CN109577765B - Pneumatic locking device for mine air door - Google Patents
Pneumatic locking device for mine air door Download PDFInfo
- Publication number
- CN109577765B CN109577765B CN201811447192.5A CN201811447192A CN109577765B CN 109577765 B CN109577765 B CN 109577765B CN 201811447192 A CN201811447192 A CN 201811447192A CN 109577765 B CN109577765 B CN 109577765B
- Authority
- CN
- China
- Prior art keywords
- air door
- pneumatic
- door
- valve
- air
- 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
- 210000001331 nose Anatomy 0.000 claims abstract description 16
- 238000009423 ventilation Methods 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
- E05C7/00—Fastening devices specially adapted for two wings
- E05C7/02—Fastening devices specially adapted for two wings for wings which lie one behind the other when closed
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B51/00—Operating or controlling locks or other fastening devices by other non-mechanical means
- E05B51/02—Operating or controlling locks or other fastening devices by other non-mechanical means by pneumatic or hydraulic means
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
- E05C7/00—Fastening devices specially adapted for two wings
- E05C7/04—Fastening devices specially adapted for two wings for wings which abut when closed
- E05C7/045—Sliding bolts mounted on or in the edge of a normally closed wing of a double-door or -window
-
- 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
-
- E05Y2999/00—
Abstract
The invention provides a pneumatic locking device for mine air doors, which comprises an A air door, a B air door, a first pneumatic pipeline for controlling the locking of the B air door, and a second pneumatic pipeline for controlling the locking of the A air door, wherein the A air door and the B air door respectively comprise a left air door and a right air door; each group of pipelines are sequentially connected in series with a pneumatic knob valve arranged between two air doors, two lever roller valves arranged on one air door frame in parallel, a pneumatic knob valve arranged on the outer side of the other air door and a spring cylinder on the outer side door frame; a piston rod of the spring cylinder is fixedly provided with a bolt; the bolt is inserted into the lock noses respectively arranged on the left fan door and the right fan door. Compared with the prior art, the device can only utilize the pneumatic system to control the locking of the double-channel double-fan air doors, and can conveniently open the double air doors in an emergency state.
Description
Technical Field
The invention relates to the technical field of mine safety protection, in particular to a pneumatic locking device for a mine air door.
Background
At present, a plurality of mine air door locking devices are provided, and a prior patent 201520767077.1 discloses a coal mine underground air door locking system, as shown in fig. 1, a lever roller type pneumatic valve arranged on the outer surface of one door frame is used for controlling a spring cylinder arranged on the other door, so that the locking of the other air door is realized.
The above-mentioned locking system has the following problems: 1) only can control the double-channel single-fan air door; 2) there is a lack of emergency braking. When two air doors need to be opened, the whole pneumatic pipeline needs to be cut off, the operation is inconvenient, and the influence on other operations needing air is large.
Disclosure of Invention
Aiming at the defects, the invention provides a pneumatic locking device for a mine air door. The device can only utilize the pneumatic system to control the shutting of two-way double-fan air door to in emergency, can conveniently open two air doors.
In order to achieve the above purpose, the invention provides the following technical scheme:
a pneumatic locking device for mine air doors comprises an A air door, a B air door, a first pneumatic pipeline for controlling the locking of the B air door and a second pneumatic pipeline for controlling the locking of the A air door, wherein the A air door and the B air door respectively comprise a left air door and a right air door, the first pipeline is sequentially connected with a first pneumatic knob valve, a first lever roller valve, a second pneumatic knob valve and a first spring cylinder in series, and pipelines at two ends of the first lever roller valve are also connected with a second lever roller valve in parallel; the pipeline II is sequentially connected with a pneumatic knob valve III, a lever roller valve III, a pneumatic knob valve IV and a spring cylinder II in series, and pipelines at two ends of the lever roller valve III are also connected with the lever roller valve IV in parallel; piston rods of the first spring cylinder and the second spring cylinder are respectively and fixedly connected with a first bolt and a second bolt; the first bolt is inserted into a first lock nose respectively arranged on the left air door and the right air door of the air door B; the bolt II is inserted into a lock nose II which is respectively arranged on the left air door and the right air door of the air door A. Two pneumatic knob valves arranged in series can conveniently carry out unlocking operation in an emergency state. Two lever roller valves that the parallelly connected setting, can realize opening arbitrary fan of two air doors about can both lock another air door. The setting of bolt has guaranteed that a spring cylinder just can accomplish the shutting of two air doors about.
