A complete set of equipment for wide-width carbon fiber production

Abstract

This invention provides a complete set of equipment for wide-width carbon fiber production, relating to the field of carbon fiber technology, to solve one of the technical problems of difficult wide-width stable production of carbon fiber, difficulty in controlling thermal field uniformity, and large fluctuations in fiber tension. The equipment includes a fiber-spreading module and an oxidation furnace, a low-temperature carbonization furnace, and a high-temperature carbonization furnace arranged sequentially. The oxidation furnace includes a reaction chamber, an air supply box, a return air box, and a circulating air duct. The air supply box and the return air box are located on opposite sides of the reaction chamber. The air supply box is used to deliver hot air into the reaction chamber. Inside the air supply box, along the direction close to the reaction chamber, there are sequentially arranged air guide plates, a first air plate, a second air plate, and a third air plate. The air guide plates extend inclined towards the reaction chamber along the direction away from the circulating air duct. The ventilation rates of the first, second, and third air plates decrease sequentially. The first distance between the first and second air plates is greater than the second distance between the third and second air plates. This equipment can achieve stable wide-width carbon fiber production.

Description

Technical Field

[0001] This invention relates to the field of carbon fiber technology, and in particular to a complete set of equipment for producing wide-width carbon fiber. Background Technology

[0002] Carbon fiber, as a high-performance fiber material, possesses excellent properties such as high strength, high modulus, and lightweight, and is widely used in aerospace, new energy vehicles, and high-end equipment manufacturing. With the increasing demand from downstream industries for wide-width (over 4m) and high-performance carbon fiber products, traditional narrow-width (≤3m) carbon fiber production equipment can no longer meet the needs of large-scale, high-efficiency production. Therefore, there is an urgent need to develop a complete set of carbon fiber production equipment that can overcome the limitations of traditional narrow-width production and achieve efficient and stable production. Summary of the Invention

[0003] The purpose of this invention is to provide a complete set of equipment for producing wide-width carbon fiber, so as to solve one of the technical problems of difficult wide-width stable production of carbon fiber, difficulty in controlling the uniformity of the thermal field, and large fluctuations in fiber tension.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a complete set of equipment for producing wide-width carbon fiber, including a fiber spreading module and an oxidation furnace, a low-temperature carbonization furnace, and a high-temperature carbonization furnace arranged in sequence. The low-temperature carbonization furnace is used to carbonize carbon fiber at 500℃ to 1000℃, and the high-temperature carbonization furnace is used to carbonize carbon fiber at 1100℃ to 2000℃. The oxidation furnace includes a reaction chamber, an air supply box, a return air box, and a circulating air duct connecting the air supply box and the return air box. The air supply box and the return air box are located on opposite sides of the reaction chamber. The air supply box is used to send hot air into the reaction chamber. Inside the air supply box, a guide plate, a first air plate, a second air plate, and a third air plate are arranged sequentially along the direction close to the reaction chamber. The guide plate extends obliquely toward the reaction chamber along the direction away from the circulating air duct. The ventilation rate of the first air plate, the second air plate, and the third air plate decreases sequentially. The first distance between the first air plate and the second air plate is greater than the second distance between the third air plate and the second air plate. The ventilation rate of the first air panel is 40% to 65%, the ventilation rate of the second air panel is 30% to 40%, and the ventilation rate of the third air panel is 15% to 30%; the first spacing is 200 mm to 300 mm, and the second spacing is 150 mm to 200 mm.

[0005] According to at least one embodiment of the present invention, the fiber spreading module includes multiple fiber spreaders, multiple guide wheels and fiber splitting grids, and multiple carbon fiber bundles are spread into wide bundles after passing through the corresponding fiber spreaders, the corresponding guide wheels and the fiber splitting grids respectively.

[0006] According to at least one embodiment of the present invention, the filament spreader includes an annular body having a filament channel for the filament to pass through and three airflow channels disposed on the body. The axes of each of the airflow channels are perpendicular to and do not pass through the axis of the filament channel, so as to generate vortices in the filament channel.

