CN111322104B - Intelligent fire extinguishing device for underground roadway - Google Patents
Intelligent fire extinguishing device for underground roadway Download PDFInfo
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- CN111322104B CN111322104B CN202010118198.9A CN202010118198A CN111322104B CN 111322104 B CN111322104 B CN 111322104B CN 202010118198 A CN202010118198 A CN 202010118198A CN 111322104 B CN111322104 B CN 111322104B
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- 238000012544 monitoring process Methods 0.000 claims abstract description 66
- 238000002485 combustion reaction Methods 0.000 claims abstract description 41
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 41
- 239000003245 coal Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 6
- 238000004868 gas analysis Methods 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 21
- 239000007924 injection Substances 0.000 claims description 21
- 239000003063 flame retardant Substances 0.000 claims description 8
- 230000005855 radiation Effects 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 206010063385 Intellectualisation Diseases 0.000 abstract description 2
- 230000006386 memory function Effects 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Fire Alarms (AREA)
Abstract
The utility model provides an intelligent fire extinguishing device for underground tunnel, includes monitoring system, alarm system, fire extinguishing systems and control system, and monitoring system installs in tunnel roof middle part, and fire extinguishing systems installs on the upper portion of two sides in the tunnel, and control system passes through control cable and is connected respectively with monitoring system, fire extinguishing systems and alarm system, and monitoring system is used for the temperature variation condition of real-time supervision underground tunnel coal wall to judge whether there is the emergence of spontaneous combustion phenomenon simultaneously. The invention adopts a temperature measurement method and a gas analysis method to comprehensively judge whether spontaneous combustion occurs or not, improves the accuracy, has the orientation memory function, can accurately judge the occurring area, integrates monitoring and fire extinguishing into a whole, can realize accurate fire extinguishing in a short time, and further embodies the intellectualization of the device. The invention integrates the monitoring and prevention of coal spontaneous combustion, and realizes accurate, rapid and intelligent fire extinguishing from multiple aspects, thereby reducing economic loss and ensuring the safety of underground workers.
Description
Technical Field
The invention belongs to the technical field of mining equipment, and particularly relates to an intelligent fire extinguishing device for an underground roadway.
Background
The fire disaster is one of five major disasters of coal mines and occupies a considerable proportion of coal disasters in China. The spontaneous combustion condition of coal is ubiquitous in most coal mines in China, the spontaneous combustion phenomenon of coal is difficult to detect under the traditional coal mine, a large amount of high-quality coal mine resources are lost every year, and certain threat is caused to the safety of underground production. The number of mines with spontaneous combustion coal mines in China accounts for 56 percent of the total number of the mines; the fire caused by spontaneous combustion of coal accounts for 90% of the total number of mine fires. At present, no fire extinguishing device is arranged in a roadway under a coal mine, fire extinguishing is carried out after the fire occurs, great difficulty is caused, great danger is realized, and huge cost is also paid out.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an underground roadway intelligent fire extinguishing device which can monitor underground flame and extinguish the flame in time.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an intelligent fire extinguishing device for underground tunnel, includes monitoring system, alarm system, fire extinguishing systems and control system, and monitoring system installs in tunnel roof middle part, and fire extinguishing systems installs on the upper portion of two sides in the tunnel, and control system passes through control cable and is connected respectively with monitoring system, fire extinguishing systems and alarm system, and monitoring system is used for the temperature variation condition of real-time supervision underground tunnel coal wall to judge whether there is the emergence of spontaneous combustion phenomenon simultaneously.
