CN105271698A - Sectional detachable furnace core tube structure for preparing optical fiber perform - Google Patents
Sectional detachable furnace core tube structure for preparing optical fiber perform Download PDFInfo
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- CN105271698A CN105271698A CN201510745083.1A CN201510745083A CN105271698A CN 105271698 A CN105271698 A CN 105271698A CN 201510745083 A CN201510745083 A CN 201510745083A CN 105271698 A CN105271698 A CN 105271698A
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- silica tube
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
The invention provides a sectional detachable furnace core tube structure for preparing an optical fiber perform. The sectional detachable furnace core tube structure comprises a furnace core tube, a heater and cooling devices, wherein the middle of the furnace core tube is sleeved with the heater, and the upper side and the lower side of the heater are provided with the cooling devices respectively. The furnace core tube is a sectional quartz tube. A sealing part is arranged between every two quartz tube sections which are fixedly connected through a connecting part. Each connecting part is wrapped by a nitrogen cover. Each cooling device comprises two closed semi-annular cooling cover bodies. Each cooling cover body is provided with a water inlet and a water outlet. The corresponding two semi-annular cooling cover bodies are correspondingly arranged at the same height, and are attached to and surround the quartz tube. Due to the fact that the upper cooling device and the lower cooling device are arranged, in the sintering process, the axial temperature gradient inside the furnace core tube is effectively controlled, and sintering is facilitated. When the furnace core tube is cleaned, the furnace core tube can be cleaned after being detached, and therefore the cleaning difficulty is greatly lowered.
Description
Technical field
The invention belongs to preform research and development and manufacturing technology field, especially relate to a kind of sectional type for the preparation of preform detachable stove core barrel structure.
Background technology
The preparation method of preform mainly contains four kinds, improve chemical vapour deposition (MCVD), microwave plasma activation vapour deposition (PCVD), axial chemical vapour deposition (VAD), outside chemical vapor deposition (OVD), first two is called as method in pipe, and latter two is otherwise known as and manages outer method.Have that sedimentation rate is high, material purity requirement is low owing to managing outer method, be convenient to continuous scale operation, the series of advantages such as low cost, therefore the preform manufacturer in the whole world 70% all adopts the outer method of pipe to produce.By the outer legal system of pipe in the process of preform, need, through dehydration, sintering process, to remove the hydroxyl in loosening body and metal ion, and then obtain qualified preform.Therefore, in preform preparation process, one of technology that sintering process is very crucial in being.
The structure of sintering oven has decisive influence to sintering process again.Common sintering oven is made up of well heater and stove core barrel two portions.Wherein, the major function of well heater is for sintering provides suitable warm field, and stove core barrel is then for sintering provides relatively airtight, a clean environment.Because sintering needs higher temperature (being usually greater than 1450 DEG C), include a large amount of hypertoxicity gas (as chlorine) in its process gas simultaneously, and strongly-acid gas (HCl) in dehydration, can be produced, thus require very high to the resistance to elevated temperatures of stove core barrel and resistance to air loss.In order to ensure the resistance to elevated temperatures of stove core barrel, the general import GE of employing or he Li Shi silica tube are that raw material makes stove core barrel.And the resistance to air loss of stove core barrel, usually then adopt unitary design to solve, that is: stove core barrel is processed by one whole quartz glass tube.In process of production, there is following shortcoming in the stove core barrel adopting this design:
1. difficult cleaning.In preform production process, have a small amount of SiO2 particle and drop from loosening body surface, deposit in stove core barrel.Owing to having higher temperature in stove core barrel, lower the temperature simultaneously and easily cause stove core barrel to break, thus the cleaning work of conventional oven core barrel is abnormal difficult.
2. work-ing life is short.At high temperature, the SiO2 particle dropped can be attached to the internal surface of stove core barrel.When the amount gathered larger time, the warm field distribution in stove core barrel may be changed, and then affect the quality of prefabricated rods, at this moment usually will change stove core barrel, easily cause stove core barrel work-ing life to be reduced.
