Coal mine underground fire preventing and extinguishing device

Abstract

The invention discloses an underground coal mine fire preventing and extinguishing device, and belongs to the technical field of mine fire prevention. The underground coal mine fire preventing and extinguishing device comprises a support, an air duct is fixedly installed in the support, the side face of the air duct is communicated with an air inlet pipeline, and a rotation eliminating pipeline is installed at the inner top of the air duct; the high position of the side face of the air duct is communicated with one connector of a three-way flow dividing pipeline. Functional integration is achieved by arranging the assemblies, instantaneous dust collection and suppression actions are conducted on coal uncovering work and dust generated underground according to operation requirements, the dust concentration is reduced to be in the safety standard, the fireproof effect is achieved, and in addition, through the synergistic effect of the arranged fireproof fire extinguishing mechanism and the wind pressure adjusting system, the fire extinguishing effect is improved. When the dust suppression action is executed, if a fire occurs, the action can be quickly switched to the fire extinguishing action, and the response time can be shortened to be within 2 seconds, so that the instantaneous fire extinguishing effect is achieved, quick response measures are provided for dealing with the occurrence of the fire underground, and a guarantee is provided for underground operation safety.

Description

Technical Field

[0001] This invention relates to the field of mine fire prevention technology, specifically to a coal mine underground fire prevention and extinguishing device. Background Technology

[0002] Coal uncovering refers to the process of separating coal seams from rock strata. This process involves the instantaneous release of gas pressure and the immediate upheaval of coal dust, making it one of the most dangerous procedures underground. Therefore, coal uncovering operations are subject to strict operational procedures and regulations.

[0003] Therefore, to prevent underground explosions, wet dust collectors combined with foam dust suppressors must be used during coal uncovering operations to instantly reduce the density of dust underground and ensure operational safety. However, during underground operations, it is necessary to assume that a fire may break out at any time, and therefore, a fire extinguishing system must be provided.

[0004] During coal mining operations, there are three common fire extinguishing systems for the coal face: a handheld expansion hose with high-pressure hose, quick-connect fitting, and multi-functional valve for direct water injection (grouting) fire extinguishing; a mobile underground rubber wheel or skid for "gel / three-phase foam injection" fire extinguishing; and a mobile mine-use "liquid CO2 or N2 direct vaporization fire extinguishing" device.

[0005] Of the three methods mentioned above, the mobile three-phase foam / gel device requires 8-10 seconds to spray stable foam through the foam gun after the equipment is started, while the liquid CO2 (or N2) vaporization direct injection requires 5-7 seconds for the gas to reach the nozzle and be sprayed after the equipment is started. It can be seen that even if the fire extinguishing system responds instantly, the fire may expand rapidly within the above time, leading to a serious production safety accident. Summary of the Invention

[0006] The purpose of this invention is to provide a fire prevention and extinguishing device for underground coal mines to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a fire prevention and extinguishing device for underground coal mines, comprising a support frame, an air duct fixedly installed inside the support frame, an air inlet pipe connected to the side of the air duct, an anti-swirl pipe installed at the top inner side of the air duct, one interface of a three-way diversion pipe connected to the side of the air duct, the other interface of the three-way diversion pipe connected to the input end of an integrated silo via a pipe, a raw material tank connected to the side of the integrated silo via a pipe, a water tank connected to the bottom of the integrated silo via a pipe, the bottom end of the water tank connected to the input end of an electric conveying pump via a pipe, a fire prevention and extinguishing mechanism installed at the input end of the electric conveying pump, and an ash storage box installed at the bottom inner side of the support frame.

[0008] Preferably, the fire prevention and extinguishing mechanism includes a thickening chamber, which is connected to the output end of an electric delivery pump. The inner top of the thickening chamber is connected to a thickening tank via a mining gear metering pump. A Venturi throat is connected to the side of the thickening chamber, and one end of the Venturi throat is connected to an air-cutting chamber. An air-cutting arc plate is hinged to the inner wall of the air-cutting chamber. An electric diversion valve is connected to the side of the air-cutting chamber via a pipe. One output end of the electric diversion valve is connected to a buffer chamber. A wind pressure adjustment system is provided on the side of the Venturi throat.