The monitoring system combines a temperature measurement method and a gas analysis method, and comprises a thermal infrared imager, a beam tube monitoring system and an orientation discriminator, wherein the thermal infrared imager receives energy of infrared radiation in a space and converts the energy into an electric signal, the signal is transmitted to a control system, the control system transmits the signal to ground monitoring equipment on the ground to obtain a gray image which can be directly watched, and a ground dispatching room can see the change of the temperature of an underground monitoring point in real time, so that the real-time monitoring of the temperature of the coal wall of the roadway is realized; comprehensively judging whether the spontaneous combustion phenomenon occurs or not by the concentration of CO in the gas collected by the beam tube monitoring system and the critical temperature and the duration of spontaneous combustion of the coal monitored by infrared radiation received by the thermal infrared imager; if the spontaneous combustion phenomenon occurs, the direction of the spontaneous combustion point can be obtained in the image of the thermal infrared imager, and the direction identifier transmits the direction information to the control system.
The control system receives a spontaneous combustion signal sent by the monitoring system, sends a command to the alarm system, and the alarm system reminds the underground workers of spontaneous combustion in the underground workers in a ringing and/or luminous mode, transmits the signal to the ground dispatching room and timely arranges the workers to timely handle and pay attention to safety.
Fire extinguishing systems main action is put out a fire to the region of spontaneous combustion, fire extinguishing systems includes the fire extinguisher, injection apparatus, electric valve and driving motor, driving motor and fire extinguisher are all installed on the stock or the anchor rope of two sides in the tunnel, the injection orifice of fire extinguisher passes through high-pressure hose with injection apparatus's import and is connected, injection apparatus installs on driving motor's power take off, electric valve is used for controlling injection apparatus and sprays the fire retardant, position information according to the control system transmission drives injection apparatus and rotates corresponding position, thereby electric valve control injection apparatus opens and sprays the fire retardant and reach preliminary fire extinguishing.
By adopting the technical scheme, the invention has the following beneficial effects:
1) influenced by signal factors in an underground roadway, the monitoring system, the alarm system, the fire extinguishing system, the intelligent chip and the ground monitoring equipment are connected in a wired connection mode. The monitoring system can be used for punching and installing the tunnel roof, and the beam tubes are laid along the roof. The fire extinguishing system is positioned on two sides of the roadway, is convenient for fire extinguishing, can be fixed on the anchor cable, and can be adjusted according to different roadway conditions.
2) Because the fire extinguishing range of a single intelligent fire extinguishing device is limited, a plurality of intelligent fire extinguishing devices can be connected in series in a roadway, so that the monitoring effect of the temperature of the whole roadway is more accurate, and the plurality of intelligent fire extinguishing devices can be laid at equal intervals and can also be adjusted according to the roadways under different conditions. A plurality of monitoring systems are connected in series to be accessed to the control system, a plurality of fire extinguishing systems are connected in series to be accessed to the control system, a plurality of alarm systems are connected in series to be accessed to the control system, and finally the control system transmits data to ground monitoring equipment.
3) When the underground tunnel has no spontaneous combustion phenomenon, the monitoring system receives and converts the energy of infrared radiation in the space, transmits the signal to ground monitoring equipment through a control heart state, and displays a gray image which is directly watched to monitor the temperature of the tunnel coal wall in real time; when the spontaneous combustion phenomenon occurs in the underground roadway, the monitoring system monitors the spontaneous combustion phenomenon and transmits a direction signal to the control system, and the control system transmits the signal to the alarm system, the fire extinguishing system and the ground display equipment. Alarm system reminds the staff to pay attention to safety through the ringing, and extinguishing system receives the position signal, sprays the fire retardant in corresponding position and carries out preliminary fire extinguishing. And the ground monitoring equipment receives the spontaneous combustion signal of the control system and can take corresponding measures to further extinguish the fire.
In conclusion, the invention comprehensively judges whether spontaneous combustion occurs or not by combining a temperature measurement method and a gas analysis method, improves the accuracy, can accurately judge the occurring area by the direction memory function, integrates monitoring and fire extinguishing into a whole, can realize accurate fire extinguishing in a short time, and further embodies the intellectualization of the device. The invention integrates the monitoring and prevention of coal spontaneous combustion, and realizes accurate, rapid and intelligent fire extinguishing from multiple aspects, thereby reducing economic loss and ensuring the safety of underground workers.