3. maintenance cost is high.Conventional oven core barrel, in the production process of preform, as there is local damage, namely will change whole stove core barrel, causing maintenance cost higher.
Summary of the invention
In view of this, the present invention is intended to propose a kind of sectional type for the preparation of preform detachable stove core barrel structure, solves stove core barrel in prior art and is difficult to cleaning, work-ing life the short and difficult problem that maintenance cost is high.
For achieving the above object, technical scheme of the present invention is achieved in that
Sectional type for the preparation of a preform detachable stove core barrel structure, comprises stove core barrel and to be sheathed in the middle part of stove core barrel the refrigerating unit well heater in outside and the upper and lower both sides of well heater installed respectively; Described stove core barrel is the silica tube of sectional type, is equipped with sealing member between every two sections of silica tubes, and is fixedly connected with by web member between every two sections of silica tubes; Nitrogen cover is enclosed with outside described web member.
Further, described nitrogen cover is provided with inlet mouth and air outlet, its position pressing close to described stove core barrel is provided with opening.
Further, described stove core barrel comprises the identical epimere silica tube of internal-and external diameter, stage casing silica tube and hypomere silica tube; All sealing member is provided with between described epimere silica tube and the end face of stage casing silica tube and between the end face of stage casing silica tube and hypomere silica tube; Described well heater corresponding described stage casing silica tube is arranged.
Further, described sealing member is high-temperature seal ring.
Further, the upper surface of the lower surface of described epimere silica tube, the upper surface of stage casing silica tube, the lower surface of stage casing silica tube and hypomere silica tube is equipped with sealed groove.
Further, the lower surface of described epimere silica tube, the upper surface of stage casing silica tube, the lower surface of stage casing silica tube and the upper surface of hypomere silica tube are equipped with flanging, and described flanging is provided with sealed groove.
Further, described web member comprises upper joint sleeve and is threadedly connected to the lower joint sleeve of upper joint sleeve; Described upper joint sleeve is fixed with top board; Described lower joint sleeve is fixed with press table.
Further, described refrigerating unit comprises two closed semi-circular cooling cover bodies, and each described cooling cover body is equipped with water-in and water outlet; Semi-circular cooling cover body described in two is correspondingly arranged on sustained height, press close to and around described stove core barrel.
Relative to prior art, the present invention has following advantage:
1) the present invention is provided with upper and lower two refrigerating units, in sintering process, effectively can control axial-temperature gradient in stove core barrel, make it to be more conducive to sintering.
2) stove core barrel is made up of the silica tube of sectional type, wherein epimere silica tube and the hypomere silica tube domestic high purity quartz pipe that valency can be adopted low, stage casing silica tube adopts import GE-213 silica tube or congratulates Li Shi silica tube, like this, can reduce the consumption of import GE or he Li Shi silica tube to greatest extent, the cost of manufacture of the stove heart stove made significantly reduces.
3) stove core barrel is detachable segmentation structure, when clearing up stove core barrel, clearing up again, the difficulty of clearing up significantly is reduced, also indirectly adds the work-ing life of stove core barrel simultaneously after stove core barrel can being split.In addition, in the production process of preform, as there is local damage, only need to change the part damaged, the maintenance cost of stove core barrel is significantly reduced, and production efficiency significantly improves.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of refrigerating unit in the present invention;
Fig. 3 is the structural representation of web member in the present invention;
Fig. 4 is that connecting-piece structure of the present invention splits exploded perspective view;
Fig. 5 is the structural representation of nitrogen cover in the embodiment of the present invention.
