CN217909748U - Outer exhaust air treatment device of underground mine return air shaft - Google Patents
Outer exhaust air treatment device of underground mine return air shaft Download PDFInfo
- Publication number
- CN217909748U CN217909748U CN202221720505.1U CN202221720505U CN217909748U CN 217909748 U CN217909748 U CN 217909748U CN 202221720505 U CN202221720505 U CN 202221720505U CN 217909748 U CN217909748 U CN 217909748U
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- Prior art keywords
- fixedly connected
- dust
- air
- dust removal
- removal case
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- 239000000428 dust Substances 0.000 claims abstract description 101
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims 1
- 231100000719 pollutant Toxicity 0.000 claims 1
- 239000002912 waste gas Substances 0.000 abstract description 37
- 238000007789 sealing Methods 0.000 abstract description 9
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 10
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- 238000002156 mixing Methods 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 210000002445 nipple Anatomy 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000883990 Flabellum Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses an outer dirty wind of underground mine return air shaft administers device, including supporting platform, supporting platform's upper end front side fixedly connected with dust removal case, supporting platform's upper end rear side fixedly connected with retort, the inside of dust removal case is provided with dust collecting component, dust collecting component include with dust removal incasement portion upper end fixed connection's fixed plate, the front side lower extreme fixedly connected with vibrating motor of fixed plate. According to the invention, the dust collection assembly adopts an electrostatic dust collection principle to collect dust, the contact area between the V-shaped plate and the waste gas can be increased by the V-shaped plate and the plate electrode, so that dust is captured more easily, the dust collection efficiency is improved, the vibration motor can drive the V-shaped plate to vibrate, so that the dust on the plate electrode can fall into the dust storage shell through the opening, the dust storage shell can lift along with the sealing plate, and the dust storage shell is connected with the sealing plate through magnetic attraction, so that a worker can conveniently clean the dust in the dust storage shell.
Description
Technical Field
The utility model relates to a mine equipment technical field especially relates to an outer exhaust air treatment device of underground mine return air shaft.
Background
The return air shaft of underground mining mine, the main function is with high temperature, high humidity, dusty waste gas discharge earth's surface in the pit, and the waste gas of discharging outward all contains toxic composition (this toxic composition is mainly hydrogen sulfide), so not only cause the influence to the environment, can cause the influence to the health of people moreover.
Chinese patent with patent publication number CN114534417a discloses an external waste air treatment device of underground mine return air shaft, including the air inlet case, the air-out pipeline of air inlet case stretches into the inner chamber of the jar body, the internal coaxial first centrifuge bowl that is equipped with of jar, actuating mechanism is used for driving first centrifuge bowl to rotate, the upper end coaxial of first centrifuge bowl is equipped with the air inlet nipple joint, the air-out pipeline stretches into in the air inlet nipple joint, the inner wall of air inlet nipple joint is equipped with the blade, the passageway in the first pivot loops through rotary joint and first pump connection sedimentation tank, and the mounting hole that is used for installing atomizing nozzle is offered to first pivot axial, the lateral wall of the jar body is including filling the annular netted frame that has the filler ball, and the upper end of the jar body is equipped with the first pipeline with the upper end intercommunication of netted frame, first pipeline passes through the second pump connection sedimentation tank. Can neutralize the toxic component among the processing waste gas, realize removing dust to waste gas and filter to and effectively cool down to waste gas, thereby reduce waste gas to environment and human adverse effect.
Above-mentioned patent, when removing dust to waste gas, waste gas is prior to the impeller contact, can make the dust in the waste gas adhere to on the impeller, influences the operation of impeller, and the dust collection efficiency of the dust removal structure of adoption is relatively poor, to the collection that the dust can not be convenient, and when the mode that adopts the spraying got rid of the hydrogen sulfide in to waste gas, the contact time of spraying and waste gas is shorter, and hydrogen sulfide gets rid of efficiency relatively poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing an underground mine return air shaft external exhaust air treatment device.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides an outer dirty wind treatment device of arranging of underground mine return air shaft, includes supporting platform, supporting platform's upper end front side fixedly connected with dust removal case, supporting platform's upper end rear side fixedly connected with retort, the inside of dust removal case is provided with collection dirt subassembly, collection dirt subassembly include with dust removal incasement portion upper end fixed connection's fixed plate, the front side lower extreme fixedly connected with vibrating motor of fixed plate, vibrating motor's front end fixedly connected with connecting rod, the front end fixedly connected with V template of connecting rod, equal fixedly connected with rubber slab between the upper and lower end of V template and the dust removal case, the equal a plurality of plate electrodes of fixedly connected with in front end both sides of V template, the inside position fixedly connected with electrode bar that is located V template front end of dust removal case, the rear end intermediate position fixedly connected with first outlet duct of dust removal case, the rear end fixedly connected with first outlet duct of first outlet duct, the output fixedly connected with reducer pipe of first air-blower, the rear end fixedly connected with second intake pipe, the one end fixedly connected with hollow disc of reducer pipe one end through the retort, the hollow disc of fixed connection with the upper end fixedly connected with of a plurality of air-blower, the intermediate position fixedly connected with support plate of the servo motor lower extreme of the backup pad, the servo motor lower extreme of the fixed connection with of the pivot of the servo motor.