Preferably, the first bolt and the second bolt comprise a connecting rod with the middle part connected with the piston rod, and a first blocking rod and a second blocking rod which are fixedly arranged at two ends of the connecting rod; the first blocking rod and the second blocking rod are inserted into the lock nose. The bolt connected by one spring cylinder can be conveniently inserted into the lock noses of the left door and the right door.
Preferably, the first pneumatic knob valve and the third pneumatic knob valve are arranged between the two air doors; the second pneumatic knob valve is arranged on the outer side door frame of the air door of the channel B; and the fourth pneumatic knob valve is arranged on the door frame outside the air door A. The first pneumatic knob valve and the second pneumatic knob valve are arranged on the inner side and the outer side of the air door B, the third pneumatic knob valve and the fourth pneumatic knob valve are arranged on the inner side and the outer side of the air door A, and the air doors can be conveniently unlocked on the inner side and the outer side of the air door in an emergency state.
Preferably, the first lever roller valve and the second lever roller valve are respectively and vertically arranged on a lower door frame of a left air door and a right air door of the A channel, which are close to a middle door seam, and the rollers contact the lower bottom surface of the air door; the third lever roller valve and the fourth lever roller valve are respectively vertically arranged on the lower door frames of the left and right air doors of the air door B near the middle door gap, and the rollers contact the lower bottom surface of the air door; when the air door is opened, the lower bottom surface of the air door is not contacted with the roller of the lever roller valve any more, and the action of the lever roller valve is finished.
Preferably, the first spring cylinder and the second spring cylinder are respectively arranged on the upper door frame between the left air door and the right air door of the air door A and the air door B. The arrangement of the bolt is convenient.
Preferably, the first pneumatic pipeline and the second pneumatic pipeline are branched from the main pneumatic pipeline through a filter. The filter can filter impurity and moisture in the gas, guarantees that the gas circuit is unobstructed.
In the scheme, the invention provides a pneumatic locking device for mine air doors, which comprises an A air door, a B air door, a first pneumatic pipeline for controlling the locking of the B air door, and a second pneumatic pipeline for controlling the locking of the A air door, wherein the A air door and the B air door respectively comprise a left air door and a right air door, and the first pipeline is sequentially connected with a first pneumatic knob valve, a first lever roller valve and a second lever roller valve which are connected in parallel, a second pneumatic knob valve and a first spring cylinder in series; the pipeline II is sequentially connected with a pneumatic knob valve III, a lever roller valve III and a lever roller valve IV which are connected in parallel, a pneumatic knob valve IV and a spring cylinder II in series; piston rods of the first spring cylinder and the second spring cylinder are respectively and fixedly connected with a first bolt and a second bolt; the first bolt is inserted into the first locking noses which are respectively arranged on the left air door and the right air door of the air door B; and the second bolt is inserted into the second locking noses which are respectively arranged on the left air door and the right air door of the air door A. Compared with the prior art, the device can only utilize the pneumatic system to control the locking of the double-channel double-fan air doors, and can conveniently open the double air doors in an emergency state.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art control architecture;
FIG. 2 is a schematic structural diagram of an embodiment of the present invention;
FIG. 3 is an enlarged schematic view at A in FIG. 2;
FIG. 4 is a schematic diagram of a pipeline connection according to an embodiment of the present invention.
