Guniting fire preventing and extinguishing device for coal mine goaf

Abstract

The invention relates to the technical field of coal mine fire prevention and extinguishing, in particular to a coal mine goaf guniting fire prevention and extinguishing device which comprises a supporting disc, a driving shaft rotationally penetrates through the supporting disc, a rotating disc is rotationally arranged on one side of the supporting disc, the driving shaft penetrates through the rotating disc, and a guniting device is arranged on the rotating disc and comprises a circulation hole formed in the driving shaft. A circulating hole is formed in the rotating disc, an annular cavity communicated with the circulating hole is formed in the rotating disc, a plurality of sliding holes evenly distributed in the circumferential direction are formed in the rotating disc, spraying pipes are arranged in the sliding holes, and a spraying head is arranged at one end of each spraying pipe. The slurry can be uniformly sprayed to each part of the goaf to form a uniform fireproof layer, the angle of the spray head is continuously changed in the spraying process, each corner of the goaf can be covered, and the fire preventing and extinguishing effect is improved.

Description

Technical Field

[0001] This application relates to the technical field of coal mine fire prevention and extinguishing, and particularly to a slurry spraying fire prevention and extinguishing device for a coal mine gob area. Background Art

[0002] A coal mine gob area refers to an underground cavity area formed during the coal mining process due to the extraction of coal resources. As coal is mined, the original coal seam is emptied, causing the overlying strata to lose support, and then move, fracture, or even collapse, forming a gob area. The formation of the gob area is an inevitable phenomenon in the coal mining process, and its size and shape depend on factors such as the mining method, coal seam thickness, burial depth, and geological conditions.

[0003] A large amount of heat is released during the oxidation process of coal. When the heat accumulates to a certain extent, it will cause the spontaneous combustion of coal. The spontaneous combustion of coal not only causes waste of coal resources but also may trigger underground fires, seriously threatening the lives of miners and the normal production of coal mines. To effectively address the problem of spontaneous combustion of coal in the gob area, generally, a slurry material with fire prevention and extinguishing functions is sprayed into the gob area to form a protective layer to isolate oxygen and prevent coal oxidation, thereby achieving the purpose of fire prevention and extinguishing.

[0004] For example, the coal mine gob area slurry spraying fire prevention and extinguishing device and method with the application number CN201810876657.2 relate to the technical field of coal mine fire prevention. This prior art includes a grouting pump, a spraying steel pipe, a grouting hose, and a horizontally arranged support rod. The spraying steel pipe is vertically arranged with respect to the support rod and is located above the support rod. Spray branches are respectively arranged on the left and right sides of the front end of the spraying steel pipe. The included angle between the spray branch and the spraying steel pipe is an acute angle. Sprayers are installed at the front ends of both the spray branch and the front end of the spraying steel pipe. A driving mechanism for driving the spraying steel pipe to swing up and down with the support rod as a fulcrum is connected to the bottom of the rear side of the spraying steel pipe. In addition, a spraying fire prevention and extinguishing method for the coal mine gob area slurry spraying fire prevention and extinguishing device is also disclosed. In the spraying operation, only the clamps at both ends of the support rod need to be manually fixed and installed on adjacent two hydraulic supports. The spraying process does not require manual operation, reducing the labor intensity of workers, and the spraying amount, spraying distance, and area can be adjusted, and the operation is very convenient. By spraying slurry on the roof and floor of the gob area, it plays a dual role of prevention and extinguishing.

[0005] However, there are still some defects in the above prior art when it comes to slurry spraying fire prevention and extinguishing:

[0006] The shotcreting steel pipe in the above prior art is the main conveying channel for shotcreting materials. Spray branches and nozzles are respectively arranged at the front end and both sides of the shotcreting steel pipe. The shotcreting steel pipe is fixed by a support rod and can swing up and down under the drive of a driving mechanism to achieve full coverage of the gob area. However, in the actual application process of shotcreting, the shotcreting steel pipe covers the roof and floor of the gob area by swinging up and down. This design can effectively spray the roof and floor in theory. However, in actual operation, the swinging range and angle are limited, which may lead to insufficient shotcreting coverage on both sides of the gob area. When the shotcreting steel pipe swings up and down, the main spraying direction of the nozzle is concentrated on the roof and floor, while the shotcreting coverage on both sides is relatively small.

