Optical fiber drawing tower and method
By using an optical fiber diameter measuring device and a controller to automatically adjust the spacing of the auxiliary drawing wheels, the problem of dimensional instability in the optical fiber drawing process is solved, achieving a highly efficient and stable optical fiber drawing process and reducing the wear and replacement frequency of the auxiliary drawing wheels.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUHAN BRIGHTCORE OPTICAL FIBER CO LTD
- Filing Date
- 2024-11-14
- Publication Date
- 2026-08-04
AI Technical Summary
In existing optical fiber drawing processes, the auxiliary drawing wheel cannot effectively control the dimensional stability of the drawn optical fiber, resulting in frequent position adjustments and severe wear, which increases economic and time costs.
The diameter of the bare fiber is measured by an optical fiber diameter measuring device. The controller controls the moving part to adjust the spacing of the auxiliary drawing wheel according to the measurement data, and drives the drawing wheel to rotate through the driving part, so as to realize the automatic adjustment and stable drawing of the optical fiber.
It improves the stability and efficiency of fiber drawing dimensions, reduces the wear of auxiliary drawing wheels, and decreases replacement frequency and cost.
Smart Images
Figure CN119461826B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical fiber processing equipment, and in particular to an optical fiber drawing tower drawing device and method. Background Technology
[0002] The manufacturing process of optical fiber typically includes steps such as preform preparation, preform processing, and fiber drawing. Among these, the fiber drawing process determines the mechanical strength, transmission characteristics, and lifespan of the optical fiber, and is crucial for ensuring its quality.
[0003] Fiber optic drawing is a process that uses high temperature and high pressure technology to draw optical fiber preforms into a specified thin diameter. The specific process includes feeding the optical fiber preform into a high-temperature furnace in a fiber drawing tower, heating it to its softening point, and then allowing it to fall naturally to form a thin filament with a small ball. After cutting off the thicker fiber ball at the initial end of the bare fiber, the fiber is drawn thinner using auxiliary and main drawing wheels. Finally, the drawn fiber is coated.
[0004] To draw the bare fiber to the target size, it is essential to ensure that the auxiliary drawing rollers can clamp and move the fiber. In current production processes, the position of the auxiliary drawing rollers is typically set manually based on experience. The distance between the two rollers is generally smaller than the fiber size, and this setting remains unchanged. If the distance is too large, the fiber will not be effectively drawn thinner. If the distance is too small, the initial thicker fiber will easily cause wear and grooves at the contact points between the rollers and the fiber. Consequently, as the fiber is gradually drawn thinner, the rollers cannot provide sufficient friction to move the fiber downwards, thus hindering effective control of the fiber drawing size. Manually adjusting the position of the auxiliary drawing rollers not only fails to effectively control the stability of the fiber drawing size but also requires frequent replacement of the rollers, wasting economic and time costs. Summary of the Invention
[0005] This invention provides a fiber drawing tower drawing device to solve the defect in the prior art where the auxiliary drawing wheel cannot effectively control the dimensional stability of the drawn fiber.
[0006] According to the present invention, a fiber drawing tower drawing device includes a controller, a drive component, a moving component, a fiber diameter measuring component, and an auxiliary drawing wheel group and a main drawing wheel arranged sequentially from top to bottom. The auxiliary drawing wheel group includes two auxiliary drawing wheels. The driving component is used to drive the main drawing wheel and the two auxiliary drawing wheels to rotate; The two auxiliary drawing wheels are connected to a movable component, which drives the two auxiliary drawing wheels to move closer to or further away from each other. The fiber optic diameter measuring device is used to measure the size data of the bare fiber that is inserted into and / or exits the auxiliary drawing wheel assembly; The controller is connected to the moving part and the fiber optic diameter measuring part respectively. The controller sends control commands to the moving part according to the size data measured by the fiber optic diameter measuring part. The moving part drives the two auxiliary wire drawing wheels to move closer or further away according to the control commands.
[0007] According to the present invention, a fiber drawing tower drawing device further includes a fiber coating device, which is disposed between the auxiliary drawing wheel group and the main drawing wheel for coating the drawn bare fiber.
[0008] According to the present invention, a fiber drawing tower drawing device includes a moving component comprising a first displacement driver and a second displacement driver. The first displacement driver drives an auxiliary drawing wheel to move, and the second displacement driver drives another auxiliary drawing wheel to move. A controller is connected to the first displacement driver and the second displacement driver respectively.
