Optical fiber drawing device
Patent Information
- Application Number
- CN202421113510.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-21
AI Technical Summary
光纤预制棒的端头在拉丝炉内超过2000℃下熔化，其粘度减小，在表面张力作用下迅速收缩变细，并由牵引装置以合适的速度及张力向下拉成细丝，最后经过冷却、涂覆与紫外固化工艺生产处光纤成品，最后通过收卷装置将光纤收纳在光纤盘内；目前国内难以实现生产直径大于1.5mm的石英光纤，其原因是，1.5mm光纤太粗，机械强度难以保障，故难以做到稳定拉丝
[0014] 1. Through the above solution, an extruder is set up vertically. During the fiber drawing process, the extruder will first extrude the optical fiber and wrap it with a layer of ETFE or nylon material; at the same time, the detection mechanism above the traction unit The diameter and concentricity of the optical fiber will be detected first and the data will be fed back to the extruder in real time. The extruder will adjust based on the data to ensure the strength of the optical fiber, thereby making subsequent take-up stable.
Smart Images
Figure CN222313018U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical fiber preparation, in particular to an optical fiber drawing device. Background Art
[0002] Optical fiber is made by heating and softening the optical fiber preform rod in the optical fiber drawing furnace. The end of the optical fiber preform rod melts at more than 2000℃ in the drawing furnace, and its viscosity decreases. It shrinks and becomes thinner rapidly under the action of surface tension, and is pulled down into a filament by the traction device at a suitable speed and tension. Finally, it is cooled, coated and UV-cured to produce the finished optical fiber. Finally, the optical fiber is stored in the optical fiber tray through the winding device. At present, it is difficult to produce quartz optical fiber with a diameter greater than 1.5mm in China. The reason is that 1.5mm optical fiber is too thick and the mechanical strength is difficult to guarantee, so it is difficult to achieve stable drawing.
[0003] In the production process of the existing optical fiber drawing device, it is difficult to ensure the mechanical strength of the optical fiber, and the optical fiber is easy to break under the action of the traction wheel and the take-up unit. Utility Model Content
[0004] The utility model aims to solve the shortcomings in the prior art and proposes an optical fiber drawing device.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] An optical fiber drawing device comprises a drawing tower, a graphite furnace is installed on the drawing tower, a cooling mechanism is installed below the graphite furnace, a fiber diameter detector is installed below the cooling mechanism, a coating mechanism is installed below the fiber diameter detector, a cooling and curing mechanism 1 is installed below the coating mechanism, an extruder is installed below the cooling and curing mechanism 1, a cooling and curing mechanism 2 is installed below the extruder, a detection mechanism is installed below the cooling and curing mechanism 2, a traction unit is installed below the detection mechanism, a plurality of tensioning wheels and dancing wheels are installed on the right of the traction unit, and a take-up unit is arranged on the right of the drawing tower.
[0007] As a further solution of the utility model: the extruder includes a shell, a screw shell is installed inside the shell, a screw is rotatably installed in the screw shell, a core mold is rotatably installed in the screw, the head of the core mold is a conical structure, and a gap is left between the core mold and the shell for molten material to pass through, a through hole is opened in the middle of the core mold for optical fiber to pass through, the screw shell and the upper part of the shell are both provided with feed holes and are connected with a feed pipe, a cooling pipe and a plurality of heater brackets are arranged between the inner wall of the shell and the outer wall of the screw shell, heaters are respectively installed on the plurality of heater brackets, an end cover is installed on the top end of the shell, a bracket is fixed on the end cover, a screw motor is installed on the bracket, a motor gear is installed on the output shaft of the screw motor, a screw gear is installed on the top part of the screw protruding from the end cover, and the motor gear and the screw gear are meshed with each other.
[0008] As a further solution of the utility model: the core mold and the screw rod rotate relative to each other, and at the same time, the core mold is fixed on the bracket.
[0009] As a further solution of the utility model: a second sealing gasket is installed between the core mold and the screw, and a first sealing gasket is installed between the upper and lower bottom surfaces of the screw shell and the upper and lower bottom surfaces of the inner wall of the shell.
