CN103334791A - Substation-based high atmospheric pressure real-time monitoring system for return air shaft of coal mine - Google Patents
Substation-based high atmospheric pressure real-time monitoring system for return air shaft of coal mine Download PDFInfo
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- CN103334791A CN103334791A CN2013101851783A CN201310185178A CN103334791A CN 103334791 A CN103334791 A CN 103334791A CN 2013101851783 A CN2013101851783 A CN 2013101851783A CN 201310185178 A CN201310185178 A CN 201310185178A CN 103334791 A CN103334791 A CN 103334791A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 54
- 239000003245 coal Substances 0.000 title abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000004891 communication Methods 0.000 claims description 3
- 238000013480 data collection Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 10
- 238000005422 blasting Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
The invention discloses a substation-based high atmospheric pressure real-time monitoring system for a return air shaft of a coal mine, belongs to the technical field of coal mine safety monitoring, and aims at providing a system for real-time monitoring of explosion accidents of the coal mine. The system is characterized in that a steel pipe (2) is pre-buried on a wall of a return air shaft (1) of a coal mine, wherein one end of the steel pipe (2) is communicated with air in the return air shaft (1); the other end of the steel pipe (2) is communicated with a high atmospheric pressure sensor (3) and sealed; a high atmospheric pressure sensor signal line (4) is connected with a monitoring substation (5); the monitoring substation (5) is connected with a data transmission interface (6); the data transmission interface (6) is connected with a monitoring host (8) by a transmission line (7); and the monitoring host (8) monitors and records an atmospheric pressure value signal of the shaft transmitted by the high atmospheric pressure sensor (3) in real time, and records an instantaneous pressure peak and gives an alarm when the instantaneous pressure exceeds an atmosphere.
Description
Technical field
A kind of colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture of the present invention belongs to the coal mine safety monitoring technical field.
Background technology
" coal mining enterprise's safety in production license implementing method " the 13 regulation: high gas, coal and gas outburst mine are equipped gas drainage system and safety monitoring system in accordance with regulations, low gaseous mine equipment gas cutoff instrument, wind-powered electricity generation gas shutting device.
At present, the safety monitoring system that production and operation unit installs is monitored in real time to operation place, colliery gas density, temperature, negative pressure, CO concentration, wind speed, smog, temperature, air door switch etc., and mainly cause the explosion accidents such as gas explosion, coal-dust explosion, priming system blast and gas and dust explosion of heavy losses not monitor in real time to the colliery, blast after the accident in the colliery, accident report mainly relies on phone to report step by step, on call time slowlyer, incur loss through delay the first rescue time of explosion accident.
At present, the outstation of coal mine safety monitoring system and various kinds of sensors mainly are arranged under the coal mine, if hyperbar sensor and the outstation that is connected the hyperbar sensor also are arranged under the coal mine, the shock wave that produces when blasting accident will certainly cause damage with the outstation that is connected the hyperbar sensor and connection line to the hyperbar sensor with high temperature and high pressure gas.That is to say, if the hyperbar sensor is arranged under the coal mine with the outstation that is connected the hyperbar sensor, the hyperbar sensor is damaged the impact air pressure peak value that can not normally monitor in real time and transmit pit shaft internal gas pressure value, produce when blast in the down-hole with the outstation that is connected the hyperbar sensor because of it when blasting accident.
Summary of the invention
The present invention aims to provide a kind of colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture, and a kind of system that the colliery accident of blasting is monitored in real time namely is provided.This system is arranged in ground with hyperbar sensor and outstation, this system hickey and embedded steel tube mechanical connection of hyperbar sensor, namely ventilation system separates fully under all circuit and the coal mine, and just hyperbar sensor, outstation and transmission line do not need to satisfy the prerequisite explosion-proof flame proof requirement of electrical equipment in the particular surroundings under the coal mine; And under coal mine, blast or continuous explosion time, this system can not be damaged because of the high temperature and high pressure gas of explosion wave and generation, the impact air pressure peak value that still can normally monitor in real time and transmit pit shaft internal gas pressure value, produce when blast in the down-hole.
