Networking type monitoring device and monitoring method for spontaneous combustion in underground goaf of coal mine

Abstract

The invention relates to an underground coal mine goaf spontaneous combustion networking type monitoring device, which belongs to the technical field of underground coal mine goaf spontaneous combustion monitoring, and comprises a panel display terminal, a monitoring host and a wireless detector group, the monitoring host is arranged at the corner of one side, close to the air inlet way, of the working surface; the panel display terminal is connected with the monitoring host; the wireless detector group comprises a plurality of wireless detectors which are distributed in the goaf along the stoping direction; the panel display terminal, the monitoring host and the wireless detector group are interconnected through a built-in LoRa module; the monitoring host moves in the forward stoping direction along with working face stoping. Collected information sharing among the wireless detector groups in the device is realized, long-distance signal transmission power consumption is reduced, and effective working time of the wireless detectors in a goaf is prolonged; the arrangement of the networking type wireless detectors improves the accuracy of natural ignition monitoring in the goaf and the monitoring precision of the ignition area. The invention further provides a corresponding monitoring method.

Description

Technical Field

[0001] The invention belongs to the technical field of spontaneous combustion monitoring in coal mine goafs, and relates to a networked monitoring device and a monitoring method for spontaneous combustion in coal mine goafs. Background Art

[0002] Spontaneous combustion of coal seams is a serious safety hazard faced during mining operations. Over 60% of fires caused by spontaneous combustion occur in goafs. Furthermore, spontaneous combustion in goafs presents a high potential risk, with hidden fire sources and high control challenges. Therefore, effective and accurate monitoring of spontaneous combustion in goafs is essential for safe and efficient mining operations and is of great practical significance. Furthermore, with the continuous improvement of coal mine mechanization, the mining face height and speed are gradually increasing. This leads to high air leakage and increased coal waste in goafs, increasing the risk of spontaneous combustion. This places higher demands on online monitoring of spontaneous combustion in goafs.

[0003] Currently, spontaneous combustion monitoring in goafs is mostly done using bundled pipe monitoring. This involves pre-installing bundled pipes in the air intake and return lanes of the mining face. Once mining reaches this area, the pipes are used to pump air through these pre-installed bundled pipes to measure parameters such as gas concentration and temperature at different locations within the goaf to determine whether the coal seam is spontaneously combusting. However, due to the large area of the goaf within the mining face, bundled pipes can only be deployed in lanes at both ends. Consequently, there are fewer monitoring points within the goaf, especially in the central area. This results in partial and biased monitoring data, which affects the accuracy of identifying spontaneous combustion in the goaf's residual coal. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a networked monitoring device and monitoring method for spontaneous combustion in the goaf of underground coal mines, increase the effective and long-term monitoring of the gas composition in each area of the goaf, accurately judge the spontaneous combustion situation in the goaf, and improve the safety of mine working face mining.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] On the one hand, the present invention provides a networked monitoring device for spontaneous combustion in the goaf of an underground coal mine, comprising a flat-panel display terminal, a monitoring host, and a wireless detector group; the monitoring host is arranged at the corner of the working face on the side of the air intake tunnel; the flat-panel display terminal is connected to the monitoring host; the wireless detector group comprises a plurality of wireless detectors distributed in the goaf along the mining direction; the flat-panel display terminal, the monitoring host, and the wireless detector group are interconnected through a built-in LoRa module; the monitoring host moves forward in the mining direction as the working face is mined.

[0007] Furthermore, the monitoring host includes a shell, in which a data processing module, a signal conversion module, a power module, and a LoRa module a are arranged. A groove for embedding a flat-panel display terminal is provided on the front of the shell, and a wireless charger is provided on the side of the groove close to the shell for wirelessly charging the flat-panel display terminal; a transparent glass plate 26 is provided on the front of the groove, and the display panel of the flat-panel display terminal is adjacent to the glass plate; the signal conversion module and the data processing module are used to receive the collected data of the wireless detector in the goaf from the LoRa module, perform data storage, processing and identification, and send information to the flat-panel display terminal after the monitoring results are formed.

