CN109026118A - A kind of mine air-door and its application method - Google Patents
A kind of mine air-door and its application method Download PDFInfo
- Publication number
- CN109026118A CN109026118A CN201811156564.9A CN201811156564A CN109026118A CN 109026118 A CN109026118 A CN 109026118A CN 201811156564 A CN201811156564 A CN 201811156564A CN 109026118 A CN109026118 A CN 109026118A
- Authority
- CN
- China
- Prior art keywords
- door
- air
- door body
- air door
- 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
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/10—Air doors
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
A kind of mine air-door of the invention and its application method, belong to pit mining technical field, which includes doorframe and door body, and doorframe is arranged in wall, and door body is arranged in doorframe, and pressure relief window is provided in door body, and the air door is arranged two groups.Application method are as follows: when have pedestrian by need to open air door when, open first of door body pressure relief window after, open first of door body；After pedestrian enters twice door body centre, first of air door and pressure relief window are closed, second air door is run to；Second door body pressure relief window is opened, and opens second door body, after second door body, closes second door body and pressure relief window, twice door body is in closed state at this time, blocks distinguished and admirable.Mine air-door structure of the invention is simple, convenient and reliable operation can be avoided air door deformation and air leakage in roadway caused by air door is not closed completely, and solve the problems, such as that generally existing air door inside and outside differential pressure is larger, it is inconvenient to open, the installation operation for simplifying air door, reduces installation cost.
Description
Technical field
The invention belongs to pit mining technical fields, and in particular to a kind of mine air-door and its application method.
Background technique
Nowadays, with the continuous development and progress of technology, various air doors in many styles have been emerged in existing mine
In, at belt conveyer head, electromechanical chamber, working face open-off cut etc., for mining ventilation and safety, not only meeting tunnel support strength but also
Meet pedestrian conveniently to pass through, consider frequently with build support wall, under the premise of ensuring that mine ventilation system is stablized, in wall
Inside be respectively provided with wooden small air door, small air door usually by belt cushion rubber, doorframe, door body, etc. form, door and door body are installed in fire dam
In vivo, optoelectronic switch processor is installed on disengaging air door middle position, since per pass door body in the prior art is when opening,
When wind pressure is larger, it is highly difficult that pedestrian opens small air door, and can not be closed sometimes tightly in pedestrian by rear wooden air door, door
There are gaps between body and door leaf, be easy to cause air leakage in roadway, will lead to the deformation of air door door body under Action of Wind pressure for a long time, into
It and is that production brings major safety risks.In addition, being not easy during air door use once there is the severely deformed push-and-pull of air door
When, it can also normally be produced to underground and bring very big inconvenience, severely impact production efficiency.
Summary of the invention
In order to solve the problems in the prior art, the purpose of the present invention is to provide a kind of mine air-door and its application method, the wind
Door can not only avoid traditional wooden air door from being not closed completely, air leakage in roadway, air door are easy to damage caused by poor durability, moreover it is possible to
Enough solve the problems, such as that air door is caused to be not easy to open due to wind pressure.
To achieve the above object, the invention adopts the following technical scheme:
A kind of mine air-door, including doorframe and door body, wherein the doorframe is arranged in wall, and the door body is set
It sets in doorframe, pressure relief window is provided in the door body, the air door is arranged two groups.
What the door body was bonded with doorframe is surrounded by sealing joint strip, to improve leakproofness when air door is closed, avoids
Air leakage in roadway phenomenon.
The door body opening direction is reversed opens.
The door body thickness can effectively guarantee air door anti-pressure ability and use intensity, avoid in long-time service or wind
When pressing active force excessive, the service life of air door is influenced.
The door body is with a thickness of 1.4~1.8mm.
The air door material is steel or irony.
Electromagnetism valve blocking is provided in the door body, the electromagnetism valve blocking is for controlling air door folding.
The electromagnetism valve blocking is the dedicated explosion-proof electromagnetic valve blocking in mine.
