Optical fiber drawing tower drawing device and method

Abstract

The invention provides an optical fiber drawing tower wire drawing device which comprises a controller, a driving part, a moving part, an optical fiber diameter measuring part, an auxiliary wire drawing wheel set and a main wire drawing wheel, the auxiliary wire drawing wheel set and the main wire drawing wheel are sequentially arranged from top to bottom, and the auxiliary wire drawing wheel set comprises two auxiliary wire drawing wheels which are connected to the moving part; the moving part is used for driving the two auxiliary wire drawing wheels to get close or away; the optical fiber diameter measuring piece is used for measuring diameter data of the bare fiber penetrating in or out of the auxiliary wire drawing wheel set; according to the fiber drawing tower fiber drawing device provided by the invention, the diameter size of a bare fiber penetrating into the auxiliary fiber drawing wheel set is measured by arranging the fiber diameter measuring piece, and the controller sends a control command to the moving piece according to the diameter size information of the bare fiber collected by the fiber diameter measuring piece; therefore, the two rotating auxiliary wire drawing wheels are driven by the moving part to adjust the distance in real time and get away from each other to be separated from a bare fiber after reaching the specified diameter of the bare fiber, so that the wire drawing efficiency of the optical fiber is improved, the abrasion of the belt of the auxiliary wire drawing wheels is reduced, and the wire drawing size stability of the optical fiber is improved.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber processing equipment, and in particular to an optical fiber drawing tower drawing device and method. Background Art

[0002] The manufacturing process of optical fiber usually includes preform preparation, preform processing and optical fiber drawing, etc. Among them, the optical fiber drawing process determines the mechanical strength, transmission characteristics and service life of the optical fiber, which is very important to ensure the quality of the optical fiber.

[0003] Fiber drawing technology refers to the process of drawing fiber preforms into specified thin diameters using high temperature and high pressure technology. The specific process includes feeding the fiber preform into the high temperature furnace of the fiber drawing tower, heating the fiber preform to the softening point and then naturally falling to form a filament with small balls, cutting off the thick fiber ball at the initial end of the bare fiber, drawing the fiber thinner through the auxiliary drawing wheel and the main drawing wheel, and finally coating the drawn fiber.

[0004] In order to draw the bare fiber to the target size, it is necessary to ensure that the auxiliary drawing wheel can clamp the bare fiber and drive the bare fiber to move. In the existing production process, the position of the auxiliary drawing wheel is usually set according to manual experience. The distance between the two auxiliary drawing wheels is generally smaller than the bare fiber size, and the position will not change after setting. If the distance between the two auxiliary drawing wheels is set too large, the effect of drawing the bare fiber thin will not be effectively achieved. If the distance between the two auxiliary drawing wheels is set too small, since the initial bare fiber is thicker, it is very easy to cause the auxiliary drawing wheel and the bare wire to wear and form grooves at the contact point, resulting in the bare fiber being gradually drawn thin. The auxiliary drawing wheel cannot provide enough friction to drive the bare fiber to move downward, and thus cannot effectively achieve the control of the fiber drawing size. The manual control method to adjust the position of the auxiliary drawing wheel not only fails to effectively control the drawing size stability of the optical fiber, but also requires frequent replacement of the auxiliary drawing wheel, which wastes economic and time costs. Summary of the invention

[0005] The invention provides an optical fiber drawing tower drawing device, which is used to solve the defect in the prior art that the auxiliary drawing wheel cannot effectively control the dimensional stability of the optical fiber drawing.

[0006] According to the present invention, a fiber drawing tower drawing device includes a controller, a driving member, a moving member, a fiber diameter measuring member, and an auxiliary drawing wheel group and a main drawing wheel arranged in sequence from top to bottom, wherein the auxiliary drawing wheel group includes two auxiliary drawing wheels; The driving member is used to drive the main spinning wheel and the two auxiliary spinning wheels to rotate; The two auxiliary spinning wheels are connected to a moving part, and the moving part is used to drive the two auxiliary spinning wheels to move closer or farther away; The optical fiber diameter measuring member is used to measure the size data of the bare fiber passing into and / or passing out of the auxiliary spinning wheel assembly; The controller is connected to the moving part and the optical fiber diameter measuring part respectively. The controller sends a control instruction to the moving part according to the size data measured by the optical fiber diameter measuring part. The moving part drives the two auxiliary spinning wheels to move closer or farther away according to the control instruction.

