CN109466946A - A kind of dust pelletizing system applied to loading and unloading process - Google Patents
A kind of dust pelletizing system applied to loading and unloading process Download PDFInfo
- Publication number
- CN109466946A CN109466946A CN201811428318.4A CN201811428318A CN109466946A CN 109466946 A CN109466946 A CN 109466946A CN 201811428318 A CN201811428318 A CN 201811428318A CN 109466946 A CN109466946 A CN 109466946A
- Authority
- CN
- China
- Prior art keywords
- ash
- loading
- sack cleaner
- blower
- dust
- 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
- 239000000428 dust Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008569 process Effects 0.000 title claims abstract description 28
- 238000005453 pelletization Methods 0.000 title claims abstract description 16
- 238000005192 partition Methods 0.000 claims abstract description 14
- 238000003860 storage Methods 0.000 claims abstract description 13
- 238000007599 discharging Methods 0.000 claims description 17
- 244000144985 peep Species 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 230000032258 transport Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000005532 trapping Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
- B65G69/18—Preventing escape of dust
- B65G69/181—Preventing escape of dust by means of sealed systems
- B65G69/182—Preventing escape of dust by means of sealed systems with aspiration means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/48—Arrangements of indicating or measuring devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
- B65G53/34—Details
- B65G53/40—Feeding or discharging devices
- B65G53/48—Screws or like rotary conveyors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/32—Filling devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Auxiliary Methods And Devices For Loading And Unloading (AREA)
- Air Transport Of Granular Materials (AREA)
Abstract
The invention discloses a kind of dust pelletizing systems applied to loading and unloading process, including partial enclosure, air-suction cover partition, capturing hood, air hose, spiral ash machine, valve, sack cleaner, defeated ash exhauster, bucket elevator, store ash cellar, level-sensing device, exhaust outlet and dust pelletizing system, blower, exhaust chimney, in actual production process, dust passes through capturing hood, air hose, reach sack cleaner, coke powder is transported to storage ash cellar by defeated ash exhauster and bucket elevator, the fugitive dust in sack cleaner can be transported in exhaust chimney by blower simultaneously is handled, in process of production, dust passes through capturing hood, air hose, reach sack cleaner, coke powder is transported to storage ash cellar by defeated ash exhauster and bucket elevator, fugitive dust in sack cleaner is transported in exhaust chimney and handles by blower, to fortune mobile during this Defeated raw material has carried out dust removal process, enhances monitoring of the worker to overall process.
Description
Technical field
The present invention relates to a kind of dust pelletizing systems applied to loading and unloading process.
Background technique
It with the development of industrialization and is promoted, the demand of China's energy is in apparent ascendant trend, industrialized herein
In process, the pressure that environment is born is gradually increased, and energy-saving and emission-reduction face the situation of very severe.And industrial dust is in emission reduction
Important content.
In traditional coke-oven plant, serious reentrainment of dust can be generated during discharging, entrucking, causes environment dirt
Dye, threatens the health and personal safety of operator.And during traditional loading and unloading, imperfect equipment pair
The raw material of mobile transport is dusted processing, and the pollution of fugitive dust has been further aggravated.
Summary of the invention
The purpose of the present invention is to provide a kind of dust pelletizing systems applied to loading and unloading process, to solve in traditional coking
In factory, serious reentrainment of dust can be generated during discharging, entrucking, environmental pollution is caused, threatens operator's
Health and personal safety, and during traditional loading and unloading, imperfect equipment carries out the raw material of mobile transport
Dust removal process, the technical issues of pollution of fugitive dust has been further aggravated.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of dust pelletizing system applied to loading and unloading process, including partial enclosure, air-suction cover partition, capturing hood,
Air hose, spiral ash machine, valve, sack cleaner, defeated ash exhauster, bucket elevator, storage ash cellar, level-sensing device, exhaust outlet, wind
Machine and exhaust chimney, the upper layer in discharging building passes through bolt and is equipped with partial enclosure, and partial enclosure is located at discharging building
Above the discharge port of upper layer setting, the discharge port of burnt bottom of the building layer passes through bolt and is equipped with capturing hood, capturing hood with
Air hose connection, and the top of air hose is equipped with inclined plate, the bottom end of inclined plate is equipped with spiral ash machine, is installed on air hose by bolt
There is valve, the bottom end of spiral ash machine is equipped with sack cleaner, and the bottom end of sack cleaner is equipped with defeated ash exhauster, and
One end of defeated ash exhauster is connected with bucket elevator by belt, and the top of bucket elevator is connected with storage ash by belt
Storehouse.
