Wire drawing system capable of adjusting core-cladding ratio structure of prefabricated rod in real time

Abstract

The invention discloses a wire drawing system capable of adjusting a preform core cladding ratio structure in real time, and particularly relates to the field of optical fiber wire drawing systems. A clamp mechanism used for fixing a cladding tube and a core rod, a heating furnace used for heating, a diameter measuring instrument used for measuring the diameter of an optical fiber and a guide frame used for guiding are sequentially arranged in the machine frame from top to bottom, and a take-up frame used for taking up the optical fiber is arranged on the outer side of the machine frame and located opposite to the guide frame. And the core rod is sleeved on the outer surface of the cladding tube. According to the invention, the core rod and the cladding tube are separated, and then the feeding speed of the core rod and the feeding speed of the cladding tube are respectively controlled, so that the ratio of the cladding to the core rod can be changed by changing the speeds of the core rod and the cladding tube to enable the core rod and the cladding tube to have a speed difference, and the core-cladding ratio of the optical fiber can be adjusted in real time by adjusting the speed in real time; and the shaping difficulty of the core rod and the cladding sleeve is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber drawing systems, and more specifically, to a drawing system for adjusting the core-to-package ratio structure of a preform rod in real time. Background Art

[0002] Optical fiber drawing is done by heating the preform in a drawing furnace. The preform is heated to an extremely high temperature and gradually softens. Tension is applied to the softened part of the preform to reduce diameter dripping. The dripping and cooled optical fiber is collected onto the take-up drum through the main traction wheel on the main traction device and the optical fiber take-up machine at the end.

[0003] Schott AG introduces the preform into the heating sleeve of the fiber furnace through a follower device. By designing the structure or layout of the heating sleeve, it ensures that the glass fibers are pulled out without touching or crossing each other, so that the glass fibers have a predetermined constant diameter.

[0004] Fujikura Ltd. temporarily heats silica glass containing rare earth element compounds to a temperature above the glass transition point and in a single phase, then accelerates the cooling rate and cools it to a specified temperature, thereby suppressing the crystallization and phase separation of the rare earth element compounds and thus suppressing the loss of light during propagation.

[0005] Corning Inc. has reduced the open annular volume in the drawing furnace and the size of the internal open cavity to enable the drawing system to have a more stable and uniform gas flow, thereby reducing the temperature fluctuations caused by the gas flow and controlling the uniformity of the optical fiber diameter.

[0006] Corning INC also achieves slow annealing of optical fiber by setting the opening size of the air inlet and outlet and controlling the cooling rate, which slows down the cooling speed of the optical fiber and improves the density uniformity in the optical fiber, thereby reducing the attenuation during use.

[0007] In addition, Corning INC has also achieved multi-stage flame heating of optical fibers by setting multiple burners and corresponding heating temperatures, thereby increasing the rate of the optical fiber drawing process while ensuring the quality of the optical fiber.

[0008] The above traditional optical fiber drawing process is to place the fixed size of the preform on the rod feeding mechanism on the top of the drawing furnace for heating and drawing. The preform passes through the main traction device in turn through the drawing furnace, annealing device, cooling device, and finally forms optical fiber. This results in the core-to-clad ratio of the optical fiber being a fixed value and depending on the size of the preform. If you want to obtain optical fibers with different core-to-clad ratios, you need to modify the cladding sleeve of the preform, which is a cumbersome operation. Summary of the invention

[0009] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an optical fiber drawing system for real-time adjustment of the core-to-cladding ratio structure of a preform rod, by separating the core rod from the cladding tube, and then controlling the feeding speed of the core rod and the feeding speed of the cladding tube respectively. By changing the speeds of the two so that there is a speed difference between them, the ratio of the cladding and the core rod can be changed. In this way, through real-time speed regulation, the core-to-cladding ratio of the optical fiber can be adjusted in real time, which greatly reduces the difficulty of shaping the core rod and the cladding sleeve.

