CN103951181A - Casing pipe prefabrication rod with improved structure and manufacturing method of prefabrication rod - Google Patents
Casing pipe prefabrication rod with improved structure and manufacturing method of prefabrication rod Download PDFInfo
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- CN103951181A CN103951181A CN201410154728.XA CN201410154728A CN103951181A CN 103951181 A CN103951181 A CN 103951181A CN 201410154728 A CN201410154728 A CN 201410154728A CN 103951181 A CN103951181 A CN 103951181A
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- sleeve pipe
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- caudal peduncle
- dribbling
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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
Abstract
The invention relates to a casing pipe prefabrication rod with an improved structure and a manufacturing method of the casing pipe prefabrication rod as well as a technology for manufacturing optical fibers by adopting a core rod and casing pipe type optical fiber prefabrication rod process. The technology can effectively avoid the influence on optical fiber water peak parameters caused by wire-drawing operation and improve geometric characteristics of the optical fibers. The improved casing pipe prefabrication rod comprises a core rod assembly and a casing pipe assembly, wherein the core rod assembly is vertically inserted into the casing pipe assembly to form the casing pipe prefabrication rod and comprises a core rod, a transitional tail handle and a tail handle with a ball; the lower part of the core rod is tapered, and the upper part of the core rod is connected with the transitional tail handle; the upper part of the transitional tail handle is connected with the tail handle with the ball; the tail handle with the ball is provided with a ball body; the casing pipe assembly comprises a casing pipe, a transitional pipe, a positioning tail pipe and a chuck tail pipe; the lower part of the casing pipe is tapered, the conical top end of the casing pipe is cut away to form a vent hole, and the upper part of the casing pipe is connected with the transitional pipe; the upper part of the transitional pipe is connected with the positioning tail pipe; the upper part of the positioning tail pipe is flared, is set to be horn-shaped and is connected with the chuck tail pipe.
Description
Technical field
The present invention relates to a kind of sleeve pipe prefabricated rods and manufacture method thereof of structure-improved, also relate to a kind of technology of using preform technique that plug adds sleeve pipe to manufacture optical fiber, this technology can effectively avoid that wire-drawing operation causes optical fiber water peak parameter impact, improve the geometrical property of optical fiber simultaneously.
Background technology
The manufacturing processed of optical fiber generally includes 3 operations: the 1) manufacture of plug, 2) manufacture of surrounding layer, 3) high temperature wire drawing manufactures optical fiber.The surrounding layer technology that adds of main flow has at present: outsourcing sedimentation (OVD), sleeve pipe melt contracting method (RIT) and sleeve pipe fiber elongation method (RIC).Wherein, sleeve pipe drawing process unites two into one outsourcing and wire drawing, because the advantages such as its technique simple and flexible, equipment investment are low, be suitable for various size prefabricated rods are widely used.
The flow process of sleeve pipe drawing process mainly can be divided into following step: (1) thimble assembly is made and tail end draws cone; (2) mandrel component is made; (3) mandrel component inserts in thimble assembly and is assembled into prefabricated rods assembly; (4) the prefabricated rod assembly of melting carry out wire drawing under 2000 DEG C of left and right high temperature.For air and moisture content except in Decanning, ensure simultaneously sleeve pipe and plug in the time that wire-drawing operation is melted into one without the gentle line of bubble, must vacuumize processing to sleeve pipe.
Existing prefabricated rod assembly generally adopts in assembling: plug one lower end is contacted with sleeve pipe tapered portion, and top is used specific tightness system to fix, and to vacuumizing processing (as shown in Figure 1) in sleeve pipe one.This clamping method is not only installed loaded down with trivial details, complicated operation; And very difficult plug one (12) and the right alignment of sleeve pipe one (13) and the gap homogeneity between the two of ensureing.The sleeve pipe prefabricated rods that these problems are made existing assembling mode easily causes between sandwich layer and covering and produces concentricity deviation in the time of drawing optical fiber, thereby easily occurs gas line and bubble.In addition, in existing thimble assembly making processes, if adopt oxyhydrogen blowtorch to draw cone, water vapor will enter sleeve pipe one, and is condensed into liquid water stain at inside pipe wall.Because sleeve pipe one now has sealed, the interior gas of sleeve pipe one cannot circulate, and these moisture content just cannot be removed; In drawing process, these moisture content can have a strong impact on fiber products quality, cause 1383nm decay in optical fiber to increase.
Summary of the invention
The object of the invention is the weak point existing for above-mentioned existing sleeve pipe drawing process, a kind of sleeve pipe prefabricated rods and manufacture method thereof of structure-improved is provided, a kind of technology of using preform technique that plug adds sleeve pipe to manufacture optical fiber is also provided.That one realizes autocollimating sleeve pipe prefabricated rods assembly method with plug gravity, and the method for the interior moisture content of a kind of effective removal sleeve pipe.The present invention can effectively avoid that wire-drawing operation causes optical fiber water peak parameter impact, improve the geometrical property of optical fiber simultaneously.
