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

Abstract

The invention relates to the technical field of coal mine fire prevention, and particularly discloses a grouting device for preventing and controlling spontaneous combustion of residual coal in a coal mine goaf. The material tank is arranged on the movable frame; the middle bin is communicated with an outlet in the bottom of the material tank; the composite pipe comprises a slurry conveying pipe and an exhaust pipe; and the end comprises an exhaust hood and a grouting head which are coaxially distributed. In the grouting fire prevention process, gas in the goaf is exhausted into the middle bin through the exhaust pipe, negative pressure in the middle bin can be prevented, pressure fluctuation in the slurry pumping process can be reduced through the stability of air pressure, slurry pumping is smoother, and it is ensured that slurry can be continuously and smoothly pumped out; meanwhile, flammable gas containing methane and the like or other poisonous gas exhausted from the goaf is stored through the middle bin and prevented from being directly exhausted into the atmosphere, environmental pollution and safety risks are reduced, and follow-up collection of the gas in the goaf is facilitated.

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. 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; 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

[0003] 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.

[0004] The purpose of the present invention can be achieved by the following technical solutions: A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf, comprising: Mobile racks; A material tank is arranged on a mobile rack, and a material channel valve is installed at the bottom outlet of the material tank; 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; 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; 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 connected to the inside of the exhaust hood.

[0005] As a further solution of the present invention: a batching component is arranged at the outlet of the central bin, and the batching component includes a batching shell connected to the grouting pump, the batching shell and the slurry delivery pipe are detachably connected through a connecting head, a first flow channel connected to the connecting head is opened in the batching shell, and a plurality of first connecting holes are arranged between the first flow channel and the grouting pump.

[0006] As a further solution of the present invention: a batching sleeve is rotatably embedded in the batching sleeve shell, and a switching motor for driving the batching sleeve is installed on the movable frame; a second flow channel connected to the first flow channel is opened in the batching sleeve, and a plurality of second connecting holes adapted to the first connecting holes are opened on the side wall of the second flow channel.

[0007] As a further solution of the present invention: an annular flexible capsule is connected between the exhaust hood and the grouting head, a plurality of tension bands connected to the exhaust hood side wall are distributed circumferentially on the annular flexible capsule, and an extrusion piece adapted to the annular flexible capsule is arranged in the exhaust hood.

[0008] As a further solution of the present invention: the extrusion member includes a swivel ring rotatably arranged in the exhaust hood, a plurality of fan blades are circumferentially arranged on the swivel ring, and a vibrating block abutting against the annular flexible capsule is also arranged on one side of the swivel ring.

[0009] As a further solution of the present invention: a plurality of groups of filter screens are arranged circumferentially on the outer side of the exhaust hood, and each group of filter screens is connected to a group of elastic paddles adapted to the vibrating block.

[0010] 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 a stirring blade is arranged at the lower end of the driving shaft; a liftable disturbing plate is arranged in the material tank, and a reciprocating lifting member for driving the disturbing plate is arranged in the material tank.

[0011] As a further solution of the present invention: a plurality of slots are opened on the circumference of the material disturbance disk, a cover plate is movably arranged above the slots, a partition cylinder for accommodating the drive shaft is arranged at the center of the material disturbance disk, and an inverted cone elastic sealing sleeve is connected to the bottom of the partition cylinder.

[0012] 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 vertical sliding sleeve inside the sliding sleeve is provided with a lifting rack, the lower end of the lifting rack is fixedly connected to the material disturbing plate, the upper end of the lifting rack is connected to a sliding rod that movably penetrates the material tank, and a spring is provided on the sliding rod; A transmission shaft is also horizontally rotatably mounted on the inner wall of the material tank, an incomplete gear meshing with the lifting rack is mounted on the transmission shaft, a transmission bevel gear is mounted on one end of the transmission shaft facing the drive shaft, and a drive bevel gear meshing with the transmission bevel gear is provided on the drive shaft.

[0013] As a further solution of the present invention: the material tank comprises an inner liner, a jacket and an outer shell which are nested in sequence from the inside to the outside, and a heater adapted to the inner liner is installed at the bottom of the material tank.

