Annealing and drawing furnace and control system thereof

Abstract

The application discloses an annealing wire drawing furnace and a control system thereof, which comprises a wire drawing structure, the wire drawing structure comprises a wire drawing furnace body, the inside of the wire drawing furnace body is fixedly connected with a middle sleeve, the lower middle part of the outer surface of the middle sleeve is fixedly connected with a bottom connector, the lower part of the bottom connector is provided with an annealing structure, the annealing structure comprises an annealing furnace body, and the upper end of the annealing furnace body is fixedly connected with an end connector. Through the arrangement of the annealing furnace body, the newly formed optical fiber after wire drawing is subjected to annealing treatment, the cooling speed of the optical fiber is reduced, the toughness of the produced optical fiber is increased, the produced optical fiber after wire drawing can be conveniently stored, and the damage probability is reduced. In this way, the performance of the product is increased, the structure is relatively simple, the processing cost is relatively low, the practicality is relatively high, the connection strength between the wire drawing structure and the wire drawing tower is higher through the arrangement of the side extension mounting frame and the reinforcing rib, the wire drawing structure is not prone to falling off, and the use stability of the device is increased.

Description

Technical Field

[0001] This invention relates to the field of optical fiber production technology, specifically to an annealing and drawing furnace and its control system. Background Technology

[0002] An optical fiber drawing furnace heats and melts the end of an optical fiber preform while simultaneously moving the preform downwards, drawing it at a certain speed into an optical fiber filament of a certain diameter, thus obtaining an optical fiber.

[0003] In the prior art, such as Chinese patent CN111348826B, an optical fiber drawing furnace is disclosed, which includes: a heat preservation cylinder and a heating element inserted into the heat preservation cylinder. The heating element and the heat preservation cylinder are coaxially arranged. The heat preservation cylinder has a feed port along the axial direction. The heating element forms a material rod insertion channel and a wire outlet channel along the axial direction. The optical fiber drawing furnace also includes: a sealed container, a feed pipe connector, an outlet pipe connector, a first air inlet pipe and a second air inlet pipe. The sealed container includes: a cylinder that houses the heating element and the heat preservation cylinder, a top plate and a bottom plate of the sealed cylinder, a feed pipe connector set on the top plate, and the feed pipe connector also has an air inlet end for introducing protective gas. The outlet pipe connector is set on the bottom plate, the first air inlet pipe is set on the cylinder, and the second air inlet pipe is set on the bottom plate.

[0004] However, in the existing technology, during the production of glass optical fiber, the preform is heated in a drawing furnace to melt it and draw it into fibers. When the preform is drawn into fibers, an inert gas needs to be introduced into the drawing furnace to ensure that there is no oxygen in the drawing furnace, thereby increasing the performance of the glass optical fiber and facilitating subsequent winding and forming. However, in this way, the toughness of the glass optical fiber is still relatively low, and it is prone to breakage during subsequent packaging and use, resulting in poor performance. Summary of the Invention

[0005] The purpose of this invention is to provide an annealing drawing furnace and its control system to solve the problem mentioned in the background art: in the production process of glass optical fiber, the preform is heated in the drawing furnace to melt it for drawing. During the drawing of the preform, an inert gas needs to be introduced into the drawing furnace to ensure that there is no oxygen in the drawing furnace, thereby increasing the performance of the glass optical fiber and facilitating subsequent winding and forming. However, in this way, the toughness of the glass optical fiber is still low, and it is easy to break during subsequent packaging and use, resulting in poor performance.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an annealing and drawing furnace and its control system, comprising a drawing structure, the drawing structure comprising a drawing furnace body, a middle sleeve fixedly connected inside the drawing furnace body, a bottom connector fixedly connected below the middle part of the outer surface of the middle sleeve, an annealing structure disposed below the bottom connector, the annealing structure comprising an annealing furnace body, an end connector fixedly connected to the upper end of the annealing furnace body, a second heating element disposed inside the annealing furnace body, a connecting seat fixedly connected to one end of the second heating element, a side sealing frame fixedly connected to one side of the annealing furnace body, an electric telescopic rod fixedly connected to the lower end of the inside of the side sealing frame, an extended side plate fixedly connected to the middle part of one side of the connecting seat, the extended side plate being connected to the output end of the electric telescopic rod.

[0007] Preferably, the interior of the wire drawing furnace body is provided with a heat insulation body, the interior of the heat insulation body is provided with a heat insulation layer, a heating element is installed between the heat insulation layer and the heat insulation body, and the heat insulation layer is sleeved with the middle sleeve.