[0010] To achieve the above-mentioned object, in a first aspect, the present invention provides a glass fiber preparation device, including a wire drawing system for adjusting the core-to-package ratio structure of a preform rod in real time, including a frame, wherein a clamp mechanism, a heating furnace, a diameter gauge, a guide frame, and a side frame located outside the frame are sequentially arranged inside the frame from top to bottom; The clamp mechanism is used to fix the cladding tube and the core rod, and the core rod is sleeved on the outer surface of the cladding tube; The heating furnace is used to heat the cladding tube and the core rod to draw out the glass filaments; The diameter gauge is used to measure the diameter of the optical fiber with an accuracy of one thousandth; The guide frame is used for guiding the optical fiber; The side frame is located opposite to the guide frame and is used for winding up the optical fiber; The frame is provided with a feeding mechanism, and the feeding mechanism is divided into two groups. The two groups of feeding mechanisms are respectively arranged on both sides of the inner wall of the frame. The clamp mechanism includes a first clamp and a second clamp, and the second clamp is located below the first clamp. The first clamp and the second clamp are respectively fixed on the feeding mechanisms on both sides, and the first clamp and the second clamp are respectively driven to move up and down by the feeding mechanism.

[0011] Furthermore, the feeding mechanism includes a mounting frame and a first screw rod longitudinally arranged inside the mounting frame, a first motor is fixedly installed on the top end of the mounting frame, one end of the output shaft of the first motor is fixedly connected to the top end of the first screw rod, and the first screw rod is rotatably connected to the mounting frame through the first motor, a slide rod is sleeved on the outer surface of the first screw rod, and the first screw rod is threadedly connected to the slide rod.

[0012] Furthermore, a first vertical slide groove is provided on the outer surfaces of both sides of the frame, and one end of the slides on both sides is slidably connected to the mounting frame through the first slide groove, the first clamp is fixedly installed on the other end of the slide on one side, and the second clamp is fixedly installed on the other end of the slide on the other side, and the slide is fixed in the slide groove and moves up and down in the vertical direction with the rotation of the screw.

[0013] Furthermore, the second clamp is sleeved on the outer surface of the top end of the core rod, and a clamping mechanism is arranged inside the second clamp. The clamping mechanism includes a push rod inserted around the second clamp, and one end of the push rod is located on the inner side of the second clamp and fixedly installed with a clamp plate, so that the outer surface of the core rod is fixed by the clamp plates around it.

[0014] Furthermore, a stopper is fixedly installed on the other end of the second clamp, and an electromagnet is fixedly installed around the inner wall of the second clamp. The electromagnet is sleeved on the outer surface of the push rod, and a return spring is sleeved on the outer surface of the push rod between the stopper and the electromagnet.

[0015] Furthermore, the clamping mechanism disposed inside the first clamp has the same structure as the clamping mechanism inside the second clamp, and the top end of the core rod is fixed by the clamping mechanism inside the first clamp.

[0016] Furthermore, the heating furnace is located below the first fixture, and has a box body, a furnace core tube, a heating element, and a heat insulating member as main structures, which form a heating space to melt the optical fiber mother material.

[0017] Furthermore, a refrigerant flow path for circulating refrigerant is formed in the outer wall of the box. The box is cooled by circulating refrigerant in the refrigerant flow path, thereby suppressing heat damage to the box. The box has a through hole penetrating in the vertical direction at the center, and the furnace core tube is inserted into the through hole.

[0018] Furthermore, the furnace core tube has a hollow portion formed on the box body and communicating with the through hole, and a heating element is provided in the hollow portion so as to heat the furnace core tube from the outer peripheral surface side of the furnace core tube.

[0019] Furthermore, the heating element is composed of a resistance heating element based on resistance heating when current flows and is arranged in a ring-shaped manner in the heating furnace so that the heating space is heated evenly, and the heating temperature can reach 1000°C~1500°C.

[0020] Furthermore, the height of the heating element is preferably 30-40 mm. In addition, the heating element can adopt a segmented structure, and the temperature of each heating element can be controlled by an independent controller through the segmented structure to achieve the process requirements of increasing the Las rate and slow cooling.

[0021] Furthermore, in order to effectively utilize the heat generated by the heating element, a heat insulating member is provided around the heating element and the furnace core tube.

