CN108457701B - Colliery waterproof safety precaution device - Google Patents
Colliery waterproof safety precaution device Download PDFInfo
- Publication number
- CN108457701B CN108457701B CN201810233618.0A CN201810233618A CN108457701B CN 108457701 B CN108457701 B CN 108457701B CN 201810233618 A CN201810233618 A CN 201810233618A CN 108457701 B CN108457701 B CN 108457701B
- Authority
- CN
- China
- Prior art keywords
- early warning
- warning device
- device shell
- fixed mounting
- display screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000003245 coal Substances 0.000 claims abstract description 22
- 230000006698 induction Effects 0.000 claims abstract description 17
- 239000011521 glass Substances 0.000 claims abstract description 10
- 239000000523 sample Substances 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 9
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000035515 penetration Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004868 gas analysis Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention discloses a coal mine waterproof safety early warning device, which comprises an early warning device shell, wherein fixed clamping plates are arranged at two ends of the early warning device shell, grooves are fixedly arranged on the outer surfaces of the two ends of the early warning device shell, a control panel is arranged on the outer surface of the front end of the early warning device shell, a display screen is fixedly arranged on the outer surface of the control panel, an alarm loudspeaker tube is fixedly arranged on one side above the outer surface of the display screen, a water drop induction shell is arranged at the upper end of the early warning device shell, a glass panel is fixedly arranged on the upper surface of the water drop induction shell, an induction cavity is arranged in the water drop induction shell, a light emitting diode is arranged in the induction cavity, and an integrated circuit board is arranged in the early warning device shell. The invention has simple structure, can conveniently fix the early warning device, can carry out multidirectional detection on the periphery of the mining working face, and can timely send out early warning before the water penetration accident occurs.
Description
Technical Field
The invention relates to the technical field of safety precaution, in particular to a coal mine waterproof safety precaution device.
Background
Coal is the main energy industry in China, most coal beds in China are below the ground surface, the safety system of coal mining is developed in the coal industry, coal mine water permeation is one of common disaster accidents, when coal mines are mined in tunnels, water permeation accidents can be caused by digging through the tunnel walls to be connected with underground water or ponding abandoned tunnels, loss and severity are caused, therefore, in the work of the coal mines, the use of the water permeation safety early warning device is common, certain defects exist in the use of the existing safety early warning device, certain symptoms exist before the water permeation accidents occur, the content of harmful gases is increased, small water beads are integrated in the mining working surface, and the early warning device cannot detect the gas and the water content in the environment in real time, so that the early warning effect is reduced.
Disclosure of Invention
The invention aims to solve some problems in the prior art, and provides a coal mine waterproof safety early warning device.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a colliery waterproof safety precaution device, includes the precaution device shell, the both ends of precaution device shell all are provided with fixed cardboard, the equal fixed mounting in both ends surface of precaution device shell has the recess, the front end surface of precaution device shell is provided with control panel, and control panel's surface fixed mounting has the display screen, surface top one side fixed mounting of display screen has the alarm to raise the sound section of thick bamboo, the upper end of precaution device shell is provided with water droplet induction housing, and water droplet induction housing's upper surface fixed mounting has the glass panel, the inside of water droplet induction housing is provided with the response inner chamber, and the inside of response inner chamber is provided with emitting diode, the inside of precaution device shell is provided with the integrated circuit board, and the internal surface fixed mounting of precaution device shell has the sealing washer, one end top of precaution device shell is provided with infrared gas absorption probe, one end fixed mounting that surface one side of integrated circuit board is close to infrared gas absorption probe has the gas analysis board, the other end below of precaution device shell is provided with monitoring probe, the opposite side of integrated circuit board is close to volume monitoring probe's fixed mounting volume.
Preferably, the outer surface parallel fixed mounting of fixed cardboard has the mounting hole, and one side that is close to the early warning device shell in the inside one side of fixed cardboard is provided with the rotation round pin, the activity angle scope of fixed cardboard is zero degrees to one hundred eighty degrees.
Preferably, the illuminating lamps are fixedly arranged above the outer surface of the early warning device shell, the number of the illuminating lamps is three, and the illuminating lamps are arranged on the early warning device shell in parallel.
Preferably, a power switch is arranged on one side below the outer surface of the control panel, and a dust cover is movably arranged on the outer surface of the alarm loudspeaker cylinder.
Preferably, one side of the outer surface of the display screen is provided with a parameter display screen, and the other side of the outer surface of the display screen is provided with a touch screen.
Preferably, rubber bordures are fixedly installed at two ends of the outer surface of the display screen, and an anti-slip pad is arranged on the outer surface of the groove.
Preferably, a wire is fixedly arranged at the lower end of the light emitting diode, and a storage battery is fixedly arranged below the outer surface of the integrated circuit board.
