CN107447270B - A kind of polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drafting system and method - Google Patents
A kind of polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drafting system and method Download PDFInfo
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- CN107447270B CN107447270B CN201710766862.9A CN201710766862A CN107447270B CN 107447270 B CN107447270 B CN 107447270B CN 201710766862 A CN201710766862 A CN 201710766862A CN 107447270 B CN107447270 B CN 107447270B
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- air inlet
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- 229920002239 polyacrylonitrile Polymers 0.000 title claims abstract description 13
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 12
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000007380 fibre production Methods 0.000 title abstract description 7
- 230000006837 decompression Effects 0.000 claims abstract description 55
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 19
- 230000008676 import Effects 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims 2
- 239000000835 fiber Substances 0.000 abstract description 12
- 239000002243 precursor Substances 0.000 abstract description 6
- 238000009987 spinning Methods 0.000 abstract description 4
- 238000000280 densification Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/12—Stretch-spinning methods
- D01D5/14—Stretch-spinning methods with flowing liquid or gaseous stretching media, e.g. solution-blowing
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D10/00—Physical treatment of artificial filaments or the like during manufacture, i.e. during a continuous production process before the filaments have been collected
- D01D10/02—Heat treatment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Inorganic Fibers (AREA)
- Treatment Of Fiber Materials (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
This application discloses a kind of polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drafting system and method, device include steam import system, steam and condensate system, babinet, positioned at babinet both sides drawing-off driving, be arranged in the middle part of babinet drawing-off chamber, be successively set on the seal chamber and exhaust decompression chamber of drawing-off chamber both sides；Multigroup air inlet pipe positioned at middle part arranged side by side and the economizer bank and drafting tube positioned at air inlet pipe both sides are provided in the drawing-off cavity；Saturated vapor is imported into the air inlet pipe by the steam import system；Saturated vapor is discharged into steam and condensate system by the exhaust decompression chamber；Drawing-off driving leads tow from the exhaust decompression chamber of babinet side, is involved successively from the exhaust decompression chamber of the babinet other side after seal chamber, economizer bank, air inlet pipe, drafting tube, seal chamber.The advantageous effect of the application is to realize high speed continuous spinning and realize precursor high strengthening, densification, fine-denier, ensure that the homogeneity of fiber.
Description
Technical field
The present disclosure relates generally to technical field of chemical fiber manufacturing, and in particular to high-performance carbon fibre industry is set with production
Standby more particularly to polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drafting system and method.
Background technology
Currently, most domestic carbon fibre precursor manufacturer is all using saturation or the board-like drawing-off technology of superheated steam, plate
The babinet of formula draw box draw box by can manually or upper and lower two parts babinet of hydraulic pressure opening forms, the both ends of upper and lower babinet by
Seal chamber forms, and interlude is drawing-off cavity, and the gap between upper and lower box is 1.0-1.5mm, using technique to fiber
Drawing-off is carried out, drawing-off pressure is low, only 0.15-0.3MPa；Drawing-off babinet is big, and all tow can all be led among a babinet
It causes；1. precursor fracture of wire is more；2. convergence is poor；3. tow long-time passability is poor, interference is easy to happen between tow；4. amount is lost
Greatly, silk can not individually be drawn after small part tow fracture of wire occurring；5. steam drafting multiple is very limited, more high power cannot be carried out
Several drawing-offs, the final performance uniformity for influencing precursor product and the raising for spinning speed.
Invention content
In view of drawbacks described above in the prior art or deficiency, be intended to provide a kind of precursor high strengthening, densification, fine-denier and
High drafting can be achieved, the polyacrylonitrile fibril for carbon fiber of high speed spinning produces pressurize steam pipe type drawing-off technology.
First aspect the application provides a kind of polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drafting system, packet
Include steam import system, steam and condensate system, babinet, positioned at the drawing-off driving of babinet both sides, the drawing-off that is arranged in the middle part of babinet
Chamber, the seal chamber and exhaust decompression chamber for being successively set on drawing-off chamber both sides；It is provided with and multigroup sets side by side in the drawing-off chamber cavity
The air inlet pipe positioned at middle part set and the economizer bank and drafting tube positioned at air inlet pipe both sides；The steam import system will be saturated
Steam is imported into the air inlet pipe；Saturated vapor is discharged into steam and condensate system by the exhaust decompression chamber；The drawing-off is driven
It is dynamic by tow from the exhaust decompression chamber of babinet side lead into, pass through seal chamber, economizer bank, air inlet pipe, drafting tube, seal chamber successively
It is involved afterwards from the exhaust decompression chamber of the babinet other side.
