WO2019047419A1 - 套管棒拉丝装置和拉丝系统及其拉丝方法 - Google Patents

套管棒拉丝装置和拉丝系统及其拉丝方法 Download PDF

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WO2019047419A1
WO2019047419A1 PCT/CN2017/117118 CN2017117118W WO2019047419A1 WO 2019047419 A1 WO2019047419 A1 WO 2019047419A1 CN 2017117118 W CN2017117118 W CN 2017117118W WO 2019047419 A1 WO2019047419 A1 WO 2019047419A1
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WIPO (PCT)
Prior art keywords
rod
tail pipe
drawing device
casing
vacuum
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PCT/CN2017/117118
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English (en)
French (fr)
Inventor
沈小平
邓奋
蒋锡华
朱坤
魏文涛
唐成
田佳
祝君
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通鼎互联信息股份有限公司
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Publication of WO2019047419A1 publication Critical patent/WO2019047419A1/zh

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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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • 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
    • 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 present application relates to the field of optical fiber preform manufacturing, and more particularly to a casing rod drawing device and a wire drawing system and a wire drawing method thereof.
  • a mandrel is manufactured by VAD method and purchased by quartz sleeve assembly, supplemented by drawing furnace heating and vacuuming, so that the mandrel and outer casing are online.
  • the production of melt-forming optical fiber preforms (RIC rods) is gradually evolving.
  • the traditional RIC rod fiber production in the production stage of the tail rod production stage that is, the connection between the mandrel and the ram into the drawing furnace, the deformation of the cone is often occurred at the production site, the mandrel is tilted up, and the end of the rod is Distortion and even melting, etc., resulting in a large number of unqualified optical properties such as cut-off wavelength, dispersion, geometric performance such as core package concentricity error, greatly reducing the production pass rate, wasting production raw materials and Production time.
  • the purpose of the present application is to solve at least one of the above problems.
  • the present application provides a casing rod drawing device, a wire drawing system and a wire drawing method thereof, which have high qualified parameters of a tail bar optical fiber.
  • a casing rod drawing device comprising an outer sleeve, a mandrel, a tail pipe and a hose, the outer sleeve and the tail tube are fused to form a melting cone provided with a cavity, and the front end of the core rod is inserted In the cone portion of the outer sleeve, the hose communicates with the inner cavity of the melting cone, and the casing rod drawing device is further provided with a ejector rod and a double sealing structure, one end of the ejector rod is provided with a refractory end, and the refractory end is abutted Mandrel rear end, double seal knot The structure is placed at the end of the tail pipe and sealed at the end of the tail pipe.
  • the double sealing structure comprises a sealing cover assembly and a sealing cap assembly, wherein a central portion of the sealing cover assembly is provided with a through hole, the sealing cap assembly is sealed and fastened to a corresponding position on the through hole of the sealing cover assembly, and the other end of the plunger passes through the through hole Extend into the seal cap assembly.
  • the refractory tip has a cylindrical shape, and the bottom of the refractory tip has a diameter of 65 to 75 mm and a height of 95 to 105 mm.
  • the end surface of the refractory end is provided with a groove, and the rear end of the core rod is inserted into the groove, and is engaged with the refractory end to achieve the top contact.
  • the sealing cap assembly comprises a nut, an O-ring sealing ring and a top cap, the O-ring sealing ring is sleeved in the nut and fixedly connected with the sealing cover assembly, and the top cap is crimped to the other end of the plunger and fixedly connected with the nut .
  • the sealing cover assembly comprises a tail tube slot tray, a tail tube sealing cover, a connecting rod, a fixing block, a fastening bolt and an expanded PTFE gasket, and the tail tube slot tray is clamped on the outer wall of the tail pipe, and the tail pipe sealing cover Buckle the end of the tail pipe, the expanded Teflon gasket is placed between the end of the tail pipe and the tail pipe sealing cover, and the tail pipe sealing cover and the tail pipe groove tray pass the fixing block, the fastening bolt and the connecting rod Tighten each other and seal the end of the tail pipe.
