Optical fiber drawing device

Abstract

The present invention relates to the field of optical fiber drawing, and specifically relates to an optical fiber drawing device, which includes a frame plate. A heating furnace, a preform, and a winding disk are arranged on the frame plate. A midpoint orientation mechanism is further provided on the frame plate. The midpoint orientation mechanism is provided with an induction component, and the midpoint orientation mechanism is also provided with a control component for regulating the position of the preform. Through the positioning of the optical fiber by the midpoint orientation mechanism of the present invention, the optical fiber is made to maintain a drooping state in the heating furnace. During the process of winding the optical fiber on the winding disk, first, the induction component detects the inclination amplitude of the optical fiber to judge the position where the optical fiber needs to be adjusted, and then transmits the detected signal to the control component, causing the control component to drive the midpoint orientation mechanism according to the inclination amplitude of the optical fiber, so that the midpoint orientation mechanism can accurately position the optical fiber to the original drooping position, improving the production efficiency of the optical fiber, avoiding the abrasion of the optical fiber, and ensuring the quality of the optical fiber.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber drawing, and more particularly to an optical fiber drawing device. Background Art

[0002] Optical fiber drawing is a process in which a preform is melted at high temperature by a drawing machine to form an optical fiber with an outer diameter of 125 micrometers. The quartz optical fiber drawing machine is more than 10 meters high. The preform is placed in a heating furnace at the top of the drawing machine. When the furnace temperature rises to about 2200 °C, the viscosity of the tip of the rod becomes low, and it gradually sags and thins by its own weight to become a bare optical fiber. The bare optical fiber passes through a laser diameter measuring monitor and then enters a coating and curing system. The coated optical fiber then passes through a traction roller and onto a reel.

[0003] The optical fiber drawing tower is an important device for optical fiber manufacturing. Generally, the optical fiber preform is hung in the optical fiber drawing tower in an eccentric state relative to the quartz hanging rod. During the drawing process, due to the offset of the longitudinal center of the optical fiber preform, the optical fiber between the preform and the winch will tilt, causing the optical fiber to touch other devices in the optical fiber drawing tower, resulting in wear of the optical fiber, thereby reducing the quality of the optical fiber product. Moreover, if the optical fiber products are wound onto the reel in a disorderly manner, it will cause mutual friction between the optical fibers, resulting in wear of the optical fibers.

[0004] The currently disclosed Chinese patent CN201711018744.6, an efficient optical fiber drawing tower based on the Internet of Things, includes a main body, two guide rails, a first support rod, a reel, a second support rod, a winch, an optical fiber, a heating furnace, an optical fiber preform, an adjustment mechanism, and a guiding mechanism. The two guide rails are respectively arranged on the upper inner walls of the main body. The adjustment mechanism is erected between the two guide rails. The heating furnace is arranged in the middle of the main body. The second support rod is arranged at the lower end of the main body. The winch is hinged to the second support rod. The first support rod is arranged at the lower end of one side of the main body. The reel is hinged to the first support rod. The guiding mechanism is arranged above the first support rod. The optical fiber preform is arranged below the adjustment mechanism. The optical fiber bypasses the winch and the guiding mechanism and is wound on the reel. The adjustment mechanism includes two moving components, a first motor, a lead screw, a first moving block, and a third support rod. The third support rod is arranged between the two moving components. The first motor is arranged on one side above the third support rod. The first motor is in transmission connection with the lead screw. The first moving block is sleeved on the third support rod and also sleeved on the lead screw. The moving component includes a connecting rod, a second motor, a driving shaft, and a gear. The connecting rod is arranged at one end of the third support rod. The second motor is arranged on the side of the connecting rod close to the third support rod. The second motor is in transmission connection with the gear through the driving shaft.

