CN209456303U - A kind of preform female rod stretching device of VAD sintering - Google Patents
A kind of preform female rod stretching device of VAD sintering Download PDFInfo
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- CN209456303U CN209456303U CN201822158062.1U CN201822158062U CN209456303U CN 209456303 U CN209456303 U CN 209456303U CN 201822158062 U CN201822158062 U CN 201822158062U CN 209456303 U CN209456303 U CN 209456303U
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- female rod
- stick
- stretching
- preform
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Abstract
The utility model relates to a kind of preform female rod stretching devices of VAD sintering, including the upper chuck, stretching furnace, lower chuck being sequentially arranged along the vertical direction；The upper chuck can be rotated and be gone up and down, and the pull-up that upper chuck sandwiched is welded on preform female rod upper end extends stick；The stretching furnace can be gone up and down；The lower chuck can rotate, and lower chuck sandwiched pulls down the stick that extends, and the VAD deposition target head of preform female rod lower end is fixed on drop-down and extends in stick.The utility model can not only guarantee that preform female rod stretched quality and efficiency, but also can save and draw stick dosage, reduce and draw stick welding times.
Description
Technical field
The utility model relates to a kind of preform female rod stretching devices of VAD sintering, belong to preform preparation
Technical field.
Background technique
Preform is the key raw material of optical fiber cable, and prefabricated rods manufacturing technology is by institute, offshore company ridge for a long time
It is disconnected, lead to China's preform heavy dependence import, hinders the development of China's optical communication network.With China's optical communication net
The continuous expansion of network scale, the demand to prefabricated rods increasingly increase severely, and exploitation high quality prefabricated rods have become the weight of optical communication field
Want project.However, production technology and the technique requirement of prefabricated rods are very high, fund input amount is big, makes domestic many preforms
New preparation technology also fails to fully achieve industrial application, restricts the development of China's preform.
Currently, the technique of production preform mainly uses two-step method, i.e., optical fiber prefabricated rod mandrel is first manufactured, is then existed
Covering is manufactured outside optical fiber prefabricated rod mandrel.Wherein, the prefabricated rods preparation method that can produce high-quality optical fiber mainly has following four
Kind: modified chemical vapor deposition method (MCVD), microwave plasma chemical vapor deposition (PCVD), outside vapor deposition
(OVD) and axial vapor deposition method (VAD), the main manufacturing technology of surrounding layer include OVD method, tiretube process, plasma spray coating
Method.
In preform production process, drawing process is very heavy to the bow degree and diameter uniformity of plug after stretching
It wants.Document number is that the patent of CN1890189A discloses a kind of method of horizontal direction stretching optical fiber base material, and this method is in level
Due to the effect of barred body self gravity in drawing process, it is difficult to control the bow degree of prefabricated rods, will cause prefabricated stick drawn wire optical fiber
There are biggish fibre core/cald concentricity errors.And document number is that CN102627399B patent discloses a kind of vertical direction drawing
The method of optical fiber base material is stretched, which contains test macro and signal feedback system, can automatically control prefabricated after stretching
The outer diameter of stick, but in actual production process when detecting that drawing effect is bad, which can carry out the relevant parameter of stretching
Adjustment, but after adjusting parameter its influences generated embodiment in the effect after stretching when have very big hysteresis quality, so as to cause
Plug geometry and optical property decline after draw efficiency and stretching, this will lead to, and the production cost increases, also results in very to raw material
Big waste.
In addition, in the stretching technique of existing fiber prefabricated rods female rod, the preform female rod upper and lower ends meeting of VAD sintering
That first welds stretching draws stick, fixes clamping respectively above and below stretching furnace on two fixed chucks, upper and lower two fixed chucks
With concentric fixture, preform female rod heats post-tensioning by high-temperature region.Therefore, demand of the stretching process to stick is drawn compares
Greatly, and draw stick due to brittleness increase after multiplexing number increase, it is easy to cause the risk fallen stick in drawing process, pound stick.