The sleeve pipe prefabricated rods of a kind of structure-improved of the present invention and manufacture method thereof are to take following technical scheme to realize:
A kind of sleeve pipe prefabricated rods of structure-improved is made up of mandrel component, thimble assembly; When assembling, mandrel component is inserted in thimble assembly in vertical direction, form the sleeve pipe prefabricated rods in the present invention.
Mandrel component comprises plug, excessively caudal peduncle and dribbling caudal peduncle.Cone is drawn in plug bottom, and top is connected with excessive caudal peduncle; Excessively caudal peduncle top connects dribbling caudal peduncle; Dribbling caudal peduncle is provided with spheroid, and its bulb cuts out four ventilating groove 23-2, the circular diameter of cutting after ventilating groove consistent with dribbling caudal peduncle upper and lower part diameter (being the poor of the depth of cut cross section radius of circle that equals bulb and the caudal peduncle upper and lower part of dribbling).
Thimble assembly comprises sleeve pipe, transition conduit, location tail pipe and chuck tail pipe.Sleeve pipe bottom is drawn into taper, and excises tapered tip position, forms the ventilating pit of 2 ~ 10mm left and right, and sleeve pipe top is connected with transition conduit; Transition conduit top is connected with location tail pipe; Enlarging processing is carried out on tail pipe top, location, is set to hydraucone shape, and is connected with chuck tail pipe.
The spheroid of described dribbling caudal peduncle contacts with the inwall of enlarging caudal peduncle.
The present invention solves core covering concentricity and the designed technical scheme of the inhomogeneity problem in gap, the mode that adopts the spheroid of dribbling caudal peduncle to contact with the inwall of enlarging caudal peduncle, just can realize the function of its automatic centering according to the action of gravity of plug self, thereby ensure the concentricity of plug and sleeve pipe.
Below the detailed description of each partial design:
Described plug: the scope of its external diameter OD1 is: 5 ~ 60mm, the scope of length L 1 is: 300 ~ 3000mm is deposited sintering and is made on core rod lathe by Glass tubing.
Described sleeve pipe: the scope of its inner diameter, ID 4 is: (OD1+1) ~ (OD1+6) mm, length L 4 scopes are: L4 >=(L1+20) mm, external diameter OD4 is determined by the design of optical fiber.
Described excessive caudal peduncle: for connecting plug and dribbling caudal peduncle, the scope of its external diameter OD2 is: OD2≤(ID4-2) mm.
Described excessive pipe: in drawing process, while entering fiber drawing furnace for fear of transition conduit,, because airflow fluctuation affects fiber products quality, it is close with the external diameter of sleeve pipe that its external diameter OD5 should try one's best, and the scope of OD5 is:
|oD5-OD1
|/oD1≤3%, the scope of inner diameter, ID 5 is: (OD5-6) ~ (ID4+2) mm, its length L 5 is determined by the design of fiber drawing furnace hot-zone and the length of its upper end muffle tube.
Described dribbling caudal peduncle: detailed structure as shown in Figure 3, the scope of its ball external diameter ODB is: ODB >=(OD1+6) mm, the scope of ball both sides quartz handle external diameter OD3 is: OD3≤(ODB-8) mm, this caudal peduncle lower length is suitable at 100 ~ 200 mm, and spheroid top quartz handle length determines according to the length of vacuum extractor and sleeve pipe caudal peduncle; Concrete making method is as follows: the glass stick of selected external diameter is slowly softening through high temperature sintering on glass work lathe, to third side to mobile one end chuck, the glass at its high temperature place is extruded to formation spherical; After cooling in the enterprising step processing of mechanical lathe, to reach corresponding tolerance; After machining, re-use cutting machine and cut out four symmetrical ventilating grooves at spherical place, the circular diameter of cutting after ventilating groove consistent with top and the bottom diameter (being the poor of the depth of cut cross section radius of circle that equals bulb and top and the bottom), width 1 ~ 4mm; Cutting needs to ensure the neat of otch, forbids to produce the phenomenon such as chipping, gap, carries out flame polish after cutting; The processing of dribbling caudal peduncle need to be controlled two form and position tolerances: the 1. right alignment of spheroid two ends glass stick, is controlled in Φ 0.2mm; 2. the circularity of spheroid, is controlled in Φ 0.1mm.
Described chuck tail pipe: the scope of its inner diameter, ID 7 is: ID7 >=(ODB+2) mm.In order to keep out the clamping force of chuck, need to ensure enough structural strengths, the scope of external diameter OD7 is: OD7 >=(ID7+10) mm.Its length L 7 is according to the determining positions of the length of chucks and vacuum extractor, and the scope of L7 is 250 ~ 650mm.
Described location tail pipe: scope (Max (OD1, OD3)+3) mm ~ (ODB-4) mm of its inner diameter, ID 6.Its external diameter OD6 scope: (ID6+5) ~ Min (OD5, OD7).Enlarging external diameter in upper end is consistent with chuck tail pipe external diameter, and enlarging external diameter in lower end is with excessively pipe external diameter is consistent.Its length L 6 is determined by the minimum allowable range of chuck and fiber drawing furnace, scope >=150mm of L6.