[0007] According to at least one embodiment of the present invention, the device further includes a dewinding device, which includes a support, a dewinding motor disposed on the support, a tension adjusting device disposed above the support, and a controller communicatively connected to the tension adjusting device.

[0008] According to at least one embodiment of the present invention, the unwinding device further includes a guide roller, the two ends of which are rotatably mounted on the bracket via magnetic levitation bearings; The output shaft of the unwinding motor is connected to the spindle, and the yarn bundles on the spindle pass through the guide roller and the tension adjustment device in sequence to complete the unwinding.

[0009] According to at least one embodiment of the present invention, the tension adjusting device includes a base, two fixed guide wheels, and a movable guide wheel disposed between the two fixed guide wheels; The base has a groove, the rotating shaft of the moving guide wheel is slidably disposed in the groove, and the rotating shafts of the two fixed guide wheels are fixedly disposed on the base; The tension adjustment device also includes a tension sensor disposed on the moving guide wheel, the tension sensor being used to collect the tension of the filament bundle based on the stroke of the moving guide wheel.

[0010] According to at least one embodiment of the present invention, the unwinding motor and the tension sensor are respectively communicatively connected to the controller, and the controller is used to adjust the output speed of the unwinding motor according to the tension collected by the tension sensor.

[0011] According to at least one embodiment of the present invention, the high-temperature carbonization furnace includes a furnace shell, a heating device, and an inner liner for the passage of filament bundles. The heating device includes multiple sets of heating elements, each set of heating elements including multiple heating elements, and the multiple heating elements in the same set surround the periphery of the inner liner.

[0012] According to at least one embodiment of the present invention, along the extension direction of the filament bundle, the space between the inner liner and the furnace shell is divided into a plurality of sub-spaces by a partition plate; Each of the subspaces contains multiple sets of the heating elements.

[0013] According to at least one embodiment of the present invention, the inner liner has a rectangular cross-section and is formed by a graphite plate.

[0014] In one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0015] The wide-width carbon fiber production apparatus provided by the exemplary embodiment of the present invention includes a fiber spreading module and an oxidation furnace, a low-temperature carbonization furnace, and a high-temperature carbonization furnace connected in sequence. The low-temperature carbonization furnace is used to carbonize the carbon fiber at 500°C to 1000°C, and the high-temperature carbonization furnace is used to carbonize the carbon fiber at 1100°C to 2000°C. The oxidation furnace has a closed-loop airflow system consisting of an air supply box, a circulating air duct, and a return air box, so that there is a sufficient and uniform hot air flow field in the reaction chamber of the oxidation furnace to allow the carbon fiber to be fully oxidized. Specifically, a guide vane, a first air vane, a second air vane, and a third air vane are sequentially arranged in the air supply box along the direction close to the reaction chamber, thereby forming three pressure-stabilizing chambers in the air supply box. Through the synergistic optimization of the ventilation rate and relative position of the three air vanes, the CV value of the 4m / s wind speed uniformity in the reaction chamber is reduced to 0.3%. That is, the circulating air can also be uniformly distributed in the wide reaction chamber, which significantly improves the uniformity of the temperature field in the reaction chamber. The temperature difference between the middle and the sides is less than or equal to 2℃, which meets the requirements of thermal field consistency for wide carbon fiber oxidation, realizes a stable and continuous oxidation reaction, and effectively avoids fiber performance fluctuations caused by local overheating or insufficient reaction.

[0016] Furthermore, the fiber spreading module is used to blow apart the monofilaments inside the carbon fiber bundle to form a uniformly dispersed wide fiber bundle, providing an ideal heat conduction and reaction interface for subsequent oxidation and carbonization; this fiber spreading module can improve the efficiency of carbon fiber oxidation and carbonization reaction, making the monofilaments more uniformly heated and more fully oxidized, thereby improving the performance of carbon fiber.