To achieve the above object, the technical solution used in the present invention is: the air in the pre-buried steel pipe on the borehole wall of colliery returnairshaft pit shaft, of this steel pipe and returnairshaft pit shaft communicates, and the other end of this steel pipe and hyperbar sensor are communicated with also sealing; The hyperbar sensor signal lines links to each other with outstation; Outstation links to each other with data transmission interface; Data transmission interface links to each other with monitoring host computer; Monitoring host computer is monitored and record in real time to the atmospheric pressure value signal in the next pit shaft of hyperbar sensor transmissions, and record instantaneous pressure peak value and warning when instantaneous pressure is atmospheric above 1.
In this real-time monitoring system, described pre-buried steel pipe is heavy seamless steel pipe, nominal bore 〉=100mm, wall thickness nominal size 〉=5mm.
In this real-time monitoring system, described hyperbar sensor, the impact air pressure peak value of monitoring in real time and transmitting pit shaft internal gas pressure value, producing when blast in the down-hole; Hyperbar sensor measurement scope is at 0-100 atmospheric pressure.
In this real-time monitoring system, described outstation is a kind of mine data collection and control device, is core with the microprocessor, disposes a plurality of analog quantitys and switching value entrance, connects with sensor, gathers various survey data.
In this real-time monitoring system, described data transmission interface is the hold concurrently intrinsic safety output of ground GENERAL TYPE; Transmission signal between interface and the outstation is the intrinsic safety signal; It is core with the microprocessor, disposes a plurality of RS232 and RS485 interface, carries out data communication with outstation, monitoring host computer.
In this real-time monitoring system, described monitoring host computer is monitored and record in real time to the pit shaft internal gas pressure value signal that the hyperbar sensor transmissions is come, and record instantaneous pressure peak value and warning when instantaneous pressure is atmospheric above 1.
Effect of the present invention is remarkable:
1, this is based on the application of the colliery returnairshaft hyperbar real-time monitoring system of minute standing posture, the colliery accident of blasting is monitored in real time, make the blast information very first time in the accident colliery of blasting be transferred in this colliery returnairshaft hyperbar real-time monitoring system and warning, for the accident rescue gains time.
2, this is based on the application of the colliery returnairshaft hyperbar real-time monitoring system of minute standing posture, because its hyperbar sensor and outstation are arranged in ground, the hickey of hyperbar sensor and embedded steel tube mechanical connection, namely ventilation system separates fully under all circuit and the coal mine, does not need to satisfy the prerequisite explosion-proof flame proof requirement of electrical equipment in the particular surroundings under the coal mine.
3, blast under coal mine or continuous explosion time, this system can not be damaged because of the high temperature and high pressure gas of explosion wave and generation, the impact air pressure peak value that still can normally monitor in real time and transmit pit shaft internal gas pressure value, produce when blast in the down-hole.
Description of drawings
Fig. 1 is the connection diagram based on the colliery returnairshaft hyperbar real-time monitoring system of minute standing posture.
The specific embodiment
Further specify structure of the present invention below in conjunction with accompanying drawing.
Among Fig. 1: 1. returnairshaft pit shaft, 2. steel pipe, 3. hyperbar sensor, 4. hyperbar sensor signal lines, 5. outstation, 6. data transmission interface, 7. transmission line, 8. monitoring host computer.
As shown in the figure, the technical scheme that the colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture that the present invention proposes is taked is: a pre-buried steel pipe 2 on the borehole wall of colliery returnairshaft pit shaft 1, air in one of this steel pipe 2 and the returnairshaft pit shaft 1 communicates, and the other end of this steel pipe 2 and hyperbar sensor 3 are communicated with also sealing; Hyperbar sensor signal lines 4 links to each other with outstation 5; Outstation 5 links to each other with data transmission interface 6; Data transmission interface 6 links to each other with monitoring host computer 8 by transmission line 7; The pit shaft internal gas pressure value signal that 3 transmission of 8 pairs of hyperbar sensors of monitoring host computer come is monitored and record in real time, and record instantaneous pressure peak value is also reported to the police when instantaneous pressure is atmospheric above 1.