[0008] Preferably, a side-extending mounting bracket is fixedly connected to the lower middle part of the outer surface of the wire drawing furnace body, and a reinforcing rib is fixedly connected between the upper end of the side-extending mounting bracket and the outer surface of the wire drawing furnace body.

[0009] Preferably, a No. 1 reinforcing sleeve and a No. 2 reinforcing sleeve are respectively installed at the upper and lower ends of the wire drawing furnace body, a sealing device is installed at both the upper and lower ends of the middle sleeve, a disc is installed at the upper end of the middle sleeve, and a metal rod is installed inside the disc.

[0010] Preferably, the outer surface of the middle sleeve is fixedly connected to a second gas guide pipe, a first gas guide pipe, and a third gas guide pipe, and a first thermocouple is provided at the upper end of the middle sleeve.

[0011] Preferably, a second reinforcing frame is fixedly connected to the lower part of the middle of the outer surface of the middle sleeve, and a first fixing frame is fixedly connected to the upper part of the middle of the outer surface of the middle sleeve.

[0012] Preferably, a limiting block is fixedly connected to the outer edge of the lower end of the bottom connector, and an assembly bottom block is fixedly connected to the lower end of the limiting block. An assembly opening is provided on the outer ring surface of the end connector, and an installation hole is provided through the interior of the bottom connector, with the installation hole located between the two limiting blocks.

[0013] Preferably, a side frame is installed on one side of the side sealing frame, a transparent plate is installed inside the side frame, a bottom opening is installed at the lower end of the annealing furnace body, an extension strip is fixedly connected to one side of the interior of the annealing furnace body, a sliding groove is formed between the extension strip and the middle of one side of the annealing furnace body, and the connecting seat is slidably connected to the sliding groove.

[0014] Preferably, a connecting rod is fixedly connected to the lower end of the extended side plate, a sliding cavity is provided in the middle of the upper end of the output end of the electric telescopic rod, the connecting rod is slidably connected to the sliding cavity, a cover is fixedly connected to the upper end of the electric telescopic rod, the cover is slidably connected to the connecting rod, a first spring is installed between the cover and the connecting rod, the first spring is sleeved with the connecting rod, an end groove is fixedly connected to the middle of the upper and lower ends of the connecting seat, a limiting sliding hole is provided on both sides of the end groove, a middle block is provided between the upper and lower connecting seats, a second spring is fixedly connected to the middle of the upper and lower ends of the middle block, one end of the second spring is fixedly connected to the end groove, a limiting sliding rod is fixedly connected to both sides of the middle of the upper and lower ends of the middle block, the limiting sliding rod is slidably connected to the limiting sliding hole, and a second thermocouple is installed on one side of the middle block.

[0015] A control system for an annealing and drawing furnace includes a data receiving module, a laser diameter measuring instrument, a data processing module, and a control module; The data receiving module is used to receive the detection data from thermocouple No. 1, thermocouple No. 2, and the laser diameter measuring instrument; The laser diameter measuring instrument is located below the bottom opening to detect the diameter of the annealed optical fiber; The data processing module is used to combine temperature data and fiber diameter data for analysis, and calculate the appropriate power for the second heating element and the extension length of the electric telescopic rod according to production needs. The control module is used to control the power of the second heating element and the first heating element to achieve wire drawing processing of the preform at different temperatures, and to control the extension length of the electric telescopic rod to adjust the distance between each second heating element.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, by setting up an annealing furnace, the optical fiber that has just been drawn is annealed, which reduces the cooling rate of the optical fiber and increases the toughness of the produced optical fiber. This makes the drawn optical fiber easier to store and reduces the probability of damage. In this way, the performance of the product is improved. Moreover, this method has a relatively simple structure, low processing cost, and high practicality. By setting up the side extension mounting bracket and reinforcing ribs, the connection strength between the drawing structure and the drawing tower is higher and less likely to fall off, which increases the stability of the device in use.

[0017] 2. In this invention, by setting up the limiting block and the assembly base block, when connecting the drawing structure and the annealing structure, the assembly port can be passed through the assembly base block and then the annealing furnace body can be rotated. This allows the assembly base block to restrict the end connector, which facilitates the installation of bolts and the alignment of the assembly port with the mounting hole. This makes the installation between the drawing structure and the annealing structure easier. By setting up the electric telescopic rod, multi-stage annealing heating at different temperatures is adopted, making the annealing of the optical fiber smoother, rather than passing through the annealing furnace at the same temperature. This makes the temperature drop of the optical fiber after flowing out of the inner sleeve smoother, increasing the annealing effect.