Drawings
FIG. 1 is a schematic view of the main components of the present invention installed in a roadway;
fig. 2 is a schematic diagram of the control principle of the present invention.
Detailed Description
As shown in fig. 1-2, the intelligent fire extinguishing device for the underground roadway comprises a monitoring system 1, an alarm system 2, a fire extinguishing system 3 and a control system 4, wherein the monitoring system 1 is installed in the middle of a roadway roof 5, the fire extinguishing system 3 and the alarm system 2 are installed on the upper portions of two sides 6 of the roadway, the control system 4 is respectively connected with the monitoring system 1, the fire extinguishing system 3 and the alarm system 2 through control cables, and the monitoring system 1 is used for monitoring the temperature change condition of the coal wall of the underground roadway in real time and judging whether a spontaneous combustion phenomenon occurs.
The monitoring system 1 combines a temperature measurement method and a gas analysis method. The underground tunnel environment is complex, and the purity of the collected gas cannot be completely guaranteed, so that the main body is a temperature measurement method, and a gas analysis method is used as an auxiliary judgment basis to increase the reliability of the whole system for monitoring the spontaneous combustion of the coal; the monitoring system 1 comprises a thermal infrared imager, a beam tube monitoring system 1 and an orientation discriminator, the thermal infrared imager receives energy of infrared radiation in a space and converts the energy into an electric signal, the signal is transmitted to the control system 4, the control system 4 transmits the signal to the ground monitoring equipment 9 on the ground to obtain a gray image which can be directly watched, and the ground dispatching room can see the temperature change of the underground monitoring point in real time, so that the real-time monitoring of the temperature of the coal wall of the tunnel is realized; comprehensively judging whether the spontaneous combustion phenomenon occurs or not by the concentration of CO in the gas collected by the beam tube monitoring system 1 and the critical temperature and the duration of spontaneous combustion of the monitored coal by receiving infrared radiation by the thermal infrared imager; if the spontaneous combustion phenomenon occurs, the direction of the spontaneous combustion point can be obtained in the image of the thermal infrared imager, and the direction identifier transmits the direction information to the control system 4.
The control system 4 receives the spontaneous combustion signal sent by the monitoring system 1, the control system 4 sends a command to the alarm system 2, the alarm system 2 reminds the underground workers of spontaneous combustion at the position in a ringing and/or luminous mode, and transmits the signal to a ground dispatching room, so that the workers can be timely arranged to deal with and pay attention to safety.
Fire extinguishing system 3 main function is put out a fire to the region of spontaneous combustion, fire extinguishing system 3 includes the fire extinguisher, injection apparatus, electric valve and driving motor, driving motor and fire extinguisher are all installed on anchor rod or anchor rope 7 of two sides 6 in the tunnel, the injection port of fire extinguisher passes through high-pressure hose with injection apparatus's import and is connected, injection apparatus installs on driving motor's power take off, electric valve is used for controlling injection apparatus to spray the fire retardant, the position information according to control system 4 transmissions drives injection apparatus and rotates corresponding position, thereby electric valve control injection apparatus opens and sprays the fire retardant and reach preliminary fire extinguishing.
The invention has the following beneficial effects:
1) influenced by signal factors in the underground roadway 8, the monitoring system 1, the alarm system 2, the fire extinguishing system 3 and the ground monitoring equipment 9 are all connected in a wired connection mode. The monitoring system 1 can be used for punching and installing the roadway roof 5, and the beam tubes are laid along the roof. The fire extinguishing system 3 is positioned on two sides 6 of the roadway, is convenient for fire extinguishing, can be fixed on the anchor cable, and can be adjusted according to different conditions of the roadway 8.