Compared with the prior art, the invention provides the coal mine waterproof safety early warning device, which has the following beneficial effects:
1. this colliery safety precaution device that permeates water through setting up fixed cardboard, recess and sealing washer, can conveniently be fixed to early warning device, and the recess has made things convenient for taking the device and has put, simultaneously, and the sealing washer has improved the leakproofness of device inner wall, avoids inside to wet or infiltration to cause working circuit short circuit.
2. According to the coal mine waterproof safety early warning device, the light-emitting diode and the glass panel are arranged, so that water around the environment can be measured, when water drops drop to the glass panel or water mist exists on the glass panel, a part of light rays emitted by the light-emitting diode deviate, so that the total quantity of light received by the sensor changes, the existence of the water drops is detected, and the water in a water accumulation area is proved to form a plurality of water drops on a mining working surface through coal rock cracks under the action of self pressure, so that the mining cannot be continued.
3. According to the coal mine waterproof safety early warning device, through the arrangement of the infrared gas absorption probe and the volume monitoring probe, gas in a roadway can be absorbed and analyzed, when harmful gas increase of a mining working face is detected, the coal mine waterproof safety early warning device is very close to a water accumulation area and cannot continue to excavate, and meanwhile, when the volume monitoring probe detects howling or exceeds a set threshold value, the high-pressure water in a water-bearing layer or the water accumulation area is indicated to be extruded towards a coal rock crack and cannot continue to excavate.
The device has the advantages that the structure is simple, the fixation of the early warning device can be facilitated, the multi-azimuth detection can be carried out on the periphery of the mining working face, and the early warning can be timely sent out before the water penetration accident occurs.
Drawings
FIG. 1 is a schematic diagram of a coal mine waterproof safety precaution device;
fig. 2 is a partial view of a coal mine waterproof safety precaution device provided by the invention.
In the figure: 1 an early warning device shell, 2 a fixed clamping plate, 3 a mounting hole, 4 a groove, 5 an illuminating lamp, 6 a control panel, 7 a display screen, 8 a parameter display screen, 9 a touch screen, 10 a rubber edge, 11 a power switch, 12 an alarm loudspeaker cylinder, 13 a water drop induction shell, 14 a glass panel, 15 an induction inner cavity, 16 a light emitting diode, 17 a wire, 18 an integrated circuit board, 19 a sealing ring, 20 an infrared gas absorption probe, 21 a gas analysis plate, 22 a storage battery, 23 a volume monitoring probe, 24 and a volume analysis plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1-2, a colliery waterproof safety precaution device, including precaution device shell 1, the both ends of precaution device shell 1 all are provided with fixed cardboard 2, the both ends surface of precaution device shell 1 all fixed mounting has recess 4, the front end surface of precaution device shell 1 is provided with control panel 6, and the surface fixed mounting of control panel 6 has display screen 7, one side fixed mounting has the warning loudspeaker tube 12 above the surface of display screen 7, the upper end of precaution device shell 1 is provided with water droplet induction housing 13, and the upper surface fixed mounting of water droplet induction housing 13 has glass panel 14, the inside of water droplet induction housing 13 is provided with sensing inner chamber 15, and the inside of sensing inner chamber 15 is provided with emitting diode 16, the inside of precaution device shell 1 is provided with integrated circuit board 18, and the internal surface fixed mounting of precaution device shell 1 has sealing washer 19, one end top of precaution device shell 1 is provided with infrared gas absorption probe 20, one end fixed mounting of one side of surface side near infrared gas absorption probe 20 has gas analysis board 21, the other side 1's another end below of precaution device shell 1 is provided with volume board 23, the volume monitoring circuit of the integrated circuit of being close to volume monitoring probe 23 is fixed mounting of volume monitoring end of the volume monitoring probe 23.
The surface parallel fixed mounting of fixed cardboard 2 has mounting hole 3, and the inside one side of fixed cardboard 2 is provided with the rotation round pin near one side of early warning device shell 1, the movable angle scope of fixed cardboard 2 is zero degrees to one hundred eighty degrees, the surface top fixed mounting of early warning device shell 1 has light 5, and the quantity of light 5 is three sets of, light 5 parallel arrangement on early warning device shell 1, surface below one side of control panel 6 is provided with switch 11, the surface movable mounting of warning speaker 12 has the dust cover, surface one side of display screen 7 is provided with parameter display screen 8, and the surface opposite side of display screen 7 is provided with touch-sensitive screen 9, the surface both ends of display screen 7 are all fixed mounting and are covered with rubber limit 10, the surface of recess 4 is provided with the slipmat, the lower extreme fixed mounting of emitting diode 16 has wire 17, the surface below fixed mounting of integrated circuit board 18 has battery 22.
