A spark-proof foam spraying process equipment and method for face support moving

Abstract

The present invention discloses a process equipment and method for spraying fire-preventing foam during the movement of hydraulic supports in a working face, belonging to the technical field of coal seam water injection and fire prevention and extinguishing. The fire-preventing foam spraying equipment for the movement of hydraulic supports in a working face includes an underground flame detection system, a foam production system, a foam automatic spraying system, and a self-moving system. The method for spraying fire-preventing foam during the movement of hydraulic supports in a working face of the present invention applies the fire-preventing foam spraying equipment of the present invention. Through the treatment of the foam production system, an appropriate amount of foam is synthesized. When sparks or smoke are generated by friction during the movement of the hydraulic support, signals are transmitted from the flame sensor or smoke sensor in the flame detection system to the foam production system and the foam automatic spraying system. During the movement of the hydraulic support, the infrared distance sensor on the self-moving system is used to track its moving direction and distance in real time to extinguish the sparks or smoke, ultimately preventing the occurrence of underground working face fire accidents.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal seam water injection and fire prevention and extinguishing, and particularly relates to a foam spraying process equipment and method for preventing sparks during the movement of a working face support. Background Art

[0002] Coal is the main energy source in China and occupies a very important position in the national economic energy structure. While the raw coal output is increasing rapidly, it is necessary to ensure the safe and efficient mining of coal mines. Mine fires are one of the main natural disasters in coal mines. All along, fire prevention and extinguishing have been the key points in the "one ventilation and three preventions" work of coal mines. At the same time, mine fires are also one of the traditional five major disasters, which are likely to cause secondary accidents such as gas and coal dust explosions. When a coal mine fire occurs, it will not only cause damage to facilities and equipment, but also result in waste of resources and difficulties in production succession, seriously threatening the lives of underground workers. And during the movement of the hydraulic support, sparks are generated due to the friction between the roof and the support, which can cause underground gas explosions and is also one of the reasons for mine fire accidents. Conventional foam extinguishing agents are aqueous film-forming foam extinguishing agents, mainly based on fluorocarbon surfactants and hydrocarbon surfactants. When extinguishing fires, they will form a water film on the surface of the combustibles and rely on the combined action of the water film and foam to extinguish the fire. Therefore, aqueous film-forming foam extinguishing agents extinguish fires quickly and have strong fire resistance. However, fluorocarbon surfactants have stable chemical properties and are difficult to degrade in the environment, which will cause environmental pollution. In recent years, environmentally friendly extinguishing agents have become a research hotspot. In addition, traditional fire extinguishing systems cannot move in real time following the movement of the hydraulic support, and once sparks are generated, they cannot be extinguished in time. Therefore, in the field of coal seam fire prevention and extinguishing, there is an urgent need for a new type of spark-proof and efficiency-enhancing technology to solve the two problems of real-time tracking and difficult degradation of foam production, in line with the purpose of building a green and energy-saving mine environment and being conducive to the long-term development of the coal mining industry. Summary of the Invention

[0003] The purpose of the present invention is to provide a foam spraying process equipment and method for preventing sparks during the movement of a working face support to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions: A foam spraying process equipment and method for preventing sparks during the movement of a working face support, including an underground flame detection system, a foam production system, a foam automatic spraying system, and a self-moving system;

[0005] The above-mentioned underground flame detection system includes a flame sensor, a smoke sensor, a voice and light alarm, and a power supply;

[0006] The above-mentioned foam production system includes a partitioned storage chamber, a foaming and filling device, a carbon dioxide cylinder, a carbon dioxide transportation pipeline, a foam pump motor, a foaming pressure gauge, a water supply valve, and a water storage tank;

[0007] The above self - moving system includes an infrared distance sensor, a mobile trolley, an automatic lift, and a hydraulic support frame;

[0008] The above automatic spraying system includes a second pressure gauge, a foam nozzle, a foam - conveying flow - control pipeline, and a speed - regulating valve;

[0009] Preferably, the above - mentioned partitioned storage chamber is equally divided into two small chambers in the whole chamber, and a foaming agent - SDS and a foam - stabilizing agent - xanthan gum are respectively installed in the two small chambers.

[0010] Preferably, the above - mentioned flame sensor is a dual - wavelength (purple and infrared) flame sensor. The sensor has a narrow - band filtering function, operates at a central - frequency wavelength of 4.4 μm, and performs integral operations through a high - performance microprocessor and an advanced mathematical algorithm model. Only the radiation spectrum that conforms to the flame characteristics will be recognized as a flame signal, while the false flame signals formed by other interference factors will be excluded. The response speed and sensitivity meet the millisecond - level requirements.