[0022] Furthermore, a heat sink is provided at the lower side of the heating element that heats the heating furnace, and transfers the heat from the inner side of the heating furnace to the outer side of the heating furnace. The heat conductivity of the heat sink is higher than that of the heat insulating member. By providing such a heat sink, it is easier to discharge heat to the outside of the heating furnace from the lower side than from the upper side.

[0023] Furthermore, a bare optical fiber diameter measuring instrument with an accuracy of one thousandth is provided at the exit of the drawing furnace.

[0024] Furthermore, the wire take-up frame includes a wire take-up shaft arranged on both side frames and between the side frames on both sides.

[0025] Furthermore, a second motor is fixedly mounted on the outer surface of the side frame at one side, and one end of the output shaft of the second motor is fixedly connected to the wire take-up shaft, and the wire take-up shaft is rotatably connected via the second motor.

[0026] Furthermore, a slider is fixedly installed on one end of the side frame on the other side, a second slide groove matching the slider is opened on the outer surface of the frame, and the other side is slidably connected to the frame through the slider.

[0027] Furthermore, a second screw is arranged inside the second slide groove, a slider is sleeved on the outer surface of the second screw, and the slider is threadedly connected to the second screw, one end of the second screw is fixedly connected to a turntable, and the turntable is rotatably installed at the rear end of the frame.

[0028] A wire drawing system for adjusting the core-to-package ratio structure of a preform rod in real time is implemented, and the method comprises the following steps: Step 1: Fixing the core rod and the cladding tube by a first clamp and a second clamp respectively; Step 2: By setting the power of the motor, the speed at which the cladding tube and the core rod are conveyed downward is adjusted to control the core-to-clad ratio of the optical fiber monofilament; Step 3: The core rod and cladding tube will enter the heating furnace at a set speed for heating. After melting, the optical fiber will be pulled out under the action of gravity. Step 4: The optical fiber passes through the caliper to measure the diameter; Step 5: The optical fiber is guided by a guide frame; Step 6: The optical fiber is wound up through a take-up frame.

[0029] Technical effects and advantages of the present invention: The present invention separates the core rod from the cladding tube and then controls the feeding speed of the core rod and the feeding speed of the cladding tube respectively. By changing the speeds of the two so that there is a speed difference between them, the ratio of the cladding to the core rod can be changed. In this way, the core-to-cladding ratio of the optical fiber can be adjusted in real time through real-time speed regulation, which greatly reduces the difficulty of shaping the core rod and the cladding tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0031] Figure 2 It is a front view of the whole of the present invention.

[0032] Figure 3 It is a schematic diagram of the structure of the conveying mechanism of the present invention.

[0033] Figure 4 It is a schematic diagram of the second clamp structure of the present invention.

[0034] Figure 5 It is an exploded view of the clamping plate installation structure of the present invention.

[0035] Figure 6 It is a structural schematic diagram of the take-up frame of the present invention.

[0036] Figure 7 This is a diagram showing the internal structure of the heating furnace in the wire drawing state of the present invention.

[0037] Figure 8 This is a top view of the wire drawing process in which the core rod conveying rate is greater than the cladding tube conveying rate.

[0038] Fig. 9 This is a top view of the wire drawing state in which the core rod conveying rate is equal to the cladding tube conveying rate of the present invention.

[0039] Fig.10 This is a top view of the wire drawing process in which the core rod conveying rate is lower than the cladding tube conveying rate.

[0040] Fig.11 Based on the transmission principle of optical waveguide in optical fiber, Figure 8 The modeling result diagram of the optical fiber transmission shown in the figure. (X, Y represent the optical fiber diameter, and E represents the electromagnetic field strength).

[0041] Fig.12 Based on the transmission principle of optical waveguide in optical fiber, Fig.10 The modeling result diagram of the optical fiber transmission shown in the figure. (X, Y represent the optical fiber diameter, and E represents the electromagnetic field strength).