2) Because the fire extinguishing range of a single intelligent fire extinguishing device is limited, a plurality of intelligent fire extinguishing devices can be connected in series in the roadway 8, so that the monitoring effect of the temperature of the whole roadway 8 is more accurate, and the plurality of intelligent fire extinguishing devices can be laid at equal intervals and can also be adjusted according to the roadway 8 under different conditions. A plurality of monitoring systems 1 are connected in series to be connected with a control system 4, a plurality of fire extinguishing systems 3 are connected in series to be connected with the control system 4, a plurality of alarm systems 2 are connected in series to be connected with the control system 4, and finally the control system 4 transmits data to ground monitoring equipment 9.
3) When the underground tunnel 8 has no spontaneous combustion phenomenon, the monitoring system 1 receives and converts the energy of infrared radiation in the space, transmits the signal to the ground monitoring equipment 9 through a control heart state, and displays a gray image which is directly watched to monitor the temperature of the coal wall of the tunnel 8 in real time; when the spontaneous combustion phenomenon occurs in the underground roadway 8, the monitoring system 1 monitors the spontaneous combustion phenomenon and transmits a direction signal to the control system 4, and the control system 4 transmits a signal to the alarm system 2, the fire extinguishing system 3 and the ground display equipment. Alarm system 2 reminds the staff to pay attention to safety through the ringing, and extinguishing system 3 accepts the position signal, sprays the fire retardant in corresponding position and carries out preliminary fire extinguishing. The ground monitoring equipment 9 receives the self-ignition signal of the control system 4 and can take corresponding measures to further extinguish the fire.
The ground monitoring equipment 9, the monitoring system 1, the alarm system 2, the fire extinguishing system 3 and the control system 4 in the invention are all the existing mature technologies, and the specific construction is not described again.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (3)
1. The utility model provides an intelligent extinguishing device in underworkings which characterized in that: the monitoring system is arranged in the middle of a top plate of a roadway, the fire extinguishing system is arranged on the upper parts of two sides of the roadway, the control system is respectively connected with the monitoring system, the fire extinguishing system and the alarm system through control cables, and the monitoring system is used for monitoring the temperature change condition of a coal wall of the underground roadway in real time and judging whether spontaneous combustion occurs or not;
fire extinguishing systems main action is put out a fire to the region of spontaneous combustion, fire extinguishing systems includes the fire extinguisher, injection apparatus, electric valve and driving motor, driving motor and fire extinguisher are all installed on the stock or the anchor rope of two sides in the tunnel, the injection orifice of fire extinguisher passes through high-pressure hose with injection apparatus's import and is connected, injection apparatus installs on driving motor's power take off, electric valve is used for controlling injection apparatus and sprays the fire retardant, position information according to the control system transmission drives injection apparatus and rotates corresponding position, thereby electric valve control injection apparatus opens and sprays the fire retardant and reach preliminary fire extinguishing.
2. The intelligent fire extinguishing device for the underground roadway according to claim 1, characterized in that: the monitoring system combines a temperature measurement method and a gas analysis method, and comprises a thermal infrared imager, a beam tube monitoring system and an orientation discriminator, wherein the thermal infrared imager receives energy of infrared radiation in a space and converts the energy into an electric signal, the signal is transmitted to a control system, the control system transmits the signal to ground monitoring equipment on the ground to obtain a gray image which can be directly watched, and a ground dispatching room can see the change of the temperature of an underground monitoring point in real time, so that the real-time monitoring of the temperature of the coal wall of the roadway is realized; comprehensively judging whether the spontaneous combustion phenomenon occurs or not by the concentration of CO in the gas collected by the beam tube monitoring system and the critical temperature and the duration of spontaneous combustion of the coal monitored by infrared radiation received by the thermal infrared imager; if the spontaneous combustion phenomenon occurs, the direction of the spontaneous combustion point can be obtained in the image of the thermal infrared imager, and the direction identifier transmits the direction information to the control system.
