Coal face goaf fire inspection device

Abstract

The invention relates to the technical field of coal mine safety monitoring, in particular to a coal face goaf fire inspection device. The device comprises a sealed monitoring pipeline, a distributed sensing module, a piston type mobile data acquisition device and a driving system. The sealed monitoring pipeline adopts two modes of independent laying of an air inlet way and an air return way or through laying of the air inlet way, an open-off cut and the air return way; the distributed sensing modules are arranged in an oxidation zone and a heat dissipation zone of a goaf, and synchronously collect concentration and temperature data of various characteristic gases; the piston type mobile data acquisition device is slidably mounted in the pipeline, and wirelessly receives and stores the sensing data; the driving system drives the collecting device to move in a reciprocating mode through the annularly-wound traction rope. According to the device, people do not need to enter a dangerous area, the problems that manual inspection is limited, wired monitoring is prone to damage, and wireless monitoring signals are interrupted are solved, monitoring coverage is complete, adaptability is high, fire hidden danger discovery timeliness can be improved, and reliable support is provided for goaf fire early warning.

Description

Technical Field

[0001] This invention relates to the field of coal mine safety monitoring technology, and in particular to a fire detection device for the goaf area of ​​a coal mining face. Background Technology

[0002] Based on the principles of inspection technology and data transmission methods, current methods for inspecting fires in coal mine goaf areas can be divided into manual monitoring, wired monitoring, and wireless monitoring. Manual monitoring, due to the risk of rockfalls and the potential accumulation of toxic gases such as methane and carbon monoxide in goaf areas, limits the inspection scope to the surrounding area. It can only infer fire conditions through indirect information from the outside (such as tunnel temperature and gas emissions), failing to capture key signals such as early-stage high temperatures and trace amounts of characteristic gases within the goaf in real time, thus delaying early warning. Wired monitoring uses physical cables to transmit data or perform sampling, currently mainly including fiber optic detection and bundled tube monitoring. Fiber optic monitoring utilizes fiber optic sensors laid on the tunnel walls to collect data such as temperature and strain of the tunnel walls through signal changes, indirectly inferring fire conditions in the goaf. However, it can only collect data from the tunnel walls, which cannot reflect the actual fire conditions inside the goaf, resulting in a disconnect from the actual situation and poor monitoring specificity. Bundled tube monitoring involves installing sampling devices with pipe protection in the intake and return airways of the goaf, collecting gas samples from the goaf area in the collapsed roadway region through fixed sampling points. However, the monitoring range is limited, with a large number of uncovered areas, and the flexibility is extremely poor. It can only collect limited data from the collapsed coal and rock mass in the intake and return airways of the goaf, and cannot cover the core area inside the goaf. Furthermore, the sampling devices are easily blocked by goaf dust and soaked by water accumulation, resulting in frequent false alarms and missed alarms. Wireless monitoring involves deploying multiple wireless sensors in the goaf, forming a communication network between the sensors through self-organizing network technology. Monitoring data needs to be transmitted outward step by step from fixed points deep in the goaf, following a step-by-step transmission mechanism of unidirectional transmission between fixed monitoring points deep in the goaf, intermediate nodes, and external receiving terminals. Moreover, the wireless connection between the sensors and the terminals is susceptible to network interruption due to factors such as rock collapse and electromagnetic interference within the goaf, which prevents the transmission of sensor data from deep in the goaf and affects the monitoring and early warning function of goaf fire parameters. Summary of the Invention

[0003] To address the problems of limited inspection range and delayed early warning, poor monitoring targeting and insufficient coverage, and numerous false alarms and missed reports, as well as the inability to transmit deep data due to network interruptions in the current methods of manual, wired, and wireless monitoring for fire detection in coal mine goaf areas, this invention provides a fire detection device for coal mining face goaf areas.