Furthermore, the middle position of the front end of the dust removal box is fixedly connected with an air inlet hopper, and the front end of the air inlet hopper is fixedly connected with a first air inlet pipe.
Furthermore, the inside of supporting platform is located the first servo motor of position fixedly connected with in the middle of dust removal case below front side, first servo motor's output fixedly connected with screw rod, a plurality of slide bars of fixedly connected with between the lower extreme rear side of dust removal case and the supporting platform.
Further, the opening has been seted up to the lower extreme of dust removal case, the below of dust removal case is provided with the closing plate, the upper end magnetism of closing plate is inhaled and is connected with the storage dirt casing, the first connecting block of front end intermediate position fixedly connected with of closing plate, first connecting block and screw rod threaded connection, the rear end fixedly connected with of closing plate has a plurality of second connecting blocks, the second connecting block respectively with correspond slide bar sliding connection.
Furthermore, the inside position fixedly connected with support ring that is located the backup pad upper end of retort, the upper end fixedly connected with connecting cover of support ring, the upper end fixedly connected with second outlet duct of connecting cover.
Furthermore, the upper end fixedly connected with second air-blower that the upper end of second outlet duct runs through the retort, the crisscross fixedly connected with a plurality of drying plates of inner wall of connecting cover.
The utility model has the advantages that:
1. the utility model discloses when using, this external blowdown wind treatment device of underground mine return air shaft, first air-blower sets up the rear end at first outlet duct, first air-blower passes through first intake pipe with waste gas, the suction of air inlet fill is to the dust removal incasement removes dust, after removing dust, pass through first air-blower, reducer pipe and second intake pipe enter into the retort, can avoid the dust in the waste gas to adhere to on the flabellum of first air-blower, influence the operation of first air-blower, the dust collecting component who sets up adopts the principle of electrostatic precipitator to collect dust, the V template and the plate electrode that set up can increase the area of contact with waste gas, make the dust more easily catch, improve dust collection efficiency, and the vibrating motor who sets up can drive the V template vibration, thereby can make the dust on the plate electrode drop in the dust storage casing through the opening, the dust storage casing can go up and down along with the closing plate, and the dust storage casing is connected with the closing plate magnetism, thereby can make things convenient for the staff to clear up the dust in the dust storage casing;
2. the utility model discloses when using, this outer dirty wind treatment device of arranging of underground mine return air shaft, waste gas through setting up is through removing dust the back, in first intake pipe enters into hollow dish, spout through a plurality of shower nozzles again, fill neutralization liquid in the retort, waste gas contacts with neutralization liquid after the shower nozzle blowout, and the second servo motor that sets up can drive the stirring fan blade rotation of pivot lower extreme, the centering stirs with liquid and waste gas and mixes, make waste gas and neutralization liquid fully contact, thereby can improve hydrogen sulfide's efficiency of getting rid of.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the lifting and lowering of the sealing plate of the present invention;
FIG. 3 is a schematic view of the installation structure of the dust collecting assembly of the present invention;
fig. 4 is a front view of the dust collecting assembly of the present invention;
fig. 5 is a rear view of the dust collecting assembly of the present invention;
FIG. 6 is a schematic view of the internal structure of the reaction tank of the present invention;
fig. 7 is a schematic view of a second servo motor mounting structure of the present invention;
fig. 8 is a schematic view of the internal structure of the connection cover of the present invention.