Utility model content
Technical problem to be solved by the utility model is: be directed to above-mentioned prior art Shortcomings, provide it is a kind of both can be with
Guarantee that preform female rod stretches quality and efficiency, and can save and draw stick dosage, reduce the VAD sintering for drawing stick welding times
Preform female rod stretching device.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
A kind of preform female rod stretching device of VAD sintering, including be sequentially arranged along the vertical direction upper chuck, draw
Stretch furnace, lower chuck；
The upper chuck can be rotated and be gone up and down, and the pull-up that upper chuck sandwiched is welded on preform female rod upper end extends
Stick；
The stretching furnace can be gone up and down；
The lower chuck can rotate, and lower chuck sandwiched pulls down the stick that extends, the VAD deposition targets of preform female rod lower end
Head is fixed on drop-down and extends in stick.
Preferably, the preform female rod stretching device of the VAD sintering further includes caliper, and the caliper is located at
Below stretching furnace, and it is connected with stretching furnace.
Preferably, the drop-down extends stick as cylinder open at one end, and the barrel of the cylinder, which includes that outer diameter is identical, to be leaned on
The thick wall portion of the thinner wall section in nearly cartridge openings direction and separate cartridge openings direction, the internal diameter of the thinner wall section is than in thick wall portion
Diameter is big.
Preferably, the preform female rod is that VAD deposits sintered solid core glass bar.
Preferably, the stick that extends that pulls up is the quartz glass bar that diameter is less than preform female rod.
Preferably, it is provided with above caliper for heat-insulated graphite heat insulation loop.
Preferably, the stretching furnace is graphite resistor furnace or electric induction furnace, is filled with inertia in heating region when heating and protects
Protect gas.
The beneficial effects of the utility model are:
The preform female rod stretching device of the utility model can be such that the use of preform female rod draws straight up
The mode stretched avoids female rod from being influenced the bow degree of plug by gravity when stretching, and obtains the concentricity of plug after stretching
Control has been arrived, ensure that the bow degree of plug after preform female rod stretches, the geometry uniformity of plug is more preferable, precision
It is higher；During stretching, upper and lower scroll chuck synchronous rotary is heated evenly female rod in stretching furnace, further improves stretching
Efficiency reduces the case where mandrel surface wrinkles after stretching, to improve the geometry and optical property of plug；Meanwhile
The preform female rod upper end welding of stretching pulls up the stick that extends, and the target head that lower end is still deposited with VAD greatly reduces lower stretching
Draw the dosage of stick, while also saving welding and pulling down the hydrogen-oxygen throughput used in stick that extends, reduces welding and pull down the stick that extends
Working hour, further improve production efficiency；In addition the included invalid reducing district in female rod lower end stretched itself, originates stretching
Stage is stretched to diameter qualification using the reducing district, it is possible to reduce plug is scrapped, and the manufacturing cost of plug is further decreased.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural schematic diagram of the preform female rod stretching device of the utility model embodiment；
Fig. 2 is that the drop-down of the utility model embodiment extends the structural schematic diagram of stick 6；
Appended drawing reference in figure are as follows: 1- upper chuck, 2- pull up the stick that extends, 3- preform female rod, 4- stretching furnace, 5- survey
Diameter instrument, 6- pull down the stick that extends, 7- lower chuck.
Specific embodiment
The utility model is described in further detail presently in connection with attached drawing.These attached drawings are simplified schematic diagram,
Only illustrate the basic structure of the utility model in a schematic way, therefore it only shows composition related with the utility model.
Embodiment 1
The present embodiment provides a kind of preform female rod stretching devices of VAD sintering, as shown in Figure 1, including along vertical
Upper chuck 1 that direction is sequentially arranged, stretching furnace 4, caliper 5, lower chuck 7；
The upper chuck 1 can be rotated and be gone up and down, and 1 sandwiched of upper chuck is welded on the pull-up of 3 upper end of preform female rod
Extend stick 2；
The stretching furnace 4 can be gone up and down；
The lower chuck 7 can rotate, and 7 sandwiched of lower chuck pulls down the stick 6 that extends, and the VAD of 3 lower end of preform female rod is heavy
Product target head is fixed on drop-down and extends in stick 6；
The caliper 5 is connected with stretching furnace 4, for measuring the diameter of every section of preform female rod 3, in caliper 5
Top is provided with for heat-insulated graphite heat insulation loop.