[0018] 3. In this invention, the flexible connection between the extension side plate and the electric telescopic rod is achieved through the setting of the connecting rod and the sliding cavity. This avoids mutual compression between the two connecting seats when the electric telescopic rod experiences accuracy problems after long-term use, thereby reducing the probability of damage. The setting of the second spring ensures that the second thermocouple is located in the middle between the two connecting seats. The setting of the limiting slide rod restricts the position of the second thermocouple, ensuring its stability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an annealing and drawing furnace according to the present invention; Figure 2 This is a schematic diagram of the internal structure of the wire drawing structure in an annealing and wire drawing furnace according to the present invention; Figure 3 This is a three-dimensional structural diagram of the bottom support of an annealing and drawing furnace according to the present invention; Figure 4 This is a three-dimensional structural diagram of the annealing structure in an annealing and drawing furnace according to the present invention; Figure 5 This is an exploded view of the annealing structure in an annealing and drawing furnace according to the present invention; Figure 6 This is a three-dimensional structural diagram of the wire drawing structure in an annealing and wire drawing furnace according to the present invention; Figure 7 This is an exploded view of the connection structure of the second heating element in an annealing and drawing furnace according to the present invention. Figure 8 This is a three-dimensional structural diagram of the intermediate charge block in an annealing and drawing furnace according to the present invention.

[0020] In the picture: 1. Wire drawing structure; 11. Wire drawing furnace body; 12. Side extension mounting bracket; 13. Reinforcing rib; 14. First gas guide pipe; 15. Metal rod; 16. First reinforcing sleeve; 17. Middle sleeve; 18. Second gas guide pipe; 19. First thermocouple; 110. Disc; 111. First fixing bracket; 112. Second reinforcing sleeve; 113. Third gas guide pipe; 114. Bottom connector; 115. Insulation body; 116. Heat insulation layer; 117. First heating element; 118. Second reinforcing bracket; 119. Sealing device; 120. Limiting block; 121. Assembly base block; 122. Mounting hole; 2. Annealing structure; 21. Annealing furnace body; 22. Side mounting frame; 23. Transparent plate; 24. Bottom opening; 25. End connector; 26. Assembly port; 27. Side sealing frame; 28. Slide groove; 29. ​​No. 2 heating element; 210. Connecting seat; 211. Middle mounting block; 212. Electric telescopic rod; 213. Extension strip; 214. Connecting rod; 215. Slide cavity; 216. No. 1 spring; 217. Cover; 218. End groove; 219. Limiting slide hole; 220. Limiting slide rod; 221. No. 2 spring; 222. No. 2 thermocouple; 223. Extension side plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Refer to Figure 1 - Figure 8As shown: An annealing and drawing furnace includes a drawing structure 1, which includes a furnace body 11. A middle sleeve 17 is fixedly connected inside the furnace body 11. A bottom connector 114 is fixedly connected to the lower middle part of the outer surface of the middle sleeve 17. An annealing structure 2 is arranged below the bottom connector 114. The annealing structure 2 includes an annealing furnace body 21. An end connector 25 is fixedly connected to the upper end of the annealing furnace body 21. A second heating element 29 is arranged inside the annealing furnace body 21. One end of the second heating element 29 is fixedly connected to... A connecting seat 210 is connected to one side of the annealing furnace body 21. A side sealing frame 27 is fixedly connected to one side of the side sealing frame 27. An electric telescopic rod 212 is fixedly connected to the lower end of the inside of the side sealing frame 27. An extension side plate 223 is fixedly connected to the middle of one side of the connecting seat 210. The extension side plate 223 is connected to the output end of the electric telescopic rod 212. An insulation body 115 is provided inside the wire drawing furnace body 11. A heat insulation layer 116 is provided inside the heat insulation body 115. A heating element 11 is installed between the heat insulation layer 116 and the heat insulation body 115. 7. The heat insulation layer 116 is sleeved with the middle sleeve 17. A side extension mounting bracket 12 is fixedly connected to the lower middle part of the outer surface of the wire drawing furnace body 11. A reinforcing rib 13 is fixedly connected between the upper end of the side extension mounting bracket 12 and the outer surface of the wire drawing furnace body 11. A first reinforcing sleeve 16 and a second reinforcing sleeve 112 are respectively installed at the upper and lower ends of the wire drawing furnace body 11. Sealing devices 119 are installed at both the upper and lower ends of the middle sleeve 17. A disc 110 is installed at the upper end of the middle sleeve 17. A metal rod 15 is installed inside the disc 110. The outer surface of the middle sleeve 17 is fixedly connected to the second gas guide pipe 18, the first gas guide pipe 14 and the third gas guide pipe 113. The upper end of the middle sleeve 17 is provided with a first thermocouple 19. The lower middle part of the outer surface of the middle sleeve 17 is fixedly connected to the second reinforcing frame 118. The upper middle part of the outer surface of the middle sleeve 17 is fixedly connected to the first fixing frame 111. The temperature inside the annealing furnace body 21 is lower than the temperature inside the middle sleeve 17 and the temperature difference is less than 100℃. The temperature of each second heating element 29 decreases from top to bottom.

