CN108798744B - Energy-conserving ventilation system of colliery safety - Google Patents
Energy-conserving ventilation system of colliery safety Download PDFInfo
- Publication number
- CN108798744B CN108798744B CN201810214395.3A CN201810214395A CN108798744B CN 108798744 B CN108798744 B CN 108798744B CN 201810214395 A CN201810214395 A CN 201810214395A CN 108798744 B CN108798744 B CN 108798744B
- Authority
- CN
- China
- Prior art keywords
- air
- gas
- exhaust
- mine
- ventilation system
- 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
- 238000009423 ventilation Methods 0.000 title claims abstract description 23
- 239000000725 suspension Substances 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000004744 fabric Substances 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 3
- 238000004880 explosion Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 58
- 238000007599 discharging Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
- E21F1/04—Air ducts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/02—Suspension devices for tubes or the like, e.g. for ventilating ducts
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ventilation (AREA)
Abstract
The invention relates to the technical field of mine ventilation. Aim at provides the energy-conserving ventilation system of colliery safety that can very big reduction safety risk. The technical scheme adopted by the invention is as follows: a coal mine safety energy-saving ventilation system comprises an exhaust pipeline arranged on the inner top surface of a mine and an air inlet pipeline arranged on the inner top surface of the mine, wherein a plurality of air outlet shutters are arranged on the air inlet pipeline; a plurality of air exhaust sections are uniformly arranged on the air exhaust pipeline; the two sides of the air exhaust section are provided with air exhaust shutters, the air exhaust section on the inner side of the air exhaust shutters is internally provided with a vertical light thin plate parallel to the side wall of the air exhaust section, the top of the light thin plate is connected with the lower end of a sliding rod, the upper end of the sliding rod penetrates through a guide hole in the top surface of the air exhaust section and is connected with a suspension air bag, and gas concentration sensitive gas is filled in the suspension air bag. The invention abandons the traditional electrical appliance in the ventilation system, adopts pure mechanical control to the air port in the well, can reduce the risk of gas explosion, and has extremely high safety and energy saving performance.
Description
Technical Field
The invention relates to the technical field of mine ventilation, in particular to a coal mine safety energy-saving ventilation system.
Background
In the coal mining process, due to the mine construction environment, the shortage of underground oxygen is shown firstly, so that the long-term underground construction of workers is not facilitated; secondly, gas can be continuously generated in the underground construction process, if the gas is not removed in time, the health of workers can be necessarily influenced, even gas explosion accidents can be caused in serious conditions, and the life safety of the workers is threatened. Therefore, the downhole pipe ventilation system is produced at the same time.
The existing pipeline ventilation system mainly comprises an air inlet pipeline and an air outlet pipeline which are laid in a mine, wherein a plurality of air inlets and air outlets are arranged on the air inlet pipeline and the air outlet pipeline, electric control air doors are arranged at the air inlets and the air outlets, and the air inlet pipeline and the air outlet pipeline are connected with an exhaust fan and a blower outside the mine. Clean air outside the well is sent into the well by the air feeder and the air inlet pipeline, and foul air in the well is pumped out of the well by the exhaust fan and the exhaust pipeline, so that ventilation inside and outside the well is realized, and the safe production is ensured to be carried out smoothly. However, the existing pipe ventilation system still has certain defects, because the air quality at each position in the well is different, the area in the well is large, the terrain is complex, and in order to ensure that the exhaust fan has enough pumping pressure, a plurality of gas concentration sensors are correspondingly arranged in the area where the exhaust outlet in the well is located in the prior art so as to detect the gas concentration in the well. When the measured gas concentration is too high, the corresponding electric control air door is opened, otherwise, the electric control air door is closed, and therefore the effective utilization of the exhaust fan is achieved. However, it is known that a coal mine is an inflammable and explosive high-risk area, and the addition of electrical appliances such as an electrical control air door and a gas concentration sensor inevitably increases the underground explosion risk, so that a huge hidden danger is buried for safety production.
