Preparation device of small-diameter optical fiber product and small-diameter optical fiber product

Abstract

The invention provides a preparation device of a small-diameter optical fiber product and the small-diameter optical fiber product, the preparation device comprises an annealing pipe, one end of the annealing pipe is connected with a fiber drawing furnace, the other end of the annealing pipe is connected with a conical extension pipe through a sealing connecting piece, the conical extension pipe comprises a first conical extension pipe and a second conical extension pipe, and the first conical extension pipe is connected with the second conical extension pipe; the first conical extension pipe is connected with the second conical extension pipe through an adjustable connecting piece, and the diameter of a pipe opening of the second conical extension pipe is smaller than that of a pipe opening of the first conical extension pipe. Through the design of the annealing pipe and the extension pipe at the lower part of the annealing pipe, the design of the annealing pipe and the extension pipe has flexibility and adjustability, so that the fine control of the diameter of the optical fiber is realized, the requirement of a wire diameter fluctuation range of + / -0.2 mu m is met, the preparation requirements of optical fibers with different specifications are met, and high precision and high stability of small-diameter optical fiber products are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of thin-diameter optical fibers, and particularly to a preparation device for thin-diameter optical fiber products and thin-diameter optical fiber products. Background Art

[0002] In the field of optical fiber communication, the preparation of thin-diameter optical fiber products is undoubtedly a technology-intensive and crucial production process. The quality of optical fibers, especially the precise control of their diameters, is directly related to the transmission performance and stability of optical fibers, and is a core key technical indicator in the optical fiber preparation process. The coating diameter of optical fibers not only has a profound impact on key parameters such as attenuation and bandwidth, but also is directly related to the reliability and service life of optical fibers.

[0003] With the continuous development of optical fiber communication technology, the application scenarios of optical fiber products have become increasingly diverse. For example, G.657.A2 optical fibers are highly favored due to their low loss, low brittleness, and small bending radius. However, the transmission efficiency of optical fibers is closely related to the diameter of the fiber core. The more stable the core diameter, the higher the transmission efficiency. However, the control of the core diameter is an extremely difficult task.

[0004] In the process of optical fiber preparation, the design of the annealing tube and its lower extension tube plays a crucial role in the final control of the optical fiber diameter. The annealing process can not only effectively eliminate the internal stress of the optical fiber, thereby improving the mechanical properties of the optical fiber, but also further fine-tune the diameter of the optical fiber by adjusting the size and shape of the annealing tube and the extension tube. However, the traditional design of annealing tubes and extension tubes often lacks the necessary flexibility and adjustability, making it difficult for them to meet the preparation requirements of optical fibers of different sizes and specifications, thus limiting the flexibility and diversity of optical fiber preparation.

[0005] As the core equipment in the optical fiber preparation device, the drawing furnace is used to melt the optical fiber preform at high temperature and draw it into an optical fiber. However, there are also obvious deficiencies in the design of the lower extension tube of the traditional drawing furnace. These extension tubes are usually composed of graphite tubes and quartz tubes with fixed lengths. This design not only limits the adjustability of the total length of the extension tube, but also greatly restricts the diameter control of the optical fiber during the annealing process. Due to the inability to flexibly adjust the length and shape of the extension tube according to specific requirements, it has become extremely difficult to control the diameter of the optical fiber during the annealing process, thus affecting the overall quality and performance of the optical fiber.

[0006] The disclosure of the above background art content is only used to assist in understanding the inventive concept and technical solution of the present invention, and it does not necessarily belong to the prior art of this patent application, nor does it necessarily provide technical guidance; without clear evidence indicating that the above content was publicly available before the filing date of this patent application, the above background art should not be used to evaluate the novelty and inventiveness of this application. Summary of the Invention

[0007] In order to solve the technical problems existing in traditional devices, such as the difficulty in precisely controlling the diameter of optical fibers, the lack of flexibility and adjustability in the design of annealing tubes and extension tubes, and the deficiencies in the design of the lower extension tube of the drawing furnace, the present invention proposes a preparation device for fine-diameter optical fiber products and a fine-diameter optical fiber product. Through the design of the annealing tube and its lower extension tube, the design of the annealing tube and the extension tube has flexibility and adjustability, not only realizing the fine control of the optical fiber diameter to meet the wire diameter fluctuation range requirement of ±0.2 μm, but also adapting to the preparation requirements of optical fibers of different specifications, ensuring the high precision and high stability of the fine-diameter optical fiber products.