Illustration of the drawings:
1. a support platform; 2. a dust removal box; 3. a first servo motor; 4. a screw; 5. a slide bar; 6. sealing plates; 7. an air inlet hopper; 8. a first intake pipe; 9. a first air outlet pipe; 10. a first blower; 11. a reducer pipe; 12. a second intake pipe; 13. a reaction tank; 14. a second outlet pipe; 15. a second blower; 16. a dust storage housing; 17. a first connection block; 18. a second connecting block; 19. a dust collection assembly; 20. an opening; 21. a V-shaped plate; 22. an electrode plate; 23. a rubber plate; 24. An electrode rod; 25. a fixing plate; 26. a vibration motor; 27. a connecting rod; 28. a support plate; 29. a rotating shaft; 30. stirring fan blades; 31. a hollow disc; 32. a spray head; 33. a support ring; 34. a connecting cover; 35. a second servo motor; 36. the plate was dried.
Detailed Description
As shown in fig. 1-8, relates to an external exhaust air treatment device of an underground mine air return shaft, which comprises a supporting platform 1, a dust removal box 2 is fixedly connected to the front side of the upper end of the supporting platform 1, an air inlet hopper 7 is fixedly connected to the middle position of the front end of the dust removal box 2, a first air inlet pipe 8 is fixedly connected to the front end of the air inlet hopper 7, a dust collection assembly 19 is arranged inside the dust removal box 2, the dust collection assembly 19 comprises a fixing plate 25 fixedly connected to the upper end inside the dust removal box 2, a vibration motor 26 is fixedly connected to the lower end of the front side of the fixing plate 25, a connecting rod 27 is fixedly connected to the front end of the vibration motor 26, the vibration motor 26 drives a V-shaped plate 21 at the front end of the connecting rod 27 to vibrate, so as to drive a plurality of electrode plates 22 to vibrate, dust on the electrode plates 22 is shaken off, a V-shaped plate 21 is fixedly connected to the front end of the connecting rod 27, rubber plates 23 are fixedly connected between the upper and lower ends of the V-shaped plate 21 and the dust removal box 2, the arranged rubber plate 23 plays a role in connecting the V-shaped plate 21 with the dust removal box 2, so that waste gas is prevented from passing through a gap between the upper end and the lower end of the V-shaped plate 21 and the dust removal box 2, a plurality of electrode plates 22 are fixedly connected to two sides of the front end of the V-shaped plate 21, an electrode bar 24 is fixedly connected to the position, which is located at the front end of the V-shaped plate 21, of the dust removal box 2, after the electrode bar 24 and the electrode plates 22 are electrified, electrostatic field ionized air is generated between the electrode bar 24 and the electrode plates, air molecules are ionized into positive ions and electrons, the electrons run towards the positive electrode and encounter dust, dust particles are adsorbed onto the electrode plates 22 with negative electricity and collected, the arranged V-shaped plate 21 can separate the waste gas entering the dust removal box 2, the waste gas flows along two sides of the V-shaped plate 21, the electrode plates 22 arranged on two sides of the V-shaped plate 21 are gradually increased in length from front to back, make waste gas can progressively contact with electrode board 22 for dust in the waste gas can with adsorb on a plurality of electrode boards 22, the rear end intermediate position fixedly connected with first outlet duct 9 of dust removal case 2, the rear end fixedly connected with first air-blower 10 of first outlet duct 9.
As shown in fig. 1-3, the inside of the supporting platform 1 is located at the middle position of the front side below the dust removing box 2, the output end of the first servo motor 3 is fixedly connected with the screw rod 4, a plurality of slide rods 5 are fixedly connected between the rear side of the lower end of the dust removing box 2 and the supporting platform 1, an opening 20 is formed in the lower end of the dust removing box 2, a sealing plate 6 is arranged below the dust removing box 2, the upper end of the sealing plate 6 is magnetically connected with a dust storage shell 16, the front end middle position of the sealing plate 6 is fixedly connected with a first connecting block 17, the first connecting block 17 is in threaded connection with the screw rod 4, the rear end of the sealing plate 6 is fixedly connected with a plurality of second connecting blocks 18, the second connecting blocks 18 are respectively in sliding connection with the corresponding slide rods 5, the servo motor is started to drive the screw rod 4 to rotate reversely, so that the sealing plate 6 fixed with the first connecting block 17 can be driven to descend along the slide rods 5 through the second connecting blocks 18, and the dust storage shell 16 can be driven to descend.