[0009] Preferably, the air pressure adjustment system includes an air inlet pipe, one end of which is connected to an electric three-way reversing valve, one output end of which is connected to a first air outlet pipe, and the other output end of which is connected to a second air outlet pipe. The output ends of the first and second air outlet pipes extend tangentially into the interior of the Venturi throat.

[0010] Preferably, the inner diameter of the air inlet pipe is the same as the inner diameter of the first air outlet pipe, and the inner diameter of the second air outlet pipe is 1.1 times the inner diameter of the air inlet pipe.

[0011] Preferably, a motor with its output end extending into the air cutting chamber and connected to the air cutting arc plate is installed on the side of the air cutting chamber.

[0012] Preferably, there are two wind-cutting arc plates, and the two wind-cutting arc plates are symmetrically arranged inside the wind-cutting chamber. The arc surfaces of the two wind-cutting arc plates are provided with multiple openings with a tangential angle of 30 degrees. The inner side of the wind-cutting chamber is provided with a groove that matches the wind-cutting arc plate.

[0013] Preferably, the first and second air outlet pipes are positioned close to the input end of the Venturi throat at their entry points, with an entry angle of 30 degrees.

[0014] Preferably, the integrated chamber is equipped with a T-shaped pipe, a mining gear metering pump, and a mining peristaltic pump. The mining gear metering pump connects the raw material tank to one interface of the T-shaped pipe. The remaining two interfaces of the T-shaped pipe are connected to the interface of the T-shaped diversion pipe and the input end of the mining peristaltic pump, respectively. The output end of the mining peristaltic pump is connected to a pipe at the bottom of the integrated chamber that connects to the water tank.

[0015] Preferably, the top end of the anti-swirl pipe extends to the outside of the air duct, and an anti-swirl plate is installed inside the anti-swirl pipe, with multiple openings having a tangential angle of thirty degrees inside the anti-swirl plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting up components to realize a combination of fire prevention and extinguishing functions, it can realize the instantaneous dust suction and suppression action of coal uncovering work and dust generated underground according to the needs of operation, reduce the dust concentration to the safety standard, and achieve the effect of fire prevention. In addition, through the coordinated action of the set fire prevention and extinguishing mechanism and the wind pressure adjustment system, if a fire is encountered while the dust suppression action is being performed, it can quickly switch to the fire extinguishing action. Through the synchronous assistance of the set components, the response time can be shortened to less than 2 seconds, thereby achieving the effect of instantaneous fire extinguishing. Before the underground fire extinguishing is initiated, it provides a faster response measure for dealing with fire underground, and provides a guarantee for the safety of underground operations. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the structure at point A in the middle; Figure 3 This is a front view schematic diagram of the structure of the present invention; Figure 4 This is a rear view schematic diagram of the structure of the present invention; Figure 5 This is a side view of the structure of the present invention; Figure 6 This is a side view of the structure of the present invention; Figure 7 This is a top view of the structure of the present invention; Figure 8 This is a schematic diagram of the internal structure of the thickening chamber, Venturi throat, and air-cutting chamber of the present invention. Figure 9 This is a schematic diagram of the wind-cutting arc plate structure of the present invention.

[0018] In the diagram: 1. Support frame; 2. Air duct; 3. Air inlet duct; 4. Anti-swirl duct; 5. T-junction diversion duct; 6. Integrated compartment; 7. Raw material tank; 8. Water tank; 9. Electric transfer pump; 10. Ash storage box; 11. Thickening compartment; 12. Thickening tank; 13. Venturi throat; 14. Air cutting compartment; 15. Air cutting arc plate; 16. Buffer compartment; 17. Air inlet duct; 18. Electric T-junction reversing valve; 19. First air outlet duct; 20. Second air outlet duct; 21. Electric diversion valve. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] Please see Figure 1-9 This invention provides a technical solution: a coal mine underground fire prevention and extinguishing device, including a support 1, with a ventilation duct 2 fixedly installed inside the support 1. An air inlet pipe 3 is connected to the side of the ventilation duct 2, tangentially connecting to the side of the ventilation duct 2 to draw dust raised during coal uncovering into the ventilation duct. A deswirl-eliminating pipe 4 is installed at the top inner interior of the ventilation duct 2. An explosion-proof cavity with a wall thickness of not less than 8mm is installed outside the deswirl-eliminating pipe 4. The top of the deswirl-eliminating pipe 4 extends to the outside of the ventilation duct 2, and a deswirl-eliminating plate is installed inside it. The deswirl-eliminating plate has multiple openings with a tangential angle of 30 degrees, with no fewer than 160 openings and a diameter of not less than 0.4mm. When dust is drawn into the ventilation duct by external negative pressure airflow, it forms a cyclone and comes into contact with water mist. Subsequently, as it passes through the deswirl-eliminating pipe 4, the deswirl-eliminating plate effectively eliminates the rotation of the dust, allowing the dust to be discharged from the ventilation duct 2 in a relatively stable state and flow to subsequent pipelines, thereby eliminating cyclone residue and reducing the risk of fire.