In use, the pull-up for being welded on 3 upper end of the preform female rod stick 2 that extends is fixed to clamp by upper chuck 1, pass through
The lifting of upper chuck 1 makes preform female rod 3 pass vertically through stretching furnace 4, and is inserted into the target head of preform female rod 3
It pulls down fixed in the stick 6 that extends；The caliper 5 of 4 lower end of stretching furnace is moved to the stretching start bit of 3 lower end of preform female rod
It sets, measures and acquire the diameter of each position section preform female rod 3；Calculate upper chuck 1 moves up speed, the upper card
Disk 1 moves up speed diameter according to required for plug after stretching, the speed that stretching furnace 4 moves up and the section that is stretched
The diameter of preform female rod 3 determines；Before heating stretches, make upper chuck 1 and lower chuck 7 with identical revolving speed synchronous rotary,
It is then turned on stretching furnace 43 lower end of preform female rod is started to heat, it is made to fade to semi-molten state；In control
Chuck 1 carries out stretch processing to preform female rod 3 with the speed that moves up being calculated, and is consequently formed and prolongs from bottom to top
The plug stretched；Wherein, the diameter of the preform female rod 3 be 80~100mm, after the stretching diameter of plug be 30~
50mm, described is 5-8mm/min, and described is 30-40mm/min, meets V during the entire stretching process3×D1 2=V2×(D1 2-
D2 2), V3For the real-time movement speed of upper chuck 1, V2Speed, D are moved up for preset stretching furnace 41For section predispersed fiber that is stretched
The diameter of stick female rod 3 processed, D2For diameter required for plug after stretching.
As depicted in figs. 1 and 2, the drop-down extends stick 6 as cylinder open at one end, and the barrel of the cylinder includes outer diameter
The thick wall portion of the thinner wall section in identical close cartridge openings direction and separate cartridge openings direction, the internal diameter of the thinner wall section is than thick
The internal diameter of wall portion is big, this design facilitates 3 target head of preform female rod to be fixed on drop-down by opening and extend in stick 6；Further,
6 thinner wall section of stick that extends that pulls down is provided with a radial opening, and the purpose is to the target head of preform female rod 3 is passed through insertion diameter
Bolt into opening is fixed.
The drop-down extends, and the processing is simple for stick 6, and reusable, greatly reduces the use for pulling down the stick 6 that extends
Amount；It is using bolt that female rod target rod and the drop-down stick 6 that extends is fixed, it can guarantee plug after stretching using the concentricity of upper and lower scroll chuck
Bow degree.
Preferably, the preform female rod 3 is that VAD deposits sintered solid core glass bar, described to pull up the stick 2 that extends
Be less than the quartz glass bar of preform female rod 3 for diameter, can to avoid when being stretched to preform 3 top of female rod due to
The stick 2 that extends is pulled up to scrap into the caused plug geometric dimension of high-temperature region melting in advance.
Preferably, the stretching furnace 4 be graphite resistor furnace or electric induction furnace, heating and temperature control at 1800-2200 DEG C,
Inert protective gas is filled in heating region when heating.
Embodiment 2
The present embodiment stretches the preform female rod 3 of the average diameter 83mm of VAD technique preparation, length 600mm, described
3 upper end of preform female rod is welded with diameter 60mm, the pull-up of length 1000mm extends stick 2 (quartz draws stick), optical fiber prefabricating
The lower end of stick female rod 3 remains with target head when VAD deposition hangs stick.
