CN101368484A - Double-gas path centralized oxygen supply life saving system of embedded type mine refuge underground chamber - Google Patents
Double-gas path centralized oxygen supply life saving system of embedded type mine refuge underground chamber Download PDFInfo
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- CN101368484A CN101368484A CNA2008101368689A CN200810136868A CN101368484A CN 101368484 A CN101368484 A CN 101368484A CN A2008101368689 A CNA2008101368689 A CN A2008101368689A CN 200810136868 A CN200810136868 A CN 200810136868A CN 101368484 A CN101368484 A CN 101368484A
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Abstract
The invention provides an embedded double-line central oxygen supply lifesaving system for a mine refuge chamber. An embedded mine refuge chamber lifesaving cabin body is arranged inside a mine chamber; the cabin body is a sealed inflated flame-retarding double-layer lifesaving cabin body; a compressed air pipeline port running through the cabin body and a communication data line interface are arranged on the cabin body; and a double-line central oxygen supply lifesaving system, a carbon dioxide absorber, a power carrier communication device, a UPS power source, an RFID personnel identification system, a video safety monitoring system, an automatic toxic and harmful gas detector, a sealed physiological excretion discharger and a survival food storage cabinet are arranged inside the cabin body. The double-line central oxygen supply lifesaving system is connected with central air and oxygen supplying masks and is connected with the compressed air pipeline port. The power carrier communication device is connected with the communication data line interface. The embedded double-line central oxygen supply lifesaving system can provide a shelter, oxygen and living spaces for the mineworkers in the case of mine disasters and can have the functions of saving life and providing refuge; meanwhile, the embedded double-line central oxygen supply lifesaving system is provided with a double-line oxygen supply system.
Description
(1) technical field
The present invention relates to a kind of lifesaving appliance, be specifically related to a kind of embedded type mine chamber lifesaving technology.
(2) background technology
At present, mine safety has more and more caused people's attention, in when, inevitably mine accident taking place, need especially a kind of can play take refuge, the equipment of lifesaving effect, but the chamber in mine they do not possess isolatedly take refuge, the function of oxygen supply.Therefore people urgently wishes to have a kind of can possess isolatedly take refuge, the equipment lifesaving fully of oxygen supply function.
(3) summary of the invention
The object of the present invention is to provide a kind ofly can when mine generation mine disaster, can take refuge for the miner provides, the space of oxygen supply existence, under the environment that does not have electricity, anaerobic, can normally bring into play its special function, and be provided with the two gas circuit concentrated oxygen supply life saving systems of embedded type mine refuge underground chamber of two-way oxygen system.
The object of the present invention is achieved like this: it is for being installed on embedded type mine refuge underground chamber survival capsule body in mine chamber inside, the cabin body is fire-retardant sealing double-decker air filling type survival capsule body, the cabin body is provided with air line interface and the communication data line interface that passes the cabin body, its inside is provided with two gas circuit concentrated oxygen supply life saving systems, absorption unit of dioxide carbon, the power carrier communication machine, ups power, the RFID Personnel Authentication Identification System, video safety monitoring system and toxic and harmful automatic tester, sealing physiology eductor and existence food storage tank, two gas circuit concentrated oxygen supply life saving systems are connected with air, oxygen concentrated oxygen supply face shield, and connecting the air line interface, the power carrier communication machine connects the communication data line interface.
The present invention also has some technical characterictics like this:
1, described cabin body is inflatable double-layered Sealed sandwich structure, and inside is provided with arch survival capsule body support frame, and the cabin body is provided with refuge chamber cabin body air-filled pore and refuge chamber survival capsule outlet valve;
2, described cabin body is provided with the double-layer seal door, is provided with pressure-sealing zipper and watch window on hermatic door;
3, described pair of gas circuit concentrated oxygen supply life saving system comprises the mine compressed air oxygen supply, compressed oxygen cylinder oxygen supply two-way branch road, mine compressed air oxygen supply branch road comprises the mine compressed air tube inlet that connects successively, the air line pressure meter, the pressure ventilation pipe valve, pressure reducer and oxygen supply branch road, compressed oxygen cylinder oxygen supply branch road comprises one group of compressed oxygen cylinder, be arranged on the oxygen gauge on the compressed oxygen cylinder, oxygen cylinder switch and oxygen supply branch road, the oxygen supply branch road is provided with gas distributor, oxygen pipeline, pressure reducer and oxygen pipeline switch, oxygen pipeline connects air respectively, oxygen concentrated oxygen supply face shield;
4, described oxygen pipeline end is provided with absorption unit of dioxide carbon
5, described refuge chamber cabin body air-filled pore and refuge chamber survival capsule outlet valve are separately positioned on body both sides, cabin, and RFID Personnel Authentication Identification System, video safety monitoring system and toxic and harmful automatic tester are arranged near the double-layer seal door.
