CN108999639A - A kind of transport alarm system of underground self-navigation - Google Patents
A kind of transport alarm system of underground self-navigation Download PDFInfo
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- CN108999639A CN108999639A CN201810940837.2A CN201810940837A CN108999639A CN 108999639 A CN108999639 A CN 108999639A CN 201810940837 A CN201810940837 A CN 201810940837A CN 108999639 A CN108999639 A CN 108999639A
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- 238000012544 monitoring process Methods 0.000 claims abstract description 44
- 239000007789 gas Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000004040 coloring Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 22
- 230000002159 abnormal effect Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- VMXUWOKSQNHOCA-UKTHLTGXSA-N ranitidine Chemical compound [O-][N+](=O)\C=C(/NC)NCCSCC1=CC=C(CN(C)C)O1 VMXUWOKSQNHOCA-UKTHLTGXSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000011017 operating method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000010291 electrical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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
- E21F13/00—Transport specially adapted to underground conditions
- E21F13/006—Equipment transport systems
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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)
- Mechanical Engineering (AREA)
- Alarm Systems (AREA)
- Fire Alarms (AREA)
Abstract
The present invention provides a kind of transport alarm system of underground self-navigation.The transport alarm system of this underground self-navigation of the present invention carries out real-time monitoring to underground coal mine integrated environment situation, pyrophoric gas concentration levels, equipment safety situation and personnel's production operation situation, when monitoring abnormal conditions, it is sounded an alarm using alarm module, independent linking fire device data is uploaded to monitoring center module in the way of wireless transmission by the present invention, and monitoring center module analyzes optimal abnormal conditions solution according to the data of acquisition.This system performance is stablized, and monitoring effect is good, can effectively prevent and avoid the generation of coal-mine fire, is attached by the way of wireless transmission and data are transmitted, have many advantages, such as that delay is short, at low cost, safe and reliable.
Description
Technical field
The invention belongs to mining technique fields, and in particular to a kind of transport alarm system of underground self-navigation.
Background technique
Coal resources in China reserves the first in the world, however coal fire dieseling is extremely serious, not only causes coal resources
Huge waste also constitutes very big pollution to environment.Domestic and foreign scholars carry out coal-field fire identification using remote sensing technology and lead with monitoring
Multispectral and middle low resolution remote sensing image is relied on, it can only qualitative or semi-quantitatively offer fire location and flame range approximate range
Etc. information, it is difficult to meet coal-field fire monitoring accuracy and the increasing demand of accuracy.Conventional remote sensing coal fire detection method is
Density slice is carried out using threshold value appropriate to according to the temperature of Thermal Infrared Data inverting, achievees the purpose that Coarse Acquisition coal fire,
The coal-field fire range that this method detects frequently includes non-coal fire temperature anomaly interference atural object, such as water body, heat plant room etc., hardly possible
Accurately to extract the range of coal-field fire.The accurately and effectively extraction coal mine fire area range that how to adopt remote sensing techniques is that coal-field fire is controlled
In reason the problem of urgent need to resolve.
The appearance of EO-1 hyperion thermal infrared remote sensing provides solution for the above problem.EO-1 hyperion thermal infrared remote sensing has sky
Between, radiation and spectrum three-dimensional information, data volume is big, abundant information.The atural object radiation feature information for including is finer.It is how sharp
Atural object heat anomaly is subtly distinguished with its atural object radiation information abundant, quantitative detection coalfield coal fire is refined, studies at home
It is still few.
Coal fire detection in underground is that flame range spatial dimension is quantitatively described, and generallys use magnetic method, electrical method at present over the ground
Lower coal fire abnormal combustion is detected, and determines flame range depth in conjunction with probing and ocurrence of coal seam, can solve coal fire detection to a certain degree
Problem, but quantitative accuracy is limited.
Underground coalfield fire monitoring is to be monitored to flame range combustion state, is mainly led at present by burying shallow-layer peephole
Cross gas sample monitoring analysis O in acquisition hole2, CO concentration judge the possible combustion state of flame range.
Summary of the invention
The object of the present invention is to provide a kind of coal mine down-hole fire monitorings based on Internet of Things, solve existing automatic prison
Control system control inaccuracy, stability are poor, or even the transport alarm system of underground self-navigation the problem of paralysis.