[0023] A three-way diversion pipe 5 is connected to the upper side of the ventilation duct 2, serving as both a diversion and connection point. Another interface of the three-way diversion pipe 5 is connected to the input end of the integrated chamber 6 via a pipe. In total, the three-way diversion pipe 5 has three interfaces: two connect to the integrated chamber 6 and the ventilation duct 2, and the remaining interface is used to connect to an external water source to meet the water requirements for wet dust removal and foam liquid. Therefore, a spray pipe with an electric shut-off valve is installed inside the ventilation duct 2, connected to the interface of the three-way diversion pipe 5. The side of the integrated chamber 6 is connected to the raw material tank 7 via a pipe.

[0024] The raw material tank 7 stores the foaming agent raw material used to generate foam. A liquid injection pipe is connected to the side of the raw material tank 7. Inside the integrated chamber 6, a T-shaped pipe, a mining gear metering pump, and a mining peristaltic pump are installed. The metering pump connects the raw material in the raw material tank 7 to one interface of the T-shaped pipe. The bottom of the integrated chamber 6 is connected to a water tank 8 via a pipe. The remaining two ports of the T-shaped pipe are connected to the ports of the T-shaped diversion pipe 5 and the input port of the peristaltic pump, respectively. The output port of the mining peristaltic pump is connected to the pipe at the bottom of the integrated silo 6 that connects to the water tank 8. Thus, the foaming agent concentrate in the concentrate tank 7 is precisely metered and output to the T-shaped pipe through the metering pump. Clean water is also precisely metered and output to the T-shaped pipe through the peristaltic pump, and the clean water and concentrate enter the water tank 8 along with the water flow. Since the mass ratio of concentrate needs to be changed when performing different actions, the dust suppression is 0.5% (0.5g concentrate / 100g total liquid mass), and the fire extinguishing is 3% (3g concentrate / 100g total liquid mass). Therefore, the concentrate delivery flow rate is 25g / min or 150g / min, and the clean water delivery flow rate is 5kg / min or 30kg / min.

[0025] The bottom of the water tank 8 is connected to the input end of the electric conveying pump 9 via a pipe. The input end of the electric conveying pump 9 is equipped with a fire-extinguishing mechanism. In addition, an ash storage box 10 is installed at the bottom inner side of the bracket 1. The ash storage box 10 is connected to the ventilation duct 2 via a pipe and an electric shut-off valve. The ash storage box 10 is used to store dusty wastewater. Therefore, a discharge pipe is connected to the side of the ash storage box 10 for centralized collection and subsequent periodic discharge treatment.

[0026] The fire extinguishing mechanism includes a thickening chamber 11, which is connected to the output of an electric delivery pump 9. When the electric delivery pump 9 delivers water, the top of the thickening chamber 11 is connected to a thickening tank 12 via a mining gear metering pump. The thickening tank 12 is filled with thickening slurry, the main component of which is xanthan gum powder. It is added only to the foam mixture in the water tank 8 when used for fire extinguishing. The metering pump precisely controls the amount of thickener added to ensure the stability and accuracy of the thickening effect. The thickening slurry is added at a mass ratio of 0.5%. The thickening chamber 11 is connected to a Venturi throat 13 on its side. The Venturi throat 13 is a special pipe structure with a variable cross-section flow channel that first contracts and then expands. Through its geometric shape, it efficiently converts pressure energy into kinetic energy and then back into pressure energy. By utilizing the speed and pressure changes of the fluid flowing in the pipe, combined with the openings on the wind shear plate, it achieves the cutting and foaming of the foam mixture, allowing the foam volume to expand to meet the standard of the scheme (600-900 times for dust suppression, and no less than 1000 times for fire extinguishing). At the same time, the Venturi throat also has the characteristics of high mixing efficiency. The foam mixture and the thickening slurry can achieve 95% uniformity in a contact time of only 10-20ms, without the need for an additional stirrer. It achieves "electric injection without electricity, high-efficiency mixing, and instant start-up and stop" through a single pipe, which meets the requirements of underground explosion protection and second-level response.

