CN113415988A - Wire drawing furnace for heating and melting glass base material for optical fiber - Google Patents
Wire drawing furnace for heating and melting glass base material for optical fiber Download PDFInfo
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- CN113415988A CN113415988A CN202110964673.9A CN202110964673A CN113415988A CN 113415988 A CN113415988 A CN 113415988A CN 202110964673 A CN202110964673 A CN 202110964673A CN 113415988 A CN113415988 A CN 113415988A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/029—Furnaces therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/61—Recovering, recycling or purifying the inert gas, e.g. helium
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention discloses a drawing furnace for heating and melting glass base material for optical fiber, which comprises: the furnace body structure comprises an outer furnace and a heating furnace core pipe, the heating furnace core pipe is arranged in the outer furnace, and the upper end in the heating furnace core pipe is connected with a heat insulation ring; the sealing and air guiding mechanism comprises an elastic ring cover and a baffle ring, a distance is reserved between the top of the heating furnace core tube and the top wall of the outer furnace, one side of the elastic ring cover is fixedly connected to the top wall of the outer furnace, the baffle ring is connected to the top of the heating furnace core tube, the elastic ring cover is clamped between the baffle ring and the top of the outer furnace, and an air outlet hole is clamped at the bottom of the elastic ring cover; and the rotary exhaust assembly is arranged between the heating furnace core pipe and the baffle ring. The upper opening is sealed in the process of introducing the inert gas, so that the external air is prevented from entering, the original gas is quickly discharged, the content of the inert gas is ensured, and the drawing effect of the optical fiber is ensured.
Description
Technical Field
The invention relates to the technical field of optical fiber drawing, in particular to a drawing furnace for heating and melting glass base metal for optical fibers.
Background
In a drawing process of an optical fiber, a glass tube after the process is fixed, and the bottom end of the glass tube is inserted into a drawing furnace, the optical fiber drawing furnace is configured in such a manner that a furnace core tube for placing a glass base material is arranged in a furnace frame, carbon having high thermal conductivity and made of isotropic graphite or the like is used in the furnace core tube, a heater device for heating the furnace core tube, and a heat insulating material for suppressing heat release to the outside are used. In the process of heating and melting, in order to prevent oxidation of the core tube, a rare gas such as argon (Ar) or helium (He) or nitrogen (N2) is fed into the core tube. In addition, inert gas or the like is also fed into the furnace frame body in order to prevent oxidation of the heat insulator, the furnace core tube or the like.
Because the glass base material needs to enter from the upper end and be led out from the bottom end after drawing, the upper opening and the lower opening of the drawing furnace are both open, inert gas led in order to avoid air oxidation in the drawing process can be transferred to the outside of the drawing furnace in the heating process, so that air enters the drawing furnace, and whether the air in the furnace core pipe is effectively discharged or not can not be ensured, so that the oxidation of the furnace core pipe can be caused, the optical fiber can be shaken, and the drawing effect of the optical fiber can be influenced.
Disclosure of Invention
The invention aims to solve the following defects in the prior art that the upper opening and the lower opening of a drawing furnace are both open, inert gas introduced to avoid air oxidation in the drawing process can be transferred to the outside of the drawing furnace in the heating process to cause air to enter the drawing furnace, and whether the air in a furnace core pipe is effectively discharged or not can not be ensured, so that the oxidation of the furnace core pipe can be caused, an optical fiber can be shaken, and the drawing effect of the optical fiber is influenced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a drawing furnace for heating and melting a glass base material for an optical fiber, comprising:
the furnace body structure comprises an outer furnace and a heating furnace core pipe, the heating furnace core pipe is arranged in the outer furnace, an air inlet cavity is formed between the outer furnace and the heating furnace core pipe, and the upper end in the heating furnace core pipe is fixedly connected with a heat insulation ring;
the sealing gas guide mechanism is used for guiding inert gas in the gas inlet cavity into the heating furnace core tube, the sealing gas guide mechanism comprises an elastic ring cover and a baffle ring, a distance exists between the top of the heating furnace core tube and the top wall of the outer furnace, the section of the elastic ring cover is arc-shaped, one side of the elastic ring cover is fixedly connected to the top wall of the outer furnace, the other side of the elastic ring cover is fixedly connected with the outer side of the heating furnace core tube, the baffle ring is fixedly connected to the top of the heating furnace core tube, the elastic ring cover is clamped between the baffle ring and the top of the outer furnace, a plurality of gas outlet holes are clamped at equal intervals at the bottom of the elastic ring cover, a plurality of gas outlets are equidistantly arranged on the baffle ring and correspond to the gas outlet holes, and when the interior of the elastic ring cover is not inflated, the gas outlet holes and the gas outlets are arranged in a staggered mode;
and the rotary exhaust assembly is arranged between the heating furnace core pipe and the baffle ring, and rotates under the action of the sealing air guide mechanism to cause downward air flow in the heating furnace core pipe 2.