[0023] In this invention, the annealing furnace body 21 is used to anneal the freshly drawn optical fiber, which reduces the cooling rate of the optical fiber and increases the toughness of the produced optical fiber. This makes the drawn optical fiber easier to store and reduces the probability of damage. In this way, the performance of the product is improved. Moreover, this method has a simple structure, low processing cost, and high practicality. The side extension mounting bracket 12 and the reinforcing rib 13 make the connection between the drawing structure 1 and the drawing tower stronger and less prone to falling off, thus increasing the stability of the device.

[0024] Example 2: Figure 1 - Figure 8As shown, a limiting block 120 is fixedly connected to the outer edge of the lower end of the bottom connector 114, and an assembly bottom block 121 is fixedly connected to the lower end of the limiting block 120. An assembly opening 26 is opened on the outer ring surface of the end connector 25. An installation hole 122 is opened through the interior of the bottom connector 114. The installation hole 122 is located between the two limiting blocks 120. A side frame 22 is installed on one side of the side sealing frame 27. A transparent plate 23 is installed inside the side frame 22. A bottom opening 24 is installed at the lower end of the annealing furnace body 21. An extension strip 213 is fixedly connected to one side of the interior of the annealing furnace body 21. A sliding groove 28 is opened between the extension strip 213 and the middle of one side of the annealing furnace body 21. The connecting seat 210 is slidably connected to the sliding groove 28. The number of connecting seats 210 and the second heating element 29 is set according to the requirements. The height of the second heating element 29 is less than the height of the connecting seat 210 to avoid contact and squeezing between the upper and lower second heating elements 29 and reduce the probability of damage.

[0025] In this invention, by setting the limiting block 120 and the assembly base block 121, when connecting the drawing structure 1 and the annealing structure 2, the assembly port 26 can be passed through the assembly base block 121 and then the annealing furnace body 21 can be rotated, so that the assembly base block 121 can restrict the end connector 25. This facilitates the installation of bolts and the alignment of the assembly port 26 with the mounting hole 122, making the installation between the drawing structure 1 and the annealing structure 2 easier. By setting the electric telescopic rod 212, multi-stage annealing heating at different temperatures is adopted, making the annealing of the optical fiber smoother, rather than passing through the annealing furnace body 21 at the same temperature. This makes the temperature drop of the optical fiber after flowing out of the middle sleeve 17 smoother, increasing the annealing effect.

[0026] Example 3: According to Figure 5 , Figure 7 and Figure 8As shown, a connecting rod 214 is fixedly connected to the lower end of the extended side plate 223. A sliding cavity 215 is provided in the middle of the upper end of the output end of the electric telescopic rod 212. The connecting rod 214 is slidably connected to the sliding cavity 215. A cover 217 is fixedly connected to the upper end of the electric telescopic rod 212. The cover 217 is slidably connected to the connecting rod 214. A first spring 216 is installed between the cover 217 and the connecting rod 214. The first spring 216 is sleeved with the connecting rod 214. An end groove 218 is fixedly connected to the middle of the upper and lower ends of the connecting seat 210. Limiting sliding holes 219 are provided on both sides of the end groove 218. A middle block 211 is provided between the upper and lower connecting seats 210. A second spring 221 is fixedly connected to the middle of the upper and lower ends of the middle block 211. One end of the second spring 221 is fixedly connected to the end groove 218. The two second springs 221 have different elasticity. Limiting slide rods 220 are fixedly connected to both sides of the middle of the upper and lower ends of the middle block 211. The limiting slide rods 220 are slidably connected to the limiting slide holes 219. A second thermocouple 222 is installed on one side of the middle block 211. Through the setting of the connecting rod 214 and the sliding cavity 215, the extension side plate 223 and the electric telescopic rod 212 are flexibly connected. This can prevent the two connecting seats 210 from squeezing each other when the electric telescopic rod 212 is used for a long time and the accuracy is affected, thereby reducing the probability of damage. The setting of the second spring 221 is used to ensure that the second thermocouple 222 is located in the middle between the two connecting seats 210. The setting of the limiting slide rod 220 is used to limit the position of the second thermocouple 222 and ensure the stability of the second thermocouple 222.