Infrared sensor is also connected on the electromagnetism valve blocking.
The infrared sensor is the dedicated explosion-proof infrared sensor in mine.
The infrared sensor includes infrared emission end and infrared receiver end.
The infrared sensor is used to control down the electromagnetism valve blocking of one of air door, specifically, when this group of door opening,
Infrared sensor signal disconnects, and lower one of air door electromagnetism valve blocking is in closed state, after this group of air door is closed, infrared sensing
Device signal is connected, and the unlatching of lower one of air door electromagnetism valve blocking passes through convenient for pedestrian, and when return operates identical, wherein with pedestrian's row
Walk the direction that direction is next sect.
The infrared emission end is mounted in door body, the infrared receiver end be oppositely arranged on doorframe.
The infrared emission end, infrared receiver end and electromagnetism valve blocking are on the same line, facilitate infrared ray
Signal transmitting and reception.
The air door is equipped with photoelectric comprehensive processing unit, the described photoelectric comprehensive processing unit connection electromagnetism valve blocking and
Infrared sensor, on the disposed proximally tunnel wall of the photoelectric comprehensive processing unit.
The photoelectric comprehensive processing unit is used to provide power supply and with signal for infrared sensor and electromagnetism valve blocking
Processing function.
Phonetic alarm is installed in the photoelectric comprehensive processing unit.
The phonetic alarm is mine explosion-proof special alarm.
The pressure relief window and door body is integrally formed, and the pressure relief window opening ways are that push-and-pull is opened, and push-pull fashion is
Level push-and-pull or vertical push-and-pull, are welding as one when processing air door with iron plate, channel steel and door body.
The door body is equipped with slideway, to push and pull for pressure relief window.
The pressure relief window is thin slice identical with door body material, and for the pressure relief window with a thickness of 1.4mm, size is length
25mm- wide 18mm.
The door body and doorframe assembles on ground, and underground is mounted directly, convenient, simple.
The temporary airtight wall that the air door is applied to Ventilation Control and mine support is constructed, passes through needs according to pedestrian
And it is arranged.
A kind of application method of mine air-door, comprising the following steps:
(1) when have pedestrian by need to open air door when, open first of door body pressure relief window after, open first of door body；
(2) after pedestrian enters twice door body centre, first of air door and pressure relief window is closed, second air door is run to；
(3) second door body pressure relief window is opened, and opens second door body, after second door body, closes second
Door body and pressure relief window, twice door body is in closed state at this time, blocks distinguished and admirable.
In the step (1), after first of door body is opened, the infrared emission end of the road air door and infrared receiver end signal
It disconnects, second air door solenoid valve block action makes second air door automatic blocking.
In the step (2), after first of door body is closed, the infrared emission end of the road air door and infrared receiver end signal
Restore to receive, second air door solenoid valve block action, opens the locking of second air door, pass through convenient for pedestrian.
In the step (3), after second door body is opened, the infrared emission end of the road door body and infrared receiver end signal
It disconnects, first of air door solenoid valve block action makes first of air door automatic blocking.
In the application method, when needing to open air door, the pressure relief window in the air door door body is first opened, by release,
Air door inside and outside differential pressure is balanced, air door can be opened easily later.
Air door is the important structures in mine ventilation system, its partition is distinguished and admirable, creates item for mine air distribution according to need
Part, while being provided conveniently for pedestrian and transport again.The most basic requirement that air door must satisfy is: 1. labor-saving opening, convenient and peace
Entirely；2. can be automatically closed；3. sealing is tight everywhere, do not leak out；4. every group of air door is no less than twice, and blocking device is housed, no
It can open wide simultaneously；5. Air escape branch when to prevent back lass, the air door of main air flow will install reverse throttle.
Pressure difference concept is proposed according to mine ventilation pressure and atmospheric dynamics.Pressure difference refers to exterior window room on architecture
The difference of air pressure suffered by surfaces externally and internally.When outdoor face air pressure is greater than chamber internal surface, pressure difference is set to just
Value；Otherwise to determine negative value.
