WO2019153473A1 - 光纤拉丝退火装置及光纤 - Google Patents

光纤拉丝退火装置及光纤 Download PDF

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Publication number
WO2019153473A1
WO2019153473A1 PCT/CN2018/081564 CN2018081564W WO2019153473A1 WO 2019153473 A1 WO2019153473 A1 WO 2019153473A1 CN 2018081564 W CN2018081564 W CN 2018081564W WO 2019153473 A1 WO2019153473 A1 WO 2019153473A1
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WIPO (PCT)
Prior art keywords
annealing
tube
optical fiber
inert gas
blowing portion
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PCT/CN2018/081564
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English (en)
French (fr)
Inventor
刘成
龚成
陈宏达
沈婷
沈威焘
霍荣佳
邱永龙
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Jiangsu Fuchunjiang Photoelectric Ltd Co
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Jiangsu Fuchunjiang Photoelectric Ltd Co
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Classifications

    • 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
    • C03B37/10—Non-chemical treatment
    • 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
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C03B37/02718—Thermal treatment of the fibre during the drawing process, e.g. cooling
    • C03B37/02727—Annealing or re-heating
    • 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
    • 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
    • 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

Definitions

  • the invention relates to an optical fiber production device, in particular to an optical fiber drawing annealing device and an optical fiber.
  • the domestic fiber drawing process is basically stable.
  • the length of the temperature field of the usual wire drawing annealing device is short and the minimum temperature in the temperature field is high.
  • the annealing device disclosed in the patent application No. CN106019465A has an inert gas entering from above the drawing furnace. During the downward flow of the inert gas, the temperature of the gas is getting higher and higher, so that the temperature of the temperature field is not gradually decreased from the top to the bottom, the length of the temperature field is short, and the lowest temperature in the temperature field is high, and the fiber is annealed. The temperature at the tube is still kept high.
  • an optical fiber drawing annealing device comprising a drawing furnace, a fixed annealing tube connected under the drawing furnace, further comprising a sealing connection under the fixed annealing tube for extending a moving annealing tube for annealing the temperature field and a driving portion for driving the moving annealing tube
  • the moving annealing tube comprising an outer tube, a graphite inner bush fixedly mounted in the outer tube, and being mounted at a lower end of the outer tube a first blowing portion for supplying an inert gas to the moving annealing tube, wherein the first blowing portion includes a casing, a flow guiding block installed in the casing, and the guiding block is provided with the The inert gas supplies the upper and lower flow channels to the upper and lower ends of the moving annealing tube.
  • the driving portion includes a screw driving mechanism including a screw and a screw and a nut on the screw, the driving mechanism further includes a nut connected to the screw mechanism and the The connection between the outer tubes.
  • the connecting member includes a first link and a second link that are rotatably connected and lockable, and the first link and the second link respectively correspond to the outer tube and the nut
  • the connection is rotated, and the first link and the outer tube, the second link, and the nut are respectively fixed in relative positions by a lock pin.
  • a second blowing portion is disposed under the drawing furnace, and the density of the inert gas blown into the second blowing portion is greater than the density of the inert gas blown into the first blowing portion.
  • the flow rate of the inert gas in the upper flow guiding channel is greater than the flow rate of the inert gas in the lower flow guiding channel.
  • the angle between the upper guiding channel and the axis of the graphite inner liner is 20°-40°.
  • the angle between the lower flow guiding channel and the axis of the graphite inner bushing is 40° to 60°.
  • the bottom cover of the outer casing is provided with a through hole of the optical fiber
  • the lower end of the first blowing portion is provided with a shutter for controlling the size of the airflow in the moving annealing tube and the fixed annealing tube
  • the shutter comprises rotating with the lower end of the outer casing
  • the valve piece is connected and rotated to adjust the size of the passage through the hole, the rotation axis of the valve piece being perpendicular to the bottom cover.
  • the present invention also provides an optical fiber produced by the above-described fiber drawing annealing apparatus.
  • the present invention has the following advantages compared with the prior art: the moving annealing tube of the present invention adjusts the position by the driving portion, determines whether to install according to the requirements of various optical fibers, and installs a movement under the fixed annealing tube.
  • the annealing tube can extend the length of the temperature field, and the first blowing portion is disposed under the moving annealing tube, and the density of the inert gas outputted by the first blowing portion is smaller than the density of the inert gas outputted by the second blowing portion, so the first blowing portion