[0042] The accompanying drawings are marked as follows: 1. frame; 11. first slide groove; 2. mounting frame; 21. slide frame; 22. first screw; 23. first motor; 3. first clamp; 4. second clamp; 41. push rod; 42. clamp; 43. block; 44. return spring; 45. electromagnet; 5. heating furnace; 6. diameter gauge; 7. guide frame; 8. take-up frame; 81. side frame; 82. take-up shaft; 83. second motor; 84. slider; 85. second screw; 86. turntable; 9. cladding tube; 91. core rod. Implementation

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0044] according to Figure 1-10 A wire drawing system for adjusting the core-to-clad ratio structure of a preform rod in real time is shown, comprising a frame 1, wherein a clamp mechanism for fixing a cladding tube 9 and a core rod 91, a heating furnace 5 for heating, a diameter gauge 6 for measuring the diameter of an optical fiber, and a guide frame 7 for guiding are sequentially arranged inside the frame 1 from top to bottom, and a take-up frame 8 for winding up the optical fiber is arranged on the outside of the frame 1 opposite to the guide frame 7, and the core rod 91 is sleeved on the outer surface of the cladding tube 9; The frame 1 is provided with a feeding mechanism, and the feeding mechanism is divided into two groups. The two groups of feeding mechanisms are respectively arranged on both sides of the inner wall of the frame 1. The clamp mechanism includes a first clamp 3 and a second clamp 4, and the second clamp 4 is located below the first clamp 3. The first clamp 3 and the second clamp 4 are respectively fixed on the feeding mechanisms on both sides, and the first clamp 3 and the second clamp 4 are respectively driven to move up and down by the feeding mechanism.

[0045] Furthermore, the feeding mechanism includes a mounting frame 2 and a first screw 22 longitudinally arranged inside the mounting frame 2, a first motor 23 is fixedly installed on the top of the mounting frame 2, one end of the output shaft of the first motor 23 is fixedly connected to the top of the first screw 22, and the first screw 22 is rotatably connected to the mounting frame 2 through the first motor 23, a slide 21 is sleeved on the outer surface of the first screw 22, and the first screw 22 is threadedly connected to the slide 21, the first motor 23 on both sides of the frame 1 is started, and the first screw 22 is driven to rotate by the first motor 23, and during the rotation, the slides 21 on both sides will slide downward along the first slide groove 11.

[0046] Furthermore, the descending speed of the feeding mechanism affects the size parameters of the optical fiber. For example, when the descending speed V1 of the feeding mechanism of the core rod 91 is 500 m / min, the core diameter of the drawn optical fiber is about 70 μm. When the descending speed V1 of the feeding mechanism of the core rod 91 is 700 m / min, the core diameter of the drawn optical fiber is about 30 μm.

[0047] Furthermore, vertical first slide grooves 11 are provided on the outer surfaces of both sides of the frame 1, and one end of the slides 21 on both sides are slidably connected to the mounting frame 2 through the first slide grooves 11. The first clamp 3 is fixedly installed on the other end of the slide 21 on one side, and the second clamp 4 is fixedly installed on the other end of the slide 21 on the other side. During the sliding process, the slide 21 drives the core rod 91 and the cladding tube 9 to move downward respectively.

[0048] Furthermore, the second clamp 4 is sleeved on the outer surface of the top end of the core rod 91, and a clamping mechanism is arranged inside the second clamp 4. The clamping mechanism includes a push rod 41 inserted around the second clamp 4, and one end of the push rod 41 is located on the inner side of the second clamp 4 and is fixedly installed with a clamping plate 42. The outer surface of the core rod 91 is fixed by the clamping plates 42 around. During the fixing process, the electromagnet 45 needs to be started, and the stop block 43 at one end of the push rod 41 is attracted by the magnetic force of the electromagnet 45 to push the push rod 41 inward, and the core rod 91 is fixed to the top end of the cladding tube 9 through the clamping plate 42 at one end.

[0049] Furthermore, a stopper 43 is fixedly installed on the other end of the second clamp 4 on the outside of the second clamp 4, and an electromagnet 45 is fixedly installed around the inner wall of the second clamp 4, and the electromagnet 45 is sleeved on the outer surface of the push rod 41, and a reset spring 44 is sleeved on the outer surface of the push rod 41 between the stopper 43 and the electromagnet 45. The push rod 41 will squeeze the reset spring 44 during the process of pushing inward. After the feeding is completed, the electromagnet 45 is closed, and the reset spring 44 will push the stopper 43 outward, pulling the push rod 41 to reset.