[0008] Furthermore, the front of the housing of the monitoring host is also provided with an early warning information light 25, a speaker 24 and a shutdown button, and the early warning information light 25, the speaker 24 and the shutdown button are all connected to the data processing module; the early warning information light 25 and the speaker 24 are used to issue warnings based on the abnormal monitoring results sent by the data processing module, and the shutdown button is used to turn off the warning light and sound.

[0009] Furthermore, the wireless detector includes a spherical shell, in which a graphene battery pack, a data acquisition board, a timer, a memory and a LoRa module b are arranged; an indicator light, a charging port and a columnar channel are arranged outside the spherical shell; the columnar channel is used to connect the space inside and outside the spherical shell, and a sensor group is arranged in the columnar channel; the sensor group is connected to the data acquisition board, and the timer ensures that the time base of the collected signals of multiple wireless detectors in the goaf is consistent; the memory is used to store the collected sensor data; the graphene battery pack is used to power each module; the charging port is connected to the graphene battery pack; the indicator light is used to determine whether the wireless detector is operating normally.

[0010] Furthermore, the sensor group includes temperature, carbon monoxide, carbon dioxide, oxygen, acetylene, and ethylene monitoring sensors.

[0011] Furthermore, a rubber plug is provided at the outer end of the charging port to protect the charging port from impurities when the battery is not charging.

[0012] Furthermore, the wireless detectors can send their own collected data and receive data collected by other wireless detectors through the LoRa module, realizing data sharing between networked wireless detector groups in the goaf, reducing power consumption of long-distance data transmission, and increasing the working time of wireless detectors.

[0013] Furthermore, the information collected by the wireless detector includes location information, time information, temperature and gas concentration data of the wireless detector, and the location information is written into the memory when the wireless detector is installed.

[0014] In another aspect, the present invention provides a monitoring method for a networked monitoring device for spontaneous combustion in a goaf of an underground coal mine, comprising the following steps:

[0015] S1: Charge the wireless detector to full power, and check the operating status of the wireless detector, monitoring host and flat panel display terminal to ensure normal use;

[0016] S2: Install the monitoring host at the corner of the underground working face close to the air inlet tunnel, connect the power supply cable for power supply; place the flat panel display terminal in the groove on the housing of the monitoring host for monitoring;

[0017] S3: Install a wireless detector group on the side of the working face close to the goaf, with both ends fixed and the middle stepping. The details are as follows: First, install two wireless detectors at the coal wall where the air intake lane, return air lane and the critical surface of the goaf intersect, which are end face detectors; the number of wireless detectors installed inside the goaf parallel to the working face is n = S (L / 30 )-1, where the function S(L / 30 ) means taking L / 30 The quotient of L represents the length of the working face. The spacing between n detectors is 30m, and the spacing between the detector close to the return air lane and the detector at the end of the return air lane is 30m. As the working face advances D=20m in the mining direction, two end-face detectors and n internal detectors are installed again. At this time, the spacing between n detectors is also 30m, but the spacing between the detector close to the air intake lane and the detector at the end of the air intake lane is 30m. In this way, the networked detector installation in the goaf is completed cyclically as mining progresses.

[0018] S4: The wireless detector group collects the required parameter data in the goaf and transmits it to the monitoring host, and finally realizes effective monitoring of the spontaneous combustion situation in the goaf through the flat panel display terminal.

[0019] The beneficial effects of the present invention are:

[0020] 1. The monitoring device has a simple layout process, which can realize automatic collection and real-time monitoring of temperature and gas concentration data in the goaf. It does not need to extract gas from the goaf to the mining area and then measure concentration parameters as in the traditional bundle tube monitoring method, and it changes from intermittent measurement to full-time monitoring.

[0021] 2. The networked wireless detector arrangement increases the monitoring area in the goaf, reduces the monitoring "blind spots" of traditional bundle tube monitoring, and improves monitoring accuracy.