[0014] Beneficial effects of the present invention: The present invention can prevent the generation of negative pressure in the central bin by discharging the gas in the goaf through the exhaust pipe during the grouting fire prevention process, and the stable air pressure can reduce the pressure fluctuation in the slurry pumping process, so that the slurry pumping is smoother, ensuring that the slurry can be continuously and smoothly pumped out, thereby improving the efficiency of the grouting operation; at the same time, the central bin is used to store flammable gases such as methane or other toxic gases discharged from the goaf, so as to avoid direct discharge into the atmosphere, reduce environmental pollution and safety risks, and facilitate the subsequent collection of goaf gas. By monitoring the gas composition and evaluating the environmental conditions of the goaf, data support is provided for subsequent environmental management and safety measures, and the usable components in the gas in the goaf can be recycled and utilized as resources, thereby reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the accompanying drawings.

[0016] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 A three-dimensional schematic diagram of another viewing angle of the present invention; Figure 3 It is a schematic diagram of the structure of the intermediate material tank, the intermediate bin and the composite pipe of the present invention; Figure 4 It is a structural schematic diagram of the intermediate material tank, the intermediate bin and the composite pipe from another perspective of the present invention; Figure 5 It is a cross-sectional view of the composite pipe and the intermediate chamber in the present invention; Figure 6 It is a structural schematic diagram of the ingredient casing in the present invention; Figure 7 It is a structural schematic diagram of the batching member in the present invention; Figure 8 It is a schematic diagram of the structure of the terminal in the present invention; Fig. 9 It is a structural schematic diagram of another viewing angle of the terminal in the present invention; Fig.10 is a cross-sectional view of the end cap in the present invention; Fig.11 for Fig.10 Enlarged view of point A in the middle; Fig.12 A cross-sectional view of the end of the present invention from another perspective; Fig.13 for Fig.12 Enlarged view of point B in the middle; Fig.14 It is a cross-sectional view of the material tank in the present invention; Fig.15 It is a structural schematic diagram of the material disturbance plate in the present invention; Fig.16 It is a side view of the material disturbance plate in the present invention; Fig.17 for Fig.14 Enlarged view of center C.

[0017] In the figure: 100. Mobile rack; 200, material tank; 201, liner; 202, jacket; 203, shell; 210, material channel valve; 220, drive motor; 230, drive shaft; 231, stirring blade; 232, drive bevel gear; 240, disturbing plate; 241, notch; 242, cover plate; 243, middle partition cylinder; 244, inverted cone elastic sealing sleeve; 251, sliding sleeve; 252, lifting rack; 253, sliding rod; 254, spring; 255, transmission shaft; 256, incomplete gear; 257, transmission bevel gear; 260, heater; 300, middle bin; 310, air valve; 320, batching member; 321, batching casing; 3211, first flow channel; 3212, first connecting hole; 322, batching casing; 3221, second flow channel; 3222, second connecting hole; 323, connector; 324, switching motor; 330, grouting pump; 400, composite pipe; 410, slurry pipe; 420, exhaust pipe; 500, end cap; 510, exhaust hood; 511, filter screen; 520, grouting head; 530, annular flexible capsule; 540, tension belt; 550, swivel; 560, fan blade; 570, vibrating block; 580, elastic pick. DETAILED DESCRIPTION

[0018] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that the discussion of these embodiments is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Each example may omit, replace or add various processes or components as needed. In addition, the features described relative to some examples may also be combined in other examples.