Description of reference numerals:
1-A air door, 2-B air door, 3-filter, 4-pneumatic pipeline I, 5-pneumatic pipeline II, 6-pneumatic knob valve I, 7-lever roller valve I, 8-lever roller valve II, 9-pneumatic knob valve II, 10-spring cylinder I, 11-bolt I, 12-B air door lock nose, 13-pneumatic knob valve III, 14-lever roller valve III, 15-lever roller valve IV, 16-pneumatic knob valve IV, 17-spring cylinder II, 18-bolt II, 19-A air door lock nose and 20-pneumatic main pipeline;
1101-connecting rod, 1102-first stop lever, 1103-second stop lever;
1001-high pressure air supply, 1002-A damper lever roller valve, 1003-B damper spring cylinder, 1004-B damper lever roller valve, 1005-A damper spring cylinder.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 2, 3 and 4, the pneumatic locking device for the mine ventilation door provided by the embodiment of the invention comprises an a ventilation door 1 and a B ventilation door 2, wherein each ventilation door comprises a left ventilation door and a right ventilation door. The pneumatic main pipeline 20 is divided into a first pneumatic pipeline 4 for controlling the air door closure of the channel B and a second pneumatic pipeline 5 for controlling the air door closure of the channel A after passing through the filter 3; the pipeline I4 is sequentially connected in series with a pneumatic knob valve I6 arranged between the two air doors, a lever roller valve I7 arranged on a door frame of the air door 1A, a pneumatic knob valve II 9 arranged on a door frame outside the air door 2B and a spring cylinder I10, and pipelines at two ends of the lever roller valve I7 are also connected in parallel with a lever roller valve II 8; the spring cylinder I10 is arranged on an upper door frame between the left air door and the right air door; a piston rod of the spring cylinder I10 is fixedly provided with a bolt I11; the bolt I11 comprises a connecting rod 1101 with the middle part connected with a piston rod of the spring cylinder I10, and a first stop lever 1102 and a second stop lever 1103 which are fixedly arranged at two ends of the connecting rod; the first stop lever 1102 and the second stop lever 1103 are respectively inserted into the B-channel air door locking noses 12 on the left air door and the right air door. The first lever roller valve 7 is vertically arranged on a lower door frame of the left fan air door close to the middle door gap, and the roller contacts the lower bottom surface of the air door. And a second lever roller valve 8 is vertically arranged on the lower door frame of the right air door close to the middle door gap, and the roller contacts the lower bottom surface of the air door. In the device, a first pneumatic knob valve 6 and a second pneumatic knob valve 9 are both in a closed-circuit state, and are in an open-circuit state after the knobs are pressed; the first lever roller valve 7 and the second lever roller valve 8 are both in an open circuit state, and when the air door is opened, the lower bottom surface of the air door is not in contact with the roller any more and is in a closed circuit state. The pneumatic knob valve I6 and the pneumatic knob valve II 9 which are arranged in series can conveniently perform unlocking operation in an emergency state. The lever roller valve I7 and the lever roller valve II 8 which are arranged in parallel can realize that either one of the left air door and the right air door can be opened to lock the other air door. The setting of bolt has guaranteed that a spring cylinder just can accomplish the shutting of two air doors about. When the left air door of the air door 1A is opened, the first lever roller valve 7 is communicated with the first pneumatic knob valve 6 and the second pneumatic knob valve 9 which are in a communication state in series, so that the first pneumatic pipeline 4 is communicated, the first spring air cylinder 10 performs air inlet action, and the piston rod drives the first bolt 11 to be inserted into the lock nose 12 of the air door B to lock the air door 2B. When an emergency occurs, the first pneumatic knob valve 6 or the second pneumatic knob valve 9 is pressed to break the first pneumatic pipeline 4, the first spring cylinder 10 stops supplying air, and the piston rod retracts by the aid of elastic force of the spring to unlock the air door 2 in the channel B. Similarly, when the right air door of the air door 1A is opened, the lever roller valve II 8 is communicated, the spring cylinder I10 is used for air intake, and the air door 2B is locked.
The pneumatic pipeline II 5 is sequentially connected in series with a pneumatic knob valve III 13 arranged between the two air doors, a lever roller valve III 14 arranged on the door frame of the air door B2 in parallel, a pneumatic knob valve IV 16 arranged on the door frame outside the air door A1 and a spring cylinder II 17, and pipelines at two ends of the lever roller valve III 14 are also connected in parallel with a lever roller valve IV 15; the structure of the second pin 18 is the same as that of the first pin 11. And two stop levers of the second bolt 18 are respectively inserted into the A-channel air door locking noses 19 arranged on the left and right air doors. In the device, a third pneumatic knob valve 13 and a fourth pneumatic knob valve 16 are both in a closed state, and are in an open state after the knobs are pressed; and the third lever roller valve 14 and the fourth lever roller valve 15 are in an open circuit state, and when the air door is opened, the lower bottom surface of the air door is not contacted with the roller any more and is in a closed circuit state. When the left air door of the air door 2 in the channel B is opened, the third lever roller valve 14 is connected with the third pneumatic knob valve 13 and the fourth pneumatic knob valve 16 in a channel state in series, so that the second pipeline 5 is connected, the second spring air cylinder 17 performs air inlet action, and the piston rod drives the second bolt 18 to insert into the locking nose 19 of the air door in the channel A to lock the air door 1 in the channel A. When an emergency occurs, the pneumatic rotary knob valve III 13 or the pneumatic rotary knob valve IV 16 is pressed to break the pneumatic pipeline II 5, the spring cylinder II 17 stops supplying air, and the piston rod retracts by the elastic force of the spring to complete the unlocking of the air door 1 in the channel A. Similarly, when the right air door of the air door 2B is opened, the lever roller valve IV 15 is communicated, the spring cylinder II 17 is used for air intake, and the air door 1A is locked.