In the invention, the fixed clamping plate 2 on the housing 1 of the early warning device is convenient for fixing the early warning device, the mounting hole 3 fixes the fixing bolt, the groove 4 is convenient for taking and putting the device, meanwhile, the sealing ring 19 improves the tightness of the inner wall of the device, the working circuit short circuit caused by internal damp or water seepage is avoided, the illuminating lamp 5 provides illumination, the rubber covered edge 10 protects the display screen 7, the power switch 11 is pressed, the device starts to operate, the touch screen 9 on the control panel 6 is used for setting the warning threshold value of each parameter, the parameter display screen 8 on the display screen 7 displays the real-time parameters of each detection object in the surrounding environment, when water drops drop to the glass panel 14 on the water drop sensing housing 13 or water mist exists on the glass panel 14, the sensing cavity 15 is internally provided with a sensing cavity, a lead 17 is connected with a light emitting diode 16 to emit a part of light, the light quantity of the sensing cavity is deviated, the sensor receives the change of the total quantity of the light, so that the existence of water drops is detected, an integrated circuit board 18 controls the normal operation of a detection working circuit, a storage battery 22 supplies power for the operation of the device, an infrared gas absorption probe 20 absorbs and analyzes gas in a roadway, when the harmful gas of a mining working surface is increased through the treatment of a gas analysis board 21, the mining is indicated to be very close to a water accumulation area and can not continue to be carried out, a volume monitoring probe 23 detects whistle and indicates that high-pressure water in a water-bearing layer or the water accumulation area is positively extruded by a coal-rock crack through the treatment of a volume analysis board 24 and can not continue to be carried out, and at the moment, an alarm is emitted by an alarm sounding cylinder 12, so that is practical.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The utility model provides a colliery waterproof safety precaution device, includes early warning device shell (1), its characterized in that: both ends of early warning device shell (1) all are provided with fixed cardboard (2), the both ends surface of early warning device shell (1) all fixed mounting has recess (4), the front end surface of early warning device shell (1) is provided with control panel (6), and the surface fixed mounting of control panel (6) has display screen (7), surface top one side fixed mounting of display screen (7) has alarm loudspeaker tube (12), the upper end of early warning device shell (1) is provided with water droplet induction housing (13), and the upper surface fixed mounting of water droplet induction housing (13) has glass panel (14), the inside of water droplet induction housing (13) is provided with response inner chamber (15), and the inside of response inner chamber (15) is provided with emitting diode (16), the inside of early warning device shell (1) is provided with integrated circuit board (18), and the interior surface fixed mounting of early warning device shell (1) has sealing washer (19), the one end top of early warning device shell (1) is provided with infrared ray gas absorption probe (20), the surface of integrated circuit board (18) is provided with water droplet induction housing (20), the volume of gas absorption device (21) near the fixed mounting of the other end of the infrared probe (1), a volume analysis plate (24) is fixedly arranged at one end, close to the volume monitoring probe (23), of the other side of the outer surface of the integrated circuit board (18); the outer surface of the fixed clamping plate (2) is fixedly provided with a mounting hole (3) in parallel, one side, close to the early warning device shell (1), of the inner side of the fixed clamping plate (2) is provided with a rotating pin, and the movable angle range of the fixed clamping plate (2) is zero degrees to one hundred eighty degrees; the external surface top fixed mounting of early warning device shell (1) has light (5), and the quantity of light (5) is three group, light (5) parallel arrangement on early warning device shell (1).
2. The coal mine waterproof safety precaution device according to claim 1, characterized in that: a power switch (11) is arranged on one side below the outer surface of the control panel (6), and a dust cover is movably arranged on the outer surface of the alarm sounding barrel (12).
3. The coal mine waterproof safety precaution device according to claim 1, characterized in that: parameter display screens (8) are arranged on one side of the outer surface of the display screen (7), and touch screens (9) are arranged on the other side of the outer surface of the display screen (7).
4. The coal mine waterproof safety precaution device according to claim 1, characterized in that: rubber bordures (10) are fixedly installed at two ends of the outer surface of the display screen (7), and anti-slip pads are arranged on the outer surface of the groove (4).