[0009] According to the present invention, a fiber drawing tower drawing device is provided, wherein the driving component includes a first motor, a second motor and a third motor, the first motor drives the main drawing wheel to rotate, the second motor drives one of the auxiliary drawing wheels to rotate, the third motor drives another of the auxiliary drawing wheels to rotate, and the controller is connected to the first motor, the second motor and the third motor respectively.
[0010] According to the present invention, an optical fiber drawing tower drawing device is provided, wherein a protective belt is sleeved on the outer wall of the auxiliary drawing wheel, and the auxiliary drawing wheel applies a traction force to the optical fiber through the protective belt.
[0011] The present invention also provides a fiber drawing method for a fiber drawing tower fiber drawing device, comprising the following steps: S1. Set the target size value on the controller, place the qualified preform on the fiber drawing tower, heat the fiber preform, the front end of the preform melts under heat, and under the action of gravity, form a relatively thick bare fiber with a small ball at the top. S2. After cutting off the initial fiber ball of the bare fiber, pull the remaining bare fiber through the fiber diameter measuring device and the two auxiliary drawing rollers, and then connect it to the main drawing roller. S3. The fiber optic diameter measuring device measures the diameter of the bare fiber passing through it to obtain the bare fiber diameter data D. The controller compares the diameter data D with the target size value. When D is greater than the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels to move closer according to the control command and adjusts the distance L between the two auxiliary drawing wheels to clamp the bare fiber, where L=DX. S4. The controller sends a drive signal to the drive unit. Upon receiving the drive signal, the drive unit drives the main drawing wheel and the auxiliary drawing wheel to rotate, applying a downward traction force to the optical fiber and thinning the bare fiber. The optical fiber diameter measuring device continuously measures the diameter D of the bare fiber passing through. When D equals the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels away from the bare fiber according to the control command, so that the two auxiliary drawing wheels disengage from the bare fiber.
[0012] According to the fiber drawing tower drawing device provided by the present invention, the fiber diameter measuring device includes a first fiber diameter measuring instrument and a second fiber diameter measuring instrument. The first fiber diameter measuring instrument is set above the auxiliary drawing wheel assembly to measure the diameter of the bare fiber that passes through the auxiliary drawing wheel assembly; The second fiber diameter gauge is installed below the auxiliary drawing wheel assembly to measure the diameter of the bare fiber passing through the auxiliary drawing wheel assembly; In step S3, the first fiber optic diameter measuring instrument measures the diameter of the bare fiber passing through its measurement area to obtain bare fiber diameter data D1, the second fiber optic diameter measuring instrument measures the diameter of the bare fiber passing through its measurement area to obtain bare fiber diameter data D2, and the controller compares the diameter data D2 with the target size value. When D2 is greater than the target size, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels to move closer according to the control command, thereby adjusting the distance L between the two auxiliary drawing wheels, where L=D1-X. In step S4, when D2 equals the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels away from each other according to the control command, so that the two auxiliary drawing wheels disengage from the bare fiber.
[0013] In the fiber drawing method of the fiber drawing tower drawing device provided by the present invention, X is set to 30±5μm.
[0014] According to the fiber drawing tower drawing device provided by the present invention, in step S3, the linear velocity direction of the two auxiliary drawing wheels on opposite sides is the same as the traction direction of the main drawing wheel on the bare fiber, and the magnitude of the linear velocity of the two auxiliary drawing wheels is the same as the magnitude of the linear velocity of the main drawing wheel.
[0015] According to the fiber drawing tower drawing device provided by the present invention, in step S2, the distance between the two auxiliary drawing wheels and the bare fiber is equal.
[0016] This invention provides a fiber drawing tower drawing device that measures the diameter of bare fibers entering and / or exiting auxiliary drawing rollers using a fiber diameter measuring device. A controller receives the bare fiber data collected by the fiber diameter measuring device. When the controller detects that the diameter data of the fiber diameter measuring device is greater than a set value, it sends a control command to a moving component based on the bare fiber diameter information. This causes the moving component to drive the auxiliary drawing rollers to move closer together, clamp the bare fiber, and rotate, thus drawing the bare fiber thinner between the two auxiliary drawing rollers. When the controller detects that the diameter data of the fiber diameter measuring device is equal to the set value, it sends a control command to the moving component based on the bare fiber diameter information. This causes the moving component to drive the two rotating auxiliary drawing rollers to move away from each other and disengage from the bare fiber. This achieves automatic adjustment of the distance between the two auxiliary drawing rollers, thereby improving the drawing efficiency of the bare fiber, reducing wear on the auxiliary drawing rollers, and improving the dimensional stability of the drawn fiber. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of an optical fiber drawing tower drawing device provided by the present invention.