[0004] Therefore, the present invention provides the following technical solution: A fire detection device for goaf areas in coal mining faces includes a sealed monitoring pipeline, a distributed sensing module, a piston-type mobile data acquisition device, and a drive system. The laying path of the sealed monitoring pipeline includes the following two methods: The first method is to lay a sealed monitoring pipeline separately along the direction of the intake airway of the coal mining face, and at the same time lay another sealed monitoring pipeline separately along the direction of the return airway of the coal mining face; The second method is to lay the sealed monitoring pipeline from the entrance end of the intake airway of the coal mining face along its direction, and when it extends to the cut-out area, it is laid along the cut-out inclination and then continues to be laid along the direction of the return airway of the coal mining face, and finally extends to the exit end of the return airway. The distributed sensing module is deployed in the corresponding area according to the detection requirements, corresponding to two laying methods, and is deployed at the corresponding positions in the air intake lane, the open cut area, and the return air lane through which the sealed monitoring pipeline passes. The piston-type mobile data acquisition device is slidably installed inside the sealed monitoring pipeline. The piston-type mobile data acquisition device includes a housing, in which a wireless signal collection unit, a power supply unit, and a data storage unit are installed. The wireless signal collection unit can be wirelessly connected to the sensors of the distributed sensing module. Both the wireless signal collection unit and the data storage unit are electrically connected to the power supply unit, and the wireless signal collection unit is data-connected to the data storage unit. The drive system includes a traction rope, a fixed pulley, and a bidirectional drive device. The fixed pulley is installed at the end of the sealed monitoring pipe, and the traction rope is wound in a loop around the output end of the bidirectional drive device and the groove of the fixed pulley. The piston-type moving data acquisition device is fixedly connected to the preset point of the traction rope.

[0005] Furthermore, each set of distributed sensing modules includes a housing, a sensing unit, a mining intrinsically safe wireless transmission module, and an independent intrinsically safe power supply module. The sensing unit, the mining intrinsically safe wireless transmission module, and the independent intrinsically safe power supply module are installed inside the housing. The independent intrinsically safe power supply module is electrically connected to the sensing unit and the mining intrinsically safe wireless transmission module, respectively. The mining intrinsically safe wireless transmission module is data connected to the sensing unit and is used to wirelessly transmit the monitoring data collected by the sensing unit to the piston-type mobile data acquisition device.

[0006] Furthermore, the sensing unit includes a gas sensing unit and a temperature sensing unit. The gas sensing unit includes a methane sensor, an oxygen sensor, a carbon monoxide sensor, a carbon dioxide sensor, an ethylene sensor, and an acetylene sensor. The temperature sensing unit is an intrinsically safe temperature sensor for mining, with a measurement range of 0℃ to 300℃ and a measurement accuracy of ±0.5℃.

[0007] Furthermore, a polytetrafluoroethylene membrane or expanded polytetrafluoroethylene membrane is installed at the gas collection inlet of the gas sensing unit.

[0008] Furthermore, the housing of the piston-type mobile data acquisition device is cylindrical in the middle and conical at both ends, with the outer wall of the middle part of the housing fitting against the inner wall of the sealed monitoring pipeline.

[0009] Furthermore, the bidirectional drive device includes a wheel and a bracket. The bracket is installed on the outside of the inlet end of the sealed monitoring pipeline. The wheel is rotatably mounted on the bracket via a rotating shaft. A traction rope is wound around the wheel. The rotating shaft of the wheel is connected to a crank rocker or a drive motor. The drive motor is mounted on the bracket.

[0010] Furthermore, the outer shell of the distributed sensing module is made of high-strength alloy material, which has impact resistance, smash resistance and wear resistance; the traction rope is a flame-retardant and anti-static ultra-high molecular weight polyethylene rope.

[0011] Furthermore, in the first and second laying methods, the spacing between two adjacent sets of distributed sensing modules is less than the measured width of the oxidation zone in the goaf, the distance between each distributed sensing module and the sealed monitoring pipeline, and less than the effective transmission distance of the intrinsically safe wireless transmission module for mining within the distributed sensing module.

[0012] Furthermore, the minimum number of distributed sensing modules to be arranged along the strike direction within the oxidation zone and heat dissipation zone of the goaf is:

[0013] In the formula: The minimum number of distributed sensing modules to be deployed, dimensionless; The width of the oxide band is in meters (m). Width of the heat dissipation strip, in meters; The distance is the transmission distance of the sensor antenna, in meters (m).

[0014] Furthermore, adjacent pipe sections of the sealed monitoring pipeline are connected by flange sealing or welding sealing.