[0008]

[0008] In order to achieve the above object, the technical solution of the present invention is as follows:

[0009]

[0009] The present invention provides a preparation device for fine-diameter optical fiber products, including: an annealing tube, one end of the annealing tube is connected to a drawing furnace, and the other end of the annealing tube is connected to a tapered extension tube through a sealing connector. The tapered extension tube includes: a first tapered extension tube and a second tapered extension tube. The first tapered extension tube is connected to the second tapered extension tube through an adjustable connector, and the pipe orifice diameter of the second tapered extension tube is smaller than the pipe orifice diameter of the first tapered extension tube.

[0010]

[0010] The present invention proposes a preparation device for fine-diameter optical fiber products and a fine-diameter optical fiber product. Through the design of the annealing tube and its lower extension tube, the design of the annealing tube and the extension tube has flexibility and adjustability, not only realizing the fine control of the optical fiber diameter to meet the wire diameter fluctuation range requirement of ±0.2 μm, but also adapting to the preparation requirements of optical fibers of different specifications, ensuring the high precision and high stability of the fine-diameter optical fiber products.

[0011]

[0011] As a preferred technical solution, a sleeve is provided outside the annealing tube, and cooling water is provided inside the side wall of the sleeve.

[0012]

[0012] As a preferred technical solution, a connector for collecting volatiles is provided on the side wall of the annealing tube, and the connector for collecting volatiles passes through the sleeve and is connected to one end of an exhaust waste gas pipe.

[0013]

[0013] The other end of the exhaust waste gas pipe is connected to a volatile collection box, and the volatile collection box is connected to a stepless vacuum pump.

[0014]

[0014] As a preferred technical solution, the wire drawing furnace includes: a wire drawing furnace body and a bottom plate. The wire drawing furnace body is connected to one end of a sleeve and one end of an annealing tube through the bottom plate. An electronic differential pressure gauge is connected to the bottom plate. The electronic differential pressure gauge is used to monitor the pressure change during the wire drawing process in real time. The second conical extension tube is arranged corresponding to a cladding diameter measuring instrument. The cladding diameter measuring instrument is used to measure the diameter of the bare optical fiber. The cladding diameter measuring instrument and the electronic differential pressure gauge are electrically connected to a controller. The controller is electrically connected to a stepless vacuum pump to control the power of the stepless vacuum pump to regulate the suction force of the stepless vacuum pump.

[0015] As a preferred technical solution, precipitation water is provided in the volatile matter collection box, and a waste water discharge port is provided on the bottom wall of the volatile matter collection box.

[0016] As a preferred technical solution, the cladding diameter measuring instrument is arranged corresponding to a coating die. The coating die is arranged corresponding to an on-line coating diameter tester. The on-line coating diameter tester is used to monitor the coating diameter of the optical fiber in real time. The on-line coating diameter tester is electrically connected to a programmable logic controller. The programmable logic controller is electrically connected to an automatic adjuster. The automatic adjuster is electrically connected to the wire drawing furnace and the coating die to adjust the wire drawing speed of the wire drawing furnace and the coating pressure of the coating die to make the coating diameter of the optical fiber within the preset optical fiber coating diameter threshold range.

[0017] As a preferred technical solution, it includes: a display. The display is electrically connected to the programmable logic controller. The display is used to display the optical fiber coating diameter data received by the programmable logic controller in real time.

[0018] As a preferred technical solution, it includes: a wire take-up member. The wire take-up member is arranged corresponding to the on-line coating diameter tester to take up the coated optical fiber. The coating die includes: an outer coating sizing die and a coating die body. The outer coating sizing die is detachably connected to the coating die body.

[0019] The present invention also provides a thin-diameter optical fiber product, which is prepared by the preparation device of the thin-diameter optical fiber product according to any one of the above. The thin-diameter optical fiber product is a thin-diameter G.657.A2 type optical fiber product for ferrule.

[0020] The preparation device of a thin-diameter optical fiber product and the thin-diameter optical fiber product provided by the present invention have the following beneficial effects:

[0021] 1) Through the design of the annealing tube and the extension tube below it, the design of the annealing tube and the extension tube has flexibility and adjustability. It not only realizes the fine control of the optical fiber diameter, meets the requirement of the wire diameter fluctuation range of ±0.2μm, but also adapts to the preparation requirements of different specifications of optical fibers, ensuring the high precision and high stability of the thin-diameter optical fiber product;

[0022] 2) The optical fiber preform is heated to a molten state in a drawing furnace. Under the traction of the drawing furnace, the molten optical fiber material begins to be drawn into thin filaments. The drawn optical fiber filaments enter an annealing tube, and the temperature inside the annealing tube gradually decreases. The optical fiber material undergoes a process of slow cooling after heating, thereby eliminating internal stress, improving the stability and optical properties of the optical fiber. The annealed optical fiber filaments enter a first tapered extension tube, which plays a role in preliminary guiding and shaping, keeping the optical fiber filaments in a stable drawing state. The optical fiber filaments then enter a second tapered extension tube through an adjustable connector. The diameter of the nozzle of the second tapered extension tube is smaller than that of the nozzle of the first tapered extension tube. The optical fiber filaments are further compressed and shaped at this stage. By designing tapered extension tubes with different diameters, different degrees of compression and shaping of the optical fiber filaments can be achieved. In particular, the small-diameter design of the nozzle of the second tapered extension tube can further compress the optical fiber filaments, thereby precisely controlling the diameter of the optical fiber cladding to meet the requirement of a wire diameter fluctuation range of ±0.2 μm;

[0023] The cooperation between the sealing connector and the adjustable connector makes the design of the tapered extension tube highly flexible and adjustable. By the mutual cooperation of the sealing connector and the adjustable connector, it is convenient to disassemble and assemble tapered extension tubes with different nozzle diameter sizes, so as to adapt to the optical fiber preparation requirements of different specifications. The sealing connector is designed with a stepped circular card slot from top to bottom, which can be adapted to tapered extension tubes with different nozzle diameter sizes, meet the optical fiber preparation requirements of different specifications, ensure the sealing performance at the same time, and facilitate disassembly and assembly.

[0024] 3) During the annealing process of the optical fiber, it needs to experience certain temperature changes, which may cause fluctuations in the diameter of the optical fiber. By arranging cooling water in the side wall of the sleeve to cool the annealing tube, the temperature environment of the optical fiber during annealing can be stabilized, thereby reducing diameter fluctuations and improving the diameter accuracy of the optical fiber.

[0025] 4) The volatiles inside the annealing tube are discharged into a volatiles collection box by the suction and pressing method generated by the operation of a stepless vacuum pump. The volatiles are cooled and precipitated by the sedimentation water. After gradually cooling in the volatiles collection box, the volatiles sublimate into precipitates and are automatically discharged through the waste water outlet by a water circulation system, eliminating the need for manual cleaning. Thus, it can achieve repeated use without disassembly and cleaning for a long time. The presence of volatiles may affect the quality and performance of the optical fiber. Through this design, the volatiles are collected and processed in a timely manner, which not only reduces its interference with the optical fiber preparation process, thereby improving the quality and stability of the optical fiber product, but also reduces the cleaning frequency of the annealing tube, shortens the shutdown time, and improves production efficiency.