[0007] Insufficient shotcreting on both sides of the gob area means that the contact area of these areas with air is large, and oxygen is more likely to penetrate into the coal seam. This situation not only increases the possibility of coal spontaneous combustion but also may affect the fire prevention and extinguishing effect of the entire gob area.

[0008] In addition, the width of the gob area also changes with the progress of mining. Especially in steeply inclined coal seams or complex geological conditions, the shape of the gob area may be irregular, while the length of the shotcreting steel pipe is constant. It is difficult for a fixed-length shotcreting steel pipe to cover areas with different widths, which may lead to insufficient shotcreting in some areas and excessive shotcreting in other areas.

[0009] Based on this, under the statement of the above viewpoints, there is still room for improvement in the prior art's method of shotcreting for fire prevention and extinguishing. Summary of the Invention

[0010] To solve the above technical problems, the present application provides a shotcreting fire prevention and extinguishing device for a coal mine gob area, adopting the following technical solutions:

[0011] A shotcreting fire prevention and extinguishing device for a coal mine gob area includes a support disk, a driving shaft is rotatably penetrated through the support disk, a turntable is rotatably arranged on one side of the support disk, the driving shaft penetrates through the turntable, and a shotcreting device is arranged on the turntable;

[0012] The shotcreting device includes a circulation hole opened in the driving shaft, an annular cavity communicating with the circulation hole is constructed in the turntable, a plurality of sliding holes evenly distributed in the circumferential direction are arranged on the turntable, the sliding holes communicate with the annular cavity, a spray pipe is arranged in the sliding hole, and a nozzle is arranged at one end of the spray pipe.

[0013] Preferably, the shotcreting device further includes that the connection between the nozzle and the spray pipe is configured as a rotational connection, a rotating gear is arranged on the nozzle, and a toothed ring meshing with the rotating gear is arranged on the support disk;

[0014] The spray pipe is slidably arranged in the sliding hole, a connecting ring is arranged on the spray pipe, and a return spring is arranged between the connecting ring and the turntable.

[0015] Preferably, one end of the nozzle is configured with a bent section, and the bending direction of the bent section is away from the support disk, and the nozzle is rotatably arranged at one end of the bent section.

[0016] Preferably, the toothed ring includes arc-shaped sections corresponding to the nozzles one by one, and adjacent two arc-shaped sections are movably connected, and the angle of the arc-shaped section corresponds to the bending angle of the bent section of the nozzle.

[0017] Preferably, an adjusting member connected to the toothed ring is arranged on the support disk;

[0018] The adjusting member includes connection grooves arranged on the support disk corresponding to the nozzles one by one, a connecting rod is slidably arranged in the connection groove, one end of the connecting rod penetrates through the support disk and then a connection block is arranged, and the connection block is connected to the corresponding arc-shaped section.

[0019] Preferably, accommodation grooves corresponding to the connecting rods one by one are formed on the support disk, and a transmission gear threadedly connected to the connecting rod is rotatably arranged in the accommodation groove;

[0020] An adjusting toothed ring meshing with a plurality of transmission gears is rotatably arranged on the support disk.

[0021] Preferably, an arc-shaped guide bar is arranged on one side of the arc-shaped section, an arc-shaped guide groove is formed in the arc-shaped guide bar, and a sliding guide bar is slidably arranged in the arc-shaped guide grooves of adjacent two arc-shaped guide bars together.

[0022] Preferably, a plurality of arc-shaped guide bars are connected through the sliding guide bar to form a guiding ring, and a guide wheel abutted against the guiding ring is arranged on the nozzle.

[0023] Preferably, a flame-retardant jetting member is arranged on the connecting rod;

[0024] The flame-retardant jetting member includes connection cavities formed in the support disk corresponding to a plurality of connection grooves one by one, a connection through hole is formed in the connecting rod, and a nozzle is arranged at one end of the connecting rod.

