CN102627399A - Vertical stretch method and device of optical fiber prefabricating rod - Google Patents
Vertical stretch method and device of optical fiber prefabricating rod Download PDFInfo
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- CN102627399A CN102627399A CN2012101138062A CN201210113806A CN102627399A CN 102627399 A CN102627399 A CN 102627399A CN 2012101138062 A CN2012101138062 A CN 2012101138062A CN 201210113806 A CN201210113806 A CN 201210113806A CN 102627399 A CN102627399 A CN 102627399A
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- fiber prefabricated
- preform
- prefabricated rods
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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
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
- C03B37/01242—Controlling or regulating the down-draw process
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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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- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention relates to a vertical stretch method and device of an optical fiber prefabricating rod. The vertical stretch method comprises the following steps: an optical fiber prefabricating rod with a large diameter is vertically arranged on a stretch device, the lower end of the optical fiber prefabricating rod is heated by a heating device, so that the optical fiber prefabricating rod is fused and thinned, and extends downwards, and an extension section is connected with to a traction device; the lower end of the optical fiber prefabricating rod with the large diameter and a transition section are continuously heated so as to be fused and thinned; meanwhile, through downward traction of the traction device at the traction speed of V2, and an optical fiber prefabricating rod with a small diameter, which extends downwards, is formed; meanwhile, a clamping device for clamping the optical fiber prefabricating rod with the large diameter moves downwards at a speed of V1, the diameter D1 of the optical fiber prefabricating rod with the large diameter is greater than or equal to 140 mm, and the diameter D2 of the optical fiber prefabricating rod with the small diameter is less than or equal to 120 mm, so that the stretch processing meets that D2 is equal to (V1/V2)1/2*D1. The method and the device, provided by the invention, have the advantages of good processing quality, simple process, easy control and adjustment, higher processing efficiency, simple structure of a processing device, reliable operation and comparability of a solid core prefabricating rod, a glass sleeve and a core rod.
Description
Technical field
The present invention relates to a kind of stretched vertically method and apparatus of preform, be specifically related to a kind of large-diameter optical fiber prefabricated stick is drawn into the process method and the equipment of smaller diameter fiber prefabricated rods, belong to the optical fiber processing technique field.
Background technology
1970, U.S. CORNING at first adopted CVD method to prepare prefabricated rods and pulled out since the optical fiber of low attenuation, has had multiple making to be used for the working method of the glass preform of drawing optical fiber at present.These working methods comprise: outer vapour deposition process (OVD), and vapour phase axial deposition technique (VAD), interior vapour deposition process (IVD) improves chemical Vapor deposition process (MCVD), plasma-activated chemical Vapor deposition process (PCVD).
In order to improve the production efficiency of optical fiber; The prefabricated rods of bigger original outer diameter and the trend of very fast drawing speed progressively appear using; Yet when external diameter MV is carried out Wire Drawing greater than the prefabricated rods of 150 mm; Be difficult to make hot-zone air-flow arrival ideal laminar flow situation and prefabricated rods is carried out even heating, therefore be unfavorable for the control of drawing process and quality.
Utilize stretching technique that large diameter preform bar stretching is become the less prefabricated rods of a kind of diameter and help solving above technical problem.Patent documentation CN 1890189A discloses a kind of method and apparatus of horizontal direction stretching optical fiber base material; But adopt this method in drawing process because the bow degree of the effect prefabricated rods of barred body self gravitation can not finely be controlled, can cause bigger trouble to the drawing optical fibers process.
Summary of the invention
Technical problem to be solved by this invention is to propose to the deficiency of above-mentioned prior art existence a kind of stretched vertically method and apparatus of the preform that quality is good, complete processing is easy that stretches.