  • a wire drawing system comprising a casing rod drawing device
  • the wire drawing system comprising a drawing furnace body, a heating body, a vacuum control system, a vacuum pump and a casing rod drawing device
  • the casing drawing rod drawing device is inserted into the drawing
  • the drawing furnace body is filled with inert gas
  • the heating body is located in the drawing furnace body
  • the drawing furnace body is heated
  • the vacuum pump is connected to one end of the hose
  • the vacuum pump is controlled to open and close the vacuum pump to realize the inner cavity of the melting cone Control of the degree of vacuum.
  • a wire drawing method includes: drawing using the wire drawing system, and when the refractory end of the wire rod drawing device enters the wire drawing furnace, the vacuum control system determines the timing of closing the vacuum pump according to the determination.
  • the vacuum pump is turned off, and the casing drawing rod drawing device maintains a certain degree of vacuum in the inner cavity of the melting cone until the end of the drawing by virtue of its double sealing structure.
  • the determined timing of closing the vacuum pump is determined by the diameter of the wire drawing device of the casing rod and the remaining length of the wire drawing.
  • the vacuum pump is turned off when the remaining drawing length is 300 to 350 km.
  • the certain degree of vacuum is lower than -0.2 bar.
  • the application improves the style of the ejector rod in the traditional RIC rod structure, and provides a double sealing structure, and at the same time proposes a drawing scheme for closing the vacuum in the tail rod production stage, and the drawing environment of the inner core rod of the RIC rod tail rod is improved simply and effectively. , greatly improved the pass rate of the tail rod fiber parameters.
  • FIG. 1 shows a schematic view of a casing rod drawing device according to an embodiment of the present application
  • FIG. 2 shows a schematic view of a wire drawing system in accordance with an embodiment of the present application.
  • a casing rod drawing device comprises an outer sleeve 1 , a mandrel 2 , a tail pipe 3 and a hose.
  • the outer sleeve 1 and the tail pipe 3 are melted and abutted to form a melting cone provided with a cavity, and a core rod 2 inserted in the outer sleeve 1, the hose is connected with the inner cavity of the melting cone, the casing rod drawing device is further provided with a ram 4 and a double sealing structure, and the ejector rod 4 and the mandrel 2 are sequentially grounded at the inner cavity and the top.
  • the end of the rod 4 with the mandrel 2 is provided with a refractory tip 410 which is fastened to the end of the tail pipe 3 and seals the end of the tail pipe 3.
  • the enlarged size of the refractory end ensures that after the tail pipe end enters the drawing furnace, the ejector pin 4 is not easily softened and deformed, and can withstand the mandrel and reduce the possibility of the mandrel moving up and tilting.
  • the end surface of the refractory tip 410 is provided with a groove, and one end of the mandrel 2 is inserted into the groove and is engaged with the refractory tip 410.
  • This arrangement ensures that the ejector pin can always catch the end of the mandrel, so that the ejector pin is vertically stressed, and the mandrel is not subjected to lateral force and tilted due to misalignment.
  • a vacuum pump is arranged at one end of the hose, and a melting cone is formed by a vacuum pump
  • the vacuum environment of the cavity causes the mandrel and the outer sleeve to be melted in-line to form an optical fiber preform.
  • the core rod is gradually reduced, and its own weight is continuously reduced, and the vacuum pressure of -1 bar is no longer needed to ensure that the core rod does not fall.
  • the vacuum inside the tail pipe should be closed to reduce the pressure difference between the inside of the drawing furnace and the cone, and reduce the upward pressure on the rod cone and the mandrel.
  • the vacuum inside the cone decreases too fast, the core rod The cause of self-weight is likely to move down.
  • the double seal structure ensures a slow drop in vacuum.
  • the double sealing structure includes a sealing cover assembly 11 and a sealing cap assembly 12, and a central portion of the sealing cover assembly 11 is provided with a through hole, and the sealing cap assembly 12 is sealingly fastened to a position corresponding to the through hole on the sealing cover assembly 11, the ejector 4 The other end extends through the through hole into the sealing cap assembly 12.
  • the sealing cap assembly 12 includes a nut, an O-type fluoro rubber sealing rubber ring and a top cover.
