LU504148B1 - Device for manufacturing cladding sleeve - Google Patents
Device for manufacturing cladding sleeve Download PDFInfo
- Publication number
- LU504148B1 LU504148B1 LU504148A LU504148A LU504148B1 LU 504148 B1 LU504148 B1 LU 504148B1 LU 504148 A LU504148 A LU 504148A LU 504148 A LU504148 A LU 504148A LU 504148 B1 LU504148 B1 LU 504148B1
- Authority
- LU
- Luxembourg
- Prior art keywords
- cylindrical mold
- cladding sleeve
- driven shaft
- glass
- time pouring
- Prior art date
Links
- 238000005253 cladding Methods 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000011148 porous material Substances 0.000 claims abstract description 13
- 239000000156 glass melt Substances 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 abstract description 35
- 239000000835 fiber Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 description 17
- 238000010438 heat treatment Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000004031 devitrification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000013532 laser treatment Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- SITVSCPRJNYAGV-UHFFFAOYSA-L tellurite Chemical compound [O-][Te]([O-])=O SITVSCPRJNYAGV-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01265—Manufacture of preforms for drawing fibres or filaments starting entirely or partially from molten glass, e.g. by dipping a preform in a melt
- C03B37/01271—Manufacture of preforms for drawing fibres or filaments starting entirely or partially from molten glass, e.g. by dipping a preform in a melt by centrifuging
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/04—Other methods of shaping glass by centrifuging
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
Disclosed is a device for manufacturing a cladding sleeve. A cavity gap and a residual shrunken volume after two-time glass pouring are converted into a uniform pore channel together, so as to obtain the cladding sleeve that can be used for a single-mode fiber preform and has a ratio of an inner diameter to an outer diameter being 1/15.
Description
BL-5678
DEVICE FOR MANUFACTURING CLADDING SLEEVE LUS04148
[01] The present invention relates to the technical field of fiber preform manufacture, and particularly to a device for manufacturing a cladding sleeve.
[02] With superior beam quality and low intermodal dispersion, single-mode fibers are extensively used in the filed of long-distance signal transmission. In recent years, on account of significant scientific values and application requirements in the fields of laser radar, laser treatment, food quality control, air pollution monitoring, and the like, multicomponent glass based mid-infrared fibers have attracted much attention, which mainly include fluoride fibers, tellurite fibers and chalcogenide fibers, etc.
[03] In general, a rotation method is the best method to obtain a cladding sleeve having an ideal inner surface and a uniform inner diameter. However, due to cooling shrinkage of glass, a cladding sleeve that is used for a single-mode fiber preform and has a ratio of an inner diameter to an outer diameter being 1/15 cannot be obtained directly through the traditional rotation method. For example, assuming that a volume shrinkage rate of glass from a high temperature to a room temperature is 2% (the actual value is generally greater than 2%), even if a mold is filled with a glass melt and a shrunken volume is completely converted into a pore channel of a cladding sleeve, only a cladding sleeve having a ratio of an inner diameter to an outer diameter being about 1:7 can be obtained, but a cladding sleeve having a thinner pore channel cannot be obtained.
[04] In order to solve the above problem, the present invention provides a device for manufacturing a cladding sleeve. The device includes a cylindrical mold of a cylindrical structure and a rotary mechanism for driving the cylindrical mold to rotate around an axis of the cylindrical mold, openings that are coaxial with the cylindrical mold and are used for one-time pouring are provided at two ends of the cylindrical mold, the rotary mechanism includes a driven shaft and a driving shaft for driving the driven shaft and the cylindrical mold to coaxially rotate, the driving shaft and the driven shaft detachably block the two openings respectively, a feeding channel for two-time pouring is arranged at an axis of the driven shaft, one end of the feeding channel is in communication with the cylindrical mold, the other end thereof is detachably blocked by a top cover, and a gap that may be converted into a pore channel of the cladding sleeve is reserved between the top cover and a glass melt after two-time pouring.