The present invention for the technical scheme of the stretched vertically method that problem adopted of the above-mentioned proposition of solution is:
Large-diameter optical fiber prefabricated stick is vertically mounted on the stretcher, and the upper end of large-diameter optical fiber prefabricated stick is by a gripping unit clamping;
Earlier preprocessing is carried out in the lower end of preform; Form the transition section and the section of extending; Promptly through heating unit the lower end of preform is heated, its fusion is attenuated and to extending below a segment length, the smaller diameter fiber prefabricated rods diameter after the diameter of the section of extending and the processing is identical or close;
Will the section of extending access towing mechanism;
Large-diameter optical fiber prefabricated stick lower end and transition section are continued to heat, its fusion is attenuated, draw downwards through towing mechanism simultaneously, the speed of traction is V downwards
2, form thus to the smaller diameter fiber prefabricated rods that extends below;
In the traction downwards of smaller diameter fiber prefabricated rods, the gripping unit of clamping large-diameter optical fiber prefabricated stick moves down, and the speed that gripping unit moves down is V
1, keep the continuous feed of large-diameter optical fiber prefabricated stick thus to heating unit;
The diameter D1 of described large-diameter optical fiber prefabricated stick is more than or equal to 140mm, and the diameter D2 of described smaller diameter fiber prefabricated rods is less than or equal to 120mm, and makes stretch process satisfy: D2=(V
1/ V
2)
1/2* D1.
Press such scheme, described large-diameter optical fiber prefabricated stick is real core fibre prefabricated rods, or the combination of glass bushing and plug; Can prolong pipe as bare terminal end by less glass prolongation rod or the glass of weld diameter in the upper end of real core fibre prefabricated rods, or the less glass of weld diameter prolongs pipe as bare terminal end in the upper end of glass bushing.
Press such scheme, for the large-diameter optical fiber prefabricated stick by glass bushing and plug combination, install vacuum pad in the upper end of glass bushing or glass prolongation pipe, the interior vacuum degree control of pipe is at 50mbar or below the 50mbar during heat drawing.
Press such scheme, described heating unit is graphite resistor furnace or electric induction furnace, or is the gas fuel burning device, and heating and temperature control pours inert protective gas at heating region at 2000-2300 ℃ during heating.
Press such scheme, the smaller diameter fiber prefabricated rods diameter D2 that the large-diameter optical fiber prefabricated stick diameter D1 and the fusion at heating and melting place is attenuated through photoelectric measuring device continuously or be interrupted and measure, and through adjustment V
1And/or V
2Adjust D2.
Press such scheme, described towing mechanism is the roller traction device, pulling speed V
2Be 20mm/min ~ 1000mm/min.
Press such scheme, the diameter D1 of described large-diameter optical fiber prefabricated stick is 140 ~ 200 mm, and the diameter D2 of described smaller diameter fiber prefabricated rods is 40 ~ 120 mm.
The technical scheme of preform stretched vertically equipment of the present invention is:
Comprise Vertical Rack; The Vertical Rack top is installed and is moved up and down gripping unit; Move up and down gripping unit top configuration pumped vacuum systems; The middle part of Vertical Rack is installed heating unit and is disposed the rare gas element puff port, in heating unit with below dispose photoelectric measuring device respectively, below heating unit, be installed on towing mechanism.
Press such scheme, the described gripping unit that moves up and down comprises gripping unit and moves up and down device, also disposes on the device middle regulator moving up and down; Described towing mechanism is the roller traction device, and the roller traction device is made up of one or more pairs of rollers, and install on edge parallel interval up and down, comprises the pedestal fairload on top, also comprises main stretching roller, unsteady stretching roller and servo-actuated stretching roller.
Press such scheme, described pumped vacuum systems comprises vacuum pump, vacuum lead, vacuum detection instrument, vacuum pad and graphite heat shield.