As further scheme of the invention, peep hole is provided on partial enclosure, discharging is equipped with air-breathing between building
Cover partition, air-suction cover partition are the retractable structure along vestibule direction.
As further scheme of the invention, valve is Hand-operated butterfly valve or electric butterfly valve.
As further scheme of the invention, stores in ash cellar and several level-sensing devices are equipped with by bolt, several level-sensing devices
Quantity at least two.
As further scheme of the invention, stores ash cellar upper end and be provided with exhaust outlet.
As further scheme of the invention, one end of sack cleaner is provided with blower, blower and pipeline and pocket type
Deduster is connected, and blower is total pressure in 2000-8000Pa, air quantity 10000-1000000m3/h。
As further scheme of the invention, exhaust chimney is connected with blower and pipeline, and the bottom end of exhaust chimney is set
There are ash removing opening, drainage hole and manhole.
Beneficial effects of the present invention: compared with previous automobile loading and unloading process, a kind of perfect equipment solution is provided not only
Certainly entrucking, discharge process fugitive dust problem, and dust removal process has been carried out to raw material of transport mobile during this, carried out simultaneously
Effectively monitor, using tissue air-flow by dust controlling in a certain range, and to dusty gas through sack cleaner, make to unload
Coke powder fugitive dust during material is effectively absorbed, and National Emission Standard is met.
Detailed description of the invention
In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the drawings.
Fig. 1 is a kind of dust pelletizing system structural schematic diagram applied to loading and unloading process of the present invention.
Fig. 2 is spiral ash machine front view of the present invention.
Fig. 3 is installation diagram inside spiral ash machine of the present invention.
In figure: 1, partial enclosure；2, air-suction cover partition；3, capturing hood；4, air hose；5, spiral ash machine；6, valve
Door；7, sack cleaner；8, defeated ash exhauster；9, bucket elevator；10, ash cellar is store；11, level-sensing device；12, exhaust outlet；13, wind
Machine；14, exhaust chimney；15, feed inlet；16, first rotating shaft；17, first gear；18, material storing box；19, motor；20, the second tooth
Wheel；21, third gear；22, the 4th gear；23, shell；24, discharge port；25, baffle；26, support shaft；27, rotating vane；
28, blower.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with embodiment, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
Logical technical staff all other embodiment obtained without creative efforts belongs to what the present invention protected
Range.