Disclosure of Invention
The invention aims to provide a coal mine safety energy-saving ventilation system capable of greatly reducing safety risks.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a coal mine safety energy-saving ventilation system comprises an exhaust pipeline arranged on the inner top surface of a mine and an air inlet pipeline arranged on the inner top surface of the mine, wherein a plurality of air outlet shutters are arranged on the air inlet pipeline; the exhaust pipeline is uniformly provided with a plurality of exhaust sections, the exhaust sections are in a square tube shape, and two ends of the exhaust sections are connected with the main body part of the exhaust pipeline through a hemispherical and square pipe; the two sides of the air exhaust section are provided with air exhaust shutters, the air exhaust section on the inner side of the air exhaust shutters is internally provided with a vertical light thin plate parallel to the side wall of the air exhaust section, the top of the light thin plate is connected with the lower end of a sliding rod, the upper end of the sliding rod penetrates through a guide hole in the top surface of the air exhaust section and is connected with a suspension air bag, and the suspension air bag is filled with gas concentration sensitive gas.
The top of air-supply line still evenly is provided with a plurality of air inlet side pipes, air inlet side pipe outer end is provided with the cloth wind head of lid form, cloth wind head and air-supply line side pipe threaded connection, evenly set up multichannel annular gap on the lateral wall of cloth wind head, multichannel annular gap constitutes the air-out tripe.
Preferably, the gas concentration sensitive gas is a mixed gas of gas and air.
Preferably, the blades of the air exhaust louver are inclined upwards and obliquely.
Preferably, the top surface of the air exhaust section is provided with a guide short pipe at a position corresponding to the guide hole, and the sliding rod is matched with the guide short pipe and is positioned in the guide short pipe.
Preferably, the exhaust duct is laid on a mounting frame formed by U-shaped clamps, and two ends of each U-shaped clamp are anchored in the rock wall of the top surface of the mine.
Preferably, the position of the air inlet side pipe and the air exhaust section are mutually staggered, and the distance in the horizontal direction is at least 5 meters.
Preferably, the annular gap is inclined downwards from inside to outside.
Preferably, the bottom of the air inlet pipeline is also provided with a water collecting tank, and the side wall of the water collecting tank is provided with a plurality of water seepage holes; the lower part of the air inlet pipeline is buried underground.
The invention has the beneficial effects that the traditional electrical appliance is abandoned in the ventilation system, the air port in the well is controlled in a pure mechanical mode, the risk of gas explosion can be reduced, and the invention has extremely high safety and energy saving performance. Specifically, in the using process of the invention, the foul air containing gas in the mine is exhausted through the exhaust pipeline, and the external fresh air is supplemented into the mine through the air inlet pipeline. In the process of discharging, air sequentially enters the air discharging section and the air discharging pipeline through the air discharging shutter.
The suspension air bag is filled with gas concentration sensitive gas, when the gas concentration in the mine is lower, the gas density at the top in the mine is equivalent to that of air and is greater than that of the gas concentration sensitive gas, at the moment, the suspension air bag drives the light sheet to ascend, and the light sheet forms a certain barrier to the air exhaust shutter; when the gas concentration in the mine is higher, the gas is gathered at the top of the mine, the gas density at the top of the mine is equivalent to the density of the gas sensitive to the gas concentration, and at the moment, the light thin plate slides downwards under the influence of the self gravity of the suspension air bag, the sliding rod and the light thin plate and is separated from the area of the air exhaust louver, so that the gas circulation at the air exhaust louver is not influenced. Therefore, the invention can automatically carry out self-adaptive adjustment on the air exhaust shutter of each air exhaust section according to the air quality condition of each position in the mine, greatly improves the utilization rate of the exhaust fan, does not need to use electric equipment such as a gas concentration sensor, an electric air door and the like, and has more energy saving and lower risk.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the exhaust section;
FIG. 3 is a view from direction A-A of the structure shown in FIG. 2;
FIG. 4 is a schematic view of the structure shown in FIG. 3 in a use state;
FIG. 5 is a schematic view showing the installation of the air inlet side duct;
FIG. 6 is a schematic view of the internal structure of the air outlet head;
fig. 7 is a schematic view of the structure of the water collection tank.
Detailed Description
The coal mine safety energy-saving ventilation system shown in the combined drawings of fig. 1-7 comprises an exhaust duct 2 arranged on the inner top surface of a mine 1 and an air inlet duct 3 arranged on the inner bottom surface of the mine 1, wherein the exhaust duct 2 is generally laid on a mounting frame formed by a U-shaped clamp 12, and two ends of the U-shaped clamp 12 are anchored in a rock wall on the top surface of the mine 1; the air inlet duct 3 is typically laid directly on the ground. The exhaust pipeline 2 is used for discharging dirty air in the mine, the air inlet pipeline 3 is used for supplementing fresh air into the mine 1, the air inlet pipeline 3 is provided with a plurality of air outlet shutters 4, and the fresh air is supplemented into the mine 1 through the air outlet shutters 4.