[0025] Preferably, the nozzle includes an adapter tube arranged at the upper end of the connecting rod, the adapter tube is communicated with the connection through hole, a rotating spray port is rotatably arranged on the adapter tube, the rotating spray port is communicated with the inside of the connection tube, and a rotating shaft connected to the rotating spray port is rotatably arranged in the adapter tube.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The present invention enables the nozzle to spray slurry in a more complex manner through double rotational motions (revolution + rotation), thereby achieving a more uniform slurry spraying coverage. As a result, the slurry can be evenly sprayed onto various parts of the goaf, forming a uniform fireproof layer. During the spraying process, the nozzle continuously changes its angle, capable of covering every corner of the goaf, including the coal seams and rock formations on both sides. The uniform slurry spraying coverage can more effectively isolate oxygen and heat, reducing the risk of coal spontaneous combustion. The rotation mechanism of the nozzle helps to form a thicker fireproof layer, enhancing the fire prevention and extinguishing effect.

[0028] 2. By adjusting the rotation of the gear ring, the present invention can precisely control the movement of the connecting rod, thereby achieving precise control of the nozzle position and adapting to different slurry spraying requirements to improve the uniformity and coverage effect of slurry spraying. For example, under different goaf heights or widths, the slurry spraying effect can be optimized by adjusting the nozzle position.

[0029] 3. The gas ejected from the nozzle of the present invention will come into contact with the slurry, breaking up the ejected slurry. The broken-up slurry forms finer droplets, which can more evenly cover the surface of the goaf, increasing the coverage area of slurry spraying. The finer slurry droplets are more likely to penetrate into the fissures of the coal seams and rock formations, enhancing the bonding force between the slurry and the coal and rock, and further improving the fire prevention and extinguishing effect.

[0030] 4. The flame retardant gas ejected by the present invention can also replace the air. Due to the density and diffusion characteristics of the flame retardant gas, they will gradually displace the air in the goaf. Specifically, the flame retardant gas will form a protective layer in the space, pushing out the original air (including oxygen). Through air replacement, the oxygen concentration in the goaf will be significantly reduced. Oxygen is a necessary condition for combustion, and reducing the oxygen concentration can effectively inhibit the combustion reaction, thereby preventing the spread of fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the present invention.

[0032] Figure 2 is a sectional view of the present invention.

[0033] Figure 3 is a sectional view of the turntable of the present invention.

[0034] Figure 4 is the present invention Figure 3 partial enlarged view of part A.

[0035] Figure 5 is a schematic structural diagram of the slurry sprayer of the present invention.

[0036] Figure 6 is the present invention Figure 5 partial enlarged view of part B.

[0037] Figure 7 This is a schematic structural view of the toothed ring of the present invention.

[0038] Figure 8 This is a schematic structural view among the arc section, arc guide bar and sliding guide bar of the present invention.

[0039] Figure 9 This is a cross-sectional view of the support disk of the present invention.

[0040] Figure 10 This is the present invention Figure 9 Partial enlarged view at position C.

[0041] Figure 11 This is a schematic structural view of the flame-retardant jet part of the present invention.

[0042] Figure 12 This is a schematic structural view of the nozzle of the present invention.

[0043] Explanation of reference numerals: 1, support disk; 11, drive shaft; 12, turntable; 2, spraying device; 21, flow hole; 22, annular cavity; 23, sliding hole; 24, spray pipe; 241, bent section; 25, nozzle; 26, rotating gear; 27, toothed ring; 271, arc section; 28, connecting ring; 29, return spring; 3, adjusting part; 31, connecting groove; 32, connecting rod; 33, connecting block; 34, accommodating groove; 35, transmission gear; 36, adjusting gear ring; 4, guiding ring; 41, arc guide bar; 42, arc guide groove; 43, sliding guide bar; 44, guide wheel; 5, flame-retardant jet part; 51, connecting cavity; 52, connecting through hole; 6, nozzle; 61, adapter tube; 62, rotating spray port; 63, rotating shaft. Detailed implementation manners

[0044] The following Figures 1 to 12 further elaborates on the present application in detail.

[0045] The embodiment of the present application discloses a spraying and fire prevention device for coal mine gob areas. The double rotational motion (revolution + rotation) enables the nozzle to spray slurry in a more complex manner, not only improving the uniformity and coverage effect of spraying, but also enhancing the adaptability of the device to different gob conditions.