[0011] Preferably, the above - mentioned flame sensor and smoke sensor are located on the top of the automatic lift.

[0012] Preferably, the above - mentioned voice - light - sound alarm and evacuation indicator are located at the upper - right position on the side wall of the automatic lift; the above - mentioned infrared distance sensor is located on the left side of the side wall of the automatic lift, directly facing the hydraulic support frame; the above - mentioned foaming pressure gauge is located above the outer wall of the foaming filling device.

[0013] Preferably, a first pressure gauge is connected to the gas valve of the above - mentioned carbon dioxide cylinder.

[0014] Preferably, the above - mentioned foaming filling device can store substances from the partitioned storage chamber and the carbon dioxide cylinder, and after adding water, it can automatically stir and mix through the stirring device of the foaming filling device to produce a large amount of foam.

[0015] Preferably, the above - mentioned foam - stabilizing agent is xanthan gum, which has good foam - stabilizing effect and good anti - burning effect and is widely used; the above - mentioned foaming agent is SDS, which has a lower viscosity and better spreading property; the two are compounded according to a mass fraction of 3% each, and the spreading performance and foam - stabilizing performance of the obtained foam reach the best;

[0016] A process method for spraying fire - preventing foam during face support moving, applying the above - mentioned process equipment for spraying fire - preventing foam during face support moving;

[0017] The above method includes the following steps:

[0018] S1. Turn on the power to start the whole system;

[0019] S01. The partition storage chamber in the foam output system and the gas valve of the carbon dioxide cylinder are opened, and the carbon dioxide enters the foaming and filling device through the transportation pipeline. The water supply valve of the water storage tank is opened, and water enters the foaming and filling device through the transportation pipeline and is fully stirred and mixed to produce a large amount of foam. During the process of producing foam, the pressure in the foaming and filling device can be detected in real time according to the foaming pressure gauge. When there is a spark or smoke, the flame sensor or smoke sensor is triggered, and the voice and light alarm emits an alarm and flashes. The foam output system and the automatic foam spraying system are connected through the transmission cable.

[0020] S02. The produced foam is transported to the automatic foam spraying system through the pipeline, and the infrared distance sensor on the self-moving system tracks the moving position of the hydraulic support frame in real time and automatically follows it. The foam is sprayed to the place where the spark occurs through the foam nozzles inside the automatic foam spraying system.

[0021] S2. When the voice and light alarm emits an alarm and flashes, it means that the flame sensor or smoke sensor has detected a spark or smoke.

[0022] S3. When the pressure gauge reading on the outer wall of the foaming and filling device starts to rise from 0 MPa, it means that the foaming agent - SDS, the foam stabilizer - xanthan gum, carbon dioxide, and water start to mix and enter the foam generation stage. When the first pressure gauge reading at the gas valve of the carbon dioxide cylinder starts to drop from 6 - 8 MPa, it means that carbon dioxide is being transported to the foaming and filling device through the pipeline. When the pressure gauge reading of the carbon dioxide cylinder is less than 0.7 MPa, the cylinder needs to be replaced.

[0023] S4. As the reading on the foaming pressure gauge continues to rise until it slightly fluctuates within a range not exceeding 0.1 MPa, it means that the foam output is completed.

[0024] S5. Then, when the hydraulic support frame starts to move, the infrared distance sensor on the forearm of the automatic elevator lights up, and the moving trolley follows the hydraulic support frame to move, which means that the automatic tracking stage has entered.

[0025] S6. When the voice and light alarm emits an alarm and flashes, it means that the flame sensor or smoke sensor has detected a spark or smoke, and the automatic foam spraying stage has entered.

[0026] S7. A large amount of foam is transported to the top of the automatic elevator through the transportation pipeline and is sprayed to the roof where the spark or smoke occurs through the foam nozzles at the top to extinguish the spark or smoke and complete the process of preventing sparks.

[0027] S8. Frequently observe the reading of the foam pressure gauge on the outer wall of the foam filling device. If it drops to near 0 MPa, it indicates that the foam in the foam filling device has been exhausted. At this time, stop the movement of the hydraulic support frame, restart the automatic foam production system, and when reaching stage S4, the hydraulic support frame can be moved again.