[0007] According to the present invention, an optical fiber drawing tower drawing device further includes an optical fiber coating device, which is arranged between the auxiliary drawing wheel group and the main drawing wheel for coating the drawn bare fiber.

[0008] According to an optical fiber drawing tower drawing device provided by the present invention, the moving part includes a first displacement driver and a second displacement driver, the first displacement driver drives an auxiliary drawing wheel to move, the second displacement driver drives another auxiliary drawing wheel to move, and the controller is respectively connected to the first displacement driver and the second displacement driver.

[0009] According to an optical fiber drawing tower drawing device provided by the present invention, 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, and the third motor drives another of the auxiliary drawing wheels to rotate, and the controller is respectively connected to the first motor, the second motor and the third motor.

[0010] According to an optical fiber drawing tower drawing device provided by the present invention, a protective belt is sleeved on the outer wall of the auxiliary drawing wheel, and the auxiliary drawing wheel applies traction to the optical fiber through the protective belt.

[0011] The present invention also provides a fiber drawing method of 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 optical fiber drawing tower, heat the optical fiber preform, melt the front end of the preform, and form a thicker bare fiber with a small ball on the top under the action of gravity; S2, after cutting off the fiber ball at the initial end of the bare fiber, pull the remaining bare fiber through the fiber diameter measuring piece and between the two auxiliary spinning wheels, and then connect it to the main spinning wheel; S3, the optical fiber diameter measuring component measures the diameter size data of the bare fiber passing through to obtain the bare fiber diameter size data D, and the controller compares the diameter size data D with the target size value; when D is greater than the target size value, the controller sends a control instruction to the moving component, and the moving component drives the two auxiliary spinning wheels to approach according to the control instruction, adjusts the distance L between the two auxiliary spinning wheels, and clamps the bare fiber, where L=DX; S4. The controller sends a driving signal to the driving part. The driving part that receives the driving signal drives the main spinning wheel and the auxiliary spinning wheel to rotate to apply downward traction to the optical fiber, so as to thin the bare fiber. The optical fiber diameter measuring part continuously measures the diameter dimension data D of the bare fiber passing through. When D is equal to the target dimension value, the controller sends a control instruction to the moving part. The moving part drives the two auxiliary spinning wheels away according to the control instruction, so that the two auxiliary spinning wheels are out of contact with the bare fiber.

[0012] According to the fiber drawing method of the fiber drawing tower fiber 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 optical fiber diameter meter is arranged above the auxiliary spinning wheel group to measure the diameter size data of the bare fiber passing through the auxiliary spinning wheel group; The second optical fiber diameter measuring instrument is arranged below the auxiliary spinning wheel assembly to measure the diameter size data of the bare fiber passing through the auxiliary spinning wheel assembly; In step S3, the first optical fiber diameter gauge measures the diameter of the bare fiber passing through its measuring area to obtain bare fiber diameter data D1, the second optical fiber diameter gauge measures the diameter of the bare fiber passing through its measuring 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 value, the controller sends a control instruction to the moving part, and the moving part drives the two auxiliary spinning wheels to approach each other according to the control instruction, thereby adjusting the distance L between the two auxiliary spinning wheels, where L=D1-X; In step S4, when D2 is equal to the target size value, the controller sends a control instruction to the moving part, and the moving part drives the two auxiliary spinning wheels away according to the control instruction, so that the two auxiliary spinning wheels are out of contact with the bare fiber.

[0013] According to the optical fiber drawing tower drawing method provided by the present invention, X is set to 30±5 μm.

[0014] According to the drawing method of the optical fiber drawing tower drawing device provided by the present invention, in step S3, the linear speed direction of the two auxiliary drawing wheels on the opposite side is the same as the pulling direction of the main drawing wheel on the bare fiber, and the linear speed of the two auxiliary drawing wheels is the same as the linear speed of the main drawing wheel.

