CN211896679U - Vacuum wire drawing furnace for manufacturing optical fiber - Google Patents
Vacuum wire drawing furnace for manufacturing optical fiber Download PDFInfo
- Publication number
- CN211896679U CN211896679U CN202020179138.3U CN202020179138U CN211896679U CN 211896679 U CN211896679 U CN 211896679U CN 202020179138 U CN202020179138 U CN 202020179138U CN 211896679 U CN211896679 U CN 211896679U
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- vacuum
- drawing furnace
- wire drawing
- outer cover
- optical fiber
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- 238000005491 wire drawing Methods 0.000 title claims abstract description 95
- 239000013307 optical fiber Substances 0.000 title claims abstract description 83
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 80
- 239000004038 photonic crystal Substances 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 33
- 239000010439 graphite Substances 0.000 claims abstract description 33
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007380 fibre production Methods 0.000 claims 1
- 239000012535 impurity Substances 0.000 abstract description 2
- 238000012681 fiber drawing Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention provides a vacuum wire-drawing furnace for manufacturing optical fibers, which comprises an optical fiber preform, a chamber outer cover of the wire-drawing furnace, a wire-drawing furnace body, a second vacuum zone outer cover, a core heating zone outer cover, a heating coil and a graphite piece, wherein the second vacuum zone outer cover is arranged on the core heating zone outer cover; a first vacuum area is enclosed among the outer cover of the chamber of the wire drawing furnace, the outer cover of the second vacuum area and the wire drawing furnace body; a second vacuum area is enclosed between the second vacuum area outer cover and the wire drawing furnace body; a core heating area is enclosed between the outer cover of the core heating area and the wire drawing furnace body; the optical fiber perform passes wire drawing stove chamber dustcoat, second vacuum zone and wire drawing stove body in proper order to stretch into the core zone of heating bottom in the wire drawing stove, core zone of heating bottom is equipped with graphite spare, and graphite spare upside is equipped with the round heating coil along optical fiber perform's circumference. The invention has more optimized structural design, no impurity pollution, lower cost and better fiber parameter consistency when drawing the common fiber, and has the capability of drawing the photonic crystal fiber with a complex structure.
Description
Technical Field
The invention relates to the field of optical fiber manufacturing, in particular to a vacuum wire drawing furnace for manufacturing optical fibers.
Background
Optical fiber drawing refers to melting an optical fiber preform with a certain diameter on line through a drawing device and drawing the optical fiber preform into an optical fiber with certain geometric requirements. The heating equipment for melting the optical fiber preform (commonly referred to as the fiber drawing furnace) is one of the core equipments of the fiber drawing process, and it can directly affect many important technical parameters of the fiber, such as geometrical parameters, fiber attenuation, fiber strength, polarization mode dispersion, etc. The traditional optical fiber drawing furnace can draw single-mode optical fibers (G.652, G.653, G.654, G.655, G.657 and the like), multi-mode optical fibers (OM 1, OM2, OM3, OM4 and the like).
At present, a traditional wire drawing furnace in the optical fiber industry is a direct current resistance heating furnace and a medium-high frequency alternating current induction heating furnace, wherein the working principle of the direct current resistance heating furnace is that direct current is heated through graphite or other heating bodies, then a graphite central tube is heated through heat conduction and finally radiated to an optical fiber preform, and the preform is heated and melted and finally drawn into a glass optical fiber. The direct current resistance has the defects that the direct current resistance is limited by the size of a heating body, the direct current resistance is difficult to be used in a large-size preform drawing process, the service life of the heating body is short, the heat loss in the heat conduction process is large, and the uniformity of a temperature field is poor. The working principle of the alternating current induction heating furnace is that alternating induction magnetic field is generated by medium-high frequency alternating current passing through a metal spiral coil, graphite or other heating bodies generate eddy current heating in the alternating magnetic field, the heat of the heating bodies is directly radiated to an optical fiber perform, and the optical fiber perform is heated and melted into an optical fiber. The medium-high frequency alternating current induction heating furnace also has the defects of energy consumption waste and the need of process gas to protect heating elements such as graphite pieces.
The optical fiber drawing of the optical fiber with the microstructure is always an industrial problem, and the traditional optical fiber drawing furnace cannot meet the requirement of rigorous uniform temperature field, so that the microstructure optical fiber with qualified geometric dimension cannot be continuously drawn.