[0028] The technical effects and advantages of the working face support moving fire - spark - preventing foam spraying process equipment and method: For the working face support moving fire - spark - preventing foam spraying method of the present invention, when applying the working face support moving fire - spark - preventing foam spraying equipment of the present invention, the whole system is started when the hydraulic support frame begins to move. Appropriate amount of foam is synthesized through the treatment of the foam production system. When sparks or smoke are generated by friction during the movement, signals are transmitted from the flame sensor or smoke sensor in the flame detection system to the foam production system and the automatic foam spraying system. During the movement of the hydraulic support frame, the infrared distance sensor on the self - moving system is used to track its moving direction and distance in real - time to extinguish the sparks or smoke, ultimately preventing the occurrence of underground working face fire accidents. During the whole fire - spark - preventing process, the flame sensor and smoke sensor of the flame detection system cooperate with the foam production system, and the automatic spraying of foam is realized by the self - moving system tracking the moving direction of the hydraulic support frame in real - time. The technological process is streamlined, the underground working environment is protected, energy consumption is reduced, and cost input is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0030] Figure 2 For the present invention Figure 1 A sectional view taken along line A - A of the embodiment in the present invention;

[0031] Figure 3 For the present invention Figure 2 An enlarged view of the embodiment at position B in the present invention.

[0032] In the figure: 1. Moving trolley; 2. Foam nozzle; 3. Flame sensor; 4. Smoke sensor; 7. Voice and light alarm; 9. Infrared distance sensor; 10. Automatic elevator; 11. Foam - conveying pump motor; 12. Power supply; 13. Foam filling device; 14. Water - conveying valve; 15. Water storage tank; 16. Separate storage chamber; 17. Carbon dioxide cylinder; 20. Gas valve; 21. First pressure gauge. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0034] Please refer to as Figures 1 - 3A kind of working face support fire prevention foam spraying process equipment and method as shown, including an underground flame detection system, a foam production system, a foam automatic spraying system and a self-moving system;

[0035] The underground flame detection system includes a flame sensor 3, a smoke sensor 4, and a voice and light alarm 7, all of which are located on the automatic elevator 10; among them, the flame sensor 3 and the smoke sensor 4 are located on the top of the automatic elevator 10, and the voice and light alarm 7 is located on the upper part of the outer side of the side wall of the automatic elevator 10. The flame sensor 3 uses a dual purple and infrared flame sensor, which has a narrowband filtering function and works at the center frequency wavelength of 4.4 μm. Through a high-performance microprocessor and an advanced mathematical algorithm model for integral operation, only the radiation spectrum that conforms to the flame characteristics will be recognized as a flame signal, while the false flame signals formed by other interference factors will be excluded. The response speed and sensitivity meet the millisecond-level requirements;

[0036] The foam production system includes a partitioned storage chamber 16, a foaming and filling device 13, a carbon dioxide cylinder 17, a carbon dioxide transportation pipeline, a foam pump motor 11, a foaming pressure gauge, a water supply valve 14, and a water storage tank 15. The partitioned storage chamber 16 is equally divided into two small chambers in the whole chamber. The two small chambers are respectively filled with a foaming agent - SDS and a foam stabilizer - xanthan gum. The selected foam stabilizer is xanthan gum, which has good foam stabilizing effect, good anti-burning effect and wide application; the selected foaming agent is SDS, which has low viscosity and good spreading property; the two are compounded according to a mass fraction of 3% each, and the foam spreading performance and foam stabilizing performance obtained reach the best;

[0037] The air valves 20 of the partitioned storage chamber 16 and the carbon dioxide cylinder 17 in the foam production system are opened and enter the foaming and filling device 13 through the transportation pipeline. A first pressure gauge 21 is connected to the air valve 20 of the carbon dioxide cylinder 17. The water supply valve 14 of the water storage tank 15 is opened. The foaming and filling device 13 can store the substances from the partitioned storage chamber 16 and the carbon dioxide cylinder 17 and can automatically stir and mix after adding water to produce a large amount of foam through the stirring device of the foaming and filling device 13. During the process of producing foam, the pressure inside the foaming and filling device 13 can be detected in real time according to the foaming pressure gauge 18;

[0038] The self-moving system includes an infrared distance sensor 9, a moving trolley 1, an automatic elevator 10, and a hydraulic support frame. The moving position of the hydraulic support frame is tracked in real time through the infrared distance sensor 9 on the self-moving system and automatically follows, and the foam is sprayed to the spark generation place through the foam nozzle 2 inside the foam automatic spraying system;

[0039] The automatic spraying system includes a second pressure gauge, a foam nozzle 2, a foam transportation flow control pipeline, and a speed regulating valve.

[0040] A method for spraying fire-proof foam during the movement of hydraulic supports in a working face, and a fire-proof foam spraying process equipment for the movement of hydraulic supports in a working face are applied.

[0041] The method includes the following steps:

[0042] S1. Turn on the power supply 12 to start the entire system.

