CN220723974U - Fusion shrinking sintering device for core rod of optical fiber preform - Google Patents
Fusion shrinking sintering device for core rod of optical fiber preform Download PDFInfo
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- CN220723974U CN220723974U CN202322518549.7U CN202322518549U CN220723974U CN 220723974 U CN220723974 U CN 220723974U CN 202322518549 U CN202322518549 U CN 202322518549U CN 220723974 U CN220723974 U CN 220723974U
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- core rod
- optical fiber
- fiber preform
- sintering
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- 238000005245 sintering Methods 0.000 title claims abstract description 32
- 239000013307 optical fiber Substances 0.000 title claims abstract description 31
- 230000004927 fusion Effects 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- 230000007797 corrosion Effects 0.000 claims abstract description 19
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- 239000000428 dust Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims 1
- 229910001882 dioxygen Inorganic materials 0.000 claims 1
- 239000010453 quartz Substances 0.000 abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 16
- 238000004140 cleaning Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 16
- 238000002844 melting Methods 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 3
- 238000007740 vapor deposition Methods 0.000 description 3
- 238000005019 vapor deposition process Methods 0.000 description 3
- 238000000151 deposition Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000000253 optical time-domain reflectometry Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The utility model relates to a fusion shrinking and sintering device of a core rod of an optical fiber preform, which comprises a lathe bed, wherein a horizontal guide rail is arranged on the lathe bed, an air inlet rotary sealing chuck and an air outlet rotary sealing chuck are respectively arranged at two ends of the lathe bed, a sleeve-shaped heating furnace is arranged between the air inlet rotary sealing chuck and the air outlet rotary sealing chuck, and the sleeve-shaped heating furnace is connected with a reciprocating device. The utility model adopts a mode of combining high-pressure corrosion reaction cleaning treatment and low-pressure fusion shrinking sintering treatment to clean the joint surface of the quartz sleeve and the initial core rod, and fuses and sinters the joint surface into a whole to prepare the solid optical fiber preform, thereby reducing the joint interface defect in the core rod, effectively improving the fusion shrinking sintering quality of the core rod of the optical fiber preform and improving the processing efficiency of the core rod of the optical fiber preform.
Description
Technical Field
The utility model relates to a fusion shrinking and sintering device for a core rod of an optical fiber preform, and belongs to the technical field of manufacturing of optical fiber preforms.
Background
Currently, in the preparation process of the optical fiber preform core rod, a vapor reaction deposition process is commonly adopted, and typical processes include an in-tube vapor deposition process, such as PCVD (plasma chemical vapor deposition) plasma excitation chemical vapor deposition method and MCVD (modified chemical vapor deposition) modified chemical vapor deposition method, and an out-tube vapor deposition process, such as OVD (outside vapor deposition) external vapor deposition method and VAD (vapor axial deposition) vapor axial deposition method; for some optical fiber profiles, the prefabricated rod with high performance requirement often needs to combine two or more processes in actual production, and the preparation process of the core rod is carried out in multiple steps, wherein the key step is that after the vapor deposition of the initial core rod is finished, the initial core rod and the sleeve with specific refractive index are fused together to form the final core rod with large size.
In the existing fusion shrinkage sintering process, small bubbles often appear at the joint interface in the core rod after fusion shrinkage, and because the small bubbles are still positioned in the light guide part in the core rod, the final optical fiber performance is greatly adversely affected, and in order to reduce the bubbles, a higher fusion shrinkage sintering temperature is generally adopted, but the bending bow value of the core rod is increased, and the effective rod length is reduced, so that the manufacturing efficiency of the core rod is reduced. In addition, in the prior art, the sleeve and the initial core rod are in local contact friction in the fusion shrinkage sintering process, so that more small powder bright spots can appear, the powder cannot be discharged timely, and the bright spots have larger reflection peaks in the rear-end optical fiber OTDR test, so that the optical fiber is scrapped. In addition, the inner surface of the sleeve and the surface of the initial core rod are polluted under the influence of each front end process, so that the impurity content is high, the influence cannot be completely removed by the existing process, and the quality problem of local attenuation rise of the drawn optical fiber is easy to occur.