[0005] According to the above-mentioned patent, the longitudinal center position of the fiber preform can be adjusted by an adjusting mechanism, so that the drawn optical fiber will not tilt in the fiber drawing tower, thereby reducing the contact between the optical fiber and other devices. However, this method of moving the preform is likely to cause the optical fiber to become disordered during production, and the directional guiding of the optical fiber by the guiding mechanism is likely to cause the optical fiber to be easily worn. Therefore, there is a need for an adjusting mechanism that can keep the optical fiber in the center position in the heating furnace at present. Summary of the Invention

[0006] Aiming at the problems existing in the prior art, a fiber drawing device is provided. Through the positioning of the optical fiber by the midpoint orientation mechanism, the present invention makes the optical fiber maintain a hanging state in the heating furnace. During the process of winding the optical fiber on the winding disc, first, the inclination amplitude of the optical fiber is detected by the induction component to judge the position to be adjusted for the optical fiber, and then the detected signal is transmitted to the control component, so that the control component drives the midpoint orientation mechanism according to the inclination amplitude of the optical fiber, enabling the midpoint orientation mechanism to accurately position the optical fiber to the original hanging position, improving the production efficiency of the optical fiber, avoiding the wear of the optical fiber, and ensuring the quality of the optical fiber.

[0007] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0008] The present invention provides a fiber drawing device, including a frame plate. A heating furnace is arranged on the frame plate. A preform is arranged above the heating furnace on the frame plate, and the hanging point of the preform is located in the heating furnace. A winding disc for winding the optical fiber formed after heating the preform is arranged below the heating furnace on the frame plate. The frame plate is also provided with a midpoint orientation mechanism for keeping the optical fiber in the center position in the heating furnace. The midpoint orientation mechanism is located between the heating furnace and the winding disc. The midpoint orientation mechanism is provided with an induction component for judging the inclination degree of the optical fiber. The induction component is arranged on the frame plate and is located at a position on the frame plate close to the winding disc. The midpoint orientation mechanism is also provided with a control component for regulating the position of the preform. The control component is located on the back side of the frame plate away from the heating furnace.

[0009] Preferably, the midpoint orientation mechanism is provided with a positioning wheel. The positioning wheel is located between the heating furnace and the winding disc. The frame plate is provided with a shaft connection seat for the positioning wheel to be rotatably connected. The shaft connection seat is connected to the control component. The axis direction of the positioning wheel is perpendicular to the hanging direction of the optical fiber. The surface of the positioning wheel is in contact with the optical fiber. When the optical fiber is in contact with the positioning wheel, the optical fiber is in a straight hanging state.

[0010] Preferably, a movable plate is movably arranged on the shelf plate. The moving direction of the movable plate is perpendicular to the drooping direction of the optical fiber. A plug rod extends towards the movable plate on the shaft connecting seat. The end of the plug rod passes through the movable plate and extends outwards. A socket for the plug rod to pass through is formed on the movable plate. A buffer spring for buffering the contact between the positioning wheel and the optical fiber is also sleeved on the plug rod. Two ends of the buffer spring are respectively fixedly connected with the shaft connecting seat and the movable plate.

[0011] Preferably, the induction component is provided with a sleeve, and the sleeve is sleeved on the optical fiber. A slider is arranged on the shelf plate at the position of the sleeve. The slider can horizontally move on the shelf plate. A slide rail for the slider to slide is arranged on the shelf plate. A fixing ring is arranged on the sleeve. A rotating shaft extends towards the slider on one side of the fixing ring. The rotating shaft is rotatably connected to the slider. A torque sensor for testing the torque of the rotating shaft is also arranged on the back side of the slider. The rotating shaft is connected with the detection end of the torque sensor. When the optical fiber gradually tilts under the winding of the winding disc, the sleeve is in a state of offset and deflection along with the optical fiber.

[0012] Preferably, a torsion spring for resetting the sleeve is sleeved on the rotating shaft of the fixing ring. Two ends of the torsion spring are respectively fixedly connected with the slider and the fixing ring. When the sleeve rotates, the torsion spring is in a twisted state.

[0013] Preferably, the inner diameter of the sleeve is larger than the diameter of the optical fiber. A soft rubber ring is arranged in the sleeve. The soft rubber ring adheres to the inner wall of the sleeve. The inner diameter of the soft rubber ring is equal to the diameter of the optical fiber.