In this real-time monitoring system, described pre-buried steel pipe 2 is heavy seamless steel pipe, nominal bore 〉=100mm, wall thickness nominal size 〉=5mm.
In this real-time monitoring system, described hyperbar sensor 3, the impact air pressure peak value of monitoring in real time and transmitting pit shaft internal gas pressure value, producing when blast in the down-hole; The measurement category of hyperbar sensor 3 is selected the PY210 type at 0-100 atmospheric pressure for use as hyperbar sensor 3.
In this real-time monitoring system, described outstation 5 is a kind of mine data collection and control device, is core with the microprocessor, disposes a plurality of analog quantitys and switching value entrance, connects with sensor, gathers various survey data, selects the KJF31 type for use as outstation; Select for use KJF31.2 type signal adapter as one of supporting part of KJF31 type outstation simultaneously, be used for the switching of hyperbar sensor 3 with the outstation 5 of the non-frequency signal output of PY210 type, the curtage signal of PY210 type baroceptor 3 outputs converted to the frequency signal of 200～1000Hz.
In this real-time monitoring system, described data transmission interface 6 is the hold concurrently intrinsic safety output of ground GENERAL TYPE; Transmission signal between data transmission interface 6 and the outstation 5 is the intrinsic safety signal; It is core with the microprocessor, disposes a plurality of RS232 and RS485 interface, carries out data communication with underground substation, monitoring host computer, selects KJJ17 type intelligent data coffret for use as outstation.
In this real-time monitoring system, described monitoring host computer 8 is monitored and record in real time to the pit shaft internal gas pressure value signal that the hyperbar sensor transmissions is come, and record instantaneous pressure peak value and warning when instantaneous pressure is atmospheric above 1.
Be somebody's turn to do the application based on the colliery returnairshaft hyperbar real-time monitoring system of minute standing posture, the colliery accident of blasting is monitored in real time, make the blast information very first time in the accident colliery of blasting be transferred in this colliery returnairshaft hyperbar real-time monitoring system and warning, for the accident rescue gains time.
Claims (6)
1. colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture, it is characterized in that: a pre-buried steel pipe (2) on the borehole wall of colliery returnairshaft pit shaft (1), air in one of this steel pipe (2) and the returnairshaft pit shaft (1) communicates, and the other end of this steel pipe (2) and hyperbar sensor (3) are communicated with also sealing; Hyperbar sensor signal lines (4) links to each other with outstation (5); Outstation (5) links to each other with data transmission interface (6); Data transmission interface (6) links to each other with monitoring host computer (8) by transmission line (7); Monitoring host computer (8) the pit shaft internal gas pressure value signal that transmission comes to hyperbar sensor (3) is monitored and record in real time, and record instantaneous pressure peak value is also reported to the police when instantaneous pressure is atmospheric above 1.
2. the colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture according to claim 1 is characterized in that described pre-buried steel pipe (2) is heavy seamless steel pipe, nominal bore 〉=100mm, wall thickness nominal size 〉=5mm.
3. the colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture according to claim 1 is characterized in that, described hyperbar sensor (3), the impact air pressure peak value of monitoring in real time and transmitting pit shaft internal gas pressure value, producing when blast in the down-hole; The measurement category of hyperbar sensor (3) is selected PY210 at 0-100 atmospheric pressure for use as hyperbar sensor (3).