[0026] 5) When the drawing furnace is started, the drawing furnace body is connected to one end of the sleeve and one end of the annealing tube through a bottom plate to form a complete optical fiber preparation channel;

[0027] During the wire drawing process, the electronic differential pressure gauge is connected to the main body of the wire drawing furnace through the bottom plate to monitor the pressure change in the wire drawing furnace in real time. This is to ensure the stability and controllability of the wire drawing process because the pressure change may affect the diameter and quality of the optical fiber. After the optical fiber is drawn and passes through the annealing tube, it enters the second tapered extension tube. Here, the diameter of the optical fiber will be further controlled and adjusted. At the same time, the cladding diameter measuring instrument is arranged corresponding to the second tapered extension tube for measuring the diameter of the bare optical fiber in real time.

[0028] When the electronic differential pressure gauge detects that the pressure change during the wire drawing process exceeds the preset range, or when the diameter of the optical fiber measured by the cladding diameter measuring instrument deviates from the preset value, the controller will correspondingly control the stepless vacuum pump to adjust its power. By adjusting the power of the stepless vacuum pump, the magnitude of its suction can be controlled. This is to avoid excessive suction causing excessive tension on the optical fiber during the wire drawing process, thereby affecting the fluctuation of the wire diameter. By precisely controlling the suction of the stepless vacuum pump, the stability and quality of the optical fiber during the wire drawing process can be ensured without manual operation. This automated control system not only improves the precision and stability of optical fiber preparation but also reduces production costs and the scrap rate.

[0029] 6) The coating diameter on-line tester is arranged corresponding to the coating die and can monitor the diameter of the optical fiber after coating in real time. This is a key step to ensure that the thickness of the optical fiber coating is uniform and meets the requirements. The coating diameter on-line tester feeds back the data monitored in real time to the programmable logic controller (PLC). The PLC analyzes and processes the received data according to the preset algorithm and logic. According to the processing result of the PLC, the automatic adjuster receives the corresponding instruction. The automatic adjuster is electrically connected to the wire drawing furnace and the coating die and can adjust the wire drawing speed of the wire drawing furnace and the coating pressure of the coating die in real time. By adjusting the wire drawing speed of the wire drawing furnace and the coating pressure of the coating die, precise control of the coating diameter of the optical fiber can be achieved. If the coating diameter is too large, it may be necessary to reduce the wire drawing speed or increase the coating pressure. If the coating diameter is too small, it may be necessary to increase the wire drawing speed or reduce the coating pressure. This control system does not require manual operation, which not only improves the precision and stability of optical fiber preparation but also reduces production costs and the scrap rate.

[0030] 7) The fine diameter optical fiber product prepared by the preparation device for fine diameter optical fiber products provided by the present invention has a small diameter fluctuation range, which can reduce inter-mode coupling, improve transmission efficiency, enhance signal quality, support high-precision measurement and sensing, improve system reliability, and support broadband applications, etc. Description of the Drawings

[0031] Figure 1 It is a schematic structural diagram of the preparation device for fine diameter optical fiber products provided by the present invention.

[0032] Wherein: 1 - annealing tube; 2 - wire drawing furnace; 211 - wire drawing furnace body; 212 - bottom plate; 3 - sealing connection piece; 4 - first conical extension tube; 5 - second conical extension tube; 6 - adjustable connection piece; 7 - sleeve; 8 - cooling water; 9 - connection piece for collecting volatiles; 10 - waste gas extraction pipe; 11 - volatile collection box; 12 - precipitated water; 13 - waste water discharge port; 14 - water circulation system; 15 - electronic differential pressure gauge; 16 - cladding diameter measuring instrument; 17 - controller; 18 - stepless vacuum pump; 19 - coating die; 20 - on-line coating diameter tester; 21 - programmable logic controller; 22 - automatic adjuster; 23 - display; 24 - wire take-up piece. Detailed implementation manners

[0033] The preferred implementation manners of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] As Figure 1 shown, the present invention provides a preparation device for a thin-diameter optical fiber product, including: an annealing tube 1, one end of the annealing tube 1 is connected to a wire drawing furnace 2, and the other end of the annealing tube 1 is connected to a conical extension tube through a sealing connection piece 3. The conical extension tube includes: a first conical extension tube 4 and a second conical extension tube 5. The first conical extension tube 4 is connected to the second conical extension tube 5 through an adjustable connection piece 6. The pipe orifice diameter of the second conical extension tube 5 is smaller than that of the first conical extension tube 4.