[0022] 3. The disadvantages of high power consumption and large electricity consumption of wireless long-distance transmission between traditional underground monitoring sensors and monitoring hosts can be compensated by networked wireless detectors, which effectively reduces the power consumption of wireless detectors and increases the online monitoring working time, ensuring that the monitoring system can operate for a long time.

[0023] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0025] Figure 1 Schematic diagram of the monitoring method of the networked monitoring device for spontaneous combustion in the goaf of an underground coal mine according to the present invention;

[0026] Figure 2 A top view of the combination of the monitoring host and the flat panel display terminal in the present invention;

[0027] Figure 3 This is a cross-sectional diagram of the combination of the monitoring host and the flat-panel display terminal in the present invention;

[0028] Figure 4 This is a top view of the wireless detector in the present invention;

[0029] Figure 5 It is a cross-sectional schematic diagram of the wireless detector in the present invention.

[0030] Figure numerals: 1-flat panel display terminal; 2-monitoring host; 21-housing; 22-rectangular groove; 23-shutdown button; 24-speaker 24; 25-warning information light 25; 26-transparent glass plate 26; 27-LoRa module a; 28-signal conversion module; 29-data processing module; 210-power module; 211-wireless charger; 3-wireless detector; 31-indicator light; 32-columnar channel; 33-charging port; 34-spherical shell; 35-sensor group; 36-LoRa module b; 37-data acquisition board; 38-memory; 39-graphene battery pack; 310-timer; 311-connecting cable. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0032] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0033] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring the embodiments of the present invention.

[0034] Example 1:

[0035] like Figure 1-5As shown, the present invention provides a networked monitoring device for spontaneous combustion in coal mine goafs, comprising a flat-panel display terminal 1, a monitoring host 2, three sets of wireless detectors, and a power supply cable. The flat-panel display terminal 1 is embedded in the surface of the monitoring host housing 22 and has a wireless charging function. The flat-panel display terminal 1, the monitoring host 2, and the wireless detectors 3 are all equipped with LoRa modules for data transmission and reception. The monitoring host 2 is installed at the corner of the working face on the side of the air intake tunnel and is powered underground via a power supply cable. The three sets of wireless detectors are arranged equidistantly within the goaf along the mining direction. A display screen is provided on the front of the flat-panel display terminal 1 for displaying monitoring data and results collected by the wireless detectors 3 and processed by the monitoring host 2 within the goaf. The display screen also provides simulated thermal imaging of the goaf and a gas concentration distribution map, enabling mobile use within the working face. The monitoring host 2 also includes a built-in signal conversion module 28, a data processing module 29, a power supply module 210, and a wireless charger 211. The signal conversion module 28 and the data processing module 29 are used to store, process, and identify data collected by the wireless detector 3 within the goaf, received by the LoRa module a27. Once the data is generated, the data is transmitted to the flat-panel display terminal 1. The wireless charger 211 is connected to the power supply module 210. The monitoring host 2 moves forward in the mining direction as the working face is mined. A rectangular recess 22 is provided on the front surface of the monitoring host housing 22. The front of the recess is provided with a transparent glass panel 26. A wireless charger 211 is located within the recess, near the interior of the monitoring host 2. The recess is used to mount the flat-panel display terminal 1, whose display screen is adjacent to the transparent glass panel 26. The wireless charger 211 wirelessly charges the flat-panel display terminal 1. A warning light 25, a speaker 24, and a shutdown button 23 are located on the underside of the front surface of the monitoring host housing 22. The warning light 25 and speaker 24 are used to indicate abnormal monitoring results, while the shutdown button 23 is used to silence the warning light and sound. The wireless detector 3 comprises a spherical shell 34 and a hollow structure. A detection indicator light 31 and a charging port 33 are located on the outside of the spherical shell 34. Columnar channels 32, which connect to the atmosphere and the interior, are located at the top and bottom of the spherical shell 34. A sensor group 35 is installed within the columnar channel 32. The sensor group 35 includes sensors for monitoring temperature, carbon monoxide, carbon dioxide, oxygen, acetylene, and ethylene. The detection indicator light 31 is used to determine whether the wireless detector 3 is operating properly. A rubber plug is installed at the outer end of the charging port 33 to protect it from impurities when not charging. The hollow structure inside the wireless detector 3 also houses a graphene battery pack 39, a data acquisition board 37, a connecting cable 311, a timer 310, and a memory 38. Each wireless detector 3 can transmit its own collected data and receive data from other wireless detectors 3 via a LoRa module b36, enabling data sharing between networked wireless detectors 3 within the goaf, reducing power consumption during long-distance data transmission and increasing the operating time of the wireless detectors 3.The graphene battery pack 39 in the wireless detector 3 can enable the wireless detector 3 to work continuously for more than 90 days; the timer 310 ensures that the time base of the signals collected by multiple wireless detectors 3 in the goaf is consistent; the collected information includes the location information, time information, temperature and gas concentration data of the wireless detector 3. The location information is written into the internal memory 38 when the wireless detector 3 is installed.