It please refers to shown in Fig. 1-3, a kind of dust pelletizing system applied to loading and unloading process, including partial enclosure 1, air-suction cover
Partition 2, capturing hood 3, air hose 4, spiral ash machine 5, valve 6, sack cleaner 7, defeated ash exhauster 8, bucket elevator
9, ash cellar 10, level-sensing device 11, exhaust outlet 12, blower 13 and exhaust chimney 14 are store, wherein pacify by bolt on the upper layer in discharging building
Equipped with partial enclosure 1, and partial enclosure 1 is located above the discharge port of upper layer setting in discharging building, and partial enclosure 1 is to object
The fugitive dust generated when expecting by slipping burnt slot carries out trapping control, and peep hole is provided on partial enclosure 1, and discharging is pacified between building
Equipped with air-suction cover partition 2, air-suction cover partition 2 is the retractable structure along vestibule direction, can make respectively to unload by being promoted and being pushed
It is in connection or partition state before material building, air-suction cover partition 2 is promoted to a high position before vehicle discharging, will be inhaled after the completion of discharging
Gas hood partition 2 is fallen, and the discharge port of burnt bottom of the building layer passes through bolt and is equipped with capturing hood 3, capturing hood 3 and air hose 4
Connection, and the top of air hose 4 is equipped with inclined plate, the bottom end of inclined plate is equipped with spiral ash machine 5, and spiral ash machine 5 is installed on tiltedly
Board bottom end can prevent dust from blocking and transport away the dust deposited in air hose 4 in time, be equipped with valve by bolt on air hose 4
6, valve 6 is preferably that Hand-operated butterfly valve or electric butterfly valve can be controlled discharging entrucking and be produced in the process by the folding of control valve 6
Raw coke powder fugitive dust is entered in spiral ash machine 5 by capturing hood 3 by air hose 4, and the bottom end of spiral ash machine 5 is equipped with
Sack cleaner 7, and spiral ash machine 5 transports coke powder fugitive dust to sack cleaner 7, when sack cleaner 7 works normally
The dusty gas of multiple discharge port capturing hood trappings is handled respectively, and the bottom end of sack cleaner 7 is equipped with defeated ash discharge dress
8 are set, and one end of defeated ash exhauster 8 is connected with bucket elevator 9 by belt, the top of bucket elevator 9 is connected by belt
It is connected to storage ash cellar 10, is transported on defeated ash exhauster 8 by the dust of sack cleaner 7, then passes through connection bucket elevator 9
Dust is transported in storage ash cellar 10, several level-sensing devices 11, the number of several level-sensing devices 11 are equipped with by bolt in storage ash cellar 10
Amount at least two, for several level-sensing devices 11 for determining storage ash quantity, storage 10 upper end of ash cellar is provided with exhaust outlet 12,12 energy of exhaust outlet
Enough prevent dust pollution again.
One end of sack cleaner 7 is provided with blower 13, and blower 13 is connected by pipeline with sack cleaner 7, blower 13
Total pressure is selected to be adjusted in 2000-8000Pa, air quantity 10000-1000000m3/h.
Exhaust chimney 14 is connected with blower 13 by pipeline, and the bottom end of exhaust chimney 14 be equipped with ash removing opening, drainage hole and
Manhole.
Spiral ash machine 5 includes feed inlet 15, first rotating shaft 16, first gear 17, material storing box 18, motor 19, the second tooth
Wheel 20, third gear 21, the 4th gear 22, shell 23, discharge port 24, baffle 25, support shaft 26, rotating vane 27 and blower
28, wherein feed inlet 15 is connected to air hose 4, the V-shaped structure of feed inlet 15, and the bottom end of feed inlet 15 and is communicated with material storing box
18, the lower horizontal of feed inlet 15 is equipped with first rotating shaft 16, and the both ends of first rotating shaft 16 pass through bearing and feed inlet 15
Inner wall rotation connection, and several stirring blades are equidistantly welded in first rotating shaft 16, one end of first rotating shaft 16 is through charging
Mouth 15 is rotatably connected to first gear 17 by key, by the way that first rotating shaft 16 is arranged, and is equidistantly welded in first rotating shaft 16
Several stirring blades, so that first rotating shaft 16 drives several stirring blades to be rotated when rotating, to fall into from air hose 4
Coke powder be stirred, weaving coke powder there is agglomeration to be not easy to convey, one end of material storing box 18, which is bolted, is equipped with motor
19, the output shaft of motor 19 is rotatably connected to second gear 20 by key, and the bottom end of material storing box 18 is communicated with shell 23, shell 23
It is inside horizontally installed with transmission shaft, several rotating vanes 27 are equidistantly provided on transmission shaft, and shell is run through in one end of transmission shaft
18 are rotatably connected to third gear 21 by key, and one end of third gear 21 is provided with the 4th gear 22, and the 4th gear 22 passes through
Key and transmission shaft are rotatablely connected, and second gear 20 is flexibly connected by the first belt with third gear 21, and the 4th gear 22 passes through
Second belt is flexibly connected with first gear 17, and motor 19 drives third gear 21 to rotate by the first belt, third gear 21
It drives first gear 17 to rotate by the second belt, and then stirring blade is driven to be rotated, while third gear 21 drives and passes
Moving axis rotation, and then drive rotating vane 27 to rotate, and then transmit coke powder from one end of material storing box 18 by rotating vane 278
To the other end, shell 23 is bolted far from one end outside of motor 19 and is equipped with blower 28, one end setting of blower 28
There is baffle 25, baffle 25 is fixedly connected by support shaft 26 with shell 23, and support shaft 26 is fixed by threaded hole and shell 23
Connection can protect blower not receive collision by the way that baffle 25 is arranged, and shell 23 is communicated with discharging close to the side bottom end of blower 28
Mouth 24, the coke powder that rotating vane 27 transmits can be further driven out outside shell 23 by discharge port 24, and by opening blower 28
It can speed up moving direction and speed of the coke powder in shell 23.