As shown in fig. 1-7, a reaction tank 13 is fixedly connected to the rear side of the upper end of a supporting platform 1, a neutralizing solution is stored in the reaction tank 13, the neutralizing solution is 15-20% diethanolamine aqueous solution, the diethanolamine aqueous solution can absorb hydrogen sulfide to form a rich solution, the rich solution is heated to 100-130 ℃, the hydrogen sulfide can be analyzed, high-concentration hydrogen sulfide can be obtained through condensation, sulfur can be prepared, the solution is cooled and continuously used through a heat exchanger after being regenerated, a reducing pipe 11 is fixedly connected to the output end of a first blower 10, a second air inlet pipe 12 is fixedly connected to the rear end of the reducing pipe 11, one end, far away from the reducing pipe 11, of the second air inlet pipe 12 penetrates through a hollow disc 31 fixedly connected to the side wall of the reaction tank 13, a plurality of spray nozzles 32 are fixedly connected to the upper end of the hollow disc 31, a supporting plate 28 is fixedly connected to the middle position inside the reaction tank 13, a second servo motor 35 is fixedly connected to the middle position of the upper end of the supporting plate 28, a rotating shaft 29 is fixedly connected to the output end of the supporting plate 28, a plurality of stirring fan blades 30 is fixedly connected to the lower end of the rotating shaft 29, the waste gas after dust removal enters the air outlet pipe 9 and enters the second servo motor 11, the air inlet pipe 12, the hydrogen sulfide liquid and the mixing tank 13, and the mixing fan blades 13, and the waste gas are driven by the mixing liquid, and the mixing fan 13, and the hydrogen sulfide liquid, and the mixing fan 13, and the mixing fan blades.
As shown in fig. 6-7, a support ring 33 is fixedly connected to a position inside the reaction tank 13, which is located at the upper end of the support plate 28, a connection cover 34 is fixedly connected to the upper end of the support ring 33, a second outlet pipe 14 is fixedly connected to the upper end of the connection cover 34, a second air blower 15 is fixedly connected to the upper end of the second outlet pipe 14, a plurality of drying plates 36 are fixedly connected to the inner wall of the connection cover 34 in a staggered manner, the set second air blower 15 can pump the processed waste gas into the connection cover 34, the drying plates 36 arranged in the connection cover 34 in a staggered manner can dehumidify the waste gas, the waste gas is discharged through the second outlet pipe 14, and after being discharged, moisture in the waste gas in an environment with a low temperature can be prevented from being frozen when passing through the second outlet pipe 14 and the second air blower 15, thereby affecting the operation of the second air blower 15 and the exhaust of the second outlet pipe 14.
The working principle is as follows: when using, be connected to the inside of return air shaft with first intake pipe 8, start and to pass through first intake pipe 8 with waste gas, air inlet hopper 7 suction is to the dust removal case 2 in, after leading to the circular telegram of electrode bar 24 and electrode plate 22, produce electrostatic field ionized air between, air molecule is ionized for positive ion and electron, the electron is rushed to anodal in-process and is met the dust, make dust particle area negative electricity adsorb and be collected on electrode plate 22, waste gas after the dust removal passes through first outlet duct 9, reducing pipe 11 and second intake pipe 12 enter into the air dish, spout in a plurality of shower nozzles 32, enter into the neutralization liquid in retort 13, the second servo motor 35 that sets up starts the stirring fan blade 30 that drives pivot 29 lower extreme and rotates and stir the neutralization liquid and waste gas and mix, make hydrogen sulfide in the waste gas neutralized, the second air blower 15 that sets up can drive the waste gas suction after handling in connecting cover 34, the drying plate 36 that sets up in connecting cover 34 can dehumidify waste gas, the waste gas is handled through the second processing of the second air blower 14, the vibration motor drives the vibration motor and drives the dust storage shell 16, thereby can drive the dust storage casing 16 that drives the vibration motor 16 to drop, thereby the dust collection casing 16, the vibration motor drives the dust storage casing 16 that drives the dust storage casing that starts to drop.