A kind of manufacture method of sleeve pipe prefabricated rods of structure-improved takes following steps to realize:
One, the making flow process of mandrel component:
(1) make plug: on core rod lathe, be made into plug through deposition after sintering, its underpart is pulled into taper, can use in testing tool precast rod refractivity detecting and analysing system (P104, PK2600) test passes after cooling.
(2) select excessive caudal peduncle: select the glass stick of corresponding size according to the external diameter of plug and length, as excessive caudal peduncle.
(3) make dribbling caudal peduncle: according to the selected glass stick high temperature sintering on glass work lathe of the size of plug, slowly softening, to third side to mobile one end chuck, the glass at its high temperature place is extruded to formation spherical; After cooling in the enterprising step processing of mechanical lathe, to reach corresponding tolerance; After machining, re-use cutting machine and cut out four symmetrical ventilating grooves at spherical place, the circular diameter of cutting after ventilating groove consistent with top and the bottom diameter (being the poor of the depth of cut cross section radius of circle that equals bulb and top and the bottom), width 1 ~ 4mm; Cutting needs to ensure the neat of otch, forbids to produce the phenomenon such as chipping, gap, carries out flame polish after cutting; The processing of dribbling caudal peduncle need to be controlled two form and position tolerances: the 1. right alignment of spheroid two ends glass stick, is controlled in Φ 0.2mm; 2. the circularity of spheroid, is controlled in Φ 0.1mm.
(4) mandrel component welding: dribbling target rod bottom and excessively pipe welding mutually, excessively manage bottom and be welded with plug, form mandrel component; After having welded, carry out alignment operation, require its overall bow degree must be less than 0.5mm/m(optimized scope and require to be less than 0.1mm/m).
Two, the making flow process of thimble assembly:
(1) make sleeve pipe: according to the sleeve pipe of the external diameter of plug and length selection corresponding size, sleeve pipe bottom is drawn into taper, and excises tapered tip position, form the ventilating pit of 2 ~ 10mm left and right.
(2) select excessively pipe: the excessive pipe of selecting corresponding size according to the requirement of design.
(3) make location tail pipe: enlarging processing is carried out in tail pipe top, location, be set to hydraucone shape, ensure that hydraucone external diameter and chuck tail pipe external diameter are consistent, the angle of enlarging approximately 45 degree; Bottom determines whether to carry out enlarging processing according to the external diameter of excessive pipe, needs to ensure that external diameter is between the two consistent.
(4) select chuck tail pipe: the chuck tail pipe of selecting corresponding size according to the requirement of design.
(5) thimble assembly welding: will locate tail pipe top and weld mutually with chuck tail pipe, bottom and excessively pipe welding mutually, excessively manage bottom and weld mutually with sleeve pipe, forms thimble assembly; Thimble assembly is carried out to alignment operation, require its bow degree must be less than 1mm/m(optimized scope and require to be less than 0.5mm/m).
Three, the assembling of mandrel component and thimble assembly:
Mandrel component and the timing of thimble assembly integral installation, should ensure in vertical direction plug to be inserted in sleeve pipe as far as possible, avoids causing because of the collision of plug and internal surface of sleeve pipe, friction the scuffing of glass surface.
Now the impetus of plug is the spheroid outside of dribbling caudal peduncle, and the spheroid of dribbling caudal peduncle contacts with the inwall of enlarging caudal peduncle, under the effect of gravity, just can realize the autocollimating effect of plug, makes a kind of sleeve pipe prefabricated rods of structure-improved.
A kind of method that sleeve pipe prefabricated rods of structure-improved is manufactured optical fiber is as follows:
The sleeve pipe prefabricated rods of the structure-improved after assembling is completed is carried out clamping by the chuck of wire-drawer-tower and is fixed, to fiber drawing furnace heat temperature raising, in the time that temperature rises to 1850～1950 DEG C, by preform cone head slow decreasing to wire drawing fire door preheating 3 ~ 5 minutes; Determine lower excellent distance according to fiber drawing furnace hot-zone apart from fire door length, then preform cone subordinate is down to the hot-zone place of fiber drawing furnace; After prefabricated rods heating 3 ~ 5 minutes, start vacuum pump, to the sleeve pipe operation of bleeding, remove the water vapour that inside pipe casing produces because of welding.Treat the aperture completely dissolve of prefabricated rods conehead, start wire-drawing operation, make optical fiber.
In order to avoid to greatest extent drawing process to increase the water peak in optical fiber, in the drawing process after the ventilating pit on sleeve pipe lower taper top disappears, the absolute pressure of inside pipe casing need ensure lower than 50mbar.