[0035] The present invention provides a preparation device for a thin-diameter optical fiber product and a thin-diameter optical fiber product. Through the design of the annealing tube and the extension tube below it, the design of the annealing tube and the extension tube has flexibility and adjustability, which not only realizes the fine control of the optical fiber diameter, meets the requirement of the wire diameter fluctuation range of ±0.2 μm, but also adapts to the preparation requirements of optical fibers of different specifications, ensuring the high precision and high stability of the thin-diameter optical fiber product.

[0036] Preferably, the lower pipe orifice of the first conical extension tube 4 is smaller than the upper pipe orifice, and the length is 100 mm - 300 mm; the diameter of the upper pipe orifice of the first conical extension tube 4 is 30 mm - 50 mm; the diameter of the lower pipe orifice of the first conical extension tube 4 is 20 mm - 40 mm. The diameter of the upper pipe orifice of the first conical extension tube 4 gradually decreases to the lower pipe orifice, and the taper of the first conical extension tube 4 is 1:25. Further, the ratio between the bottom diameter and the cone height of the first conical extension tube 4 is 1:25. For optical fibers that require more fine diameter control, the second conical extension tube 5 can be added to achieve this. The second conical extension tube 5 has a smaller pipe orifice diameter, which helps to make the diameter of the produced optical fiber more stable and can meet the production requirements of different types and different diameters of optical fibers on the same production line.

[0037] The optical fiber preform is heated to a molten state in the drawing furnace 2. Under the traction of the drawing furnace 2, the molten optical fiber material begins to be drawn into fine filaments. The drawn optical fiber filaments enter the annealing tube 1. The temperature inside the annealing tube 1 gradually decreases, and the optical fiber material undergoes a process of slow cooling after heating, thereby eliminating internal stress, improving the stability and optical properties of the optical fiber. The annealed optical fiber filaments enter the first tapered extension tube 4. The first tapered extension tube 4 plays a role in preliminary guiding and shaping, keeping the optical fiber filaments in a stable drawing state. The optical fiber filaments then enter the second tapered extension tube 5 through the adjustable connector 6. The nozzle diameter of the second tapered extension tube 5 is smaller than that of the first tapered extension tube 4. The optical fiber filaments are further compressed and shaped at this stage. By designing tapered extension tubes with different diameters, different degrees of compression and shaping of the optical fiber filaments can be achieved. In particular, the small-diameter design of the nozzle of the second tapered extension tube 5 can further compress the optical fiber filaments, thereby precisely controlling the diameter of the optical fiber cladding to meet the requirement of a wire diameter fluctuation range of ±0.2 μm;

[0038] The cooperation between the sealing connector 3 and the adjustable connector 6 makes the design of the tapered extension tube highly flexible and adjustable. By the cooperation between the sealing connector 3 and the adjustable connector 6, tapered extension tubes with different nozzle diameter sizes can be conveniently disassembled and assembled, so as to adapt to the optical fiber preparation requirements of different specifications. The sealing connector 3 is designed with a stepped circular card slot from top to bottom, which can be adapted to tapered extension tubes with different nozzle diameter sizes, meet the optical fiber preparation requirements of different specifications, and ensure the sealing performance while being convenient for disassembly and assembly.

[0039] Preferably, a sleeve 7 is provided outside the annealing tube 1, and cooling water 8 is provided inside the side wall of the sleeve 7. The optical fiber needs to undergo a certain temperature change during the annealing process, which may cause fluctuations in the diameter of the optical fiber. By cooling the annealing tube 1 through the cooling water 8 provided inside the side wall of the sleeve 7, the temperature environment of the optical fiber during the annealing process can be stabilized, thereby reducing diameter fluctuations and improving the diameter accuracy of the optical fiber.