5. The coal mine waterproof safety precaution device according to claim 1, characterized in that: the lower end of the light emitting diode (16) is fixedly provided with a lead (17), and a storage battery (22) is fixedly arranged below the outer surface of the integrated circuit board (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810233618.0A CN108457701B (en) | 2018-03-21 | 2018-03-21 | Colliery waterproof safety precaution device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810233618.0A CN108457701B (en) | 2018-03-21 | 2018-03-21 | Colliery waterproof safety precaution device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108457701A CN108457701A (en) | 2018-08-28 |
| CN108457701B true CN108457701B (en) | 2023-10-27 |
Family
ID=63237649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810233618.0A Active CN108457701B (en) | 2018-03-21 | 2018-03-21 | Colliery waterproof safety precaution device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108457701B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606219A (en) * | 1983-07-05 | 1986-08-19 | Crucible S.A. | Gas detectors |
| CN103291361A (en) * | 2013-05-10 | 2013-09-11 | 安徽恒源煤电股份有限公司 | Coal mine underground water control alarm |
| CN203257468U (en) * | 2012-12-30 | 2013-10-30 | 程孝龙 | Underground coal mine water permeation monitoring and early warning device |
| CN105223113A (en) * | 2015-09-28 | 2016-01-06 | 国家电网公司 | A kind of electrical control dish cabinet dust detection |
| CN105351007A (en) * | 2015-11-26 | 2016-02-24 | 华北科技学院 | Coal mine water quality quick detection and water damage pre-warning system |
| CN205189957U (en) * | 2015-11-17 | 2016-04-27 | 重庆城市管理职业学院 | Coal mine underground permeable early warning device |
| CN206175003U (en) * | 2016-11-18 | 2017-05-17 | 郭力 | A security protection device for coal mining |
| CN208089350U (en) * | 2018-03-21 | 2018-11-13 | 安徽理工大学 | A kind of coal mine permeation-proof water security information early warning device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279245B (en) * | 2011-06-22 | 2014-12-24 | 哈尔滨东方报警设备开发有限公司 | Integrated acousto-optic warning gas detector |
-
2018
- 2018-03-21 CN CN201810233618.0A patent/CN108457701B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4606219A (en) * | 1983-07-05 | 1986-08-19 | Crucible S.A. | Gas detectors |
| CN203257468U (en) * | 2012-12-30 | 2013-10-30 | 程孝龙 | Underground coal mine water permeation monitoring and early warning device |
| CN103291361A (en) * | 2013-05-10 | 2013-09-11 | 安徽恒源煤电股份有限公司 | Coal mine underground water control alarm |
| CN105223113A (en) * | 2015-09-28 | 2016-01-06 | 国家电网公司 | A kind of electrical control dish cabinet dust detection |
| CN205189957U (en) * | 2015-11-17 | 2016-04-27 | 重庆城市管理职业学院 | Coal mine underground permeable early warning device |
| CN105351007A (en) * | 2015-11-26 | 2016-02-24 | 华北科技学院 | Coal mine water quality quick detection and water damage pre-warning system |
| CN206175003U (en) * | 2016-11-18 | 2017-05-17 | 郭力 | A security protection device for coal mining |
| CN208089350U (en) * | 2018-03-21 | 2018-11-13 | 安徽理工大学 | A kind of coal mine permeation-proof water security information early warning device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108457701A (en) | 2018-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104265272B (en) | High-precision coal slime water level measuring device | |
| CN108457701B (en) | Colliery waterproof safety precaution device | |
| CN106870008A (en) | A kind of safety early warning device for detecting coal mine gas | |
| CN207007696U (en) | Mining infrared methane sensor | |
| CN206057299U (en) | A kind of coal mine gas concentration detection and safety early warning device | |
| CN203908674U (en) | Ultraviolet ray flame sensor housing | |
| CN103207147B (en) | Mine intrinsic safety smoke transducer | |
| CN203587585U (en) | Novel methane sensor | |
| CN208089350U (en) | A kind of coal mine permeation-proof water security information early warning device | |
| CN205898671U (en) | Infrared carbon dioxide sensor | |
| CN205103145U (en) | All -round detection device of indoor gas | |
| CN205012992U (en) | Device of simple and convenient sealed effect of detection gas drainage under suction drilling | |
| CN104291041A (en) | Floating deck state indicator of external floating roof tank | |
| CN209446544U (en) | A kind of coal mine down-hole gas safety monitoring device | |
| CN106290743A (en) | A kind of coal mine gas concentration detection and safety early warning device | |
| CN103625608B (en) | Sea area carbon remittance amount wireless monitor buoy | |
| CN206917681U (en) | A kind of safety of coal mines gas monitor device | |
| CN207036826U (en) | A kind of Portable combustible gas detector | |
| CN210572129U (en) | Ultrasonic wave building crack detection device | |
| CN2928140Y (en) | Safety escape device for tunnel | |
| CN205562504U (en) | Mining gaseous detection device | |
| CN206487498U (en) | A kind of mining permeable early warning anchor pole | |
| CN110047242B (en) | Smoke sensor for mine | |
| CN207611026U (en) | A kind of mining methane sensor | |
| CN103017062A (en) | Gas alarming miner light with positioning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |