CN108643961A - A kind of coal mine underground emergency and fresh air system - Google Patents
A kind of coal mine underground emergency and fresh air system Download PDFInfo
- Publication number
- CN108643961A CN108643961A CN201810492686.9A CN201810492686A CN108643961A CN 108643961 A CN108643961 A CN 108643961A CN 201810492686 A CN201810492686 A CN 201810492686A CN 108643961 A CN108643961 A CN 108643961A
- Authority
- CN
- China
- Prior art keywords
- corridor
- danger prevention
- urgent danger
- fresh air
- coal mine
- 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.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F11/00—Rescue devices or other safety devices, e.g. safety chambers or escape ways
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
- F24F8/15—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means
- F24F8/158—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering by chemical means using active carbon
Abstract
A kind of coal mine underground emergency and fresh air system, the urgent danger prevention and fresh air system include urgent danger prevention corridor and closing solar, the urgent danger prevention corridor is arranged in pedestrian tunnel, one end is connected to the closing solar, the other end leads to return air main entry, and the return air main entry is connected to returnairshaft;The urgent danger prevention corridor is multistage docking connection;The side in downcast is arranged in the closing solar, and the closing solar entrance is provided with air cleaning unit, and air is entered using mine ventilation negative pressure in the urgent danger prevention corridor after the air cleaning unit.Pedestrian's urgent danger prevention corridor is arranged in the present invention in pedestrian tunnel, can not only staff's urgent danger prevention is used as to use, but also can ensure that staff breathes fresh wind, dual-use material at work.
Description
Technical field
The present invention relates to a kind of emergency hedge system, especially a kind of coal mine underground emergency and fresh air system.
Background technology
In coal mine underground recovery process, inevitably generates some pernicious gases and be discharged in tunnel in air, cause
Pollution to tunnel air, and there is the danger that the disasters such as mine water, gas, Period of Coal Seam Spontaneous Combustion, coal-dust explosion occur.Cause
This, national security supervisory department requires each underground mine setting downhole safety avoiding system and refuge chamber(Cabin), downhole safety
Avoiding system and refuge chamber(Cabin)It is equipped as coal mine safety emergency rescue, can be to withdraw in time when disaster occurs
The staff of mine provides a closed living space.But have relatively long distance between existing chamber and chamber, and take refuge
Apart from sometimes, farther out, if urgent disaster occurs, all personnel is difficult to timely enter promptly to keep away to chamber with staff job site
Dangerous chamber.In addition, existing underground work environment is poor, the frequent quick-fried table of down-hole mining working face PM10, PM2.5, staff
Certainly anti-with dust mask, still, actually underground work personnel are difficult to wear dust mask during entire work, this just makes
It is greatly increased at underground work personnel's illness probability.Therefore research and development one kind is needed to make staff both can be tight when disaster occurs
Anxious hedging can breathe the facility of fresh air at work again.
Invention content
The present invention in view of the drawbacks of the prior art, proposes a kind of coal mine underground emergency and fresh air system, in pedestrian lane
Pedestrian's urgent danger prevention corridor is set in road, is connected by quick coupling between each section of urgent danger prevention corridor, and with sealed in downcast
Solar connection is closed, when ensureing that emergency occurs, personnel can quickly enter progress hedging in urgent danger prevention corridor, and pass through
It closes solar and returns to ground;Fresh wind in urgent danger prevention corridor after pass purification, is effectively improved the building ring of staff
Border ensures that staff can have a breath of fresh air with during hedging during operation.
To achieve the above object, the present invention adopts the following technical scheme that:
A kind of coal mine underground emergency and fresh air system, the urgent danger prevention and fresh air system include urgent danger prevention corridor and envelope
Solar is closed, the urgent danger prevention corridor is arranged in pedestrian tunnel, and one end is connected to the closing solar, and the other end leads to
Return air main entry, return air main entry are connected to returnairshaft;The urgent danger prevention corridor is multistage docking connection;The closing solar is set
The side in downcast is set, the closing solar entrance is provided with air cleaning unit, and air is net by the air
Makeup, which is postponed, to be entered using mine ventilation negative pressure in the urgent danger prevention corridor.
Above-mentioned coal mine underground emergency and fresh air system, per 2 ~ 6m of segment length, adjacent two sections tight in the urgent danger prevention corridor
It is connected by quick coupling between anxious hedging corridor, and is sealed by gasket, the gasket is flexible flame retardant material
Manufactured gasket.
Above-mentioned coal mine underground emergency and fresh air system, the air cleaning unit include the prefilter set gradually
Net, activated charcoal strainer and efficient HEPA filter screens.
Above-mentioned coal mine underground emergency and fresh air system, the urgent danger prevention corridor are the totally-enclosed of tunnel side shape
Tubulose, top are flat-top or arch top, and fixation is supported by the support frame being vertically arranged;The urgent danger prevention is walked
Corridor inner width is 0.8-1.2m, interior a height of 1.6-2.2m.
Above-mentioned coal mine underground emergency and fresh air system, every opening in 100m is provided on the urgent danger prevention corridor
Door, the inward swinging door are rectangular, width 0.8m-1.2m, are highly 1.4m-1.8m.
Above-mentioned coal mine underground emergency and fresh air system, the urgent danger prevention corridor are oval tubular, the support rib
Frame is fixed in the shape of a spiral on the inner wall of the urgent danger prevention corridor;The a length of 1.6- of the urgent danger prevention corridor vertical direction long axis
2.2m, a length of 0.8-1.2m of horizontal direction short axle.
Above-mentioned coal mine underground emergency and fresh air system, the inward swinging door are set as ellipse, the long axial length of vertical direction
For 1.6-2m, a length of 0.8-1m of horizontal direction short axle.
Above-mentioned coal mine underground emergency and fresh air system are provided with mine exhaust ventilation at the returnairshaft air outlet
The exhausting air quantity of machine, the ventilation blower is 30-300m3/s。
Above-mentioned coal mine underground emergency and fresh air system are provided with lighting system in the urgent danger prevention corridor.
Above-mentioned coal mine underground emergency and fresh air system, the corridor walls are anticorrosive steel wooden partition, and the support frame is
Steel skeleton.
Multistage urgent danger prevention corridor is arranged in the present invention in pedestrian tunnel, passes through fast quick access between each section of urgent danger prevention corridor
Head connection, splicing it is convenient and efficient, urgent danger prevention corridor be pedestrian tunnel street crossing at shape totally-enclosed tubulose, sound construction,
Good airproof performance avoids the pernicious gas outside urgent danger prevention corridor from entering in urgent danger prevention corridor;Another urgent danger prevention corridor
It is set as oval cylinder, bearing capacity is stronger, and support frame is arranged in the shape of a spiral on the inner wall of the urgent danger prevention corridor, more surely
Gu;Urgent danger prevention corridor is arranged every 100m by inward swinging door, and personnel is facilitated to come in and go out;Urgent danger prevention corridor connects with closing solar
It connects, when ensureing that emergency occurs, personnel can quickly enter progress hedging in urgent danger prevention corridor, and by closing solar
Return to ground;Closing solar air inlet is provided with air cleaning unit, and purified air is entered tight using mine negative pressure
In anxious hedging corridor, ensures that staff can breathe fresh air during operation, be effectively improved the work of staff
Environment, meanwhile, ensure that hedging personnel can also have a breath of fresh air during hedging.Urgent danger prevention corridor of the present invention can both expire
Sufficient staff's urgent danger prevention is used, while can meet staff's breathing again to fresh air, dual-use material.
Description of the drawings
Fig. 1 is present system structural schematic diagram;
Fig. 2 is underground main entry section structure diagram;
Fig. 3 is A-A cross-sectional views in Fig. 2;
Fig. 4 is downcast section structure diagram;
Fig. 5 is B-B cross-sectional views in Fig. 4;
Fig. 6 is underground main entry section another kind structural schematic diagram;
Fig. 7 is C-C cross-sectional views in Fig. 6.
Each list of reference numerals is in figure:1, urgent danger prevention corridor;1-1, inward swinging door;1-2, support frame;1-3, partition board;2, it seals
Close solar;3, pedestrian tunnel;4, return air main entry;5, returnairshaft;6, downcast;7, air cleaning unit;8, stope;
9, driving face;.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment the invention will be further described.