[0027] Example 4: A control system for an annealing and drawing furnace, comprising a data receiving module, a laser diameter measuring instrument, a data processing module, and a control module; The data receiving module is used to receive the detection data from thermocouple 19, thermocouple 222, and the laser diameter measuring instrument; A laser diameter gauge is positioned below the bottom port 24 to measure the diameter of the annealed optical fiber. The data processing module is used to combine and analyze temperature data and fiber diameter data. Based on production needs, it calculates the appropriate power for the second heating element 29 and the extension length of the electric telescopic rod 212. When changing the preform for fiber drawing, it is necessary to observe the state of the fiber after cooling. If the fiber crystallization or internal stress does not reach the qualified value, the control module needs to synchronously adjust the power of each second heating element 29 to adjust the cooling rate of fiber drawing and ensure the qualification rate of fiber production. The control module is used to control the power of the second heating element 29 and the first heating element 117 to achieve wire drawing processing of the preform at different temperatures, and to control the extension length of the electric telescopic rod 212 to adjust the distance between each second heating element 29.

[0028] In this invention, by combining thermocouple 222 with a laser diameter measuring instrument, the diameter of the optical fiber can be monitored in real time during the glass fiber drawing process. The power of heating element 117 and each heating element 29, as well as the extension length of the electric telescopic rod 212, are adjusted by the data processing module and the control module to produce qualified glass optical fibers. The use of multiple controls provides a high degree of control over the production of optical fibers, thereby increasing the yield rate of optical fibers.

[0029] The operating method and working principle of this device are as follows: During use, a glass preform is installed inside the middle sleeve 17. The glass preform is heated and melted by the first heating element 117, and then drawn into fibers. The molten and drawn glass falls into the annealing structure 2 to anneal the optical fiber. The diameter of the optical fiber is detected by a laser diameter gauge, and the annealing temperature of the optical fiber is monitored by the second thermocouple 222. Data is transmitted to the data receiving module. When the produced optical fiber is relatively thin, the control module controls the second heating element 29 to reduce the power, thereby lowering the annealing temperature, increasing the optical fiber cooling time, and increasing the optical fiber diameter until the desired diameter is achieved. When the optical fiber is thicker, the power of the second heating element 29 is increased, the cooling time of the optical fiber is reduced, and the diameter of the optical fiber is reduced until the required diameter is reached. During this process, the distance between each second heating element 29 is adjusted according to the power of the second heating element 29 and the temperature detected by the second thermocouple 222 to ensure a smooth annealing temperature. The drawn optical fiber is wound and stored by the take-up wheel. The winding speed is greater than the feeding speed of the preform. The winding speed is 2-5 times the feeding speed of the preform. The specific ratio is fed back to the motor control system by the data measured by the drawing speed scanner and the laser diameter measuring instrument to match the feeding speed and rotation speed.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An annealing and drawing furnace, comprising a drawing structure (1), characterized in that, The wire drawing structure (1) includes a wire drawing furnace body (11), with a middle sleeve (17) fixedly connected inside the wire drawing furnace body (11). A bottom connector (114) is fixedly connected below the middle part of the outer surface of the middle sleeve (17). An annealing structure (2) is provided below the bottom connector (114). The annealing structure (2) includes an annealing furnace body (21), with an end connector (25) fixedly connected to the upper end of the annealing furnace body (21). The furnace body (21) is equipped with a second heating element (29). One end of the second heating element (29) is fixedly connected to a connecting seat (210). A side sealing frame (27) is fixedly connected to one side of the annealing furnace body (21). An electric telescopic rod (212) is fixedly connected to the lower end of the side sealing frame (27). An extension side plate (223) is fixedly connected to the middle of one side of the connecting seat (210). The extension side plate (223) is connected to the output end of the electric telescopic rod (212).