[05] Compared with the prior art, the present invention achieves technical effects as follows:
[06] 1. According to the present invention, a cladding sleeve having an ideal inner surface and a uniform aperture may be obtained. Moreover, volume shrinkage of glass in a closed cavity of the cylindrical mold and the driven shaft is controlled through a two-time pouring method and a delayed rotation method, that is, placing and cooling are 1
BL-5678 carried out after one-time pouring, so as to solidify the glass in the cylindrical mold LU504148 from a periphery gradually towards an axis. After the recess formed at a top of the glass in the cylindrical mold due to cooling shrinkage reaches a certain degree, a shrunken portion is filled up through two-time pouring, so as to reduce a total shrinkage rate of the glass in the closed cavity of the cylindrical mold and the driven shaft.
[07] 2. The feeding channel includes the tapered section in communication with the cylindrical mold, the radial section of the tapered section gradually decreases in the direction away from the cylindrical mold, the wide end of the tapered section is in butt-joint with the recess formed at the top of the glass melt in the cylindrical mold due to cooling shrinkage after one-time pouring, and the diameter of the wide end of the tapered section is the same as the diameter of the top end of the recess, such that when the driven shaft and the cylindrical mold are connected and fixed for two-time pouring, the recess and the tapered section formed at the top of the glass melt may be likely to be filled with the glass melt to avoid insufficient pouring.
[08] 3. The feeding channel further includes the straight cylinder section coaxially in communication with the narrow end of the tapered section, the inner diameter of the straight cylinder section is 1/4 to 1/2 of the inner diameter of the cylindrical mold, and according to the cladding sleeve manufactured through the two-time pouring method and the delayed rotation method, a narrow-diameter sleeve structure having an opening at one end is arranged at the straight cylinder section. Although an inner diameter of the opening structure is less than an inner diameter of a pore channel of a main body of the cladding sleeve, in the present invention, by cutting off the narrow-diameter sleeve structure, the opening structure having a small inner diameter may be removed, so as to ensure uniformity of an aperture of the cladding sleeve, and improve a matching degree of the cladding sleeve and a thin rod with a fiber core. In this process, destructiveness is small, the inner surface of the cladding sleeve may not be polluted, and the cladding sleeve may not be damaged due to brittleness of the glass material, such that integrity of a main body structure of the cladding sleeve is ensured.
[09] 4. The cylindrical mold is provided with a heating mechanism that is arranged close to the top end of the cylindrical mold after one-time pouring, and a cooling speed of the top of the glass is appropriately reduced in the process of waiting for cooling the glass melt in the cylindrical mold, that is, the top of the glass is kept in an unsolidified and deformable state on the premise of not causing devitrification of the glass, so as to promote cooling shrinkage of the glass in the cylindrical mold to be completely converted into the recess of the top of the glass. Moreover, it is ensured that an unsolidified region of the glass in the cylinder mold after two-time pouring and the glass melt in the feeding channel may be fused into a whole, such that a pore channel having a uniform inner diameter may be conveniently formed through rotation, and a yield and quality of the cladding sleeve are improved.
[10] FIG 1 is an overall schematic structural diagram of the present invention; and
[11] FIG 2 is a flow diagram of a manufacturing process according to the present invention. 2
BL-5678
LU504148
[12] As shown in FIGs. 1 and 2, the example provides a device for manufacturing a cladding sleeve. The device includes a cylindrical mold 12 of a cylindrical structure and a rotary mechanism for driving the cylindrical mold 12 to rotate around an axis of the cylindrical mold, openings that are coaxial with the cylindrical mold and used for one-time pouring are provided at two ends of the cylindrical mold 12, and an inner diameter of the cylindrical mold 12 determines an outer diameter of the cladding sleeve, which is generally set within 30 mm. The rotary mechanism includes a driven shaft 8 and a driving shaft 11 for driving the driven shaft 8 and the cylindrical mold 12 to coaxially rotate, the driving shaft 11 and the driven shaft 8 detachably block the two openings respectively, a feeding channel for two-time pouring is arranged at an axis of the driven shaft 8, one end of the feeding channel is in communication with the cylindrical mold 12, the other end thereof is detachably blocked by a top cover 9, and a gap that may be converted into a pore channel of the cladding sleeve is reserved between the top cover 9 and a glass melt 15 after two-time pouring. Placing and cooling are carried out after one-time pouring, so as to solidify the glass in the cylindrical mold 12 from a periphery gradually towards an axis, and when a recess formed at the top of the glass in the cylindrical mold 12 due to cooling shrinkage reaches a certain degree, a shrunken portion is filled up through two-time pouring, so as to reduce a total shrinkage rate of the glass in a closed cavity of the cylindrical mold 12 and the driven shaft 8.