[0010] As a further solution of the utility model: a detachable protective cover is installed at the lower end of the shell, the bottom surface of the protective cover is conical and has a small hole for the optical fiber to pass through.
[0011] As a further solution of the utility model: the protective cover is made of transparent material.
[0012] As a further solution of the utility model: a filter screen is arranged at the inner bottom of the shell.
[0013] The beneficial effects of the utility model are:
[0014] 1. Through the scheme, an extruder is vertically arranged. During the optical fiber production and drawing process, the extruder will first extrude the optical fiber and wrap it with a layer of ETFE or nylon material; at the same time, the detection mechanism above the traction unit will first detect the diameter and concentricity of the optical fiber and feed back the data to the extruder in real time. The extruder is adjusted according to the data to ensure the strength of the optical fiber, thereby stabilizing the subsequent winding.
[0015] 2. Through the scheme, the extruder can extrude the optical fiber in the vertical direction to meet the layout of the optical fiber drawing device.
[0016] 3. Through the scheme, the through hole in the middle of the core mold guides the optical fiber. At the same time, the core mold remains stationary, and the outer wall of the core mold and the inner wall of the screw rotate relative to each other, which prevents the rotating screw from scratching the optical fiber to a limited extent.
[0017] 4. Through the above solution, the sealing gasket 1 effectively prevents the molten material from overflowing from the screw housing due to pressure; the sealing gasket 2 effectively prevents the molten material from overflowing into the gap at the contact between the screw and the core mold due to pressure.
[0018] 5. With the above solution, when the extruder is working, the molten material extruded by gravity may drip and damage the lower mechanism. At the same time, the discharge cone may be moved left and right due to the influence of wind, causing eccentricity. The protective cover can collect the dripping material while preventing the influence of wind.
[0019] 6. Through the above solution, the transparent protective cover allows the operator to observe the working status of the extruder head at all times, and at the same time observe the accumulation of materials in the protective cover and clean it in time to avoid affecting normal work.
[0020] 7. By setting up the filter, it is effectively avoided that the material is squeezed into the mold before it is fully melted. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a conceptual diagram of an optical fiber drawing device proposed by the utility model;
[0022] Figure 2 This is a conceptual diagram of a longitudinal extruder proposed in the utility model;
[0023] Figure 3 The utility model proposed Figure 2 Schematic diagram of the extruder structure;
[0024] Figure 4 The utility model proposed Figure 3 A cross-sectional view of the extruder;
[0025] Figure 5 This is a schematic structural diagram of point A of the extruder proposed by the utility model.
[0026] In the figure: 1-drawing tower, 2-graphite furnace, 3-cooling mechanism, 4-fiber diameter detector, 5-coating mechanism, 6-cooling and curing mechanism 1, 7-extruder, 8-cooling and curing mechanism 2, 9-detection mechanism, 10-traction unit, 11-winding unit, 12-dancing wheel, 13-tensioning wheel, 14-protective cover, 15-housing, 16-feeding pipe, 17-screw motor, 18-bracket, 19-screw gear, 20-end cover, 21-core mold, 22-screw, 23-heater, 24-heater bracket, 25-motor gear, 26-cooling pipe, 27-sealing gasket 1, 28-sealing gasket 2, 29-screw housing, 30-filter. DETAILED DESCRIPTION
[0027] The technical solution of the utility model is further described in detail below in conjunction with specific implementation methods.
[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0029] Example 1
[0030] An optical fiber drawing device, such as Figure 1 As shown, it includes a drawing tower 1. In order to solve the problem that it is difficult to ensure mechanical strength when drawing thicker diameter optical fibers, a graphite furnace 2 is installed on the drawing tower 1, a cooling mechanism 3 is installed below the graphite furnace 2, a fiber diameter detector 4 is installed below the cooling mechanism 3, a coating mechanism 5 is installed below the fiber diameter detector 4, a cooling and curing mechanism 1 6 is installed below the coating mechanism 5, an extruder 7 is installed below the cooling and curing mechanism 1 6, a cooling and curing mechanism 2 8 is installed below the extruder 7, a detection mechanism 9 is installed below the cooling and curing mechanism 2 8, a traction unit 10 is installed below the detection mechanism 9, a plurality of tensioning wheels 13 and a dancing wheel 12 are installed on the right side of the traction unit 10, and a take-up unit 11 is arranged on the right side of the drawing tower.