Beneficial effect of the present invention is: 1, adopt vertical stretched vertically mode; Not only can avoid preform when stretching because of action of gravity produces the bow degree, the right alignment behind the preform bar stretching is guaranteed, and can be by the effect of gravity to stretched; Geometrical dimension to prefabricated rods is better controlled; Make that the optical fiber prefabricating rod geometry after stretching is more even, precision is better, for drawing optical fibers is laid good quality base; 2, complete processing is easy, is easy to control and adjustment, and easy to operate, working (machining) efficiency is higher; 3, for large-diameter optical fiber prefabricated stick by glass bushing and plug combination; Adopted the mode of vacuumizing during heat drawing; Can guarantee always that in drawing process glass bushing and plug interface are in the relative vacuum state, improve the quality of the back prefabricated rods that stretches so greatly; 4, another characteristics of the present invention are in stretching base material and Heating element, to fill rare gas element; Stablized the stability of gas flow between softening deformation part of prefabricated rods and the heating element; Make and have continual and steady convection current heat conduction between heating element and prefabricated rods; The fluctuation of the cladding diameter of prefabricated rods does not have considerable change than the starting stage after guaranteeing to stretch, the quality of the prefabricated rods after yet having guaranteed to stretch; 5, processing units is simple in structure, and serviceability is high, and is easy to use, can compatible real core prefabricated rods and the combination of glass bushing and plug, and make the suitability of equipment improve greatly.
Description of drawings
Fig. 1 is an one embodiment of the invention course of processing synoptic diagram.
The synoptic diagram that Fig. 2 vacuumizes for one embodiment of the invention.
Fig. 3 is the synoptic diagram of one embodiment of the invention diameter measurement.
Fig. 4 measures the synoptic diagram of feedback and control for one embodiment of the invention.
Fig. 5 is for moving up and down the side sectional structure chart of gripping unit part among embodiment of present device.
Fig. 6 is the structure iron of facing of heating unit among embodiment of present device and photoelectric measuring device.
Fig. 7 is the structure iron of facing of towing mechanism part among embodiment of present device.
Fig. 8 is the vacuum pad vertical view in the pumped vacuum systems among embodiment of present device.
Fig. 9 is the A-A sectional view among Fig. 8.
Embodiment
Further embodiments of the invention are further described below in conjunction with accompanying drawing.
Objective for implementation of the present invention is a large-diameter optical fiber prefabricated stick, comprises the combination of real core fibre prefabricated rods or glass bushing and plug.Implementation process is large-diameter optical fiber prefabricated stick to be stretched become the smaller diameter fiber prefabricated rods, and the external diameter of described large-diameter optical fiber prefabricated stick is generally 160 ~ 200 mm more than or equal to 140mm; The external diameter of described smaller diameter fiber prefabricated rods is generally 50 ~ 110 mm less than 120mm.
Tensile process and operation steps are:
Said large-diameter optical fiber prefabricated stick 3 is welded with prolongation rod or the prolongation pipe of external diameter less than the prefabricated rods external diameter at afterbody; Said prolongation rod or prolongation pipe are silica glass, at high temperature are welded together with large-scale optical fiber prefabricating stick, and its purpose is to reduce the consumption of subsidiary material in the drawing process; Improve the glass utilization ratio of preform simultaneously; And, make welding become easily, thereby also reduced welding cost because auxiliary glass material external diameter diminishes.The difference that the small dia that provides in the present embodiment prolongs rod outside diameter and large-diameter optical fiber prefabricated stick diameter is 25 ~ 65mm.Described small dia prolongs rod and connects with the large-diameter optical fiber prefabricated stick coaxial line, and large-diameter optical fiber prefabricated stick has straight the butt joint with the docking mode that small dia prolongs rod, butt joint of transition awl or transition arc butt joint.