Description of reference numerals:
1-epimere silica tube, 2-stage casing silica tube, 3-hypomere silica tube, 4-web member, 5-nitrogen cover, 6-well heater, 7-sealing member, 8-refrigerating unit, 9-water-in, 10-water outlet, 11-inlet mouth, 12-air outlet, 13-cools cover body, 14-opening, 15-upper joint sleeve, 16-lower joint sleeve, 17-top board, 18-press table, the left semi-circular cover body of 19-, the right semi-circular cover body of 20-, 21-stove core barrel, 22-flanging.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Sectional type for the preparation of a preform detachable stove core barrel structure, as shown in Fig. 1 to 5, comprises stove core barrel 21 and to be sheathed in the middle part of stove core barrel 21 refrigerating unit 8 well heater 6 in outside and well heater about 6 both sides installed respectively; Described stove core barrel 21 is the silica tube of sectional type, is equipped with sealing member 7 between every two sections of silica tubes, and is fixedly connected with by web member 4 between every two sections of silica tubes; Nitrogen cover 5 is enclosed with outside described web member 4.It should be noted that, high purity graphite circle can be adopted as well heater here, for sintering provides suitable warm field, sintering temperature is generally between 1450-1580 DEG C, and axial-temperature gradient, about 140 DEG C/about cm, can obtain smart metastable control by upper and lower two refrigerating units 8.
Wherein, described nitrogen cover 5 is provided with inlet mouth 11 and air outlet 12, its position pressing close to described stove core barrel 21 is provided with opening 21.Nitrogen cover 5 generally adopts tetrafluoroethylene or titanium alloy material, and the internal diameter 2-10mm more bigger than the external diameter of stove core barrel 21 of nitrogen cover 5, external diameter 20-60mm larger than the external diameter of web member 4, wall thickness is 4-10mm.Inlet mouth 11 and air outlet 12 are generally installed the joint of 1/4 〞 or 3/8 〞.In sintering process, pass into the nitrogen of trace from lower end inlet mouth 11, and discharge from air outlet, upper end 12, the effect of cooling connecting piece 4 and sealing member 7 can be played, and prevent Cl2 from leaking.For the ease of dismounting, nitrogen cover 5 can be the integrated structure of left and right two lobe, as shown in Figure 5, forms 20 by left semi-circular cover body 19 and right semi-circular cover body.
Wherein, described stove core barrel 21 comprises the identical epimere silica tube 1 of internal-and external diameter, stage casing silica tube 2 and hypomere silica tube 3; Sealing member 7 is all provided with between described epimere silica tube 1 and the end face of stage casing silica tube 2 and between the end face of stage casing silica tube 2 and hypomere silica tube 3; Described well heater 6 corresponding described stage casing silica tube 2 is arranged.Epimere silica tube 1, stage casing silica tube 2 are consistent with outside dimension with the internal diameter of hypomere silica tube 3, but the design at material, length and upper and lower end face place is slightly different.The internal diameter of silica tube and length are generally determine according to the diameter of VAD or OVD loosening body and length.The internal diameter generally 20-60m larger than the diameter of loosening body of silica tube, the external diameter 6-15mm larger than internal diameter of silica tube, the total length of three quartz pipes is generally the 2.5-3.5 of the length of loosening body doubly.
Epimere silica tube 1, due to the temperature of bearing relatively low (general <1100 DEG C), thus generally selects domestic pure quartz glass to make.Be designed with a semi-circular recesses at lower surface (or lower surface of the bottom flanging) place of epimere silica tube 1, the degree of depth of groove is 2-6mm, and the external diameter 40-100mm larger than stove core barrel 21 internal diameter of groove, for placing high-temperature seal ring.Because stage casing silica tube 2 is in the process of sintering, need bear higher sintering temperature (usual >1450 DEG C) and can not produce deformation, therefore stage casing silica tube 2 is generally selected import GE or is congratulated Li Shi pure quartz glass and makes.Thereon, lower surface (or lower surface of the upper surface of its top flanging and bottom flanging) place is all designed with a semi-circular recesses, and the degree of depth of groove is 2-6mm, and the diameter 40-100mm larger than stove core barrel internal diameter of groove, for placing high-temperature seal ring.Hypomere silica tube 3 due to the temperature of bearing relatively low, generally select as domestic pure quartz glass makes.Be designed with a semi-circular recesses at upper surface (or upper surface of the top flanging) place of hypomere silica tube 3, the degree of depth of groove is 2-6mm, and the diameter 40-100mm larger than stove core barrel internal diameter of groove, for placing high-temperature seal ring.