[0019] Figure label: 1. Heating furnace; 2. Auxiliary drawing wheel assembly; 21. Auxiliary drawing wheel; 31. First displacement actuator; 32. Second displacement actuator; 4. Fiber coating device; 51. First fiber diameter gauge; 52. Second fiber diameter gauge; 6. Main drawing wheel. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.
[0021] The terms "first" and "second" in the specification and claims of this invention may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0023] The following is combined Figure 1 The fiber drawing tower 1 of the present invention describes the fiber drawing device.
[0024] The present invention provides a fiber drawing tower fiber drawing device, including a controller, a drive component, a moving component, a fiber diameter measuring component, and an auxiliary drawing wheel group 2 and a main drawing wheel 6 arranged from top to bottom. The auxiliary drawing wheel group 2 includes two auxiliary drawing wheels 21. The driving component is used to drive the main drawing wheel 6 and the two auxiliary drawing wheels 21 to rotate; Two auxiliary drawing rollers 21 are connected to a movable component, which is used to drive the two auxiliary drawing rollers 21 closer to or further away from each other. The fiber optic diameter measuring device is used to measure the diameter data of bare fibers that are inserted into and / or exited from the auxiliary drawing roller assembly; The controller is connected to the moving part and the fiber optic diameter measuring part respectively. The controller sends control commands to the moving part based on the diameter data measured by the fiber optic diameter measuring part. The moving part drives the two auxiliary wire drawing wheels 21 to move closer or further away according to the control commands.
[0025] Specifically, such as Figure 1As shown, the heating furnace 1, auxiliary drawing wheel assembly 2, and main drawing wheel 6 are arranged sequentially from top to bottom. The bare fiber passes vertically through the fiber diameter measuring device and the auxiliary drawing wheel assembly 2 before connecting to the main drawing wheel 6. This ensures that during the fiber drawing operation, the traction direction of the bare fiber coincides with the direction of gravity, avoiding the influence of gravity on the optical fiber. The fiber diameter measuring device can be located above or below the auxiliary drawing wheel assembly to measure the diameter of the bare fiber entering or exiting the assembly. Alternatively, the fiber diameter measuring device can be located both above and below the auxiliary drawing wheel assembly to simultaneously measure the diameter of the bare fiber entering and exiting the assembly. The auxiliary drawing wheel assembly 2 consists of two auxiliary drawing wheels 21. The bare fiber passes between the two auxiliary drawing wheels 21. A moving component drives the auxiliary drawing wheels 21 to move closer together and clamp the bare fiber. As the auxiliary drawing wheels 21 and the main drawing wheel 6 rotate, the bare fiber is pulled and thinned. The fiber diameter measuring device is a fiber diameter gauge, which can be positioned above or below the auxiliary drawing wheel assembly 2. The fiber diameter measuring device measures the diameter of the bare fiber in real time. The fiber diameter measuring device is connected to a controller and supports data transmission, transmitting the detected bare fiber diameter data to the controller. The controller is connected to a moving component, which controls the two auxiliary drawing wheels 21 to move closer or further apart, thus adjusting the distance between the two auxiliary drawing wheels 21.
[0026] When using the fiber drawing tower drawing device, a qualified preform is placed on the heating furnace 1 and heated. After the preform is heated, the front end of the preform forms a thick bare fiber with a small ball at the top under the action of gravity. The small ball at the top of the thick bare fiber is cut off, and then the thick bare fiber is passed sequentially between two auxiliary drawing wheels 21 and connected to the main drawing wheel 6. The driving component drives the main drawing wheel 6 and the two auxiliary drawing wheels 21 to rotate. The controller sends control commands to the moving component based on the diameter data of the bare fiber measured by the fiber diameter measuring device, and controls the auxiliary drawing wheels 21 to clamp or disengage from the bare fiber by adjusting the distance between the two auxiliary drawing wheels 21.