[0017] Furthermore, by incorporating a tension adjustment device in the unwinding unit, and combining a guide roller supported by a magnetic levitation bearing with a high-precision tension sensor, the tension of the filament bundle is collected in real time based on the stroke of the moving guide wheel, and the output speed of the unwinding motor is dynamically adjusted. This controls the tension of each filament bundle, achieving a tension error control of ±0.25% for all filament bundles. Based on this, the tension of each filament bundle within a 4.3-meter width can be made consistent, reducing filament breakage, strand bundling, and mechanical property dispersion caused by uneven tension. Attached Figure Description

[0018] The accompanying drawings illustrate exemplary embodiments of the invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0019] Figure 1 This is an isometric structural schematic diagram of the filament-spreading module according to an embodiment of the present invention; Figure 2 This is a side view of the unwinding device according to an embodiment of the present invention; Figure 3 This is a schematic front view of the unwinding device according to an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of an oxidation furnace according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the longitudinal section structure of a high-temperature carbonization furnace according to an embodiment of the present invention. Figure 6 This is a schematic cross-sectional view of a high-temperature carbonization furnace according to an embodiment of the present invention.

[0020] Figure label: 100. Silk bundle; 11. Supply air box; 111. First air deflector; 112. Second air deflector; 113. Third air deflector; 114. Air guide plate; 12. Circulating air duct; 13. Return air box; 131. Heater; 14. Fan; 20. Wire spreader; 21. Airflow channel; 22. Guide wheel; 23. Wire separating grid; 31. Unwinding motor; 32. Spindle; 33. Guide roller; 34. Base; 341. Slide groove; 35. Fixed guide roller; 36. Moving guide roller; 40. Reaction chamber; 50. Furnace shell; 51. Inner liner; 52. Heating device; 521. Heating element; 53. Divider plate. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] A complete set of equipment for producing wide-width carbon fiber typically includes, in sequence, a de-firing device, a spreading module, an oxidation furnace, a low-temperature carbonization furnace, and a high-temperature carbonization furnace, based on the carbon fiber tow process flow. When the width of the oxidation furnace exceeds 4m, the heat conduction path between the center and the edge of the furnace body differs significantly, easily leading to overheating in the center and underheating at the edges, directly resulting in an increased dispersion coefficient of carbon fiber performance. Furthermore, the replenishment of fresh gas after the exhaust gas from the reaction chamber affects the uniformity of the temperature field within the reaction chamber.

[0023] Example 1 Figure 1 This is an isometric structural schematic diagram of the filament-spreading module according to an embodiment of the present invention; Figure 4This is a schematic cross-sectional view of an oxidation furnace according to an embodiment of the present invention. (Refer to...) Figure 1 and Figure 4 As shown, the wide-width carbon fiber production apparatus provided in the exemplary embodiment of the present invention includes a fiber spreading module and an oxidation furnace, a low-temperature carbonization furnace, and a high-temperature carbonization furnace connected in sequence. The low-temperature carbonization furnace is used to carbonize the carbon fiber at 500°C to 1000°C, and the high-temperature carbonization furnace is used to carbonize the carbon fiber at 1100°C to 2000°C. The oxidation furnace includes a reaction chamber 40, an air supply box 11, a return air box 13, and a circulating air duct 12 connecting the air supply box 11 and the return air box 13. The air supply box 11 and the return air box 13 are located on both sides of the reaction chamber 40, respectively. The air supply box 11... The air supply box 11 is used to send hot air into the reaction chamber 40. Inside the air supply box 11, a guide plate 114, a first air plate 111, a second air plate 112 and a third air plate 113 are arranged in sequence along the direction close to the reaction chamber 40. The guide plate 114 extends obliquely towards the reaction chamber 40 in the direction away from the circulation air duct 12. The ventilation rate of the first air plate 111, the second air plate 112 and the third air plate 113 decreases in sequence. The first distance between the first air plate 111 and the second air plate 112 is greater than the second distance between the third air plate 113 and the second air plate 112.

[0024] The ventilation rate of the first air panel 111 is 40% to 65%, the ventilation rate of the second air panel 112 is 30% to 40%, and the ventilation rate of the third air panel 113 is 15% to 30%; the first spacing is 200 mm to 300 mm, and the second spacing is 150 mm to 200 mm.