  • the O-shaped fluoro rubber sealing rubber ring is built in the nut, and the top cover is fixed to the surface of the sealing cover assembly 11 by a nut.
  • the sealing cover assembly 11 comprises a tail pipe slot tray 5, a tail pipe sealing cover 10, a connecting rod 6, a fixing block 8, a fastening bolt 9 and an expanded tetrafluoroethylene pad 7, and the tail pipe slot tray 5 is stuck in the tail pipe 3 outer wall, the tail pipe sealing cover 10 is fastened to the end of the tail pipe 3, the expanded tetrafluoroethylene pad 7 is placed between the end of the tail pipe 3 and the tail pipe sealing cover 10, and the fixing block 8 is disposed on the tail pipe sealing cover One end of the connecting rod 6 is fastened and connected to the tail pipe slot tray 5, and the other end is fastened and fastened to the fixing block 8 by fastening bolts, thereby achieving tightening and gathering of the tail pipe sealing cover 10 and the tail pipe slot tray 5.
  • the double sealing device can ensure that the vacuum can be maintained at about -0.2 bar 3 hours after the vacuum pump is turned off, which can ensure that the weight between the ejector pin and the mandrel and the pressure difference are balanced.
  • the present application also relates to a wire drawing system including the wire drawing device of the casing rod, the wire drawing system comprising a drawing furnace body 100, a heating element 200, a vacuum control system, a vacuum pump and a casing rod drawing device, and a casing
  • the drawing rod drawing device is suspended to the hanging rod platform and inserted into the drawing furnace body 100.
  • the drawing furnace body 100 is filled with an inert gas.
  • the heating element 200 is located in the drawing furnace body 100, and the drawing furnace body 100 is heated, and the vacuum pump is set. At one end of the hose and controlled by a vacuum control system, the other end of the hose is connected to the inner cavity of the cone.