Beneficial effects of the present invention:
(1) mine air-door structure of the invention is simple, convenient and reliable operation, can be avoided caused by air door is not closed completely
Air door deformation and air leakage in roadway.
(2) mine air-door of the invention solves the problems, such as that generally existing air door inside and outside differential pressure is larger, it is inconvenient to open, and simplifies
The installation operation of air door, reduces installation cost.
(3) mine air-door of the invention is made of irony or steel, can achieve fire prevention instead of the small air door of conventional wooden,
Corrosion-resistant purpose.
(4) mine air-door usage range of the invention is wide, can generally use in the same circumstances in mine, service life
It is long, ventilation patrol officer's labor intensity is reduced, worker's enthusiasm is increased.
(5) mine air-door of the invention can be avoided economic loss and accident harm caused by coal mine underground air door damage,
It realizes securely and reliably, has high economic benefit simultaneously.
Detailed description of the invention
Fig. 1 is a kind of apparatus structure schematic diagram of mine irony air door of the embodiment of the present invention 1；
Fig. 2 is a kind of device side structure schematic diagram of mine irony air door of the embodiment of the present invention 1, in which:
1- doorframe；2- door body；3- air door handle；4- release window handle；5- electromagnetism valve blocking；6- pressure relief window；7- slideway；8-
Infrared sensor；9- shaft, 10- photoelectric comprehensive processing unit, A- wall.
Specific embodiment
The present invention is described in further details with specific embodiment with reference to the accompanying drawing, described is to solution of the invention
It releases rather than limits.
A kind of mine irony air door, apparatus structure schematic diagram as shown in Figure 1, side structure schematic diagram as shown in Fig. 2, including
Doorframe 1 and door body 2, wherein the doorframe 1 is arranged in wall A, and the door body 2 is arranged in doorframe 1, the door
Pressure relief window is provided on body 2, the air door is arranged two groups；
The air door includes shaft 9, is equipped with air door handle 3, improves flexibility and convenience that air door uses whereby；
The door body 2 is surrounded by sealing joint strip with what doorframe 1 was bonded, to improve leakproofness when air door is closed, keeps away
Exempt from air leakage in roadway phenomenon；
2 opening direction of door body is reversed unlatching, Air escape branch when preventing back lass；
The door body 2 can effectively guarantee air door anti-pressure ability and use intensity, avoid in length with a thickness of 1.4mm
When phase use or excessive Action of Wind pressure power, the service life of air door is influenced；
It is provided with electromagnetism valve blocking 5 in the door body 2, for controlling air door folding, is also connected on the electromagnetism valve blocking 5
There is infrared sensor 8, the infrared sensor 8 continuously issues infrared ray, and the electromagnetism valve blocking 5 is that mine is dedicated anti-
Quick-fried electromagnetism valve blocking 5；
The infrared sensor 8 is the dedicated explosion-proof infrared sensor 8 in mine, including infrared emission end and infrared receiver
End, the infrared emission end is mounted in door body 2, the infrared receiver end be oppositely arranged on doorframe 1；
The electromagnetism valve blocking 5 that the infrared sensor 8 is used to control down one of air door switchs, specifically, this group of air door
When unlatching, 8 signal of infrared sensor is disconnected, and lower one of air door electromagnetism valve blocking 5 is in closed state, when this group of air door is closed
Afterwards, 8 signal of infrared sensor is connected, and the unlatching of lower one of air door electromagnetism valve blocking 5 passes through convenient for pedestrian, when return operate it is identical,
It wherein, is the direction at next sect with pedestrian's direction of travel；
The air door is equipped with photoelectric comprehensive processing unit 10, and the photoelectric comprehensive processing unit 10 connects solenoid valve and closes
Lock 5 and infrared sensor 8, for providing power supply and with signal processing function, institute for infrared sensor 8 and electromagnetism valve blocking 5
The photoelectric comprehensive processing unit 10 stated is hung on the upside of tunnel, is avoided by accidental injury, the power supply of optoelectronic switch sensor takes
Illuminating comprehensive protecting switch nearby is made, using 127V electric control；
Phonetic alarm is installed in the photoelectric comprehensive processing unit 10, which is that mine explosion-proof is dedicated