The present invention is in order to overcome the deficiency of existing mine chamber function list, a kind of multi-functional shelter and lifesaving of embedded type mine chamber cabin of entirely new kind is provided, it can be taken refuge for the miner provides when mine generation mine disaster, the space of oxygen supply existence, under the environment that does not have electricity, anaerobic, can normally bring into play its special function, and be provided with the two-way oxygen system, air line oxygen supply and compressed oxygen oxygen supply have great using value.
The technical solution adopted for the present invention to solve the technical problems is: in existing mine chamber inside by establishing the multi-functional shelter and lifesaving of embedded type mine chamber cabin, the outside is provided with hermatic door and watch window, air line is connected with survival capsule is inner, the communication data circuit is connected with survival capsule inside, inside is provided with survival capsule two-way oxygen system, and CO
2Clarifier is at any time to personnel's oxygen supply and the absorption CO of taking refuge
2Purify the air in the survival capsule, in the top of survival capsule, be provided with metallic support every 0.8 centimeter, its survival capsule rear wall is provided with the security monitoring camera, RFID Personnel Authentication Identification System and toxic and harmful automatic tester and survival capsule body inflation inlet, cabin body outlet valve, at any time the survival capsule internal gas pressure is carried out automatic Regulation, casing top at its two-way concentrated oxygen supply is provided with the power carrier communication machine, the opposite side casing is provided with existence food storage tank, be provided with sealing physiology eductor in its survival capsule left side, the characteristics of the multi-functional shelter and lifesaving of this embedded type mine chamber cabin maximum are, do not need the outside to provide condition to take refuge, the Waiting space of oxygen supply existence, not influenced by Minepit environment, the utilization of whole Waiting space rationally can be held the existence oxygen supply of taking refuge of many numbers.Applied range, effective.
The present invention is double-deck inflatable structures, helps removing moving, and is easy for installation, and utilizes gas filling double-layer seal interlayer to support to the utilized space that sealing is taken refuge.The present invention simultaneously is embedded, and for being installed in the mine chamber inside sudden and violent wall of setting up defences in addition, explosion-proof effect is remarkable, and fire prevention, waterproof, compare with survival capsule is installed on the track, do not take the space of mine laneway, be not subjected to the impact of explosion wave, remove easy for installationly, removable, effect is good.
(4) description of drawings
Fig. 1 is a three-dimensional structure diagram of the present invention;
Fig. 2 is a power carrier communication circuit system schematic diagram;
Fig. 3 is two gas circuit concentrated oxygen supply life saving system schematic diagrams.
(5) specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing:
In conjunction with Fig. 1, present embodiment in existing mine chamber inside by establishing the multi-functional shelter and lifesaving of embedded type mine chamber cabin body 5,5 are provided with double-layer seal door 4 on the survival capsule body, on hermatic door 4, be provided with pressure-sealing zipper 3, on hermatic door 4, be provided with watch window 2, on the sealed compartment body, be provided with the air line interface 14, communication data line interface 15 and the survival capsule outlet valve 17 that pass the sealed compartment body, be provided with two-way oxygen supply and CO in inside, embedded type mine chamber multi-functional shelter and lifesaving cabin
2Purified gas system 11, power carrier communication machine 12, ups power 13, RFID Personnel Authentication Identification System 7, video safety monitoring system 8, toxic and harmful automatic tester 1, survival capsule body support frame 6, sealing physiology eductor 16, existence food storage tank 10, survival capsule body air-filled pore 9 and air oxygen concentrated oxygen supply face shield 18.