[0031] Through the scheme, the extruder head of the extruder 7 is arranged in the vertical direction. In the process of optical fiber production and drawing, the extruder first extrude the optical fiber and wrap it with a layer of ETFE or nylon material; at the same time, the detection mechanism above the traction unit will first detect the diameter and concentricity of the optical fiber and feedback the data to the extruder in real time. The extruder is adjusted according to the data to ensure the strength of the optical fiber, thereby making the subsequent winding stable.
[0032] The device is further configured as follows: Figure 2-4As shown, the extruder 7 is also improved. The extruder 7 includes a housing 15, a screw housing 29 is installed inside the housing 15, a screw 22 is rotatably installed inside the screw housing 29, the head of the core mold 21 is a conical structure, and a gap is left between the core mold 21 and the housing 15 for the molten material to pass through, a through hole is opened in the middle of the core mold 21 for the optical fiber to pass through, a through hole is opened in the middle of the core mold 21, a feed hole is opened on the upper part of the screw housing 29 and the housing 15 and is connected to a feed pipe 16, and the inner part of the housing 15 is provided with a feed hole. A cooling pipe 26 and a plurality of heater brackets 24 are arranged between the wall and the outer wall of the screw housing 29, and a heater 23 is respectively installed on the plurality of heater brackets 24. An end cover 20 is installed at the top end of the housing 15, and a bracket 18 is fixed on the end cover 20. A screw motor 17 is installed on the bracket 18, and a motor gear 25 is installed on the output shaft of the screw motor 17. A screw gear 19 is installed on the top of the screw 22 protruding from the end cover 20, and the motor gear 25 and the screw gear 19 are meshed with each other.
[0033] Through the scheme, the extruder can extrude the optical fiber in the vertical direction to meet the layout of the optical fiber drawing device.
[0034] The device is further configured such that the core mold 21 and the screw rod 22 rotate relative to each other, and the core mold 21 is fixed on the bracket 18 .
[0035] Through the scheme, the through hole in the middle of the core mold guides the optical fiber, and at the same time the core mold remains stationary, and the outer wall of the core mold and the inner wall of the screw rotate relative to each other, thereby preventing the rotating screw from scratching the optical fiber to a limited extent.
[0036] The device is further configured as follows: Figure 5 As shown, a sealing gasket 28 is installed between the core mold 21 and the screw 22, and a sealing gasket 27 is installed between the upper and lower bottom surfaces of the screw housing 29 and the upper and lower bottom surfaces of the inner wall of the housing 15 respectively.
[0037] Through the scheme, the sealing gasket 1 effectively prevents the molten material from overflowing from the screw housing due to pressure; the sealing gasket 2 effectively prevents the molten material from overflowing into the gap at the contact between the screw and the core mold due to pressure.
[0038] The device is further configured such that a detachable protective cover 14 is installed at the lower end of the housing 15 , and the bottom surface of the protective cover 14 is conical and has a small hole for the optical fiber to pass through.
[0039] With the scheme, when the extruder is working, the molten material extruded due to gravity may drip and damage the lower mechanism. At the same time, the discharge cone head may move left and right due to the influence of wind, causing eccentricity problems. The protective cover can collect the dripping material while preventing the influence of wind.
[0040] The device is further configured such that the protective cover 14 is made of a transparent material.
[0041] Through the scheme, the transparent protective cover allows the operator to observe the working status of the extruder head at all times, and at the same time observe the accumulation of materials in the protective cover and clean it in time to avoid affecting normal work.
[0042] The device is further configured as follows: Figure 5 As shown, a filter screen 30 is disposed at the inner bottom of the housing 15 .