[0014] Preferably, the control component is provided with a sliding plate. The sliding plate is slidably arranged on the shelf plate. The sliding plate is fixedly connected with the movable plate. The sliding plate and the movable plate are perpendicular to each other. A guide rail for the sliding plate to slide is arranged on the shelf plate. The guiding direction of the guide rail is parallel to the guiding direction of the slide rail. When the optical fiber tilts and causes the sleeve to shift, the sliding plate moves and causes the positioning wheel to reset the optical fiber.

[0015] Preferably, the control component is further provided with a lifting rod. The lifting rod is arranged on the shelf plate. The axis direction of the lifting rod is parallel to the axis direction of the preform. The lower end of the lifting rod is movably connected with the sliding plate. The lifting rod can vertically move on the shelf plate. A linear actuator for driving the lifting rod to move is arranged on the shelf plate. When the lifting rod moves downwards, the sliding plate is in a state of being pushed inwards by the lifting rod.

[0016] Preferably, the lifting rod and the sliding plate are movably connected by a hinge. One end of the hinge is pivotally connected to the sliding plate. The other end of the hinge is pivotally connected to the lower end of the lifting rod. The sliding plate has a convex portion for the end portion of the hinge to be pivotally connected. The lower end of the lifting rod has a pivot portion for the end portion of the hinge to be pivotally connected.

[0017] Preferably, a connecting block is fixedly connected between the lifting rod and the preform. When the lifting rod moves, the preform moves together with it.

[0018] The beneficial effects of this application compared with the prior art are as follows:

[0019] 1. By positioning the optical fiber through the midpoint orientation mechanism, the optical fiber is made to maintain a drooping state in the heating furnace. During the process of winding the optical fiber on the winding disc, first, the induction component detects the inclination amplitude of the optical fiber to determine the position to be adjusted, and then transmits the detected signal to the control component, causing the control component to drive the midpoint orientation mechanism according to the inclination amplitude of the optical fiber, so that the midpoint orientation mechanism can accurately position the optical fiber to the original drooping position, realizing the state of the optical fiber maintaining at the midpoint in the heating furnace, improving the production efficiency of the optical fiber, avoiding the abrasion of the optical fiber, and ensuring the quality of the optical fiber.

[0020] 2. By guiding the optical fiber through the positioning wheel, the optical fiber is kept at the midpoint position in the heating furnace all the time. During the process of winding up the optical fiber, the possibility of the optical fiber gradually tilting and contacting other equipment in the heating furnace is avoided, realizing the protection of the optical fiber, improving the production efficiency of the optical fiber, and ensuring the quality of the optical fiber.

[0021] 3. Through the setting of the buffer spring, the contact between the positioning wheel and the optical fiber is buffered, ensuring the integrity of the optical fiber, realizing both the positioning of the optical fiber position and the protection of the optical fiber quality, and improving the production effect of the optical fiber.

[0022] 4. By sleeving the sleeve on the optical fiber, the inclination of the optical fiber can drive the sleeve to tilt together. After the sleeve tilts, the torque sensor detects the torque of the rotating shaft, thereby judging the inclination amplitude of the optical fiber, realizing the accurate reset of the sleeve by the control component, avoiding the contact between the optical fiber and other equipment in the heating furnace, and ensuring the quality of the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the three-dimensional structure schematic diagram of the optical fiber drawing device Figure 1 ;

[0024] Figure 2 is the three-dimensional structure schematic diagram of the optical fiber drawing device Figure 2 ;

[0025] Figure 3 is the three-dimensional structure schematic diagram of the optical fiber drawing device Figure 1 is the left view of;

[0026] Figure 4 is Figure 3 the sectional view taken along line A-A of;

[0027] Figure 5 is Figure 3 the three-dimensional structure sectional view taken along line A-A of;

[0028] Figure 6 is a schematic three - dimensional structure of an optical fiber drawing device Figure 1 rear view;

[0029] Figure 7 is Figure 5 an enlarged schematic view at position B of

[0030] Figure 8 is Figure 2 an enlarged schematic view at position C of

[0031] Figure 9 is Figure 1 an enlarged schematic view at position D of

[0032] Figure 10 is Figure 2 an enlarged schematic view at position E of

[0033] The reference numerals in the figure are:

[0034] 1 - support plate; 2 - heating furnace; 3 - preform; 31 - optical fiber; 4 - winding disc; 5 - mid - point orientation mechanism; 51 - positioning wheel; 52 - shaft connection seat; 521 - insertion rod; 522 - buffer spring; 53 - movable plate; 6 - induction component; 61 - sleeve; 611 - fixing ring; 6111 - rotating shaft; 6112 - torsion spring; 612 - soft rubber ring; 62 - slider; 63 - slide rail; 64 - torque sensor; 7 - control component; 71 - sliding plate; 72 - guide rail; 73 - lifting rod; 731 - hinge; 74 - linear actuator; 75 - connecting block. Specific embodiments

[0035] To further understand the features, technical means, and the specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] See Figures 1 - 6 As shown, the optical fiber drawing device includes a support plate 1, a heating furnace 2 is arranged on the support plate 1, a preform 3 is arranged on the support plate 1 and above the heating furnace 2, the hanging point of the preform 3 is located in the heating furnace 2, a winding disc for winding the optical fiber 31 formed after heating the preform 3 is arranged below the heating furnace 2 on the support plate 1, a mid - point orientation mechanism 5 for keeping the optical fiber 31 in the central position in the heating furnace 2 is further arranged on the support plate 1, the mid - point orientation mechanism 5 is located between the heating furnace 2 and the winding disc, the mid - point orientation mechanism 5 is provided with an induction component 6 for judging the inclination of the optical fiber 31, the induction component 6 is arranged on the support plate 1, the induction component 6 is located at a position on the support plate 1 close to the winding disc, the mid - point orientation mechanism 5 is further provided with a control component 7 for regulating the position of the preform 3, and the control component 7 is located on the back side of the support plate 1 away from the heating furnace 2.

[0037] During the drawing process of the optical fiber 31, the preform 3 is hung vertically and coaxially in the heating furnace 2, and the sag point of the preform 3 is located therein. During the drawing process, since the optical fiber 31 gradually tilts relative to the preform 3 during the winding process by the winding disc, the optical fiber 31 touches other equipment in the heating furnace 2, causing wear of the optical fiber 31, thereby reducing the quality of the finished optical fiber 31. At this time, during the drawing process of the optical fiber 31, the midpoint orientation mechanism 5 keeps the optical fiber 31 in the heating furnace 2 in its original hanging position, keeps the optical fiber 31 coaxial with the heating furnace 2, and does not approach its edge. As the winding disc continuously winds the optical fiber 31, since the position of the winding disc remains unchanged, therefore, the optical fiber 31 connected between the winding disc and the preform 3 will gradually tilt. The midpoint orientation mechanism 5 always maintains the positioning of the optical fiber 31. When the midpoint orientation mechanism 5 performs fixed-point holding on the optical fiber 31, the inclination amplitude of the optical fiber 31 is detected by the induction component 6. During the continuous detection process, the detected data is transmitted to the control component 7, and the control component 7 controls the midpoint orientation mechanism 5, which not only maintains the vertical positioning of the optical fiber 31 but also avoids the situation where the optical fiber 31 is damaged due to excessive pressure. The cooperation of the induction component 6 and the control component 7 effectively controls the position of the optical fiber 31, avoiding the situation of excessive wear of the optical fiber 31 until the winding disc winds up the optical fiber 31, completing the production and collection of the optical fiber 31.

[0038] See Figure 4 and Figure 9 As shown, the midpoint orientation mechanism 5 is provided with a positioning wheel 51. The positioning wheel 51 is located between the heating furnace 2 and the winding disc. On the frame plate 1, there is a shaft connection seat 52 for the positioning wheel 51 to be rotatably connected. The shaft connection seat 52 is connected to the control component 7. The axis direction of the positioning wheel 51 is perpendicular to the sag direction of the optical fiber 31, and the surface of the positioning wheel 51 contacts the optical fiber 31. When the optical fiber 31 contacts the positioning wheel 51, the optical fiber 31 is in a straight sag state.