[0019] See also Figure 1 and Figure 2The present invention discloses a grouting device for preventing and controlling spontaneous combustion of coal residue in a coal mine goaf, comprising a mobile frame 100, a material tank 200, a central bin 300, a composite pipe 400 and an end 500; See also 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; See also Figure 5 The middle bin 300 is arranged on the mobile frame 100 and is connected to the bottom outlet of the material tank 200. An air valve 310 is installed on the top of the middle bin 300, and a grouting pump 330 is arranged at the outlet of the middle 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 middle bin 300, and one end of the exhaust pipe 420 is connected to the inside of the middle bin 300. The other end of the exhaust pipe 420 passes through the slurry delivery pipe 410 and is buried in the slurry delivery pipe 410. See also Figure 8 and Fig. 9 The end 500 includes an exhaust hood 510 and a grouting head 520 which are coaxially distributed. 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 connected to the inside of the exhaust hood 510; Specifically, before grouting, the material channel valve 210 and the air valve 310 are opened to open the passage between the material tank 200 and the intermediate bin 300, and the slurry in the material tank 200 is injected into the intermediate bin 300. At the same time, the air in the intermediate bin 300 is discharged from the air valve 310 until the intermediate bin 300 is completely filled with the slurry. Then, the material channel valve 210 and the air valve 310 are closed to close the interior of the intermediate bin 300. The end head 500 at the end of the slurry delivery pipe 410 is inserted into the goaf of the coal mine through a pre-opened hole, and the gap between the end head 500 and the hole is sealed. The grouting pump 330 is turned on to pump the slurry in the intermediate bin 300 into the end head 500 through the slurry delivery pipe 410. Then, the slurry is injected into the goaf through the grouting head 520. During the process, as the slurry gradually fills the internal space of the goaf, the air pressure in the goaf increases, which causes the gas in the goaf to enter the exhaust pipe 420 through the exhaust hood 510, and then enter the intermediate bin 300 along the exhaust pipe 420, thereby compensating for the negative pressure in the intermediate bin 300 caused by the pumping of the slurry, so as to maintain the air pressure in the intermediate bin 300 stable, ensure that the slurry can be continuously and smoothly pumped out, and at the same time, the gas discharged from the goaf is sealed and stored to prevent harmful gas leakage from endangering the environment and personal safety; when the slurry in the intermediate bin 300 is pumped, repeat the above steps to fill the intermediate bin 300 with the next batch of slurry, and at the same time, the goaf gas stored in the intermediate bin 300 is discharged from the gas valve 310 and collected uniformly.

[0020] It should be noted that, during the grouting fire prevention process, the present invention allows the gas in the goaf to be discharged into the central bin 300 through the exhaust pipe 420, which can prevent the generation of negative pressure in the central 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, the central bin 300 is used to store flammable gases such as methane or other toxic gases discharged from the goaf to avoid direct discharge into the atmosphere, reduce environmental pollution and safety risks, and facilitate the subsequent collection of goaf gas. By monitoring the gas composition and evaluating the environmental conditions of the goaf, data support is provided for subsequent environmental management and safety measures. For the usable components in the gas in the goaf, such as methane, resources can be recycled and utilized to reduce energy waste.

[0021] In one embodiment, see Figure 5 and Figure 6 A batching member 320 is provided at the outlet of the central bin 300, and the batching member 320 includes a batching casing 321 connected to a grouting pump 330, and the batching casing 321 is detachably connected to the slurry delivery pipe 410 via a connector 323, and a first flow channel 3211 connected to the connector 323 is provided in the batching casing 321, and a plurality of first communication holes 3212 are provided between the first flow channel 3211 and the grouting pump 330; Specifically, the slurry in the middle bin 300 is pumped out by the grouting pump 330, and the slurry pumped out by the grouting pump 330 is divided through the first connecting hole 3212, and then the slurry in different areas enters the first flow channel 3211 through the corresponding first connecting hole 3212, and the slurry flowing into the first flow channel 3211 from each first connecting hole 3212 merges with each other in the process of flowing to the slurry delivery pipe 410, so that the slurry is mixed more evenly; It should be noted that the slurry pumped out by the grouting pump 330 is diverted through the first connecting hole 3212, and the slurries in different areas are merged with each other in the first flow channel 3211, which helps to mix the slurry more evenly and improve 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 pipe 410, which helps to control the flow rate and pressure of the slurry and reduce fluctuations during the pumping process. The evenly mixed slurry can reduce local condensation or blockage of the slurry in the slurry pipe 410, thereby ensuring the continuity and stability of the grouting process.