Preferably, one side of the outer furnace is connected with a gas inlet pipe orifice, and the gas inlet pipe orifice is communicated with the gas inlet cavity and used for introducing inert gas.
Preferably, the air outlet is circular, the air outlet is long-strip-shaped, and the width of the air outlet is larger than the diameter of the air outlet.
Preferably, it includes swivel becket, connecting block and runner vane to rotate the exhaust subassembly, the swivel becket passes through the swivel becket rotation and installs in heating stove core pipe upper segment, and is a plurality of connecting block equidistance fixed connection is on the swivel becket inner wall, runner vane side fixed connection is on the connecting block, the runner vane is arc blade, and the level slope sets up.
Preferably, an air guide assembly is connected between the rotary exhaust assembly and the air outlet and comprises an air guide plate and a baffle plate, the air guide plate is fixedly connected to one side of the bottom of the air outlet, the inclined bottom end of the air guide plate is close to the upper end of the runner blade, the baffle plate is fixedly connected to the top of the runner blade and is vertically arranged, and the air guide plate is not in contact with the baffle plate.
Preferably, the rotating assembly comprises a pulley and a chute, the chute is annular and is arranged on the inner wall of the heating furnace core pipe and located on the upper side of the heat insulation ring, and the pulley is rotatably connected to the outer side of the rotating ring and is arranged inside the chute in a sliding mode.
Preferably, the shape of the inner ring of the heat insulation ring is inverted frustum-shaped, and the heat insulation ring is made of high-temperature-resistant materials.
Preferably, the bottom of the heating furnace core pipe is provided with a sealing plate, and the sealing plate is internally provided with an inverted circular truncated cone-shaped notch and is connected with the bottom of the outer furnace through a connecting piece.
Preferably, the connecting piece includes kelly and bayonet socket, and is a plurality of kelly equidistance is connected and is being sealed the board side, and is a plurality of the bayonet socket is L shape, and sets up stove bottom side outside, the kelly card is established inside the bayonet socket, one the outside fixedly connected with handle of kelly.
Compared with the prior art, the invention has the beneficial effects that:
1. the inert gas is introduced into the gas inlet cavity, and the continuously introduced inert gas enters the elastic ring cover to deform the elastic ring cover, so that the glass base material placed in the heating furnace core tube is fixedly clamped, and meanwhile, the joint is sealed, so that the inert gas entering the heating furnace core tube cannot be discharged from the upper part, and meanwhile, the external air is not easy to enter the heating furnace core tube;
2. the in-process that carries out elastic movement at the elasticity ring cover, the venthole coincides with the gas outlet, the inert gas that constantly fills passes through the venthole and the leading-in heating furnace core intraduct of gas outlet, the inside air of heating furnace core intraduct is discharged from the bottom, thereby the inside inert gas's of heating furnace core content has been guaranteed, avoid the emergence of oxidation, the inert gas that jets out simultaneously drives and rotates exhaust subassembly and rotate, the inside air flow of heating furnace core has been accelerated, with the inside original air of heating furnace core quick discharge, inert gas's content has been guaranteed, the wire drawing effect of optic fibre has been guaranteed.