[0027] One end of the Venturi throat 13 is connected to the air-cutting chamber 14. Two air-cutting arc plates 15 are hinged to the inner wall of the air-cutting chamber 14, symmetrically arranged inside the chamber. Each air-cutting arc plate 15 has multiple openings with a tangential angle of 30 degrees on its arc surface. The tangential angle is designed to cut the foam mixture, allowing the foam volume to expand. Depending on the action performed, the number and diameter of the openings on the two air-cutting arc plates 15 differ, with 120 and 160 openings respectively. The smaller number of openings results in a diameter of 0.3 mm, while the larger number results in a diameter of 0.4 mm. The difference in the number of openings is due to the different foam volumes required for dust suppression and fire extinguishing. A 0.3mm opening with 120 openings can increase the foam volume by 600-900 times, while a 0.4mm opening with 160 openings can increase the foam volume by more than 1000 times, allowing the sprayed foam to meet the requirements for dust suppression or fire extinguishing. The inner side of the wind-cutting chamber 14 is provided with a groove that matches the wind-cutting arc plate 15. The groove is designed to hide the unused wind-cutting arc plate 15, which is used when the foam mixture is cut through the opening.

[0028] When performing dust suppression, the wind shear plate 15 with 120 openings is lowered, and when performing fire extinguishing, the wind shear plate 15 with 160 openings is lowered.

[0029] An electric diversion valve 21 is connected to the side of the air-cutting chamber 14 via a pipe. One output end of the electric diversion valve 21 is connected to a buffer chamber 16. The function of the buffer chamber 16, in conjunction with the electric diversion valve 21, is to temporarily store foam in the pipe that does not meet the required volume for the action during the switching process. The other output end of the electric diversion valve 21 is connected to a pipe for installing the nozzle. A wind pressure adjustment system is installed on the side of the venturi throat 13.

[0030] Example 1 A wind pressure adjustment system is provided on the side of the Venturi throat 13. The wind pressure adjustment system includes an air inlet pipe 17. One end of the air inlet pipe 17 is connected to an electric three-way reversing valve 18. One output end of the electric three-way reversing valve 18 is connected to a first air outlet pipe 19. The output end of the first air outlet pipe 19 extends tangentially into the interior of the Venturi throat 13. The inner diameter of the air inlet pipe 17 is the same as the inner diameter of the first air outlet pipe 19. The first air outlet pipe 19 is located close to the input end of the Venturi throat 13 at the point of entry into the Venturi throat 13, and the entry angle is thirty degrees. When implementing the fire extinguishing plan, a separate pipe is connected to the air inlet duct 17, through which 0.5 MPa pressurized gas is introduced. The flow path is switched via an electric three-way reversing valve 18. The pressurized gas acts on the foam mixture in the Venturi throat 13, propelling the foam mixture to the nozzle. Due to the 0.5 MPa pressurized gas, the sprayed extinguishing foam can cover a range of 2 meters from the nozzle towards the fire. It also ensures that the foam mixture, after passing through the wind shear plate, can expand in volume by more than 1000 times. Simultaneously, the foam mixture enters the Venturi throat 13... Before the Venturi throat 13, the slurry in the thickening tank 12 is fed into the foam mixture at a ratio of 0.5% by a metering pump. At the same time, the foaming agent in the original liquid tank 7 is adjusted by the metering pump to increase the ratio from 0.5% to no less than 3%. When the foam mixture containing the slurry passes through the Venturi throat 13, the arc plate with a 0.4mm opening diameter in the wind-cutting arc plate 15 is lowered. The foam mixture is cut by the wind-cutting arc plate 15, realizing the mixing of the slurry and the foam mixture, as well as foaming.