  • the inert gas output from the part can rise upwards in the ascending process until it reaches the nozzle of the drawing furnace to form a uniform temperature field with a uniform temperature and a longer temperature.
  • the rising gas will be simultaneously in the drawing furnace and the fixed annealing tube.
  • the silicon carbide is blown into the exhaust gas collecting plate of the furnace mouth of the drawing furnace. Reducing the internal stress of the fiber to reduce microcracks and finally reducing the fiber attenuation.
  • the silicon carbide deposited in the drawing furnace and the annealing nozzle can be collected in the exhaust gas collecting plate of the drawing furnace mouth by the lower blowing air, thereby effectively improving the strength and drawing of the fiber. effectiveness.
  • Figure 1 is a schematic view showing the structure of an annealing device
  • Figure 2 is a schematic view showing the structure of the first blowing portion
  • Figure 3 is a schematic view showing the structure of the shutter.
  • the fiber drawing annealing device comprises a drawing furnace, a fixed annealing tube 5 connected to the lower part of the drawing furnace, and a moving annealing tube 6 sealed and connected under the fixed annealing tube 5 for extending the annealing temperature field, for driving
  • the driving portion on which the moving annealing tube 6 moves is attached to the barometer 7 on the fixed annealing tube 5 and the oxygen analyzer 8 attached to the moving annealing tube.
  • the moving annealing tube 6 includes an outer tube 12, a graphite inner liner 11 fixedly mounted in the outer tube 12, and a first portion mounted on the lower end portion of the outer tube 12 and supplying an inert gas to the moving annealing tube 6.
  • a second blowing portion is disposed under the drawing furnace (the drawing furnace and the second blowing portion are both prior art and will not be described herein), and the density of the inert gas blown into the second blowing portion is greater than that of the second blowing portion.
  • the density of the inert gas blown into the blowing portion 9.
  • the flow rate of the inert gas in the upper flow guiding passage 15 is larger than the flow rate of the inert gas in the lower flow guiding passage 16.
  • the angle between the upper guide passage 15 and the axis of the graphite inner liner 11 is 20 to 40.
  • the angle between the lower flow guiding passage 16 and the axis of the graphite inner liner 11 is 40 to 60.
  • the upper flow guiding channel 15 and the lower guiding flow channel 16 are respectively formed by a plurality of strips uniformly distributed around the axis of the graphite inner liner 11 , and an outer flow path is formed between the outer casing 13 and the flow guiding block 14 , and The upper flow guiding passage 15 communicates with the lower flow guiding passage 16, and the side wall of the outer casing 13 is provided with an air inlet.
  • the bottom cover of the outer casing 13 is provided with a through hole of the optical fiber, and the lower end of the first blowing portion 9 is provided with a shutter for controlling the size of the airflow in the moving annealing tube 6 and the fixed annealing tube 5, as shown in FIG.
  • a valve plate 10 is provided that is rotatably coupled to the lower end of the outer casing 13 and that is rotated to adjust the size of the through hole, the shaft of the valve plate 10 being perpendicular to the bottom cover.
  • the valve plate 10 has two pieces and is disposed symmetrically. The valve piece 10 is respectively provided with a semicircular notch. After the two valve pieces 10 are closed, the two semicircular notches are closed to form a center through hole.
  • the drive portion includes a screw drive mechanism including a screw 1 and a threaded connection with a nut 2 on the screw 1, the drive mechanism further comprising a nut 2 and a joint connected to the screw mechanism
  • the connections between the outer tubes 12 are described.
  • the connecting member includes a first link 3 and a second link 4 that are rotatably connected and lockable, the first link 3 and the second link 4 respectively and the outer tube 12 and the
  • the nut 2 is rotationally coupled, and the first link 3 and the outer tube 12, the second link 4, and the nut 2 are respectively fixed in relative positions by a lock pin.
  • the working principle of the invention is as follows: firstly, the moving annealing tube is sent to the vicinity of the lower portion of the fixed annealing tube by the driving portion, finely adjusted by the connecting member, the moving annealing tube is moved directly under the fixed annealing tube, the connecting member is locked, and then the screw is rotated. The moving annealing tube is driven upward and the fixed annealing tube is sealed and spliced, and then the drawing furnace can start working. At the same time, the second blowing portion and the first blowing portion work to form a uniform and significant cooling temperature, and the length is longer.
  • the rising gas simultaneously blows the silicon carbide in the drawing furnace and the fixed annealing tube into the exhaust gas collecting plate of the furnace mouth of the drawing furnace. Reducing the internal stress of the fiber, reducing the microcrack, and finally reducing the fiber attenuation.
  • the attenuation of the fiber produced by the above-mentioned wire drawing furnace is low, and the silicon carbide deposited in the drawing furnace and the annealing nozzle can be collected at the wire drawing furnace by the lower blowing. In the exhaust gas collection board, the fiber strength and the drawing efficiency are effectively improved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