In conjunction with Fig. 2, Fig. 2 is the schematic diagram of power carrier.The 220V civil power provides 6V dc source for this machine after B2 transformation, 1N4001 diode rectification, filtering, voltage stabilizing.The core parts IC2 of circuit is a phaselocked loop audio decoder.Its 3. pin be signal input part.5., 6. the W1 of pin, C determine its intrinsic frequency f0=100KHz.When its when 3. the signal voltage of pin input falls in the pullin banwidth of intrinsic frequency f0 greater than threshold voltage and frequency, 8. pin can saltus step be a logic low.If 3. pin input by the signal of voice modulation, the 1. audio signal of pin output demodulation then.Conversely, if 2. audio signal of pin input, so 5. just to export one be the modulation signal at center with intrinsic frequency f0 to pin.B1 is two-four line balance converters, when F1, F2 end sends signal, can receive in G1, G2 or H1, H2 termination, but when G1, G2 or H1, H2 end send signal, can receive in F1, F2 termination, and four relative lines not receive at two ends in addition.When this confidential calling talkback, press the AN several seconds (can continuously several times), J1 gets, the IC1 power supply is connected in contact J1a adhesive, the multivibrator work that IC1 and peripheral cell thereof constitute, 3. pin output audio signal adds to the 2. pin of IC2 through J1b, normally closed interlock J1d disconnects simultaneously, and SP does not send ringing tone.The 5. pin of IC2 is exported modulated 100KHz ring carrier wave, and G1, the G2 end through T2 adds to B1 is coupled to F1, F2 end and sends.Unclamp AN, send bell signal and disappear, circuit is in wait state again.
When on the power line incoming call being arranged, the 100KHz modulated carrier is coupled to H1, H2 end by F1, F2 end, through T1 carrier wave being carried out frequency-selecting amplifies, signal after the amplification is divided into two-way, the one road 3. pin of delivering to IC2 is deciphered, another road after rectification for T5 provides bias current, the T5 conducting, J3 contact J3a adhesive, IC2 gets electric work.When the signal interpretation of 3. pin was effective, 8. the pin saltus step ended for low level T3, and the M point is high level, triggered controllable silicon SCR, and IC1 gets electric, by its 3. the ring audio frequency of pin output promote the SP sounding.T4 conducting simultaneously, the discharge circuit power supply is connected in J2 contact J2a adhesive.This moment, those who answer was as long as be allocated to B end (should place the A end at ordinary times) with K switch by the A end, and IC1 dead electricity the tinkle of bells disappears.The carrier signal of outside line can be deciphered through IC2, and 1. pin output voice signal amplifies the interesting to listen to tube of pusher sounding through IC3-b.The microphone audio signal of this machine is amplified by IC3-a after the IC2 coding sends.
In conjunction with Fig. 3, embedded type mine refuge underground chamber survival capsule body 5 is fire-retardant sealing double-decker air filling type survival capsule body, the cabin body is provided with air line interface 14 and the communication data line interface 15 that passes the cabin body, its inside is provided with two gas circuit concentrated oxygen supply life saving systems 11, absorption unit of dioxide carbon 38, power carrier communication machine 12, ups power 13, RFID Personnel Authentication Identification System 7, video safety monitoring system 8 and toxic and harmful automatic tester 1, sealing physiology eductor 16 and existence food storage tank 10, the lifesaving of two gas circuit concentrated oxygen supply is that 11 systems are connected with air, oxygen concentrated oxygen supply face shield 18, and connecting air line interface 14, power carrier communication machine 12 connects communication data line interface 15.Cabin body 5 is inflatable double-layered Sealed sandwich structure, and inside is provided with arch survival capsule body support frame 6, and the cabin body is provided with refuge chamber cabin body air-filled pore 9 and refuge chamber survival capsule outlet valve 17; Cabin body 5 is provided with double-layer seal door 4, is provided with pressure-sealing zipper 3 and watch window 2 on hermatic door 4; Two gas circuit concentrated oxygen supply life saving systems 11 comprise the mine compressed air oxygen supply, compressed oxygen cylinder oxygen supply two-way branch road, mine compressed air oxygen supply branch road comprises the mine compressed air tube inlet 21 that connects successively, air line pressure meter 22, pressure ventilation pipe valve 23, pressure reducer 24 and oxygen supply branch road 25, compressed oxygen cylinder oxygen supply branch road comprises one group of compressed oxygen cylinder 26, be arranged on the oxygen gauge 27 on the compressed oxygen cylinder 26, oxygen cylinder switch 28 and oxygen supply branch road 30, oxygen supply branch road 30 is provided with gas distributor 29, oxygen pipeline, pressure reducer 31 and oxygen pipeline switch 32, oxygen pipeline 30 connects air respectively, oxygen concentrated oxygen supply face shield 33-37; The oxygen pipeline end is provided with absorption unit of dioxide carbon 38.Refuge chamber cabin body air-filled pore and refuge chamber survival capsule outlet valve are separately positioned on body both sides, cabin, and RFID Personnel Authentication Identification System, video safety monitoring system and toxic and harmful automatic tester are arranged near the double-layer seal door.