[0031] Example 2 A wind pressure adjustment system is provided on the side of the Venturi throat 13. The wind pressure adjustment system includes an air inlet pipe 17. One end of the air inlet pipe 17 is connected to an electric three-way reversing valve 18. One output end of the electric three-way reversing valve 18 is connected to a second air outlet pipe 20. The output end of the second air outlet pipe 20 extends tangentially into the interior of the Venturi throat 13. The inner diameter of the second air outlet pipe 20 is 1.1 times the inner diameter of the air inlet pipe 17. The entry point of the second air outlet pipe 20 into the Venturi throat 13 is close to the input end of the Venturi throat 13 and the entry angle is thirty degrees. When the dust suppression scheme is implemented, the 0.5 MPa pressurized airflow entering the inlet duct 17 is switched through the electric three-way reversing valve 18, allowing the pressurized airflow to enter the second outlet duct 20. Since the inner diameter of the second outlet duct 20 is 1.1 times that of the inlet duct 17, the air pressure in the second outlet duct 20 is reduced to 0.4 MPa. At the same time, when the foam mixture flows, the slurry stored in the thickening tank 12 will not be added. When the foam mixture passes through the Venturi throat 13, the arc plate with 120 openings in the wind shearing arc plate 15 is lowered to cut and foam the foam mixture, which will expand the foam volume to 600-900 times. This, in conjunction with the dust suction action of the components set on the air duct 2, will carry out dust removal and dust suppression.

[0032] Furthermore, all the electrical equipment mentioned above uses intrinsically safe circuits, and the voltage and current of the intrinsically safe circuits can meet the normal operation of the electrical equipment to meet the explosion-proof requirements in the mine. Moreover, through the synchronous instantaneous response of the electrical equipment, the rapid switching between different actions of dust suppression and fire extinguishing can be achieved, providing rapid response measures.

[0033] Working principle: During coal uncovering operations, the device is placed in the designated location underground, and the positions of the suction hood and nozzles are determined. During dust collection and suppression operations, the incoming water is divided through the three-way diversion pipe 5. One stream of water flows into the air duct 2 as spray water, and the other stream flows into the water tank 8 to prepare the foam mixture. The foaming agent concentrate in the concentrate tank 7 is sent into the water tank 8 by a metering pump along with the water flow, and the foam mixture is sent to the Venturi throat 13 by an electric transfer pump 9. At the same time, the arc plate with 120 openings in the wind-cutting arc plate 15 is lowered, and the air inlet pipe 17 is also simultaneously supplied with a 0.5 MPa pressurized airflow. The pressurized airflow is switched to the second air outlet pipe 20 by a three-phase reversing valve. Due to the change in pipe diameter, the pressure of the pressurized airflow is reduced to 0.4 MPa. The 0.4 MPa pressurized airflow blows out the foam mixture, which is then cut and foamed by the wind-cutting arc plate 15 and sprayed out from the nozzle, thus achieving the dust suppression action.

[0034] If a fire occurs during coal uncovering, the foaming agent in the foam mixture is increased to 3% by a metering pump. While maintaining the delivery, the thickening slurry filled in the thickening tank 12 is added to the foam mixture. The 0.5 MPa pressurized gas is introduced and the flow path is switched by the electric three-way reversing valve 18, so that the pressurized gas passes through the first air outlet pipe 19 without changing the inner diameter of the first air outlet pipe 19, thereby maintaining a gas pressure of 0.5 MPa to meet the fire extinguishing requirements. The wind shearing arc plate 15 is switched to an arc plate with 160 openings. The foam mixture with thickening slurry is cut and foamed by the arc plate and sent to the nozzle for spraying under the action of pressurized gas to achieve the fire extinguishing action.