[0025] In practical applications, multiple bundles 100 of carbon fiber precursor first pass through a spreading module to uniformly spread the single bundle 100. The multiple spread bundles 100 are then laid out into a continuous wide bundle, which is then pre-oxidized in the reaction chamber 40 of an oxidation furnace. The oxidized wide bundle is then sequentially sent to a low-temperature carbonization furnace for carbonization at 500℃ to 1000℃, and then sent to a high-temperature carbonization furnace for final carbonization at 1100℃ to 2000℃. This continuous production process forms wide carbon fibers with uniform strength.

[0026] For example, the oxidation furnace, low-temperature carbonization furnace, and high-temperature carbonization furnace can all adopt a segmented modular furnace body structure. For instance, the furnace body of the oxidation furnace includes three detachable furnace body units, which are connected by flange sealing, facilitating transportation, installation, and subsequent maintenance.

[0027] The reaction chamber 40 of the oxidation furnace is used to accommodate wide-width filament bundles for pre-oxidation reactions. Figure 4Each row of filament bundles 100 shown is its cross-section. The same filament bundle 100 travels back and forth in the reaction chamber 40, thereby forming multiple rows of wide filament bundles. Around the reaction chamber 40, a closed-loop airflow system is formed by the air supply box 11, the return air box 13, and the circulation duct 12 connecting the air supply box 11 and the return air box 13. This allows the hot air discharged from the reaction chamber 40 to be recovered by the return air box 13, and then re-enter the air supply box 11 through the circulation duct 12, and then be sent back into the reaction chamber 40 by the air supply box 11.

[0028] In practical applications, a fan 14 is installed in the return air box 13 to drive hot air through a high-efficiency filter for dust removal and a heater 131 for precise temperature control before entering the supply air box 11. The circulating air duct 12 is located above the reaction chamber 40. The return air box 13 and the supply air box 11 are located on the left and right sides of the reaction chamber 40, respectively, so that the airflow passes through the filament bundle 100 evenly along the direction perpendicular to the running direction of the filament bundle 100.

[0029] Considering the large width of the filament bundle 100, which makes it difficult to control the uniformity of the temperature field within the reaction chamber 40, the exemplary embodiment of the present invention provides an oxidation furnace with a blower box 11 containing a guide plate 114, a first air plate 111, a second air plate 112, and a third air plate 113 arranged sequentially. The guide plate 114 extends obliquely towards the reaction chamber 40 along a direction away from the circulation duct 12, that is, the guide plate 114 gradually approaches the reaction chamber 40 from top to bottom, thereby allowing the airflow from the upper circulation duct 12 to diffuse evenly and be guided into the reaction chamber 40 under the guidance of the guide plate 114. The first air plate 111, the second air plate 112, and the third air plate 113 can all be vertically arranged within the flow channel, and their ventilation rates decrease progressively. Combined with a layout where the first spacing is greater than the second spacing, the pressure gradient changes gradually as the airflow passes through different air plates, which reduces the disturbance of the filament bundle 100 caused by excessively high local wind speeds and ensures uniform temperature and oxidation reaction within a wide area. The coordinated operation of the three air distribution plates and their corresponding spacing creates three pressure-stabilizing chambers within the airflow channel 21. When the airflow enters the reaction chamber 40, it ensures uniform airflow speed and stable temperature distribution within the reaction chamber 40, with uniform temperature in the middle and on both sides of the reaction chamber 40, and a temperature difference of ≤±2℃.

[0030] Specifically, the ventilation rate of the first air panel 111 is 40% to 65%, for example, it can be 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64% or within any two of the above values.

[0031] The ventilation rate of the second air panel 112 is 30% to 40%, for example, it can be 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, or within any two of the above values.

[0032] The ventilation rate of the third air panel 113 is 15% to 30%, for example, it can be 15%, 17%, 19%, 21%, 23%, 25%, 27%, 29% or within any two of the above values.

[0033] The first spacing is 200mm to 300mm, for example, it can be 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, 300mm or within any two of the above values.

[0034] The second spacing is 150 mm to 200 mm, for example, it can be 150 mm, 160 mm, 170 mm, 180 mm, 190 mm, 200 mm or within any two of the above values.