一种光纤拉丝退火装置及光纤，它包括拉丝炉、固定退火管（5）、移动退火管（6）以及用于带动移动退火管（6）移动的驱动部，移动退火管（6）包括外管（12）、固定安装于外管（12）内的石墨内衬套（11）以及安装于外管（12）下端部上且向移动退火管（6）内供惰性气体的第一吹气部（9），第一吹气部（9）包括外壳（13）、安装于外壳（13）内的导流块（14），导流块（14）上设有分别将惰性气体向移动退火管（6）上端和下端输送的上导流通道（15）和下导流通道（16）。在降低光纤内应力减少微裂纹最终降低光纤衰减的同时还可以通过下吹气使拉丝炉内以及退火管口沉积的碳化硅搜集在拉丝炉口的废气搜集板内，有效的提高光纤强度和拉丝效率。

Description

光纤拉丝退火装置及光纤
技术领域
本发明涉及光纤生产设备，特别涉及一种光纤拉丝退火装置及光纤。
背景技术
现今国内光纤拉丝工艺基本稳定，通常的拉丝退火装置温场的长度较短而且温场内最低温度较高，如公开号为CN106019465A的专利申请所公开的退火装置，其惰性气体从拉丝炉上方进入，在惰性气体下行过程中，气体的温度越来越高，使得温场的温度不是从上往下逐渐降低的情况，温场的长度较短而且温场内最低温度较高，在光纤出退火管时的温度依旧保持得较高。但是迫于社会对长距离大通信容量的通讯要求，光纤拉丝厂家对拉丝工艺进行了进一步优化来降低光纤衰减。最根本的办法是减少光纤内应力来减少微裂纹。很多厂家都想到对光纤充分退火减少内应力来减少表面微裂纹。还有些厂家是在退火管下加装退火炉，这样有两个弊端：1.安装的退火炉占空间。2.退火炉要加热浪费电能。
发明内容
本发明的目的是提供一种节能方便并使光纤充分退火光纤拉丝退火装置。
为达到上述目的，本发明采用的技术方案是：一种光纤拉丝退火装置，它包括拉丝炉、连接于拉丝炉下方的固定退火管，它还包括密封连接于所述固定退火管下方用于延长退火温场的移动退火管以及用于带动所述移动退火管移动的驱动部，所述移动退火管包括外管、固定安装于所述外管内的石墨内衬套以及安装于所述外管下端部上且向移动退火管内供惰性气体的第一吹气部，所述第一吹气部包括外壳、安装于所述外壳内的导流块，所述导流块上设有分别将所述惰性气体向移动退火管上端和下端输送的上导流通道和下导流通道。
优化的，所述驱动部包括丝杆驱动机构，所述丝杆驱动机构包括螺杆和螺纹连接与所述螺杆上的螺母，所述驱动机构还包括连接于所述丝杆机构的螺母和所述外管之间的连接件。
进一步地，所述连接件包括相转动连接且能锁紧的第一连杆和第二连杆，所述第一连杆和所述第二连杆分别与所述外管和所述螺母相转动连接，并且所述第一连杆和所述外管、所述第二连杆和所述螺母分别通过锁销固定相对位置。
优化的，所述拉丝炉下方设有第二吹气部，所述第二吹气部吹入的惰性气体的密度大于第一吹气部吹入的惰性气体密度。
优化的，所述上导流通道内的惰性气体的流量大于下导流通道内的惰性气体的流量。
优化的，所述上导流通道与所述石墨内衬套的轴线的夹角为20°～40°。
优化的，所述下导流通道与所述石墨内衬套的轴线的夹角为40°～60°。
优化的，外壳的底盖开设有光纤的通过孔，所述第一吹气部的下端设有用于控制移动退火管和固定退火管内气流大小的快门，所述快门包括与所述外壳下端相转动连接且通过转动从而调节通过孔大小的阀片，所述阀片的转轴垂直于所述底盖。
本发明还提供了一种光纤，其通过上述光纤拉丝退火装置生产得到。
