 243 is opened. At this time, since the cover plate 242 cannot be opened downward, the cover plate 242 always blocks the corresponding notch 241. In this way, during the upward movement of the material-scrambling disk 240, the slurry above the material-scrambling disk 240 gradually transfers to the bottom of the material-scrambling disk 240 through the internal passage of the middle partition cylinder 243.

[0077] It is worth noting that when the material disturbance disk 240 moves downward, the cover plate 242 opens, and the slurry flows upward through the notch 241, thereby realizing the transfer of the lower layer of slurry to the upper layer; when the material disturbance disk 240 moves upward, the inverted cone elastic sealing sleeve 244 expands, the internal channel of the middle partition tube 243 opens, and the upper layer of slurry flows downward through the internal channel of the middle partition tube 243, thereby realizing the downward sedimentation of the upper layer of slurry; through the up and down movement of the material disturbance disk 240, the slurry forms a circulating flow in the material tank 200, which improves the fluidity of the slurry and reduces the risk of sedimentation and solidification. The continuous exchange of the upper and lower layers of slurry reduces the stratification phenomenon caused by density differences or composition differences, thereby ensuring the consistency of the slurry;

[0078] It should be noted that the slurry is in a fluid state, and can be a fluid formed by mixing fly ash and water at a water-to-solid ratio of 0.6:1, which has good fluidity. Therefore, during the upward movement of the material-disturbing plate 240, the slurry can smoothly flow downward through the middle partition tube 243 under the extrusion effect and promote the expansion of the inverted cone elastic sealing sleeve 244, so that the slurry on the upper layer of the material-disturbing plate 240 can be smoothly transferred to the lower part of the material-disturbing plate 240 through the middle partition tube 243;

[0079] In addition, in order to promote the transfer of slurry in the upper layer of the disruptor plate 240 to the bottom of the disruptor plate 240 through the middle partition tube 243, in actual application, the height difference between the middle partition tube 243 and the disruptor plate 240 can be reduced accordingly. Optionally, the height difference between the middle partition tube 243 and the disruptor plate 240 should not exceed 2 cm, so as to avoid slurry retention in the area where the upper layer of the disruptor plate 240 is lower than the middle partition tube 243 as much as possible.

[0080] For further information, see Figure 14 and Figure 17, the reciprocating lifting member includes a sliding sleeve 251 circumferentially fixed to the inner wall of the material tank 200. An elevating rack 252 is vertically and slidably sleeved in the sliding sleeve 251. The lower end of the elevating rack 252 is fixedly connected to the material disturbing plate 240. The upper end of the elevating rack 252 is connected to a sliding rod 253 that movably penetrates the material tank 200. A spring 254 is sleeved on the sliding rod 253. A transmission shaft 255 is horizontally and rotatably installed on the inner wall of the material tank 200. An incomplete gear 256 meshing with the elevating rack 252 is installed on the transmission shaft 255. A transmission bevel gear 257 is installed at one end of the transmission shaft 255 facing the drive shaft 230. A drive bevel gear 232 meshing with the transmission bevel gear 257 is provided on the drive shaft 230;

[0081] Specifically, during the process of the drive shaft 230 driving the stirring blade 231 to move, through the meshing transmission of the drive bevel gear 232 and the transmission bevel gear 257, the transmission shaft 255 is driven to rotate synchronously, and then the incomplete gear 256 is driven to rotate. When the tooth part of the incomplete gear 256 meshes with the elevating rack 252, the elevating rack 252 can be driven to slide upward relative to the sliding sleeve 251 to realize the rising of the material disturbing plate 240. When the tooth part of the incomplete gear 256 disengages from the elevating rack 252, the elevating rack 252 can slide downward under the action of the gravity of the material disturbing plate 240 and the elastic force of the spring 254 to realize the lowering of the material disturbing plate 240; repeating like this can realize the reciprocating lifting movement of the material disturbing plate 240, thereby realizing the disturbing effect on different layers of the slurry;

[0082] The drive shaft 230 efficiently transmits power to the transmission shaft 255 through the meshing of the drive bevel gear 232 and the transmission bevel gear 257, realizing the synchronous transmission of power. The meshing and disengagement of the incomplete gear 256 and the elevating rack 252 precisely control the up and down sliding of the elevating rack 252, thus ensuring the coordinated operation of the stirring blade 231 and the material disturbing plate 240; the periodic lifting of the material disturbing plate 240 combined with the circumferential dispersion and mixing of the stirring blade 231 realizes the full disturbance of the upper and lower layers of the slurry, enhancing the mixing uniformity. Through the up and down movement of the material disturbing plate 240, the slurry forms a complex flow path in the material tank 200, increasing the mixing opportunity of the slurry, effectively preventing the deposition and stratification of the slurry at the bottom of the material tank 200, maintaining the fluidity and uniformity of the slurry. The uniformly mixed slurry helps to improve the fluidity and filling property of the slurry during the grouting process, thereby improving the grouting quality.

[0083] It should be noted that since the above-mentioned slurry has good fluidity, the lifting rack 252 and the incomplete gear 256 in the reciprocating lifting member can smoothly extrude the slurry filled at the meshing part during the meshing transmission process, so as not to affect the meshing transmission between the lifting rack 252 and the incomplete gear 256; similarly, the slurry will not affect the meshing between the driving bevel gear 232 and the transmission bevel gear 257.