[0035] Table 1 shows the test results of the circulating air uniformity in the oxidation furnace. The test results show that, under various air vane combinations, the minimum CV value for the uniformity of the 4 m / s air velocity within the reaction chamber 40 is 0.3%, which meets the requirements of the carbon fiber oxidation process for temperature (airflow) uniformity. It should be noted that in all tests in Table 1, the dimensions of each air vane are 3070 mm × 2675 mm.

[0036] Table 1. Test results of circulating air uniformity in the oxidation furnace

[0037] As shown in Table 1, when the ventilation rate of the first air panel 111 is 40.3%, the second air panel 112 is 32.6%, and the third air panel 113 is 17.9%, with a first spacing of 300 mm and a second spacing of 200 mm, the CV value for uniformity of 4 m / s wind speed reaches the optimal level of 0.3%. This combination of parameters indicates that the decreasing ventilation rate and spacing configuration of specific ventilation panels can significantly suppress airflow disturbance. It should be noted that even with a lower ventilation rate for the first air panel 111 (e.g., less than 40.3%), a CV value for uniformity of 4 m / s wind speed can still be achieved, but the ventilation rate is insufficient to meet the rigid requirements of the oxidation process for airflow, easily leading to incomplete carbon fiber oxidation and further increasing energy consumption.

[0038] Example 2 To address the issue of short maintenance cycles for the air deflectors, the apertures on the first air deflector 111, the second air deflector 112, and the third air deflector 113 are optimized based on Embodiment 1. The three air deflectors utilize holes of the same aperture, and the ventilation rate is achieved by controlling the number of holes.

[0039] Table 2 Test results of air deflector diameter in oxidation furnace

[0040] Table 2 shows the test results of the air deflector aperture of the oxidizer. As shown in Table 2, when the aperture of the air deflector is 20 mm, the continuous operation cycle can be extended to more than 95 days, while when the aperture is less than 20 mm, the continuous operation cycle is significantly shortened. When the aperture of the air deflector is greater than 20 mm, although the continuous operation cycle of the air deflector is longer, it will significantly increase the CV value of the 4 m / s wind speed uniformity, making it difficult to guarantee the temperature uniformity of the oxidizer reaction chamber 40.

[0041] Based on this, only by coordinating the aperture, ventilation rate, and corresponding spacing of the three air plates can the temperature field of the reaction chamber 40 be made uniform and the continuous operation cycle be longer, thus reducing the problem of poor quality consistency between carbon fiber batches caused by frequent maintenance.

[0042] Example 3 To address the issues of wire breakage and tangling caused by tension differences between hundreds of large parallel filament bundles (such as 48K), the filament spreading module and the filament unwinding device were further refined based on Embodiment 1 or Embodiment 2.

[0043] Figure 1 This is an isometric structural diagram of the filament-spreading module according to an embodiment of the present invention. Figure 1 As shown, an exemplary embodiment of the present invention provides a complete set of carbon fiber production equipment. The fiber spreading module includes multiple fiber spreaders 20, multiple guide wheels 22 and fiber splitting grids 23. Multiple carbon fiber bundles 100 are spread into wide bundles 100 after passing through the corresponding fiber spreaders 20, the corresponding guide wheels 22 and the fiber splitting grids 23 respectively. The fiber splitting grids 23 can prevent the bundles 100 from sticking together.

[0044] The filament spreader 20 includes an annular body with a filament channel through which the filament bundle 100 passes and three airflow channels 21 disposed on the body; the axis of each airflow channel 21 is perpendicular to and does not pass through the axis of the filament channel, so as to generate vortices in the filament channel.

[0045] In practical applications, after the carbon fiber filament bundles 100 on the spindle 32 are unwound by the unwinding device, each bundle 100 sequentially passes through the bundle channel of the spreader 20 and changes direction around the guide roller 22. Most bundles 100 are concentrated on the same roller and then spread into a wide bundle 100 along the width direction by the comb-shaped filament splitting grid 23. The guide roller 22 and the roller can be supported by magnetic levitation bearings, which can reduce the frictional resistance between the bundles 100 and the guide roller 22 and the roller, thereby improving the tension control accuracy.