Above-mentioned technical purpose of the invention has the technical scheme that
A kind of transport alarm system of underground self-navigation, including conveyer and monitoring center, the conveyer include control mould
Block, memory module, warning device and the integrated environment acquisition module being connect with the control module, it is characterised in that: described
Control module signal connects the integrated environment acquisition module and the memory module, and the integrated environment acquisition module signal connects
Connecing the warning device, the conveyer further includes the wireless module being connected with control module, color detection module and road sign,
The conveyer is connect by the wireless module with the monitoring center signal, and the road sign includes being layed in along travelling route
Different location ground, with ground color distinguish apparent pure color colour band；The color detection module is for detecting the conveying
Color immediately below machine, and the colouring information that will test is sent to advance of the control module to correct the conveyer
Direction.
The transport alarm system of above-mentioned underground self-navigation, integrated environment acquisition module include gas concentration monitoring mould
Block, equipment safety monitoring modular, double band fire detecting device and video monitoring module；It is the gas concentration monitoring modular, described
Equipment safety monitoring modular, the double band fire detecting device and video monitoring module are bi-directionally connected with the monitoring center.
The transport alarm system of above-mentioned underground self-navigation, the color detection module are set to the conveying motor spindle,
It is equidistantly arranged side by side including the direction of advance perpendicular to the conveyer at least four sensings of the conveying motor spindle surrounding
Device, the distance between the first sensor and the 4th sensor are slightly less than the width of the colour band, first sensing
This rgb value is sent to the control module, institute to the 4th sensor rgb value of ground color below for identification by device
The rgb value for stating four collected ground of sensor is followed successively by first to fourth rgb value from left to right, the control module according to
The rgb value received corrects the direction of advance of the conveyer.
The transport alarm system of above-mentioned underground self-navigation, the colour band pass through each machine plotting side, and colour band starting point,
Colour band surface by colour band terminal and each machine plotting is respectively arranged with a color lump, and the colour band and each color lump are pure color, and
Its color is all different；The rgb value of the color of the colour band and each color lump is pre-saved to the control module.
The transport alarm system of above-mentioned underground self-navigation, the colour band are closed loop, the colour band starting point and color
Band terminal is identified using same color lump.
The transport alarm system of above-mentioned underground self-navigation, the memory module include NAND FLASH memory and
SDRAM memory, integrated environment capture program and map datum are stored in NAND FLASH memory.
The transport alarm system of above-mentioned underground self-navigation, the conveyer include:
The ultrasonic sensor, for measure conveyer with barrier or between the walls at a distance from, realize barrier avoiding function, together
When auxiliary positioning data is also provided；
The infrared sensor, for preventing from falling in the conveyer course of work from eminence.
The transport alarm system of above-mentioned underground self-navigation, the gas concentration monitoring modular include methane transducer,
Carbon monoxide transducer, oxygen sensor and sensor of dust concentration.
The transport alarm system of above-mentioned underground self-navigation, the equipment safety monitoring modular include smoke sensor device,
Temperature sensor and flame detector.
In conclusion the invention has the following advantages: the transport alarm system of this underground self-navigation is to coal mine
Underground integrated environment situation, pyrophoric gas concentration levels, equipment safety situation and personnel's production operation situation carry out real-time monitoring,
It when monitoring abnormal conditions, is sounded an alarm using alarm module, the present invention is in the way of wireless transmission by independent fire
Interlocking equipment data are uploaded to monitoring center module, and monitoring center module analyzes optimal abnormal conditions solution according to the data of acquisition
Certainly method.This system performance is stablized, and monitoring effect is good, can effectively prevent and avoid the generation of coal-mine fire, use nothing
The mode of line transmission is attached and data transmission, has many advantages, such as that delay is short, at low cost, safe and reliable.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the transport alarm system of underground self-navigation of the present invention.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Refering to fig. 1, the present invention provides a kind of transport alarm system of underground self-navigation, including conveyer 1 and prison
Control center, the conveyer 1 include control module 2, memory module 3, warning device 4 and connect with the control module 2
Integrated environment acquisition module 5, it is characterised in that: 2 signal of control module connects the integrated environment acquisition module 5 and described
Memory module 3,5 signal of integrated environment acquisition module connect the warning device 4, and the conveyer 1 further includes and controls
Wireless module 6, color detection module 7 and the road sign that module 2 is connected, the conveyer 1 by the wireless module 6 with it is described
Monitoring center signal connection, the road sign include be layed in along travelling route different location ground, with ground color difference it is bright
Aobvious pure color colour band；The color detection module 7 is used to detect the color immediately below the conveyer 1, and the face that will test
Color information is sent to direction of advance of the control module 2 to correct the conveyer 1.