[0043] S01. Open the gas valves 20 of the partition storage chamber 16 and the carbon dioxide cylinder 17 in the foam production system, and the gas enters the foam filling device 13 through the transportation pipeline. Open the water supply valve 14 of the water storage tank 15, and the water enters the foam filling device 13 through the transportation pipeline and is fully stirred and mixed to produce a large amount of foam. During the process of producing foam, the pressure in the foam filling device 13 can be detected in real time according to the foam pressure gauge 18. When a spark or smoke appears, the flame sensor 3 or the smoke sensor 4 is triggered, the voice and light alarm 7 emits an alarm and flashes, and the foam production system and the foam automatic spraying system are connected through the transmission cable.

[0044] S02. The produced foam is transported to the foam automatic spraying system through the pipeline, and automatically follows the moving position of the hydraulic support through the infrared distance sensor 9 on the self-moving system. The foam is sprayed to the place where the spark occurs through the foam nozzle 2 inside the foam automatic spraying system.

[0045] S2. When the voice and light alarm 7 emits an alarm and flashes, it means that the flame sensor 3 or the smoke sensor 4 detects a spark or smoke.

[0046] S3. When the pressure gauge reading on the outer wall of the foam filling device 13 starts to rise from 0 MPa, it means that the foaming agent - SDS, the foam stabilizer - xanthan gum, carbon dioxide, and water start to mix and enter the foam production stage. When the reading of the first pressure gauge 21 at the gas valve 20 of the carbon dioxide cylinder 17 starts to drop from 6 - 8 MPa, it means that carbon dioxide is being transported to the foam filling device 13 through the pipeline. When the pressure gauge reading of the carbon dioxide cylinder 17 is less than 0.7 MPa, the cylinder needs to be replaced.

[0047] S4. As the reading on the foam pressure gauge 18 continues to rise until it slightly fluctuates within a range not exceeding 0.1 MPa, it means that the foam production is completed.

[0048] S5. Then, when the hydraulic support starts to move, the infrared distance sensor 9 on the front arm of the automatic elevator 10 lights up, and the moving trolley 1 moves with the hydraulic support, which means that the automatic tracking stage is entered.

[0049] S6. When the voice and light alarm 7 emits an alarm and flashes, it means that the flame sensor 3 or the smoke sensor 4 detects a spark or smoke, and the foam automatic spraying stage is entered.

[0050] S7. A large amount of foam is transported to the top of the automatic lift 10 through the transport pipeline, and is sprayed onto the roof where sparks or smoke occur through the foam nozzles 2 at the top to extinguish the sparks or smoke, completing the process of preventing sparks.

[0051] S8. Frequently observe the reading of the foam pressure gauge 18 on the outer wall of the foam filling device 13. If it drops to near 0 MPa, it means that the foam in the foam filling device 13 has been exhausted. At this time, stop the movement of the hydraulic rack, restart the automatic foam production system, and when reaching the S4 stage, the hydraulic support frame can be moved again.

[0052] As described above, it is only a preferred specific embodiment of the invention, but the protection scope of the invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the invention, according to the technical solution and inventive concept of the invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the invention.

Claims

1. A process method for spraying fireproof foam during hydraulic support moving in a working face, including a process equipment for spraying fireproof foam during hydraulic support moving in a working face, characterized in that: The equipment includes an underground flame detection system, a foam production system, a foam automatic spraying system, and a self-moving system; The underground flame detection system includes a flame sensor, a smoke sensor, a voice and light alarm, and a power supply; The foam production system includes a partitioned storage chamber, a foaming and filling device, a carbon dioxide cylinder, a carbon dioxide transportation pipeline, a foam pump motor, a foaming pressure gauge, a water supply valve, and a water storage tank; The self-moving system includes an infrared distance sensor, a moving trolley, an automatic elevator, and a hydraulic support frame; The automatic spraying system includes a second pressure gauge, a foam nozzle, a foam flow control pipeline, and a speed regulating valve; The partitioned storage chamber is equally divided into two small chambers in the whole chamber, and a foaming agent - SDS and a foam stabilizer - xanthan gum are respectively installed in the two small chambers; The voice and light alarm and the evacuation indicator light are located at the upper right side of the side wall of the automatic elevator; the infrared distance sensor is located at the position on the left side of the side wall of the automatic elevator facing the hydraulic support frame; the foaming pressure gauge is located above the outer wall of the foaming and filling device; A first pressure gauge is connected to the gas valve of the carbon dioxide cylinder; When the hydraulic support frame starts to move, the whole system is started. Appropriate amount of foam is synthesized through the treatment of the foam production system. When sparks or smoke are generated by friction during the moving process, signals are transmitted from the flame sensor or smoke sensor in the flame detection system to the foam production system and the foam automatic spraying system. During the moving process of the hydraulic support frame, the infrared distance sensor on the self-moving system is used to track its moving direction and distance in real time to extinguish sparks or smoke, ultimately preventing the occurrence of underground working face fire accidents. During the whole process of preventing sparks, the flame sensor and smoke sensor of the flame detection system cooperate with the foam production system, and the foam is automatically sprayed by tracking the moving direction of the hydraulic support frame in real time through the self-moving system.

2. The method for spraying fireproof foam on the powered support during face moving according to claim 1, wherein: The flame sensor used is a dual purple and infrared flame sensor. The sensor has a narrow-band filtering function, operates at the center frequency wavelength of 4.4 μm, and performs integral operation through a high-performance microprocessor and an advanced mathematical algorithm model. Only the radiation spectrum that conforms to the flame characteristics will be recognized as a flame signal, while the false flame signals formed by other interference factors will be excluded. The response speed and sensitivity meet the millisecond-level requirements.

3. A process method for spraying anti-spark foam during face support shifting according to claim 1, characterized in that: The flame sensor and the smoke sensor are located on the top of the automatic elevator.

4. A method for spraying fireproof foam on a powered support in a working face, characterized in that: The foaming and filling device can store the substances from the partitioned storage chamber and the carbon dioxide cylinder and can automatically stir and mix them to produce a large amount of foam after adding water through the stirring device of the foaming and filling device.

5. A method for spraying fireproof foam on a powered support face according to claim 1, characterized in that: The selected foam stabilizer is xanthan gum, which has good foam stabilizing effect and good anti-burning effect and is widely used; the selected foaming agent is SDS, which has low viscosity and good spreading property; the two are compounded according to the mass fraction of 3% each, and the spreading performance and foam stabilizing performance of the obtained foam reach the best.

6. According to the process method for spraying fireproof foam during hydraulic support moving in a working face as claimed in claim 1, characterized in that: The method includes the following steps: S1. Turn on the power to start the entire system; S01. Open the gas valves of the partition storage chamber and carbon dioxide cylinders in the foam production system to enter the foaming filling device through the transportation pipeline. Open the water supply valve of the water storage tank. Water enters the foaming filling device through the transportation pipeline and is fully stirred and mixed to produce a large amount of foam. During the foam production process, the pressure inside the foaming filling device can be detected in real time according to the foaming pressure gauge. When a spark or smoke appears, the flame sensor or smoke sensor is triggered, and the voice and light alarm sounds an alarm and flashes. The foam production system and the automatic foam spraying system are connected through the transmission cable; S02. The produced foam is transported to the automatic foam spraying system through the pipeline. The infrared distance sensor on the self-moving system tracks the moving position of the hydraulic support frame in real time and automatically follows it. The foam is sprayed to the place where the spark occurs through the foam nozzles inside the automatic foam spraying system; S2. When the voice and light alarm sounds an alarm and flashes, it means that the flame sensor or smoke sensor has detected a spark or smoke; S3. When the reading of the pressure gauge on the outer wall of the foaming filling device starts to rise, it means that the foaming agent - SDS, foam stabilizer - xanthan gum, carbon dioxide and water start to mix and enter the foam production stage. When the reading of the first pressure gauge at the gas valve of the carbon dioxide cylinder starts to drop, it means that carbon dioxide is being transported to the foaming filling device through the pipeline. When the reading of the carbon dioxide cylinder pressure gauge is less than 0.7 MPa, the cylinder needs to be replaced; S4. As the reading on the foaming pressure gauge continues to rise until it fluctuates slightly, it means that the foam production is completed; S5. Then when the hydraulic support frame starts to move, the infrared distance sensor on the front arm of the automatic elevator lights up, and the moving trolley follows the hydraulic support frame to move, which means that the automatic tracking stage has been entered; S6. When the voice and light alarm sounds an alarm and flashes, it means that the flame sensor or smoke sensor has detected a spark or smoke, and the automatic foam spraying stage has been entered; S7. A large amount of foam is transported to the top of the automatic elevator through the transportation pipeline and sprayed to the top plate where the spark or smoke occurs through the foam nozzles at the top to extinguish the spark or smoke and complete the process of preventing sparks; S8. Observe the reading of the foaming pressure gauge on the outer wall of the foaming filling device frequently. If it drops to around 0 MPa, it means that the foam inside the foaming filling device has been exhausted. At this time, stop the movement of the hydraulic rack, restart the automatic foam production system, and when it reaches stage S4, the hydraulic support frame can be moved again.

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