Disclosure of Invention
The invention aims to provide a vacuum wire-drawing furnace for manufacturing optical fibers, aiming at solving the problem that the existing optical fiber wire-drawing furnace can not draw micro-structural optical fibers with qualified geometric dimensions.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a vacuum wire drawing furnace for manufacturing optical fibers comprises an optical fiber preform rod, a wire drawing furnace chamber outer cover, a wire drawing furnace body, a second vacuum zone outer cover, a core heating zone outer cover, a heating coil and a graphite piece, wherein the second vacuum zone outer cover is arranged on the outer cover of the core heating zone;
the wire drawing furnace chamber outer cover is arranged on the outer side of the wire drawing furnace body; the second vacuum area outer cover is vertically arranged at the upper part of the wire drawing furnace body and is positioned in the area between the wire drawing furnace chamber outer cover and the wire drawing furnace body; the core heating area outer cover is arranged in the wire drawing furnace body and is arranged from top to bottom along the top of the wire drawing furnace body to the bottom of the wire drawing furnace body; a first vacuum area is defined by the outer cover of the chamber of the wire drawing furnace, the outer cover of the second vacuum area and the wire drawing furnace body; a second vacuum area is formed between the second vacuum area outer cover and the wire drawing furnace body in an enclosing manner; a core heating area is enclosed between the core heating area outer cover and the wire drawing furnace body; the first vacuum area, the second vacuum area and the core heating area are respectively externally connected with a vacuum pump, and the vacuum pumps are used for controlling the internal absolute pressure of each area; the optical fiber perform passes wire drawing stove chamber dustcoat, second vacuum zone and wire drawing stove body in proper order to stretch into the core zone of heating bottom in the wire drawing stove, core zone of heating bottom be equipped with graphite spare, graphite spare upside is equipped with the round heating coil along optical fiber perform's circumference, heating coil heat optical fiber perform through graphite spare.
In order to optimize the technical scheme, the specific measures adopted further comprise:
pulley sealing devices are arranged among the optical fiber preform rod, the outer cover of the chamber of the drawing furnace, the outer cover of the second vacuum area and the outer cover of the core heating area and used for controlling the air tightness of the first vacuum area, the second vacuum area and the core heating area.
The absolute pressure of the first vacuum area is 0.06-0.2 Mpa; the absolute pressure of the second vacuum area is 0.03-0.06 MPa; the absolute pressure of the core heating area is 0.01-0.04 MPa.
The bottom of the wire drawing furnace body is also provided with a sealing cavity, and the sealing cavity is externally connected with an inert gas source and used for providing inert gas for the graphite piece at the bottom of the core heating area.
The wire drawing furnace body is connected with an external cold source, the external cold source can pump cooling water into the outer shell of the wire drawing furnace body, and the internal and external temperature balance of the wire drawing furnace is kept through the cooling water.
The optical fiber perform rod moves up and down along with the movement of the outer cover of the chamber of the wire drawing furnace in the wire drawing process, and the moving speed is 0.1-5 mm/min.
The optical fiber perform rod adopts a photonic crystal optical fiber perform rod, the outer diameter of the bottom end of the photonic crystal optical fiber perform rod is gradually reduced to form a reducing area, and a plurality of penetrating side holes are formed in the upper end of the photonic crystal optical fiber perform rod; the upper end of the photonic crystal optical fiber perform is positioned in the core heating area, and the reducing area at the bottom end of the photonic crystal optical fiber perform is positioned in the graphite piece.
The ratio of the pressure of the core heating area to the pressure of the inner side hole of the photonic crystal fiber preform is 0.92-0.98; the heating temperature of the reducing region at the bottom end of the photonic crystal optical fiber preform in the graphite piece is 1900-2050 ℃.
Compared with the prior art, the invention has the advantages that:
1. the vacuum wire drawing furnace adopted by the invention is divided into three layers of vacuum pressure control, compared with the traditional wire drawing furnace, the temperature of the core area can reach 1900-2050 ℃, the absolute pressure is 0.01-0.04 Mpa, the uniformity of a temperature field can be effectively improved by the guarantee of the vacuum degree, and meanwhile, the first vacuum area and the second vacuum area are transition areas, so that the stability of the whole vacuum of the wire drawing furnace can be ensured by making corresponding changes according to the pressure changes of the inner cavity and the outer cavity. The vacuum wire drawing furnace can draw various special optical fibers except the traditional optical fiber, such as photonic crystal optical fiber with complex microstructure, rare earth doped special optical fiber and the like.
2. The vacuum wire drawing furnace effectively reduces the wire drawing cost of optical fibers, does not use noble inert gases such as He and Ar in the vacuum wire drawing process or greatly reduces the use of noble inert gases such as He and Ar, and greatly prolongs the life cycle of graphite pieces and heating coils in the wire drawing furnace.