Further, comprehensive in a kind of preferred embodiment of the transport alarm system mouth of underground self-navigation of the present invention
Environment acquisition module 5 includes gas concentration monitoring modular 51, equipment safety monitoring modular 52, double band fire detecting device 53 and view
Frequency monitoring module 54；The gas concentration monitoring modular 51, the equipment safety monitoring modular 52, the double band fire detecting
Device 53 and video monitoring module 54 are bi-directionally connected with the monitoring center.
Further, described in a kind of preferred embodiment of the transport alarm system mouth of underground self-navigation of the present invention
Color detection module 6 is set to 1 bottom of conveyer, including being equidistantly arranged side by side perpendicular to the direction of advance of the conveyer 1
In at least four sensors of the 1 bottom surrounding of conveyer, between the first sensor and the 4th sensor away from
From the width for being slightly less than the colour band, the first sensor to the 4th sensor RGB of ground color below for identification
Value, and this rgb value is sent to the control module, the rgb value on the collected ground of four sensors from left to right according to
Secondary is first to fourth rgb value, and the control module corrects the direction of advance of the conveyer according to the rgb value received.
Further, described in a kind of preferred embodiment of the transport alarm system mouth of underground self-navigation of the present invention
Colour band passes through each machine plotting side, and the colour band surface by colour band starting point, colour band terminal and each machine plotting is respectively arranged with a color lump,
The colour band and each color lump are pure color, and its color is all different；The RGB of the color of the colour band and each color lump
Value is pre-saved to the control module 2.Conveyer 1 is placed at starting point color lump when initial, and by the forward direction tune of conveyer 1
Whole identical to the direction being displaced with needs, conveyer 1 successively reaches the first machine plotting color lump, the second machine plotting color along colour band by tracking
Block and terminal color lump, when reaching machine plotting color lump, conveyer 1 can be by each tunnel in integrated environment acquisition module collection of coal mine underground
Gas, temperature and humidity condition, reach home color lump when, conveyer 1 stop integrated environment acquisition module acquisition.
Further, described in a kind of preferred embodiment of the transport alarm system mouth of underground self-navigation of the present invention
Colour band is closed loop, and the colour band starting point and colour band terminal are identified using same color lump.
Further, described in a kind of preferred embodiment of the transport alarm system mouth of underground self-navigation of the present invention
Memory module 3 includes NAND FLASH memory and SDRAM memory, and integrated environment capture program 5 and map datum are stored in
In NAND FLASH memory.
Further, described in a kind of preferred embodiment of the transport alarm system mouth of underground self-navigation of the present invention
Conveyer 1 includes:
The ultrasonic sensor 11, for measure conveyer 1 with barrier or between the walls at a distance from, realize avoidance function
Can, while auxiliary positioning data being also provided；
The infrared sensor 12, for preventing from falling in 1 course of work of conveyer from eminence.
Further, described in a kind of preferred embodiment of the transport alarm system mouth of underground self-navigation of the present invention
Gas concentration monitoring modular 51 includes methane transducer, carbon monoxide transducer, oxygen sensor and sensor of dust concentration.
Further, described in a kind of preferred embodiment of the transport alarm system mouth of underground self-navigation of the present invention
Equipment safety monitoring modular 52 includes smoke sensor device, temperature sensor and flame detector.