[0046] Embodiment:

[0047] Refer to Figure 1 、 Figure 2 and Figure 3As shown in the figure, a shotcreting fire prevention and extinguishing device for goaf in coal mines includes a support disk 1. The support disk 1 is installed on coal mining equipment or the rear end beam to ensure that the entire shotcreting device can move with the movement of the coal mining equipment. A driving shaft 11 is rotatably penetrated through the support disk 1. A turntable 12 is rotatably arranged on one side of the support disk 1. The driving shaft 11 penetrates through the turntable 12. The underground cavity area formed by the extraction of coal resources is the goaf.

[0048] When shotcreting the goaf, the driving shaft 11 is driven to rotate by a motor. The rotating driving shaft 11 will drive the turntable 12 to rotate synchronously. During the rotation of the turntable 12, the shotcreting device 2 arranged on the turntable 12 will spray the slurry on the goaf. The shotcreting device 2 rotates with the rotation of the turntable 12. The shotcreting device 2 is responsible for evenly spraying the prepared slurry onto the goaf.

[0049] During the shotcreting process, the shotcreting device 2 continuously rotates and sprays the slurry into every corner of the goaf. The rotational movement of the shotcreting device 2 combined with the movement of the coal mining equipment enables the shotcreting operation to cover the entire goaf, including the roof, floor, and coal seams and rock formations on both sides. The sprayed slurry forms a protective layer on the surface of the goaf, isolating the coal from contact with oxygen and preventing the oxidation of coal, thereby preventing the spontaneous combustion of coal.

[0050] During the rotation of the turntable 12, a centrifugal force will be generated, giving the slurry an acceleration. The centrifugal force enables the slurry to obtain an additional tangential acceleration when leaving the shotcreting device 2, thereby increasing the spraying distance of the slurry. This enables the shotcreting device 2 to cover the goaf at a farther distance, expanding the effective range of shotcreting, making the shotcreting process faster, which helps to complete the large-area shotcreting operation in a shorter time and improve the overall shotcreting efficiency.

[0051] Refer to Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown in the figure, specifically, the shotcreting device 2 includes a circulation hole 21 opened in the driving shaft 11. An annular cavity 22 communicating with the circulation hole 21 is constructed in the turntable 12. When shotcreting the goaf, the slurry is input into the circulation hole 21 through a water pump, and the slurry enters the annular cavity 22 constructed in the turntable 12 through the circulation hole 21.

[0052] Among them, a number of sliding holes 23 evenly distributed in the circumferential direction are arranged on the turntable 12. The sliding holes 23 communicate with the annular cavity 22. The slurry in the annular cavity 22 will enter the spray pipe 24 arranged in the sliding hole 23, and then be sprayed out from the spray head 25 arranged at one end of the spray pipe 24. The spray pipe 24 rotates in the sliding hole 23 with the rotation of the turntable 12, and the spray pipe 24 and the spray head 25 rotate together.

[0053] The structure between the nozzle 25 and the spray pipe 24 is configured as a rotational connection. A rotating gear 26 is provided on the nozzle 25, and a toothed ring 27 meshing with the rotating gear 26 is provided on the support disk 1. When the turntable 12 drives the spray pipe 24 to rotate, the rotating gear 26 provided on the nozzle 25 will rotate through meshing with the toothed ring 27. The rotating gear 26 drives the nozzle 25 to rotate at one end of the spray pipe 24. That is, when the turntable 12 drives the spray pipe 24 and the nozzle 25 to rotate, the nozzle 25 will also rotate self - by meshing the rotating gear 26 with the toothed ring 27.

[0054] The double - rotation motion (revolution + self - rotation) enables the nozzle 25 to spray the slurry in a more complex manner, thus achieving a more uniform slurry spraying coverage. The slurry can be evenly sprayed onto various parts of the goaf to form a uniform fire - prevention layer. The nozzle 25 continuously changes its angle during the spraying process, capable of covering all corners of the goaf, including the coal seams and rock formations on both sides. The uniform slurry spraying coverage can more effectively isolate oxygen and heat, reducing the risk of coal spontaneous combustion. The self - rotation mechanism of the nozzle 25 helps to form a thicker fire - prevention layer, improving the fire - prevention and extinguishing effect.