The invention has the advantages that: 1, have wide range of applications, the plug of applicable different size scope and sleeve pipe.2, because dribbling caudal peduncle is provided with spheroid, tangent with location, outside tail pipe, under action of gravity, can realize the autocollimating function of plug, can optimize the concentricity parameter of plug and sleeve pipe, improve optical fiber quality; 3,, because the top at sleeve pipe is provided with ventilating pit, can effectively solve the difficult problem that in sleeve pipe, moisture content cannot be removed; 4, the assembling of plug and sleeve pipe is simpler and easy, easy to operate, and while greatly reducing dress rod, operator's the adjusting time, has improved production efficiency.
Brief description of the drawings
Below with reference to accompanying drawing, the invention will be further described:
Accompanying drawing 1 is the structural representation for existing sleeve pipe prefabricated stick drawn wire technique.
In figure: 11, plug one, 12, caudal peduncle, 13, sleeve pipe one, 14, excessively manage one, 15, chuck tail pipe one.
Accompanying drawing 2 is structural representations that the sleeve pipe prefabricated rods of structure-improved of the present invention is improved rear sleeve prefabricated stick drawn wire technique.
In figure: 21, plug, 22, excessive caudal peduncle, 23, dribbling caudal peduncle, 24, sleeve pipe, 25, excessive pipe, 26, location tail pipe, 27, chuck tail pipe.
Accompanying drawing 3 is dribbling caudal peduncle structural representations of the sleeve pipe prefabricated rods of structure-improved of the present invention.
Accompanying drawing 4 is ventilating groove structural representations of the spheroid of the dribbling caudal peduncle of the sleeve pipe prefabricated rods of structure-improved of the present invention.
Accompanying drawing 5 is device schematic diagram that the present invention removes moisture content between plug and sleeve pipe:
In figure: 21, plug, 24, sleeve pipe, 43, fiber drawing furnace, 44, graphite piece.
Embodiment
With reference to accompanying drawing 1～5, a kind of sleeve pipe prefabricated rods of structure-improved is made up of mandrel component, thimble assembly; When assembling, mandrel component is inserted in thimble assembly in vertical direction, form the sleeve pipe prefabricated rods in the present invention.Both concrete composition and mutual relationship are as follows:
Mandrel component comprises plug 21, excessively caudal peduncle 22 and dribbling caudal peduncle 23.Cone is drawn in plug 21 bottoms, and top is connected with excessive caudal peduncle 22; Excessively caudal peduncle 22 tops connect dribbling caudal peduncle 23; Dribbling caudal peduncle 23 is provided with spheroid (23-1), and its bulb cuts out four ventilating groove 23-2, the circular diameter of cutting after ventilating groove consistent with top and the bottom diameter (being the poor of the depth of cut cross section radius of circle that equals bulb and top and the bottom).
Thimble assembly comprises sleeve pipe 24, transition conduit 25, location tail pipe 26 and chuck tail pipe 27.Sleeve pipe 24 bottoms are drawn into taper, and excise tapered tip position, form the ventilating pit of 2 ~ 10mm left and right, and sleeve pipe 24 tops are connected with transition conduit 25; Transition conduit 25 tops are connected with location tail pipe 26; Enlarging processing is carried out on tail pipe 26 tops, location, is set to hydraucone shape, and is connected with chuck tail pipe 27.
The spheroid of described dribbling caudal peduncle (23) contacts with the inwall of enlarging caudal peduncle (26).
Fig. 2 is that the present invention solves core covering concentricity and the designed technical scheme of the inhomogeneity problem in gap, the mode that adopts the spheroid of dribbling caudal peduncle (23) to contact with the inwall of enlarging caudal peduncle (26), just can realize the function of its automatic centering according to the action of gravity of plug (21) self, thereby ensure the concentricity of plug and sleeve pipe.
Below the detailed description of each partial design:
Described plug (21): the scope of its external diameter OD1 is: 5 ~ 60mm, the scope of length L 1 is: 300 ~ 3000mm is deposited sintering and is made on core rod lathe by Glass tubing.
Described sleeve pipe (24): the scope of its inner diameter, ID 4 is: (OD1+1) ~ (OD1+6) mm, length L 4 scopes are: L4 >=(L1+20) mm, external diameter OD4 is determined by the design of optical fiber.
Described excessive caudal peduncle (22): for connecting plug (21) and dribbling caudal peduncle (23), the scope of its external diameter OD2 is: OD2≤(ID4-2) mm.
Described excessive pipe (25): in drawing process, while entering fiber drawing furnace for fear of transition conduit (25),, because airflow fluctuation affects fiber products quality, it is close with the external diameter of sleeve pipe (24) that its external diameter OD5 should try one's best, and the scope of OD5 is:
|oD5-OD1
|/oD1≤3%, the scope of inner diameter, ID 5 is: (OD5-6) ~ (ID4+2) mm, its length L 5 is determined by the design of fiber drawing furnace hot-zone and the length of its upper end muffle tube.