[0046] The filament spreader body has three circumferentially evenly distributed airflow channels 21. Compressed air at a pressure of 0.1 MPa is supplied through these three airflow channels 21 and blown tangentially into the filament bundle 100. The axis of the airflow channels 21 is deflected from the center of the filament spreader body to prevent the compressed air from directly blowing onto the filament bundle 100 and causing damage. The three deflected airflows rotate within the filament spreader body 20 to generate gas vortices. These vortices continuously act on the filament bundle 100, blowing away all the monofilaments inside. After being spread and redirected by the guide rollers 22, the filament bundle 100 gathers on the rollers and passes through the filament separating grid 23 before being sent into the oxidation furnace for oxidation treatment.

[0047] Figure 2 This is a side view of the unwinding device according to an embodiment of the present invention; Figure 3 This is a front view structural schematic diagram of a wire unwinding device according to an embodiment of the present invention. (Combined with...) Figure 2 and Figure 3 As shown, before the filament bundle 100 passes through the filament spreading module, each filament bundle 100 needs to be unwound from the original yarn spindle 32 by the unwinding device.

[0048] To address the difficulty in controlling the tension of the yarn bundle 100, the unwinding device includes a support frame, an unwinding motor 31 mounted on the support frame, a tension adjusting device located above the support frame, and a controller communicatively connected to the tension adjusting device. The unwinding device also includes a guide roller 33, whose two ends are rotatably mounted on the support frame via magnetic levitation bearings. The output shaft of the unwinding motor 31 is connected to a spindle 32, and the yarn bundle 100 on the spindle 32 passes sequentially through the guide roller 33 and the tension adjusting device to complete the unwinding process. The rotatable mounting of the guide roller 33 on the support frame via magnetic levitation bearings reduces the frictional resistance between the yarn bundle 100 and the guide roller 33, thereby improving the tension control accuracy.

[0049] Specifically, the tension adjustment device includes a base 34, two fixed guide wheels 35, and a movable guide wheel 36 disposed between the two fixed guide wheels 35. The base 34 has a groove 341, in which the shaft of the movable guide wheel 36 is slidably disposed. The shafts of the two fixed guide wheels 35 are fixedly disposed on the base 34. The tension adjustment device also includes a tension sensor disposed on the movable guide wheel 36, which is used to collect the tension of the yarn bundle 100 based on the stroke of the movable guide wheel 36. The unwinding motor 31 and the tension sensor are respectively connected to a controller, which is used to adjust the output speed of the unwinding motor 31 based on the tension collected by the tension sensor.

[0050] In practical applications, the spindle 32 winding the yarn bundle 100 is directly connected to the unwinding motor 31. After the yarn bundle 100 on the spindle 32 is redirected by the guide roller 33, it passes sequentially through the fixed guide wheel 35, the moving guide wheel 36, and another fixed guide wheel 35. A tension adjustment zone is formed between the two fixed guide wheels 35. Since the rotating shaft of the fixed guide wheel 35 can slide in the slide groove 341, the moving guide wheel 36 is displaced with the tension of the yarn bundle 100. The axis of the slide groove 341 can be arc-shaped, so that the moving guide wheel 36 moves smoothly along a preset trajectory when the tension fluctuates. A tension sensor is installed on the moving guide wheel 36 to collect the displacement of the moving guide wheel 36 in real time and transmit the signal to the controller in real time. The controller has a built-in adaptive algorithm to calculate the tension of the yarn bundle 100 and dynamically adjust the speed of the unwinding motor 31 according to the preset tension threshold, thereby adjusting the tension of each yarn bundle 100, so that the tension error of all yarn bundles 100 can be controlled within ±0.25%.

[0051] Example 4 To address the problem of uneven temperature field in wide-area high-temperature carbonization furnaces, the exemplary embodiments of the present invention further refine the high-temperature carbonization furnace based on Embodiment 1, Embodiment 2, or Embodiment 3.