[0050] Furthermore, the clamping mechanism disposed inside the first clamp 3 has the same structure as the clamping mechanism inside the second clamp 4 , and the top end of the core rod 91 is fixed by the clamping mechanism inside the first clamp 3 .

[0051] Furthermore, the heating furnace 5 is located below the first fixture 3 and has a box body, a furnace core tube, a heating element, a heat insulating element and a heat dissipating element as main structures, which form a heating space to melt the optical fiber mother material.

[0052] Furthermore, a refrigerant flow path for circulating refrigerant is formed in the outer wall of the box. The box is cooled by circulating refrigerant in the refrigerant flow path, thereby suppressing heat damage to the box. The box has a through hole penetrating in the vertical direction at the center, and the furnace core tube is inserted into the through hole.

[0053] Furthermore, the furnace core tube has a hollow portion formed on the box body and communicating with the through hole, and a heating element is provided in the hollow portion so as to heat the furnace core tube from the outer peripheral surface side of the furnace core tube.

[0054] Furthermore, the heating element is composed of a resistance heating element based on resistance heating when current flows, and is arranged in a ring-shaped manner in the heating furnace 5 so that the heating space is heated evenly, and the heating temperature can reach 1000°C~1500°C.

[0055] Furthermore, the height of the heating element is preferably 30-40 mm.

[0056] Furthermore, in order to effectively utilize the heat generated by the heating element, a heat insulating member is provided around the heating element and the furnace core tube.

[0057] Furthermore, a heat sink is provided at the lower side of the heating element that heats the heating furnace, and transfers the heat from the inner side of the heating furnace to the outer side of the heating furnace. The heat conductivity of the heat sink is higher than that of the heat insulating member. By providing such a heat sink, it is easier to discharge heat to the outside of the heating furnace from the lower side than from the upper side.

[0058] Furthermore, with regard to the temperature distribution in the heating furnace, the temperature is raised from the upstream side to the downstream side to the maximum temperature and then lowered, and there is a change point where the temperature drops sharply on the downstream side more than the portion where the maximum temperature is reached. The maximum temperature is the temperature at which the light matrix reaches a temperature above the glass transition point.

[0059] Furthermore, a bare optical fiber diameter measuring instrument 6 with an accuracy of one thousandth is provided at the outlet of the heating furnace 5 .

[0060] Furthermore, the side frame 8 includes a take-up shaft 82 arranged between the side frames 81 on both sides, and a second motor 83 is fixedly installed on the outer surface of the side frame 81 on one side, and one end of the output shaft of the second motor 83 is fixedly connected to the take-up shaft 82, and the take-up shaft 82 is rotatably connected to the side frame 81 through the second motor 83. During the winding process, the second motor 83 on one side of the side frame 81 will start, driving the take-up shaft 82 to rotate, and winding the optical fiber onto the surface of the take-up shaft 82, and the linear speed of the take-up shaft rotation is consistent with the optical fiber drawing speed.

[0061] Furthermore, a slider 84 is fixedly installed at one end of the side frame 81 on the other side, and a second slide groove matching the slider 84 is opened on the outer surface of the frame 1. The side frame 81 on the other side is slidably connected to the frame 1 through the slider 84, and a second screw 85 is arranged inside the second slide groove. The slider 84 is sleeved on the outer surface of the second screw 85, and the slider 84 is threadedly connected to the second screw 85. A turntable 86 is fixedly connected to one end of the second screw 85, and the turntable 86 is rotatably installed at the rear end of the frame 1. After collection is completed, the turntable 86 can be rotated to drive the second screw 85 to rotate, which will drive the side frame 81 on the other side to slide along the second slide groove, so that the side frame 81 on the other side is detached from one end of the take-up shaft 82. After pulling a suitable distance, it is convenient to remove the wound optical fiber.