[0015] According to the optical fiber drawing tower drawing method provided by the present invention, in step S2, the distances between the two auxiliary drawing wheels and the bare fiber are equal.

[0016] The present invention provides an optical fiber drawing tower drawing device, which measures the diameter size of the bare fiber passing into and / or out of the auxiliary drawing wheel group by setting an optical fiber diameter measuring part, and a controller receives the bare fiber data collected by the optical fiber diameter measuring part. When the controller detects that the diameter data of the optical fiber diameter measuring part is greater than the set value, the controller sends a control command to the moving part according to the bare fiber diameter size information collected by the optical fiber diameter measuring part, thereby driving the auxiliary drawing wheels to approach each other and rotate to clamp the bare fiber through the moving part, and drawing the bare fiber arranged between the two auxiliary drawing wheels; when the controller detects that the diameter data of the optical fiber diameter measuring part is equal to the set value, the controller sends a control command to the moving part according to the bare fiber diameter size information collected by the optical fiber diameter measuring part, thereby driving the two rotating auxiliary drawing wheels to move away from each other and away from the bare fiber through the moving part, thereby realizing automatic adjustment of the distance between the two auxiliary drawing wheels, thereby improving the drawing efficiency of the bare fiber, reducing the wear on the auxiliary drawing wheels, and improving the dimensional stability of the optical fiber drawing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of an optical fiber drawing tower drawing device provided by the present invention.

[0019] Reference numerals: 1. Heating furnace; 2. Auxiliary spinning wheel group; 21. Auxiliary spinning wheel; 31. First displacement driver; 32. Second displacement driver; 4. Optical fiber coating device; 51. First optical fiber diameter gauge; 52. Second optical fiber diameter gauge; 6. Main spinning wheel. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The features of the terms "first" and "second" in the specification and claims of the present invention may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects associated before and after are in an "or" relationship.

[0022] In the description of the present invention, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] Combine the following Figure 1 The optical fiber drawing tower 1 drawing device of the present invention is described.

[0024] The present invention provides an optical fiber drawing tower drawing device, comprising a controller, a driving part, a moving part, an optical fiber diameter measuring part, and an auxiliary drawing wheel group 2 and a main drawing wheel 6 arranged in sequence from top to bottom, wherein the auxiliary drawing wheel group 2 comprises two auxiliary drawing wheels 21; The driving member is used to drive the main spinning wheel 6 and the two auxiliary spinning wheels 21 to rotate; The two auxiliary spinning wheels 21 are connected to a moving part, and the moving part is used to drive the two auxiliary spinning wheels 21 to move closer or farther away; The optical fiber diameter measuring device is used to measure the diameter data of the bare fiber passing into and / or out of the auxiliary spinning wheel assembly; The controller is connected to the moving part and the optical fiber diameter measuring part respectively. The controller sends a control instruction to the moving part according to the diameter data measured by the optical fiber diameter measuring part. The moving part drives the two auxiliary spinning wheels 21 to move closer or farther according to the control instruction.

[0025] Specifically, Figure 1As shown, the heating furnace 1, the auxiliary spinning wheel group 2 and the main spinning wheel 6 are arranged in sequence from top to bottom. The bare fiber vertically passes through the optical fiber diameter measuring device and the auxiliary spinning wheel group 2 and is connected to the main spinning wheel 6, so that when the bare fiber is spinning, the pulling direction of the bare fiber coincides with the direction of gravity, avoiding the influence of gravity on the optical fiber. The optical fiber diameter measuring device can be set on the upper side or the lower side of the auxiliary spinning wheel group to measure the diameter data of the bare fiber passing into or out of the auxiliary spinning wheel group. The optical fiber diameter measuring device can also be set on the upper side and the lower side of the auxiliary spinning wheel group to measure the diameter data of the bare fiber passing into and out of the auxiliary spinning wheel group at the same time. The auxiliary spinning wheel group 2 is set as two auxiliary spinning wheels 21, and the bare fiber passes between the two auxiliary spinning wheels 21. The moving part drives the auxiliary spinning wheels 21 to approach each other to clamp the bare fiber. As the auxiliary spinning wheels 21 and the main spinning wheel 6 rotate, the bare fiber is pulled and thinned. The optical fiber diameter measuring part is set as an optical fiber diameter gauge, which can be set above or below the auxiliary spinning wheel group 2. The optical fiber diameter measuring part measures the diameter size of the bare fiber in real time. The optical fiber diameter measuring part is connected to the controller, supports the data transmission function, and can transmit the detected bare fiber diameter size data to the controller. The controller is connected to the moving part so as to control the two auxiliary spinning wheels 21 to approach or move away from each other through the moving part, so as to adjust the distance between the two auxiliary spinning wheels 21.