Large-diameter optical fiber prefabricated stick vertically is installed on the stretcher, and the prolongation of the upper end of large-diameter optical fiber prefabricated stick rod or prolongation pipe are by moving up and down the gripping unit clamping; For large-diameter optical fiber prefabricated stick by glass bushing and plug combination, install vacuum pad 7 in the upper end that the glass prolongation of glass bushing is managed, connect through other part of vacuum pad and pumped vacuum systems; Through moving up and down gripping unit large-diameter optical fiber prefabricated stick is sent into the graphite resistor furnace as heating unit 4 slowly;, seals stove is suitable for reading the front end of large-scale optical fiber prefabricating stick after getting into graphite resistor furnace heating chamber with tightness system; Then rare gas element is transported to graphite resistor furnace heating top, chamber; Rare gas element and preform are met, and be created in the gap location mobile gas between graphite resistor furnace heating chamber and the preform, inertia comprises nitrogen, argon gas or helium; The graphite resistor furnace TR is about 2200 ℃, and temperature refers to the temperature of heating element.When objective for implementation is the combination of glass bushing and plug, pumped vacuum systems is opened; When objective for implementation is real core prefabricated rods, need not to open pumped vacuum systems.
Front end through the softening preform of heating chamber heating; After temperature reaches prefabricated rods base material melting temperature; Make a clean sweep of down the thinner smaller diameter fiber prefabricated rods of diameter from the remollescent inner cone; The smaller diameter fiber prefabricated rods is clamped downward traction with the roller of towing mechanism 2 stretch, in drawing process, move up and down gripping unit and slowly the large-diameter optical fiber prefabricated stick feeding is got into heating unit heating chamber through moving up and down device; Photoelectric measuring device as shown in Figure 3 begins to gather the external diameter data of prefabricated rods simultaneously; Wherein the big footpath photoelectric measuring device in the heating unit 5 is measured real core or is melted the major diameter prefabricated rods diameter D1 that shortens real core into by glass bushing and plug, and the path photoelectric measuring device 6 of heating unit below is measured the diameter D2 of smaller diameter fiber prefabricated rods, and the data of gathering are delivered to Operations Analysis 15; And feed back to the system that moves up and down gripping unit 1 and towing mechanism 2 through the data feedback system, by D2=(V
1/ V
2)
1/2The speed that * D1 concerns to come the real-time regulated gripping unit to move down is V
1Roller traction speed V with towing mechanism
2, reach the required acquisition stretching external diameter of smaller diameter fiber prefabricated rods afterwards, finish until stretching.
Embodiment one:
The 200mm external diameter prefabricated rods base material that stretching RIC technology is made is to the prefabricated rods of target 40-100mm external diameter.
Prefabricated rods base material frame on the frame bar system, is placed on the upper surface of base material and fixing with graphite heat shield and vacuum pad; Pumped vacuum systems opened plug reduces defectives such as interface gas line in the prefabricated rods base material that extracts the RIC200mm external diameter with the air between the surrounding layer; Heating system is opened intensification, and after temperature reached prefabricated rods base material melting temperature, base material will melt; Power system is opened, and the glass after it will be melted is clamped, and the speed through the manual regulation power system lets the oversized of prefabricated rods base material; Test macro and signal feedback system are opened, input target external diameter numerical value on the control interface, stretcher will be through the external diameter of prevision rod after power system, test macro and the next automatic control stretching of signal feedback system control, and the result is following for its record:
Embodiment two:
Utilize present device stretching external diameter to take the prefabricated rods of 80mm external diameter for the solid preform base material of 185mm external diameter,
Close vacuum pump in the drawing process, other the same cases are equally carried out heat drawing to the prefabricated rods base material, and the result is following for its record:
Stretcher of the present invention mainly is made up of following components:
Comprise steelwork Vertical Rack 20; The Vertical Rack top is installed and is moved up and down gripping unit 1; Move up and down gripping unit and comprise gripping unit 19 and move up and down device 16, wherein move up and down device and comprise guide rail and transmission driving mechanism, also dispose on the device middle regulator 17 moving up and down; Gripping unit can all around be regulated; Configuration pumped vacuum systems 18 in gripping unit top is made up of vacuum pump 9, vacuum lead, vacuum detection instrument 10, vacuum pad 7, graphite heat shield 8, and wherein vacuum pad leans on pull of vacuum that graphite heat shield and prefabricated rods base material are attached together; A water-cooled circulation device is set on the vacuum pad 7, comprises the water jacket 34 of more than half circular arc in the disk body; The two ends of water jacket are provided with cooling water intake 32 and water outlet 33 respectively, on disk body, also are provided with radially vacuum pumping hole 31, communicate with the cavity at vacuum pad middle part; The middle part of Vertical Rack is installed heating unit 4 and is disposed the rare gas element puff port; Heating unit is installed on the bracing frame 24 through drop-bottom support 22; Heating unit is a graphite resistor furnace; Partly be made up of left and right sides X-former, upper/lower electrode, graphite piece, furnace shell etc., it mainly act as the prefabricated rods heating thermal source is provided, and thermal source requires the temperature field even; In heating unit with below dispose photoelectric measuring device 21 respectively; Comprise big footpath photoelectric measuring device 5 and path photoelectric measuring device 6; Big footpath photoelectric measuring device 5 is calibrated optical transmitting set 11 and is calibrated optical receiver 12 formations; Path photoelectric measuring device 6 constitutes by calibrating optical transmitting set 13 for a short time and calibrating optical receiver 14 for a short time; Be used for diameter measurement, the measurement of configurable in addition measurement of furnace temperature, prefabricated rods melting zone quartz temperature, the voltage measurement system of graphite piece upper/lower electrode to prefabricated rods heating zone different zones; Below heating unit, also be installed on towing mechanism, described towing mechanism 2 is the roller traction device, comprises roller bracing frame 25 and rolls road adjustment mechanism 29; The roller traction device is made up of one or more pairs of rollers, and install on edge parallel interval up and down, comprises the pedestal fairload 23 on top; Pedestal fairload at first contacts the prefabricated rods that stretches out from fire door, makes it guarantee good locus, also comprises main stretching roller 26, stretching roller 27 and servo-actuated stretching roller 28 float; The roller that initiatively stretches passes through Operations Analysis 15 computings with draw speed, stretching moment of torsion, forms closed loop feedback with measuring apparatus, the real-time and dynamic adjustment; Guarantee the accurate of processing parameter; The product that output is qualified, the stretching roller that floats, the weight of the prefabricated rods that stretches out according to different time sections; Play effect of lifting and poising action, be beneficial to the online cutting of prefabricated rods and cut.
Claims (10)
1. the stretched vertically method of a preform is characterized in that
Large-diameter optical fiber prefabricated stick is vertically mounted on the stretcher, and the upper end of large-diameter optical fiber prefabricated stick is pressed from both sides by a gripping unit
Hold;
Earlier preprocessing is carried out in the lower end of preform; Form the transition section and the section of extending; Promptly through heating unit the lower end of preform is heated, its fusion is attenuated and to extending below a segment length, the smaller diameter fiber prefabricated rods diameter after the diameter of the section of extending and the processing is identical or close;
Will the section of extending access towing mechanism;
Large-diameter optical fiber prefabricated stick lower end and transition section are continued to heat, its fusion is attenuated, draw downwards through towing mechanism simultaneously, the speed of traction is V downwards
2, form thus to the smaller diameter fiber prefabricated rods that extends below;
In the traction downwards of smaller diameter fiber prefabricated rods, the gripping unit of clamping large-diameter optical fiber prefabricated stick moves down, and the speed that gripping unit moves down is V
1, keep the continuous feed of large-diameter optical fiber prefabricated stick thus to heating unit;
The diameter D1 of described large-diameter optical fiber prefabricated stick is more than or equal to 140mm, and the diameter D2 of described smaller diameter fiber prefabricated rods is less than or equal to 120mm, and makes stretch process satisfy: D2=(V
1/ V
2)
1/2* D1.