According to technical solution provided by the embodiments of the present application, the exhaust decompression intracavitary corresponds to every group of air inlet pipe, economizer bank
It is both provided with a point exhaust decompression chamber with drafting tube.
According to technical solution provided by the embodiments of the present application, the economizer bank and drafting tube be caliber ranging from 20-50mm,
The stainless steel inner wall polishing pipe that length range is 1.5-3.5mm, pressure-resistant numberical range is 0.7-1.0Mpa.
According to technical solution provided by the embodiments of the present application, the air inlet pipe is caliber ranging from 20-50mm, length range
The stainless steel inner wall for being 0.7-1.0Mpa for 150-300mm, pressure-resistant numberical range polishes pipe.
According to technical solution provided by the embodiments of the present application, caliber ranging from 15-40mm, length model are provided in seal chamber
It encloses the stainless steel inner wall for being 0.7-1.0Mpa for 200-500mm, pressure-resistant numberical range and polishes seal pipe.
According to technical solution provided by the embodiments of the present application, decompression member is arranged in series in the seal pipe；The decompression
Labyrinth sealing cavity is formed between element.
According to technical solution provided by the embodiments of the present application, the decompression member main body is the intermediate annular circle for being equipped with through-hole
The both ends of the surface of column, the cylinder are to the V-type face of the middle part indent of cylinder.
Second aspect, the application also provide a kind of polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drawing-off side
Each tow is pulled into each group by traction drive and is disposed with economizer bank, air inlet pipe and drawing-off by method, this method respectively
It is stretched in the steam drafting system of pipe, has saturated vapor by air inlet pipe introducing in the steam drafting system.
According to technical solution provided by the embodiments of the present application, the end of the economizer bank and drafting tube is connected separately with sealing
Pipe, the end of the seal pipe is connected with the exhaust decompression chamber that steam can be drained into steam and condensate system.
According to technical solution provided by the embodiments of the present application, it is arranged in series in the concentric axis of the seal pipe
Decompression member；Labyrinth sealing cavity is formed between the decompression member.
The advantageous effect of the application is：It is real to the fiber after hot-rolling under saturated steam conditions in drafting process
High drafting is applied, drawing-off is carried out to fiber using saturated vapor, since there is saturated vapor very high kinetic energy, vapor to hold very much
The inside of fiber holes is easily penetrated into, heating effect is rapid, uniform, and fiber can be made to realize the drawing-off of high magnification numbe under humid tropical condition,
Drafting multiple is up to 3~5 times；Also may be used after fracture of wire so not interfere with each other between tow since a tow corresponds to a drafting tube
Drawing-off is carried out with the silk with pressure that draws again, the homogeneity of precursor performance can be effectively improved and realize high speed continuous spinning.Realize original
Silk high strengthening, densification, fine-denier, ensure that the homogeneity of fiber；Distinctive sealing technique ensures in steam traction case body
Pressure is constant.
Description of the drawings
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon：
Fig. 1 is a kind of structural schematic diagram of embodiment of the application；
Fig. 2 is the structural schematic diagram of decompression member in the application.
Figure label:
10, steam import system；20, steam and condensate system；30, babinet；40, drawing-off drives；31, drawing-off chamber；32, it seals
Chamber；33, exhaust decompression chamber；34, air inlet pipe；35, the economizer bank of both sides；36, drafting tube；37, seal pipe；38, decompression member.