The exhaust duct 2 is uniformly provided with a plurality of exhaust sections 5, and the dirty air enters the main body part of the exhaust duct 2 through the exhaust sections 5 and is extracted from the main body part of the exhaust duct 2. As shown in fig. 2-4, the exhaust section 5 is in a square tube shape, and two ends of the exhaust section are connected with the main body of the exhaust duct 2 through a pipe 6. The two sides of the air exhaust section 5 are provided with air exhaust shutters 7, the air exhaust section 5 on the inner side of the air exhaust shutters 7 is internally provided with a vertical light thin plate 8 which is parallel to the side wall of the air exhaust section 5, the light thin plate 8 is light, the top of the light thin plate 8 is connected with the lower end of a sliding rod 9, and the upper end of the sliding rod 9 penetrates through a guide hole on the top surface of the air exhaust section 5 and is connected with a suspension air bag 10. In order to improve the stability of the sliding rod 9 during sliding, it is better to arrange a guide short pipe 11 on the top surface of the exhaust section 5 corresponding to the guide hole, and the sliding rod 9 is matched with the guide short pipe 11 and is positioned in the guide short pipe 11.
The suspension air bag 10 is filled with gas concentration sensitive gas, and the gas concentration sensitive gas is gas with the density equivalent to the density of mixed gas of gas and air when the gas concentration reaches an alarm value. The gas concentration sensitive gas is a mixed gas formed by mixing gas and air.
In the using process of the invention, the foul air containing gas in the mine 1 is exhausted through the exhaust pipeline 2, and the external fresh air is supplemented into the mine 1 through the air inlet pipeline 3. Because the gas density is lower, the gas is easy to gather at the top of the mine 1, in order to enable the gas to pass through the air exhaust shutter 7 more smoothly, the better way is that the blades of the air exhaust shutter 7 incline upwards and outwards.
In the process of discharging, air enters the air discharging section 5 and the air discharging pipeline 2 in sequence through the air discharging shutter 7. The suspension air bag 10 is filled with gas concentration sensitive gas, when the gas concentration in the mine 1 is low, as shown in fig. 4, the gas density at the top in the mine 1 is equal to that of air and is greater than that of the gas concentration sensitive gas, at the moment, the suspension air bag 10 drives the light thin plate 8 to ascend, and the light thin plate 8 forms certain blocking to the air exhaust louver 7.
When the gas concentration in the mine 1 is high, the gas is gathered at the top of the mine 1, the gas density at the top of the mine 1 is equivalent to the density of the gas sensitive to the gas concentration, as shown in fig. 3, at this time, the light thin plate 8 slides downwards under the influence of the gravity of the suspension air bag 10, the sliding rod 9 and the light thin plate 8, and is separated from the area of the air exhaust louver 7, so that the gas circulation at the air exhaust louver 7 is not influenced. Therefore, the invention can automatically self-adaptively adjust the air exhaust shutter 7 of each air exhaust section 5 according to the air quality condition of each position in the mine 1, greatly improves the utilization rate of the exhaust fan, does not need to use electric equipment such as a gas concentration sensor, an electric air door and the like, and has more energy saving and lower risk.
In addition, as shown in fig. 5 and 6, a plurality of air inlet side pipes 13 are uniformly arranged at the top of the air inlet pipeline 3, a cover-shaped air distribution head 14 is arranged at the outer end of each air inlet side pipe 13, the air distribution head 14 is in threaded connection with the air inlet side pipes 13, a plurality of annular gaps are uniformly arranged on the side wall of the air distribution head 14, the annular gaps form the air outlet louver 4, and the annular gaps are inclined downwards from inside to outside so that the air outlet louver 4 is in an annular inclined downwards air outlet mode. Therefore, the fresh air exhausted by the air outlet shutter 4 can be more uniformly dispersed at each part in the mine 1, and the underground environment is better improved. In order to avoid that the exhaust duct 2 directly discharges the fresh air supplemented into the air inlet duct 3 in the process of air exhaust and air inlet, the positions of the air inlet side pipes 13 and the air exhaust section 5 are mutually staggered, and the distance in the horizontal direction is at least 5 meters.