2. by the stretched vertically method of the described preform of claim 1, it is characterized in that described large-diameter optical fiber prefabricated stick is the combination of real core fibre prefabricated rods or glass bushing and plug; Less glass prolongation rod or the glass of weld diameter prolongs pipe as bare terminal end in the upper end of real core fibre prefabricated rods, or the less glass of weld diameter prolongs pipe as bare terminal end in the upper end of glass bushing.
3. press the stretched vertically method of the described preform of claim 2; It is characterized in that for large-diameter optical fiber prefabricated stick by glass bushing and plug combination; Vacuum pad is installed in upper end at glass bushing or glass prolongation pipe, and the interior vacuum degree control of pipe is at 50mbar or below the 50mbar during heat drawing.
4. press the stretched vertically method of claim 1 or 2 described preforms; It is characterized in that described heating unit is graphite resistor furnace or electric induction furnace; Or be the gas fuel burning device, heating and temperature control pours inert protective gas at heating region at 2000-2300 ℃ during heating.
5. press the stretched vertically method of claim 1 or 2 described preforms; The smaller diameter fiber prefabricated rods diameter D2 that it is characterized in that the large-diameter optical fiber prefabricated stick diameter D1 and the fusion at heating and melting place being attenuated through photoelectric measuring device continuously or be interrupted and measure, and through adjustment V
1And/or V
2Adjust D2.
6. by the stretched vertically method of the described preform of claim 1, it is characterized in that described towing mechanism is the roller traction device, pulling speed V
2Be 20mm/min ~ 1000mm/min.
7. by the stretched vertically method of claim 1 or 2 described preforms, the diameter D1 that it is characterized in that described large-diameter optical fiber prefabricated stick is 140 ~ 200 mm, and the diameter D2 of described smaller diameter fiber prefabricated rods is 40 ~ 120 mm.
8. the stretched vertically equipment of a preform; It is characterized in that comprising Vertical Rack; The Vertical Rack top is installed and is moved up and down gripping unit, moves up and down gripping unit top configuration pumped vacuum systems, and the middle part of Vertical Rack is installed heating unit and disposed the rare gas element puff port; In heating unit with below dispose photoelectric measuring device respectively, below heating unit, also be installed on towing mechanism.
9. by the stretched vertically equipment of the described preform of claim 8, it is characterized in that the described gripping unit that moves up and down comprises gripping unit and moves up and down device, also dispose moving up and down on the device middle regulator.
10. press the stretched vertically equipment of claim 8 or 9 described preforms; It is characterized in that described towing mechanism is the roller traction device; The roller traction device is made up of one or more pairs of rollers; Install on edge parallel interval up and down, comprises the pedestal fairload on top, also comprises main stretching roller, unsteady stretching roller and servo-actuated stretching roller.
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|---|---|---|---|
| CN201210113806.2A CN102627399B (en) | 2012-04-18 | 2012-04-18 | Vertical stretch method and device of optical fiber prefabricating rod |
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|---|---|---|---|
| CN201210113806.2A CN102627399B (en) | 2012-04-18 | 2012-04-18 | Vertical stretch method and device of optical fiber prefabricating rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102849937A (en) * | 2012-09-07 | 2013-01-02 | 长飞光纤光缆有限公司 | Large-size solid optical fiber preform, preparation method and apparatus thereof |
| US20130291601A1 (en) * | 2012-05-02 | 2013-11-07 | Shin-Etsu Chemical Co., Ltd. | Glass base material elongating method and glass base material elongating apparatus |
| CN105217951A (en) * | 2015-09-21 | 2016-01-06 | 长飞光纤光缆股份有限公司 | A kind of stretched vertically method and apparatus of preform |
| CN105540037A (en) * | 2016-01-21 | 2016-05-04 | 苏州沃森优金电子科技有限公司 | Optical fiber preform and storage rack |
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