[0015] Advantages and positive effects of the present invention: By using a mobile data acquisition device to reciprocate within the pipeline, inspections of the goaf can be carried out without the need for personnel to enter the dangerous areas of the goaf. This solves the problem of delayed early warnings caused by the narrow scope and low frequency of manual inspections, and improves the timeliness of fire hazard detection.

[0016] The distributed sensing modules are deployed in the goaf area, providing wide coverage. These modules can simultaneously capture changes in the concentration and temperature of multiple characteristic gases without relying on extensive cabling, avoiding the shortcomings of traditional wired monitoring which is susceptible to geological deformation and rockfall damage. They are adapted to the dynamic environment of the goaf area, ensuring comprehensive monitoring without blind spots.

[0017] By adopting a short-range wireless transmission mode, the sensor module data is directly sent to the mobile acquisition device inside the pipeline, reducing electromagnetic interference and signal loss, and avoiding signal attenuation and network interruption during long-distance wireless monitoring.

[0018] It supports separate installation of intake and return airways to meet segmented monitoring scenarios; it can also be installed in a continuous manner across intake, cut-in, and return airways to cover long working faces. It can be adapted to different coal mining face layouts without complex modifications, demonstrating strong versatility and reducing the difficulty of construction adaptation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the first installation method of a fire detection device for the goaf area of ​​a coal mining face provided by the present invention.

[0021] Figure 2 This is a schematic diagram of the second installation method of a fire detection device for the goaf area of ​​a coal mining face provided by the present invention.

[0022] Figure 3 This invention provides a distribution diagram of the distributed sensing module of a fire detection device for goaf areas in coal mining faces.

[0023] Figure 4 This invention provides a schematic diagram of a piston-type mobile data acquisition device and its drive system for a coal mining face goaf fire detection device.

[0024] Figure 5 This is a schematic diagram of the structure of a distributed sensing module for a coal mining face goaf fire detection device provided by the present invention.

[0025] In the diagram: 1. Sealed monitoring pipeline; 2. Intake airway; 3. Return airway; 4. Distributed sensing module; 5. Piston-type mobile data acquisition device; 6. Housing; 7. Traction rope; 8. Fixed pulley; 9. Rotary wheel; 10. Crank rocker arm; 11. Drive motor; 12. Housing; 13. Intrinsically safe wireless transmission module for mining; 14. Independent intrinsically safe power supply module; 15. Gas sensing unit; 16. Temperature sensing unit. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0027] This invention provides a fire detection device for the goaf area of ​​a coal mining face, comprising a sealed monitoring pipeline 1, a distributed sensing module 4, a piston-type moving data acquisition device 5, and a drive system.

[0028] The laying path of the sealed monitoring pipeline 1 includes the following two methods: The first laying method is as follows: Figure 1 As shown, a sealed monitoring pipeline 1 is separately installed along the direction of the intake airway 2 of the coal mining face, and another sealed monitoring pipeline 1 is separately installed along the direction of the return airway 3 of the coal mining face. The second installation method is as follows... Figure 2 As shown, the sealed monitoring pipeline 1 is laid from the entrance end of the intake airway 2 of the coal mining face along its direction. When it extends to the cut-out area, it continues to be laid along the direction of the cut-out and then along the return airway 3 of the coal mining face, eventually extending to the outlet end of the return airway 3. Adjacent pipeline sections of the sealed monitoring pipeline are connected by flange sealing or welding sealing.

[0029] like Figure 3 As shown, the distributed sensing module 4 is installed in the corresponding positions of the air intake lane 2, the open cut area, and the return air lane 3 along the route of the sealed monitoring pipeline 1, according to the detection requirements and corresponding to the two laying methods.

[0030] like Figure 5 As shown, each distributed sensing module 4 includes a housing 12, a sensing unit, a mining intrinsically safe wireless transmission module 13, and an independent intrinsically safe power supply module 14. The sensing unit, the mining intrinsically safe wireless transmission module 13, and the independent intrinsically safe power supply module 14 are installed inside the housing 12. The independent intrinsically safe power supply module 14 is electrically connected to the sensing unit and the mining intrinsically safe wireless transmission module 13, respectively. The mining intrinsically safe wireless transmission module 13 is data connected to the sensing unit and is used to wirelessly transmit the monitoring data collected by the sensing unit to the piston-type mobile data acquisition device 5.