[0026] When using the optical fiber drawing tower drawing device, the preform rod that has passed the test is placed on the heating furnace 1, and the optical fiber preform rod is heated. After the front end of the preform rod is heated, a thick bare fiber with a small ball on the top is formed under the action of gravity; the small ball on the top of the thick bare fiber is cut off, and then the thick bare fiber is passed through the two auxiliary drawing wheels 21 in turn and connected to the main drawing wheel 6, and the driving part drives the main drawing wheel 6 and the two auxiliary drawing wheels 21 to rotate. The controller sends a control instruction to the moving part according to the diameter size data of the bare fiber measured by the optical fiber diameter measuring part, and controls the auxiliary drawing wheels 21 to clamp or disengage the bare fiber by adjusting the spacing between the two auxiliary drawing wheels 21.

[0027] The present invention provides an optical fiber drawing tower drawing device, which measures the diameter size of a bare fiber that passes into and / or out of an auxiliary drawing wheel group by setting an optical fiber diameter measuring part, and a controller receives the bare fiber data collected by the optical fiber diameter measuring part. When the controller detects that the diameter data of the optical fiber diameter measuring part is greater than a set value, the controller sends a control command to a moving part according to the bare fiber diameter size information collected by the optical fiber diameter measuring part, thereby driving two rotating auxiliary drawing wheels 21 to approach each other and clamp the bare fiber through the moving part, and drawing the bare fiber arranged between the two auxiliary drawing wheels 21; when the controller detects that the diameter data of the optical fiber diameter measuring part is equal to the set value, the controller sends a control command to the moving part according to the bare fiber diameter size information collected by the optical fiber diameter measuring part, thereby driving the two rotating auxiliary drawing wheels 21 to move away from each other and away from the bare fiber through the moving part, thereby realizing automatic adjustment of the distance between the two auxiliary drawing wheels 21, thereby improving the drawing efficiency of the optical fiber, reducing the wear on the auxiliary drawing wheels 21, and improving the dimensional stability of the optical fiber drawing.

[0028] Furthermore, the fiber drawing tower 1 drawing device further includes a fiber coating device 4, which is arranged between the auxiliary drawing wheel group 2 and the main drawing wheel 6 for coating the finished bare fiber. The optical fiber passes through the fiber coating device 4 and is then connected to the main drawing wheel 6. After the bare fiber is finished drawing, the drawn bare fiber is coated by the fiber coating device 4.

[0029] In one embodiment, the movable part uses a positive and negative tooth module, and the two auxiliary spinning wheels 21 are rotatably connected to the two slides of the positive and negative tooth module respectively. The controller drives the two slides to move closer or farther from each other through the positive and negative tooth module, thereby adjusting the distance between the two auxiliary spinning wheels 21.

[0030] In another embodiment, if Figure 1 As shown, the movable part can optionally adopt a split structure, including a first displacement driver 31 for driving an auxiliary spinning wheel 21 to move and a second displacement driver 32 for driving another auxiliary spinning wheel 21 to move. The first displacement driver 31 and the second displacement driver 32 are controlled by a controller to move toward or away from each other. The first displacement driver 31 and the second displacement driver 32 are configured as linear modules. One auxiliary spinning wheel 21 is rotatably connected to a sliding block of the first displacement driver 31, and the other auxiliary spinning wheel 21 is rotatably connected to a sliding block of the second displacement driver 32. The controller adjusts the distance between the two auxiliary spinning wheels 21 by separately controlling the first displacement driver 31 and the second displacement driver 32.