[0036] Example 2:

[0037] The present invention provides a monitoring method of a networked monitoring device for spontaneous combustion in a goaf of an underground coal mine, comprising the following steps:

[0038] S1: Complete charging of the wireless detector to full power, and check the operating status of the wireless detector, monitoring host and flat panel display terminal to ensure that the networked monitoring device for spontaneous combustion in the coal mine goaf is normal and available;

[0039] S2: Install the monitoring host at the corner of the underground working face close to the air inlet tunnel, connect the power cables and power it on; place the flat panel display terminal in the rectangular groove on the front surface of the monitoring host housing, and run the monitoring software;

[0040] S3: Install a wireless detector group on the side of the working face close to the goaf, with both ends fixed and the middle in a "stepping" manner. The details are as follows: First, install two wireless detectors at the coal wall where the air intake lane, return air lane and the critical surface of the goaf intersect, which are end face detectors; the number of wireless detectors installed inside the goaf parallel to the working face is n = S (L / 30 )-1, where the function S(L / 30 ) means taking L / 30 The quotient of L represents the length of the working face. The spacing between n detectors is set at 30m, and the spacing between the detectors near the return air lane and the detectors at the end of the return air lane is set at 30m. As the working face advances D = 20m in the mining direction, two end-face detectors and n internal detectors are installed again. At this time, the spacing between n detectors is also set at 30m, but the spacing between the detectors near the intake air lane and the detectors at the end of the intake air lane is set at 30m. In this way, the networked detector installation in the goaf is completed cyclically as mining progresses.

[0041] S4: The wireless detector group collects the required parameter data in the goaf and transmits it to the monitoring host, and finally realizes effective monitoring of the spontaneous combustion situation in the goaf through the flat panel display terminal.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. A networked monitoring device for spontaneous combustion in goaf areas of coal mines, characterized by: It includes a flat panel display terminal, a monitoring host and a wireless detector group; the monitoring host is arranged at the corner of the working face on the side of the air inlet tunnel; the flat panel display terminal is connected to the monitoring host; the wireless detector group includes multiple wireless detectors distributed in the goaf along the mining direction; the flat panel display terminal, the monitoring host and the wireless detector group are interconnected through a built-in LoRa module; the monitoring host moves forward in the mining direction as the working face is mined.

2. The networked monitoring device for spontaneous combustion in goaf of coal mines according to claim 1 is characterized in that: The monitoring host includes a shell, in which a data processing module, a signal conversion module, a power module, and a LoRa module a are arranged. A groove for embedding a flat-panel display terminal is provided on the front of the shell, and a wireless charger is provided on the side of the groove close to the shell for wirelessly charging the flat-panel display terminal; a transparent glass plate 26 is provided on the front of the groove, and the display panel of the flat-panel display terminal is adjacent to the glass plate; the signal conversion module and the data processing module are used to receive the data collected by the wireless detector in the goaf from the LoRa module, perform data storage, processing and identification, and send information to the flat-panel display terminal after forming the monitoring results.