Then, rotation is carried out to convert a gap between the top cover 9 and the glass melt and a residual shrunken volume after two-time glass pouring into a uniform pore channel of the glass, so as to obtain the cladding sleeve having a ratio of an inner diameter to an outer diameter being 1/15.
[13] According to the present invention, the glass melt 15 is naturally cooled after one-time pouring, so as to solidify the glass melt 15 in the cylindrical mold 12 from a periphery gradually towards an axis. After a diameter (that is, an inner diameter of the cylindrical mold 12) of an unsolidified region is gradually reduced from 30 mm to be within about 12 mm, the shrunken volume is filled up through two-time pouring, and then rotation is started. In this way, a solidified outer wall of the periphery of the glass melt 15 in the cylindrical mold 12 actually plays a role similar to that of the cylindrical mold 12, that is, a radial section of the glass melt 15 surrounded by the solidified outer wall is decreased, which is equivalent to reducing a rotation outer diameter of the glass melt 15 in the case of not changing a prefabricated inner diameter, thereby manufacturing the cladding sleeve having a ratio of an inner diameter to an outer diameter being 1/15.
[14] The feeding channel includes the tapered section in communication with the cylindrical mold 12, the radial section of the tapered section gradually decreases in the direction away from the cylindrical mold 12, the wide end of the tapered section is in butt-joint with the recess formed at the top of the glass melt 15 in the cylindrical mold 12 due to cooling shrinkage after one-time pouring, and the diameter of the wide end of the tapered section is the same as the diameter of the top end of the recess, such that when the driven shaft 8 and the cylindrical mold 12 are connected and fixed for 3
BL-5678 two-time pouring, the recess and the tapered section formed at the top of the glass melt LU504148 may be likely to be filled with the glass melt 15 to avoid insufficient pouring. If the diameter of the wide end of the tapered section does not match the diameter of the top end of the recess, a small-angle gap will appear at a junction of the tapered section and the recess. Then, during two-time pouring, the gap at the junction is difficult to fill up with the glass melt 15, operation errors will be likely to be introduced due to differences of pouring speeds and other factors, thereby reducing accuracy and repeatability of a cladding sleeve product.
[15] Moreover, the feeding channel further includes a straight cylinder section coaxially in communication with the narrow end of the tapered section, and an inner diameter of the straight cylinder section is 1/4 to 1/2 of the inner diameter of the cylindrical mold 1/2, because the cladding sleeve manufactured through the rotation method in the prior art has a structure with an opening at one end, and the inner diameter of the opening structure is generally slightly less than the inner diameter of the pore channel of the main body of the cladding sleeve. The reason 1s that when the glass melt 15 is poured and rotation is just started, the high-temperature glass melt 15 will be rapidly cooled and solidified when being in contact with the relatively low-temperature inner wall of the mold, that is, the inner diameter of the opening structure is determined at the beginning of rotation, while the pore channel of the main body of the cladding sleeve will gradually become larger with cooling shrinkage of the glass melt 15, and the inner diameter of the cladding sleeve becomes less, such that differences (referring to relative differences) between the inner diameter of the straight cylinder section and the inner diameter of the cylinder mold become more obvious. In the present invention, the feeding channel in communication with the cylindrical mold 12 is arranged at the axis of the driven shaft 8, the straight cylinder section having an inner diameter being 1/4 to 1/2 of an inner diameter of the cylindrical mold 12 is arranged on the feeding channel, and according to the manufactured cladding sleeve, a narrow-diameter sleeve structure having an opening at one end is arranged at the straight cylinder section. Although the inner diameter of the opening structure is less than the inner diameter of the pore channel of the main body of the cladding sleeve, a person skilled in the art would readily cut off the narrow-diameter sleeve structure to remove the opening structure having a small inner diameter, so as to ensure uniformity of an aperture of the cladding sleeve, and improve a matching degree of the cladding sleeve and a thin rod with a fiber core. In this process, destructiveness is small, the inner surface of the cladding sleeve may not be polluted, and the cladding sleeve may not be damaged due to brittleness of the glass material, such that integrity of a main body structure of the cladding sleeve is ensured.