Wherein, described sealing member 7 is high-temperature seal ring.Here the preferred fluorine rubber ring of high-temperature seal ring, concrete, the diameter 0.2-0.8mm larger than the groove height on silica tube of fluorine rubber ring, can be under the high temperature conditions, ensure that stove core barrel 21 has good resistance to air loss, prevent Cl2 leakage and the outer impurity of stove core barrel and moisture from entering.
Wherein, the upper surface of the lower surface of described epimere silica tube 1, the upper surface of stage casing silica tube 2, the lower surface of stage casing silica tube 2 and hypomere silica tube 3 is equipped with sealed groove.
Wherein, the lower surface of described epimere silica tube 1, the upper surface of stage casing silica tube 2, the lower surface of stage casing silica tube 2 and the upper surface of hypomere silica tube 3 are equipped with flanging 22, and described flanging 22 is provided with sealed groove.
Wherein, described web member 4 comprises upper joint sleeve 15 and is threadedly connected to the lower joint sleeve 16 of upper joint sleeve 15; Described upper joint sleeve 15 is fixed with top board 17; Described lower joint sleeve 16 is fixed with press table 18.Concrete, the internal diameter 5-20mm larger than silica tube end face external diameter of upper joint sleeve, external diameter 10-40mm larger than internal diameter, its material can select titanium alloy or tetrafluoroethylene.The internal diameter of lower joint sleeve 16 is consistent with the external diameter of upper joint sleeve 15, and external diameter 10-40mm larger than internal diameter, its material can select titanium alloy or tetrafluoroethylene.Top board 17 is the same with the size of press table 18, internal diameter 2-10mm larger than silica tube internal diameter, and external diameter is consistent with the external diameter of upper joint sleeve 15 or lower joint sleeve 16, and its thickness is 5mm-30mm, and its material can select titanium alloy or tetrafluoroethylene.Upper and lower pressing plate can push down the flanging on silica tube by paracentral side.
For the ease of installing, top board 17 can for being divided into left and right two lobes, upper joint sleeve 15 upper surface is connected to respectively by screw (as titanium screw), press table 18 also can be divided into left and right two lobes, is connected to lower joint sleeve 16 lower surface respectively by screw (as titanium screw).During each section of silica tube of stationary furnace core barrel, fixing as epimere silica tube 1 and stage casing silica tube 2, first a upper joint sleeve 15 is sleeved on epimere silica tube 1, lower joint sleeve 16 is sleeved on stage casing silica tube 2, then screw, make the two be threaded togather, make connection, the flanging 22 of epimere silica tube 1 bottom pushed down by top board 17 on 15, make the press table 18 of lower joint sleeve 16 push down the top flanging 22 of stage casing silica tube 2 simultaneously, realize epimere silica tube 1 to be fixedly connected with stage casing silica tube 2, after upper joint sleeve 15 and lower joint sleeve 16 screwed tight, semi-circular recesses high-temperature seal ring can be positioned at by extruding, for stove core barrel provides enough resistance to air loss.
Wherein, described refrigerating unit 8 comprises two closed semi-circular cooling cover bodies 13, and each described cooling cover body 13 is equipped with water-in 9 and water outlet 10; Semi-circular cooling cover body 13 described in two is correspondingly arranged on sustained height, press close to and around described stove core barrel 21.The refrigerating unit of upper end is positioned at the top of sintering oven, and the refrigerating unit of lower end is positioned at the below of stove core barrel 21.Refrigerating unit 8 is made up of the semicircle cavity of two shapes and consistent size, the top and bottom of cavity respectively have one to connect 1/4 〞 or 3/8 〞 interface, wherein the interface of preferred lower end is as water-in 9, the interface of upper end is as water outlet 10, meet the rule that heat transmits, reach better cooling heat dissipation effect.The size of cavity designs according to the size of stove core barrel.Generally, the internal diameter 10-80mm larger than the external diameter of stove core barrel 21 of the cavity of refrigerating unit 8, the external diameter 40-80mm larger than internal diameter of cavity, cavity wall thickness is 5-8mm.Cavity generally selects stainless steel to make, and structural strength is high, favorable anti-corrosion effect.Refrigerating unit can the region, upper and lower of cool furnace core barrel, controls axial-temperature gradient in stove core barrel, makes it to be more conducive to sintering, under guaranteeing that high-temperature seal ring is in suitable working temperature simultaneously, can not exceed its temperature limitation and damage.