[0022] For further information, see Figure 5 and Figure 7A 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 mobile frame 100; a second flow channel 3221 communicating with the first flow channel 3211 is opened in the batching sleeve 322, and a plurality of second communication holes 3222 adapted to the first communication holes 3212 are opened on the side wall of the second flow channel 3221; Specifically, during the grouting process, the mixing sleeve 322 is driven to rotate in the mixing sleeve shell 321 by switching the motor 324 until the second connecting hole 3222 is aligned and connected with the corresponding first connecting hole 3212, so that the slurry pumped out by the grouting pump 330 can enter the second flow channel 3221 through the first connecting hole 3212 and the second connecting hole 3222, and then enter the slurry delivery pipe 410 through the first flow channel 3211 and the connector 323; When grouting is stopped, the mixing sleeve 322 is driven to rotate by switching the motor 324 so that the second connecting hole 3222 and the corresponding first connecting hole 3212 are staggered with each other, so that the second flow channel 3221 and the central chamber 300 are isolated from each other, thereby blocking the slurry delivery channel.

[0023] It is worth noting that by switching the motor 324 to drive the batching sleeve 322 to rotate, the alignment of the second connecting hole 3222 and the first connecting hole 3212 can be accurately controlled, thereby controlling the flow of the slurry and improving the controllability of the grouting process; the design of the batching sleeve 322 allows the flow path of the slurry to be dynamically adjusted during the grouting process, and the mixing ratio of the slurry can be adjusted as needed; the rotation of the batching sleeve 322 driven by the motor can achieve rapid switching of the slurry flow path, simplify the operating process, reduce manual intervention, and improve work efficiency; when the grouting is stopped, the second connecting hole 3222 and the first connecting hole 3212 are staggered by driving the batching sleeve 322 to rotate, so as to achieve the isolation of the second flow channel 3221 from the central chamber 300, thereby enhancing the sealing performance of the system and preventing gas leakage or accidental outflow of slurry during non-grouting period. Since the design of the batching sleeve 322 and the batching sleeve shell 321 allows rapid switching and blocking of the slurry delivery channel, system maintenance and cleaning become more convenient.

[0024] In yet another embodiment, see Fig.10 and Fig.11 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 distributed circumferentially on the annular flexible capsule 530. An extrusion piece adapted to the annular flexible capsule 530 is arranged in the exhaust hood 510. The extrusion member includes a rotating ring 550 rotatably disposed in the exhaust cover 510, a plurality of blades 560 are circumferentially disposed on the rotating ring 550, and a vibrating block 570 abutting against the annular flexible capsule 530 is also disposed on one side of the rotating ring 550; Specifically, the annular flexible capsule 530 has elastic expansion characteristics. When the gas in the goaf enters the exhaust pipe 420 through the exhaust hood 510, airflow is generated in the exhaust hood 510, thereby driving the fan blades 560 to move, and then driving the swivel 550 to rotate circumferentially in the exhaust hood 510, so that the vibrating block 570 on the swivel 550 moves circumferentially on the outside of the annular flexible capsule 530. Since the vibrating block 570 abuts against the annular flexible capsule 530, the contact portion of the annular flexible capsule 530 and the vibrating block 570 is radially concave inward, and at the same time, the corresponding tension belt 540 is driven to generate stretching and expansion. Through the periodic depression of different parts of the annular flexible capsule 530 and the stretching action of the corresponding tension belt 540, the slurry entering the grouting head 520 from the slurry delivery pipe 410 is squeezed and disturbed, so as to avoid the accumulation and blockage of the slurry at the grouting head 520, and improve the patency of grouting. 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; 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.

[0025] For further information, see Fig. 9 , Fig.12 and Fig.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; 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; 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; 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.

[0026] In further embodiments, see Fig.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; 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.

[0027] For further information, see Fig.15 and Fig.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; 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. 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. 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; 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; 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.