Working principle of the invention is as follows: utilizing gas, temperature in each tunnel in integrated environment acquisition module collection of coal mine underground
And humidity condition；Utilize methane, carbon monoxide, oxygen and powder in each tunnel of gas concentration monitoring modular real-time monitoring underground coal mine
The concentration of dirt, when any concentration is exceeded in methane, carbon monoxide, oxygen and dust, then alarm module sounds an alarm；Using setting
Standby each equipment of safety monitoring module real-time monitoring underground coal mine whether there is that temperature is excessively high, causes smog and bright in use
Fiery problem；When device temperature is excessively high, or causes smog and open fire, then alarm module sounds an alarm；It is visited using two waveband fire
It surveys device generally to monitor underground coal mine space environment, when detecting fire signal, then alarm module sounds an alarm；It utilizes
Video monitoring module monitors the comprehensive condition of underground coal mine in real time, and whether the especially operation of producers in process of production advises
Model, when producers' operation exception, then alarm module sounds an alarm；When alarm module responding is given the correct time, monitoring personnel is according to prison
The data information that center module obtains is controlled, best solution is analyzed.
The operating method of this guide system based on intelligent navigation, comprising:
Step S1 is pre-saved if any one of first to fourth rgb value is in the color of each color lump of control module
It in the range of any one of rgb value, then halts, and acquires the integrated environment of surrounding, continue tracking after acquisition
Advance；
Step S2, if only the first rgb value is not at the range of the colored rgb value of color, turn right first angle, then after
Continuous tracking；
Step S3 turns right if only the first rgb value and the second rgb value are not at the range of the colored rgb value of the color
Dynamic second angle, then proceedes to tracking；
Step S4, if only the 4th rgb value is not at the range of the colored rgb value of the color, turn left first angle, so
After continue tracking；
Step S5 turns left if only third rgb value and the 4th rgb value are not at the range of the colored rgb value of the color
Dynamic second angle, then proceedes to tracking；
Step S6 keeps straight on if first to fourth rgb value is in the range of the colored rgb value of the color.
A white light source is arranged in the operating method of this guide system based on intelligent navigation before sensor, enables and passes
Red filter in sensor, measure the first umber of pulse that sensor issues in 10ms, and by 256 with first umber of pulse
Ratio is as red adjusting parameter；The green filter in sensor is enabled, the second pulse that sensor issues in 10ms is measured
Number, and using 256 with the ratio of second umber of pulse as green adjusting parameter；The blue electric-wave filter in sensor is enabled, is surveyed
Measure the third umber of pulse that sensor issues in 10ms, and using 256 with the ratio of the third umber of pulse as blue adjusting parameter.
The operating method of this guide system based on intelligent navigation, the step S1 include:
Step S11 enables the red filter in sensor, measures the output umber of pulse of sensor in 10ms, and by the pulse
For number multiplied by the red adjusting parameter, obtained numerical value is the A value of ground color below current sensor；
Step S12 enables the green filter in sensor, measures the output umber of pulse of sensor in 10ms, and by the pulse
For number multiplied by the green adjusting parameter, obtained numerical value is the B value of ground color below current sensor；
Step S13 enables the blue electric-wave filter in sensor, measures the output umber of pulse of sensor in 10ms, and by the pulse
For number multiplied by the blue adjusting parameter, obtained numerical value is the C value of ground color below current sensor.
The transport alarm system of this underground self-navigation of the present invention is dense to underground coal mine integrated environment situation, pyrophoric gas
Degree situation, equipment safety situation and personnel's production operation situation carry out real-time monitoring and utilize alarm when monitoring abnormal conditions
Module sounds an alarm, and independent linking fire device data is uploaded to monitoring center mould in the way of wireless transmission by the present invention
Block, monitoring center module analyze optimal abnormal conditions solution according to the data of acquisition.This system performance is stablized, monitoring effect
Fruit is good, can effectively prevent and avoid the generation of coal-mine fire, is attached by the way of wireless transmission and data pass
It is defeated, have many advantages, such as that delay is short, at low cost, it is safe and reliable.
The present embodiment is only explanation of the invention, is not limitation of the present invention, and those skilled in the art exist
It can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as in the present invention
Scope of the claims in all by the protection of Patent Law.