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. The utility model provides an outer exhaust air treatment device of underground mine return air shaft, includes supporting platform (1), its characterized in that: upper end front side fixedly connected with dust removal case (2) of supporting platform (1), the upper end rear side fixedly connected with retort (13) of supporting platform (1), the inside of dust removal case (2) is provided with dust collecting component (19), dust collecting component (19) include with dust removal case (2) inside upper end fixed connection's fixed plate (25), front side lower extreme fixedly connected with vibrating motor (26) of fixed plate (25), the front end fixedly connected with connecting rod (27) of vibrating motor (26), the front end fixedly connected with V template (21) of connecting rod (27), equal fixedly connected with rubber slab (23) between the last lower extreme of V template (21) and dust removal case (2), the equal fixedly connected with a plurality of electrode plate (22) in front end both sides of V template (21), the inside of dust removal case (2) is located the position fixedly connected with electrode bar (24) of V template (21) front end, the rear end intermediate position fixedly connected with of dust removal case (2) is connected with first outlet duct (9), the rear end fixedly connected with first outlet duct (10) of first air-blower fan (9), the rear end fixedly connected with first reducer pipe (11) is located the reducer pipe (11) of first outlet duct (11), the second reducer pipe (11) is run through the reaction pipe (11), the second reducer pipe (11) is kept away from the rear end fixedly connected with of air-reducer pipe (11), the air-reducer pipe (11) of air-outlet duct (11), the air-outlet duct (12) of air-outlet duct (11), the second air-outlet duct (11) is located the rear end fixedly connected with (13) The lateral wall fixedly connected with hollow plate (31), a plurality of shower nozzles of upper end fixedly connected with (32) of hollow plate (31), inside intermediate position fixedly connected with backup pad (28) of retort (13), the upper end intermediate position fixedly connected with second servo motor (35) of backup pad (28), backup pad (28) fixedly connected with pivot (29) is run through to the output of second servo motor (35), a plurality of stirring fan blade of lower extreme fixedly connected with (30) of pivot (29).
2. The external discharge pollutant air treatment device of the underground mine return air shaft according to claim 1, is characterized in that: the dust removal case is characterized in that an air inlet hopper (7) is fixedly connected to the middle position of the front end of the dust removal case (2), and a first air inlet pipe (8) is fixedly connected to the front end of the air inlet hopper (7).
3. The device of claim 1, wherein the device is a device for treating the exhaust air from the return air shaft of the underground mine: the utility model discloses a dust removal box, including supporting platform (1), the inside of supporting platform (1) is located the first servo motor (3) of position fixedly connected with in the middle of dust removal case (2) below front side, the output end fixedly connected with screw rod (4) of first servo motor (3), a plurality of slide bars (5) of fixedly connected with between the lower extreme rear side of dust removal case (2) and supporting platform (1).
4. The exterior discharge air treatment device for the return air shaft of the underground mine according to claim 3, characterized in that: opening (20) have been seted up to the lower extreme of dust removal case (2), the below of dust removal case (2) is provided with closing plate (6), the upper end magnetism of closing plate (6) is inhaled and is connected with storage dirt casing (16), the first connecting block (17) of front end intermediate position fixedly connected with of closing plate (6), first connecting block (17) and screw rod (4) threaded connection, the rear end fixedly connected with of closing plate (6) a plurality of second connecting blocks (18), second connecting block (18) respectively with correspond slide bar (5) sliding connection.
5. The device of claim 1, wherein the device is a device for treating the exhaust air from the return air shaft of the underground mine: the position fixedly connected with support ring (33) that the inside of retort (13) is located backup pad (28) upper end, the upper end fixedly connected with connecting cover (34) of support ring (33), the upper end fixedly connected with second outlet duct (14) of connecting cover (34).
6. The exterior discharge air treatment device for the return air shaft of the underground mine according to claim 5, characterized in that: the upper end fixedly connected with second air-blower (15) of retort (13) is run through to the upper end of second outlet duct (14), the crisscross fixedly connected with a plurality of drying plates (36) of inner wall of connecting cover (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221720505.1U CN217909748U (en) | 2022-06-30 | 2022-06-30 | Outer exhaust air treatment device of underground mine return air shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221720505.1U CN217909748U (en) | 2022-06-30 | 2022-06-30 | Outer exhaust air treatment device of underground mine return air shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217909748U true CN217909748U (en) | 2022-11-29 |
Family
ID=84186398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221720505.1U Expired - Fee Related CN217909748U (en) | 2022-06-30 | 2022-06-30 | Outer exhaust air treatment device of underground mine return air shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217909748U (en) |
-
2022
- 2022-06-30 CN CN202221720505.1U patent/CN217909748U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20221129 |
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| CF01 | Termination of patent right due to non-payment of annual fee |