Specific implementation mode
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, is illustrated only in attached drawing and invent relevant part.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
It please refers to Fig.1 and produces pressurize steam pipe type drafting system one kind for a kind of polyacrylonitrile fibril for carbon fiber of the application
The structural schematic diagram of embodiment, including steam import system 10, steam and condensate system 20, babinet 30, leading positioned at babinet both sides
Stretch driving 40, be arranged the middle part of babinet 30 drawing-off chamber 31, be successively set on the seal chamber 32 of 31 both sides of drawing-off chamber and exhaust subtracts
Press chamber 33；It is provided with multigroup air inlet pipe 34 positioned at middle part arranged side by side in 31 cavity of drawing-off chamber and is located at air inlet pipe
The economizer bank 35 and drafting tube 36 of 34 both sides；Saturated vapor is imported into the air inlet pipe 34 by the steam import system 10；
Saturated vapor is discharged into steam and condensate system 20 by the exhaust decompression chamber 33；Drawing-off driving 40 is by tow from babinet 30 1
The exhaust decompression chamber 33 of side leads, successively after seal chamber 32, economizer bank 35, air inlet pipe 34, drafting tube 36, seal chamber 32 from
The exhaust decompression chamber 33 of 30 other side of babinet involves.
In the course of work, the drawing-off driving 40 in tow left side from Fig. 1 is led into from left to right successively by exhaust decompression chamber
33, the seal chamber after seal chamber 32, the economizer bank 35 in drawing-off chamber 31, air inlet pipe 34 and drafting tube 36 from 10 right side of babinet and row
Gas relief chamber 33 is drawn.Saturated vapor is imported out of steam import system 10 in air inlet pipe 34, then respectively from 35 He of economizer bank
Drafting tube 36 flows in the cavity of 30 both sides of babinet, finally flows back to steam and condensate system from the exhaust decompression chamber 33 of 30 both sides of babinet
Interior recycling discharge.
In a preferred embodiment, every group of air inlet pipe 34, economizer bank 35 and drafting tube are corresponded in the exhaust decompression chamber 33
36 are both provided with independent point of exhaust decompression chamber；Exhaust decompression chamber is divided to be connected again with steam and condensate system by delivery pipe.Make
The pressure environment of every tow is obtained not by mutual interference.
By above-mentioned polyacrylonitrile fibril for carbon fiber produce pressurize steam pipe type drafting system with 0.4Mpa, 0.45Mpa,
The saturated vapor of 0.5Mpa, 0.55Mpa pressure carries out drawing-off to fiber, and the limit after counter extensioin measures, and experimental data is such as
Shown in the following table 1：
| The pressure of saturated vapor | Survey the drafting multiple of fiber |
| 0.4Mpa | 3 times |
| 0.45Mpa | 3.5 again |
| 0.5Mpa | 4 times |
| 0.55Mpa | 4.3 again |
Table 1
Such as in the prior art board-like draw box drawing-off pressure be 0.28MPa when, drafting multiple be 2.2 times, from above-mentioned reality
Test data as it can be seen that the drawing-off pressure namely saturated vapor in compared with the prior art pressure 0.15-0.3Mpa, the skill of the application
Not only the pressure of saturated vapor has obtained greatly being promoted in art scheme, and drafting multiple also realizes multiple growth substantially.
In the above-described embodiments, the economizer bank 35 and drafting tube 36 are caliber ranging from 20-50mm, length range is
The stainless steel inner wall polishing pipe that 1.5-3.5mm, pressure-resistant numberical range are 0.7-1.0Mpa.
In the above-described embodiments, the air inlet pipe 34 be caliber ranging from 20-50mm, it is length range 150-300mm, resistance to
Press the stainless steel inner wall polishing pipe that numberical range is 0.7-1.0Mpa.
In the above-described embodiments, be provided in seal chamber 32 caliber ranging from 15-40mm, length range 200-500mm,
The stainless steel inner wall that pressure-resistant numberical range is 0.7-1.0Mpa polishes seal pipe 37.
In a preferred embodiment, it is arranged in series decompression member 38 in the concentric axis of the seal pipe 37；The decompression
Labyrinth sealing cavity is formed between element 38.
In a preferred embodiment, two concatenated structural schematic diagrams of decompression member are illustrated in figure 2, arrow direction in figure
For steam circulating direction, 38 main body of the decompression member is the intermediate ring-shaped cylinder for being equipped with through-hole, and the both ends of the surface of the cylinder are equal
For to the V-type face of the middle part indent of cylinder；Through-hole arranged in series between decompression member, steam pass through a series of well-regulated
Gap and expansion cavity, energy and pressure constantly reduce, to have the function that decompression and sealing.Two V at decompression member both ends
The angle in type face is respectively α and β, ranging from 45-95 ° of wherein α, ranging from 80-120 ° of β；The through-hole diameter of decompression member
Ranging from 4-10mm.
Second aspect the application provides a kind of polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drafting method, leads to
It crosses traction drive 40 each tow is pulled into each group respectively and be disposed with economizer bank 35, air inlet pipe 34, drafting tube 36
Drawing-off is carried out in steam drafting system, being introduced by air inlet pipe in the steam drafting system has saturated vapor.
In a preferred embodiment, the end of the economizer bank 35 and drafting tube 36 is connected separately with seal pipe 37, described
The end of seal pipe 37 is connected with the exhaust decompression chamber 33 that steam can be drained into steam and condensate system.
In a preferred embodiment, it is arranged in series decompression member 38 in the seal pipe 37；Between the decompression member 38
Form labyrinth sealing cavity.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Other technical solutions of arbitrary combination and formation.Such as features described above has similar work(with (but not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (6)
1. a kind of polyacrylonitrile fibril for carbon fiber produces pressurize steam pipe type drafting system, which is characterized in that led including steam
Enter system (10), steam and condensate system (20), babinet (30), the drawing-off driving (40) positioned at babinet both sides, setting in babinet
(30) drawing-off chamber (31) in the middle part of, the seal chamber (32) and exhaust decompression chamber (33) for being successively set on drawing-off chamber (31) both sides；Institute
It states and is provided with multigroup air inlet pipe (34) positioned at middle part arranged side by side in drawing-off chamber (31) cavity and is located at air inlet pipe (34)
The economizer bank (35) and drafting tube (36) of both sides；Saturated vapor is imported into the air inlet pipe by the steam import system (10)
(34) in；Saturated vapor is discharged into steam and condensate system (20) by the exhaust decompression chamber (33)；The drawing-off driving (40) will
Tow is led from the exhaust decompression chamber (33) of babinet (30) side into, the seal chamber (32) that passes through drawing-off chamber (31) side successively, pre-
Heat pipe (35), air inlet pipe (34), drafting tube (36), drawing-off chamber (31) other side seal chamber (32) after from babinet (30) other side
Exhaust decompression chamber (33) involve；It is provided with seal pipe (37) in the seal chamber (32)；The concentric shafts of the seal pipe (37)
Decompression member (38) is arranged in series on line；Labyrinth sealing cavity is formed between the decompression member (38)；The decompression member
(38) main body is the intermediate ring-shaped cylinder for being equipped with through-hole, and the both ends of the surface of the cylinder are to the V-type face of the middle part indent of cylinder；
The angle in the V-type face of the steam upstream end of the decompression member (38) is α；The V of the steam outflow end of the decompression member (38)
The angle in type face is β, ranging from 45-95 ° of α, ranging from 80-120 ° of β.
2. drafting system according to claim 1, which is characterized in that correspond to every group of air inlet in the exhaust decompression chamber (33)
Pipe (34), economizer bank (35) and drafting tube (36) are both provided with independent point of exhaust decompression chamber (33).
3. drafting system according to claim 2, which is characterized in that the economizer bank (35) and drafting tube (36) are caliber
The stainless steel inner wall polishing pipe that ranging from 20-50mm, length range 1.5-3.5mm, pressure-resistant numberical range are 0.7-1.0Mpa.
4. drafting system according to any one of claims 1 to 3, which is characterized in that the air inlet pipe (34) is caliber model
It encloses the stainless steel inner wall for being 0.7-1.0Mpa for 20-50mm, length range 150-300mm, pressure-resistant numberical range and polishes pipe.
5. drafting system according to any one of claims 1 to 3, which is characterized in that the seal pipe (37) is caliber model
It encloses the stainless steel inner wall for being 0.7-1.0Mpa for 15-40mm, length range 200-500mm, pressure-resistant numberical range and polishes sealing
Pipe.