[0043] By setting up the filter, it is effectively avoided that the material is squeezed into the mold before it is fully melted.
[0044] Working principle: The optical fiber mother material is melted at high temperature in the graphite furnace 2, and is drawn downward along a straight line under the action of the traction unit 10. The cooling mechanism 3 first cools it, and then the fiber diameter detector 4 measures the optical fiber diameter and feeds back the data to the traction unit in real time. The traction unit adjusts the traction force and traction speed according to the data to ensure that the optical fiber diameter is compliant, and then the coating mechanism 5 coats the optical fiber surface once; after coating, the optical fiber is cooled and solidified by the cooling and curing mechanism 6; then the optical fiber enters the extruder 7 for extrusion, and the operator puts the material into the screw housing 29 through the feed pipe 16, and the screw 2 2 is driven by the screw motor 17 to rotate and push the material downward. At the same time, with the cooperation of the heater 23 and the cooling tube 26, the material is melted and squeezed into the mold. Then, the molten material is extruded and coated on the surface of the optical fiber at the head of the extruder 7 to complete the extrusion of the optical fiber. The extruded optical fiber then enters the cooling and curing mechanism 2 8 to cool and solidify the surface material. Then, the detection mechanism 9 detects the diameter and concentricity of the optical fiber, and feeds back the data to the extruder 7 to adjust the extrusion parameters. After the detection is qualified, the tension of the optical fiber is screened by the tension wheel 13 and the dancing wheel 12, and then the optical fiber is taken up by the take-up unit 11.
[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. An optical fiber drawing device, characterized in that: It includes a drawing tower, a graphite furnace is installed on the drawing tower, a cooling mechanism is installed below the graphite furnace, a fiber diameter detector is installed below the cooling mechanism, a coating mechanism is installed below the fiber diameter detector, a cooling and curing mechanism 1 is installed below the coating mechanism, an extruder is installed below the cooling and curing mechanism 1, a cooling and curing mechanism 2 is installed below the extruder, a detection mechanism is installed below the cooling and curing mechanism 2, a traction unit is installed below the detection mechanism, a plurality of tensioning wheels and dancing wheels are installed on the right of the traction unit, and a wire taking-up unit is arranged on the right of the drawing tower.
2. The optical fiber drawing device according to claim 1, characterized in that: The extruder includes a shell, a screw shell is installed inside the shell, a screw is rotatably installed in the screw shell, a core mold is rotatably installed in the screw, the head of the core mold is a conical structure, and a gap is left between the core mold and the shell for molten material to pass through, a through hole is opened in the middle of the core mold for optical fiber to pass through, the screw shell and the upper part of the shell are both provided with feed holes and connected with a feed pipe, a cooling pipe and a plurality of heater brackets are arranged between the inner wall of the shell and the outer wall of the screw shell, and heaters are respectively installed on the plurality of heater brackets, an end cover is installed at the top end of the shell, a bracket is fixed on the end cover, a screw motor is installed on the bracket, a motor gear is installed on the output shaft of the screw motor, a screw gear is installed on the top part of the screw protruding from the end cover, and the motor gear and the screw gear are meshed with each other.
3. The optical fiber drawing device according to claim 2, characterized in that: The core mold and the screw rod rotate relative to each other, and the core mold is fixed on the bracket.
4. The optical fiber drawing device according to claim 3, characterized in that: A second sealing gasket is installed between the core mold and the screw, and a first sealing gasket is installed between the upper and lower bottom surfaces of the screw shell and the upper and lower bottom surfaces of the inner wall of the shell.
5. The optical fiber drawing device according to claim 4, characterized in that: A detachable protective cover is installed at the lower end of the shell. The bottom surface of the protective cover is conical and is provided with a small hole for the optical fiber to pass through.
6. The optical fiber drawing device according to claim 5, characterized in that: The protective cover is made of transparent material.
7. The optical fiber drawing device according to claim 6, characterized in that: A filter screen is arranged at the inner bottom of the shell.