[0039] When the midpoint orientation mechanism 5 contacts the optical fiber 31, the optical fiber 31 contacts the positioning wheel 51 through the positioning wheel 51, and the optical fiber 31 is stuck in the notch of the positioning wheel 51. As the optical fiber 31 is wound by the winding disc in a sag state, the optical fiber 31 will drive the positioning wheel 51 to rotate when being wound. Since the positioning wheel 51 is rotatably connected to the shaft connection seat 52, therefore, the surface friction between the optical fiber 31 and the positioning wheel 51 is reduced, avoiding the situation of excessive wear of the optical fiber 31, resulting in poor quality of the optical fiber 31. The positioning wheel 51 is kept at the position directly below the heating furnace 2, and the optical fiber 31 in the heating furnace 2 is always kept in the central position, without tilting and without contacting the other equipment in the heating furnace 2.

[0040] See Figure 5 and Figure 9As shown, a movable plate 53 is movably provided on the shelf plate 1. The moving direction of the movable plate 53 is perpendicular to the drooping direction of the optical fiber 31. A plug rod 521 extends towards the movable plate 53 on the shaft connecting seat 52. The end of the plug rod 521 passes through the movable plate 53 and extends outwards. A socket for the plug rod 521 to pass through is provided on the movable plate 53. A buffer spring 522 for buffering the contact between the positioning wheel 51 and the optical fiber 31 is also sleeved on the plug rod 521. The two ends of the buffer spring 522 are fixedly connected to the shaft connecting seat 52 and the movable plate 53 respectively.

[0041] When the positioning wheel 51 contacts the optical fiber 31, due to the winding of the optical fiber 31 by the winding disc, the drooping optical fiber 31 will gradually tilt. Therefore, if the positioning wheel 51 is in a fixed state, it will cause a large pressure on the optical fiber 31 and cause wear of the optical fiber 31. However, through the setting of the buffer spring 522, the movable plate 53 and the shaft connecting seat 52 are connected together. The movable plate 53 is connected to the control component 7. As the optical fiber 31 tilts towards the positioning wheel 51, the control component 7 immediately controls the movable plate 53 to move towards the optical fiber 31, prompting the positioning wheel 51 to press against the optical fiber 31, resetting the optical fiber 31, and keeping the optical fiber 31 in the heating furnace 2 in the central position. When the positioning wheel 51 presses against the optical fiber 31, the buffer spring 522 plays a buffering effect, avoiding the situation that the positioning wheel 51 presses the optical fiber 31 too hard and causing damage to the optical fiber 31.

[0042] See Figure 4 、 Figure 7 and Figure 8 As shown, the induction component 6 is provided with a sleeve 61. The sleeve 61 is sleeved on the optical fiber 31. A slider 62 is provided at the position of the sleeve 61 on the shelf plate 1. The slider 62 can move horizontally on the shelf plate 1. A slide rail 63 for the slider 62 to slide is provided on the shelf plate 1. A fixing ring 611 is provided on the sleeve 61. A rotating shaft 6111 extends towards the slider 62 on the fixing ring 611. The rotating shaft 6111 is rotatably connected to the slider 62. A torque sensor 64 for testing the torque of the rotating shaft 6111 is also provided on the back side of the slider 62. The rotating shaft 6111 is connected to the detection end of the torque sensor 64. When the optical fiber 31 gradually tilts under the winding of the winding disc, the sleeve 61 is in a state of offset and deflection along with the optical fiber 31.

[0043] When the optical fiber 31 is being wound by the winding disc, the optical fiber 31 gradually tilts. Since the sleeve 61 is sleeved on the optical fiber 31, the tilt of the optical fiber 31 also drives the sleeve 61 to rotate accordingly. Since the tilt of the optical fiber 31 is in an overall tilt state rather than a torsion at a single point, after the sleeve 61 rotates on the slider 62, it also causes the slider 62 to move a certain distance on the slide rail 63. At this time, the torque sensor 64 detects the rotational force brought by the rotating shaft 6111, thereby transmitting the deflection signal of the sleeve 61 to the control component 7. The control component 7 moves the slider 62 back to the original position to keep the midpoint position of the optical fiber 31 in the heating furnace 2.