Drawings
FIG. 1 is a schematic front view of a drawing furnace for heating and melting a glass base material for an optical fiber according to the present invention;
FIG. 2 is a schematic view showing an internal structure of a drawing furnace for heating and melting a glass base material for an optical fiber according to the present invention;
FIG. 3 is a schematic view showing the internal plan view of a drawing furnace for heating and melting a glass base material for an optical fiber according to the present invention;
FIG. 4 is a schematic view of the internal structure of a drawing furnace for heating and melting a glass base material for an optical fiber according to the present invention;
FIG. 5 is a view of a rotary exhaust unit of a drawing furnace for heating and melting a glass base material for an optical fiber according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1 to 5, a drawing furnace for heating and melting a glass base material for an optical fiber includes:
the furnace body structure comprises an outer furnace 1 and a heating furnace core pipe 2, wherein the heating furnace core pipe 2 is arranged inside the outer furnace 1, an air inlet cavity is formed between the outer furnace 1 and the heating furnace core pipe 2, the heating furnace core pipe 2 is used for heating and melting glass base materials, and the upper end inside the heating furnace core pipe 2 is fixedly connected with a heat insulation ring 3;
the sealing gas guide mechanism 4 is used for guiding inert gas in the gas inlet cavity into the heating furnace core tube 2, the sealing gas guide mechanism 4 comprises an elastic ring cover 41 and a baffle ring 42, a space exists between the top of the heating furnace core tube 2 and the top wall of the outer furnace 1, the section of the elastic ring cover 41 is arc-shaped, one side of the elastic ring cover is fixedly connected to the top wall of the outer furnace 1, the other side of the elastic ring cover is fixedly connected with the outer side of the heating furnace core tube 2, the baffle ring 42 made of high-temperature-resistant elastic material is fixedly connected to the top of the heating furnace core tube 2, the elastic ring cover 41 is clamped between the baffle ring 42 and the top of the outer furnace 1, a plurality of gas outlet holes 43 are clamped at the bottom of the elastic ring cover 41 at equal intervals, a plurality of gas outlets 44 are arranged at equal intervals on the baffle ring 42 and correspond to the gas outlet holes 43, and when the interior of the elastic ring cover 41 is not inflated, the gas outlet holes 43 and the gas outlets 44 are arranged in a staggered mode;
the rotary exhaust assembly 5 is installed between the heating furnace core tube 2 and the baffle ring 42, and is rotated by the sealing air guide mechanism 4 to cause downward air flow inside the heating filter element.
In the invention, inert gas is introduced into the air inlet cavity, the continuously introduced inert gas enters the elastic ring cover 41 to deform the elastic ring cover 41, the elastic ring cover 41 expands towards the center of a circle, glass base material arranged in the heating furnace core tube 2 is fixedly clamped, and the joint is sealed, so that the inert gas entering the heating furnace core tube 2 cannot be discharged from the upper part, meanwhile, external air is not easy to enter the heating furnace core tube 2, the air outlet hole 43 is overlapped with the air outlet 44 in the elastic movement process of the elastic ring cover 41, the continuously introduced inert gas is introduced into the heating furnace core tube 2 through the air outlet hole 43 and the air outlet 44 to discharge the air in the heating furnace core tube 2 from the bottom, thereby ensuring the content of the inert gas in the heating furnace core tube 2, avoiding oxidation, and meanwhile, the injected inert gas drives the rotary exhaust component 5 to rotate, the invention accelerates the air flow in the heating furnace core pipe 2 and quickly discharges the original air in the heating furnace core pipe 2, seals the upper opening in the process of introducing the inert gas, avoids the external air from entering, accelerates the discharge of the original gas in the heating furnace core pipe 2, ensures the content of the inert gas and ensures the drawing effect of the optical fiber.