[0027] This invention provides an optical fiber drawing tower drawing device. It measures the diameter of bare fibers entering and / or exiting auxiliary drawing rollers by using an optical fiber diameter measuring device. A controller receives the bare fiber data collected by the optical fiber diameter measuring device. When the controller detects that the diameter data of the optical fiber diameter measuring device is greater than a set value, the controller sends a control command to a moving component based on the bare fiber diameter information collected by the optical fiber diameter measuring device. This causes the moving component to drive two rotating auxiliary drawing rollers 21 to move closer together and clamp the bare fiber, thus thinning the bare fiber positioned between the two auxiliary drawing rollers 21. When the controller detects that the diameter data of the optical fiber diameter measuring device is equal to the set value, the controller sends a control command to the moving component based on the bare fiber diameter information collected by the optical fiber diameter measuring device. This causes the moving component to drive the two rotating auxiliary drawing rollers 21 to move away from each other and disengage from the bare fiber. This achieves automatic adjustment of the distance between the two auxiliary drawing rollers 21, thereby improving the fiber thinning efficiency, reducing wear on the auxiliary drawing rollers 21, and improving the dimensional stability of the drawn optical fiber.
[0028] Furthermore, the fiber drawing tower 1 also includes a fiber coating device 4, which is positioned between the auxiliary drawing wheel group 2 and the main drawing wheel 6 to coat the drawn bare fiber. The fiber passes through the fiber coating device 4 and then connects to the main drawing wheel 6. After the bare fiber has been drawn, the drawn bare fiber is coated by the fiber coating device 4.
[0029] In one embodiment, the moving part is a forward and reverse thread module, and the two auxiliary thread-drawing wheels 21 are respectively rotatably connected to the two slides of the forward and reverse thread module. The controller drives the two slides to move closer or further apart through the forward and reverse thread module, thereby adjusting the distance between the two auxiliary thread-drawing wheels 21.
[0030] In another embodiment, such as Figure 1 As shown, the moving part can be a split structure, including a first displacement driver 31 that drives one auxiliary drawing wheel 21 to move and a second displacement driver 32 that drives another auxiliary drawing wheel 21 to move. The controller controls the first displacement driver 31 and the second displacement driver 32 to move towards or away from each other. The first displacement driver 31 and the second displacement driver 32 are set as a linear module. One auxiliary drawing wheel 21 is rotatably connected to the sliding block of the first displacement driver 31, and the other auxiliary drawing wheel 21 is rotatably connected to the sliding block of the second displacement driver 32. The controller adjusts the distance between the two auxiliary drawing wheels 21 by controlling the first displacement driver 31 and the second displacement driver 32 respectively.
[0031] Furthermore, the driving components include a first motor, a second motor, and a third motor. The first motor drives the main drawing wheel 6 to rotate, the second motor drives an auxiliary drawing wheel 21 to rotate, and the third motor drives another auxiliary drawing wheel 21 to rotate. The controller is connected to the first motor, the second motor, and the third motor respectively. By controlling the first motor, the second motor, and the third motor, the rotational speed and direction of the auxiliary drawing wheel 21 and the main drawing wheel 6 are uniformly controlled by the controller, which can effectively control the drawing speed and drawing size.
[0032] In one embodiment, the auxiliary drawing wheel 21 is made of a flexible material such as high-temperature resistant rubber. The outer circle of the auxiliary drawing wheel 21 directly contacts the optical fiber, avoiding damage to the surface of the bare fiber during the clamping process of the two auxiliary drawing wheels 21. It also applies frictional force to the optical fiber to fix the bare fiber and achieve traction and thinning of the bare fiber. The controller adjusts the spacing of the auxiliary drawing wheels 21 through the moving part, which reduces the wear of the outer circle of the auxiliary drawing wheel 21 and improves the dimensional stability of the optical fiber drawing.
[0033] In another embodiment, a protective strip is fitted onto the outer wall of the auxiliary drawing wheel 21. The auxiliary drawing wheel 21 contacts the optical fiber through the protective strip, and the protective strip applies traction force to the optical fiber as the auxiliary drawing wheel 21 rotates. The protective strip is made of a flexible material such as high-temperature resistant rubber, and the contact surface between the protective strip and the optical fiber is designed as a soft contact surface to avoid damage to the surface of the optical fiber during clamping. The protective strip and the optical fiber should also have a certain degree of friction to prevent the optical fiber from detaching from the auxiliary drawing wheel 21 while simultaneously drawing the optical fiber thinner as it rotates. The controller adjusts the spacing of the auxiliary drawing wheels 21 via a moving component, reducing wear on the protective strip and improving the dimensional stability of the drawn optical fiber. Furthermore, if the contact surface between the auxiliary drawing wheel assembly 2 and the optical fiber is damaged, the protective strip can be replaced separately, facilitating maintenance.