Described dribbling caudal peduncle (23): detailed structure as shown in Figure 3, the scope of its ball external diameter ODB is: ODB >=(OD1+6) mm, the scope of ball both sides quartz handle external diameter OD3 is: OD3≤(ODB-8) mm, this caudal peduncle lower length is suitable at 100 ~ 200 mm, and spheroid top quartz handle length determines according to the length of vacuum extractor and sleeve pipe caudal peduncle (24); Concrete making method is as follows: the glass stick of selected external diameter is slowly softening through high temperature sintering on glass work lathe, to third side to mobile one end chuck, the glass at its high temperature place is extruded to formation spherical; After cooling in the enterprising step processing of mechanical lathe, to reach corresponding tolerance; After machining, re-use cutting machine and cut out four symmetrical ventilating grooves at spherical place, the degree of depth of groove is consistent with the rod outside diameter of top and the bottom, width 1 ~ 4mm; Cutting needs to ensure the neat of otch, forbids to produce the phenomenon such as chipping, gap, carries out flame polish after cutting; The processing of dribbling caudal peduncle need to be controlled two form and position tolerances: the 1. right alignment of spheroid two ends glass stick, is controlled in Φ 0.2mm; 2. the circularity of spheroid, is controlled in Φ 0.1mm.
Described chuck tail pipe (27): the scope of its inner diameter, ID 7 is: ID7 >=(ODB+2) mm.In order to keep out the clamping force of chuck, need to ensure enough structural strengths, the scope of external diameter OD7 is: OD7 >=(ID7+10) mm.Its length L 7 is according to the determining positions of the length of chucks and vacuum extractor, and the scope of L7 is 250 ~ 650mm.
Described location tail pipe (26): scope (Max (OD1, OD3)+3) mm ~ (ODB-4) mm of its inner diameter, ID 6.Its external diameter OD6 scope: (ID6+5) ~ Min (OD5, OD7).Enlarging external diameter in upper end is consistent with chuck tail pipe (27) external diameter, and enlarging external diameter in lower end is with excessively pipe (25) external diameter is consistent.Its length L 6 is determined by the minimum allowable range of chuck and fiber drawing furnace, scope >=150mm of L6.
A kind of manufacture method of sleeve pipe prefabricated rods of structure-improved takes following steps to realize:
One, the making flow process of mandrel component:
(1) make plug 21: on core rod lathe, be made into plug 21 through deposition after sintering, its underpart is pulled into taper, can use in testing tool precast rod refractivity detecting and analysing system (P104, PK2600) test passes after cooling.
(2) select excessive caudal peduncle 22: select the glass stick of corresponding size according to the external diameter of plug 21 and length, as excessive caudal peduncle 22.
(3) make dribbling caudal peduncle 23: according to the selected glass stick high temperature sintering on glass work lathe of the size of plug 21, slowly softening, to third side to mobile one end chuck, the glass at its high temperature place is extruded to formation spherical; After cooling in the enterprising step processing of mechanical lathe, to reach corresponding tolerance; After machining, re-use cutting machine and cut out four symmetrical ventilating grooves at spherical place, the circular diameter of cutting after ventilating groove consistent with dribbling caudal peduncle upper and lower part diameter (being the poor of the depth of cut cross section radius of circle that equals bulb and the caudal peduncle upper and lower part of dribbling), width 1 ~ 4mm; Cutting needs to ensure the neat of otch, forbids to produce the phenomenon such as chipping, gap, carries out flame polish after cutting; The processing of dribbling caudal peduncle need to be controlled two form and position tolerances: the 1. right alignment of spheroid two ends glass stick, is controlled in Φ 0.2mm; 2. the circularity of spheroid, is controlled in Φ 0.1mm.
(4) mandrel component welding: dribbling target rod 23 bottoms and excessively pipe 22 welding mutually, excessively manage 22 bottoms and be welded with plug 22, form mandrel component; After having welded, carry out alignment operation, require its overall bow degree must be less than 0.5mm/m(optimized scope and require to be less than 0.1mm/m).
Two, the making flow process of sleeving core rod assembly:
(1) make sleeve pipe 24: according to the sleeve pipe 24 of the external diameter of plug 21 and length selection corresponding size, sleeve pipe 24 bottoms are drawn into taper, and excise tapered tip position, form the ventilating pit of 2 ~ 10mm left and right.
(2) select excessively pipe 25: the excessive pipe of selecting corresponding size according to the requirement of design.
(3) make location tail pipe 26: enlarging processing is carried out in tail pipe 26 tops in location, be set to hydraucone shape, ensure that hydraucone external diameter and chuck tail pipe 27 external diameters are consistent, the angle of enlarging approximately 45 degree; Bottom determines whether to carry out enlarging processing according to the external diameter of excessively managing 25, needs to ensure that external diameter is between the two consistent.
(4) select chuck tail pipe 27: the chuck tail pipe of selecting corresponding size according to the requirement of design.