[0031] Furthermore, the driving member includes a first motor, a second motor and a third motor, the first motor drives the main spinning wheel 6 to rotate, the second motor drives an auxiliary spinning wheel 21 to rotate, and the third motor drives another auxiliary spinning wheel 21 to rotate, and the controller is connected to the first motor, the second motor and the third motor respectively. The controller controls the first motor, the second motor and the third motor, so that the rotation speed and direction of the auxiliary spinning wheel 21 and the main spinning wheel 6 are uniformly controlled by the controller, which can effectively control the wire drawing speed and wire drawing size.

[0032] In one embodiment, the auxiliary drawing wheel 21 is entirely configured to be made of a flexible material such as high temperature resistant rubber, and the outer circle of the auxiliary drawing wheel 21 is in direct flexible contact with the optical fiber to avoid damage to the surface of the bare fiber during the clamping process of the two auxiliary drawing wheels 21, and friction is applied to the optical fiber to fix the bare fiber to achieve traction and thinning of the bare fiber. The controller adjusts the spacing of the auxiliary drawing wheels 21 through moving parts, thereby reducing the wear of the outer circle of the auxiliary drawing wheel 21 and improving the dimensional stability of the optical fiber drawing.

[0033] In another embodiment, a protective belt is sleeved on the outer wall of the auxiliary spinning wheel 21, and the auxiliary spinning wheel 21 contacts the optical fiber through the protective belt. The protective belt rotates with the auxiliary spinning wheel 21 to apply traction to the optical fiber. The protective belt is set to a flexible material such as high-temperature resistant rubber, and the contact surface between the protective belt and the optical fiber is set to a soft contact surface to avoid damaging the surface of the optical fiber during the clamping process. The protective belt and the optical fiber should have a certain friction force, which can prevent the optical fiber from being separated from the clamping of the auxiliary spinning wheel 21, and can drive the optical fiber to rotate with the auxiliary spinning wheel 21 to draw the optical fiber. The controller adjusts the spacing of the auxiliary spinning wheel 21 through the moving parts, which reduces the wear of the protective belt and improves the dimensional stability of the optical fiber drawing. On the other hand, when the contact surface of the auxiliary spinning wheel group 2 with the optical fiber is damaged, the protective belt can be replaced separately for easy maintenance.