[0084] In addition, please refer to Figure 14 , in order to prevent the slurry inside the material tank 200 from solidifying, the material tank 200 includes an inner tank 201, a jacket 202 and a housing 203 which are nested in sequence from the inside to the outside, and a heater 260 adapted to the inner tank 201 is installed at the bottom of the material tank 200;

[0085] The heater 260 can heat the slurry in the inner tank 201 to maintain an appropriate temperature, prevent the slurry from becoming too viscous or solidifying due to low temperature, and the jacket 202 can effectively isolate heat, reduce heat loss, maintain the temperature inside the material tank 200, and ensure that the slurry in the material tank 200 always maintains appropriate fluidity to meet the requirements of continuous grouting operation.

[0086] The specific implementation manners of this embodiment are described above, but this embodiment is not limited to the above specific implementation manners. The above specific implementation manners are only illustrative and not restrictive. Under the inspiration of this embodiment, those of ordinary skill in the art can also make many forms, all of which fall within the protection scope of this embodiment.

Claims

1. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf, characterized in that: include: Mobile rack (100); A material tank (200) is arranged on the mobile frame (100), and a material channel valve (210) is installed at the bottom outlet of the material tank (200); A central bin (300) is arranged on the mobile frame (100) and is in communication with the bottom outlet of the material tank (200); an air valve (310) is installed on the top of the central bin (300); and a grouting pump (330) is arranged at the outlet of the central bin (300); The composite pipe (400) comprises a slurry delivery pipe (410) and an exhaust pipe (420), wherein one end of the slurry delivery pipe (410) is connected to the outlet of the middle bin (300), one end of the exhaust pipe (420) is communicated with the interior of the middle bin (300), and the other end of the exhaust pipe (420) penetrates the slurry delivery pipe (410) and is buried in the slurry delivery pipe (410); The end head (500) comprises an exhaust hood (510) and a grouting head (520) which are coaxially distributed, wherein the grouting head (520) is connected to an end of the grouting pipe (410) away from the middle bin (300), and an end of the exhaust pipe (420) away from the middle bin (300) is in communication with the interior of the exhaust hood (510); An annular flexible capsule (530) is connected between the exhaust hood (510) and the grouting head (520); a plurality of tension bands (540) connected to the side wall of the exhaust hood (510) are circumferentially distributed on the annular flexible capsule (530); and an extrusion piece adapted to the annular flexible capsule (530) is arranged inside the exhaust hood (510); The extrusion member comprises a rotating ring (550) rotatably arranged in the exhaust hood (510), a plurality of fan blades (560) being circumferentially arranged on the rotating ring (550), and a vibrating block (570) abutting against the annular flexible capsule (530) being further arranged on one side of the rotating ring (550); A plurality of groups of filter screens (511) are arranged in the circumferential direction of the outer side of the exhaust hood (510), and each group of filter screens (511) is connected to a group of elastic paddles (580) adapted to the vibrating block (570).

2. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 1, characterized in that: A batching component (320) is provided at the outlet of the central bin (300), the batching component (320) comprising a batching casing (321) connected to a grouting pump (330), the batching casing (321) and a slurry delivery pipe (410) being detachably connected via a connector (323), a first flow channel (3211) communicating with the connector (323) being provided in the batching casing (321), and a plurality of first communication holes (3212) being provided between the first flow channel (3211) and the grouting pump (330).

3. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 2, characterized in that: A batching sleeve (322) is rotatably embedded in the batching sleeve shell (321), and a switching motor (324) for driving the batching sleeve (322) is installed on the movable frame (100); a second flow channel (3221) communicating with the first flow channel (3211) is provided in the batching sleeve (322), and a plurality of second communication holes (3222) adapted to match the first communication holes (3212) are provided on the side wall of the second flow channel (3221).

4. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 1, characterized in that: A driving motor (220) is installed on the top of the material tank (200); an output end of the driving motor (220) is connected to a driving shaft (230) vertically extending into the material tank (200); a stirring blade (231) is provided at the lower end of the driving shaft (230); a liftable material disturbing disk (240) is provided in the material tank (200); and a reciprocating lifting member for driving the material disturbing disk (240) is provided in the material tank (200).

5. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 4, characterized in that: The material disturbance disk (240) is provided with a plurality of slots (241) on its circumference, a cover plate (242) is movably provided above the slots (241), a middle partition cylinder (243) for accommodating the drive shaft (230) is provided at the center of the material disturbance disk (240), and an inverted cone-shaped elastic sealing sleeve (244) is connected to the bottom of the middle partition cylinder (243).

6. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 4, characterized in that: The reciprocating lifting member comprises a sliding sleeve (251) circumferentially fixed on the inner wall of the material tank (200); a vertical sliding sleeve in the sliding sleeve (251) is provided with a lifting rack (252); the lower end of the lifting rack (252) is fixedly connected to the material disturbing plate (240); the upper end of the lifting rack (252) is connected to a sliding rod (253) that movably penetrates the material tank (200); and a spring (254) is sleeved on the sliding rod (253); A transmission shaft (255) is also rotatably mounted on the inner wall of the material tank (200), an incomplete gear (256) meshing with the lifting rack (252) being mounted on the transmission shaft (255), a transmission bevel gear (257) being mounted on one end of the transmission shaft (255) facing the drive shaft (230), and a drive bevel gear (232) meshing with the transmission bevel gear (257) being provided on the drive shaft (230).

7. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 6, characterized in that: The material tank (200) comprises an inner liner (201), a jacket (202), and an outer shell (203) which are nested in sequence from the inside to the outside, and a heater (260) adapted to the inner liner (201) is installed at the bottom of the material tank (200).

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