(5) thimble assembly welding: will locate tail pipe 26 tops and weld mutually with chuck tail pipe 27, bottom and excessively pipe 25 welding mutually, excessively manage 25 bottoms and weld mutually with sleeve pipe 24, forms thimble assembly; Thimble assembly is carried out to alignment operation, require its bow degree must be less than 1mm/m(optimized scope and require to be less than 0.5mm/m).
Three, the assembling of mandrel component and thimble assembly:
Mandrel component and the timing of thimble assembly integral installation, should ensure in vertical direction plug to be inserted in sleeve pipe as far as possible, avoids causing because of the collision of plug and internal surface of sleeve pipe, friction the scuffing of glass surface.
Now the impetus of plug is the spheroid outside of dribbling caudal peduncle (23), the spheroid of dribbling caudal peduncle (23) contacts with the inwall of enlarging caudal peduncle (26), under the effect of gravity, just can realize the autocollimating effect of plug (22), make a kind of sleeve pipe prefabricated rods of structure-improved.
A kind of method that sleeve pipe prefabricated rods of structure-improved is manufactured optical fiber is as follows:
The sleeve pipe prefabricated rods of the structure-improved after assembling is completed is carried out clamping by the chuck of wire-drawer-tower and is fixed, to fiber drawing furnace (43) heat temperature raising, in the time that temperature rises to 1800～1950 DEG C of left and right, by preform cone head slow decreasing to wire drawing fire door preheating 3 ~ 5 minutes; Determine lower excellent distance according to fiber drawing furnace hot-zone apart from fire door length, then preform cone subordinate is down to the hot-zone place of fiber drawing furnace; After prefabricated rods heating 3 ~ 5 minutes, start vacuum pump, to sleeve pipe 24 operation of bleeding, remove the water vapour that sleeve pipe 24 inside produce because of welding.Treat the aperture completely dissolve of prefabricated rods conehead, start wire-drawing operation, make optical fiber.
In order to avoid to greatest extent drawing process to increase the water peak in optical fiber, in the drawing process after the ventilating pit on sleeve pipe lower taper top disappears, the absolute pressure of inside pipe casing need ensure lower than 50mbar.
Embodiment:
The Powder Rod that a VAD technique is made is made a plug after oversintering, once extension and surface treatment.Calculating its cored ratio according to the refractive index profile of measuring is 4.53.Plug is again extended and is made into 2 plugs: plug A and plug B: the external diameter of plug A is 44.7 mm, length 1500mm.Adopt OVD method to carry out outsourcing this plug, make prefabricated rods, its external diameter is 145mm.Again this prefabricated rods is carried out to wire-drawing operation, be made into the G652 optical fiber of standard.
The external diameter OD1 of plug (21) B is 18.3mm, and length L 1 is 1000 mm; Excessively caudal peduncle (22) external diameter OD3 is 18mm, and length L 3 is 450mm; The rod outside diameter OD3 of dribbling caudal peduncle (23) is 20mm, and ball external diameter ODB is 32mm, and lower length is 170mm, and upper length is 390mm.
Sleeve pipe (24) uses HeraeusF300 (hydroxyl <1 ppm) quartz socket tube, casing inner diameter ID4=20.5mm, external diameter OD4=60mm, length L 4=1050mm; Excessively pipe (25) inner diameter, ID 5=50mm, external diameter OD5=60mm, length L 5=450mm.Location tail pipe (26) external diameter OD6=32mm, inner diameter, ID 6=25mm, length L 6=200mm; Chuck tail pipe (27) external diameter OD7=60mm, inner diameter, ID 7=44mm, length L 7=450mm.
1. mandrel component is made: first on glass work lathe, plug, excessively caudal peduncle and dribbling caudal peduncle are distinguished to alignment, make its bow degree all be less than 0.1mm/m.Then will dribble caudal peduncle, excessively caudal peduncle and plug is integrally welded successively.Finally mandrel component entirety is carried out to alignment, make its bow degree in 0.1mm/m.By the mandrel component of making, in 35% hydrofluoric acid, soak 8 hours, the plug external diameter after corrosion is OD1=17.9 mm.
2. thimble assembly is made: enlarging processing is carried out in tail pipe one end, location, be set to hydraucone shape, ensure that hydraucone external diameter and chuck tail pipe external diameter are consistent, the angle of enlarging approximately 45 degree.Flared end and chuck tail pipe are welded mutually, and the other end is with excessively pipe is integrally welded.Excessively weld mutually with sleeve pipe the bottom of pipe, forms thimble assembly.Thimble assembly is carried out to alignment operation, to reach the requirement of bow degree in 0.5mm/m.The heating of sleeve pipe bottom is drawn into pointed cone shape, and excises position, Jian Zui top, the ventilating pit of an about 4mm is set.Finally the thimble assembly of having manufactured is cleaned 1 hour in 15% hydrofluoric acid, then be dried after cleaning with pure water.