Present embodiment is for being provided with the multi-functional shelter and lifesaving of embedded type mine chamber cabin in existing mine chamber inside, inside is provided with two-way oxygen system, electricity upright carrier communication system, toxic and harmful automatic tester and RFID Personnel Authentication Identification System video security monitoring camera system, is provided with CO in its inside, cabin
2Clarifier, sealing physiology eductor are provided with existence food storage tank in the survival capsule, personnel in the mine that waits for rescue have been had the guarantee of existence, the very big booster action that will play the rescue work under the particular surroundings.
Claims (6)
1. two gas circuit concentrated oxygen supply life saving systems of an embedded type mine refuge underground chamber, it is characterized in that it is to be installed on embedded type mine refuge underground chamber survival capsule body in mine chamber inside, the cabin body is fire-retardant sealing double-decker air filling type survival capsule body, the cabin body is provided with air line interface and the communication data line interface that passes the cabin body, its inside is provided with two gas circuit concentrated oxygen supply life saving systems, absorption unit of dioxide carbon, the power carrier communication machine, ups power, the RFID Personnel Authentication Identification System, video safety monitoring system and toxic and harmful automatic tester, sealing physiology eductor and existence food storage tank, two gas circuit concentrated oxygen supply life saving systems are connected with air, oxygen concentrated oxygen supply face shield, and connecting the air line interface, the power carrier communication machine connects the communication data line interface.
2. the two gas circuit concentrated oxygen supply life saving systems of embedded type mine refuge underground chamber according to claim 1, it is characterized in that described cabin body is inflatable double-layered Sealed sandwich structure, inside is provided with arch survival capsule body support frame, and the cabin body is provided with refuge chamber cabin body air-filled pore and refuge chamber survival capsule outlet valve.
3. the two gas circuit concentrated oxygen supply life saving systems of embedded type mine refuge underground chamber according to claim 1 and 2 is characterized in that described cabin body is provided with the double-layer seal door, is provided with pressure-sealing zipper and watch window on hermatic door.
4. the two gas circuit concentrated oxygen supply life saving systems of embedded type mine refuge underground chamber according to claim 1, it is characterized in that described pair of gas circuit concentrated oxygen supply life saving system comprises the mine compressed air oxygen supply, compressed oxygen cylinder oxygen supply two-way branch road, mine compressed air oxygen supply branch road comprises the mine compressed air tube inlet that connects successively, the air line pressure meter, the pressure ventilation pipe valve, pressure reducer and oxygen supply branch road, compressed oxygen cylinder oxygen supply branch road comprises one group of compressed oxygen cylinder, be arranged on the oxygen gauge on the compressed oxygen cylinder, oxygen cylinder switch and oxygen supply branch road, the oxygen supply branch road is provided with gas distributor, oxygen pipeline, pressure reducer and oxygen pipeline switch, oxygen pipeline connects air respectively, oxygen concentrated oxygen supply face shield.
5. the two gas circuit concentrated oxygen supply life saving systems of embedded type mine refuge underground chamber according to claim 4 is characterized in that described oxygen pipeline end is provided with absorption unit of dioxide carbon.