[0055] In addition, one end of the spray pipe 24 is configured with a bent section 241, and the bending direction of the bent section 241 is away from the support disk 1. The nozzle 25 is rotatably arranged at one end of the bent section 241, and the bending angle enables the slurry to contact the rock formation at a certain angle.

[0056] The bending angle of the bent section 241 of the spray pipe 24 enables the slurry to contact the rock formation at a certain angle when leaving the nozzle 25, rather than being sprayed vertically. This effectively avoids the problem of uneven coverage caused by direct vertical spraying of the slurry. By optimizing the spraying angle and coverage uniformity, the design of the bending angle can reduce the waste of the slurry. The slurry can be more effectively attached to the target area, avoiding unnecessary material waste.

[0057] The spray pipe 24 is slidably arranged in the sliding hole 23. A connecting ring 28 is provided on the spray pipe 24, and a return spring 29 is arranged between the connecting ring 28 and the turntable 12. The return spring 29 will push the spray pipe 24 to extend outward through the connecting ring 28.

[0058] Refer to Figure 6 、 Figure 7 and Figure 8 As shown, the toothed ring 27 includes arc - shaped segments 271 corresponding one - to - one to the spray pipes 24. Adjacent arc - shaped segments 271 are movably connected. The deflection angle of the arc - shaped segment 271 corresponds to the bending angle of the bent section 241 of the spray pipe 24. Due to the existence of the bent section 241, the arc - shaped segment 271 also meshes with the rotating gear 26 at a relative angle. The arc - shaped segment 271 will abut against the rotating gear 26, making the return spring 29 in a compressed state.

[0059] An adjusting member 3 connected to the toothed ring 27 is provided on the support disc 1. By adjusting each arc segment 271 to move outward from the support disc 1, the return spring 29 will push the nozzle 24 to move outward together through the connecting ring 28, so as to change the distance that the nozzle 25 extends out, enabling the extension distance of the nozzle 25 to be adjusted according to actual needs, thereby changing the spraying coverage; by adjusting the position of each arc segment 271, fine adjustment of the extension distance of the nozzle 25 can be achieved. This flexibility enables the spraying device to adapt to different spraying requirements. For example, in a high roof or a wide goaf, the spraying coverage can be expanded by increasing the extension distance of the nozzle 25.

[0060] Referring Figure 9 、 Figure 10 and Figure 11 As shown, specifically, the adjusting member 3 includes connection grooves 31 provided on the support disc 1 corresponding to the nozzles 24 one by one. A connecting rod 32 is slidably arranged in the connection groove 31. The support disc 1 is provided with receiving grooves 34 corresponding to the connecting rods 32 one by one. A transmission gear 35 is rotatably arranged in the receiving groove 34.

[0061] By rotating the adjusting gear ring 36 rotatably arranged on the support disc 1, the adjusting gear ring 36 drives it to rotate through meshing with a number of transmission gears 35. The transmission gear 35 rotates in the receiving groove 34 and forces the connecting rod 32 to move outward from the support disc 1 through threaded connection with the connecting rod 32. At the same time, the connecting rod 32 will drive a connecting block 33 arranged after one end of the connecting rod 32 penetrates out of the support disc 1. The connecting block 33 drives the corresponding arc segment 271 to move together through connection.

[0062] When multiple arc segments 271 open outward, the compressed return spring 29 pushes the connecting ring 28, causing the nozzle 24 to drive the nozzle 25 to open outward together, so that the nozzle 25 is closer to the spraying position and the spraying distance is shortened. On the contrary, by rotating the adjusting gear ring 27 to force the transmission gear 35 to reverse, the transmission gear 35 will drive it to move into the connection groove 31 through threaded cooperation with the connecting rod 32. The multiple connecting rods 32 converge in the middle. At this time, the connecting block 33 will drive the arc segment 271 to move together. The arc segment 271 abuts against the transmission gear 35, causing the nozzle 24 to drive the connecting ring 28 to retract inward together and compress the return spring 29. The nozzle 24 will drive the nozzle 25 to increase the spraying distance.