  • the vacuum control system closes the vacuum pump, so that the vacuum of the inner chamber slowly decreases.
  • the time to close the vacuum pump is determined by the diameter of the outer casing and the remaining length of the wire drawing.
  • the remaining length of the wire drawing is calculated by subtracting the length of the wire drawing from the predetermined wire drawing length of the wire drawing device of the casing bar, and can be set according to the diameter of the wire drawing device of the casing rod.
  • the vacuum control system will close when the remaining length of the drawing is 350 km. Close the vacuum pump.

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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)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

套管棒拉丝装置和拉丝系统及其拉丝方法，该套管棒拉丝装置通过将顶杆（4）的与芯棒（2）接触的一端设置为难熔端头（410），避免了拉丝过程中顶杆（4）容易扭曲变形的情况，同时通过设置双重密封结构，保证了由尾管（3）和外套管（1）熔融相接而成的熔锥的内部的密封环境，使套管棒拉丝装置的芯棒（2）与顶杆（4）间的受力达到平衡，实现改善尾棒光纤参数的目的。

Description

套管棒拉丝装置和拉丝系统及其拉丝方法 技术领域
本申请涉及光纤预制棒制造领域，特别涉及套管棒拉丝装置和拉丝系统及其拉丝方法。
背景技术
在光纤生产制造行业，由于受制于国内光纤预制棒的产能供应限制，一种以VAD法制造芯棒并外购石英套管组装，辅以拉丝炉加热同时抽真空，使芯棒与外套管在线融缩形成光纤预制棒(RIC棒)的生产方式正在逐渐发展。但传统的RIC棒光纤生产在尾棒生产阶段即芯棒与顶杆连接部进入拉丝炉内后的生产阶段，生产现场往往会出现融锥锥部变形，芯棒上移倾斜，顶杆尾端扭曲变形甚至熔断等情况，使得所产光纤在光学性能如截止波长、色散，几何性能如芯包同心度误差等多方面出现大量的不合格，极大地降低了生产合格率，浪费了生产原材料及生产时间。
有鉴于此，申请人针对出现尾棒光纤参数不合格的原因进行了深入分析，发现当尾管端进入拉丝炉炉内后，由于尾管材质不透光，原本由预制棒在拉丝炉外端导出的部分光热被完全缩在了炉内，炉温升高，而尾管内的石英顶杆受热软化，失去了顶住芯棒上移的功能，芯棒受力失衡，在炉内及尾管内真空的压差下，发生上移，由于顶杆软化变形，芯棒侧向受力，还会发生倾斜，这些都导致了RIC棒尾棒生产的光纤参数不合格。
申请内容
本申请的目的是为解决以上问题的至少一个，本申请提供一种尾棒光纤参数合格率高的套管棒拉丝装置和拉丝系统及其拉丝方法。
根据本申请的一个方面，提供一种套管棒拉丝装置，包括外套管、芯棒、尾管和软管，外套管与尾管熔融对接形成设有内腔的熔锥体，芯棒前端插于外套管的锥体部，软管与熔锥的内腔连通，套管棒拉丝装置还设有顶杆和双重密封结构，顶杆一端设有难熔端头，并且，难熔端头顶抵芯棒后端，双重密封结 构设置在尾管的末端，并对尾管的末端密封。
其中，双重密封结构包括密封盖组件和密封帽组件，密封盖组件的中心部分设有通孔，密封帽组件密封扣于密封盖组件上通孔对应的位置，顶杆的另一端穿过通孔伸入密封帽组件内。
其中，难熔端头为圆柱体形状，难熔端头的底部直径为65～75mm，高度为95～105mm。
其中，难熔端头的端面设有凹槽，芯棒的后端塞入凹槽内，并与难熔端头卡接实现顶抵。
其中，密封帽组件包括螺帽、O型密封胶圈和顶帽，螺帽内套设O型密封胶圈并与密封盖组件固定连接，顶帽压接顶杆另一端并与螺帽固定连接。