Alarm；
The pressure relief window 6 and door body 2 is integrally formed, and the pressure relief window opening ways are that push-and-pull is opened, push-pull fashion
For level push-and-pull or vertical push-and-pull, it is welding as one when processing air door with iron plate, channel steel and door body 2；
The door body 2 is equipped with slideway 7, butter on slideway 7, it is ensured that pressure relief window push-and-pull is convenient；
The pressure relief window is equipped with release window handle 4, and the pressure relief window is irony thin slice, and with a thickness of 1.4mm, size is
Long 25mm, wide 18mm；
The door body 2 and doorframe 1 assembles on ground, and underground is mounted directly, convenient, simple；
A kind of application method of mine air-door, comprising the following steps:
Heap puzzles the fire dam being made of cement and masonry at working face location of cut, main entry and the perforation of belt lane,
It would generally be imported and exported in tunnel and install two sides fire dam, this example mine air-door is installed on the right side of fire dam, infrared hair is adjusted
End is penetrated, infrared receiver end and electromagnetism valve blocking are on the same line, facilitate the signal of infrared ray to emit and receive, it is ensured that close
Lock is reliable；
(1) when have pedestrian by need to open air door when, open first of door body pressure relief window after, open the first sect
Body, after first of door opening, the infrared emission end of the road air door and infrared receiver end signal are disconnected, second air door solenoid valve
Block action makes second air door automatic blocking；
(2) after pedestrian enters twice door body centre, such as the first sect is not turned off, and phonetic alarm will alarm, together
When second air door electromagnetism valve blocking must not open, after first door body and pressure relief window are closed, the infrared emission end of the road air door
Restore to receive with infrared receiver end signal, second air door solenoid valve block action, opens the locking of second air door, convenient for row
People passes through, and runs to second air door；
(3) pressure relief window of second door body is opened, and opens second door body, after second door body is opened, the road door body
Infrared emission end and infrared receiver end signal disconnect, first of air door solenoid valve block action close first of air door automatically
Lock, while alarm is blown a whistle, and after second door body, closes second door body and pressure relief window, the infrared emission of the second fan door
End is connected to infrared receiver end signal, and Yishanmen electromagnetism valve blocking is opened, and alarm stops, and twice door body is in closing at this time
State blocks distinguished and admirable；
In use, by opening the pressure relief window in corresponding air door door body, by release, keep air door inside and outside differential pressure flat
Weighing apparatus, can open air door easily later.
Inflow rate of mine water is larger in the present embodiment, will be in the wall bottom right constructed to prevent the closed internal water accumulation of underground gushing water
Two small weapon pipes are buried at angle for discharging water.
It will be understood by those skilled in the art that the thickness of the above-mentioned material for being used to prepare the mine air-door and material
It is only a preferred embodiment of the present invention, the present invention can also be prepared using other materials known in those skilled in the art
Mine air-door, details are not described herein again.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations, although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that it still can be with
It modifies the technical solutions described in the foregoing embodiments, or part of technical characteristic is replaced on an equal basis, and
These are modified or replaceed, and the range for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution is
It can.
Claims (10)
1. a kind of mine air-door, which is characterized in that including doorframe and door body, wherein the doorframe is arranged in wall, described
Door body be arranged in doorframe, be provided with pressure relief window in the door body, the air door is arranged two groups.
2. mine air-door according to claim 1, which is characterized in that the air door material is steel or irony.
3. mine air-door according to claim 1, which is characterized in that be provided with electromagnetism valve blocking, institute in the door body
The electromagnetism valve blocking stated is for controlling air door folding.