In addition, as shown in fig. 7, in order to prevent water accumulation in the mine 1, the bottom of the air inlet pipe 3 of the present invention is further provided with a water collecting tank 15, a plurality of water seepage holes 16 are formed on the side wall of the water collecting tank 15, and the lower part of the air inlet pipe 3 is buried underground. Therefore, a part of accumulated water in the mine 1 can enter the water collecting tank 15 through the water seepage holes 16, and the problem of accumulated water in the mine 1 is solved conveniently. Meanwhile, the moisture in the water collecting tank 15 can also improve the humidity of the supplemented fresh air, and the accumulated quantity of static electricity in the air is reduced, so that the risk of gas explosion in the mine 1 is further reduced.
Claims (7)
1. The utility model provides a colliery safety energy-conserving ventilation system which characterized in that: the air outlet device comprises an air outlet pipeline (2) arranged on the inner top surface of a mine (1) and an air inlet pipeline (3) arranged on the inner ground surface of the mine (1), wherein a plurality of air outlet shutters (4) are arranged on the air inlet pipeline (3); a plurality of air exhaust sections (5) are uniformly arranged on the air exhaust pipeline (2), the air exhaust sections (5) are in a square tube shape, and two ends of each air exhaust section are connected with the main body part of the air exhaust pipeline (2) through a hemispherical and square pipe (6); exhaust shutters (7) are arranged on two sides of an exhaust section (5), a vertical light thin plate (8) parallel to the side wall of the exhaust section (5) is arranged in the exhaust section (5) on the inner side of each exhaust shutter (7), the top of each light thin plate (8) is connected with the lower end of a sliding rod (9), the upper end of each sliding rod (9) penetrates through a guide hole in the top surface of the exhaust section (5) and is connected with a suspension airbag (10), gas concentration sensitive gas is filled in each suspension airbag (10), the gas concentration sensitive gas is mixed gas of gas and air, and the gas concentration sensitive gas is gas with the density equivalent to that of the mixed gas of the gas and the air when the gas concentration reaches an alert value;
the top of intake stack (3) still evenly is provided with a plurality of air inlet side pipes (13), air inlet side pipe (13) outer end is provided with cloth wind head (14) of lid form, cloth wind head (14) and air inlet side pipe (13) threaded connection, evenly set up multichannel annular gap on the lateral wall of cloth wind head (14), multichannel annular gap constitutes air-out tripe (4).
2. The energy-saving ventilation system for coal mines according to claim 1, characterized in that: and the blades of the air exhaust shutter (7) incline outwards and obliquely upwards.
3. The energy-saving ventilation system for coal mines according to claim 2, characterized in that: the top surface of the air exhaust section (5) is provided with a guide short pipe (11) at a position corresponding to the guide hole, and the sliding rod (9) is matched with the guide short pipe (11) and is positioned in the guide short pipe (11).
4. The energy-saving ventilation system for coal mines according to claim 3, characterized in that: the exhaust pipeline (2) is laid on a mounting frame formed by U-shaped clamps (12), and two ends of each U-shaped clamp (12) are anchored in the rock wall of the top surface of the mine (1).
5. The energy-saving ventilation system for coal mines according to claim 4, characterized in that: the position of the air inlet side pipe (13) and the air exhaust section (5) are mutually staggered, and the distance in the horizontal direction is at least 5 meters.
6. The energy-saving ventilation system for coal mines of claim 5, characterized in that: the annular gap is inclined downwards from inside to outside.