3. The vacuum wire-drawing furnace has the advantages of more optimized structural design, no impurity pollution, good strength of drawn optical fiber, lower attenuation, better roundness, good geometric dimension consistency and the like.
Drawings
FIG. 1 is a schematic view of a vacuum drawing furnace according to the present invention.
FIG. 2 is a cross-sectional top view of the vacuum drawing furnace of the present invention.
Fig. 3 is a control feedback diagram of the wire drawing system of the present invention.
FIG. 4 is a schematic drawing of the wire drawing system of the present invention.
FIG. 5 is a schematic view of a photonic crystal fiber preform according to the present invention.
Fig. 6 is a schematic cross-sectional view of fig. 5.
In the figure, the serial numbers of 1-optical fiber preform, 2-drawing furnace chamber outer cover, 3-drawing furnace body, 4-second vacuum zone outer cover, 5-core heating zone outer cover, 6-heating coil, 7-graphite piece, 8-pulley sealing device, 9-sealing cavity, 101-first vacuum zone, 102-second vacuum zone, 103-core heating zone, 200-photonic crystal optical fiber preform, 201-reducing zone, 202-side hole, 302-annealing furnace, 303-bare fiber tension diameter gauge, 304 cooling tube, 305-auxiliary traction equipment, 306-wet-to-wet coater, 307-curing device, 308-outer diameter gauge, 309-traction device and 310-double-row take-up machine.
Detailed Description
The invention is further illustrated by the following figures and examples.
Referring to fig. 1 and 2, a vacuum drawing furnace for manufacturing an optical fiber comprises an optical fiber preform 1, a drawing furnace chamber housing 2, a drawing furnace body 3, a second vacuum zone housing 4, a core heating zone housing 5, a heating coil 6 and a graphite piece 7; the outer cover 2 of the chamber of the wire drawing furnace is arranged on the outer side of the wire drawing furnace body 3; the second vacuum area outer cover 4 is vertically arranged at the upper part of the wire drawing furnace body 3 and is positioned in the area between the wire drawing furnace chamber outer cover 2 and the wire drawing furnace body 3; the core heating zone outer cover 5 is arranged in the wire drawing furnace body 3 and is arranged from top to bottom along the top of the wire drawing furnace body 3 to the bottom of the wire drawing furnace body 3; a first vacuum area 101 is defined by the chamber outer cover 2 of the wire drawing furnace, the second vacuum area outer cover 4 and the wire drawing furnace body 3; a second vacuum area 102 is defined between the second vacuum area outer cover 4 and the wire drawing furnace body 3; a core heating area 103 is defined between the core heating area outer cover 5 and the wire drawing furnace body 3; the first vacuum area 101, the second vacuum area 102 and the core heating area 103 are respectively externally connected with a vacuum pump, and the vacuum pumps are used for controlling the internal absolute pressure of each area, in the embodiment, the absolute pressure of the first vacuum area 101 is controlled to be 0.06-0.2 Mpa; the absolute pressure of the second vacuum area 102 is controlled to be 0.03-0.06 MPa; the absolute pressure of the core heating area 103 is controlled to be 0.01-0.04 Mpa; the optical fiber perform 1 sequentially passes through the outer cover 2 of the chamber of the drawing furnace, the second vacuum zone 102 and the drawing furnace body 3 and extends into the bottom of the core heating zone 103 in the drawing furnace, a graphite piece 7 is arranged at the bottom of the core heating zone 103, a circle of heating coil 6 is arranged on the upper side of the graphite piece 7 along the circumferential direction of the optical fiber perform 1, and the heating coil 6 heats the optical fiber perform 1 through the graphite piece 7.
Referring to fig. 1, in this embodiment, pulley sealing devices 8 are disposed between the optical fiber preform 1 and the outer cover 2 of the drawing furnace chamber, the outer cover 4 of the second vacuum zone, and the outer cover 5 of the core heating zone, and the pulley sealing devices 8 may be made of high-purity quartz glass or other high-temperature resistant materials, and are used to control the airtightness of the first vacuum zone 101, the second vacuum zone 102, and the core heating zone 103 and prevent a large amount of molecules from leaking.
Referring to fig. 1, in this embodiment, a sealing cavity 9 is further disposed at the bottom of the drawing furnace body 3, the sealing cavity 9 is externally connected with an inert gas source, and supplies an inert gas to the graphite piece 7 at the bottom of the core heating area 103, the lower portion of the graphite piece 7 is porous, a small amount of He and Ar gas is supplemented when the process is required, and during the drawing process, the rare gas is uniformly blown to the graphite piece, so that the rare gas is uniformly filled between the graphite piece and the optical fiber preform, and the temperature field environment of the whole drawing link is maintained.