[16] Further, the top cover 9 includes a protrusion having an outline structure matching that of the straight cylinder section, the protrusion is inserted into the straight cylinder section, a gap is reserved between the protrusion and the glass melt 15 in the straight cylinder section after two-time pouring, and the feeding channel may be effectively blocked by the protrusion, such that the glass melt 15 in the closed cavity of the cylindrical mold 12 and the driven shaft 8 does not overflow during rotation.
[17] As a preferred embodiment of the present invention, the cylindrical mold 12 is 4
BL-5678 provided with a heating mechanism that is arranged close to the top end of the LU504148 cylindrical mold 12 after one-time pouring, the heating mechanism is used for heating the top end of the glass melt 15 in the cylindrical mold 12 after one-time pouring, and the heating mechanism preferably is a heating rod 17, etc. The reason is that a heat conductivity coefficient of glass is extremely small, and the outer diameter of the cladding sleeve is relatively large, such that in the process of placing and cooling after one-time pouring, a process of cooling and solidifying the glass melt 15 in the cylindrical mold 12 from the periphery to the axis is relatively slow, and when the shrunken volume of the glass does not reach a preset value, the top of the glass in the cylindrical mold 12 generally is solidified first. Therefore, cooling shrinkage of the glass may not be converted into the recess of the top of the glass, but may only be converted into a series of vacuum bubbles near the axis, and in this case, the cladding sleeve having a preset inner diameter may not be obtained. According to the present invention, by arranging a heating rod 17 above the top end of the cylindrical mold 12, and a cooling speed of the top of the glass is appropriately reduced in the process of waiting for cooling the glass melt 15 in the cylindrical mold 12, that is, the top of the glass is kept in an unsolidified and deformable state on the premise of not causing devitrification of the glass, so as to promote cooling shrinkage of the glass in the cylindrical mold 12 to be completely converted into the recess of the top of the glass.
Moreover, it is ensured that an unsolidified region of the glass in the cylinder mold 12 after two-time pouring and the glass melt 15 in the feeding channel may be fused into a whole, such that a pore channel having a uniform inner diameter may be conveniently formed through rotation, and a yield and quality of the cladding sleeve are improved.
[18] One end of the driven shaft 8 corresponding to the tapered section is inserted into the cavity of the cylindrical mold 12, so as to fully ensure that the driven shaft 8 blocks the opening of the cylindrical mold 12. Moreover, the cylindrical mold 12 and the driven shaft 8 may be conveniently connected to each other, and material is prevented from overflowing between the driven shaft 8 and the cylindrical mold 12 during rotation.
[19] Further, first annular flanges are arranged on peripheral sides of the two openings, second annular flanges are arranged at ends of the driven shaft 8 and the driving shaft 11 that are in butt-joint with the openings respectively, each first annular flange and the corresponding second annular flanges are in butt-joint with each other and connected to each other by means of a detachable annular buckle, and the two annular buckles are divided into a first annular buckle 5 matching the driving shaft 11 and a second annular buckle 7 matching the driven shaft 8.
[20] The peripheral side of the cylindrical mold 12 is provided with a heating jacket 6. On the one hand, the cylindrical mold 12 is preheated by starting the heating jacket 6, and a proper temperature field is provided in a subsequent rotation process, so as to avoid adverse situations such as glass cracking. On the other hand, a temperature of the heating jacket 6 is set to be an annealing temperature of the glass to anneal the glass for 3 h -6 h, and then the heating jacket 6 is stopped to naturally cool the cylindrical mold 12. Therefore, the cylindrical mold 12 and a belt assembly thereof are not required to be integrally moved into an electric furnace for annealing after being
BL-5678 disassembled, such that inconvenience caused by movement is avoided. LU504148
[21] Moreover, the driving shaft 11 is in transmission connection to a driving motor 2, preferably, the driving shaft 11 is connected to the driving motor 2 by means of a coupler 3, the driving motor 2 is provided with a right-angle base 1, and the right-angle base 1 includes two supporting plates connected to each other. One supporting plate is provided with a supporting seat for rotatably supporting the driving shaft 11 and the driven shaft 8 and is parallel to the axis of the cylindrical mold 12, and the other supporting plate is perpendicular to the axis of the cylindrical mold 12. By arranging the right-angle base 1, the driving motor 2 and each transmission assembly may be conveniently fixed, a direction of the cylindrical mold 12 may be more conveniently adjusted in case of need, and the cylindrical mold 12 in two states may be supported by means of the right-angle base 1. That is, the axis of the cylindrical mold 12 is horizontally arranged during rotation, the axis of the cylindrical mold 12 is vertically arranged during placing and cooling, specifically, after two-time pouring, the axis of the cylindrical mold 12 is kept to be vertically arranged and rotated and then horizontally arranged and rotated, and the axis may be kept to continuously rotate when the two states are switched until the cladding sleeve is manufactured, such that operation difficulty is reduced.