3. The networked monitoring device for spontaneous combustion in goaf of underground coal mines according to claim 1 is characterized in that: The front of the monitoring host shell is also provided with an early warning information light 25, a speaker 24 and a shutdown button, and the early warning information light 25, the speaker 24 and the shutdown button are all connected to the data processing module; the early warning information light 25 and the speaker 24 are used to issue warnings based on the abnormal monitoring results sent by the data processing module, and the shutdown button is used to turn off the warning light and sound.

4. The networked monitoring device for spontaneous combustion in goaf of underground coal mines according to claim 1 is characterized in that: The wireless detector includes a spherical shell, wherein a graphene battery pack, a data acquisition board, a timer, a memory and a LoRa module b are arranged inside the spherical shell; an indicator light, a charging port and a columnar channel are arranged outside the spherical shell; The columnar channel is used to connect the inner and outer spaces of the spherical shell, and a sensor group is arranged in the columnar channel; the sensor group is connected to the data acquisition board, and the timer ensures that the time base of the signals collected by multiple wireless detectors in the goaf is consistent; The memory is used to store the collected sensor data; the graphene battery pack is used to power each module; the charging port is connected to the graphene battery pack; and the indicator light is used to determine whether the wireless detector is operating normally.

5. The networked monitoring device for spontaneous combustion in goaf of underground coal mines according to claim 1 is characterized in that: The sensor group includes temperature, carbon monoxide, carbon dioxide, oxygen, acetylene, and ethylene monitoring sensors.

6. The networked monitoring device for spontaneous combustion in goaf of underground coal mines according to claim 1, characterized in that: A rubber plug is provided at the outer end of the charging port to protect the charging port from impurities when not charging.

7. The networked monitoring device for spontaneous combustion in goaf of underground coal mines according to claim 1, characterized in that: The wireless detectors can send their own collected data and receive data collected by other wireless detectors through the LoRa module, thereby realizing data sharing between networked wireless detector groups in the goaf, reducing power consumption of long-distance data transmission, and increasing the working time of wireless detectors.

8. The networked monitoring device for spontaneous combustion in goaf of underground coal mines according to claim 1, characterized in that: The information collected by the wireless detector includes the location information, time information, temperature and gas concentration data of the wireless detector. The location information is written into the memory when the wireless detector is installed.

9. A monitoring method for a networked monitoring device for spontaneous combustion in a coal mine goaf, characterized by: The steps include: S1: Charge the wireless detector to full power, and check the operating status of the wireless detector, monitoring host and flat panel display terminal to ensure normal use; S2: Install the monitoring host at the corner of the underground working face close to the air inlet tunnel, connect the power supply cable for power supply; place the flat panel display terminal in the groove on the housing of the monitoring host for monitoring; S3: Install a wireless detector group on the side of the working face close to the goaf in a fixed-end and step-through manner in the middle, specifically as follows: first, install two wireless detectors at the coal wall at the intersection of the critical surface of the air intake tunnel, the return air tunnel and the goaf, which are end face detectors; the number of wireless detectors installed inside the goaf parallel to the working face direction is n=S(L / 30)-1, where the function S(L / 30) represents the quotient of L / 30, L represents the length of the working face, the spacing between the n detectors is 30m, and the spacing between the detector close to the return air tunnel and the end face detector of the return air tunnel is 30m; as the working face advances D=20m in the mining direction, two end face detectors and n internal detectors are installed again, and the spacing between the n detectors is also 30m, but the spacing between the detector close to the air intake tunnel and the end face detector of the air intake tunnel is 30m. In this way, as mining progresses, the networked detector installation in the goaf is completed cyclically; S4: The wireless detector group collects the required parameter data in the goaf and transmits it to the monitoring host, and finally realizes effective monitoring of the spontaneous combustion situation in the goaf through the flat panel display terminal.

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