6. the two gas circuit concentrated oxygen supply life saving systems of embedded type mine refuge underground chamber according to claim 2, it is characterized in that described refuge chamber cabin body air-filled pore and refuge chamber survival capsule outlet valve are separately positioned on body both sides, cabin, RFID Personnel Authentication Identification System, video safety monitoring system and toxic and harmful automatic tester are arranged near the double-layer seal door.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101368689A CN101368484A (en) | 2008-08-01 | 2008-08-01 | Double-gas path centralized oxygen supply life saving system of embedded type mine refuge underground chamber |
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|---|---|---|---|
| CNA2008101368689A CN101368484A (en) | 2008-08-01 | 2008-08-01 | Double-gas path centralized oxygen supply life saving system of embedded type mine refuge underground chamber |
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| CN101368484A true CN101368484A (en) | 2009-02-18 |
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| CNA2008101368689A Pending CN101368484A (en) | 2008-08-01 | 2008-08-01 | Double-gas path centralized oxygen supply life saving system of embedded type mine refuge underground chamber |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852087A (en) * | 2010-06-25 | 2010-10-06 | 盛健 | Safety guarantee channel for boring operation staff |
| CN102011608A (en) * | 2010-12-15 | 2011-04-13 | 东南大学 | Air cooling, dehumidifying and purifying system and method |
| CN102071965A (en) * | 2011-02-18 | 2011-05-25 | 三一重型装备有限公司 | Mine disaster life-saving system and method |
| CN102080566A (en) * | 2011-02-18 | 2011-06-01 | 三一重型装备有限公司 | Refuge cave chamber structure |
| CN102108876A (en) * | 2011-01-18 | 2011-06-29 | 辽宁卓异科技有限公司 | Temperature-reducing and dehumidifying device for mine refuge underground chambers |
| CN102182503A (en) * | 2011-04-08 | 2011-09-14 | 南京航空航天大学 | Automatic control equipment and automatic control method for micro-positive pressure maintenance of closed space |
| CN102220878A (en) * | 2010-04-14 | 2011-10-19 | 厦门一体网智能科技开发有限公司 | Fixed shelter with double-protection structure |
| CN102296983A (en) * | 2011-05-10 | 2011-12-28 | 中安金力（北京）安全生产技术研究院 | Monitoring control system for mobile rescue capsule or fixed refuge chamber |
| CN102373944A (en) * | 2010-08-18 | 2012-03-14 | 林中选 | Oxygen supply device in rescue capsule |
| CN102767390A (en) * | 2011-04-30 | 2012-11-07 | 黑龙江省华升救援装备有限公司 | Automatic master core-control system of mine-used escape capsule |
| WO2012174690A1 (en) * | 2011-06-23 | 2012-12-27 | Han Xuefeng | Mobile steel refuge chamber |
| CN102900461A (en) * | 2012-09-12 | 2013-01-30 | 淮北市瑞鼎液压支柱有限责任公司 | Cable transition interface for mine-used lifesaving cabins |
| CN103161495A (en) * | 2012-07-27 | 2013-06-19 | 上海宝亚安全装备有限公司 | Downhole rescue system |
| CN103157202A (en) * | 2012-07-27 | 2013-06-19 | 上海宝亚安全装备有限公司 | Removable life-saving system for mining |
| CN103244174A (en) * | 2013-05-16 | 2013-08-14 | 北京科技大学 | Orifice butting device for supporting underground urgent danger prevention system |
| CN103362544A (en) * | 2013-07-15 | 2013-10-23 | 北京科技大学 | Oxygen candle oxygen supply system in emergency disaster prevention space |
| CN103452581A (en) * | 2012-05-28 | 2013-12-18 | 长春金鹰智谷科技集团有限公司 | Method for solving survival guarantees of underground persons in distress by utilizing special pipelines |
| CN103775123A (en) * | 2014-01-16 | 2014-05-07 | 邸永春 | Mine soft capsule anti-seepage method and structure |
| CN104358586A (en) * | 2014-12-01 | 2015-02-18 | 中煤科工集团重庆研究院有限公司 | Mining escape and rescue supply depot |