[0052] Figure 5 This is a schematic diagram of the longitudinal section structure of a high-temperature carbonization furnace according to an embodiment of the present invention. Figure 6 This is a schematic cross-sectional view of a high-temperature carbonization furnace according to an embodiment of the present invention. (Combined with...) Figure 5 and Figure 6 As shown, the high-temperature carbonization furnace includes a furnace shell 50, a heating device 52, and an inner liner 51 through which the wire bundle 100 passes. The inner liner 51 has a rectangular cross-section and is enclosed by graphite plates. The heating device 52 is installed in the space between the inner liner 51 and the furnace shell 50. The heating device 52 uniformly heats the inner liner 51, and the heated graphite plates radiate heat into the interior of the inner liner 51 to carbonize the wire bundle 100.

[0053] The heating device 52 includes multiple sets of heating elements 521, each set of heating elements 521 including multiple heating elements 521, and the multiple heating elements 521 in the same set surround the periphery of the inner liner 51. Along the extension direction of the filament bundle 100, the space between the inner liner 51 and the furnace shell 50 is divided into multiple sub-spaces by a partition plate 53; each sub-space has multiple sets of heating elements 521.

[0054] Along the length of the high-temperature carbonization furnace body (the extension direction of the fiber bundle 100), the partition plate 53 divides the furnace cavity into several independent sub-spaces. Each sub-space corresponds to an independent temperature zone. Each sub-space is equipped with multiple sets of heating elements 521, with each set containing four heating elements 521. The four heating elements 521 are arranged at the top, bottom, left, and right of the inner liner 51, respectively, and are arranged around the inner liner 51 in a cage-like structure to achieve three-dimensional uniform heating. Infrared sensors are installed in each sub-space to monitor the temperature distribution of each temperature zone in real time. The heating power of each sub-space can then be adjusted by the controller to control the uniformity of the temperature field over a wide area. Based on this, by controlling the temperature of the independent sub-spaces, combined with the cage-like heating elements 521 and radiative thermal coupling technology, the temperature fluctuation range of each temperature zone is stabilized, improving the stability and consistency of the carbon fiber carbonization process.

[0055] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A complete set of equipment for producing wide-width carbon fiber, characterized in that, It includes a fiber spreading module and an oxidation furnace, a low-temperature carbonization furnace and a high-temperature carbonization furnace arranged in sequence. The low-temperature carbonization furnace is used to carbonize carbon fibers at 500℃ to 1000℃, and the high-temperature carbonization furnace is used to carbonize carbon fibers at 1100℃ to 2000℃. The oxidation furnace includes a reaction chamber, an air supply box, a return air box, and a circulating air duct connecting the air supply box and the return air box. The air supply box and the return air box are located on both sides of the reaction chamber. The air supply box is used to send hot air into the reaction chamber.

2. The complete set of carbon fiber production equipment according to claim 1, characterized in that, The fiber spreading module includes multiple fiber spreaders, multiple guide wheels, and fiber splitting grids. Multiple carbon fiber bundles are spread into wide bundles after passing through the corresponding fiber spreaders, the corresponding guide wheels, and the fiber splitting grids.

3. The complete set of carbon fiber production equipment according to claim 2, characterized in that, The filament spreader includes a ring-shaped body.

4. The complete set of carbon fiber production equipment according to claim 1, characterized in that, It also includes a wire unwinding device.

5. The complete set of carbon fiber production equipment according to claim 4, characterized in that, The unwinding device also includes guide rollers.

6. The complete set of carbon fiber production equipment according to claim 5, characterized in that, The two ends of the guide roller are rotatably mounted on the support via magnetic levitation bearings.

7. The complete set of carbon fiber production equipment according to claim 1, characterized in that, The high-temperature carbonization furnace includes a furnace shell, a heating device, and an inner liner through which the filament bundle passes.

8. The complete set of carbon fiber production equipment according to claim 7, characterized in that, The heating device includes multiple sets of heating elements, and each set of heating elements includes multiple heating elements.

9. The complete set of carbon fiber production equipment according to claim 8, characterized in that, Multiple heating elements in the same group surround the periphery of the inner liner.

10. The complete set of carbon fiber production equipment according to claim 8, characterized in that, The inner liner has a rectangular cross-section and is formed by a graphite plate.

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