[22] Preferably, two supporting seats are arranged on the right-angle base 1 and are referred to as a first bearing seat 4 fixed on the right-angle base 1 and a second bearing seat 10 slidably arranged on the right-angle base 1 respectively, the driving shaft 11 penetrates a bearing on the first bearing seat 4 to rotary support the driving shaft 11, and the driven shaft 8 penetrates a bearing on the second bearing seat 10. During specific mounting work, in order to simplify the whole device, a slide rail 14 is relatively short.
In an actual mounting process, the driven shaft 8 is mounted first, and then is sleeved in a second bearing seat 10. On the contrary, in a disassembly process, the second bearing seat 10 is removed first, and then the driven shaft 8 is disassembled. Preferably, the slide rail 14 for the second bearing seat 10 to slide is arranged on the right-angle base 1.
[23] Moreover, the right-angle base 1 is further provided with a supporting frame 16 that may be detachably connected, and may be connected to the supporting frame 16 by means of an insertion hole 13 provided on the right-angle base 1, so as to adjust a state of the right-angle base 1. A pin structure for fixing the right-angle base 1 is arranged on the supporting frame 16, and a chamfer is arranged at a bottom of the right-angle base 1 arranged in an inclined manner, so as to play a supporting role in an inclined state. 6
Claims (4)
1. A device for manufacturing a cladding sleeve, comprising a cylindrical mold of a cylindrical structure and a rotary mechanism for driving the cylindrical mold to rotate around an axis of the cylindrical mold, wherein openings that are coaxial with the cylindrical mold and are used for one-time pouring are provided at two ends of the cylindrical mold, the rotary mechanism comprises a driven shaft and a driving shaft for driving the driven shaft and the cylindrical mold to coaxially rotate, the driving shaft and the driven shaft detachably block the two openings respectively, a feeding channel for two-time pouring is arranged at an axis of the driven shaft, one end of the feeding channel is in communication with the cylindrical mold, the other end thereof is detachably blocked by a top cover, and a gap that can be converted into a pore channel of the cladding sleeve 1s reserved between the top cover and a glass melt after two-time pouring.
2. The device for manufacturing a cladding sleeve according to claim 1, wherein the feeding channel comprises a tapered section in communication with the cylindrical mold, a radial section of the tapered section gradually decreases in a direction away from the cylindrical mold, a wide end of the tapered section is in butt-joint with a recess formed at a top of a glass melt in the cylindrical mold due to cooling shrinkage after one-time pouring, and a diameter of the wide end of the tapered section is the same as a diameter of a top end of the recess.
3. The device for manufacturing a cladding sleeve according to claim 2, wherein the feeding channel further comprises a straight cylinder section coaxially in communication with a narrow end of the tapered section, and an inner diameter of the straight cylinder section is 1/4 to 1/2 of an inner diameter of the cylindrical mold.
4. The device for manufacturing a cladding sleeve according to claim 3, wherein the top cover comprises a protrusion having an outline structure matching the straight cylinder section, the protrusion is inserted into the straight cylinder section, and a gap is reserved between the protrusion and a glass melt in the straight cylinder section after two-time pouring. 7
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504148A LU504148B1 (en) | 2023-05-08 | 2023-05-08 | Device for manufacturing cladding sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU504148A LU504148B1 (en) | 2023-05-08 | 2023-05-08 | Device for manufacturing cladding sleeve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU504148B1 true LU504148B1 (en) | 2023-11-10 |
Family
ID=88838626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU504148A LU504148B1 (en) | 2023-05-08 | 2023-05-08 | Device for manufacturing cladding sleeve |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU504148B1 (en) |
-
2023
- 2023-05-08 LU LU504148A patent/LU504148B1/en active IP Right Grant
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20231110 |