Disclosure of Invention
The utility model aims to solve the technical problems of the prior art and provides a shrinking and sintering device for an optical fiber preform core rod, which can reduce the defects of a bonding interface in the core rod, effectively improve the shrinking and sintering quality of the optical fiber preform core rod and improve the processing efficiency of the optical fiber preform core rod.
The technical scheme of the melt shrinkage sintering device adopted for solving the problems is as follows:
the device is characterized in that the air inlet rotary sealing chuck is communicated with a Freon air source and an oxygen air source through an air inlet connecting pipe, and the air outlet rotary sealing chuck is communicated with an air pressure control device through an air outlet connecting pipe.
According to the scheme, the air pressure control device comprises a low pressure control device and a high pressure control device, and the low pressure control device and the high pressure control device are connected with the air outlet connecting pipe through a switching valve or a control valve.
According to the scheme, the low-pressure device comprises a vacuum pump and a filter connected in series, one end of the low-pressure device is connected with the air outlet connecting pipe through a control valve, and the other end of the low-pressure device is communicated with the air outlet.
According to the scheme, the high-pressure device comprises a connected air supplementing pipeline, one end of the high-pressure device is connected with the air outlet connecting pipe through the control valve, and the other end of the high-pressure device is communicated with the air outlet.
According to the scheme, the air inlet rotary sealing chuck is fixed at one end of the lathe bed, and the air outlet rotary sealing chuck is arranged on the movable sliding seat to form the axial movable air outlet rotary sealing chuck.
According to the scheme, the air inlet rotary sealing chuck and the air outlet rotary sealing chuck are connected with the synchronous rotary driving device.
According to the scheme, the sleeve-shaped heating furnace is a graphite resistance heating furnace or an induction furnace, the axial heating area is 100-350 mm, and a protective gas source is arranged in the furnace chamber of the sleeve-shaped heating furnace for filling protective gas; the protective gas is inert gas such as Ar or N2.
According to the scheme, the Freon air source and the oxygen air source are respectively connected with the flow meters, wherein the oxygen is divided into a large flow meter and a small flow meter which are respectively controlled, the large flow meter is used for controlling the blowing of dust and impurities, and the small flow meter is used for controlling corrosion reaction.
According to the scheme, the relative pressure of the high-pressure control device is controlled within the range of 50-200 pa.
According to the scheme, the ratio of the Freon to the oxygen flow is 1:1-1:2.
The shrinking and sintering process of the shrinking and sintering device comprises the following steps:
the method comprises the steps of assembling a quartz sleeve with a specific refractive index and an initial core rod into a sleeve assembly, installing the sleeve assembly on a fusion sintering device, sleeving and maintaining a radial gap between the quartz sleeve and the initial core rod of the sleeve assembly, clamping one end of the quartz sleeve on an air inlet rotary sealing chuck, clamping the other end of the quartz sleeve on an air outlet rotary sealing chuck, driving the sleeve assembly to rotate at a constant speed through synchronous rotation of the air inlet rotary sealing chuck and the air outlet rotary sealing chuck after clamping, simultaneously starting heating by a sleeve-shaped heating furnace sleeved on the periphery of the sleeve assembly, heating at 1800-2250 ℃, enabling the heating furnace to reciprocate from one end to the other end along the axial direction of the sleeve assembly, introducing freon and oxygen into the radial gap between the quartz sleeve and the initial core rod through the air inlet rotary sealing chuck, simultaneously enabling the air outlet rotary sealing chuck to be communicated with a high-pressure control device, closing a freon air source and an oxygen source at the air inlet rotary sealing chuck end after the high-pressure corrosion reaction cleaning treatment, and switching the air outlet rotary sealing chuck end to a low-pressure control device through the air outlet rotary sealing chuck end until the sleeve assembly and the initial core rod are sintered into a whole, and a prefabricated optical fiber rod is manufactured.
According to the scheme, after the high-pressure corrosion reaction cleaning treatment, the inner wall of the quartz sleeve and the periphery of the initial core rod are purged by adopting high-flow oxygen before fusion shrinkage sintering.
According to the scheme, the relative pressure of the high-pressure corrosion reaction cleaning treatment is controlled within the range of 50-200 pa.
According to the scheme, the ratio of the Freon to the oxygen flow in the high-pressure corrosion reaction cleaning treatment is 1:1-1:2.
According to the scheme, the absolute pressure of the low-pressure melt-compression sintering treatment is controlled within the range of 10-100 mbar.