4. the colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture according to claim 1, it is characterized in that, described outstation (5) is a kind of mine data collection and control device, be core with the microprocessor, dispose a plurality of analog quantitys. and the switching value entrance, connect with sensor, gather various survey data, select the KJF31 type for use as outstation, select for use KJF31.2 type signal adapter as one of supporting part of KJF31 type outstation simultaneously, be used for the switching of hyperbar sensor (3) with the outstation (5) of non-frequency signal output, the curtage signal of PY210 type hyperbar sensor (3) output converted to the frequency signal of 200～1000Hz.
5. the colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture according to claim 1 is characterized in that, described data transmission interface (6) is the hold concurrently intrinsic safety output of ground GENERAL TYPE; Transmission signal between data transmission interface (6) and the outstation (5) is the intrinsic safety signal; It is core with the microprocessor, disposes a plurality of RS232 and RS485 interface, carries out data communication with outstation, monitoring host computer, selects KJJ17 type intelligent data coffret for use as outstation.
6. the colliery returnairshaft hyperbar real-time monitoring system based on minute standing posture according to claim 1, it is characterized in that, described monitoring host computer (8), to hyperbar sensor (3)) the next pit shaft internal gas pressure value signal of transmission is monitored and record in real time, and record instantaneous pressure peak value is also reported to the police when instantaneous pressure is atmospheric above 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185178.3A CN103334791B (en) | 2013-05-11 | 2013-05-11 | A kind of coal mine return air well hyperbar real-time monitoring system based on point standing posture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185178.3A CN103334791B (en) | 2013-05-11 | 2013-05-11 | A kind of coal mine return air well hyperbar real-time monitoring system based on point standing posture |
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| CN103334791A true CN103334791A (en) | 2013-10-02 |
| CN103334791B CN103334791B (en) | 2015-11-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823703A (en) * | 2017-03-13 | 2017-06-13 | 中钢集团马鞍山矿山研究院有限公司 | It is a kind of to eliminate the dehumanization method that returnairshaft mouthful white smoke phenomenon is produced |
| CN106869985A (en) * | 2017-03-13 | 2017-06-20 | 中钢集团马鞍山矿山研究院有限公司 | The underground mine distinguished and admirable dehydrating unit of returnairshaft high temperature saturation and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2640784B1 (en) * | 1988-12-20 | 1991-04-05 | Charbonnages De France | WELL TELEALARM |
| CN101556477A (en) * | 2009-04-28 | 2009-10-14 | 王赛 | Civil blasting material storeroom monitoring substation and sensor being capable of being connected with coal mine safety monitoring system |
| CN201436374U (en) * | 2009-01-20 | 2010-04-07 | 樊铁山 | Coal mine security monitoring system leading to blast shock air pressure explosion-preventing sensor |
| CN201896609U (en) * | 2010-12-08 | 2011-07-13 | 王宁 | Novel underground wireless and mobile safety data collection device |
| CN202065011U (en) * | 2011-06-02 | 2011-12-07 | 邯郸市康创电气有限公司 | Monitoring system for main fans in mine shaft |
| CN102508476A (en) * | 2011-11-04 | 2012-06-20 | 煤炭科学研究总院 | Automatic monitoring device for mining explosion door |
| CN202883010U (en) * | 2012-05-15 | 2013-04-17 | 北京凌天世纪自动化技术有限公司 | Mining rescue wireless video communication system |
| CN203362227U (en) * | 2013-05-11 | 2013-12-25 | 樊铁山 | Substation-based high pressure real-time monitoring system of return air shaft of coal mine |