4. mine air-door according to claim 1, which is characterized in that be also connected with infrared biography on the electromagnetism valve blocking
Sensor, the infrared sensor include infrared emission end and infrared receiver end, and the infrared emission end is mounted in door body,
The infrared receiver end be oppositely arranged on doorframe.
5. mine air-door according to claim 1, which is characterized in that the infrared emission end, infrared receiver end and electricity
Magnet valve locking is on the same line, and the signal of infrared ray is facilitated to emit and receive.
6. mine air-door according to claim 1, which is characterized in that the air door is equipped with photoelectric comprehensive processing unit,
The photoelectric comprehensive processing unit connection electromagnetism valve blocking and infrared sensor, the photoelectric comprehensive processing unit setting exist
On the wall of neighbouring tunnel, for providing power supply and with signal processing function for infrared sensor and electromagnetism valve blocking.
7. the application method of mine air-door described in claim 1, which comprises the following steps:
(1) when have pedestrian by need to open air door when, open first of door body pressure relief window after, open first of door body；
(2) after pedestrian enters twice door body centre, first of air door and pressure relief window is closed, second air door is run to；
(3) second door body pressure relief window is opened, and opens second door body, after second door body, closes second door body
And pressure relief window, twice door body is in closed state at this time, blocks distinguished and admirable.
8. the application method of mine air-door as claimed in claim 7, which is characterized in that in the step (1), first of door body
After unlatching, the infrared emission end of the road air door and infrared receiver end signal are disconnected, second air door solenoid valve block action, make the
Two air door automatic blockings.
9. the application method of mine air-door as claimed in claim 7, which is characterized in that in the step (2), first of door body
After closing, the infrared emission end of the road air door and infrared receiver end signal restore to receive, second air door solenoid valve block action,
The locking of second air door is opened, is passed through convenient for pedestrian.
10. the application method of mine air-door as claimed in claim 7, which is characterized in that in the step (3), the second sect
After body is opened, the infrared emission end of the road door body and infrared receiver end signal are disconnected, and first of air door solenoid valve block action makes
First of air door automatic blocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811156564.9A CN109026118A (en) | 2018-09-30 | 2018-09-30 | A kind of mine air-door and its application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811156564.9A CN109026118A (en) | 2018-09-30 | 2018-09-30 | A kind of mine air-door and its application method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109026118A true CN109026118A (en) | 2018-12-18 |
Family
ID=64615709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811156564.9A Pending CN109026118A (en) | 2018-09-30 | 2018-09-30 | A kind of mine air-door and its application method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109026118A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397465A (en) * | 2019-06-28 | 2019-11-01 | 江南大学 | A kind of coal working face full blast amount cooling system and method |
| CN110439606A (en) * | 2019-08-30 | 2019-11-12 | 贵州大学 | A kind of pressure release type protrusion-dispelling air door |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6425820B1 (en) * | 2000-03-30 | 2002-07-30 | Jack Kennedy Metal Products And Buildings, Inc. | Mine door power drive system |
| CA2348348C (en) * | 2001-02-20 | 2006-10-03 | Wayne William Kitching | Balanced ventilation doors |
| CN2835558Y (en) * | 2005-07-21 | 2006-11-08 | 新汶矿业集团汶南煤矿有限责任公司 | Pressure-resistant easy-to-open locking air door for mine |
| CN101012754A (en) * | 2007-01-30 | 2007-08-08 | 山东中大机械制造有限公司 | Automatic switching pneumatic interlocking crashproof air door and control method thereof |