[0031] The sensing unit includes a gas sensing unit 15 and a temperature sensing unit 16. The gas sensing unit 15 includes a methane sensor, an oxygen sensor, a carbon monoxide sensor, a carbon dioxide sensor, an ethylene sensor, and an acetylene sensor. The temperature sensing unit 16 is an intrinsically safe temperature sensor for mining applications, with a measurement range of 0℃ to 300℃ and a measurement accuracy of ±0.5℃. A polytetrafluoroethylene (PTFE) membrane or expanded PTFE membrane is installed at the gas collection inlet of the gas sensing unit 15.

[0032] Piston-type mobile data acquisition device 5 is slidably installed inside the sealed monitoring pipeline 1, such as... Figure 4 As shown, the housing 6 of the piston-type mobile data acquisition device 5 is cylindrical in the middle and conical at both ends, with the outer wall of the middle part of the housing 6 fitting against the inner wall of the sealed monitoring pipeline 1.

[0033] The piston-type mobile data acquisition device 5 includes a housing 6, in which a wireless signal collection unit, a power supply unit, and a data storage unit are installed. The wireless signal collection unit can be wirelessly connected to the sensors of the distributed sensing module 4. Both the wireless signal collection unit and the data storage unit are electrically connected to the power supply unit, and the wireless signal collection unit is data-connected to the data storage unit.

[0034] The drive system includes a traction rope 7, a fixed pulley 8, and a bidirectional drive device. The fixed pulley 8 is installed at the end of the sealed monitoring pipeline 1. The bidirectional drive device includes a rotating wheel 9 and a bracket. The bracket is installed on the outside of the inlet end of the sealed monitoring pipeline 1. The rotating wheel 9 is rotatably mounted on the bracket via a rotating shaft. The traction rope 7 is wound in a loop within the grooves of the rotating wheel 9 and the fixed pulley 8 of the bidirectional drive device. The housing 6 of the piston-type moving data acquisition device 5 is fixedly connected to the preset point of the traction rope 7. The rotating shaft of the rotating wheel 9 is connected to a crank rocker arm 10 and a drive motor 11, which is mounted on the bracket.

[0035] The outer shell 12 of the distributed sensing module 4 is made of high-strength alloy material, which has the properties of impact resistance, smash resistance and wear resistance; the traction rope 7 is a flame-retardant and anti-static ultra-high molecular weight polyethylene rope.

[0036] In the first and second laying methods, the spacing between two adjacent sets of distributed sensing modules 4 is less than the measured width of the oxidation zone in the goaf, the distance between each distributed sensing module 4 and the sealed monitoring pipeline 1, and less than the effective transmission distance of the intrinsically safe wireless transmission module 13 for mining within the distributed sensing module 4.

[0037] The minimum number of distributed sensing modules 4 arranged along the strike direction in the oxidation zone and heat dissipation zone of the goaf is:

[0038] In the formula: The minimum number of distributed sensing modules 4 to be arranged is dimensionless. The width of the oxide band is in meters (m). Width of the heat dissipation strip, in meters; The distance is the transmission distance of the sensor antenna, in meters (m).

[0039] Working principle: Based on the actual layout of the coal face, the installation method of the sealed monitoring pipeline 1 is selected. If segmented monitoring is required, the first installation method is selected, with sealed monitoring pipelines 1 installed separately along the intake airway 2 and return airway 3. If full coverage is required, the second installation method is selected, with pipelines 1 installed continuously along the intake airway 2, the cut-out area, and the return airway 3. Adjacent sections of the sealed monitoring pipeline 1 are sealed and connected by flanges or welding to form a fully enclosed protective channel. In the goaf area, along the working face direction, the spacing between adjacent distributed sensing modules 4 is less than the measured width of the oxidation zone to ensure no monitoring blind spots in the direction of the goaf. Along the goaf dip direction, the distance between the distributed sensing module 4 and the sealed monitoring pipeline 1 does not exceed the effective transmission distance of the intrinsically safe wireless transmission module 13 antenna to ensure data transmission stability. When the distributed sensing module 4 is installed along the cut-out dip direction, the distance between each distributed sensing module 4 and the sealed monitoring pipeline 1 is less than the effective transmission distance of the intrinsically safe wireless transmission module 13 antenna within the distributed sensing module 4.