2. The annealing and drawing furnace according to claim 1, characterized in that: The drawing furnace body (11) is provided with an insulation body (115) inside, and an insulation layer (116) is provided inside the insulation body (115). A heating element (117) is installed between the insulation layer (116) and the insulation body (115). The insulation layer (116) is sleeved with the middle sleeve (17).

3. The annealing and drawing furnace according to claim 2, characterized in that: A side extension mounting bracket (12) is fixedly connected to the lower middle part of the outer surface of the wire drawing furnace body (11), and a reinforcing rib (13) is fixedly connected between the upper end of the side extension mounting bracket (12) and the outer surface of the wire drawing furnace body (11).

4. The annealing and drawing furnace according to claim 3, characterized in that: The upper and lower ends of the wire drawing furnace body (11) are respectively equipped with a first reinforcing sleeve (16) and a second reinforcing sleeve (112). The upper and lower ends of the middle sleeve (17) are equipped with sealing devices (119). The upper end of the middle sleeve (17) is equipped with a disc (110). The inside of the disc (110) is equipped with a metal rod (15).

5. The annealing and drawing furnace according to claim 4, characterized in that: The outer surface of the middle sleeve (17) is fixedly connected to the second gas guide pipe (18), the first gas guide pipe (14) and the third gas guide pipe (113), and a first thermocouple (19) is provided at the upper end of the middle sleeve (17).

6. The annealing and drawing furnace according to claim 5, characterized in that: A second reinforcing frame (118) is fixedly connected to the lower middle part of the outer surface of the middle sleeve (17), and a first fixing frame (111) is fixedly connected to the upper middle part of the outer surface of the middle sleeve (17).

7. The annealing and drawing furnace according to claim 6, characterized in that: A limiting block (120) is fixedly connected to the outer edge of the lower end of the bottom connector (114). An assembly bottom block (121) is fixedly connected to the lower end of the limiting block (120). An assembly opening (26) is provided on the outer ring surface of the end connector (25). An installation hole (122) is provided through the interior of the bottom connector (114). The installation hole (122) is located between the two limiting blocks (120).

8. The annealing and drawing furnace according to claim 7, characterized in that: A side frame (22) is installed on one side of the side sealing frame (27), and a transparent plate (23) is installed inside the side frame (22). A bottom opening (24) is installed at the lower end of the annealing furnace body (21). An extension strip (213) is fixedly connected to one side of the interior of the annealing furnace body (21). A sliding groove (28) is provided between the extension strip (213) and the middle of one side of the annealing furnace body (21). The connecting seat (210) is slidably connected to the sliding groove (28).

9. The annealing and drawing furnace according to claim 8, characterized in that: A connecting rod (214) is fixedly connected to the lower end of the extended side plate (223). A sliding cavity (215) is provided in the middle of the upper end of the output end of the electric telescopic rod (212). The connecting rod (214) is slidably connected to the sliding cavity (215). A cover (217) is fixedly connected to the upper end of the electric telescopic rod (212). The cover (217) is slidably connected to the connecting rod (214). A first spring (216) is installed between the cover (217) and the connecting rod (214). The first spring (216) is sleeved with the connecting rod (214). The middle of the upper and lower ends of the connecting seat (210) are fixedly connected to... There is an end groove (218), and limit sliding holes (219) are provided on both sides of the end groove (218). A middle block (211) is provided between the upper and lower connecting seats (210). A second spring (221) is fixedly connected to the middle of the upper and lower ends of the middle block (211). One end of the second spring (221) is fixedly connected to the end groove (218). Limit sliding rods (220) are fixedly connected to both sides of the middle of the upper and lower ends of the middle block (211). The limit sliding rods (220) are slidably connected to the limit sliding holes (219). A second thermocouple (222) is installed on one side of the middle block (211).

10. A control system for an annealing and drawing furnace, characterized in that: An annealing and drawing furnace according to any one of claims 1-9 is used, comprising a data receiving module, a laser diameter measuring instrument, a data processing module, and a control module; The data receiving module is used to receive the detection data of thermocouple No. 1 (19), thermocouple No. 2 (222) and laser diameter measuring instrument; The laser diameter measuring instrument is located below the bottom opening (24) to detect the diameter of the annealed optical fiber; The data processing module is used to combine temperature data and fiber diameter data for analysis, and calculate the appropriate power for the second heating element (29) and the extension length of the electric telescopic rod (212) according to production needs. The control module is used to control the power of the second heating element (29) and the first heating element (117) to achieve wire drawing processing of the preform at different temperatures, and to control the extension length of the electric telescopic rod (212) to adjust the distance between each second heating element (29).

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