| CN201025060Y (en) * | 2007-01-30 | 2008-02-20 | 山东中大机械制造有限公司 | Automatic switch gas interlocking collision preventive wind door |
| CN102953746A (en) * | 2012-12-06 | 2013-03-06 | 枣庄矿业（集团）有限责任公司蒋庄煤矿 | Automatic safe air door |
| CN203347826U (en) * | 2013-07-02 | 2013-12-18 | 济南中盾电气设备有限公司 | Mining double air door control device |
-
2018
- 2018-09-30 CN CN201811156564.9A patent/CN109026118A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6425820B1 (en) * | 2000-03-30 | 2002-07-30 | Jack Kennedy Metal Products And Buildings, Inc. | Mine door power drive system |
| CA2348348C (en) * | 2001-02-20 | 2006-10-03 | Wayne William Kitching | Balanced ventilation doors |
| CN2835558Y (en) * | 2005-07-21 | 2006-11-08 | 新汶矿业集团汶南煤矿有限责任公司 | Pressure-resistant easy-to-open locking air door for mine |
| CN101012754A (en) * | 2007-01-30 | 2007-08-08 | 山东中大机械制造有限公司 | Automatic switching pneumatic interlocking crashproof air door and control method thereof |
| CN201025060Y (en) * | 2007-01-30 | 2008-02-20 | 山东中大机械制造有限公司 | Automatic switch gas interlocking collision preventive wind door |
| CN102953746A (en) * | 2012-12-06 | 2013-03-06 | 枣庄矿业（集团）有限责任公司蒋庄煤矿 | Automatic safe air door |
| CN203347826U (en) * | 2013-07-02 | 2013-12-18 | 济南中盾电气设备有限公司 | Mining double air door control device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397465A (en) * | 2019-06-28 | 2019-11-01 | 江南大学 | A kind of coal working face full blast amount cooling system and method |
| CN110397465B (en) * | 2019-06-28 | 2024-03-26 | 江南大学 | Full air volume cooling system and method for coal face |
| CN110439606A (en) * | 2019-08-30 | 2019-11-12 | 贵州大学 | A kind of pressure release type protrusion-dispelling air door |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109026118A (en) | A kind of mine air-door and its application method | |
| CN108468850A (en) | The closed gas pumping control device of underground coal mine | |
| CN207177687U (en) | The leakage proof system of Energy Saving Windows | |
| CN209586022U (en) | A kind of intelligent patrol detection track partition door self-con-tained unit | |
| CN212837374U (en) | Double-translation door type one-way door capable of preventing reverse passing and reverse article transfer | |
| CN204960726U (en) | Automatic fireproof curtain of steel | |
| CN101749048A (en) | Subway siding partition door | |
| CN203603967U (en) | Emergent hoisting system of vertical air return shaft | |
| CN202002279U (en) | Remote control multi-vane smoke exhausting and air supplying outlet | |
| CN209539139U (en) | A kind of multi-functional civil air defense constructions and installations protective door | |
| CN202126136U (en) | Door body locking device for refrigerator and refrigerator | |
| CN206220050U (en) | Flood and people's air defense gate | |
| CN102513323B (en) | Fume exhaust layout structure for subway platform and screen door system | |
| CN105561511A (en) | Large-angle door opening structure of hidden fire hydrant | |
| CN104819009A (en) | Closed excavation roadway opening and high concentration hydrogen sulfide and gas treatment method | |
| CN212105633U (en) | Novel fire-resistant insulated door | |
| CN109404036A (en) | A kind of tunnel fire hazard resistance cigarette drenching installation | |
| CN219974545U (en) | Pressure air supply and pressure relief system for connecting channel between overlapping sections | |
| CN207988787U (en) | A kind of self-reflection type fire resistant doorsets detection device | |
| CN207620654U (en) | Fire wall automatic disconnecting device | |
| CN218346976U (en) | Indoor ski field and air brake room suitable for main inlet of cold and warm area of indoor ski field | |
| CN213418952U (en) | Fireproof rolling shutter door | |
| CN213900081U (en) | Fireproof smoke exhaust valve | |
| CN219261314U (en) | Evacuation structure for underground space building connection channel | |
| CN103541759B (en) | Emergency hoisting system for air return shaft of vertical shaft |
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 |
Application publication date: 20181218 |
|
| RJ01 | Rejection of invention patent application after publication |