[0062] The specific implementation method is as follows: when in use, the core rod 91 and the cladding tube 9 are fixed by the first clamp 3 and the second clamp 4 respectively. During the fixing process, the electromagnet 45 needs to be started. The stopper 43 at one end of the push rod 41 is attracted by the magnetic force of the electromagnet 45, pushing the push rod 41 inward, and fixing the core rod 91 and the top of the cladding tube 9 through the clamping plate 42 at one end. During the inward pushing process of the push rod 41, the reset spring 44 will be squeezed. After the feeding is completed, the electromagnet 45 is turned off, the reset spring 44 will push the stopper 43 outward, and pull the push rod 41 to reset. Then the first motor 23 on both sides of the frame 1 is started, and the first screw 22 is driven to rotate by the first motor 23. The first screw 22 is threadedly connected to the slide 21. During the rotation process, the slides 21 on both sides will slide downward along the first slide groove 11, respectively driving the core rod 91 and the cladding tube 9 to move downward and enter the heating furnace 5 for heating treatment. During the transportation process, The power of the first motors 23 on both sides is adjusted to control the downward conveying rate of the cladding tube 9 and the core rod 91, so as to adjust the ratio of the core rod 91 to the cladding. The core rod 91 and the cladding tube 9 will enter the heating furnace 5 for heating. After being heated to a certain temperature, the wire drawing process will be carried out. The drawn optical fiber will first pass through the diameter gauge 6 for diameter measurement, and then be guided by the guide frame 7, and finally be wound up by the take-up frame 8. During the winding process, the second motor 83 on one side of the side frame 81 will be started to drive the take-up shaft 82 to rotate, and the optical fiber will be wound onto the surface of the take-up shaft 82. After the collection is completed, the turntable 86 can be rotated to drive the second screw 85 to rotate. The slider 84 is threadedly connected to the second screw 85, which will drive the side frame 81 on the other side to slide along the second slide groove, so that the side frame 81 on the other side is detached from one end of the take-up shaft 82. After pulling away from a suitable distance, it is convenient to remove the wound optical fiber. After removal, the side frame 81 on the other side is reset through the turntable 86.

[0063] Working principle of the present invention: Refer to the instruction manual Figure 1-10 When in use, the core rod 91 and the cladding tube 9 are fixed by the first clamp 3 and the second clamp 4 respectively, and then the first motor 23 on both sides of the frame 1 is started, and the first screw 22 is driven to rotate by the first motor 23. During the rotation, the slides 21 on both sides will slide downward along the first slide groove 11, respectively driving the core rod 91 and the cladding tube 9 to move downward and enter the heating furnace 5 for heating treatment. During the transportation process, the power of the first motors 23 on both sides can be adjusted to control the downward transportation rate of the cladding tube 9 and the core rod 91, thereby adjusting the ratio of the core rod 91 to the cladding. The core rod 91 and the cladding tube 9 will enter the heating furnace 5 for heating, and after being heated to a certain temperature, the wire drawing process is performed. When the transportation speed of the cladding tube 9 is less than the transportation speed of the core rod 91, the effect of the drawn optical fiber is as follows. Figure 8The outer diameter of the cladding is smaller than the inner core. When the conveying speed of the cladding tube 9 is equal to the conveying speed of the core rod 91, the effect of the pulled optical fiber is as follows: Fig. 9 , the outer diameter of the cladding is equal to the inner core. When the conveying speed of the cladding tube 9 is greater than the conveying speed of the core rod 91, the effect of the pulled optical fiber is as follows: Fig.10 The outer diameter of the cladding is larger than the inner core. The pulled-out optical fiber will first pass through a diameter gauge 6 to measure the diameter, then be guided by a guide frame 7, and finally be reeled in by a take-up frame 8.

[0064] Hereinafter, the first embodiment and the second embodiment of the optical fiber manufacturing method of the present invention will be described together.

[0065] Embodiment 1: Embodiment 1 is Figure 1 , Figure 2 The construction shown applies to Figure 8 The optical fiber manufacturing apparatus shown is used to actually manufacture an embodiment of an optical fiber line.