[0034] This invention also provides a fiber drawing method for an optical fiber drawing tower fiber drawing device, comprising the following steps: S1. Set the target size value on the controller, place the qualified preform on the heating furnace 1, heat the optical fiber preform, the front end of the preform melts under the heat, and under the action of gravity, form a relatively thick bare optical fiber with a small ball at the top. S2. Cut off the fiber ball at the initial end of the bare fiber, pull the bare fiber through the fiber diameter measuring device and the two auxiliary fiber drawing wheels 21, and then connect it to the main fiber drawing wheel 6. S3. The fiber optic diameter measuring device measures the diameter of the bare fiber passing through it to obtain the bare fiber diameter data D. The controller compares the diameter data D with the target size value. When D is greater than the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels 21 to move closer according to the control command, and adjusts the distance between the two auxiliary drawing wheels 21 to clamp the bare fiber, where L=DX. S4. The controller sends a drive signal to the drive unit. Upon receiving the drive signal, the drive unit drives the main drawing wheel 6 and the auxiliary drawing wheel 21 to rotate, applying a downward traction force to the optical fiber and thinning the bare fiber. The optical fiber diameter measuring device continuously measures the diameter of the bare fiber. When D equals the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels 21 away according to the control command, so that the two auxiliary drawing wheels 21 disengage from the bare fiber.
[0035] Specifically, the controller includes a data reading module, a data processing module, a displacement driver control module, and a speed control module, enabling real-time and effective control of the wire drawing process; In one embodiment, the fiber optic diameter measuring device is configured as a fiber optic diameter gauge, which can be positioned above the auxiliary drawing wheel assembly 2 to detect the diameter of the bare fiber entering the auxiliary drawing wheel assembly 2 in real time. Alternatively, the fiber optic diameter gauge can be positioned below the auxiliary drawing wheel assembly 2 to detect the diameter of the bare fiber exiting the auxiliary drawing wheel assembly 2 in real time. A data reading module is used to read the bare fiber diameter data D measured by the fiber optic diameter gauge. A data processing module is used to generate corresponding displacement information based on the bare fiber diameter data D and the initial position of the auxiliary drawing wheel 21, and to generate reset information after the fiber diameter data D reaches a predetermined value. A displacement driver control module transmits the displacement information or reset information generated by the data processing module to a moving component. The moving component generates control commands based on the received displacement information to control the two auxiliary drawing wheels 21 to move closer together, and generates control commands based on the received reset information to control the two auxiliary drawing wheels 21 to move away from each other, so as to return to the initial position and detach from the fiber. The speed control module uniformly controls the speed and direction of rotation of the auxiliary drawing wheel 21 and the main drawing wheel 6. Before the auxiliary drawing wheel 21 is reset, the controller needs to control the auxiliary drawing wheel 21 and the main drawing wheel 6 to rotate at the same speed and in the same direction to pull the optical fiber away from the optical fiber heating furnace 1. The moving part drives the two auxiliary drawing wheels 21 to move closer to each other to a designated position according to the displacement information sent by the controller. Then, the speed control module drives the two auxiliary drawing wheels 21 to rotate to pull the optical fiber thinner. As the optical fiber is pulled thinner, the bare fiber diameter D gradually decreases, and the distance L=DX between the two auxiliary drawing wheels 21 also gradually decreases, thereby further thinning the bare fiber. When D equals the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels 21 to move away according to the control command, so that the two auxiliary drawing wheels 21 disengage from the bare fiber.
[0036] In another embodiment, such as Figure 1As shown, the fiber optic diameter measuring device is configured as a first fiber optic diameter measuring instrument 51 and a second fiber optic diameter measuring instrument 52. The first fiber optic diameter measuring instrument 51 is set above the auxiliary drawing wheel assembly 2 to measure the diameter of the bare fiber passing through the auxiliary drawing wheel assembly 2; the second fiber optic diameter measuring instrument 52 is set below the auxiliary drawing wheel assembly 2 to measure the diameter of the bare fiber passing through the auxiliary drawing wheel assembly 2. During step S3, the first fiber optic diameter measuring instrument 51 measures the diameter of the bare fiber passing through its measurement area to obtain the bare fiber diameter data D1, and the second fiber optic diameter measuring instrument 52 measures the diameter of the bare fiber passing through its measurement area to obtain the bare fiber diameter data D2. The controller compares the diameter data D2 with the target size value. When D2 is greater than the target size, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels 21 to move closer according to the control command, thereby adjusting the distance L between the two auxiliary drawing wheels 21, where L=D1-X, and X is set to 30±5μm. During step S4, when D2 equals the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels 21 away according to the control command, so that the two auxiliary drawing wheels 21 are no longer in contact with the bare fiber.