3. thimble assembly and mandrel component are assembled.In assembling process, should ensure as far as possible in vertical direction, plug to be inserted in sleeve pipe, avoid causing because of plug and internal surface of sleeve pipe collision, friction etc. the scuffing of glass surface.Now the impetus of plug is the spheroid outside of dribbling caudal peduncle (23), the spheroid of dribbling caudal peduncle (23) contacts with the inwall of enlarging caudal peduncle (26), under the effect of gravity, plug (22) gets final product autocollimation, makes a kind of sleeve pipe prefabricated rods of structure-improved.
A kind of method that sleeve pipe prefabricated rods of structure-improved is manufactured optical fiber is as follows: the prefabricated rods assembly after assembling is completed carries out clamping by the chuck of wire-drawer-tower to be fixed, first fiber drawing furnace (43) is carried out to preheating, treat that temperature rises to 800 DEG C of left and right, carries out baker 15min; Heat temperature raising again, treats that temperature rises to 1950 DEG C of left and right, by preform cone head slow decreasing to wire drawing fire door; Determine lower excellent distance according to fiber drawing furnace hot-zone apart from fire door length, then preform cone subordinate is down to 44 places, hot-zone of fiber drawing furnace; After prefabricated rods heating 3 ~ 5 minutes, start vacuum pump, to the sleeve pipe operation of bleeding, remove the water vapour that inside pipe casing produces because of welding.Treat the aperture completely dissolve of prefabricated rods conehead, start wire-drawing operation, make optical fiber.In drawing process, vacuum tightness requires to remain in absolute pressure 50mbar.
Respectively the optical fiber of plug A and plug B pull-out is tested, test data is shown in following Table I:
| ? | MFD | Cutoff wavelength | Core concentricity | 1383 decay | Zero-dispersion wavelength |
| Plug A | 9.34 | 1195 | 0.24 | 0.282 | 1321 |
| Plug B | 9.47 | 1255 | 0.15 | 0.277 | 1312 |
Table I
Relatively the optical fiber main characteristic of plug A and plug B, can find out that two plug 1383nm are basic identical, and the core concentricity of plug B has obvious superior A rod.Prove at this point, adopt the sleeve pipe prefabricated rods of the fabrication and installation of this technique to reach the parameter of standard G652D optical fiber completely.
Claims (5)
1. a sleeve pipe prefabricated rods for structure-improved, is characterized in that: be made up of mandrel component, thimble assembly; When assembling, mandrel component is inserted in thimble assembly in vertical direction, form sleeve pipe prefabricated rods;
Mandrel component comprises plug, excessively caudal peduncle and dribbling caudal peduncle; Cone is drawn in plug bottom, and top is connected with excessive caudal peduncle; Excessively caudal peduncle top connects dribbling caudal peduncle; Dribbling caudal peduncle is provided with spheroid, and its bulb cuts out ventilating groove, and the circular diameter after cutting ventilating groove is consistent with dribbling caudal peduncle upper and lower part diameter;
Thimble assembly comprises sleeve pipe, transition conduit, location tail pipe and chuck tail pipe, and sleeve pipe bottom is drawn into taper, and excises tapered tip position, forms the ventilating pit of a 2 ~ 10mm, and sleeve pipe top is connected with transition conduit; Transition conduit top is connected with location tail pipe; Enlarging processing is carried out on tail pipe top, location, is set to hydraucone shape, and is connected with chuck tail pipe.
2. the sleeve pipe prefabricated rods of a kind of structure-improved according to claim 1, is characterized in that: the spheroid of described dribbling caudal peduncle contacts with the inwall of enlarging caudal peduncle.
3. the manufacture method of the sleeve pipe prefabricated rods of a kind of structure-improved claimed in claim 1, is characterized in that: take following steps to realize:
One, the making flow process of mandrel component:
(1) make plug: on core rod lathe, be made into plug through deposition after sintering, its underpart is pulled into taper, can use in testing tool precast rod refractivity detecting and analysing system test passes after cooling;
(2) select excessive caudal peduncle: select the glass stick of corresponding size according to the external diameter of plug and length, as excessive caudal peduncle;
(3) make dribbling caudal peduncle: according to the selected glass stick high temperature sintering on glass work lathe of the size of plug, slowly softening, to third side to mobile one end chuck, the glass at its high temperature place is extruded to formation spherical; After cooling in the enterprising step processing of mechanical lathe, to reach corresponding tolerance; After machining, re-use cutting machine and cut out four symmetrical ventilating grooves at spherical place, the circular diameter after cutting ventilating groove is consistent with top and the bottom diameter, width 1 ~ 4mm; Cutting needs to ensure the neat of otch, forbids to produce the phenomenon such as chipping, gap, carries out flame polish after cutting; The processing of dribbling caudal peduncle need to be controlled two form and position tolerances: the 1. right alignment of spheroid two ends glass stick, is controlled in Φ 0.2mm; 2. the circularity of spheroid, is controlled in Φ 0.1mm;