Embodiment 1
Referring to Fig. 1 ~ Fig. 5, coal mine underground emergency and fresh air system of the present invention include urgent danger prevention corridor 1 and closing solar
2, the urgent danger prevention corridor 1 is arranged in pedestrian tunnel, and one end is connected to the closing solar 2, and the other end leads to return air
Main entry 4, return air main entry 4 are connected to returnairshaft 5;The urgent danger prevention corridor 1 is the totally-enclosed tubulose of tunnel side shape, top
Portion is flat-top or arch top, is barricaded as by corrosion preventing steel plate, and the support frame 1-2 for the steel being arranged by vertical direction is propped up
Support is fixed, and in case of emergency, pernicious gas is avoided to enter in urgent danger prevention corridor 1, and 1 inner width of urgent danger prevention corridor is 0.8-
1.2m, interior a height of 1.6-2.2m;The entire urgent danger prevention corridor 1 of steel-made support skeletal support ensures the secured of urgent danger prevention corridor 1
Property, the urgent danger prevention corridor 1 is multistage docking connection, and 2 ~ 6m is grown in every section of urgent danger prevention corridor, and adjacent two sections of urgent danger preventions are walked
Corridor is connected by quick coupling, and the gasket made of flexible flame retardant material is sealed at quick coupling, easy for installation fast
It is prompt;100m is provided with inward swinging door 1-1 on the urgent danger prevention corridor 1, inward swinging door shape is rectangular, width 0.8m-
1.2m is highly 1.4m-1.8m, staff is facilitated to come in and go out.Urgent danger prevention corridor 1 is arranged in entire pedestrian tunnel 3, is meeting
To in emergency circumstances, staff can be quickly entered in urgent danger prevention corridor 1 by inward swinging door 1-1, prevent unexpected generation;
The side in downcast 6 is arranged in the closing solar 2, and 2 entrance of closing solar is provided with air cleaning unit
7, air cleaning unit 7 includes forward filtering net, activated charcoal strainer and the efficient HEPA filter screens set gradually, multilayer mistake
Filter ensures that air is fresher;It is promptly kept away into described using mine negative pressure by 7 purified air of the air cleaning unit
In dangerous corridor 1.Entire fresh air system does not influence mine general ventilating system.
Embodiment 2
Referring to Fig. 1, Fig. 6 ~ Fig. 7, the urgent danger prevention corridor 1 is set as oval cylinder, and entire urgent danger prevention corridor bearing capacity is more
Greatly, unexpected be collapsed is avoided the occurrence of to cause casualties;Support frame 1-2 is fixed in the shape of a spiral in the urgent danger prevention corridor 1
On wall, helical form support frame bearing capacity bigger so that urgent danger prevention corridor 1 is more firm;The vertical side in the urgent danger prevention corridor 1
To a length of 1.6-2.2m of long axis, a length of 0.8-1.2m of horizontal direction short axle, guarantee personnel normally come in and go out;The urgent danger prevention corridor
1 bottom is provided with partition board 1-3, and personnel walk on partition board 1-3, and uniform intervals are provided with air outlet on the partition board 1-3, fresh
Air is entered by closing solar 2 in partition board down channel, then enters partition board upper run by air outlet, ensures staff
Fresh air can be breathed;100m is provided with elliptical inward swinging door 1-1 on the urgent danger prevention corridor 1, vertically
The a length of 1.6-2m of direction long axis, a length of 0.8-1m of horizontal direction short axle, more saves space, staff is facilitated to come in and go out.Promptly keep away
Dangerous corridor 1 be arranged in entire pedestrian tunnel 3, in the case where an emergency situation is encountered, staff can by inward swinging door 1-1 rapidly into
Enter into urgent danger prevention corridor 1, prevents unexpected generation;The side in downcast 6, the envelope is arranged in the closing solar 2
It closes 2 entrance of solar and is provided with air cleaning unit 7, air cleaning unit 7 includes the forward filtering net set gradually, activity
Charcoal filter screen and efficient HEPA filter screens, multiple filtration ensure that air is fresher;After the purification of the air cleaning unit 7
Air using mine negative pressure enter the urgent danger prevention corridor 1 in.