[0040] Preferably, a connector 9 for collecting volatiles is provided on the side wall of the annealing tube 1. The connector 9 for collecting volatiles passes through the sleeve 7 and is connected to one end of the exhaust waste gas pipe 10. Its structure is simple and the operation is convenient, facilitating the discharge of the volatiles inside the annealing tube 1 into the volatile collection box 11. The volatiles are, for example, ash and the like.

[0041] Preferably, the other end of the waste gas extraction pipe 10 is connected to the volatile collection box 11, and the volatile collection box 11 is connected to the stepless vacuum pump 18; there is precipitation water 12 in the volatile collection box 11, and a waste water discharge port 13 is provided on the bottom wall of the volatile collection box 11; the volatile substances inside the annealing pipe 1 are discharged into the volatile collection box 11 by the suction pressure generated by the operation of the stepless vacuum pump 18. The precipitation water 12 is used to cool and precipitate the volatile substances. After the volatile substances are gradually cooled in the volatile collection box 11, they sublimate into precipitates and are automatically discharged through the waste water discharge port 13 by the water circulation system 14, eliminating manual cleaning. Thus, it can be reused repeatedly without disassembly and cleaning for a long time. The existence of volatile substances may affect the quality and performance of the optical fiber. Through this design, the volatile substances are collected and processed in a timely manner, which not only reduces their interference in the optical fiber preparation process, thereby improving the quality and stability of the optical fiber product, but also reduces the cleaning frequency of the annealing pipe, shortens the downtime, and improves the production efficiency.

[0042] Preferably, the wire drawing furnace 2 includes: a wire drawing furnace body 211 and a bottom plate 212. The wire drawing furnace body 211 is connected to one end of the sleeve 7 and one end of the annealing pipe 1 through the bottom plate 212. An electronic differential pressure gauge 15 is connected to the bottom plate 212. The electronic differential pressure gauge 15 is used to monitor the pressure change during the wire drawing process in real time. The second conical extension pipe 5 is arranged corresponding to the cladding diameter measuring instrument 16. The cladding diameter measuring instrument 16 is used to measure the diameter of the bare optical fiber. The cladding diameter measuring instrument 16 and the electronic differential pressure gauge 15 are electrically connected to the controller 17, and the controller 17 is electrically connected to the stepless vacuum pump 18 to control the power of the stepless vacuum pump 18 to regulate the suction force of the stepless vacuum pump 18;

[0043] When the wire drawing furnace 2 is started, the wire drawing furnace body 211 is connected to one end of the sleeve 7 and one end of the annealing pipe 1 through the bottom plate 212 to form a complete optical fiber preparation channel;

[0044] During the wire drawing process, the electronic differential pressure gauge 15 is connected to the wire drawing furnace body 211 through the bottom plate 212 to monitor the pressure change in the wire drawing furnace 2 in real time. This is to ensure the stability and controllability of the wire drawing process because the pressure change may affect the diameter and quality of the optical fiber; after the optical fiber is drawn and passes through the annealing pipe 1, it enters the second conical extension pipe 5. Here, the diameter of the optical fiber will be further controlled and adjusted. At the same time, the cladding diameter measuring instrument 16 is arranged corresponding to the second conical extension pipe 5 to measure the diameter of the bare optical fiber in real time;

[0045] When the electronic differential pressure gauge 15 detects that the pressure change during the wire drawing process exceeds the preset range, or when the fiber diameter measured by the cladding diameter measuring instrument 16 deviates from the preset value, the controller 17 will correspondingly control the stepless vacuum pump 18 to adjust its power. By adjusting the power of the stepless vacuum pump 18, the magnitude of its suction can be controlled. This is to avoid excessive suction force causing excessive tension on the optical fiber during the wire drawing process, thereby affecting the fluctuation of the wire diameter. By precisely controlling the suction force of the stepless vacuum pump 18, the stability and quality of the optical fiber during the wire drawing process can be ensured without manual operation. This kind of automatic control system not only improves the precision and stability of optical fiber preparation, but also reduces the production cost and the rejection rate.