[0037] Specifically, the data reading module reads the bare fiber size data D1 and D2 measured by the first fiber diameter gauge 51 and the second fiber diameter gauge 52; The data processing module generates corresponding displacement information based on the bare fiber size data D1 and the initial position of the auxiliary drawing wheel 21, and generates reset information after the bare fiber size data D2 reaches the predetermined value. The displacement driver control module transmits the displacement information or reset information generated by the data processing module to the moving component. The moving component generates control commands based on the received displacement information to control the two auxiliary drawing wheels 21 to move closer to each other, and generates control commands based on the received reset information to control the two auxiliary drawing wheels 21 to move further apart, so as to restore the initial position and detach from the bare fiber.
[0038] The combination of the first fiber diameter gauge 51 and the second fiber diameter gauge 52 can effectively measure the size of the bare fiber as it enters and exits the auxiliary drawing roller group 2 in real time. The controller can control the spacing between the two auxiliary drawing rollers 21 according to the diameter detected by the first and second fiber diameter gauges 51 and 52. The reduction in the gap between the two auxiliary drawing rollers 21 applies radial pressure to the fiber, accelerating the thinning of the fiber as the rollers rotate. When the second fiber diameter gauge 52 detects that the fiber diameter has reached a set value, the controller sends a control command to the moving parts to control the two auxiliary drawing rollers 21 to disengage from the bare fiber in a timely manner, thereby reducing wear on the auxiliary drawing rollers 21. Compared to a single fiber diameter gauge, the detection and control of the fiber drawing process is more precise.
[0039] In one embodiment, the diameter of the two auxiliary drawing wheels 21 is set to be the same, and the perpendicular bisector of the line connecting the centers of the two auxiliary drawing wheels 21 is set vertically. When using the fiber drawing tower drawing device, the bare fiber pulled from the fiber heating furnace coincides with the perpendicular bisector, so that the two auxiliary drawing wheels 21 are symmetrically arranged on both sides of the bare fiber, either left and right or front and back. The minimum distance between the surface of the bare fiber and the two auxiliary drawing wheels 21 is equal and is L0. When the auxiliary drawing wheel group 2 pulls and thins the bare fiber, the controller controls the rotation speed and direction of the main drawing wheel 6 and the two auxiliary drawing wheels 21. The linear velocity direction of the two auxiliary drawing wheels 21 on the opposite side is the same as the traction direction of the fiber. The magnitude of the linear velocity of the two auxiliary drawing wheels 21 is the same as the magnitude of the linear velocity of the main drawing wheel 6. The main drawing wheel 6 and the two auxiliary drawing wheels 21 apply the same downward traction force to the fiber to pull the fiber out of the fiber heating furnace 1, so as to avoid the fiber from breaking due to uneven force.
[0040] In another optional embodiment, the diameters of the two auxiliary drawing wheels 21 are set to be different, and the perpendicular bisector of the line connecting the centers of the two auxiliary drawing wheels 21 is set vertically. When using the fiber drawing tower 1 drawing device, the minimum distance between the bare fiber surface and the two auxiliary drawing wheels 21 is equal and is L0. The controller controls the rotation speed and direction of the two auxiliary drawing wheels 21. The linear velocity direction of the two auxiliary drawing wheels 21 on the opposite side is the same as the traction direction of the bare fiber. The magnitude of the linear velocity of the two auxiliary drawing wheels 21 is the same as the magnitude of the linear velocity of the main drawing wheel 6. The main drawing wheel 6 and the two auxiliary drawing wheels 21 apply the same downward traction force to the bare fiber to pull the optical fiber out of the optical fiber heating furnace 1, so as to avoid the bare fiber from breaking due to uneven force.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. An optical fiber drawing tower take-up apparatus characterized by, It includes a controller, a drive unit, a moving unit, an optical fiber diameter measuring unit, and an auxiliary fiber drawing wheel group and a main fiber drawing wheel arranged from top to bottom. The auxiliary fiber drawing wheel group includes two auxiliary fiber drawing wheels. The driving component is used to drive the main drawing wheel and the two auxiliary drawing wheels to rotate; The two auxiliary drawing wheels are connected to a movable component, which drives the two auxiliary drawing wheels to move closer to or further away from each other. The fiber optic diameter measuring device is used to measure the size data of the bare fiber that is inserted into and / or exits the auxiliary drawing wheel assembly; The controller is connected to the moving part and the fiber optic diameter measuring part respectively. The controller sends control commands to the moving part according to the size data measured by the fiber optic diameter measuring part. The moving part drives the two auxiliary wire drawing wheels to move closer or further away according to the control commands. The moving part includes a first displacement driver and a second displacement driver. The first displacement driver drives an auxiliary drawing wheel to move, and the second displacement driver drives another auxiliary drawing wheel to move. The controller is connected to the first displacement driver and the second displacement driver respectively. The driving components include a first motor, a second motor, and a third motor. The first motor drives the main drawing wheel to rotate, the second motor drives one of the auxiliary drawing wheels to rotate, and the third motor drives another of the auxiliary drawing wheels to rotate. The controller is connected to the first motor, the second motor, and the third motor respectively.