(4) mandrel component welding: dribbling target rod bottom and excessively pipe welding mutually, excessively manage bottom and be welded with plug, form mandrel component; After having welded, carry out alignment operation, require its overall bow degree must be less than 0.5mm/m;
Two, the making flow process of thimble assembly:
(1) make sleeve pipe: according to the sleeve pipe of the external diameter of plug and length selection corresponding size, sleeve pipe bottom is drawn into taper, and excises tapered tip position, form the ventilating pit of 2 ~ 10mm left and right;
(2) select excessively pipe: the excessive pipe of selecting corresponding size according to the requirement of design;
(3) make location tail pipe: enlarging processing is carried out in tail pipe top, location, be set to hydraucone shape, ensure that hydraucone external diameter and chuck tail pipe external diameter are consistent, the angle of enlarging approximately 45 degree; Bottom determines whether to carry out enlarging processing according to the external diameter of excessive pipe, needs to ensure that external diameter is between the two consistent;
(4) select chuck tail pipe: the chuck tail pipe of selecting corresponding size according to the requirement of design;
(5) thimble assembly welding: will locate tail pipe top and weld mutually with chuck tail pipe, bottom and excessively pipe welding mutually, excessively manage bottom and weld mutually with sleeve pipe, forms thimble assembly; Thimble assembly is carried out to alignment operation, require its bow degree must be less than 1mm/m;
Three, the assembling of mandrel component and thimble assembly:
Mandrel component and the timing of thimble assembly integral installation, should ensure in vertical direction plug to be inserted in sleeve pipe as far as possible, avoids causing because of the collision of plug and internal surface of sleeve pipe, friction the scuffing of glass surface;
Now the impetus of plug is the spheroid outside of dribbling caudal peduncle, and the spheroid of dribbling caudal peduncle contacts with the inwall of enlarging caudal peduncle, under the effect of gravity, just can realize the autocollimating effect of plug, makes a kind of sleeve pipe prefabricated rods of structure-improved.
4. the sleeve pipe prefabricated rods of a kind of structure-improved claimed in claim 1 is manufactured the method for optical fiber, it is characterized in that:
The sleeve pipe prefabricated rods of the structure-improved after assembling is completed is carried out clamping by the chuck of wire-drawer-tower and is fixed, to fiber drawing furnace heat temperature raising, in the time that temperature rises to 1850～1950 DEG C, by preform cone head slow decreasing to wire drawing fire door preheating 3 ~ 5 minutes; Determine lower excellent distance according to fiber drawing furnace hot-zone apart from fire door length, then preform cone subordinate is down to the hot-zone place of fiber drawing furnace; After prefabricated rods heating 3 ~ 5 minutes, start vacuum pump, to the sleeve pipe operation of bleeding, remove inside pipe casing because of the water vapour that welding produces, treat the aperture completely dissolve of prefabricated rods conehead, start wire-drawing operation, make optical fiber.
5. the sleeve pipe prefabricated rods of a kind of structure-improved according to claim 4 is manufactured the method for optical fiber, it is characterized in that:
In order to avoid to greatest extent drawing process to increase the water peak in optical fiber, in the drawing process after the ventilating pit on sleeve pipe lower taper top disappears, the absolute pressure of inside pipe casing need ensure lower than 50mbar.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512969A (en) * | 2001-05-30 | 2004-07-14 | Ƥ������C������˾ | Method of manufacturing optical fibre preforms and optical fibres |
| US20050064188A1 (en) * | 2003-09-19 | 2005-03-24 | Fletcher Joseph P. | Rod-In-Tube optical fiber preform assembly and method having reduced movement |
| CN1884165A (en) * | 2006-06-30 | 2006-12-27 | 浙江富通光纤技术有限公司 | Method for preparing optical fiber by large-sized low-water-peak optical fiber preform and dedicated device therefor |
| CN103030271A (en) * | 2012-12-19 | 2013-04-10 | 江苏亨通光电股份有限公司 | Method and device for producing low polarization mode dispersion optical fiber |
| CN203866199U (en) * | 2014-04-17 | 2014-10-08 | 中天科技精密材料有限公司 | Structure-modified sleeve prefabricated rod |
-
2014
- 2014-04-17 CN CN201410154728.XA patent/CN103951181B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1512969A (en) * | 2001-05-30 | 2004-07-14 | Ƥ������C������˾ | Method of manufacturing optical fibre preforms and optical fibres |
| US20050064188A1 (en) * | 2003-09-19 | 2005-03-24 | Fletcher Joseph P. | Rod-In-Tube optical fiber preform assembly and method having reduced movement |
| CN1884165A (en) * | 2006-06-30 | 2006-12-27 | 浙江富通光纤技术有限公司 | Method for preparing optical fiber by large-sized low-water-peak optical fiber preform and dedicated device therefor |
| CN103030271A (en) * | 2012-12-19 | 2013-04-10 | 江苏亨通光电股份有限公司 | Method and device for producing low polarization mode dispersion optical fiber |
| CN203866199U (en) * | 2014-04-17 | 2014-10-08 | 中天科技精密材料有限公司 | Structure-modified sleeve prefabricated rod |
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