The present invention provides not only a kind of perfect equipment solution entrucking, discharging compared with previous automobile loading and unloading process
The fugitive dust problem of process, and dust removal process has been carried out to the raw material of transport mobile during this, while effectively being supervised
Control, using tissue air-flow by dust controlling in a certain range, and dusty gas is made in discharge process through sack cleaner
Coke powder fugitive dust is effectively absorbed, and National Emission Standard is met.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, also not limiting the invention is only the specific embodiment.It obviously, can according to the content of this specification
It makes many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention only by
The limitation of claims and its full scope and equivalent.
Claims (7)
1. a kind of dust pelletizing system applied to loading and unloading process, which is characterized in that including partial enclosure (1), air-suction cover partition
(2), capturing hood (3), air hose (4), spiral ash machine (5), valve (6), sack cleaner (7), defeated ash exhauster (8),
Bucket elevator (9), storage ash cellar (10), level-sensing device (11), exhaust outlet (12), blower (13) and exhaust chimney (14), discharging building
Upper layer pass through bolt and be equipped with partial enclosure (1), and partial enclosure (1) is located at the discharging of the upper layer setting in discharging building
Above mouthful, the discharge port of burnt bottom of the building layer passes through bolt and is equipped with capturing hood (3), and capturing hood (3) and air hose (4) are even
It is logical, and the top of air hose (4) is equipped with inclined plate, the bottom end of inclined plate is equipped with spiral ash machine (5), and air hose passes through bolt on (4)
It is equipped with valve (6), the bottom end of spiral ash machine (5) is equipped with sack cleaner (7), and the bottom end peace of sack cleaner (7)
Equipped with defeated ash exhauster (8), and one end of defeated ash exhauster (8) is connected with bucket elevator (9), bucket elevator by belt
(9) top is connected with storage ash cellar (10) by belt.
2. a kind of dust pelletizing system applied to loading and unloading process according to claim 1, which is characterized in that the part is close
It closes on cover (1) and is provided with peep hole, be equipped between discharging building air-suction cover partition (2), air-suction cover partition (2) is along vestibule direction
Retractable structure.
3. a kind of dust pelletizing system applied to loading and unloading process according to claim 1, which is characterized in that the valve
It (6) is Hand-operated butterfly valve or electric butterfly valve.
4. a kind of dust pelletizing system applied to loading and unloading process according to claim 1, which is characterized in that the storage ash cellar
(10) it is equipped with several level-sensing devices (11) in by bolt, the quantity at least two of several level-sensing devices (11).
5. a kind of dust pelletizing system applied to loading and unloading process according to claim 1, which is characterized in that the storage ash cellar
(10) upper end is provided with exhaust outlet (12).