Fresh air system specific work process is:There are nature pressure differences between the downcast 6 and the returnairshaft 5, can make
For the power of fresh wind circulation.Air after air purification is entered by closing solar 2 in urgent danger prevention corridor 1,
When reaching driving face 9, fresh wind is sent into driving face 9 by air blower;Fresh wind by 8 import of stope into
Enter, idle air is discharged into return air main entry 4 from the outlet of stope 8 again, is discharged finally by returnairshaft 5.Whole system meets
Staff breathes the demand of fresh wind at work.In addition mine exhaust ventilation machine, institute can be provided at 5 mouthfuls of returnairshaft
The exhausting air quantity for stating ventilation blower is 30-300m3/ s can accelerate the velocity of liquid assets of fresh air in urgent danger prevention corridor.Entirely
Fresh air system does not influence mine general ventilating system.
Claims (10)
1. a kind of coal mine underground emergency and fresh air system, characterized in that the urgent danger prevention and fresh air system are including urgent
Hedging corridor(1)And closing solar(2), the urgent danger prevention corridor(1)It is arranged in pedestrian tunnel(3)In, one end with it is described
Close solar(2)Connection, the other end lead to return air main entry(4), the return air main entry(4)With returnairshaft(5)Connection;It is described tight
Anxious hedging corridor(1)It docks and connects for multistage;The closing solar(2)It is arranged in downcast(6)Interior side, the closing
Solar(2)Entrance is provided with air cleaning unit(7), air is by the air cleaning unit(7)It is logical using mine afterwards
Wind negative pressure enters the urgent danger prevention corridor(1)In.
2. coal mine underground emergency according to claim 1 and fresh air system, characterized in that the urgent danger prevention corridor
(1)Per 2 ~ 6m of segment length, connected by quick coupling between adjacent two sections of urgent danger prevention corridors, and be sealed by gasket,
The gasket is gasket made of flexible flame retardant material.
3. coal mine underground emergency according to claim 2 and fresh air system, characterized in that the air cleaning unit
(7)Including forward filtering net, activated charcoal strainer and the efficient HEPA filter screens set gradually.
4. coal mine underground emergency according to claim 3 and fresh air system, characterized in that the urgent danger prevention corridor
(1)For the totally-enclosed tubulose of tunnel side shape, top is flat-top or arch top, passes through the support frame being vertically arranged
(1-2)It is supported fixation;The urgent danger prevention corridor(1)Inner width is 0.8-1.2m, interior a height of 1.6-2.2m.
5. coal mine underground emergency according to claim 4 and fresh air system, characterized in that the urgent danger prevention corridor
(1)100m is provided with inward swinging door on side wall(1-1), the inward swinging door(1-1)To be rectangular, width 0.8m-1.2m is high
Degree is 1.4m-1.8m.
6. coal mine underground emergency according to claim 1 and fresh air system, characterized in that the urgent danger prevention corridor
(1)For oval tubular, support frame(1-2)It is fixed on the urgent danger prevention corridor in the shape of a spiral(1)On inner wall;It is described promptly to keep away
Dangerous corridor(1)The a length of 1.6-2.2m of vertical direction long axis, a length of 0.8-1.2m of horizontal direction short axle.
7. coal mine underground emergency according to claim 5 and fresh air system, characterized in that the inward swinging door(1-1)
It is set as ellipse, a length of 1.6-2m of vertical direction long axis, a length of 0.8-1m of horizontal direction short axle.
8. coal mine underground emergency according to claim 1 and fresh air system, characterized in that the returnairshaft(5)Go out
Mine exhaust ventilation machine is provided at air port, the exhausting air quantity of the ventilation blower is 30-300m3/s。
9. coal mine underground emergency according to claim 1 and fresh air system, characterized in that the urgent danger prevention corridor
(1)Inside it is provided with lighting system.