[0034] The present invention also provides a fiber drawing method of an optical fiber drawing tower fiber drawing device, comprising the following steps: S1. Set the target size value on the controller, place the preform rod that has passed the test on the heating furnace 1, heat the optical fiber preform rod, and melt the front end of the preform rod under the heat. Under the action of gravity, a thicker bare optical fiber with a small ball on the top is formed; S2, cutting off the fiber ball at the initial end of the bare fiber, pulling the bare fiber through the fiber diameter measuring piece and between the two auxiliary spinning wheels 21, and then connecting to the main spinning wheel 6; S3, the optical fiber diameter measuring component measures the diameter size data of the bare fiber passing through to obtain the bare fiber diameter size data D, and the controller compares the diameter size data D with the target size value; when D is greater than the target size value, the controller sends a control instruction to the moving component, and the moving component drives the two auxiliary spinning wheels 21 to approach according to the control instruction, adjusts the distance between the two auxiliary spinning wheels 21, and clamps the bare fiber, wherein L=DX; S4, the controller sends a driving signal to the driving part, and the driving part that receives the driving signal drives the main spinning wheel 6 and the auxiliary spinning wheel 21 to rotate to apply downward traction to the optical fiber, so as to thin the bare fiber; the optical fiber measuring part continuously passes through the bare fiber diameter size data to measure, and when D is equal to the target size value, the controller sends a control instruction to the moving part, and the moving part drives the two auxiliary spinning wheels 21 away according to the control instruction, so that the two auxiliary spinning wheels 21 are out of contact with 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 to achieve real-time and effective control of the wire drawing process; In one embodiment, the optical fiber diameter measuring part is set as an optical fiber diameter gauge, which can be set above the auxiliary spinning wheel group 2 to perform real-time detection of the diameter size data of the bare fiber passing through the auxiliary spinning wheel group 2. The optical fiber diameter gauge can also be set below the auxiliary spinning wheel group 2 to perform real-time detection of the diameter size data of the bare fiber passing through the auxiliary spinning wheel group 2. The data reading module is used to read the bare fiber diameter data D measured by the optical fiber diameter gauge; the 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 spinning wheel 21 through data processing, and generate reset information after the optical fiber diameter data D reaches a predetermined value; the displacement driver control module transmits the displacement information or reset information generated by the data processing module to the moving part; the moving part generates a control command based on the received displacement information to control the two auxiliary spinning wheels 21 to approach each other, and generates a control command based on the received reset information to control the two auxiliary spinning wheels 21 to move away from each other, so as to restore to the initial position and detach from the optical fiber. The speed control module uniformly controls the speed and rotation direction of the auxiliary spinning wheel 21 and the main spinning wheel 6. Before the auxiliary spinning wheel 21 is reset, the controller needs to control the auxiliary spinning wheel 21 to rotate at the same speed as the main spinning wheel 6 and the rotation direction of both of them pulls the optical fiber away from the optical fiber heating furnace 1. The moving part drives the two auxiliary spinning wheels 21 to approach each other to the specified position according to the displacement information sent by the controller, and then drives the two auxiliary spinning wheels 21 to rotate through the speed control module to draw the optical fiber thinner. As the optical fiber is drawn thinner, the bare fiber diameter size data D gradually decreases, and the spacing L=DX between the two auxiliary spinning wheels 21 also gradually decreases, thereby further drawing the bare fiber thinner. When D is equal to the target size value, the controller sends a control instruction to the moving part, and the moving part drives the two auxiliary spinning wheels 21 away according to the control instruction, so that the two auxiliary spinning wheels 21 are out of contact with the bare fiber.

[0036] In another embodiment, if Figure 1As shown, the optical fiber diameter measuring device is configured as a first optical fiber diameter measuring instrument 51 and a second optical fiber diameter measuring instrument 52. The first optical fiber diameter measuring instrument 51 is configured above the auxiliary spinning wheel assembly 2 to measure the diameter size data of the bare fiber passing through the auxiliary spinning wheel assembly 2; the second optical fiber diameter measuring instrument 52 is configured below the auxiliary spinning wheel assembly 2 to measure the diameter size data of the bare fiber passing through the auxiliary spinning wheel assembly 2; When performing step S3, the first optical fiber diameter gauge 51 measures the bare fiber diameter size data passing through its measuring area to obtain bare fiber diameter size data D1, and the second optical fiber diameter gauge 52 measures the bare fiber diameter size data passing through its measuring area to obtain bare fiber diameter size data D2, and the controller compares the diameter size data D2 with the target size value; When D2 is greater than the target size value, the controller sends a control instruction to the moving part, and the moving part drives the two auxiliary spinning wheels 21 to approach each other according to the control instruction, thereby adjusting the distance L between the two auxiliary spinning wheels 21, where L=D1-X, and X is set to 30±5μm; During step S4, when D2 is equal to the target size value, the controller sends a control instruction to the moving part, and the moving part drives the two auxiliary spinning wheels 21 away according to the control instruction, so that the two auxiliary spinning wheels 21 are out of contact with the bare fiber.

[0037] Specifically, the data reading module reads the size data D1 and D2 of the bare fiber measured by the first optical fiber diameter meter 51 and the second optical fiber diameter meter 52; The data processing module generates corresponding displacement information through data processing according to the bare fiber size data D1 and the initial position of the auxiliary spinning wheel 21, and generates reset information after the bare fiber size data D2 reaches a predetermined value; The displacement driver control module transmits the displacement information or reset information generated by the data processing module to the moving part. The moving part generates a control command according to the received displacement information to control the two auxiliary spinning wheels 21 to approach each other, and generates a control command according to the received reset information to control the two auxiliary spinning wheels 21 to move away from each other, so as to restore to the initial position and separate from the bare fiber.