其中，密封盖组件包括尾管卡槽托盘、尾管密封盖、连接杆、固定块、紧固螺栓和膨体四氟乙烯垫，尾管卡槽托盘卡设于尾管外壁，尾管密封盖扣于尾管的末端，膨体四氟乙烯垫垫设于尾管的末端与尾管密封盖之间，尾管密封盖和尾管卡槽托盘通过固定块、紧固螺栓和连接杆的配合彼此收紧聚拢，对尾管的末端实现密封。
根据本申请的第二方面，提供包含套管棒拉丝装置的拉丝系统，该拉丝系统包括拉丝炉体、发热体、真空控制系统、真空泵和套管棒拉丝装置，套管拉丝棒拉丝装置插入拉丝炉体内，拉丝炉体内充有惰性气体，发热体位于拉丝炉体内，并对拉丝炉体进行加热，真空泵连接软管的一端，并通过真空控制系统控制真空泵的开启和关闭实现对熔锥内腔真空度的控制。
根据本申请的第三方面提供一种拉丝方法，包括：使用该拉丝系统进行拉丝，当套管棒拉丝装置的难熔端头进入拉丝炉炉内后，真空控制系统根据确定的关闭真空泵的时机关闭真空泵，套管拉丝棒拉丝装置依靠其双重密封结构维持熔锥内腔内一定真空度直至拉丝结束。
其中，确定的关闭真空泵的时机由套管棒拉丝装置的直径和拉丝剩余长度决定，当套管棒拉丝装置的直径为150mm时，在剩余拉丝长度为300～350公里时关闭真空泵。
其中，一定真空度为低于-0.2bar。
本申请具有以下有益效果：
本申请改进了传统的RIC棒结构中顶杆的样式，并设置了双重密封结构，同时提出了尾棒生产阶段关闭真空的拉丝方案，简洁有效地改善了RIC棒尾棒内芯棒的拉丝环境，大大提高了尾棒光纤参数合格率。
附图说明
通过阅读下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本申请的限制。而且在整个附图中，用相同的参考符号表示相同的部件。在附图中：
图1示出了根据本申请实施方式的套管棒拉丝装置的示意图；
图2示出了根据本申请实施方式的拉丝系统的示意图。
具体实施方式
下面将参照附图更详细地描述本公开的示例性实施方式。虽然附图中显示了本公开的示例性实施方式，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施方式所限制。相反，提供这些实施方式是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
如图1所示，一种套管棒拉丝装置，包括外套管1、芯棒2、尾管3和软管，外套管1与尾管3熔融对接形成设有内腔的熔锥，芯棒2插于外套管1内，软管与熔锥的内腔连通，套管棒拉丝装置还设有顶杆4和双重密封结构，顶杆4和芯棒2依次首尾相对接地位于内腔，顶杆4的与芯棒2的相接端设有难熔端头410，双重密封结构扣于尾管3的末端，并对尾管3的末端密封。
难熔端头410的尺寸为？，难熔端头的加大尺寸设置，保证了尾管端进入拉丝炉后，顶杆4不易被软化变形，能够顶住芯棒，降低芯棒上移和倾斜的可能。
难熔端头410的端面设有凹槽，芯棒2的一端塞入所述凹槽内，并与难熔端头410卡接。如此设置保证了顶杆始终都能卡住芯棒末端，使得顶杆垂直受力，不会因为错位，使芯棒横向受力进而发生倾斜。
传统的拉丝棒拉丝装置，软管的一端设置真空泵，通过真空泵形成熔锥内 腔的真空环境，使芯棒与外套管在线融缩形成光纤预制棒，随着生产的进行，芯棒逐渐减少，其自重不断减轻，不再需要-1bar的真空压力以保证芯棒不会下移，因此应关闭尾管内真空，减少拉丝炉内与熔锥内部压差，减少棒锥及芯棒所受的向上压力，但关闭真空后，熔锥内真空度如果下降过快，芯棒因自重原因容易发生下移。双重密封结构的设置，可保证真空度的缓慢下降。
双重密封结构包括密封盖组件11和密封帽组件12，密封盖组件11的中心部分设有通孔，密封帽组件12密封扣于密封盖组件11上所述通孔对应的位置，顶杆4的另一端穿过通孔伸入密封帽组件12内。
密封帽组件12包括螺帽、O型氟橡胶密封胶圈和顶盖，O型氟橡胶密封胶圈内置于螺帽中，顶盖通过螺帽固定在密封盖组件11的表面。密封盖组件11包括尾管卡槽托盘5、尾管密封盖10、连接杆6、固定块8、紧固螺栓9和膨体四氟乙烯垫7，尾管卡槽托盘5卡设于尾管3外壁，尾管密封盖10扣于尾管3的末端，膨体四氟乙烯垫7垫设于尾管3的末端与尾管密封盖10之间，固定块8设置于尾管密封盖上，连接杆6的一端与尾管卡槽托盘5紧固连接，另一端通过紧固螺栓与固定块8紧固连接，实现对尾管密封盖10和尾管卡槽托盘5的收紧聚拢，从而对尾管3的末端实现密封。经多次试验，该双重密封装置可保证，在真空泵关闭后3小时，真空仍能保持在-0.2bar左右，能够保证顶杆、芯棒自重与压差达到平衡。