[0046] Preferably, the cladding diameter measuring instrument 16 is arranged corresponding to the coating die 19, the coating die 19 is arranged corresponding to the on-line coating diameter tester 20. The on-line coating diameter tester 20 is used to monitor the optical fiber coating diameter in real time. The on-line coating diameter tester 20 is electrically connected to the programmable logic controller 21, the programmable logic controller 21 is electrically connected to the automatic adjuster 22, and the automatic adjuster 22 is electrically connected to the wire drawing furnace 2 and the coating die 19 to adjust the wire drawing speed of the wire drawing furnace 2 and the coating pressure of the coating die to make the optical fiber coating diameter within the preset optical fiber coating diameter threshold range;

[0047] The drawing furnace 2 starts to work. Under the traction of the drawing furnace 2, the molten optical fiber material begins to be drawn into fine filaments. The drawn optical fiber filaments sequentially enter the annealing tube 1, the first tapered extension tube 4, and the second tapered extension tube 5 for annealing, compression, and shaping to obtain a bare optical fiber. The bare optical fiber enters the coating die 19. The coating die 19 is filled with a specific coating material for forming a coating layer on the surface of the bare optical fiber. The on-line coating diameter tester 20 is arranged corresponding to the coating die 19 and can real-time monitor the diameter of the optical fiber after coating, which is a key step to ensure that the thickness of the optical fiber coating layer is uniform and meets the requirements. The on-line coating diameter tester 20 feeds back the real-time monitored data to the programmable logic controller 21 (PLC). The programmable logic controller 21 analyzes and processes the received data according to the preset algorithm and logic. According to the processing result of the programmable logic controller 21, the automatic adjuster 22 receives the corresponding instruction. The automatic adjuster 22 is electrically connected to the drawing furnace 2 and the coating die 19 and can real-time adjust the drawing speed of the drawing furnace 2 and the coating pressure of the coating die 19. By adjusting the drawing speed of the drawing furnace 2 and the coating pressure of the coating die 19, precise control of the coating diameter of the optical fiber can be achieved. If the coating diameter is too large, it may be necessary to reduce the drawing speed or increase the coating pressure. If the coating diameter is too small, it may be necessary to increase the drawing speed or reduce the coating pressure. Manual operation by personnel is not required, and stable control of the coating fine diameter is achieved, and stable control of the coating diameter within the range of 170μm - 210μm is achieved. This control system not only improves the precision and stability of optical fiber preparation but also reduces production costs and the scrap rate.

[0048] Preferably, it includes: a display 23. The display 23 is electrically connected to the programmable logic controller 21. The display 23 is used to real-time display the optical fiber coating diameter data received by the programmable logic controller 21, facilitating the staff to consult the optical fiber coating diameter data.

[0049] Preferably, it includes: a take-up member 24. The take-up member 24 is arranged corresponding to the on-line coating diameter tester 20 to take up the coated optical fiber. The take-up member 24 not only functions as taking up the wire but also functions as pulling the optical fiber.

[0050] The coating die 19 includes: an outer sizing die and a coating die body. The outer sizing die is detachably connected to the coating die body. By installing outer sizing dies of different specifications according to different coating diameter specifications, production of multiple coating diameter specifications can be achieved. The coating diameter specifications are preferably 280μm - 350μm.

[0051] The present invention also provides a fine-diameter optical fiber product, which is prepared by the preparation device of the fine-diameter optical fiber product according to any one of the above. The fine-diameter optical fiber product is a fine-diameter G.657.A2 type optical fiber product for ferrule. The diameter fluctuation range of this fine-diameter optical fiber product is small, which can reduce inter-mode coupling, improve transmission efficiency, enhance signal quality, support high-precision measurement and sensing, improve system reliability, and support broadband applications, etc.