According to the preferable technical scheme in the embodiment, one side of the outer furnace 1 is connected with an air inlet pipe orifice 6, and the air inlet pipe orifice 6 is communicated with the air inlet cavity and used for introducing inert gas;
the air outlet 43 is circular, the air outlet 44 is elongated, the width of the air outlet is larger than the diameter of the air outlet 43, the air outlet 43 moves along with the elastic ring cover 41 in the inflation and expansion process of the elastic ring cover 41, when the elastic ring cover 41 reaches a certain degree, the air outlet 43 is not overlapped with the air outlet 44, the continuous expansion of the elastic ring cover 41 is ensured, and when the elastic ring cover 41 moves to a certain degree, the air outlet 43 is overlapped with the corresponding air outlet 44, so that the inert gas continuously filled into the elastic ring cover 41 is discharged from the air outlet 43 and the air outlet 44 and enters the inside of the heating furnace core tube 2;
the rotary exhaust assembly 5 comprises a rotary ring 51, connecting blocks 52 and rotary vanes 53, the rotary ring 51 is rotatably mounted on the upper section of the heating furnace core tube 2 through a rotary assembly 8, the connecting blocks 52 are fixedly connected on the inner wall of the rotary ring 51 at equal intervals, the side edges of the rotary vanes 53 are fixedly connected on the connecting blocks 52, the rotary vanes 53 are arc-shaped blades and are horizontally arranged in an inclined manner, due to the changing effect of the aperture of the inert gas passing through the gas outlet 43, when the inert gas is exhausted, the inert gas is in an injection state, the inert gas with impact force acts on the rotary vanes 53, so that the rotary ring 51 connected with the rotary vanes 53 rotates, the rotary vanes 53 generate downward air flow in the rotating process, the transfer of the air in the heating furnace core tube 2 is accelerated, and the content of the inert gas in the heating furnace core tube 2 is ensured;
an air guide assembly 7 is connected between the rotary exhaust assembly 5 and the air outlet 44, the air guide assembly 7 comprises an air guide plate 71 and a baffle plate 72, the air guide plate 71 is fixedly connected to one side of the bottom of the air outlet 44, the inclined bottom end of the air guide plate is close to the upper end of the rotary vane 53, the baffle plate 72 is fixedly connected to the top of the rotary vane 53 and is vertically arranged, the air guide plate 71 is not in contact with the baffle plate 72, in order to ensure the rotating effect of the rotary exhaust assembly 5, the sprayed inert gas is guided, and meanwhile, the baffle plate 72 can bear the impact action of the inert gas to the maximum extent, so that the rotation of the rotary vane 53;
the rotating assembly 8 comprises pulleys 81 and a chute, the chute is annular and is arranged on the inner wall of the heating furnace core pipe 2 and is positioned on the upper side of the heat insulation ring 3, the pulleys 81 are rotatably connected to the outer side of the rotating ring 51 and are arranged in the chute in a sliding manner, in order to ensure that the rotating of the rotating wheel blades 53 causes the generation of air flow, the generation of friction force needs to be reduced as much as possible in the rotating process, and the pulleys 81 rotate in the chute by adopting the rotating friction with small friction force, so that the rotating ring 51 is driven to rotate;
the shape of the inner ring of the heat insulation ring 3 is inverted circular truncated cone, the heat insulation ring 3 is made of high-temperature-resistant materials, and in order to ensure that air flows to discharge air in the heating furnace core pipe 2, the inner ring of the heat insulation ring 3 needs to be arranged obliquely, so that the flow of the air is ensured;
the bottom of the heating furnace core tube 2 is provided with a sealing plate 9, the sealing plate 9 is internally provided with an inverted circular truncated cone-shaped notch and is connected with the bottom of the outer furnace 1 through a connecting piece, the sealing plate 9 is a structure used in the middle section of the wire drawing process, the glass base material generates dead weight through a glass ball at the bottom, after the glass base material is drawn by cutting, the wire drawing end penetrates through the sealing plate 9 by cutting, the sealing plate 9 is used for sealing the bottom of the heating furnace core tube 2, and the external air is prevented from entering the heating furnace core tube 2 from the bottom;
the connecting piece includes kelly 10 and bayonet socket 11, a plurality of kellies 10 equidistance are connected and are being sealed board 9 sides, a plurality of bayonet sockets 11 are L shape, and set up at outer 1 bottom sides of stove, kelly 10 blocks and establish inside bayonet socket 11, the outside fixedly connected with handle 12 of kelly 10, carry handle 12 and remove the position of sealing board 9, get into kelly 10 from bayonet socket 11 bottom, establish inside bayonet socket 11 with kelly 10 card through rotating, thereby seal the rigidity of board 9, play sealed effect to heating furnace core pipe 2 bottoms.
Claims (9)
1. A drawing furnace for heating and melting a glass base material for an optical fiber, comprising:
the furnace body structure comprises an outer furnace (1) and a heating furnace core pipe (2), wherein the heating furnace core pipe (2) is arranged inside the outer furnace (1), an air inlet cavity is formed between the outer furnace (1) and the heating furnace core pipe (2), and the upper end inside the heating furnace core pipe (2) is fixedly connected with a heat insulation ring (3);
sealed air guide mechanism (4), sealed air guide mechanism (4) are used for with the leading-in heating furnace core pipe (2) of the inside inert gas of chamber of admitting air inside, sealed air guide mechanism (4) are including elasticity ring cover (41) and keep off ring (42), there is the interval between heating furnace core pipe (2) top and outer furnace (1) roof, elasticity ring cover (41) cross-section is the arc, and one side fixed connection is at outer furnace (1) roof, opposite side and heating furnace core pipe (2) outside fixed connection, keep off ring (42) fixed connection at heating furnace core pipe (2) top, and elasticity ring cover (41) card is established between keeping off ring (42) and outer furnace (1) top, elasticity ring cover (41) bottom equidistance card is equipped with a plurality of ventholes (43), keep off ring (42) equidistance and seted up a plurality of gas outlets (44), and to corresponding with venthole (43), when the interior of the elastic ring cover (41) is not inflated, the air outlet holes (43) and the air outlet holes (44) are arranged in a staggered manner;
and the rotary exhaust assembly (5) is arranged between the heating furnace core pipe (2) and the baffle ring (42), and is rotated under the action of the sealing air guide mechanism (4) to cause downward air flow in the heating furnace core pipe (2).
2. The drawing furnace for heating and melting a glass base material for an optical fiber according to claim 1, wherein an air inlet nozzle (6) is connected to one side of the outer furnace (1), and the air inlet nozzle (6) is communicated with an air inlet chamber for introducing an inert gas.
3. The drawing furnace for heating and melting a glass base material for an optical fiber according to claim 1, wherein the gas outlet hole (43) is circular, and the gas outlet (44) is elongated and has a width larger than a diameter of the gas outlet hole (43).
4. The drawing furnace for heating and melting a glass base material for an optical fiber according to claim 1, wherein the rotary exhaust assembly (5) comprises a rotary ring (51), a connecting block (52) and a rotary blade (53), the rotary ring (51) is rotatably mounted on the upper section of the heating furnace core tube (2) through a rotary assembly (8), the connecting blocks (52) are fixedly connected to the inner wall of the rotary ring (51) at equal intervals, the side edge of the rotary blade (53) is fixedly connected to the connecting block (52), and the rotary blade (53) is an arc-shaped blade and is horizontally arranged in an inclined manner.
5. The drawing furnace for heating and melting a glass base material for an optical fiber according to claim 4, wherein an air guide member (7) is connected between the rotary exhaust member (5) and the air outlet (44), the air guide member (7) comprises an air guide plate (71) and a baffle plate (72), the air guide plate (71) is fixedly connected to one side of the bottom of the air outlet (44), the inclined bottom end of the air guide plate is close to the upper end of the rotary vane (53), the baffle plate (72) is fixedly connected to the top of the rotary vane (53) and is vertically arranged, and the air guide plate (71) is not in contact with the baffle plate (72).
6. The drawing furnace for heating and melting a glass base material for an optical fiber according to claim 4, wherein the rotating unit (8) includes a ring-shaped pulley (81) and a chute provided on an inner wall of the heating furnace core tube (2) at an upper side of the heat insulating ring (3), and the plurality of pulleys (81) are rotatably connected to an outer side of the rotating ring (51) and slidably provided inside the chute.
7. The drawing furnace for heating and melting a glass base material for an optical fiber according to claim 1, wherein the shape of the inner ring of the heat insulating ring (3) is rounded in a truncated cone shape, and the heat insulating ring (3) is made of a high temperature resistant material.
8. The drawing furnace for heating and melting a glass base material for an optical fiber according to claim 1, wherein a sealing plate (9) is attached to the bottom of the heating core tube (2), and the sealing plate (9) is provided with an inverted truncated cone-shaped notch therein and is connected to the bottom of the outer furnace (1) by a connecting member.
9. The drawing furnace for heating and melting a glass base material for an optical fiber according to claim 8, wherein the connecting member includes a plurality of bayonet bars (10) and a plurality of bayonets (11), the plurality of bayonet bars (10) are equidistantly connected to a side of the sealing plate (9), the plurality of bayonets (11) are L-shaped and are formed on a bottom side of the outer furnace (1), the bayonet bars (10) are engaged with the bayonets (11), and a handle (12) is fixedly connected to an outer portion of one of the bayonet bars (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110964673.9A CN113415988B (en) | 2021-08-23 | 2021-08-23 | Wire drawing furnace for heating and melting glass base material for optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110964673.9A CN113415988B (en) | 2021-08-23 | 2021-08-23 | Wire drawing furnace for heating and melting glass base material for optical fiber |
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| Publication Number | Publication Date |
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| CN113415988A true CN113415988A (en) | 2021-09-21 |
| CN113415988B CN113415988B (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN1720200A (en) * | 2002-12-05 | 2006-01-11 | 奈克斯特罗姆·霍尔丁公司 | Method and apparatus for making optical fibres |
| CN101805118A (en) * | 2009-02-17 | 2010-08-18 | 信越化学工业株式会社 | Containment member |
| CN203319858U (en) * | 2013-07-05 | 2013-12-04 | 江苏法尔胜光子有限公司 | Optical fiber drawing furnace |
| CN203530137U (en) * | 2013-11-05 | 2014-04-09 | 长飞光纤光缆股份有限公司 | Telescopic sealing device for fiber drawing furnace |
| CN104445911A (en) * | 2007-07-24 | 2015-03-25 | 信越化学工业株式会社 | Furnace |
| CN104981438A (en) * | 2013-01-24 | 2015-10-14 | 住友电气工业株式会社 | Seal structure for optical fiber drawing furnace and optical fiber drawing method |
| CN109689583A (en) * | 2016-09-07 | 2019-04-26 | 住友电气工业株式会社 | Optical fiber drawing method and wire-drawing frame |
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2021
- 2021-08-23 CN CN202110964673.9A patent/CN113415988B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1720200A (en) * | 2002-12-05 | 2006-01-11 | 奈克斯特罗姆·霍尔丁公司 | Method and apparatus for making optical fibres |
| CN104445911A (en) * | 2007-07-24 | 2015-03-25 | 信越化学工业株式会社 | Furnace |
| CN101805118A (en) * | 2009-02-17 | 2010-08-18 | 信越化学工业株式会社 | Containment member |
| CN104981438A (en) * | 2013-01-24 | 2015-10-14 | 住友电气工业株式会社 | Seal structure for optical fiber drawing furnace and optical fiber drawing method |
| CN203319858U (en) * | 2013-07-05 | 2013-12-04 | 江苏法尔胜光子有限公司 | Optical fiber drawing furnace |
| CN203530137U (en) * | 2013-11-05 | 2014-04-09 | 长飞光纤光缆股份有限公司 | Telescopic sealing device for fiber drawing furnace |
| CN109689583A (en) * | 2016-09-07 | 2019-04-26 | 住友电气工业株式会社 | Optical fiber drawing method and wire-drawing frame |
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| CN113415988B (en) | 2021-11-16 |
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Effective date of registration: 20220314 Address after: 226100 No. 38 Zhonghua East Road, three Factory Street, Haimen City, Nantong, Jiangsu Patentee after: Nantong an art design Co.,Ltd. Address before: 226100 No. 6, No. 49, Xinye Road, Sanchang street, Haimen District, Nantong City, Jiangsu Province Patentee before: Nantong Yurong e-commerce Co.,Ltd. |