[0063] By rotating the adjusting gear ring 36, the movement of the connecting rod 32 can be accurately controlled, thereby realizing accurate control of the position of the nozzle 25, adapting to different spraying requirements to improve the spraying uniformity and coverage effect. For example, under different goaf heights or widths, the spraying effect can be optimized by adjusting the position of the nozzle 25.

[0064] Looking back Figure 7 andFigure 8 As shown, when multiple arc segments 271 are opened, there will be gaps between adjacent arc segments 271, resulting in the nozzle 24 getting stuck in the gap under the influence of the return spring 29 during rotation. Therefore, an arc guide bar 41 is provided on one side of the arc segment 271, and an arc guide groove 42 is formed on the arc guide bar 41. A sliding guide bar 43 is slidably arranged in the arc guide grooves 42 of adjacent arc guide bars 41.

[0065] When multiple arc segments 271 move, the arc segments 271 will drive the arc guide bars 41 to move together. At this time, the sliding guide bar 43 will move in the arc guide groove 42, enabling multiple arc guide bars 41 to be connected by the sliding guide bar 43 to form a guiding ring 4. The movement of the connecting rod 32 will drive the guiding ring 4 to change its size through the arc segments 271.

[0066] When multiple arc segments 271 open outwards, the arc segments 271 will drive the arc guide bars 41 to move together. At this time, the sliding guide bar 43 will move in the arc guide groove 42, expanding the guiding ring 4; conversely, when multiple arc segments 271 contract inwards, the arc segments 271 will drive the arc guide bars 41 to move together. At this time, the sliding guide bar 43 will move in the arc guide groove 42, causing the guiding ring 4 to rotate. A guide wheel 44 is rotatably arranged on the guiding ring 4. The guide wheel 44 abuts against the guiding ring 4. During the process of the nozzle 24 driving the spray head 25 to rotate, the guide wheel 44 will rotate on the guiding ring 4 to guide the spray head 25 and the nozzle 24 through the gap formed by the outward opening of the arc segments 271. At this time, the rotating gear 26 will intermittently engage with the arc segments 271 and perform intermittent rotation.

[0067] Among them, a flame-retardant jetting member 5 is arranged on the connecting rod 32. The main function of the flame-retardant jetting member 5 is to spray flame-retardant gases, such as carbon dioxide (CO2), nitrogen (N2), etc. These gases can effectively inhibit the spontaneous combustion of coal and the spread of fire. Through the fire detection sensor, parameters such as the temperature and gas concentration in the goaf can be monitored in real time. When a fire hazard or fire is detected, the flame-retardant jetting member 5 can quickly spray fire extinguishing agents, such as dry powder fire extinguishing agents or chemical fire extinguishing agents, directly acting on the fire source to extinguish the fire.

[0068] Referring to Figure 10 、 Figure 11 and Figure 12 As shown, specifically, the flame-retardant jetting member 5 includes connection cavities 51 formed in the support disk 1 corresponding to a plurality of connection grooves 31 one by one, and connection through holes 52 are formed in the connecting rod 32.

[0069] Flame-retardant gas is conveyed into the connection cavities 51 through pipelines. The gas will enter the connection through holes 52 through the connection cavities 51 and then be ejected from the nozzles 6 arranged at one end of the connecting rod 32. At the same time, the nozzles 6 will move together with the opening and contraction of the connecting rod 32 to ensure consistent movement with the spray head 25.

[0070] The gas ejected will come into contact with the slurry, break up the ejected slurry, and the broken-up slurry forms finer droplets, which can more evenly cover the surface of the goaf, increasing the coverage area of the sprayed slurry. The finer slurry droplets are more likely to penetrate into the fissures of the coal seam and rock formation, enhancing the bonding force between the slurry and the coal and rock, and further improving the fire prevention and extinguishing effect.

[0071] Meanwhile, the ejected flame-retardant gas can also replace the air. Due to the density and diffusion characteristics of the flame-retardant gas, they will gradually displace the air in the goaf. Specifically, the flame-retardant gas will form a protective layer in the space, pushing out the original air (including oxygen). Through air replacement, the oxygen concentration in the goaf will be significantly reduced. Oxygen is a necessary condition for combustion, and reducing the oxygen concentration can effectively inhibit the combustion reaction, thus preventing the spread of fire.