In the embodiment, the device can only use the pneumatic system to control the locking of the double-channel double-fan air doors, and can conveniently open the two air doors in an emergency state.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (3)
1. A pneumatic locking device for mine air doors comprises an A air door (1), a B air door (2), a first pneumatic pipeline (4) for controlling the locking of the B air door, and a second pneumatic pipeline (5) for controlling the locking of the A air door, wherein the A air door (1) and the B air door (2) respectively comprise a left air door and a right air door, and the pneumatic locking device is characterized in that the first pipeline (4) is sequentially connected with a first pneumatic knob valve (6), a first lever roller valve (7), a second pneumatic knob valve (9) and a first spring cylinder (10) in series, and pipelines at two ends of the first lever roller valve (7) are also connected with the second lever roller valve (8) in parallel; the pipeline II (5) is sequentially connected with a pneumatic knob valve III (13), a lever roller valve III (14), a pneumatic knob valve IV (16) and a spring cylinder II (17) in series, and pipelines at two ends of the lever roller valve III (14) are also connected with a lever roller valve IV (15) in parallel; piston rods of the spring cylinder I (10) and the spring cylinder II (17) are respectively fixedly connected with a bolt I (11) and a bolt II (18); the first bolt (11) is inserted into first lock noses (12) which are respectively arranged on the left air door and the right air door of the air door (2) of the channel B; the second bolt (18) is inserted into a second lock nose (19) which is respectively arranged on the left air door and the right air door of the air door (1) of the channel A;
the first pneumatic knob valve (6) and the third pneumatic knob valve (13) are arranged between the two air doors; the second pneumatic knob valve (9) is arranged on the door frame outside the air door (2) of the channel B; the fourth pneumatic knob valve (16) is arranged on the door frame outside the air door (1) in the A channel;
the lever roller valve I (7) and the lever roller valve II (8) are respectively vertically arranged on the lower door frames of the left and right air doors of the air door A (1) close to the middle door gap, and the rollers contact the lower bottom surface of the air door; the third lever roller valve (14) and the fourth lever roller valve (15) are respectively vertically arranged on the lower door frames of the left and right air doors of the air door (2) in the B channel, which are close to the middle door gap, and the rollers contact the lower bottom surface of the air door;
the spring cylinder I (10) and the spring cylinder II (17) are respectively arranged on the upper door frame between the left air door and the right air door of the air door A (1) and the air door B (2).
2. The pneumatic mine damper latching unit as claimed in claim 1, wherein said first latch (11) and said second latch (18) comprise a connecting rod (1101) connecting said piston rod at the middle portion thereof, and a first catch lever (1102) and a second catch lever (1103) fixedly disposed at both ends of said connecting rod; the first stop lever (1102) and the second stop lever (1103) are inserted into the lock nose.
3. The pneumatic mine damper locking device according to claim 1, wherein the first pneumatic line (4) and the second pneumatic line (5) are branched off from the main pneumatic line (20) via the filter (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811447192.5A CN109577765B (en) | 2018-11-29 | 2018-11-29 | Pneumatic locking device for mine air door |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811447192.5A CN109577765B (en) | 2018-11-29 | 2018-11-29 | Pneumatic locking device for mine air door |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109577765A CN109577765A (en) | 2019-04-05 |
| CN109577765B true CN109577765B (en) | 2020-07-17 |
Family
ID=65923928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811447192.5A Active CN109577765B (en) | 2018-11-29 | 2018-11-29 | Pneumatic locking device for mine air door |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109577765B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578545B (en) * | 2019-08-25 | 2021-04-02 | 滁州方大矿业发展有限公司 | Air door control valve convenient to manual regulation |