Through carrying out continuous seepage to above-mentioned sectional type detachable stove core barrel result on sintering tower, result is followed the tracks of, and the preform produced meets production requirement, and stove core barrel is working properly, and Cl does not occur
2leak.
The present invention is provided with upper and lower two refrigerating units 8, in sintering process, effectively can control axial-temperature gradient in stove core barrel 21, make it to be more conducive to sintering.Because the silica tube of stove core barrel 21 by sectional type is formed, wherein epimere silica tube 1 and the hypomere silica tube 3 domestic high purity quartz pipe that valency can be adopted low, stage casing silica tube 2 adopts import GE-213 silica tube or congratulates Li Shi silica tube, like this, can reduce the consumption of import GE or he Li Shi silica tube to greatest extent, the cost of manufacture of the stove heart stove made significantly reduces.
Stove core barrel 21 is detachable segmentation structure, when clearing up stove core barrel, clearing up again, the difficulty of clearing up significantly is reduced, also indirectly adds the work-ing life of stove core barrel simultaneously after stove core barrel can being split.In addition, in the production process of preform, as there is local damage, only need to change the part damaged, the maintenance cost of stove core barrel is significantly reduced, and production efficiency significantly improves.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. for the preparation of a sectional type detachable stove core barrel structure for preform, it is characterized in that: comprise stove core barrel and to be sheathed in the middle part of stove core barrel the refrigerating unit well heater in outside and the upper and lower both sides of well heater installed respectively; Described stove core barrel is the silica tube of sectional type, is equipped with sealing member between every two sections of silica tubes, and is fixedly connected with by web member between every two sections of silica tubes; Nitrogen cover is enclosed with outside described web member.
2. a kind of sectional type for the preparation of preform according to claim 1 detachable stove core barrel structure, is characterized in that: on described nitrogen cover, be provided with inlet mouth and air outlet, its position pressing close to described stove core barrel is provided with opening.
3. a kind of sectional type for the preparation of preform according to claim 1 detachable stove core barrel structure, is characterized in that: described stove core barrel comprises the identical epimere silica tube of internal-and external diameter, stage casing silica tube and hypomere silica tube; All sealing member is provided with between described epimere silica tube and the end face of stage casing silica tube and between the end face of stage casing silica tube and hypomere silica tube; Described well heater corresponding described stage casing silica tube is arranged.
4. a kind of sectional type for the preparation of the preform detachable stove core barrel structure according to claim 1 or 3, is characterized in that: described sealing member is high-temperature seal ring.
5. a kind of sectional type for the preparation of preform according to claim 3 detachable stove core barrel structure, is characterized in that: the lower surface of described epimere silica tube, the upper surface of stage casing silica tube, the lower surface of stage casing silica tube and the upper surface of hypomere silica tube are equipped with sealed groove.
6. a kind of sectional type for the preparation of preform according to claim 3 detachable stove core barrel structure, it is characterized in that: the lower surface of described epimere silica tube, the upper surface of stage casing silica tube, the lower surface of stage casing silica tube and the upper surface of hypomere silica tube are equipped with flanging, and described flanging is provided with sealed groove.
7. a kind of sectional type for the preparation of preform according to claim 1 detachable stove core barrel structure, is characterized in that: described web member comprises upper joint sleeve and is threadedly connected to the lower joint sleeve of upper joint sleeve; Described upper joint sleeve is fixed with top board; Described lower joint sleeve is fixed with press table.