The drawing process of preform female rod 3 are as follows:
The pull-up for being welded on 3 upper end of preform female rod is extended the fixing to clamp by upper chuck 1 of stick 2, upper card is passed through
The lifting of disk 1 makes preform female rod 3 pass vertically through stretching furnace 4, and the target head of preform female rod 3 is made to be inserted into drop-down
It extends in the opening of stick 6 (preferably quartz draws stick), the target head of preform female rod 3 is pulled down into 6 diameter of stick that extends by being inserted into
Bolt into opening is fixed；
The caliper 5 of 4 lower end of stretching furnace is moved to stretching initial position (the female rod position of 3 lower end of preform female rod
Set P=0mm), measure and acquire the diameter of each position section preform female rod 3；Calculate upper chuck 1 moves up speed,
The upper chuck 1 move up speed diameter according to required for plug after stretching, the speed that stretching furnace 4 moves up and
The diameter for section preform female rod 3 that is stretched determines；
Before heating stretches, makes upper chuck 1 and lower chuck 7 with identical revolving speed synchronous rotary, be then turned on 4 pairs of light of stretching furnace
Fine 3 lower end of prefabricated rods female rod starts to be heated, and heating temperature is 1800 DEG C, it is made to fade to semi-molten state；
The lower chuck 7 of 4 lower end of stretching furnace is only rotated, and is not moved along the vertical direction, and stretching furnace 4 moves up, so as to
It gives preform female rod 3 different position section heating, while controlling upper chuck 1 and moving up speed to light with what is be calculated
Fine prefabricated rods female rod 3 carries out stretch processing, forms plug；Meet V during the entire stretching process3=V2×(D1 2-D2 2)/D1 2,
In, V3For the real-time movement speed of upper chuck 1, V2Speed, D are moved up for preset stretching furnace 41For section optical fiber that is stretched
The diameter of prefabricated rods female rod 3, D2For diameter required for plug after stretching.
Wherein, D1、D2、V1、V2Equal parameter informations are as shown in table 1, and the geometric parameter of plug is as shown in table 2 below after stretching.
1 female rod diameter parameters of table and tensile speed parameter list
Geometric parameter after 2 plug of table stretches
Embodiment 3
The present embodiment stretches the preform female rod 3 of the average diameter 100mm of VAD technique preparation, length 450mm, institute
State that 3 upper end of preform female rod is welded with diameter 60mm, the pull-up of length 1000mm extends stick 2 (quartz draws stick), predispersed fiber
The lower end of stick female rod 3 processed remains with target head when VAD deposition hangs stick.
The drawing process of preform female rod 3 are as follows:
The pull-up for being welded on 3 upper end of preform female rod is extended the fixing to clamp by upper chuck 1 of stick 2, upper card is passed through
The lifting of disk 1 makes preform female rod 3 pass vertically through stretching furnace 4, and the target head of preform female rod 3 is made to be inserted into drop-down
It extends in the opening of stick 6 (preferably quartz draws stick), the target head of preform female rod 3 is pulled down into 6 diameter of stick that extends by being inserted into
Bolt into opening is fixed；
The caliper 5 of 4 lower end of stretching furnace is moved to stretching initial position (the female rod position of 3 lower end of preform female rod
Set P=0mm), measure and acquire the diameter of each position section preform female rod 3；Calculate upper chuck 1 moves up speed,
The upper chuck 1 move up speed diameter according to required for plug after stretching, the speed that stretching furnace 4 moves up and
The diameter for section preform female rod 3 that is stretched determines；
Before heating stretches, makes upper chuck 1 and lower chuck 7 with identical revolving speed synchronous rotary, be then turned on 4 pairs of light of stretching furnace
Fine 3 lower end of prefabricated rods female rod starts to be heated, and heating temperature is 2200 DEG C, it is made to fade to semi-molten state；
The lower chuck 7 of 4 lower end of stretching furnace is only rotated, and is not moved along the vertical direction, and stretching furnace 4 moves up, so as to
It gives preform female rod 3 different position section heating, while controlling upper chuck 1 and moving up speed to light with what is be calculated
Fine prefabricated rods female rod 3 carries out stretch processing, forms plug；Meet V during the entire stretching process3=V2×(D1 2-D2 2)/D1 2,
In, V3For the real-time movement speed of upper chuck 1, V2Speed, D are moved up for preset stretching furnace 41For section optical fiber that is stretched
The diameter of prefabricated rods female rod 3, D2For diameter required for plug after stretching.
Wherein, D1、D2、V1、V2Equal parameter informations are as shown in table 3, and the geometric parameter of plug is as shown in table 4 below after stretching.
3 female rod diameter parameters of table and tensile speed parameter list
Geometric parameter after 4 plug of table stretches
It is enlightenment, through the above description, related work people with the above-mentioned desirable embodiment according to the utility model
Member can carry out various changes and amendments in the range of without departing from this item utility model technical idea completely.This item is real
It is not limited to the contents of the specification with novel technical scope, it is necessary to its technology is determined according to scope of the claims
Property range.