由于上述技术方案运用，本发明与现有技术相比具有下列优点：本发明移动退火管通过所述驱动部调整位置，根据各种光纤的需求决定是否加装，在固定退火管下方加装移动退火管可以延长温场的长度，在移动退火管下方设置第一吹气部且第一吹气部输出的惰性气体的密度小于第二吹气部输出的惰性气体的密度，因此第一吹气部输出的惰性气体能够上行在上行过程中温度逐渐升高，直至到达拉丝炉管口，形成一个降温均匀而显著，同时长度更长的温场，上升的气体会同时将拉丝炉以及固定退火管内的碳化硅吹至拉丝炉炉口的废气收集板内。达到降低光纤内应力减少微裂纹最终降低光纤衰减，同时还可以通过下吹气使拉丝炉内以及退火管口沉积的碳化硅搜集在拉丝炉口的废气搜集板内，有效的提高光纤强度和拉丝效率。
附图说明
附图1为退火装置的结构示意图；
附图2为第一吹气部的结构示意图；
附图3为快门的结构示意图。
具体实施方式
下面结合附图所示的实施例对本发明作进一步描述。
如图1所示，光纤拉丝退火装置包括拉丝炉、连接于拉丝炉下方的固定退火管5、密封连接于所述固定退火管5下方用于延长退火温场的移动退火管6、用于带动所述移动退火管6移动的驱动部安装于所述固定退火管5上的气压表7以及安装于移动退火管上的氧分析仪8。
所述移动退火管6包括外管12、固定安装于所述外管12内的石墨内衬套11以及安装于所述外管12下端部上且向移动退火管6内供惰性气体的第一吹气部9，如图2所示，所述第一吹气部9包括外壳13、安装于所述外壳13内的导流块14，所述导流块14上设有分别将所述惰性气体向移动退火管6上端和下端输送的上导流通道15和下导流通道16。
所述拉丝炉下方设有第二吹气部（拉丝炉与第二吹气部均为现有技术，在此不做赘述），所述第二吹气部吹入的惰性气体的密度大于第一吹气部9吹入的惰性气体密度。所述上导流通道15内的惰性气体的流量大于下导流通道16内的惰性气体的流量。所述上导流通道15与所述石墨内衬套11的轴线的夹角为20°～40°。所述下导流通道16与所述石墨内衬套11的轴线的夹角为40°～60°。在本实施例中，上导流通道15与下导流通道16分别由多条，均匀分别在石墨内衬套11的轴线的周围，外壳13与导流块14之间形成外侧流道，与上导流通道15与下导流通道16相连通，外壳13的侧壁上设有进气口。
外壳13的底盖开设有光纤的通过孔，所述第一吹气部9的下端设有用于控制移动退火管6和固定退火管5内气流大小的快门，如图3所示，所述快门包括与所述外壳13下端相转动连接且通过转动从而调节通过孔大小的阀片10，所述阀片10的转轴垂直于所述底盖。在本实施例中，阀片10有两片且相对称设置，阀片10上各自开设有半圆缺口，两个阀片10闭合后两个半圆缺口闭合形成圆心通孔。
所述驱动部包括丝杆驱动机构，所述丝杆驱动机构包括螺杆1和螺纹连接与所述螺杆1上的螺母2，所述驱动机构还包括连接于所述丝杆机构的螺母2和所述外管12之间的连接件。所述连接件包括相转动连接且能锁紧的第一连杆3和第二连杆4，所述第一连杆3和所述第二连杆4分别与所述外管12和所述螺母2相转动连接，并且所述第一连杆3和所述外管12、所述第二连杆4和所述螺母2分别通过锁销固定相对位置。
本发明的工作原理如下：首先利用驱动部将移动退火管送至固定退火管下方附近，利用连接件进行微调，使移动退火管移至固定退火管正下方，再将连接件锁定，随后转动螺杆，带动移动退火管上行与固定退火管密封拼接，然后拉丝炉便可开始工作，同时，第二吹气部和第一吹气部工作，形成，形成一个降温均匀而显著，同时长度更长的温场，上升的气体会同时将拉丝炉以及固定退火管内的碳化硅吹至拉丝炉炉口的废气收集板内。达到降低光纤内应力减少微裂纹最终降低光纤衰减，通过上述拉丝炉生产得到的光纤的衰减低，同时还可以通过下吹气使拉丝炉内以及退火管口沉积的碳化硅搜集在拉丝炉口的废气搜集板内，有效的提高光纤强度和拉丝效率。
上述实施例只为说明本发明的技术构思及特点，其目的在于让熟悉此项技术的人士能够了解本发明的内容并据以实施，并不能以此限制本发明的保护范围。凡根据本发明精神实质所作的等效变化或修饰，都应涵盖在本发明的保护范围之内。