6. a kind of producing pressurize steam pipe type drafting system drawing-off using polyacrylonitrile fibril for carbon fiber described in claim 1
The method of polyacrylonitrile fibril, which is characterized in that each tow is pulled into successively by each group by drawing-off driving (40) respectively
It is provided in economizer bank (35), air inlet pipe (34), the steam drafting system of drafting tube (36) and carries out drawing-off, the steam drafting system
There is saturated vapor by air inlet pipe introducing in system；The end of the economizer bank (35) and drafting tube (36) is connected separately with seal pipe
(37), the end of the seal pipe (37) is connected with the exhaust decompression chamber (33) that steam can be drained into steam and condensate system；Institute
It states in seal pipe (37) and is arranged in series decompression member (38)；Labyrinth sealing cavity, institute are formed between the decompression member (38)
It is the intermediate ring-shaped cylinder for being equipped with through-hole to state decompression member (38) main body, and the both ends of the surface of the cylinder are into the middle part of cylinder
Recessed V-type face；The angle in the V-type face of the steam upstream end of the decompression member (38) is α；The steam of the decompression member (38)
The angle in the V-type face of outflow end is β, ranging from 45-95 ° of α, ranging from 80-120 ° of β.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710766862.9A CN107447270B (en) | 2017-08-31 | 2017-08-31 | A kind of polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drafting system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710766862.9A CN107447270B (en) | 2017-08-31 | 2017-08-31 | A kind of polyacrylonitrile fibril for carbon fiber production pressurize steam pipe type drafting system and method |
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| CN107447270B true CN107447270B (en) | 2018-10-30 |
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| CN108588869A (en) * | 2018-03-16 | 2018-09-28 | 常熟市翔鹰特纤有限公司 | A kind of steam bath hot gas spring system and hot gas spring method |
| CN113652757B (en) * | 2021-08-09 | 2022-09-02 | 山东联甲纺织有限公司 | Steam heating device of short fiber production line |
| CN113802196A (en) * | 2021-10-21 | 2021-12-17 | 荣成碳纤维科技有限公司 | Carbon fiber precursor production steam drafting device with automatic shredding and collecting device |
| CN114150439A (en) * | 2021-11-29 | 2022-03-08 | 厦门当盛新材料有限公司 | Drawing device of flash spinning tow net and flash spinning equipment |
| CN115652457B (en) * | 2022-11-18 | 2023-05-26 | 中复神鹰碳纤维西宁有限公司 | Device for saving steam energy consumption in carbon fiber precursor production |
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| CN105671669A (en) * | 2014-11-20 | 2016-06-15 | 中国石油化工股份有限公司 | Preparation method of polyacrylonitrile-based carbon fiber precursor |
| CN206204495U (en) * | 2016-11-16 | 2017-05-31 | 哈尔滨天顺化工科技开发有限公司 | A kind of carbon fibre precursor spinning compacting by drying device |
| CN106906527A (en) * | 2017-04-28 | 2017-06-30 | 山西钢科碳材料有限公司 | A kind of big the tow many pressurization of spinning position polyacrylonitrile fiber steam drafting system and methods |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09157938A (en) * | 1995-12-08 | 1997-06-17 | Musashino Kikai:Kk | Stretching method of yarn-like polymer material and device therefor |
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- 2017-08-31 CN CN201710766862.9A patent/CN107447270B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105671669A (en) * | 2014-11-20 | 2016-06-15 | 中国石油化工股份有限公司 | Preparation method of polyacrylonitrile-based carbon fiber precursor |
| CN206204495U (en) * | 2016-11-16 | 2017-05-31 | 哈尔滨天顺化工科技开发有限公司 | A kind of carbon fibre precursor spinning compacting by drying device |
| CN106906527A (en) * | 2017-04-28 | 2017-06-30 | 山西钢科碳材料有限公司 | A kind of big the tow many pressurization of spinning position polyacrylonitrile fiber steam drafting system and methods |
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Address after: 065000 Hebei Langfang Anci Langfang high tech Industrial Development Zone, Longxian Road south of Fengxiang Road West Applicant after: ZHONG AN XIN TECHNOLOGY CO.,LTD. Applicant after: KANGDE CARBON VALLEY TECHNOLOGY CO.,LTD. Address before: 065000 Hebei, Langfang, Anci, south of Ruifeng Road, Chang Fu Road. Applicant before: ZHONG AN XIN TECHNOLOGY CO.,LTD. Applicant before: KANGDE CARBON VALLEY TECHNOLOGY CO.,LTD. |
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