Claims (7)
1. a kind of preform female rod stretching device of VAD sintering, which is characterized in that including what is be sequentially arranged along the vertical direction
Upper chuck (1), stretching furnace (4), lower chuck (7)；
The upper chuck (1) can rotate and go up and down, and upper chuck (1) sandwiched is welded on the upper of preform female rod (3) upper end
Stick (2) are drawn in stretching；
The stretching furnace (4) can go up and down；
The lower chuck (7) can rotate, and the drop-down of lower chuck (7) sandwiched extends stick (6), preform female rod (3) lower end
VAD deposition target head is fixed on drop-down and extends in stick (6).
2. the preform female rod stretching device of VAD sintering according to claim 1, which is characterized in that further include surveying
Diameter instrument (5), the caliper (5) is located at below stretching furnace (4), and is connected with stretching furnace (4).
3. the preform female rod stretching device of VAD sintering according to claim 1, which is characterized in that the drop-down
Stick (6) are extended as cylinder open at one end, the barrel of the cylinder includes the thin-walled in the identical close cartridge openings direction of outer diameter
The thick wall portion in portion and separate cartridge openings direction, the internal diameter of the thinner wall section are bigger than the internal diameter of thick wall portion.
4. the preform female rod stretching device of VAD sintering according to claim 1, which is characterized in that the optical fiber
Prefabricated rods female rod (3) is that VAD deposits sintered solid core glass bar.
5. the preform female rod stretching device of VAD sintering according to claim 1, which is characterized in that the pull-up
Extend the quartz glass bar of stick (2) for diameter less than preform female rod (3).
6. the preform female rod stretching device of VAD sintering according to claim 2, which is characterized in that in caliper
(5) top is provided with for heat-insulated graphite heat insulation loop.
7. the preform female rod stretching device of VAD sintering according to claim 1, which is characterized in that the drawing
Stretching furnace (4) is graphite resistor furnace or electric induction furnace, is filled with inert protective gas in heating region when heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822158062.1U CN209456303U (en) | 2018-12-21 | 2018-12-21 | A kind of preform female rod stretching device of VAD sintering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822158062.1U CN209456303U (en) | 2018-12-21 | 2018-12-21 | A kind of preform female rod stretching device of VAD sintering |
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| Publication Number | Publication Date |
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| CN209456303U true CN209456303U (en) | 2019-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822158062.1U Active CN209456303U (en) | 2018-12-21 | 2018-12-21 | A kind of preform female rod stretching device of VAD sintering |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113651526A (en) * | 2021-08-02 | 2021-11-16 | 富通集团（嘉善）通信技术有限公司 | Machining process of core rod |
| CN113698089A (en) * | 2021-08-02 | 2021-11-26 | 浙江富通光纤技术有限公司 | Machining method of core rod |
-
2018
- 2018-12-21 CN CN201822158062.1U patent/CN209456303U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113651526A (en) * | 2021-08-02 | 2021-11-16 | 富通集团（嘉善）通信技术有限公司 | Machining process of core rod |
| CN113698089A (en) * | 2021-08-02 | 2021-11-26 | 浙江富通光纤技术有限公司 | Machining method of core rod |
| CN113698089B (en) * | 2021-08-02 | 2022-12-27 | 浙江富通光纤技术有限公司 | Machining method of core rod |
| CN113651526B (en) * | 2021-08-02 | 2023-02-10 | 富通集团（嘉善）通信技术有限公司 | Machining process of core rod |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220811 Address after: 215233 Xiaoping Avenue, eight Town, Zhen Ze town, Wujiang District, Suzhou, Jiangsu 8 Patentee after: TONGDING INTERCONNECTION INFORMATION Co.,Ltd. Patentee after: JIANGSU TONGDING OPTICAL WAND Co.,Ltd. Address before: 215000 no.583 Caizi Road, Wujiang Economic and Technological Development Zone, Suzhou City, Jiangsu Province Patentee before: JIANGSU TONGDING OPTICAL WAND Co.,Ltd. |
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| TR01 | Transfer of patent right |