[0066] The core rod 91 and the cladding tube 9 are fixed by the first clamp 3 and the second clamp 4 respectively. During the fixing process, the electromagnet 45 needs to be started. The stopper 43 at one end of the push rod 41 is attracted by the magnetic force of the electromagnet 45, pushing the push rod 41 inward, and fixing the core rod 91 and the top of the cladding tube 9 through the clamping plate 42 at one end. During the inward pushing process of the push rod 41, the reset spring 44 is squeezed. After the feeding is completed, the electromagnet 45 is turned off, the reset spring 44 pushes the stopper 43 outward, and pulls the push rod 41 to reset. Then the first motor 23 on both sides of the frame 1 is started, and the first screw 22 is driven to rotate by the first motor 23. The first screw 22 is threadedly connected to the slide 21. During the rotation, the slides 21 on both sides will slide downward along the first slide groove 11, respectively driving the core rod 91 and the cladding tube 9 to move downward. The setting of the first motors 23 on both sides makes the core rod 91 feeding mechanism The descending speed V1=500m / min is greater than the descending speed V2=300m / min of the feeding mechanism of the cladding tube 9, and enters the heating furnace 5 for heating treatment. After being heated to a certain temperature, it is subjected to wire drawing treatment. The drawn optical fiber will first pass through the diameter gauge 6 for diameter measurement, and then be guided by the guide frame 7, and finally be wound up by the take-up frame 8. During the winding process, the second motor 83 on one side of the side frame 81 will be started, driving the take-up shaft 82 to rotate, and the optical fiber line will be wound onto the surface of the take-up shaft 82. After collection is completed, the turntable 86 can be rotated to drive the second screw 85 to rotate. The slider 84 is threadedly connected to the second screw 85, which will drive the side frame 81 on the other side to slide along the second slide groove, so that the side frame 81 on the other side is detached from one end of the take-up shaft 82. After pulling away from a suitable distance, it is convenient to remove the wound optical fiber. After removal, the side frame 81 on the other side is reset through the turntable 86. Thus, an optical fiber with a core diameter of 70 μm was drawn, and the optical fiber was used for transmission modeling. Fig.11 The optical waveguide is shown in Figure 8 Transmission modeling results of the optical fiber filament shown, where X and Y represent the optical fiber diameters and E represents the electromagnetic field intensity.

[0067] Embodiment 2: Example 2 is to use Figure 1 , Figure 2 The structure shown controls the cladding drop speed V2 to be greater than the core drop speed V1, thereby making the cladding diameter larger, such as Fig.10 as shown in .

[0068] That is, in Example 1, the core mother material descent speed and the cladding mother material descent speed are adjusted as follows: first, the feeding speed of the left feeding mechanism is adjusted to V1=500m / min, and then the feeding speed of the right feeding mechanism is adjusted to V2=660m / min. Other conditions are the same as in Example 1. contrast Figure 8 and Fig.10It can be found that when v1 < v2, the diameter of the cladding wall is thicker than that of the core diameter, and when v1 > v2, the diameter of the cladding is thinner than that of the core diameter.

[0069] Comparison Fig.11 and Fig.12 From the modeling result diagrams of and, it can be found that when v1 < v2, the cladding wall thickens, which can effectively suppress the transmission of short-wavelength optical waveguides (taking 400 nm as an example). When v1 > v2, the cladding wall thins, and the transmission efficiency of short-wavelength optical waveguides increases. Therefore, adjusting the core-cladding ratio in real time can control the transmission efficiency of optical waveguides with different wavelengths during the fiber drawing process.

[0070] The preferred embodiments and examples of the present invention have been described above. However, the present invention is of course not limited to the above embodiments and examples. Additions, omissions, substitutions, and other changes can be made without departing from the gist of the present invention.

Claims

1. A wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod, comprising a frame (1), characterized in that: The inside of the frame (1) is provided with a clamp mechanism for fixing the cladding tube (9) and the core rod (91), a heating furnace (5) for heating, a diameter gauge (6) for measuring the diameter of the optical fiber, and a guide frame (7) for guiding in order from top to bottom. A take-up frame (8) for winding up the optical fiber is provided on the outside of the frame (1) opposite to the guide frame (7). The core rod (91) is sleeved on the outer surface of the cladding tube (9). The frame (1) is provided with a feeding mechanism, and the feeding mechanism is divided into two groups. The two groups of feeding mechanisms are respectively arranged on both sides of the inner wall of the frame (1). The clamp mechanism comprises a first clamp (3) and a second clamp (4), and the second clamp (4) is located below the first clamp (3). The first clamp (3) and the second clamp (4) are respectively fixed on the feeding mechanisms on both sides, and the first clamp (3) and the second clamp (4) are respectively driven to move up and down by the feeding mechanisms.