3. The intelligent fire extinguishing device for the underground roadway according to claim 2, characterized in that: the control system receives a spontaneous combustion signal sent by the monitoring system, sends a command to the alarm system, and the alarm system reminds the underground workers of spontaneous combustion in the underground workers in a ringing and/or luminous mode, transmits the signal to the ground dispatching room and timely arranges the workers to timely handle and pay attention to safety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010118198.9A CN111322104B (en) | 2020-02-26 | 2020-02-26 | Intelligent fire extinguishing device for underground roadway |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010118198.9A CN111322104B (en) | 2020-02-26 | 2020-02-26 | Intelligent fire extinguishing device for underground roadway |
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| Publication Number | Publication Date |
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| CN111322104A CN111322104A (en) | 2020-06-23 |
| CN111322104B true CN111322104B (en) | 2021-08-06 |
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| CN202010118198.9A Active CN111322104B (en) | 2020-02-26 | 2020-02-26 | Intelligent fire extinguishing device for underground roadway |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3900973C1 (en) * | 1989-01-14 | 1990-06-13 | Heinz Dipl.-Ing. 4390 Gladbeck De Hoelter | Filter unit with progressively responding warning and extinguishing device |
| CN202031627U (en) * | 2010-12-17 | 2011-11-09 | 神华集团有限责任公司 | A coal seam spontaneous combustion control system |
| CN104083841A (en) * | 2014-07-25 | 2014-10-08 | 电子科技大学 | Fire prevention and control system and method for mine and underground pipe network |
| CN107246281A (en) * | 2016-10-21 | 2017-10-13 | 中国矿业大学(北京) | Mine self caused fire monitoring early-warning system |
| CN108915776A (en) * | 2018-08-07 | 2018-11-30 | 天地（常州）自动化股份有限公司 | Goaf coal spontaneous combustion temperature field real-time visual monitoring device, system and method |
| CN208280986U (en) * | 2018-02-23 | 2018-12-25 | 中国矿业大学(北京) | mine explosion monitoring system based on infrared image monitoring device |
| CN109838280A (en) * | 2017-11-27 | 2019-06-04 | 菏泽海诺知识产权服务有限公司 | A kind of coal mine gas prewarning processing system |
| CN110425007A (en) * | 2019-07-29 | 2019-11-08 | 宿州市金鼎安全技术股份有限公司 | A kind of coal mine natural fire monitoring device based on fiber-optic grating sensor |
-
2020
- 2020-02-26 CN CN202010118198.9A patent/CN111322104B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3900973C1 (en) * | 1989-01-14 | 1990-06-13 | Heinz Dipl.-Ing. 4390 Gladbeck De Hoelter | Filter unit with progressively responding warning and extinguishing device |
| CN202031627U (en) * | 2010-12-17 | 2011-11-09 | 神华集团有限责任公司 | A coal seam spontaneous combustion control system |
| CN104083841A (en) * | 2014-07-25 | 2014-10-08 | 电子科技大学 | Fire prevention and control system and method for mine and underground pipe network |
| CN107246281A (en) * | 2016-10-21 | 2017-10-13 | 中国矿业大学(北京) | Mine self caused fire monitoring early-warning system |
| CN109838280A (en) * | 2017-11-27 | 2019-06-04 | 菏泽海诺知识产权服务有限公司 | A kind of coal mine gas prewarning processing system |
| CN208280986U (en) * | 2018-02-23 | 2018-12-25 | 中国矿业大学(北京) | mine explosion monitoring system based on infrared image monitoring device |
| CN108915776A (en) * | 2018-08-07 | 2018-11-30 | 天地（常州）自动化股份有限公司 | Goaf coal spontaneous combustion temperature field real-time visual monitoring device, system and method |
| CN110425007A (en) * | 2019-07-29 | 2019-11-08 | 宿州市金鼎安全技术股份有限公司 | A kind of coal mine natural fire monitoring device based on fiber-optic grating sensor |
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| CN111322104A (en) | 2020-06-23 |
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