Claims (9)

  1. 一种光纤拉丝退火装置，它包括拉丝炉、连接于拉丝炉下方的固定退火管，其特征在于：它还包括密封连接于所述固定退火管下方用于延长退火温场的移动退火管以及用于带动所述移动退火管移动的驱动部，所述移动退火管包括外管、固定安装于所述外管内的石墨内衬套以及安装于所述外管下端部上且向移动退火管内供惰性气体的第一吹气部，所述第一吹气部包括外壳、安装于所述外壳内的导流块，所述导流块上设有分别将所述惰性气体向移动退火管上端和下端输送的上导流通道和下导流通道。
  2. 根据权利要求1所述的光纤拉丝退火装置，其特征在于：所述驱动部包括丝杆驱动机构，所述丝杆驱动机构包括螺杆和螺纹连接与所述螺杆上的螺母，所述驱动机构还包括连接于所述丝杆机构的螺母和所述外管之间的连接件。
  3. 根据权利要求2所述的光纤拉丝退火装置，其特征在于：所述连接件包括相转动连接且能锁紧的第一连杆和第二连杆，所述第一连杆和所述第二连杆分别与所述外管和所述螺母相转动连接，并且所述第一连杆和所述外管、所述第二连杆和所述螺母分别通过锁销固定相对位置。
  4. 根据权利要求1所述的光纤拉丝退火装置，其特征在于：所述拉丝炉下方设有第二吹气部，所述第二吹气部吹入的惰性气体的密度大于第一吹气部吹入的惰性气体密度。
  5. 根据权利要求1所述的光纤拉丝退火装置，其特征在于：所述上导流通道内的惰性气体的流量大于下导流通道内的惰性气体的流量。
  6. 根据权利要求1所述的光纤拉丝退火装置，其特征在于：所述上导流通道与所述石墨内衬套的轴线的夹角为20°～40°。
  7. 根据权利要求1所述的光纤拉丝退火装置，其特征在于：所述下导流通道与所述石墨内衬套的轴线的夹角为40°～60°。
  8. 根据权利要求1所述的光纤拉丝退火装置，其特征在于：外壳的底盖开设有光纤的通过孔，所述第一吹气部的下端设有用于控制移动退火管和固定退火管内气流大小的快门，所述快门包括与所述外壳下端相转动连接且通过转动从而调节通过孔大小的阀片，所述阀片的转轴垂直于所述底盖。
  9. 一种光纤，其特征在于：其通过权利要求1～8中任一光纤拉丝退火装置生产得到。
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