[0044] See Figure 7 As shown, a torsion spring 6112 for resetting the sleeve 61 is sleeved on the rotating shaft 6111 of the fixed ring 611. The two ends of the torsion spring 6112 are fixedly connected to the slider 62 and the fixed ring 611 respectively. When the sleeve 61 rotates, the torsion spring 6112 is in a twisted state.

[0045] When the sleeve 61 deflects along with the optical fiber 31, the torsion spring 6112 is in a twisted state. When the optical fiber 31 is moved back to its original position by the positioning wheel 51, the torsion spring 6112 gradually returns to its normal state, and the sleeve 61 also returns to the vertical state along with the optical fiber 31, keeping the optical fiber 31 in the heating furnace 2 at the midpoint position.

[0046] See Figure 7 As shown, the inner diameter of the sleeve 61 is larger than the diameter of the optical fiber 31. A soft rubber ring 612 is provided in the sleeve 61. The soft rubber ring 612 adheres to the inner wall of the sleeve 61, and the inner diameter of the soft rubber ring 612 is equal to the diameter of the optical fiber 31.

[0047] When the optical fiber 31 moves in the sleeve 61, due to the soft rubber ring 612 provided in the sleeve 61, the movement of the optical fiber 31 in the sleeve 61 reduces the frictional force, avoiding the situation where the contact between the optical fiber 31 and the sleeve 61 causes serious wear of the optical fiber 31. While protecting the optical fiber 31, it also improves the production effect of the optical fiber 31.

[0048] See Figure 4 、 Figure 6 、 Figure 9 and Figure 10 As shown, the control component 7 is provided with a sliding plate 71. The sliding plate 71 is slidably arranged on the frame plate 1. The sliding plate 71 is fixedly connected to the movable plate 53. The sliding plate 71 and the movable plate 53 are perpendicular to each other. The frame plate 1 is provided with a guide rail 72 for the sliding plate 71 to slide. The guiding direction of the guide rail 72 is parallel to the guiding direction of the slide rail 63. When the optical fiber 31 tilts and causes the sleeve 61 to shift, the movement of the sliding plate 71 causes the positioning wheel 51 to reset the optical fiber 31.

[0049] When the control component 7 is started, the skateboard 71 will be pushed into the frame plate 1 in the guide rail 72, prompting the movable plate 53 connected thereto to move together, so that the positioning wheel 51 presses against the optical fiber 31 to move until the optical fiber 31 is moved to the normal sagging position, keeping the optical fiber 31 in the heating furnace 2 in a vertical state and avoiding contact with other equipment in the heating furnace 2.

[0050] See Figure 6 and Figure 10 As shown, the control component 7 is further provided with a lifting rod 73. The lifting rod 73 is arranged on the frame plate 1. The axial direction of the lifting rod 73 is parallel to the axial direction of the preform 3. The lower end of the lifting rod 73 is movably connected to the skateboard 71. The lifting rod 73 can move vertically on the frame plate 1. The frame plate 1 is provided with a linear actuator 74 for driving the lifting rod 73 to move. When the lifting rod 73 moves downward, the skateboard 71 is in a state of being pushed inward by the lifting rod 73.

[0051] When driving the skateboard 71 to move, the linear actuator 74 drives the lifting rod 73 to move. The lifting rod 73 moves vertically on the frame plate 1. When the lifting rod 73 moves downward, the lifting rod 73 will push the skateboard 71 to move towards the inside of the frame plate 1. On the contrary, the lifting rod 73 will push the skateboard 71 to move towards the outside of the frame plate 1. Through these two moving states, the pressing force of the positioning wheel 51 on the optical fiber 31 is controlled to avoid the situation that the positioning wheel 51 applies too much pressure to the optical fiber 31, resulting in damage to the optical fiber 31.

[0052] See Figure 10 As shown, the lifting rod 73 and the skateboard 71 are movably connected through a hinge 731. One end of the hinge 731 is axially connected to the skateboard 71, and the other end of the hinge 731 is axially connected to the lower end of the lifting rod 73. The skateboard 71 has a convex portion for the axial connection of the end portion of the hinge 731, and the lower end of the lifting rod 73 has an axial connection portion for the axial connection of the end portion of the hinge 731.