In this embodiment, wire drawing furnace body 3 be connected with external cold source, external cold source can make progress the shell pump of wire drawing furnace body 3 and go into cooling water, keep wire drawing furnace inside and outside temperature balance through cooling water, keep the wire drawing furnace wholly at lower temperature, the stove outer covering of wire drawing furnace body 3 is fine and close steel material or equivalent material.
In the embodiment, the optical fiber perform rod 1 moves up and down along with the movement of the outer cover 2 of the chamber of the drawing furnace in the drawing process, and the moving speed is 0.1-5 mm/min.
In this embodiment, referring to fig. 5 and fig. 6, the optical fiber preform 1 may adopt a photonic crystal optical fiber preform 200, the photonic crystal optical fiber preform 200 is located at the center of a vacuum drawing furnace, the outer diameter of the bottom end of the photonic crystal optical fiber preform 200 is gradually reduced to form a reducing region 201, and a plurality of penetrating side holes 202 are formed inside the upper end of the photonic crystal optical fiber preform 200; the upper end of the photonic crystal fiber perform 200 is located in the core heating area 103, pressure adjustment is performed on the photonic crystal fiber perform in the core heating area 103, the diameter changing area 201 at the bottom end of the photonic crystal fiber perform 200 is located in the graphite piece 7, the photonic crystal fiber perform is heated through the graphite piece, and the highest heating temperature is 1900-2050 ℃.
Referring to fig. 3 and 4, the wire drawing furnace of the invention is in signal connection with each component of the wire drawing system through a central centralized control system, and the central centralized control system performs feedback control wire drawing with each subsystem of the wire drawing system by controlling parameters such as temperature, pressure and the like of the vacuum wire drawing furnace. The central centralized control system can be controlled by a PLC at present, and because the existing structure of the PLC control system is utilized, the signal transmission mode, the control connection mode and the like of the drawing furnace, the central centralized control system and all parts of the drawing system belong to the prior art, and therefore detailed description is not needed. The drawing system comprises an annealing furnace 302, a bare fiber tension diameter gauge 303, a cooling pipe 304, an auxiliary traction device 305, a wet-to-wet coater 306, a curing device 307, an outer diameter gauge 308, a traction device 309, a double-row wire-rewinding machine 310, a gas line diameter gauge, a twisting device and the like besides the vacuum drawing furnace of the invention.
The specific using process of the invention is as follows:
taking the preparation of a photonic crystal fiber with a complex microstructure as an example, a photonic crystal fiber perform 200 is adopted, the photonic crystal fiber perform 200 is installed at the central position of a vacuum wire drawing furnace, because of the complex structure of the photonic crystal fiber, pressure control needs to be carried out on each side hole 202 of the photonic crystal fiber, the photonic crystal fiber perform is coordinately controlled by a core heating area 103, the ratio of the pressure of the central heating area 103 to the pressure of the side hole 202 of the preform is about 0.92-0.98, a vacuum pump externally connected with the vacuum wire drawing furnace is switched on, the absolute pressures of a first vacuum area 101, a second vacuum area 102 and the core heating area 103 are respectively controlled to be 0.12Mpa, 0.05Mpa and 0.02Mpa, a graphite piece heats a variable diameter area at the bottom of the photonic crystal fiber perform 200, the temperature is 2000 ℃, the photonic crystal fiber perform 200 moves up and down along with the movement of a chamber outer cover, the moving speed is 2.5mm/min, and then the optical fiber manufacturing process is completed through the central control system and other components of the wire drawing system.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (8)
1. A vacuum drawing furnace for the manufacture of optical fibers, comprising an optical fiber preform (1), characterized in that: the wire drawing furnace comprises a wire drawing furnace cavity outer cover (2), a wire drawing furnace body (3), a second vacuum zone outer cover (4), a core heating zone outer cover (5), a heating coil (6) and a graphite piece (7);
the outer cover (2) of the chamber of the wire drawing furnace is arranged on the outer side of the wire drawing furnace body (3); the second vacuum area outer cover (4) is vertically arranged at the upper part of the wire drawing furnace body (3) and is positioned in the area between the wire drawing furnace chamber outer cover (2) and the wire drawing furnace body (3); the core heating zone outer cover (5) is arranged in the wire drawing furnace body (3) and is arranged from top to bottom along the top of the wire drawing furnace body (3) to the bottom of the wire drawing furnace body (3); a first vacuum area (101) is enclosed among the drawing furnace chamber outer cover (2), the second vacuum area outer cover (4) and the drawing furnace body (3); a second vacuum area (102) is enclosed between the second vacuum area outer cover (4) and the wire drawing furnace body (3); a core heating area (103) is defined between the core heating area outer cover (5) and the wire drawing furnace body (3); the first vacuum area (101), the second vacuum area (102) and the core heating area (103) are respectively externally connected with a vacuum pump, and the vacuum pumps are used for controlling the internal absolute pressure of each area; the optical fiber perform rod (1) passes through a drawing furnace chamber outer cover (2), a second vacuum zone (102) and a drawing furnace body (3) in sequence and extends into the bottom of a core heating zone (103) in the drawing furnace, a graphite piece (7) is arranged at the bottom of the core heating zone (103), a circle of heating coil (6) is arranged on the upper side of the graphite piece (7) along the circumferential direction of the optical fiber perform rod (1), and the heating coil (6) heats the optical fiber perform rod (1) through the graphite piece (7).