[0040] The distributed sensing module 4 synchronously collects environmental data of the goaf area through its built-in gas sensing unit 15 and temperature sensing unit 16. The gas sensing unit 15 includes a methane sensor, oxygen sensor, carbon monoxide sensor, carbon dioxide sensor, ethylene sensor, and acetylene sensor. After dust and water vapor are filtered through a polytetrafluoroethylene membrane at the acquisition inlet, it captures changes in the concentration of characteristic gases related to spontaneous combustion of residual coal. The temperature sensing unit 16 monitors the ambient temperature in real time. The distributed sensing module 4's built-in independent intrinsically safe power supply module 14 continuously supplies power to the gas sensing unit 15, temperature sensing unit 16, and the intrinsically safe wireless transmission module 13, ensuring uninterrupted data acquisition. The intrinsically safe wireless transmission module 13 wirelessly transmits the collected gas concentration and temperature data in real time to the piston-type mobile data acquisition device 5 inside the sealed monitoring pipeline 1.

[0041] The piston-type mobile data acquisition device 5 reciprocates within the sealed monitoring pipeline 1 under the traction of a drive system. Its cylindrical housing 6 fits snugly against the inner wall of the pipeline 1, while its tapered ends reduce resistance and ensure smooth operation. The built-in wireless signal collection unit of the piston-type mobile data acquisition device 5 receives monitoring data from the distributed sensor modules 4 at close range, achieving high signal reception accuracy and avoiding signal interference. The received data is transmitted in real-time to the data storage unit for buffering, preventing data loss due to transmission interruptions. Simultaneously, the power supply provides stable power to the wireless signal collection unit and the data storage unit, ensuring continuous operation of the core functions.

[0042] When the drive system is driven by an electric motor, the drive motor 11 rotates in either the forward or reverse direction, causing the wheel 9 to rotate around the shaft in either the forward or reverse direction. The traction rope 7 then moves the piston-type mobile data acquisition device 5 in either the forward or reverse direction, covering the entire monitoring range of the pipeline. If there is a power outage underground or an emergency operation is required, the wheel 9 can be driven to rotate by cranking the crank arm 10 to achieve manual traction.

[0043] The piston-type mobile data acquisition device 5 continuously receives and stores monitoring data from each distributed sensing module 4 during its movement. Staff can extract the stored data through the data export interface and, combined with trends in characteristic gas concentrations and temperature anomalies, determine whether there are potential fire hazards in the goaf. The outer shell 12 of the distributed sensing module 4 is made of high-strength alloy material, which can withstand rockfalls and dust impacts in the goaf, ensuring stable module operation. Data from multi-parameter collaborative monitoring can accurately reflect the characteristics of different stages of spontaneous combustion of residual coal, providing reliable data support for early fire warning, hazard location, and subsequent handling, achieving dynamic monitoring and precise control of fire risks in the goaf.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fire detection device for the goaf area of ​​a coal mining face, characterized in that, It includes a sealed monitoring pipeline (1), a distributed sensing module (4), a piston-type mobile data acquisition device (5), and a drive system; The laying path of the sealed monitoring pipeline (1) includes the following two methods: the first method is to lay a sealed monitoring pipeline (1) separately along the direction of the coal mining face intake airway (2) and at the same time lay another sealed monitoring pipeline (1) separately along the direction of the coal mining face return airway (3); the second method is to lay the sealed monitoring pipeline (1) from the entrance end of the coal mining face intake airway (2) along its direction, and when it extends to the opening cut area, it is laid along the opening cut tendency and then continues to be laid along the direction of the coal mining face return airway (3), and finally extends to the exit end of the return airway (3). The distributed sensing module (4) is installed at the corresponding locations of the air intake lane (2), the open cut area, and the return air lane (3) along the route of the sealed monitoring pipeline (1) according to the detection requirements and the two laying methods. The piston-type mobile data acquisition device (5) is slidably installed inside the sealed monitoring pipe (1). The piston-type mobile data acquisition device (5) includes a housing (6). A wireless signal collection unit, a power supply unit, and a data storage unit are installed inside the housing (6). The wireless signal collection unit can be wirelessly connected to the sensors of the distributed sensing module (4). Both the wireless signal collection unit and the data storage unit are electrically connected to the power supply unit. The wireless signal collection unit is data-connected to the data storage unit. The drive system includes a traction rope (7), a fixed pulley (8), and a bidirectional drive device. The fixed pulley (8) is installed at the end of the sealed monitoring pipe (1). The traction rope (7) is wound in a loop around the output end of the bidirectional drive device and in the groove of the fixed pulley (8). The piston-type moving data acquisition device (5) is fixedly connected to the preset position of the traction rope (7).