[0052] It can be understood that the present invention is described by some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present invention, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein. All changes or equivalent replacements that fall within the scope of the claims of this application. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein. All embodiments that fall within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A device for preparing a thin-diameter optical fiber product, characterized in that: include: An annealing tube, one end of which is connected to a wire drawing furnace, and the other end of which is connected to a tapered extension tube via a sealing connector, wherein the tapered extension tube comprises: a first tapered extension tube and a second tapered extension tube, wherein the first tapered extension tube is connected to the second tapered extension tube via an adjustable connector, and a tube orifice diameter of the second tapered extension tube is smaller than a tube orifice diameter of the first tapered extension tube.

2. The device for preparing a thin-diameter optical fiber product according to claim 1, characterized in that: A sleeve is arranged outside the annealing tube, and cooling water is arranged inside the side wall of the sleeve.

3. The device for preparing a thin-diameter optical fiber product according to claim 2, characterized in that: A connecting piece for collecting volatiles is provided on the side wall of the annealing tube. The connecting piece for collecting volatiles passes through the sleeve and is connected to one end of the exhaust gas extraction pipe.

4. The device for preparing a thin-diameter optical fiber product according to claim 3, characterized in that: The other end of the exhaust gas extraction pipe is connected to a volatile matter collection box, and the volatile matter collection box is connected to a stepless vacuum pump.

5. The device for preparing a thin-diameter optical fiber product according to claim 4, characterized in that: The wire drawing furnace includes: a wire drawing furnace body and a bottom plate, the wire drawing furnace body is connected to one end of the sleeve and one end of the annealing tube through the bottom plate, an electronic differential pressure gauge is connected to the bottom plate, the electronic differential pressure gauge is used to monitor the pressure changes in real time during the wire drawing process, the second conical extension tube is arranged corresponding to the cladding diameter measuring instrument, the cladding diameter measuring instrument is used to measure the diameter of the bare optical fiber, the cladding diameter measuring instrument and the electronic differential pressure gauge are electrically connected to the controller, the controller is electrically connected to the stepless vacuum pump, and the power of the stepless vacuum pump is controlled to adjust the suction force of the stepless vacuum pump.

6. The device for preparing a thin-diameter optical fiber product according to claim 4, characterized in that: Settled water is arranged in the volatile matter collecting box, and a waste water outlet is arranged on the bottom wall of the volatile matter collecting box.

7. The device for preparing a thin-diameter optical fiber product according to claim 5, characterized in that: The cladding diameter measuring instrument is arranged corresponding to the coating die, and the coating die is arranged corresponding to the coating diameter online tester, and the coating diameter online tester is used to monitor the optical fiber coating diameter in real time, and the coating diameter online tester is electrically connected to the programmable logic controller, and the programmable logic controller is electrically connected to the automatic adjuster, and the automatic adjuster is electrically connected to the drawing furnace and the coating die to adjust the drawing speed of the drawing furnace and the coating pressure of the coating die to achieve the optical fiber coating diameter within a preset optical fiber coating diameter threshold range.

8. The device for preparing a thin-diameter optical fiber product according to claim 7, characterized in that: include: A display is electrically connected to the programmable logic controller, and is used to display the optical fiber coating diameter data received by the programmable logic controller in real time.

9. The device for preparing a thin-diameter optical fiber product according to claim 7, characterized in that: include: A take-up piece is arranged corresponding to the coating diameter online tester to take up the coated optical fiber. The coating mold comprises: an outer coating sizing mold and a coating mold body. The outer coating sizing mold is detachably connected to the coating mold body.

10. A thin diameter optical fiber product, characterized in that: The thin-diameter optical fiber product is prepared by the preparation device of the thin-diameter optical fiber product according to any one of claims 1 to 9, wherein the thin-diameter optical fiber product is a thin-diameter G.657.A2 type optical fiber product for core insertion.

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