According to the scheme, the rotating speed of the sleeve assembly is 10-30 rad/min (revolutions per minute).
According to the scheme, the axial moving speed of the sleeve-shaped heating furnace is 10-30 mm/min, the heating axial area of the sleeve-shaped heating furnace is 100-350 mm, and the radial gap between the furnace chamber of the sleeve-shaped heating furnace and the sleeve component is filled with protective gas during heating.
According to the scheme, the clearance (the difference between the inner diameter of the sleeve and the outer diameter of the core rod) between the quartz sleeve and the initial core rod is 3-15 mm.
According to the scheme, the quartz sleeve is in the following specification before fusion shrinkage sintering: the external diameter is 30-60 mm, and the length is 1.0-2.5 m.
The utility model has the beneficial effects that: 1. and (3) introducing corrosive gas under high pressure to perform corrosion treatment on the inner surface of the sleeve and the outer surface of the core rod, so that the interface part with high impurity content is removed, the shrinkage quality of the core rod is improved, and the attenuation of the optical fiber is reduced. 2. By adopting higher in-pipe pressure during the corrosion reaction, the corrosion amount is improved, the time of corrosion is reduced, and the production efficiency of the equipment is improved. 3. The method has the advantages that extremely low in-tube pressure is adopted during shrinkage, the defects of bubbles, bright spots and the like are basically avoided at the joint interface in the core rod after shrinkage and sintering, the quality of the core rod is greatly improved, and meanwhile, the performance of the optical fiber is guaranteed. 4. Because lower tube internal pressure is adopted during the melting and shrinking, the pressure difference between the inside and the outside of the tube is larger, and the melting and shrinking can be realized only by lower heat, on one hand, the bow (bending) value of the core rod after the melting and shrinking is greatly improved, on the other hand, the temperature and the power of a heating furnace during the melting and shrinking can be greatly reduced, the service life of graphite parts such as a heating element is prolonged, and meanwhile, the consumption of protective gas is reduced. 5. The utility model adopts high-flow oxygen to purge before the melting and shrinking, and uses larger vacuum pumping force during the melting and shrinking, which is beneficial to pumping away powder particles generated by friction of the core rod and the sleeve and avoiding the powder particles from remaining at the interface. 6. The utility model provides good precondition for preparing the optical fiber preform with large-size and complex section, thereby being beneficial to improving the optical fiber performance and the manufacturing efficiency.
Drawings
FIG. 1 is a general structural view of one embodiment of the melt-down sintering apparatus of the present utility model.
Figure 2 is a cross-sectional assembly view of a cannula assembly in one embodiment of the utility model.
FIG. 3 is a graph comparing the attenuation of an optical fiber after drawing a core rod prepared according to the present utility model and the prior art.
FIG. 4 is a statistical distribution of values for core rod bow made in accordance with the present utility model and in accordance with the prior art.
Detailed Description
The utility model is further described below with reference to the drawings and examples.
The embodiment of the device disclosed by the utility model is shown in fig. 1, and comprises a lathe bed 1, wherein a horizontal guide rail 2 is arranged on the lathe bed, an air inlet rotary sealing chuck 4 and an air outlet rotary sealing chuck 5 are respectively arranged at two ends of the lathe bed, the air inlet rotary sealing chucks are fixed at one end of the lathe bed, and the air outlet rotary sealing chucks are arranged on a movable sliding seat to form an axial movable air outlet rotary sealing chuck. The air inlet rotary sealing chuck is communicated with a Freon air source and an oxygen air source through an air inlet connecting pipe, the Freon air source and the oxygen air source are respectively connected with flow meters, wherein oxygen is respectively controlled by a large flow meter and a small flow meter, the large flow meter is used for controlling dust and impurity sweeping, and the small flow meter is used for controlling corrosion reaction. The air outlet rotary sealing chuck is communicated with an air pressure control device through an air outlet connecting pipe, the air pressure control device comprises a low pressure control device and a high pressure control device, the low pressure control device and the high pressure control device are connected with the air outlet connecting pipe through control valves, the low pressure device comprises a vacuum pump 10 and a filter 12 connected in series, one end of the low pressure device is connected with the air outlet connecting pipe through a control valve 7, and the other end of the low pressure device is communicated with an air outlet; the high-pressure device comprises a connected air supplementing pipeline 9 and a filter 11 connected in series, one end of the high-pressure device is connected with an air outlet connecting pipe through a control valve 8, the other end of the high-pressure device is communicated with an air outlet, and the air outlet connecting pipe is connected with a pressure gauge 6. A sleeve-shaped heating furnace 3 is arranged between the air inlet rotary sealing chuck and the air outlet rotary sealing chuck, the sleeve-shaped heating furnace is a graphite resistance heating furnace or an induction furnace, the heating axial area is 100-350 mm, a protective air source is arranged in the furnace chamber of the sleeve-shaped heating furnace and used for filling protective air, the protective air is inert gas such as Ar or N2, a water cooling structure is also arranged on the furnace body shell, the sleeve-shaped heating furnace is connected with a reciprocating device, and during heating, the sleeve-shaped heating furnace slowly moves along the axial direction of the sleeve assembly and repeatedly reciprocates from one end to the other end, so that the corrosion and fusion shrinkage process of the sleeve assembly is completed.