[0053] When the lifting rod 73 pushes the skateboard 71, since the lifting rod 73 and the skateboard 71 are movably connected through the hinge 731, therefore, the movement of the lifting rod 73 can drive the movement of the skateboard 71, and then drive the movement of the positioning wheel 51, ensuring that the optical fiber 31 remains in its original position.

[0054] See Figure 2 and Figure 4 As shown, a connecting block 75 is fixedly connected between the lifting rod 73 and the preform 3. When the lifting rod 73 moves, the preform 3 moves together with it.

[0055] When the lifting rod 73 drives the sliding plate 71 to move, thereby driving the positioning wheel 51 to press against the optical fiber 31, the lifting rod 73 is connected to the preform 3 through the connecting block 75, so as to promote the preform 3 to move together with the lifting rod 73. With the combustion of the preform 3 by the heating furnace 2, the sag point of the preform 3 is always maintained in the heating furnace 2. When the positioning wheel 51 presses against the optical fiber 31, the optical fiber 31 is also relaxed by a certain length as the preform 3 moves downward, so that the pressing of the positioning wheel 51 against the optical fiber 31 more effectively keeps the optical fiber 31 back to the midpoint position, avoiding the phenomenon that the positioning wheel 51 directly presses against the optical fiber 31 and causing the optical fiber 31 to break, and ensuring the quality of the optical fiber 31.

[0056] Through the positioning of the optical fiber 31 by the midpoint orientation mechanism 5 of the present invention, the optical fiber 31 is promoted to maintain a sagging state in the heating furnace 2. During the winding process of the optical fiber 31 on the winding disc, first, the inclination amplitude of the optical fiber 31 is detected by the induction component 6 to judge the position to be adjusted for the optical fiber 31, and then the detected signal is transmitted to the control component 7, causing the control component 7 to drive the midpoint orientation mechanism 5 according to the inclination amplitude of the optical fiber 31, so that the midpoint orientation mechanism 5 can accurately position the optical fiber 31 to the original sagging position, improving the manufacturing efficiency of the optical fiber 31, avoiding the abrasion of the optical fiber 31, and ensuring the quality of the optical fiber 31.

[0057] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. Optical fiber drawing device, comprising a frame plate (1), a heating furnace (2) is arranged on the frame plate (1), a preform rod (3) is arranged above the heating furnace (2) on the frame plate (1), the drooping point of the preform rod (3) is located in the heating furnace (2), and a winding disc for winding the optical fiber (31) formed after heating the preform rod (3) is arranged below the heating furnace (2) on the frame plate (1); It is characterized in that a midpoint orientation mechanism (5) for keeping the optical fiber (31) in the central position in the heating furnace (2) is further arranged on the frame plate (1), the midpoint orientation mechanism (5) is located between the heating furnace (2) and the winding disc, the midpoint orientation mechanism (5) is provided with an induction component (6) for judging the inclination of the optical fiber (31), the induction component (6) is arranged on the frame plate (1), the induction component (6) is located at a position on the frame plate (1) close to the winding disc, the midpoint orientation mechanism (5) is further provided with a control component (7) for regulating the position of the preform rod (3), and the control component (7) is located on the back side of the frame plate (1) away from the heating furnace (2); The induction component (6) is provided with a sleeve (61), the sleeve (61) is sleeved on the optical fiber (31), a slider (62) is arranged at the position of the sleeve (61) on the frame plate (1), the slider (62) can move horizontally on the frame plate (1), a slide rail (63) for the slider (62) to slide is arranged on the frame plate (1), a fixing ring (611) is arranged on the sleeve (61), a rotating shaft (6111) extends from one side of the fixing ring (611) towards the slider (62), the rotating shaft (6111) is rotatably connected to the slider (62), a torque sensor (64) for testing the torque of the rotating shaft (6111) is further arranged on the back side of the slider (62), the rotating shaft (6111) is connected to the detection end of the torque sensor (64), when the optical fiber (31) gradually inclines under the winding of the winding disc, the sleeve (61) is in a state of deviation and deflection along with the optical fiber (31); A torsion spring (6112) for resetting the sleeve (61) is sleeved on the rotating shaft (6111) of the fixing ring (611), and both ends of the torsion spring (6112) are fixedly connected to the slider (62) and the fixing ring (611) respectively. When the sleeve (61) rotates, the torsion spring (6112) is in a twisted state.