[0072] Among them, the nozzle 6 includes an adapter tube 61 provided at the upper end of the connecting rod 32. The inside of the adapter tube 61 is communicated with the connecting through-hole 52. A rotating nozzle 62 is rotatably provided on the adapter tube 61. The rotating nozzle 62 is communicated with the inside of the connecting tube. A rotating shaft 63 connected to the rotating nozzle 62 is rotatably provided inside the adapter tube 61.

[0073] The gas passes through the connecting through-hole 52 and then enters the adapter tube 61, and then is ejected from the rotating nozzle 62. By driving the rotating shaft 63 to rotate through a motor, the rotating nozzle 62 is driven by the rotating shaft 63 to change the angle. The dynamic adjustment ability enables the nozzle 6 to adjust the spraying angle in real time according to the specific situation of the goaf, ensuring that the gas can effectively cover the target area.

[0074] By rotating the rotating nozzle 62, the spraying angle of the gas can be precisely controlled, realizing precise spraying on different parts of the goaf. This precise spraying helps to improve the fire prevention and extinguishing effect.

[0075] The implementation principle of the present invention is as follows:

[0076] (1): When spraying slurry on the goaf, the driving shaft 11 is driven to rotate by a motor, and the rotating driving shaft 11 will drive the turntable 12 to rotate synchronously. During the rotation of the turntable 12, the slurry is input into the flow-through hole 21 through a water pump, and the slurry enters the annular cavity 22 formed inside the turntable 12 through the flow-through hole 21.

[0077] (2): The nozzle 25 is rotatably connected to the spray pipe 24. A rotating gear 26 is provided on the nozzle 25, and a toothed ring 27 meshing with the rotating gear 26 is provided on the support disk 1. When the turntable 12 drives the spray pipe 24 to rotate, the rotating gear 26 provided on the nozzle 25 will rotate through meshing with the toothed ring 27. The rotating gear 26 drives the nozzle 25 to rotate at one end of the spray pipe 24. When the turntable 12 drives the spray pipe 24 and the nozzle 25 to rotate, the nozzle 25 will also rotate self by meshing of the rotating gear 26 and the toothed ring 27.

[0078] (3): By adjusting each arc segment 271 to move outward from the support disk 1, the reset spring 29 of the adjusting member 3 will push the spray pipe 24 to move outward together through the connecting ring 28, so as to change the protruding distance of the nozzle 25, so that the protruding distance of the nozzle 25 can be adjusted according to actual needs, and the spraying coverage range can be changed.

[0079] (4): By adjusting the rotation of the toothed ring 36, the movement of the connecting rod 32 can be accurately controlled, so as to realize the accurate control of the position of the nozzle 25, adapt to different spraying requirements to improve the spraying uniformity and coverage effect. For example, under different goaf heights or widths, the spraying effect can be optimized by adjusting the position of the nozzle 25.

[0080] (5): The nozzle 6 will move together with the opening and contraction of the connecting rod 32 to ensure consistent movement with the nozzle 25. The gas ejected will contact the slurry, break up the ejected slurry, and the broken slurry will form finer droplets, which can cover the surface of the goaf more evenly, increase the spraying coverage area. The finer slurry droplets are more likely to penetrate into the cracks of the coal seam and rock formation, enhance the bonding force between the slurry and the coal and rock, and further improve the fire prevention and extinguishing effect.

[0081] (6): At the same time, the ejected flame-retardant gas can also replace the air. Due to the density and diffusion characteristics of the flame-retardant gas, they will gradually displace the air in the goaf. Specifically, the flame-retardant gas will form a protective layer in the space, pushing out the original air (including oxygen). Through air replacement, the oxygen concentration in the goaf will be significantly reduced. Oxygen is a necessary condition for combustion. Reducing the oxygen concentration can effectively inhibit the combustion reaction and prevent the spread of fire.

[0082] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A spraying fire prevention and extinguishing device for a coal mine goaf, comprising a support plate (1), and a driving shaft (11) rotatably penetrating through the support plate (1), characterized in that: A turntable (12) is rotatably arranged on one side of the support disc (1), a driving shaft (11) penetrates through the turntable (12), and a slurry spraying device (2) is arranged on the turntable (12); The slurry spraying device (2) includes a flow hole (21) opened in the driving shaft (11), an annular cavity (22) is constructed in the turntable (12) and communicated with the flow hole (21), a plurality of sliding holes (23) are circumferentially and uniformly distributed on the turntable (12), the sliding holes (23) are communicated with the annular cavity (22), a spray pipe (24) is slidably arranged in the sliding holes (23), and a spray head (25) is arranged at one end of the spray pipe (24).