-
2013
- 2013-05-11 CN CN201310185178.3A patent/CN103334791B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2640784B1 (en) * | 1988-12-20 | 1991-04-05 | Charbonnages De France | WELL TELEALARM |
| CN201436374U (en) * | 2009-01-20 | 2010-04-07 | 樊铁山 | Coal mine security monitoring system leading to blast shock air pressure explosion-preventing sensor |
| CN101556477A (en) * | 2009-04-28 | 2009-10-14 | 王赛 | Civil blasting material storeroom monitoring substation and sensor being capable of being connected with coal mine safety monitoring system |
| CN201896609U (en) * | 2010-12-08 | 2011-07-13 | 王宁 | Novel underground wireless and mobile safety data collection device |
| CN202065011U (en) * | 2011-06-02 | 2011-12-07 | 邯郸市康创电气有限公司 | Monitoring system for main fans in mine shaft |
| CN102508476A (en) * | 2011-11-04 | 2012-06-20 | 煤炭科学研究总院 | Automatic monitoring device for mining explosion door |
| CN202883010U (en) * | 2012-05-15 | 2013-04-17 | 北京凌天世纪自动化技术有限公司 | Mining rescue wireless video communication system |
| CN203362227U (en) * | 2013-05-11 | 2013-12-25 | 樊铁山 | Substation-based high pressure real-time monitoring system of return air shaft of coal mine |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823703A (en) * | 2017-03-13 | 2017-06-13 | 中钢集团马鞍山矿山研究院有限公司 | It is a kind of to eliminate the dehumanization method that returnairshaft mouthful white smoke phenomenon is produced |
| CN106869985A (en) * | 2017-03-13 | 2017-06-20 | 中钢集团马鞍山矿山研究院有限公司 | The underground mine distinguished and admirable dehydrating unit of returnairshaft high temperature saturation and method |
| CN106823703B (en) * | 2017-03-13 | 2019-06-04 | 中钢集团马鞍山矿山研究院有限公司 | A kind of dehumanization method that can eliminate the generation of returnairshaft mouth white smoke phenomenon |
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| CN103334791B (en) | 2015-11-25 |
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Inventor after: Liu Hunju Inventor after: Li Qingyuan Inventor after: Li Baoyuan Inventor after: Miao Yanning Inventor after: Yan Wei Inventor after: Jiang Xiaoqiang Inventor after: Zhang Haiyan Inventor after: Yao Jinguo Inventor after: Fan Xiaoshi Inventor after: Xu Chunhua Inventor after: Fan Tieshan Inventor after: Li Jinpeng Inventor after: Wang Xiaodong Inventor after: Zhao Heping Inventor after: Wang Linghe Inventor after: Liu Qingming Inventor after: Zhang Jianming Inventor after: Zhang Jianbin Inventor after: Bai Guangting Inventor before: Liu Hunju Inventor before: Xu Chunhua Inventor before: Jiang Xiaoqiang Inventor before: Zhang Haiyan Inventor before: Fan Xiaoshi Inventor before: Fan Tieshan Inventor before: Li Jinpeng Inventor before: Wang Xiaodong Inventor before: Zhao Heping Inventor before: Wang Linghe Inventor before: Liu Qingming Inventor before: Zhang Jianming Inventor before: Miao Yanning Inventor before: Yan Wei |
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Free format text: CORRECT: INVENTOR; FROM: LIU HUNJU LI JINPENG WANG XIAODONG ZHAO HEPING WANG LINGHE LIU QINGMING ZHANG JIANMING MIAO YANNING YAN WEI XU CHUNHUA JIANG XIAOQIANG ZHANG HAIYAN FAN XIAOSHI FAN TIESHAN TO: LIU HUNJU LI JINPENG WANG XIAODONG ZHAO HEPING WANG LINGHE LIU QINGMING ZHANG JIANMING ZHANG JIANBIN BAI GUANGTING LI QINGYUAN LI BAOYUAN MIAO YANNING YAN WEI JIANG XIAOQIANG ZHANG HAIYAN YAO JINGUO FAN XIAOSHI XU CHUNHUA FAN TIESHAN |
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Application publication date: 20131002 Assignee: Shanxi Shengzhi Technology Development Co.,Ltd. Assignor: Fan Tieshan Contract record no.: X2023140000022 Denomination of invention: A real-time monitoring system for high air pressure in coal mine return air shaft based on substation Granted publication date: 20151125 License type: Exclusive License Record date: 20231010 |