The corrosion and fusion shrinkage process of the utility model is as follows: the quartz sleeve 14 with specific refractive index and the initial core rod 13 are assembled into a sleeve assembly in a clean workshop, the concrete assembly mode is shown in fig. 2, wherein the initial core rod and the quartz sleeve are fixed through fixing devices at two ends, each fixing device comprises a hollow tightening taper sleeve 15, threads are arranged at the front end of the tightening taper sleeve and are configured with tightening nuts, the periphery of the tightening taper sleeve is configured with a flange 16 fixed in inner holes at two ends of the quartz sleeve, and uniformly distributed vent holes are formed in the flange. The initial core rod is prepared through PCVD, MCVD, VAD and other vapor deposition processes. The assembled sleeve assembly is installed on a shrinking sintering device, a radial gap is reserved between a quartz sleeve and an initial core rod of the sleeve assembly in a sleeved mode, one end of the quartz sleeve is clamped on an air inlet rotary sealing chuck, the other end of the quartz sleeve is clamped on an air outlet rotary sealing chuck, after the clamping is finished, the air inlet rotary sealing chuck 4 and the air outlet rotary sealing chuck 5 are started to synchronously rotate to drive the sleeve assembly to rotate at a uniform speed, meanwhile, a sleeve-shaped heating furnace 3 sleeved on the periphery of the sleeve assembly starts to heat, when the temperature of a heating body rises to 1900 ℃, the first time of high-pressure corrosion reaction cleaning treatment is started, the relative pressure in the sleeve is controlled to be 100pa (higher than atmospheric pressure), the heating furnace moves back and forth from one end to the other end along the axial direction of the sleeve assembly, the axial moving speed is 18mm/min, the reaction gas freon and oxygen enter the gap between the sleeve and the core rod through the rotary sealing chuck 4 from the air inlet end according to the flow ratio of 1:1.5, the tail gas after the reaction passes through the air outlet rotary sealing chuck 5 to be communicated with a high-pressure control device, the high-pressure control valve 8, the filter 11 and the air supplementing pipeline 9 are communicated, the high-pressure corrosion control device is controlled, and the high-pressure corrosion control gas can be provided for one time (the reciprocating pressure can be 3) and can be one time needed). After the multi-pass corrosion is finished, the temperature of the furnace is set to be further increased to about 2000 ℃, sintering, compaction and sintering treatment are started, at this time, the reaction gas at the air inlet end is turned off, the program setting pressure control device is switched from a high-pressure control device to a low-pressure control device, the control valve 8 is closed, the control valve 7 is opened, the absolute pressure is controlled to be 60mbar, the pressure in the whole process is monitored by the pressure gauge 6, and the gas and impurities between the residual sleeve and the core rod are pumped out by the air pump through the control valve 7 and the filter 12 and enter the waste gas treatment system. Until the quartz sleeve and the initial core rod are fused, contracted and sintered into a whole, after the sintering process is finished, the furnace starts to cool down and continues to walk in a reciprocating manner, and the temperature of the rod is controlled to gradually and slowly decrease until the temperature reaches the room temperature.