7. The energy-saving ventilation system for coal mines of claim 6, which is characterized in that: the bottom of the air inlet pipeline (3) is also provided with a water collecting tank (15), and the side wall of the water collecting tank (15) is provided with a plurality of water seepage holes (16); the lower part of the air inlet pipeline (3) is buried underground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810214395.3A CN108798744B (en) | 2018-03-15 | 2018-03-15 | Energy-conserving ventilation system of colliery safety |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810214395.3A CN108798744B (en) | 2018-03-15 | 2018-03-15 | Energy-conserving ventilation system of colliery safety |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108798744A CN108798744A (en) | 2018-11-13 |
| CN108798744B true CN108798744B (en) | 2020-05-01 |
Family
ID=64095205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810214395.3A Active CN108798744B (en) | 2018-03-15 | 2018-03-15 | Energy-conserving ventilation system of colliery safety |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108798744B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566265B (en) * | 2019-09-20 | 2021-02-23 | 河南城建学院 | Coal mine underground gas circulating pumping and draining system |
| CN111336633A (en) * | 2020-03-09 | 2020-06-26 | 山东大学 | Ventilation method suitable for waste gas generation place |
| CN111894657A (en) * | 2020-07-16 | 2020-11-06 | 山东华坤地质工程有限公司 | Gas treatment method |
| CN117685039B (en) * | 2024-02-03 | 2024-04-12 | 山西山煤国源煤矿安全技术有限公司 | Coal seam gas extraction device and extraction method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3255405B2 (en) * | 2000-05-17 | 2002-02-12 | 鹿島建設株式会社 | Tunnel ventilation method and device |
| CN101117891A (en) * | 2006-08-03 | 2008-02-06 | 高天奇 | Coal mine gas detecting and draught fan automatic control device |
| CN102661163A (en) * | 2012-05-03 | 2012-09-12 | 耿秀 | Mine gas, blasting fume and dust separation ventilation system |
| CN103670478A (en) * | 2013-12-09 | 2014-03-26 | 淮南矿业(集团)有限责任公司 | Coal mine ventilation system |
| CN205481464U (en) * | 2016-04-06 | 2016-08-17 | 云南滇睿科技发展有限公司 | Energy -conserving ventilating air clean system of pipeline formula |
| CN207033479U (en) * | 2017-07-22 | 2018-02-23 | 山西工程技术学院 | A kind of underground coal mine ventilation unit |
-
2018
- 2018-03-15 CN CN201810214395.3A patent/CN108798744B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108798744A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108798744B (en) | Energy-conserving ventilation system of colliery safety | |
| CN102660961A (en) | Integral underground comprehensive pipe rack | |
| CN202610835U (en) | Integral underground comprehensive pipeline corridor | |
| CN110566265B (en) | Coal mine underground gas circulating pumping and draining system | |
| CN109268054A (en) | It is a kind of for underground big cross section, the ventilating and purifying air system in long distance driving face | |
| CN207590297U (en) | A kind of inflammable thing, poisonous substances cabinet | |
| CN205924803U (en) | Building non -combustible building structure | |
| CN219693510U (en) | Exhaust system of refrigerator room | |
| CN202690072U (en) | Mining roadway structure capable of preventing corner gas on coal mining work face from accumulating | |
| CN204591331U (en) | The mine development end dash system of adjoint high-concentration hydrogen sulfide and gas | |
| CN108468850A (en) | The closed gas pumping control device of underground coal mine | |
| CN201460965U (en) | Mine escaping system | |
| CN208024018U (en) | A kind of coalman's station-service ventilation storehouse | |
| CN215733218U (en) | Fireproof and heat-insulating cable shaft | |
| CN112933464B (en) | Smoke-proof diversion water curtain system and smoke-proof method for building fire | |
| CN206129313U (en) | Automatic control system of flame proof canopy | |
| CN213454053U (en) | High-density hidden-hole pedestrian passageway fire protection system | |
| CN205654371U (en) | Fire damp is taken out and is put drilling yard air water coal separator | |
| CN208778035U (en) | A kind of coal mining gas drainage equipment | |
| CN206530364U (en) | A kind of underground water control arranging device for tunnel | |
| CN208057156U (en) | A kind of segmented oxygen injection device for coal mine | |
| CN116838429B (en) | Gas overrun early warning system and application | |
| CN206252752U (en) | A kind of arch without beam smoke-proof pendant wall | |
| CN213116370U (en) | Coal mine ventilation safety power supply device | |
| CN221220530U (en) | Coal mining ventilation system |
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 | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20200108 Address after: 226600 No.366, Huanghai West Road, Hai'an town, Hai'an City, Nantong City, Jiangsu Province Applicant after: Nantong Pratt Turbine Technology Co., Ltd Address before: 610094 Sichuan Chengdu high tech Zone No. 369 Tianfu street 1 Building 1 unit 21 level 2110 Applicant before: CHENGDU LANTENG TECHNOLOGY CO., LTD. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |