CN102649622B - Optical fiber drawing method and wire-drawing frame - Google Patents
Optical fiber drawing method and wire-drawing frame Download PDFInfo
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- CN102649622B CN102649622B CN201110048727.3A CN201110048727A CN102649622B CN 102649622 B CN102649622 B CN 102649622B CN 201110048727 A CN201110048727 A CN 201110048727A CN 102649622 B CN102649622 B CN 102649622B
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Abstract
The invention provides a kind of optical fiber drawing method and wire-drawing frame, the upper space of fibre parent material can be maintained roughly certain by it, from the top supply rare gas element of fibre parent material, utilizes stable air-flow, make optical fiber wire diameter constantization, preparation work is also easy to carry out.In this optical fiber drawing method and wire-drawing frame, be configured to make and assemble rod (2) and be connected and obtain the fibre parent material (1) of suspension strut, by well heater (5), stove core barrel (4), and the inside of the fiber drawing furnace to form with the bobbin (20) that the upper end of stove core barrel links declines, the drawing optical fiber (1a) by fibre parent material (1) heating and melting, in the outside of assembling rod (2), silica tube (22) is configured in the mode be connected with the top of fibre parent material, and this silica tube is declined together with assembling rod (2) and fibre parent material (1), this silica tube has external diameter for+10 ~-20mm poor relative to the external diameter of the external diameter of fibre parent material (1).
Description
Technical field
The present invention relates to a kind of from fibre parent material, draw out optical fiber optical fiber drawing method and wire-drawing frame.
Background technology
Optical fiber by by with quartz be main component fibre parent material heating and melting after carry out wire drawing and manufacture.Fiber drawing furnace fibre parent material being carried out to heating and melting is configured to, and always flows into rare gas element when wire drawing, to prevent stove internal oxidition aging.Along with the carrying out of wire drawing, the position of fiber drawing furnace inner fiber mother metal changes, and thus, distribution and the flowing of rare gas element change, and for drawn optical fiber, produces wire diameter change.
As its countermeasure, such as Suo Shi Fig. 3 (A) (with reference to patent documentation 1), the technology of known following form, that is, arrange packed-piston in the mode of the upper space obturation by fiber drawing furnace, and make it move along with the carrying out of wire drawing.Fibre parent material 1 links with fibre parent material support stick (assembling (dummy) rod) 2, suspension strut in the upper direction stove of fiber drawing furnace.In fiber drawing furnace, utilize the heat of well heater 5, by the lower end heating and melting of the fibre parent material of the state of the movement that declines in stove core barrel 4, and drawing optical fiber 1a.The upper tube place of stove core barrel 4 is provided with multiple gas vent 7, via the gas holding chamber 6 configured in the mode of surrounding outside it, utilizes Gas controller 8 in stove, supply the rare gas element of regulation.
On fibre parent material support stick 2, be configured to by packed-piston 9 in the mode in inaccessible stove internal upper part space, decline movement together with fibre parent material 1.Along with the carrying out of wire drawing, fibre parent material 1 shortens gradually and moves downwards, but utilizes packed-piston 9 that the top in stove is inaccessible, and upper space always keeps certain.Thus, rare gas element is flowed downwards by the gap be formed between stove core barrel 4 and fibre parent material 1, prevents the convection current of gas, and the atmosphere in heating and melting portion also keeps certain.
In addition, as Suo Shi Fig. 3 (B) (with reference to patent documentation 2), the technology of known following form, that is, along with the carrying out of wire drawing, utilize dividing plate to be separated by the upper space of fiber drawing furnace.For this fiber drawing furnace, at the top of stove core barrel 4 configuration inner bobbin 11 and the such double wall tube of outer bobbin 12, the shape of inner bobbin 11 is formed as, and diameter carries out undergauge from top to bottom, links in lower end and stove core barrel 4.Rare gas element supplies in stove from the gas supply port 15 being formed in double wall tube bottom.The assembling rod 2 linked with fibre parent material 1 configures and manyly organize dividing plate 13, its external diameter reduces successively, is positioned on the linking part 3 of assembling excellent 2.
Along with the carrying out of wire drawing, fibre parent material 1 shortens gradually and moves downwards, and assembling rod 2 and linking part 3 also decline movement.Now, if the internal diameter of inner bobbin 11 is consistent with the external diameter of the dividing plate 13 being positioned at topmost, then the mobile of dividing plate of topmost stops and engaging.Next the movement if fibre parent material 1 declines further, be then positioned at the mobile of the dividing plate 13 of topmost and stop and engaging, and then makes many group dividing plates 13 engage across interval in inner bobbin 11 successively.Thus, the upper space of fibre parent material 1 can be kept roughly certain, the flowing of the rare gas element supplied in stove be stablized, reduces the impact on wire drawing.
Patent documentation 1: Japanese Unexamined Patent Publication 2-6349 publication
Patent documentation 2: Japanese Unexamined Patent Publication 11-343137 publication
Summary of the invention
But in the method using the packed-piston shown in Fig. 3 (A), the heavier-weight of packed-piston, the supporting mechanism for suspension strut maximizes, and preparation work is also not easy to carry out.Further, there is following problems, that is, the impact of the dust produced due to the slip between packed-piston and upper tube, makes optical fiber quality decline.
In addition, in the method using the dividing plate shown in Fig. 3 (B), because upper space is separated by dividing plate, so the top supplying opening of rare gas element is arranged near well heater of constructively having to.Thus, the rare gas element supplied in stove core barrel, not by under the heat heating condition comprising the upper side of shoulder of fibre parent material, the heating and melting part to fibre parent material lower end flows into.As noted above, because the gas be not sufficiently heated flows through near heating and melting portion, so make the temperature distribution around fibre parent material chaotic, optical fiber wire diameter may be made to change.
The present invention puts to propose in view of the above problems, its object is to, a kind of optic fibre drawing apparatus and drawing process are provided, the upper space of fibre parent material is maintained roughly certain by it, can from the top supply rare gas element of fibre parent material, with stable air-flow, optical fiber wire diameter is not changed, preparation work also can easily be carried out.
In optical fiber drawing method involved in the present invention and wire-drawing frame, be configured to make and assemble rod and be connected and the fibre parent material that obtains suspension strut, by well heater, stove core barrel and the inside of fiber drawing furnace formed with the bobbin that the upper end of stove core barrel links decline, and by fibre parent material heating and melting drawing optical fiber, it is characterized in that, in the outside of assembling rod, silica tube is configured in the mode be connected with the top of fibre parent material, and this silica tube is declined together with assembling rod and fibre parent material, this silica tube has external diameter for+10 ~-20mm poor relative to the external diameter of the external diameter of fibre parent material.
In addition, be configured with the hitch that can make silica tube movement along the vertical direction, before wire drawing starts, by the top pull-up of silica tube to bobbin, after installing optical fibres mother metal, silica tube declined, and be configured in the top of fibre parent material.
The effect of invention
According to the present invention, because fibre parent material is roughly the same with the diameter of silica tube, decline integratedly movement in stove, so the upper space of fibre parent material can be kept roughly certain.In addition, due to rare gas element can be supplied from the top of fibre parent material, so gas can flow in the mode of the shoulder flowing through the maximum fibre parent material of thermal discharge, its result, the gas atmosphere in heating and melting portion also becomes steady state, can reduce the change of optical fiber wire diameter.In addition, as noted above, process is easy to and lightweight silica tube owing to using in order to the upper space of fibre parent material is kept certain, so such as with use the mode of the Vitrea situation identical with the diameter of fibre parent material and packed-piston as assembling rod compared with, operation becomes easy.
Accompanying drawing explanation
Fig. 1 is the figure that embodiments of the present invention are described.
Fig. 2 is the figure that other embodiment of the present invention is described.
Fig. 3 is the figure that prior art is described.
Embodiment
Utilize Fig. 1, schematic configuration of the present invention is described.Fig. 1 (A) is the figure of the schematic configuration representing fiber drawing furnace, Fig. 1 (B) is the figure representing the state that assembling rod links with fibre parent material.In FIG, 1 represents fibre parent material, and 1a represents optical fiber, and 1b represents department of assembly, 1c represents assembling end, and 1d represents shoulder, and 2 represent assembling rod, and 2a represents support portion, 3 represent linking part, and 4 represent stove core barrel, and 5 represent well heater, and 20 represent bobbin, 21 represent upper cover, and 21a represents communicating pores, and 22 represent silica tube, and 22a represents lower end, 22b represents upper end, and 23 represent lid, and 23a represents communicating pores, 24 represent gas supply port, and 25 represent suspender, and 25a, 25b represent hook portion.
Fiber drawing furnace is by stove core barrel 4, form the well heater 5 heated in stove and the bobbin 20 that is configured in the chimney-like above stove core barrel 4, and be configured to utilize upper cover 21 that the upper end open of bobbin 20 is inaccessible, the supplying opening 24 of rare gas element is set in the upper side of bobbin 20 in addition.For the fibre parent material 1 inserted in stove, utilize linking part 3 will assemble rod 2 (metal or silica glasss) and link with the assembling end 1c of the department of assembly 1b of fibre parent material 1, thus utilization is arranged on the support portion 2a suspension strut of assembling excellent upper end.
The invention is characterized in, in said structure, at the outside configuration silica tube 22 of assembling rod 2.As silica tube 22, preferably there is the external diameter (+10mm ~-20mm) roughly equal with the external diameter of fibre parent material 1.If the external diameter difference of silica tube and fibre parent material becomes large, then make the air-flow of this stage portion office chaotic, therefore, preferably both external diameter differences are located in 20mm degree.But, because the gap between fibre parent material and stove core barrel is formed as 10mm degree, so when the external diameter of silica tube is larger, must control within the diameter+10mm of fibre parent material.
Be provided with the lid 23 of opening obturation at the 22b place, upper end of silica tube 22.Plugging in fitting rod 2 movably in the communicating pores 23a of lid 23 in advance, as shown in Fig. 1 (B), make silica tube 22 mobile to the top (direction of arrow) of assembling rod 2, and assembling rod 2 is linked with the assembling end 1c of the department of assembly 1b of fibre parent material 1.In addition, after fibre parent material 1 and assembling rod 2 are linked, carry out airtight, can not leak from the communicating pores 23a part of lid 23 to make the rare gas element supplied in stove.
Silica tube 22 is from being arranged on support portion 2a suspension strut via the suspenders such as chain 25 of assembling excellent upper end.Suspender 25 is erected at the hook portion 25a that is arranged on lid 23 and is arranged between the hook portion 25b on the 2a of support portion, and its length can adjust, and this lid 23 is arranged on silica tube 22.As noted above, by utilizing the hitches such as suspender to make silica tube move up and down, thus regardless of the size of fibre parent material, silica tube configuration can be gone up in position.In addition, be arranged on the hook portion 25a on the lid 23 of silica tube 22, also can be set directly at the side of the upper end of silica tube 22.
By assembling rod 2 with after fibre parent material 1 links, silica tube 22 is returned to fibre parent material 1 side, and the lower end 22a of silica tube 22 is moved to abut with the shoulder 1d above fibre parent material.In addition, can gap be there is between the shoulder 1d above the lower end 22a and fibre parent material of silica tube 22, also can not exist.To stay in spaced situation, as long as regulate the length of suspender 25, shortened.Then, utilize the support portion 2a of assembling rod 2 to hang with the silica tube 22 assembled on excellent 2 fibre parent materials 1 linked and the shoulder 1d being carried on fibre parent material, and be housed in fiber drawing furnace.This collecting operation is accommodated in the following manner, that is, from be arranged on fiber drawing furnace cylinder portion 20 upper end upper cover 21 communicating pores 21a insert fibre parent material 1 and silica tube 22, and to be suspended in stove.In addition, expect communicating pores 21a airtight in the transportable mode of silica tube 22, to make the rare gas element supplied in stove can not from this partial compromise.
In the wire-drawing frame of formation as noted above, rare gas element supplies from the gas supply port 24 being arranged on bobbin 20 top.On the other hand, the bottom being housed in the fibre parent material 1 in stove is heated by well heater 5, carries out heating and melting and drawing optical fiber 1a from mother metal lower end.Along with the carrying out of the drawing (wire drawing) of optical fiber 1a, fibre parent material 1 declines downwards movement, mother metal length shortens gradually, but because silica tube 22 also declines together with the decline of this fibre parent material 1, so the space of the upper portion of fibre parent material 1, utilize and keep certain by the silica tube 22 of lid 23 obturation, in addition, and the space between bobbin 20 also keeps certain.
Its result, because the rare gas element supplied from gas supply port 24 always supplies in certain spatial volume, so the flowing of gas can not change during wire drawing.In addition, due to rare gas element can be flowed into from top, so the shoulder 1d of rare gas element above the maximum fibre parent material of heat release, after being heated fully along fibre parent material surface, by heating and melting portion, externally discharge from the optical fiber pull-out mouth below fiber drawing furnace.Thus, the temperature of the rare gas element in the heating and melting portion of drawing optical fiber 1a, flow and flowing are stable, and the wire diameter of the optical fiber drawn does not change.In addition, because parts etc. also can not produce friction along with the movement of fibre parent material, so also do not produce dust in the decline of silica tube 22 is moved, the quality caused thus can not be produced and decline.
Fig. 2 is the figure that other embodiment is described.Present embodiment, compared with the embodiment of Fig. 1, has gap between the shoulder 1d above the lower end 22a and fibre parent material of silica tube 22.In the case, in order to make the lower end 22a of silica tube 22 from the shoulder 1d above fibre parent material is outstanding, as long as the length of adjustment suspender 25 and produce the gap of regulation.In addition, in the present embodiment, also the supplying opening 24 of rare gas element can be arranged on the upper portion office of silica tube 22.
According to the structure of above-mentioned Fig. 2, because the lower end 22a of silica tube 22 is separated with the shoulder 1d above fibre parent material, thus silica tube 22 can not with fibre parent material welding, be easy to carry out preparation work when setting up on next mother metal.In addition, due to when the supplying opening 24 of the upper section from being arranged at silica tube 22 as noted above supplies rare gas element, also the shoulder 1d of rare gas element above fibre parent material can be made to be heated fully along fibre parent material surface, so can flow into by the rare gas element after similarly heating to the heating and melting portion in the downstream side of fibre parent material, stable gas atmosphere can be obtained.
In addition, as the embodiment in the embodiment of Fig. 1, the fibre parent material 1 that use external diameter is Φ 95 ~ 100mm, mother metal length is 1500mm, the length of department of assembly is 500mm, the silica tube 22 that configuration external diameter is 100mm, length is 2700mm carries out wire drawing.In addition, use helium as rare gas element, supply with the ratio that 30L/ divides, stove core barrel temperature is set to 2200 DEG C.Optical fiber now wire diameter change be less than in total length ± 0.1 μm.
On the other hand, under the form of dividing plate mode using Fig. 3 (B), after carrying out the wire drawing of fibre parent material in the same manner as described above, the wire diameter change of optical fiber is ± 0.1 ~ 0.2 μm in total length.
Claims (4)
1. an optical fiber drawing method, in the method, be configured to make and assemble rod and be connected and the fibre parent material that obtains suspension strut, declined by well heater, stove core barrel and the inside of fiber drawing furnace that forms with the bobbin that the upper end of described stove core barrel links, and by described fibre parent material heating and melting drawing optical fiber
It is characterized in that,
In the outside of described assembling rod, silica tube is configured in the mode be connected with the top of described fibre parent material, and in drawing process by the communicating pores of the upper end of described bobbin with described silica tube can the mode of movement airtight, can not leak to make the rare gas element from described communicating pores to the internal feed of described fiber drawing furnace, make described silica tube and described assemble rod and fibre parent material decline in stove integratedly, the upper space of described fibre parent material is kept certain, and this silica tube has external diameter for+10 ~-20mm poor relative to the external diameter of the external diameter of described fibre parent material.
2. optical fiber drawing method according to claim 1, is characterized in that,
Before wire drawing starts, by the top pull-up of described silica tube to described bobbin, after the described fibre parent material of installation, described silica tube is declined, and be configured in the top of described fibre parent material.
3. an optic fibre drawing apparatus, it is configured to make and assembles rod and be connected and the fibre parent material that obtains suspension strut, declined by well heater, stove core barrel and the inside of fiber drawing furnace that forms with the bobbin that the upper end of described stove core barrel links, and by described fibre parent material heating and melting drawing optical fiber
It is characterized in that,
In the outside of described assembling rod, silica tube is configured in the mode be connected with the top of described fibre parent material, and in drawing process by the communicating pores of the upper end of described bobbin with described silica tube can the mode of movement airtight, can not leak to make the rare gas element from described communicating pores to the internal feed of described fiber drawing furnace, make described silica tube and described assemble rod and fibre parent material decline in stove integratedly, the upper space of described fibre parent material is kept certain, and this silica tube has external diameter for+10 ~-20mm poor relative to the external diameter of the external diameter of described fibre parent material.
4. optic fibre drawing apparatus according to claim 3, is characterized in that,
Have hitch, it makes described silica tube move along the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110048727.3A CN102649622B (en) | 2011-02-28 | 2011-02-28 | Optical fiber drawing method and wire-drawing frame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110048727.3A CN102649622B (en) | 2011-02-28 | 2011-02-28 | Optical fiber drawing method and wire-drawing frame |
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| Publication Number | Publication Date |
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| CN102649622A CN102649622A (en) | 2012-08-29 |
| CN102649622B true CN102649622B (en) | 2016-03-16 |
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| CN201110048727.3A Active CN102649622B (en) | 2011-02-28 | 2011-02-28 | Optical fiber drawing method and wire-drawing frame |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2017171549A (en) * | 2016-03-25 | 2017-09-28 | 信越化学工業株式会社 | Optical fiber preform contraction processing method, and processing device |
| JP6686706B2 (en) * | 2016-06-01 | 2020-04-22 | 住友電気工業株式会社 | Optical fiber drawing method |
| FI127774B (en) | 2016-09-14 | 2019-02-15 | Rosendahl Nextrom Gmbh | A sealing arrangement in a drawing furnace |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148033A (en) * | 1995-07-05 | 1997-04-23 | 住友电气工业株式会社 | Optical fiber drawing furnace |
| JP2000203869A (en) * | 1998-12-28 | 2000-07-25 | Sumitomo Electric Ind Ltd | Fiber drawing of optical fiber and fiber drawing oven |
| JP2002356344A (en) * | 2001-05-31 | 2002-12-13 | Hitachi Cable Ltd | Method for drawing optical fiber and wire drawing furnace for optical fiber |
| JP2004210621A (en) * | 2003-01-08 | 2004-07-29 | Sumitomo Electric Ind Ltd | Method for drawing optical fiber and device for drawing optical fiber |
| CN101362628A (en) * | 2007-08-10 | 2009-02-11 | 信越化学工业株式会社 | Apparatus for fabricating an optical fiber and method for sealing a drawing furnace |
| CN101746950A (en) * | 2008-12-05 | 2010-06-23 | 株式会社藤仓 | Optical fiber manufacturing apparatus and optical fiber manufacturing method |
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2011
- 2011-02-28 CN CN201110048727.3A patent/CN102649622B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148033A (en) * | 1995-07-05 | 1997-04-23 | 住友电气工业株式会社 | Optical fiber drawing furnace |
| JP2000203869A (en) * | 1998-12-28 | 2000-07-25 | Sumitomo Electric Ind Ltd | Fiber drawing of optical fiber and fiber drawing oven |
| JP2002356344A (en) * | 2001-05-31 | 2002-12-13 | Hitachi Cable Ltd | Method for drawing optical fiber and wire drawing furnace for optical fiber |
| JP2004210621A (en) * | 2003-01-08 | 2004-07-29 | Sumitomo Electric Ind Ltd | Method for drawing optical fiber and device for drawing optical fiber |
| CN101362628A (en) * | 2007-08-10 | 2009-02-11 | 信越化学工业株式会社 | Apparatus for fabricating an optical fiber and method for sealing a drawing furnace |
| CN101746950A (en) * | 2008-12-05 | 2010-06-23 | 株式会社藤仓 | Optical fiber manufacturing apparatus and optical fiber manufacturing method |
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| CN102649622A (en) | 2012-08-29 |
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