[0038] The first fiber optic diameter gauge 51 is combined with the second fiber optic diameter gauge 52 to effectively measure the size of the bare fiber passing through and out of the auxiliary spinning wheel group 2 in real time. The controller can control the spacing between the two auxiliary spinning wheels 21 according to the diameter size detected by the first fiber optic diameter gauge 51 and the second fiber optic diameter gauge 52. The reduction of the gap between the two auxiliary spinning wheels 21 exerts radial pressure on the optical fiber. As the two auxiliary spinning wheels 21 rotate, the drawing of the optical fiber is accelerated. When the second fiber optic diameter gauge 52 detects that the diameter size of the optical fiber reaches the set value, the controller sends a control instruction to the moving part to control the two auxiliary spinning wheels 21 to break away from the bare fiber in time, thereby reducing the wear on the auxiliary spinning wheels 21. Compared with a single fiber optic diameter gauge, the detection and control of the optical fiber drawing process is more accurate.

[0039] In one embodiment, the diameters of the two auxiliary spinning wheels 21 are set to be the same, and the midline of the connecting line of the centers of the two auxiliary spinning wheels 21 is set vertically. When the optical fiber drawing tower spinning device is used, the bare fiber pulled out from the optical fiber heating furnace coincides with the midline, so that the two auxiliary spinning wheels 21 are symmetrically arranged on both sides of the bare fiber left and right or front and back, and the minimum spacing between the bare fiber surface and the two auxiliary spinning wheels 21 is equal and both are L0. When the auxiliary spinning wheel group 2 pulls and thins the bare fiber, the controller controls the rotation speed and direction of the main spinning wheel 6 and the two auxiliary spinning wheels 21. The linear speed direction of the two auxiliary spinning wheels 21 facing each other is the same as the pulling direction of the optical fiber, and the linear speed of the two auxiliary spinning wheels 21 is the same as the linear speed of the main spinning wheel 6. The main spinning wheel 6 and the two auxiliary spinning wheels 21 apply the same speed and downward traction force to the optical fiber to pull the optical fiber out of the optical fiber heating furnace 1 to prevent the optical fiber from breaking due to uneven force.

[0040] In another optional embodiment, the diameters of the two auxiliary spinning wheels 21 are set to be different, and the midline of the connecting line of the centers of the two auxiliary spinning wheels 21 is set vertically. When the optical fiber drawing tower 1 is used for the drawing device, the minimum spacing between the bare fiber surface and the two auxiliary spinning wheels 21 is equal and both are L0. The controller controls the rotation speed and direction of the two auxiliary spinning wheels 21. The linear speed direction of the two auxiliary spinning wheels 21 facing each other is the same as the traction direction of the bare fiber. The linear speed of the two auxiliary spinning wheels 21 is the same as the linear speed of the main spinning wheel 6. The main spinning wheel 6 and the two auxiliary spinning wheels 21 apply the same speed and downward traction force to the bare fiber to pull the optical fiber out of the optical fiber heating furnace 1 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical fiber drawing tower drawing device, characterized in that: It includes a controller, a driving part, a moving part, an optical fiber diameter measuring part, and an auxiliary spinning wheel group and a main spinning wheel arranged in sequence from top to bottom, wherein the auxiliary spinning wheel group includes two auxiliary spinning wheels; The driving member is used to drive the main spinning wheel and the two auxiliary spinning wheels to rotate; The two auxiliary spinning wheels are connected to a moving part, and the moving part is used to drive the two auxiliary spinning wheels to move closer or farther away; The optical fiber diameter measuring member is used to measure the size data of the bare fiber passing into and / or passing out of the auxiliary spinning wheel assembly; The controller is connected to the moving part and the optical fiber diameter measuring part respectively. The controller sends a control instruction to the moving part according to the size data measured by the optical fiber diameter measuring part. The moving part drives the two auxiliary spinning wheels to move closer or farther away according to the control instruction.