| CN105525944A (en) * | 2016-01-19 | 2016-04-27 | 沈阳建筑大学 | Mine escape system |
| CN117823220A (en) * | 2024-03-04 | 2024-04-05 | 泰兴市华诚机电制造有限公司 | Tunnel construction safety guarantee cabin |
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2008
- 2008-08-01 CN CNA2008101368689A patent/CN101368484A/en active Pending
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220878A (en) * | 2010-04-14 | 2011-10-19 | 厦门一体网智能科技开发有限公司 | Fixed shelter with double-protection structure |
| CN101852087A (en) * | 2010-06-25 | 2010-10-06 | 盛健 | Safety guarantee channel for boring operation staff |
| CN102373944A (en) * | 2010-08-18 | 2012-03-14 | 林中选 | Oxygen supply device in rescue capsule |
| CN102011608A (en) * | 2010-12-15 | 2011-04-13 | 东南大学 | Air cooling, dehumidifying and purifying system and method |
| CN102011608B (en) * | 2010-12-15 | 2012-07-25 | 东南大学 | Air cooling, dehumidifying and purifying system and method |
| CN102108876A (en) * | 2011-01-18 | 2011-06-29 | 辽宁卓异科技有限公司 | Temperature-reducing and dehumidifying device for mine refuge underground chambers |
| CN102071965A (en) * | 2011-02-18 | 2011-05-25 | 三一重型装备有限公司 | Mine disaster life-saving system and method |
| CN102080566A (en) * | 2011-02-18 | 2011-06-01 | 三一重型装备有限公司 | Refuge cave chamber structure |
| CN102080566B (en) * | 2011-02-18 | 2012-10-03 | 三一重型装备有限公司 | Refuge cave chamber structure |
| CN102182503A (en) * | 2011-04-08 | 2011-09-14 | 南京航空航天大学 | Automatic control equipment and automatic control method for micro-positive pressure maintenance of closed space |
| CN102767390A (en) * | 2011-04-30 | 2012-11-07 | 黑龙江省华升救援装备有限公司 | Automatic master core-control system of mine-used escape capsule |
| CN102296983A (en) * | 2011-05-10 | 2011-12-28 | 中安金力（北京）安全生产技术研究院 | Monitoring control system for mobile rescue capsule or fixed refuge chamber |
| WO2012174690A1 (en) * | 2011-06-23 | 2012-12-27 | Han Xuefeng | Mobile steel refuge chamber |
| CN103452581A (en) * | 2012-05-28 | 2013-12-18 | 长春金鹰智谷科技集团有限公司 | Method for solving survival guarantees of underground persons in distress by utilizing special pipelines |
| CN103157202B (en) * | 2012-07-27 | 2015-03-25 | 上海宝亚安全装备有限公司 | Removable life-saving system for mining |
| CN103161495A (en) * | 2012-07-27 | 2013-06-19 | 上海宝亚安全装备有限公司 | Downhole rescue system |
| CN103157202A (en) * | 2012-07-27 | 2013-06-19 | 上海宝亚安全装备有限公司 | Removable life-saving system for mining |
| CN102900461A (en) * | 2012-09-12 | 2013-01-30 | 淮北市瑞鼎液压支柱有限责任公司 | Cable transition interface for mine-used lifesaving cabins |
| CN103244174A (en) * | 2013-05-16 | 2013-08-14 | 北京科技大学 | Orifice butting device for supporting underground urgent danger prevention system |
| CN103244174B (en) * | 2013-05-16 | 2016-01-20 | 北京科技大学 | A kind of aperture docking facilities supported for underground urgent danger prevention system |
| CN103362544B (en) * | 2013-07-15 | 2015-11-04 | 北京科技大学 | The oxygen candle oxygen system of emergency refuge space |
| CN103362544A (en) * | 2013-07-15 | 2013-10-23 | 北京科技大学 | Oxygen candle oxygen supply system in emergency disaster prevention space |
| CN103775123A (en) * | 2014-01-16 | 2014-05-07 | 邸永春 | Mine soft capsule anti-seepage method and structure |
| CN104358586A (en) * | 2014-12-01 | 2015-02-18 | 中煤科工集团重庆研究院有限公司 | Mining escape and rescue supply depot |
| CN105525944A (en) * | 2016-01-19 | 2016-04-27 | 沈阳建筑大学 | Mine escape system |
| CN117823220A (en) * | 2024-03-04 | 2024-04-05 | 泰兴市华诚机电制造有限公司 | Tunnel construction safety guarantee cabin |
| CN117823220B (en) * | 2024-03-04 | 2024-05-24 | 泰兴市华诚机电制造有限公司 | Tunnel construction safety guarantee cabin |
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Open date: 20090218 |