2. The fire detection device for the goaf area of ​​a coal mining face according to claim 1, characterized in that, Each of the distributed sensing modules (4) includes a housing (12), a sensing unit, a mining intrinsically safe wireless transmission module (13), and an independent intrinsically safe power supply module (14). The sensing unit, the mining intrinsically safe wireless transmission module (13), and the independent intrinsically safe power supply module (14) are installed inside the housing (12). The independent intrinsically safe power supply module (14) is electrically connected to the sensing unit and the mining intrinsically safe wireless transmission module (13), respectively. The mining intrinsically safe wireless transmission module (13) is data connected to the sensing unit and is used to wirelessly transmit the monitoring data collected by the sensing unit to the piston-type mobile data acquisition device (5).

3. The fire detection device for the goaf area of ​​a coal mining face according to claim 1, characterized in that, The sensing unit includes a gas sensing unit (15) and a temperature sensing unit (16). The gas sensing unit (15) includes a methane sensor, an oxygen sensor, a carbon monoxide sensor, a carbon dioxide sensor, an ethylene sensor, and an acetylene sensor. The temperature sensing unit (16) is an intrinsically safe temperature sensor for mining, with a measurement range of 0℃ to 300℃ and a measurement accuracy of ±0.5℃.

4. A fire detection device for goaf areas in coal mining faces according to claim 3, characterized in that, The gas sensing unit (15) has a polytetrafluoroethylene membrane or expanded polytetrafluoroethylene membrane installed at its gas collection inlet.

5. A fire detection device for goaf areas in coal mining faces according to claim 1, characterized in that, The housing (6) of the piston-type mobile data acquisition device (5) is cylindrical in the middle and conical at both ends. The outer wall of the middle part of the housing (6) is in contact with the inner wall of the sealed monitoring pipe (1).

6. A fire detection device for goaf areas in coal mining faces according to claim 1, characterized in that, The bidirectional drive device includes a wheel (9) and a bracket. The bracket is installed on the outside of the inlet end of the sealed monitoring pipe (1). The wheel (9) is rotatably mounted on the bracket via a rotating shaft. The traction rope (7) is wound around the wheel (9). The rotating shaft of the wheel (9) is connected to a crank rocker arm (10) or a drive motor (11). The drive motor (11) is mounted on the bracket.

7. A fire detection device for goaf areas in coal mining faces according to claim 2, characterized in that, The outer shell (12) of the distributed sensing module (4) is made of high-strength alloy material, which has the properties of impact resistance, anti-smashing and wear resistance; the traction rope (7) is a flame-retardant and anti-static ultra-high molecular weight polyethylene rope.

8. A fire detection device for goaf areas in coal mining faces according to claim 1, characterized in that, In the first and second laying methods, the spacing between two adjacent sets of distributed sensing modules (4) is less than the measured width of the oxidation zone in the goaf, the distance between each distributed sensing module (4) and the sealed monitoring pipeline (1), and less than the effective transmission distance of the antenna of the intrinsically safe wireless transmission module (13) in the distributed sensing module (4).

9. A fire detection device for goaf areas in coal mining faces according to claim 2, characterized in that, The minimum number of distributed sensing modules (4) arranged along the strike direction in the oxidation zone and heat dissipation zone of the goaf is: In the formula: The minimum number of distributed sensing modules (4) to be arranged is dimensionless. The width of the oxide band is in meters (m). Width of the heat dissipation strip, in meters; The distance is the transmission distance of the sensor antenna, in meters (m).

10. A fire detection device for goaf areas in coal mining faces according to claim 1, characterized in that, The adjacent pipe sections of the sealed monitoring pipeline (1) are connected by flange sealing or welding sealing.

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