2. The optical fiber drawing tower drawing device according to claim 1, characterized in that: The moving part includes a first displacement driver and a second displacement driver. The first displacement driver drives an auxiliary spinning wheel to move, and the second displacement driver drives another auxiliary spinning wheel to move. The controller is respectively connected to the first displacement driver and the second displacement driver.

3. The optical fiber drawing tower drawing device according to claim 1, characterized in that: The driving member includes a first motor, a second motor and a third motor. The first motor drives the main spinning wheel to rotate, the second motor drives one of the auxiliary spinning wheels to rotate, and the third motor drives another of the auxiliary spinning wheels to rotate. The controller is connected to the first motor, the second motor and the third motor respectively.

4. The optical fiber drawing tower drawing device according to any one of claims 1 to 3, characterized in that: The outer wall of the auxiliary spinning wheel is sleeved with a protective belt, and the auxiliary spinning wheel applies traction to the optical fiber through the protective belt.

5. A method for drawing a fiber using a fiber drawing tower drawing device according to claim 1, comprising the following steps: S1. Set the target size value on the controller, place the qualified preform on the optical fiber drawing tower, heat the optical fiber preform, melt the front end of the preform, and form a thicker bare fiber with a small ball on the top under the action of gravity; S2, after cutting off the fiber ball at the initial end of the bare fiber, pull the remaining bare fiber through the fiber diameter measuring piece and between the two auxiliary spinning wheels, and then connect it to the main spinning wheel; S3, the optical fiber diameter measuring component measures the diameter size data of the bare fiber passing through to obtain the bare fiber diameter size data D, and the controller compares the diameter size data D with the target size value; when D is greater than the target size value, the controller sends a control instruction to the moving component, and the moving component drives the two auxiliary spinning wheels to approach according to the control instruction, adjusts the distance L between the two auxiliary spinning wheels, and clamps the bare fiber, where L=DX; S4. The controller sends a driving signal to the driving part. The driving part that receives the driving signal drives the main spinning wheel and the auxiliary spinning wheel to rotate to apply downward traction to the optical fiber, so as to thin the bare fiber. The optical fiber diameter measuring part continuously measures the diameter dimension data D of the bare fiber passing through. When D is equal to the target dimension value, the controller sends a control instruction to the moving part. The moving part drives the two auxiliary spinning wheels away according to the control instruction, so that the two auxiliary spinning wheels are out of contact with the bare fiber.

6. The optical fiber drawing tower drawing method according to claim 5, characterized in that: The optical fiber diameter measuring device comprises a first optical fiber diameter measuring instrument and a second optical fiber diameter measuring instrument; The first optical fiber diameter meter is arranged above the auxiliary spinning wheel group to measure the diameter size data of the bare fiber passing through the auxiliary spinning wheel group; The second optical fiber diameter measuring instrument is arranged below the auxiliary spinning wheel assembly to measure the diameter size data of the bare fiber passing through the auxiliary spinning wheel assembly; In step S3, the first optical fiber diameter gauge measures the diameter of the bare fiber passing through its measuring area to obtain bare fiber diameter data D1, the second optical fiber diameter gauge measures the diameter of the bare fiber passing through its measuring 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 value, the controller sends a control instruction to the moving part, and the moving part drives the two auxiliary spinning wheels to approach each other according to the control instruction, thereby adjusting the distance L between the two auxiliary spinning wheels, where L=D1-X; In step S4, when D2 is equal to the target size value, the controller sends a control instruction to the moving part, and the moving part drives the two auxiliary spinning wheels away according to the control instruction, so that the two auxiliary spinning wheels are out of contact with the bare fiber.

7. The optical fiber drawing tower drawing method according to claim 5 or 6, characterized in that: X is set to (30±5) μm.

8. The optical fiber drawing tower drawing device according to claim 5 or 6, characterized in that: In step S3, the linear speed directions of the two auxiliary spinning wheels on the opposite sides are the same as the pulling direction of the bare fiber by the main spinning wheel, and the linear speeds of the two auxiliary spinning wheels are the same as that of the main spinning wheel.

9. The optical fiber drawing tower drawing device according to claim 5 or 6, characterized in that: In step S2, the distances between the two auxiliary spinning wheels and the bare fiber are equal.

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