如图2所示，本申请还涉及一种包括该套管棒拉丝装置的拉丝系统，该拉丝系统包括拉丝炉体100、发热体200、真空控制系统、真空泵和套管棒拉丝装置，套管拉丝棒拉丝装置被悬挂至吊棒平台，并插入拉丝炉体100内，拉丝炉体100内充有惰性气体，发热体200位于拉丝炉体100内，并对拉丝炉体100进行加热，真空泵设置于软管的一端，并通过真空控制系统控制，软管的另一端与熔锥的内腔接通。
拉丝时，当套管棒拉丝装置的难熔端头410进入拉丝炉炉内后，真空控制系统关闭真空泵，使得内腔的真空缓慢下降。关闭真空泵的时间由外套管的直径和拉丝剩余长度决定，拉丝剩余长度由套管棒拉丝装置的预定拉丝长度减去已经拉丝的长度而计算的，可根据套管棒拉丝装置的直径进行设定，当套管棒拉丝装置的直径为150mm时，真空控制系统将在拉丝剩余长度为350公里时关 闭真空泵。
以上所述，仅为本申请较佳的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (10)

  1. 套管棒拉丝装置，包括外套管(1)、芯棒(2)、尾管(3)和软管，所述外套管(1)与所述尾管(3)熔融对接形成设有内腔的熔锥体，所述芯棒(2)前端插于外套管(1)的锥体部，所述软管与所述熔锥的内腔连通，其特征在于，
    所述套管棒拉丝装置还设有顶杆(4)和双重密封结构，所述顶杆(4)一端设有难熔端头(410)，并且，所述难熔端头(410)顶抵所述芯棒(2)后端，所述双重密封结构设置在所述尾管(3)的末端，并对所述尾管(3)的末端密封。
  2. 如权利要求1所述的套管棒拉丝装置，其特征在于，
    所述双重密封结构包括密封盖组件(11)和密封帽组件(12)，所述密封盖组件(11)的中心部分设有通孔，所述密封帽组件(12)密封扣于所述密封盖组件(11)上所述通孔对应的位置，所述顶杆(4)的另一端穿过所述通孔伸入所述密封帽组件(12)内。
  3. 如权利要求1所述的套管棒拉丝装置，其特征在于，
    所述难熔端头(410)的端面设有凹槽，所述芯棒(2)的后端塞入所述凹槽内，并与所述难熔端头(410)卡接实现顶抵。
  4. 如权利要求1所述的套管棒拉丝装置，其特征在于，
    所述难熔端头(410)的端面设有凹槽，所述芯棒(2)的后端塞入所述凹槽内，并与所述难熔端头(410)卡接实现顶抵。
  5. 如权利要求2所述的套管棒拉丝装置，其特征在于，
    所述密封帽组件(12)包括螺帽、O型密封胶圈和顶帽，所述螺帽内套设所述O型密封胶圈并与所述密封盖组件(11)固定连接，所述顶帽压接所述顶杆(4)另一端并与所述螺帽固定连接。
  6. 如权利要求2所述的套管棒拉丝装置，其特征在于，
    密封盖组件(11)包括尾管卡槽托盘(5)、尾管密封盖(10)、连接杆(6)、固定块(8)、紧固螺栓(9)和膨体四氟乙烯垫(7)，所述尾管卡槽托盘(5)卡设于所述尾管(3)外壁，所述尾管密封盖(10)扣于所述尾管(3)的末端，所述膨体四氟乙烯垫(7)垫设于所述尾管(3)的末端与所述尾管密封盖(10)之间，所述尾管密封盖(10)和所述尾管卡槽托盘(5)通过固定块(8)、所述 紧固螺栓(9)和所述连接杆(6)的配合彼此收紧聚拢，对所述尾管(3)的末端实现密封。
  7. 包括如权利要求1～6任意一项所述的套管棒拉丝装置的拉丝系统，其特征在于
    所述拉丝系统包括拉丝炉体(100)、发热体(200)、真空控制系统、真空泵和所述套管棒拉丝装置，所述套管拉丝棒拉丝装置插入所述拉丝炉体(100)内，所述拉丝炉体(100)内充有惰性气体，所述发热体(200)位于所述拉丝炉体(100)内，并对所述拉丝炉体(100)进行加热，所述真空泵连接所述软管的一端，并通过真空控制系统控制真空泵的开启和关闭实现对所述熔锥内腔真空度的控制。
  8. 拉丝方法，其特征在于，包括：
    使用如权利要求7中所述的拉丝系统进行拉丝，当所述套管棒拉丝装置的难熔端头(410)进入拉丝炉炉内后，真空控制系统根据确定的关闭真空泵的时机关闭真空泵，所述套管拉丝棒拉丝装置依靠所述双重密封结构维持熔锥内腔内一定真空度直至拉丝结束。
  9. 如权利要求8所述的拉丝方法，其特征在于，
    所述确定的关闭真空泵的时机由套管棒拉丝装置的直径和剩余长度决定，当套管棒拉丝装置的直径为150mm时，在剩余拉丝长度为300～350公里时关闭真空泵。
  10. 如权利要求8所述的拉丝方法，其特征在于，所述一定真空度为低于-0.2bar。
PCT/CN2017/117118 2017-09-06 2017-12-19 套管棒拉丝装置和拉丝系统及其拉丝方法 WO2019047419A1 (zh)

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