In this embodiment, the interface with higher impurity content is removed by performing corrosion reaction on the inner surface of the sleeve with a specific refractive index and the outer surface of the small core rod, as shown in experimental data of fig. 3, the phenomenon of unstable sudden rise of the existing core rod with about 10% proportion in the middle attenuation is basically eliminated, and the whole attenuation is stable.
In this embodiment, because the low-pressure system is introduced by the shrinkage-melting compaction, a lower tube internal pressure is adopted during the shrinkage, the pressure difference between the inside and the outside of the tube is larger, the shrinkage-melting compaction can be realized only by a lower furnace heat, the bow value of the core rod after the shrinkage is greatly improved, as shown in fig. 4, the bending performance is obviously improved by the bow value statistics before and after the implementation of the utility model, and the effective rod length and the manufacturing efficiency of the core rod are greatly improved.
Claims (10)
1. The utility model provides a melt shrink sintering device of optical fiber perform plug, includes the lathe bed, is provided with the horizontal guide rail on the lathe bed, installs respectively at the both ends of lathe bed and admits air rotary seal chuck and give vent to anger rotary seal chuck, installs the cover form heating furnace between admitting air rotary seal chuck and giving vent to anger rotary seal chuck, and cover form heating furnace links to each other with reciprocating device, its characterized in that admitting air rotary seal chuck be linked together with freon air supply and oxygen air supply through admitting air take-over, give vent to anger rotary seal chuck be linked together with air pressure controlling means through giving vent to anger take-over.
2. The device for shrinking and sintering the core rod of the optical fiber preform according to claim 1, wherein the air pressure control device comprises a low pressure control device and a high pressure control device, and the low pressure control device and the high pressure control device are connected with the air outlet connecting pipe through a switching valve or a control valve.
3. The device for shrinking and sintering the core rod of the optical fiber preform according to claim 2, wherein the low-pressure control device comprises a vacuum pump and a filter connected in series, one end of the low-pressure device is connected with the air outlet connecting pipe through a control valve, and the other end of the low-pressure device is communicated with the air outlet.
4. The device for shrinking and sintering the core rod of the optical fiber preform according to claim 2 or 3, wherein the high-pressure control device comprises a connected air supplementing pipeline, one end of the high-pressure device is connected with the air outlet connecting pipe through a control valve, and the other end of the high-pressure device is communicated with the air outlet.
5. The apparatus according to claim 1 or 2, wherein the gas inlet rotary sealing chuck is fixed at one end of the lathe bed, and the gas outlet rotary sealing chuck is mounted on the moving slide base to form an axially moving gas outlet rotary sealing chuck.
6. The apparatus for fusion sintering of optical fiber preform core rod according to claim 1 or 2, wherein the inlet rotary sealing chuck and the outlet rotary sealing chuck are connected with a synchronous rotary driving device.
7. The apparatus for fusion sintering of optical fiber preform core rod according to claim 1 or 2, wherein the sleeve-shaped heating furnace is a graphite resistance heating furnace or an induction furnace, the axial heating area is 100-350 mm, and the furnace chamber of the sleeve-shaped heating furnace is provided with a protection gas source for filling protection gas.
8. The apparatus for shrinking and sintering the core rod of the optical fiber preform according to claim 1 or 2, wherein the freon gas source and the oxygen gas source are respectively connected with flow meters, wherein the oxygen is respectively controlled by a large flow meter and a small flow meter, the large flow meter is used for controlling the blowing of dust and impurities, and the small flow meter is used for controlling the corrosion reaction.
9. The apparatus of claim 4, wherein the relative pressure of the high-pressure control means is controlled within a range of 50 to 200 pa.
10. The apparatus for fusion sintering of optical fiber preform core rod according to claim 9, wherein the ratio of freon to oxygen flow is 1:1-1:2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322518549.7U CN220723974U (en) | 2023-09-15 | 2023-09-15 | Fusion shrinking sintering device for core rod of optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322518549.7U CN220723974U (en) | 2023-09-15 | 2023-09-15 | Fusion shrinking sintering device for core rod of optical fiber preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220723974U true CN220723974U (en) | 2024-04-05 |
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ID=90494506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322518549.7U Active CN220723974U (en) | 2023-09-15 | 2023-09-15 | Fusion shrinking sintering device for core rod of optical fiber preform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220723974U (en) |
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2023
- 2023-09-15 CN CN202322518549.7U patent/CN220723974U/en active Active
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