10. coal mine underground emergency according to claim 4 and fresh air system, characterized in that the urgent danger prevention is walked
Corridor(1)Corridor walls be anticorrosive steel wooden partition, the support frame be steel skeleton.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810492686.9A CN108643961A (en) | 2018-05-22 | 2018-05-22 | A kind of coal mine underground emergency and fresh air system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201810492686.9A CN108643961A (en) | 2018-05-22 | 2018-05-22 | A kind of coal mine underground emergency and fresh air system |
Publications (1)
Publication Number | Publication Date |
---|---|
CN108643961A true CN108643961A (en) | 2018-10-12 |
Family
ID=63757464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201810492686.9A Pending CN108643961A (en) | 2018-05-22 | 2018-05-22 | A kind of coal mine underground emergency and fresh air system |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN108643961A (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102003202A (en) * | 2010-10-15 | 2011-04-06 | 北京中煤矿山工程有限公司 | Safety emergency rescue and escape system for mine and construction steps thereof |
CN203962032U (en) * | 2014-07-25 | 2014-11-26 | 林勇 | Tunnel type escape means system under coal mine |
CN105525944A (en) * | 2016-01-19 | 2016-04-27 | 沈阳建筑大学 | Mine escape system |
CN205277487U (en) * | 2016-01-19 | 2016-06-01 | 沈阳建筑大学 | Mine escape pipeline |
CN205714270U (en) * | 2016-02-01 | 2016-11-23 | 王化平 | Tunnel, the lifesaving appliance in tunnel |
CN206972288U (en) * | 2017-05-12 | 2018-02-06 | 任浩 | A kind of coalmine ventilation life saving pipeline |
CN207212387U (en) * | 2017-09-10 | 2018-04-10 | 沈阳建筑大学 | A kind of deep layer Tunnel Ventilation System for having escaping function concurrently |
-
2018
- 2018-05-22 CN CN201810492686.9A patent/CN108643961A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102003202A (en) * | 2010-10-15 | 2011-04-06 | 北京中煤矿山工程有限公司 | Safety emergency rescue and escape system for mine and construction steps thereof |
CN203962032U (en) * | 2014-07-25 | 2014-11-26 | 林勇 | Tunnel type escape means system under coal mine |
CN105525944A (en) * | 2016-01-19 | 2016-04-27 | 沈阳建筑大学 | Mine escape system |
CN205277487U (en) * | 2016-01-19 | 2016-06-01 | 沈阳建筑大学 | Mine escape pipeline |
CN205714270U (en) * | 2016-02-01 | 2016-11-23 | 王化平 | Tunnel, the lifesaving appliance in tunnel |
CN206972288U (en) * | 2017-05-12 | 2018-02-06 | 任浩 | A kind of coalmine ventilation life saving pipeline |
CN207212387U (en) * | 2017-09-10 | 2018-04-10 | 沈阳建筑大学 | A kind of deep layer Tunnel Ventilation System for having escaping function concurrently |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN201412160Y (en) | Single-cave and double-line subway tunnel | |
CN101353968A (en) | Removable emergency rescue capsule for coal mine | |
CN105909303B (en) | Constructing tunnel life saving system | |
CN105840232A (en) | Passive tunnel construction life-saving system | |
CN111140269A (en) | Multi-working-face single-head tunneling ventilation system for metal underground mine infrastructure period | |
CN108561170A (en) | A kind of Tunnel Ventilation System having both escape and fire-proof function | |
CN110566267A (en) | Emergency water curtain refuge house system for subway tunnel | |
CN105909304B (en) | A kind of self-propelled constructing tunnel life saving system | |
CN112412285A (en) | Smoke-isolating purifying fireproof door | |
CN106422609B (en) | A kind of fully automatic multipurpose energy-saving environmental protection device with self-cleaning function | |
CN108798744A (en) | A kind of safety of coal mines energy-saving ventilation system | |
CN108643961A (en) | A kind of coal mine underground emergency and fresh air system | |
CN209042677U (en) | A kind of fire-fighting evacuation stair pressurization ventilating shaft and new ventilating shaft Striping | |
CN2825957Y (en) | Ventilating water supply pipe for emergency | |
CN205779002U (en) | A kind of passive type constructing tunnel life saving system | |
CN101629490B (en) | Full air pressure air borrowing method for coal mine underground tunneling roadway | |
CN211008711U (en) | Novel water sump capable of achieving independent ventilation in underground coal mine | |
CN206581981U (en) | A kind of tunnel smoke duct mounting structure | |
CN209040873U (en) | A kind of ventilation and exhaust device for tunnel fire hazard | |
CN209538776U (en) | A kind of air-raid shelter takes into account the usually mouth optimized structure with ventilation in wartime | |
CN201460965U (en) | Mine escaping system | |
CN212396277U (en) | Pressure air movable type isolation dustproof equipment | |
RU2619577C2 (en) | Personnel collective rescue station | |
Trackemas et al. | Facilitating the use of built-in-place refuge alternatives in mines | |
CN211623479U (en) | Dust device for coal mine production |
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 | ||
RJ01 | Rejection of invention patent application after publication | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181012 |