6. a kind of dust pelletizing system applied to loading and unloading process according to claim 1, which is characterized in that the pocket type removes
One end of dirt device (7) is provided with blower (13), and blower (13) is connected by pipeline with sack cleaner (7), and blower (13) is complete
It is pressed in 2000-8000Pa, air quantity 10000-1000000m3/h。
7. a kind of dust pelletizing system applied to loading and unloading process according to claim 1, which is characterized in that the exhaust cigarette
Chimney (14) is connected with blower (13) by pipeline, and the bottom end of exhaust chimney (14) is equipped with ash removing opening, drainage hole and manhole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811428318.4A CN109466946A (en) | 2018-11-27 | 2018-11-27 | A kind of dust pelletizing system applied to loading and unloading process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811428318.4A CN109466946A (en) | 2018-11-27 | 2018-11-27 | A kind of dust pelletizing system applied to loading and unloading process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109466946A true CN109466946A (en) | 2019-03-15 |
Family
ID=65674557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811428318.4A Pending CN109466946A (en) | 2018-11-27 | 2018-11-27 | A kind of dust pelletizing system applied to loading and unloading process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109466946A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115140558A (en) * | 2022-08-25 | 2022-10-04 | 湖南核三力技术工程有限公司 | Low-fragmentation air force conveying method and device based on wind flow layer exchange in pipeline |
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| CN103771152A (en) * | 2014-01-10 | 2014-05-07 | 新兴能源装备股份有限公司 | Lime rotary kiln raw material underground discharging ditch system |
| US20140339139A1 (en) * | 2013-05-15 | 2014-11-20 | Pelletron Corporation | Autonomously functioning mobile dedusting apparatus with downstream filling station for receptacles |
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| CN206875994U (en) * | 2017-04-27 | 2018-01-12 | 新晃县顺发铁合金有限公司 | A kind of electric furnace for high carbon ferro-chrome production |
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| CN209291590U (en) * | 2018-11-27 | 2019-08-23 | 安徽欣创节能环保科技股份有限公司 | A kind of dust pelletizing system applied to loading and unloading process |
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2018
- 2018-11-27 CN CN201811428318.4A patent/CN109466946A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20140339139A1 (en) * | 2013-05-15 | 2014-11-20 | Pelletron Corporation | Autonomously functioning mobile dedusting apparatus with downstream filling station for receptacles |
| CN203486597U (en) * | 2013-09-10 | 2014-03-19 | 中建中环工程有限公司 | Dust removal system of grab bucket discharge |
| CN103771152A (en) * | 2014-01-10 | 2014-05-07 | 新兴能源装备股份有限公司 | Lime rotary kiln raw material underground discharging ditch system |
| CN104826416A (en) * | 2015-05-08 | 2015-08-12 | 中冶焦耐工程技术有限公司 | Coke oven roof multi-source occasional smoke dust collecting and purifying complete equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115140558A (en) * | 2022-08-25 | 2022-10-04 | 湖南核三力技术工程有限公司 | Low-fragmentation air force conveying method and device based on wind flow layer exchange in pipeline |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Hu Jia Inventor after: Zhang Yueheng Inventor after: Li Feng Inventor after: Sun Tingyu Inventor after: Yang Hong Inventor after: Jiang Mengxi Inventor after: Shi Deming Inventor after: Wu Chaogang Inventor after: Bao Zili Inventor after: Fang Hui Inventor after: Xia Yongjun Inventor after: Zheng Huaquan Inventor after: Chen Wence Inventor after: Xia Xiaohu Inventor before: Hu Jia Inventor before: Zhang Yueheng Inventor before: Li Feng Inventor before: Sun Yanyu Inventor before: Yang Hong Inventor before: Jiang Mengxi Inventor before: Shi Deming Inventor before: Wu Chaogang Inventor before: Bao Zili Inventor before: Fang Hui Inventor before: Xia Yongjun Inventor before: Zheng Huaquan Inventor before: Chen Wence Inventor before: Xia Xiaohu |