2. A vacuum draw furnace for optical fiber manufacture according to claim 1, wherein: pulley sealing devices (8) are arranged among the optical fiber preform rod (1), the drawing furnace chamber outer cover (2), the second vacuum zone outer cover (4) and the core heating zone outer cover (5) and are used for controlling the air tightness of the first vacuum zone (101), the second vacuum zone (102) and the core heating zone (103).
3. A vacuum drawing furnace for optical fiber production according to claim 1 or 2, characterized in that: the absolute pressure of the first vacuum area (101) is 0.06-0.2 Mpa; the absolute pressure of the second vacuum area (102) is 0.03-0.06 MPa; the absolute pressure of the core heating area (103) is 0.01-0.04 MPa.
4. A vacuum draw furnace for optical fiber manufacture according to claim 2, wherein: the bottom of the wire drawing furnace body (3) is also provided with a sealing cavity (9), the sealing cavity (9) is externally connected with an inert gas source, and the inert gas is provided for the graphite piece (7) at the bottom of the core heating area (103).
5. A vacuum draw furnace for optical fiber manufacture according to claim 1, wherein: the wire drawing furnace body (3) is connected with an external cold source, the external cold source can pump cooling water into the shell of the wire drawing furnace body (3), and the internal and external temperature of the wire drawing furnace is kept balanced through the cooling water.
6. A vacuum draw furnace for optical fiber manufacture according to claim 1, wherein: the optical fiber perform rod (1) moves up and down along with the movement of the outer cover (2) of the chamber of the wire drawing furnace in the wire drawing process, and the moving speed is 0.1-5 mm/min.
7. The vacuum draw furnace for optical fiber manufacture according to claim 6, wherein: the optical fiber perform rod (1) adopts a photonic crystal optical fiber perform rod (200), the outer diameter of the bottom end of the photonic crystal optical fiber perform rod (200) is gradually reduced to form a reducing area (201), and a plurality of penetrating side holes (202) are formed in the upper end of the photonic crystal optical fiber perform rod (200); the upper end of the photonic crystal fiber preform (200) is positioned in the core heating zone (103), and the reducing zone (201) at the bottom end of the photonic crystal fiber preform (200) is positioned in the graphite part (7).
8. A vacuum draw furnace for optical fiber manufacture according to claim 7, wherein: the ratio of the pressure of the core heating area (103) to the pressure of the inner side hole (202) of the photonic crystal fiber preform is 0.92-0.98; the heating temperature of the reducing region (201) at the bottom end of the photonic crystal fiber preform in the graphite piece (7) is 1900-2050 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020179138.3U CN211896679U (en) | 2020-02-18 | 2020-02-18 | Vacuum wire drawing furnace for manufacturing optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020179138.3U CN211896679U (en) | 2020-02-18 | 2020-02-18 | Vacuum wire drawing furnace for manufacturing optical fiber |
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| CN211896679U true CN211896679U (en) | 2020-11-10 |
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| CN202020179138.3U Expired - Fee Related CN211896679U (en) | 2020-02-18 | 2020-02-18 | Vacuum wire drawing furnace for manufacturing optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111186999A (en) * | 2020-02-18 | 2020-05-22 | 通鼎互联信息股份有限公司 | Vacuum wire drawing furnace for manufacturing optical fiber |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111186999A (en) * | 2020-02-18 | 2020-05-22 | 通鼎互联信息股份有限公司 | Vacuum wire drawing furnace for manufacturing optical fiber |
| CN111186999B (en) * | 2020-02-18 | 2024-03-12 | 通鼎互联信息股份有限公司 | Vacuum drawing furnace for optical fiber manufacturing |
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