[0028] For further information, see Fig.14 and Fig.17The reciprocating lifting member includes a sliding sleeve 251 circumferentially fixed on the inner wall of the material tank 200, and a lifting rack 252 is provided in a vertical sliding sleeve in the sliding sleeve 251. The lower end of the lifting rack 252 is fixedly connected to the disturbing plate 240, and the upper end of the lifting rack 252 is connected to a slide bar 253 that movably penetrates the material tank 200, and a spring 254 is sleeved on the slide bar 253; a transmission shaft 255 is also horizontally rotatably installed on the inner wall of the material tank 200, and an incomplete gear 256 meshing with the lifting rack 252 is installed on the transmission shaft 255. A transmission bevel gear 257 is installed 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 is provided on the drive shaft 230; Specifically, in the process of driving the stirring blade 231 to move by the driving shaft 230, the driving bevel gear 232 and the transmission bevel gear 257 are meshed and driven to drive the transmission shaft 255 to rotate synchronously, thereby driving the incomplete gear 256 to rotate. When the gear portion of the incomplete gear 256 is meshed with the lifting rack 252, the lifting rack 252 can be driven to slide upward relative to the sliding sleeve 251 to achieve the rise of the material disturbance plate 240. When the gear portion of the incomplete gear 256 is disengaged from the lifting rack 252, the lifting rack 252 can slide downward under the gravity of the material disturbance plate 240 and the elastic force of the spring 254 to achieve the descent of the material disturbance plate 240; this reciprocating movement can achieve the reciprocating lifting and lowering movement of the material disturbance plate 240, thereby achieving the disturbance effect of different levels of the slurry; The drive shaft 230 efficiently transmits power to the transmission shaft 255 through the meshing of the driving bevel gear 232 and the transmission bevel gear 257, thereby realizing synchronous power transmission. The meshing and disengagement of the incomplete gear 256 and the lifting rack 252 accurately controls the up and down sliding of the lifting rack 252, thereby ensuring the coordinated operation of the stirring blade 231 and the disturbance plate 240. The periodic lifting and lowering of the disturbance plate 240 is combined with the circumferential breaking and mixing of the stirring blade 231 to achieve sufficient disturbance of the upper and lower layers of the slurry and enhance the mixing uniformity. Through the up and down movement of the disturbance plate 240, the slurry forms a complex flow path in the material tank 200, which increases the mixing opportunity of the slurry and effectively prevents the deposition and stratification of the slurry at the bottom of the material tank 200, maintaining the fluidity and uniformity of the slurry. The evenly mixed slurry helps to improve the fluidity and filling property of the slurry during the grouting process, thereby improving the grouting quality.

[0029] It should be noted that since the above-mentioned slurry itself has good fluidity, the lifting rack 252 and the incomplete gear 256 in the reciprocating lifting member can smoothly squeeze out the slurry filled in the meshing position during the meshing transmission process, thereby not affecting the meshing transmission between the lifting rack 252 and the incomplete gear 256; similarly, the slurry will not affect the meshing of the driving bevel gear 232 and the transmission bevel gear 257.

[0030] Also, see Fig.14 In order to prevent the slurry inside the material tank 200 from solidifying, the material tank 200 includes an inner liner 201, a jacket 202 and an outer shell 203 which are nested 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; The heater 260 can heat the slurry in the inner tank 201 to maintain a suitable temperature and prevent the slurry from becoming too viscous or solidified due to low temperature. The jacket 202 can effectively isolate heat, reduce heat loss, maintain the internal temperature of the tank 200, and ensure that the slurry in the tank 200 always maintains suitable fluidity to meet the needs of continuous grouting operations.

[0031] The specific implementation methods of this embodiment are described above, but this embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Ordinary technicians in this field can also make many forms inspired by this embodiment, all of which are within the protection 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 connected to the interior of the exhaust hood (510).

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: 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).

5. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 4, characterized in that: 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) is also arranged on one side of the rotating ring (550).

6. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 5, characterized in that: 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).

7. 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).

8. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 7, 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).

9. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 7, 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).

10. A grouting device for preventing and controlling spontaneous combustion of coal in coal mine goaf according to claim 8, 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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