Claims (9)
1. a kind of transport alarm system of underground self-navigation, including conveyer (1) and monitoring center, conveyer (1) packet
Include control module (2), memory module (3), warning device (4) and the integrated environment acquisition connecting with the control module (2)
Module (5), it is characterised in that: control module (2) signal connects the integrated environment acquisition module (5) and the storage mould
Block (3), integrated environment acquisition module (5) signal connect the warning device (4), and the conveyer (1) further includes and controls
Wireless module (6), color detection module (7) and the road sign that molding block (2) is connected, the conveyer (1) pass through described wireless
Module (6) is connect with the monitoring center signal, the road sign include be layed in along travelling route different location ground, with ground
Face color distinguishes apparent pure color colour band；The color detection module (7) is used to detect the face immediately below the conveyer (1)
Color, and the colouring information that will test is sent to direction of advance of the control module (2) to correct the conveyer (1).
2. a kind of transport alarm system of underground self-navigation as described in claim 1, it is characterised in that: integrated environment acquisition
Module (5) includes gas concentration monitoring modular (51), equipment safety monitoring modular (52), double band fire detecting device (53) and view
Frequency monitoring module (54)；The gas concentration monitoring modular (51), the equipment safety monitoring modular (52), two waveband fire
Fire detector (53) and video monitoring module (54) are bi-directionally connected with the monitoring center.
3. a kind of transport alarm system of underground self-navigation as described in claim 1, it is characterised in that: the color detection
Module (6) be set to the conveyer (1) bottom, including perpendicular to the direction of advance of the conveyer (1) be equidistantly arranged side by side in
At least four sensors of conveyer (1) bottom surrounding, between the first sensor and the 4th sensor away from
From the width for being slightly less than the colour band, the first sensor to the 4th sensor RGB of ground color below for identification
Value, and this rgb value is sent to the control module, the rgb value on the collected ground of four sensors from left to right according to
Secondary is first to fourth rgb value, and the control module (2) corrects the direction of advance of the conveyer according to the rgb value received.
4. a kind of transport alarm system of underground self-navigation according to claim 3, which is characterized in that the colour band warp
Each machine plotting side is crossed, and the colour band surface by colour band starting point, colour band terminal and each machine plotting is respectively arranged with a color lump, the color
Band is pure color with each color lump, and its color is all different；The colour band and the rgb value of the color of each color lump are preparatory
It saves to the control module (2).
5. a kind of guide system of intelligent navigation according to claim 4, which is characterized in that the colour band is close ring
Road, the colour band starting point and colour band terminal are identified using same color lump.
6. a kind of transport alarm system of underground self-navigation as described in claim 1, it is characterised in that: the memory module
It (3) include NAND FLASH memory and SDRAM memory, integrated environment capture program (5) and map datum are stored in NAND
In FLASH memory.
7. a kind of transport alarm system of underground self-navigation as described in claim 1, it is characterised in that: the conveyer
(1) include:
The ultrasonic sensor (11), for measure conveyer (1) with barrier or between the walls at a distance from, realize avoidance
Function, while auxiliary positioning data being also provided；
The infrared sensor (12), for preventing from falling in conveyer (1) course of work from eminence.
8. a kind of transport alarm system of underground self-navigation as claimed in claim 2, it is characterised in that: the gas is dense
Spending monitoring modular (51) includes methane transducer, carbon monoxide transducer, oxygen sensor and sensor of dust concentration.
9. a kind of transport alarm system of underground self-navigation as claimed in claim 2, it is characterised in that: the equipment safety
Monitoring modular (52) includes smoke sensor device, temperature sensor and flame detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810940837.2A CN108999639A (en) | 2018-08-17 | 2018-08-17 | A kind of transport alarm system of underground self-navigation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810940837.2A CN108999639A (en) | 2018-08-17 | 2018-08-17 | A kind of transport alarm system of underground self-navigation |
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| Publication Number | Publication Date |
|---|---|
| CN108999639A true CN108999639A (en) | 2018-12-14 |
Family
ID=64593535
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810940837.2A Pending CN108999639A (en) | 2018-08-17 | 2018-08-17 | A kind of transport alarm system of underground self-navigation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116701412A (en) * | 2023-08-07 | 2023-09-05 | 中煤科工集团信息技术有限公司 | Mining data storage system |
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| CN1664312A (en) * | 2005-01-07 | 2005-09-07 | 辽宁工程技术大学 | Apparatus and method for monitoring spontaneous fire of mine |
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Application publication date: 20181214 |