| CN110513136A (en) * | 2019-08-25 | 2019-11-29 | 滁州方大矿业发展有限公司 | A kind of pure air control unit of coal mine air door automatic blocking |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2291668A (en) * | 1991-07-19 | 1996-01-31 | Kennedy Jack Metal Prod | Power mine door system |
| US6955594B2 (en) * | 2003-06-27 | 2005-10-18 | Kennedy William R | Mine door system including an air pressure relief door |
| CN2866823Y (en) * | 2006-01-20 | 2007-02-07 | 卢玉彬 | Pneumatic locking non-pressure air door |
| CN201148877Y (en) * | 2008-01-25 | 2008-11-12 | 张子鹏 | Pneumatic power interlock air door |
| CN101871358A (en) * | 2009-04-22 | 2010-10-27 | 苗占有 | Novel mine air door pneumatic locking device |
| CN102135007A (en) * | 2011-02-23 | 2011-07-27 | 焦作煤业（集团）新乡能源有限公司 | Pneumatically-controlled locking device for mine air door |
| CN103397896A (en) * | 2013-08-12 | 2013-11-20 | 山西焦煤集团有限责任公司 | Air type lockout biparting air door |
| CN205778982U (en) * | 2016-05-30 | 2016-12-07 | 济宁东达机电有限责任公司 | Full pneumatic control air door device |
| CN206681774U (en) * | 2017-03-14 | 2017-11-28 | 长安大学 | A kind of underground air door automatic control system |
| CN207974846U (en) * | 2018-03-28 | 2018-10-16 | 沈湘阳 | A kind of pneumatic automatic throttle device of underground coal mine |
-
2018
- 2018-11-29 CN CN201811447192.5A patent/CN109577765B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2291668A (en) * | 1991-07-19 | 1996-01-31 | Kennedy Jack Metal Prod | Power mine door system |
| US6955594B2 (en) * | 2003-06-27 | 2005-10-18 | Kennedy William R | Mine door system including an air pressure relief door |
| CN2866823Y (en) * | 2006-01-20 | 2007-02-07 | 卢玉彬 | Pneumatic locking non-pressure air door |
| CN201148877Y (en) * | 2008-01-25 | 2008-11-12 | 张子鹏 | Pneumatic power interlock air door |
| CN101871358A (en) * | 2009-04-22 | 2010-10-27 | 苗占有 | Novel mine air door pneumatic locking device |
| CN102135007A (en) * | 2011-02-23 | 2011-07-27 | 焦作煤业（集团）新乡能源有限公司 | Pneumatically-controlled locking device for mine air door |
| CN103397896A (en) * | 2013-08-12 | 2013-11-20 | 山西焦煤集团有限责任公司 | Air type lockout biparting air door |
| CN205778982U (en) * | 2016-05-30 | 2016-12-07 | 济宁东达机电有限责任公司 | Full pneumatic control air door device |
| CN206681774U (en) * | 2017-03-14 | 2017-11-28 | 长安大学 | A kind of underground air door automatic control system |
| CN207974846U (en) * | 2018-03-28 | 2018-10-16 | 沈湘阳 | A kind of pneumatic automatic throttle device of underground coal mine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109577765A (en) | 2019-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109577765B (en) | Pneumatic locking device for mine air door | |
| CN107152210B (en) | A kind of automatic closing system for fire window | |
| US10662740B2 (en) | Valve apparatus | |
| CN101871358A (en) | Novel mine air door pneumatic locking device | |
| CN205577753U (en) | A manhole door for desulfurizing tower | |
| CN111520177A (en) | HA mine air door pneumatic control system | |
| CN104827870A (en) | Safety bus capable of being laterally opened | |
| CN205918975U (en) | Novel pneumatic blast gate remote control device | |
| CN207527077U (en) | A kind of valve block structure | |
| CN205422255U (en) | Locomotive linkage pneumatic door lock | |
| CN210565410U (en) | Switch control gas circuit system for box cover | |
| CN212508396U (en) | HA mine air door pneumatic control system | |
| CN113236847A (en) | Double-acting valve control system for controlling locking of valve | |
| CN205823316U (en) | Mine air door interlock | |
| CN208236182U (en) | A kind of improved subway people's air defense partition door jack safety device | |
| CN208310832U (en) | A kind of pneumatic air door clamp plate type throttle locking device | |
| CN208089931U (en) | A kind of safety interlock device of quick actuating closure device | |
| CN106014469A (en) | Mining air door interlocking device | |
| CN220134007U (en) | Mining pneumatic air door control box | |
| CN205951988U (en) | Colliery inclined drifts interlock | |
| CN204511492U (en) | A kind of coal mine down-hole tunnel pneumatic throttle interlock | |
| CN216768525U (en) | Device for electrically controlling opening and closing of valve and maintaining valve position | |
| CN103397896A (en) | Air type lockout biparting air door | |
| CN208006255U (en) | Automatic die-locking device and its control system | |
| CN111927551B (en) | Gas pretreatment device applied to monitoring of underground laser beam tube of coal mine |
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 |