[0035] While switching between dust suppression and fire extinguishing actions, the foam from the previous action will switch its flow path under the action of the electric diversion valve 21 and send the foam that does not meet the volume requirements of the action to the buffer chamber 16 for temporary storage.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fire extinguishing and preventing device for underground coal mine, comprising a support (1), characterized in that: The inside of the support (1) is fixedly provided with a wind cylinder (2), the side of the wind cylinder (2) is communicated with an air inlet pipeline (3), the inner top of the wind cylinder (2) is provided with a despinning pipeline (4), one interface of a three-way shunt pipeline (5) is communicated with the high side of the wind cylinder (2), the other interface of the three-way shunt pipeline (5) is communicated with the input end of an integrated bin (6) through a pipeline, the side of the integrated bin (6) is communicated with a raw liquid tank (7) through a pipeline, the bottom of the integrated bin (6) is communicated with a water tank (8) through a pipeline, the bottom end of the water tank (8) is communicated with the input end of an electric delivery pump (9) through a pipeline, the input end of the electric delivery pump (9) is provided with a fire extinguishing mechanism, and the inner bottom of the support (1) is provided with an ash storage tank (10).

2. The fire preventing and extinguishing device for underground coal mine according to claim 1, characterized in that: The fire extinguishing mechanism comprises a thickening bin (11), the thickening bin (11) is communicated with the output end of the electric delivery pump (9), the inner top of the thickening bin (11) is communicated with a thickening tank (12) through a mine gear metering pump, the side of the thickening bin (11) is communicated with a Venturi throat (13), one end of the Venturi throat (13) is communicated with a wind cutting bin (14), the inner wall of the wind cutting bin (14) is hinged with a wind cutting arc plate (15), the side of the wind cutting bin (14) is communicated with an electric shunt valve (21) through a pipeline, one output end of the electric shunt valve (21) is communicated with a buffer bin (16), and the side of the Venturi throat (13) is provided with a wind pressure adjusting system.

3. The fire extinguishing and preventing device for underground coal mine according to claim 2, characterized in that: The wind pressure adjusting system comprises an air inlet pipe (17), one end of the air inlet pipe (17) is communicated with an electric three-way reversing valve (18), one output end of the electric three-way reversing valve (18) is communicated with a first air outlet pipe (19), the other output end of the electric three-way reversing valve (18) is communicated with a second air outlet pipe (20), and the output ends of the first air outlet pipe (19) and the second air outlet pipe (20) extend to the inside of the Venturi throat (13) in a tangential direction.

4. The fire preventing and extinguishing device for underground coal mine according to claim 3, characterized in that: The inner diameter of the air inlet pipe (17) is the same as that of the first air outlet pipe (19), and the inner diameter of the second air outlet pipe (20) is 1.1 times that of the air inlet pipe (17).

5. The fire extinguishing and preventing device for underground coal mine of claim 2, wherein: The wind cutting bin (14) is provided with a motor whose output end extends to the inside of the wind cutting bin (14) and is connected with the wind cutting arc plate (15).

6. The fire preventing and extinguishing device for underground coal mine according to claim 2, characterized in that: The wind cutting bin (14) is provided with a motor whose output end extends to the inside of the wind cutting bin (14) and is connected with the wind cutting arc plate (15).

7. The fire extinguishing and preventing device for underground coal mine according to claim 3, characterized in that: The first air outlet pipe (19) and the second air outlet pipe (20) are close to the input end of the Venturi throat (13) at the cutting point position of the Venturi throat (13) and have a cutting angle of thirty degrees.

8. The fire extinguishing and preventing device for underground coal mine according to claim 1, characterized in that: The inside of the integrated bin (6) is provided with a three-way T-shaped pipe, a mining gear metering pump and a mining peristaltic pump, the mining gear metering pump is connected with one interface of the three-way T-shaped pipe in communication, the remaining two interfaces of the three-way T-shaped pipe are connected with the interface of the three-way shunt pipe (5) and the input end of the mining peristaltic pump in communication respectively, and the output end of the mining peristaltic pump is connected with the pipeline, which is in communication between the bottom of the integrated bin (6) and the water tank (8).

9. The fire extinguishing and preventing device for underground coal mine of claim 1, wherein: The top end of the despinning pipeline (4) extends to the outside of the air duct (2), and the inside of the despinning pipeline (4) is provided with a despinning plate, and a plurality of openings with a tangential angle of thirty degrees are formed in the inside of the despinning plate.

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