2. A wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 1, characterized in that: The feeding mechanism comprises a mounting frame (2) and a first screw (22) longitudinally arranged inside the mounting frame (2); a first motor (23) is fixedly mounted on the top end of the mounting frame (2); one end of an output shaft of the first motor (23) is fixedly connected to the top end of the first screw (22); the first screw (22) is rotatably connected to the mounting frame (2) via the first motor (23); a slide frame (21) is sleeved on the outer surface of the first screw (22); and the first screw (22) is threadedly connected to the slide frame (21).

3. A wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 2, characterized in that: The outer surfaces of both sides of the frame (1) are provided with vertical first sliding grooves (11), one end of the sliding frames (21) on both sides are slidably connected to the mounting frame (2) through the first sliding grooves (11), the first clamp (3) is fixedly mounted on the other end of the sliding frame (21) on one side, and the second clamp (4) is fixedly mounted on the other end of the sliding frame (21) on the other side.

4. A wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 3, characterized in that: The second clamp (4) is sleeved on the outer surface of the top end of the core rod (91), and a clamping mechanism is arranged inside the second clamp (4), wherein the clamping mechanism comprises a push rod (41) inserted around the second clamp (4), one end of the push rod (41) is located on the inner side of the second clamp (4) and a clamping plate (42) is fixedly installed thereon, and the outer surface of the core rod (91) is fixed by the clamping plates (42) around the outer surface of the core rod (91).

5. The wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 4, characterized in that: The other end of the second clamp (4) is located outside the second clamp (4) and is fixedly mounted with a stopper (43); an electromagnet (45) is fixedly mounted around the inner wall of the second clamp (4), and the electromagnet (45) is sleeved on the outer surface of the push rod (41); and a return spring (44) is sleeved on the outer surface of the push rod (41) between the stopper (43) and the electromagnet (45).

6. The wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 4, characterized in that: The clamping mechanism arranged inside the first clamp (3) has the same structure as the clamping mechanism inside the second clamp (4), and the top end of the core rod (91) is fixed by the clamping mechanism inside the first clamp (3).

7. The wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 1, characterized in that: The wire take-up frame (8) comprises side frames (81) arranged on both sides and a wire take-up shaft (82) arranged between the side frames (81) on both sides.

8. The wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 7, characterized in that: A second motor (83) is fixedly mounted on the outer surface of the side frame (81) at one side, and one end of the output shaft of the second motor (83) is fixedly connected to the wire take-up shaft (82), and the wire take-up shaft (82) is rotationally connected to the side frame (81) via the second motor (83).

9. The wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 8, characterized in that: A slider (84) is fixedly mounted on one end of the side frame (81) on the other side, a second slide groove matching the slider (84) is provided on the outer surface of the frame (1), and the side frame (81) on the other side is slidably connected to the frame (1) via the slider (84).

10. The wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod according to claim 9, characterized in that: A second screw rod (85) is arranged inside the second slide groove, a sliding block (84) is sleeved on the outer surface of the second screw rod (85), and the sliding block (84) is threadedly connected to the second screw rod (85), one end of the second screw rod (85) is fixedly connected to a rotating disk (86), and the rotating disk (86) is rotatably mounted on the rear end of the frame (1).

11. A method for adjusting the core-to-cover ratio of an optical fiber in real time, characterized in that: According to any one of claims 1 to 10, a wire drawing system for real-time adjustment of the core-to-package ratio structure of a preform rod is implemented, and the method comprises the following steps: Step 1: Fixing the core rod (91) and the cladding tube (9) by means of a first clamp (3) and a second clamp (4) respectively; Step 2: adjusting the speed at which the cladding tube (9) and the core rod (91) are conveyed downward by setting the power of the motor, thereby controlling the core-to-cladding ratio of the optical fiber monofilament; Step 3: The core rod and the cladding tube (9) enter the heating furnace (5) at a set speed for heating, and after melting, the optical fiber is pulled out under the action of gravity; Step 4: The optical fiber passes through a caliper (6) to measure its diameter; Step 5: The optical fiber is guided by a guide frame (7); Step 6: The optical fiber is wound up by a take-up frame (8).

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