2. The optical fiber tower draw apparatus according to claim 1, wherein, The auxiliary drawing wheel is fitted with a protective belt on its outer wall, and the auxiliary drawing wheel applies traction force to the optical fiber through the protective belt.
3. A fiber drawing method for the fiber drawing tower drawing device as described in claim 1, comprising the following steps: S1. Set the target size value on the controller, place the qualified preform on the fiber drawing tower, heat the fiber preform, the front end of the preform melts under heat, and under the action of gravity, form a relatively thick bare fiber with a small ball at the top. S2. After cutting off the initial fiber ball of the bare fiber, pull the remaining bare fiber through the fiber diameter measuring device and the two auxiliary drawing rollers, and then connect it to the main drawing roller. S3. The fiber optic diameter measuring device measures the diameter of the bare fiber passing through it to obtain the bare fiber diameter data D. The controller compares the diameter data D with the target size value. When D is greater than the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels to move closer according to the control command and adjusts the distance L between the two auxiliary drawing wheels to clamp the bare fiber, where L=DX and X is set to (30±5)μm. S4. The controller sends a drive signal to the drive unit. Upon receiving the drive signal, the drive unit drives the main drawing wheel and the auxiliary drawing wheel to rotate, applying a downward traction force to the optical fiber and thinning the bare fiber. The optical fiber diameter measuring device continuously measures the diameter D of the bare fiber passing through. When D equals the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels away from the bare fiber according to the control command, so that the two auxiliary drawing wheels disengage from the bare fiber.
4. The method of drawing optical fibers according to claim 3, wherein The optical fiber diameter measuring device includes a first optical fiber diameter measuring instrument and a second optical fiber diameter measuring instrument. The first fiber diameter measuring instrument is set above the auxiliary drawing wheel assembly to measure the diameter of the bare fiber that passes through the auxiliary drawing wheel assembly; The second fiber diameter gauge is installed below the auxiliary drawing wheel assembly to measure the diameter of the bare fiber passing through the auxiliary drawing wheel assembly; In step S3, the first fiber optic diameter measuring instrument measures the diameter of the bare fiber passing through its measurement area to obtain bare fiber diameter data D1, the second fiber optic diameter measuring instrument measures the diameter of the bare fiber passing through its measurement area to obtain bare fiber diameter data D2, and the controller compares the diameter data D2 with the target size value. When D2 is greater than the target size, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels to move closer according to the control command, thereby adjusting the distance L between the two auxiliary drawing wheels, where L=D1-X. In step S4, when D2 equals the target size value, the controller sends a control command to the moving part. The moving part drives the two auxiliary drawing wheels away from each other according to the control command, so that the two auxiliary drawing wheels disengage from the bare fiber.
5. The method of drawing optical fibers according to claim 3 or 4, characterized in that, In step S3, the linear velocity direction of the two auxiliary drawing wheels on opposite sides is the same as the traction direction of the main drawing wheel on the bare fiber, and the magnitude of the linear velocity of the two auxiliary drawing wheels is the same as the magnitude of the linear velocity of the main drawing wheel.
6. The method of drawing optical fibers according to claim 3 or 4, characterized in that, In step S2, the distance between the two auxiliary drawing wheels and the bare fiber is equal.