2. The optical fiber drawing device according to claim 1, It is characterized in that the midpoint orientation mechanism (5) is provided with a positioning wheel (51), the positioning wheel (51) is located between the heating furnace (2) and the winding disc, a shaft connecting seat (52) for the positioning wheel (51) to be rotatably connected is arranged on the frame plate (1), the shaft connecting seat (52) is connected to the control component (7), the axis direction of the positioning wheel (51) is perpendicular to the drooping direction of the optical fiber (31), the surface of the positioning wheel (51) is in contact with the optical fiber (31), and when the optical fiber (31) is in contact with the positioning wheel (51), the optical fiber (31) is in a straight and drooping state.

3. The optical fiber drawing device according to claim 2, It is characterized in that A movable plate (53) is movably arranged on the rack plate (1). The moving direction of the movable plate (53) is perpendicular to the downward direction of the optical fiber (31). A plug rod (521) extends towards the movable plate (53) on the shaft connecting seat (52). The end of the plug rod (521) passes through the movable plate (53) and extends outwards. A socket for the plug rod (521) to pass through is formed on the movable plate (53). A buffer spring (522) for buffering the contact between the positioning wheel (51) and the optical fiber (31) is also sleeved on the plug rod (521). The two ends of the buffer spring (522) are fixedly connected to the shaft connecting seat (52) and the movable plate (53) respectively.

4. The optical fiber drawing device according to claim 1, characterized in that, The inner diameter of the sleeve (61) is larger than the diameter of the optical fiber (31). A soft rubber ring (612) is arranged in the sleeve (61). The soft rubber ring (612) adheres to the inner wall of the sleeve (61). The inner diameter of the soft rubber ring (612) is equal to the diameter of the optical fiber (31).

5. The optical fiber drawing device according to claim 1, characterized in that, The control component (7) is provided with a sliding plate (71). The sliding plate (71) is slidably arranged on the rack plate (1). The sliding plate (71) is fixedly connected to the movable plate (53). The sliding plate (71) and the movable plate (53) are perpendicular to each other. A guide rail (72) for the sliding plate (71) to slide is arranged on the rack plate (1). The guiding direction of the guide rail (72) is parallel to the guiding direction of the sliding rail (63). When the optical fiber (31) is tilted and causes the sleeve (61) to shift, the sliding plate (71) moves so that the positioning wheel (51) returns the optical fiber (31) to its original state.

6. The optical fiber drawing device according to claim 5, characterized in that, The control component (7) is further provided with a lifting rod (73). The lifting rod (73) is arranged on the rack plate (1). The axial direction of the lifting rod (73) is parallel to the axial direction of the preform (3). The lower end of the lifting rod (73) is movably connected to the sliding plate (71). The lifting rod (73) can move vertically on the rack plate (1). A linear driver (74) for driving the lifting rod (73) to move is arranged on the rack plate (1). When the lifting rod (73) moves downward, the sliding plate (71) is in a state of being pushed inward by the lifting rod (73).

7. The optical fiber drawing device according to claim 6, characterized in that, The lifting rod (73) and the sliding plate (71) are movably connected through a hinge (731). One end of the hinge (731) is pivotally connected to the sliding plate (71). The other end of the hinge (731) is pivotally connected to the lower end of the lifting rod (73). The sliding plate (71) has a convex portion for the end of the hinge (731) to be pivotally connected. The lower end of the lifting rod (73) has a pivot portion for the end of the hinge (731) to be pivotally connected.

8. The optical fiber drawing device according to claim 6, characterized in that, A connecting block (75) is fixedly connected between the lifting rod (73) and the preform (3). When the lifting rod (73) moves, the preform (3) moves together with it.

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