2. The grouting fire prevention and extinguishing device for goaf in coal mines according to claim 1, wherein: The slurry spraying device (2) further includes that the connection between the spray head (25) and the spray pipe (24) is constructed as a rotational connection, a rotating gear (26) is arranged on the spray head (25), and a toothed ring (27) meshing with the rotating gear (26) is arranged on the support disc (1); The spray pipe (24) is slidably arranged in the sliding hole (23), a connecting ring (28) is arranged on the spray pipe (24), and a return spring (29) is arranged between the connecting ring (28) and the turntable (12).

3. The gob grouting fire prevention and extinguishing device for coal mines according to claim 2, characterized in that: One end of the spray pipe (24) is constructed with a bent section (241), and the bending direction of the bent section (241) is away from the support disc (1), and the spray head (25) is rotatably arranged at one end of the bent section (241).

4. The shotcreting fire prevention and extinguishing device for goaf in coal mines according to claim 2, characterized in that: The toothed ring (27) includes arc-shaped sections (271) corresponding to the spray pipes (24) one by one, and adjacent two arc-shaped sections (271) are movably connected, and the angle of the arc-shaped section (271) corresponds to the bending angle of the bent section (241) of the spray pipe (24).

5. A coal mine goaf shotcrete fire prevention and extinguishing device according to claim 1, characterized in that: An adjusting member (3) connected to the toothed ring (27) is arranged on the support disc (1); The adjusting member (3) includes connection grooves (31) arranged on the support disc (1) corresponding to the spray pipes (24) one by one, a connecting rod (32) is slidably arranged in the connection grooves (31), one end of the connecting rod (32) penetrates through the support disc (1) and then a connection block (33) is arranged, and the connection block (33) is connected to the corresponding arc-shaped section (271).

6. The shotcreting fire prevention and extinguishing device for goaf in coal mines according to claim 5, characterized in that: Receiving grooves (34) corresponding to the connecting rods (32) one by one are opened on the support disc (1), and a transmission gear (35) threadedly connected to the connecting rod (32) is rotatably arranged in the receiving grooves (34); An adjusting gear ring (36) meshing with a plurality of transmission gears (35) is rotatably arranged on the support disc (1).

7. A coal mine gob area shotcreting fire prevention and extinguishing device according to claim 4, characterized in that: An arc-shaped guide bar (41) is arranged on one side of the arc-shaped section (271), an arc-shaped guide groove (42) is opened on the arc-shaped guide bar (41), and a sliding guide bar (43) is jointly slidably arranged in the arc-shaped guide grooves (42) of adjacent two arc-shaped guide bars (41).

8. An anti - fire spraying device for goaf in coal mines according to claim 7, characterized in that: A plurality of arc-shaped guide bars (41) are connected through the sliding guide bar (43) to form a guiding ring (4), and a guide wheel (44) abutted against the guiding ring (4) is arranged on the spray head (25).

9. A coal mine goaf spraying fire prevention and extinguishing device according to claim 5, characterized in that: A flame-retardant jetting member (5) is arranged on the connecting rod (32); The flame-retardant jetting member (5) includes connection cavities (51) constructed in the support disc (1) corresponding to a plurality of connection grooves (31) one by one, a connection through hole (52) is opened on the connecting rod (32), and a nozzle (6) is arranged at one end of the connecting rod (32).

10. A coal mine goaf shotcrete fire prevention and extinguishing device according to claim 9, characterized in that: The nozzle (6) includes an adapter tube (61) provided at the upper end of the connecting rod (32). The interior of the adapter tube (61) communicates with the connecting through-hole (52). A rotating nozzle (62) is rotatably provided on the adapter tube (61). The rotating nozzle (62) communicates with the interior of the connecting tube. A rotating shaft (63) connected to the rotating nozzle (62) is rotatably provided in the adapter tube (61).

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