8. a kind of sectional type for the preparation of preform according to claim 1 detachable stove core barrel structure, it is characterized in that: described refrigerating unit comprises two closed semi-circular cooling cover bodies, and each described cooling cover body is equipped with water-in and water outlet; Semi-circular cooling cover body described in two is correspondingly arranged on sustained height, press close to and around described stove core barrel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510745083.1A CN105271698B (en) | 2015-11-04 | 2015-11-04 | A kind of detachable stove heart tubular construction of segmented for being used to prepare preform |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510745083.1A CN105271698B (en) | 2015-11-04 | 2015-11-04 | A kind of detachable stove heart tubular construction of segmented for being used to prepare preform |
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| CN105271698A true CN105271698A (en) | 2016-01-27 |
| CN105271698B CN105271698B (en) | 2017-11-03 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776842A (en) * | 2016-05-06 | 2016-07-20 | 藤仓烽火光电材料科技有限公司 | Sintering device for manufacturing low-loss optical fiber preform rod and heat exchange method |
| CN107601840A (en) * | 2017-10-31 | 2018-01-19 | 江苏亨通光导新材料有限公司 | Segmented preform sintering furnace device and corresponding optical wand sintering method |
| CN108178501A (en) * | 2018-02-05 | 2018-06-19 | 烽火通信科技股份有限公司 | For the muffle tube and its application method of the sintering of prefabricated rods loosening body |
| CN108409128A (en) * | 2018-05-21 | 2018-08-17 | 青海中利光纤技术有限公司 | Preform sintering stove heart pipe structure |
| CN110193529A (en) * | 2019-06-17 | 2019-09-03 | 中国重型机械研究院股份公司 | A kind of extruder cleaning pad cooling device and its application method |
| CN110776251A (en) * | 2019-12-05 | 2020-02-11 | 江苏亨通光导新材料有限公司 | Furnace core pipe for sintering optical fiber preform rod and replacement method thereof |
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| CN104944758A (en) * | 2014-03-26 | 2015-09-30 | 信越化学工业株式会社 | Sintering apparatus and sintering method for glass preform for optical fiber |
| CN205115283U (en) * | 2015-11-04 | 2016-03-30 | 江苏通鼎光棒有限公司 | A but, sectional type split furnace core tube structure for preparing optical fiber perform |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776842A (en) * | 2016-05-06 | 2016-07-20 | 藤仓烽火光电材料科技有限公司 | Sintering device for manufacturing low-loss optical fiber preform rod and heat exchange method |
| CN107601840A (en) * | 2017-10-31 | 2018-01-19 | 江苏亨通光导新材料有限公司 | Segmented preform sintering furnace device and corresponding optical wand sintering method |
| CN107601840B (en) * | 2017-10-31 | 2020-11-10 | 江苏亨通光导新材料有限公司 | Sectional type optical fiber preform rod sintering furnace device and corresponding optical rod sintering method |
| CN108178501A (en) * | 2018-02-05 | 2018-06-19 | 烽火通信科技股份有限公司 | For the muffle tube and its application method of the sintering of prefabricated rods loosening body |
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| CN108409128A (en) * | 2018-05-21 | 2018-08-17 | 青海中利光纤技术有限公司 | Preform sintering stove heart pipe structure |
| CN108409128B (en) * | 2018-05-21 | 2023-12-01 | 青海中利光纤技术有限公司 | Furnace core tube structure for sintering optical fiber preform |
| CN110193529A (en) * | 2019-06-17 | 2019-09-03 | 中国重型机械研究院股份公司 | A kind of extruder cleaning pad cooling device and its application method |
| CN110193529B (en) * | 2019-06-17 | 2023-12-08 | 中国重型机械研究院股份公司 | Extruder cleaning pad cooling device and application method thereof |
| CN110776251A (en) * | 2019-12-05 | 2020-02-11 | 江苏亨通光导新材料有限公司 | Furnace core pipe for sintering optical fiber preform rod and replacement method thereof |
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| CN105271698B (en) | 2017-11-03 |
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