Continuous heat treatment apparatus and carbon fiber heat treatment process

Abstract

The application discloses a continuous heat treatment equipment and a carbon fiber heat treatment process. The continuous heat treatment equipment comprises a furnace body, a feeding system, a collecting system and a plurality of electrodes arranged in the furnace body. The feeding system and the collecting system are arranged on the same side wall outside of the furnace body, and a laser emitter is arranged on the top wall of the furnace body. A plurality of first rotating shafts and a plurality of second rotating shafts are arranged in the furnace body, and the first rotating shafts and the second rotating shafts are rotationally connected with the side wall of the furnace body. The surfaces formed by the plurality of first rotating shafts are located above the surfaces formed by the plurality of second rotating shafts. The plurality of first rotating shafts rotate in the same direction, and the plurality of second rotating shafts rotate in the same direction. The light source of the laser emitter is directed to the surfaces formed by the plurality of first rotating shafts, and the plurality of electrodes are arranged around the plurality of second rotating shafts. The equipment solves the technical problem that it is difficult to reach a heat treatment temperature above 2800 DEG C in the prior art on the basis of ensuring the strength of carbon fibers and reducing production cost.

Description

Technical Field

[0001] This invention belongs to the technical field of heat treatment equipment, specifically relating to a continuous heat treatment equipment and a carbon fiber heat treatment process. Background Technology

[0002] High-strength, high-modulus carbon fiber possesses characteristics such as lightweight, high strength, high modulus, high thermal and electrical conductivity, high dimensional stability, low coefficient of thermal expansion, high chemical resistance, and high temperature resistance. It also exhibits the inherent properties of carbon materials while combining the flexibility and processability of textile fibers. As a reinforcing fiber, carbon fiber is not only an irreplaceable key material in the main and functional structures of satellites and spacecraft, but also widely used in sports equipment, racing cars, and high-end civilian products. High-temperature graphitization technology is a key technology for preparing high-modulus, high-strength carbon fiber. Through stretching at high temperatures, carbon fiber forms a highly ordered graphite structure, thereby achieving high tensile modulus. Increasing the heat treatment temperature can further enhance the degree of graphitization, achieving even higher tensile modulus. Conventional industrially applicable high-temperature processing equipment includes resistance furnaces and induction furnaces. Resistance furnaces typically use silicon-carbon as the heating resistor. A feeding system is located outside the furnace inlet, and a receiving system is located outside the furnace outlet. These feeding and receiving systems constitute the carbon fiber tensioning system. Heating by applying a large current is limited by the inherent heating power of the resistive material and the insulation technology, typically reaching a maximum temperature of 2500℃, which cannot reach the 2800℃ or higher required for graphitization. Induction furnaces, which use high-frequency induction heating, can heat workpieces to over 2800℃, with a maximum of 3100℃, but this equipment has extremely high energy consumption, a short lifespan for the hot zone materials in the furnace, and high manufacturing and maintenance costs.

[0003] To reduce costs, continuous production equipment is typically used for the continuous production of carbon fibers. Chinese invention patent application publication number CN106458595A discloses a continuous graphitization furnace for carbon fibers. It uses a DC power supply applied to a pair of energized rollers, utilizing the self-heating of the material being processed through the current to achieve heating. This method has a relatively simple structure and low manufacturing cost, but the uneven resistance of the material itself can easily lead to uneven heating, thus reducing the heat treatment effect. Chinese invention patent application publication number CN106480549A discloses a continuous heat treatment device that uses multiple non-coplanar rotating electrodes to heat the material by passing an electric current through it. Simultaneously, the electrodes form a tensioning system. This device can reduce or eliminate the temperature gradient between the core and the outer skin, thereby reducing the probability of the core-skin structure appearing. However, this device still uses the principle of resistance heating, resulting in low heating efficiency and difficulty in reaching temperatures above 2800℃. Chinese invention patent application publication number CN106521712A discloses a controllable laser-based ultra-high temperature graphitization device for carbon fibers. It uses one or more laser heads to directly heat the carbon fibers for high-temperature treatment, and adjusts the tension of the carbon fibers through a fiber feeding and winding device. Laser heating is highly efficient and consumes little energy. Continuous production can reduce production costs. However, the direct action of the laser on the carbon fibers causes them to heat up rapidly from room temperature to over 2800°C to complete graphitization. This rapid heating can easily cause uneven temperature gradients on the cross-section of the carbon fibers, leading to cracks and reducing the strength of the carbon fibers. Chinese invention patent application publication number CN104760953A discloses a laser tunnel total internal reflection axial focusing carbon fiber graphitization furnace. The furnace uses multiple sets of plane mirrors to reflect and focus laser light onto the axis of the graphitization cavity to form a heating zone. The cavity temperature is controlled by adjusting the number of five-stage glass plates and the angle of the plane mirrors. The laser heating source used in this method greatly improves graphitization efficiency and reduces energy consumption and cost. However, it requires precise control of laser reflection and focusing, which places extremely high demands on the overall processing accuracy. At the same time, it also requires extremely high high temperature resistance of the plane mirrors. The manufacturing difficulty and cost of the entire device are relatively high, making it unsuitable for mass production. Summary of the Invention

[0004] In view of the existing technical problems, the present invention aims to provide a continuous heat treatment equipment and a carbon fiber heat treatment process. This equipment can solve the technical problem in the prior art that it is difficult to achieve a heat treatment temperature of more than 2800°C while ensuring the strength of carbon fiber and reducing production costs.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A continuous heat treatment device includes a furnace body, a feeding system, a receiving system, and multiple electrodes disposed within the furnace body. Its structural features are as follows: the feeding system and the receiving system are both located on the outer side of the same side wall of the furnace body; a laser emitter is mounted on the top wall of the furnace body; multiple first rotating shafts and multiple second rotating shafts are disposed within the furnace body, both first and second rotating shafts being rotatably connected to the side wall of the furnace body; the surface formed by the multiple first rotating shafts is located above the surface formed by the multiple second rotating shafts; the multiple first rotating shafts rotate in the same direction, and the multiple second rotating shafts rotate in the same direction; the light source of the laser emitter faces the surface formed by the multiple first rotating shafts; and the multiple electrodes are disposed around the multiple second rotating shafts.

[0007] In the continuous heat treatment equipment of this application, carbon fibers enter the furnace chamber through the feeding system. After passing around each second rotating shaft, the carbon fibers turn upwards and pass around each first rotating shaft, finally being retrieved by the receiving system. The feeding system, second rotating shafts, first rotating shafts, and receiving system constitute a traction system for heating the carbon fibers. The tension of the carbon fibers is controlled by adjusting the speed difference between feeding and receiving. The electrodes can be made of graphite electrodes, carbon-carbon composite electrodes, or other similar materials, and preheat the carbon fibers located around the second rotating shafts. After entering the furnace, the carbon fibers move within the furnace under the traction of the second rotating shafts while being preheated by the electrodes, reaching a temperature of approximately 2300℃. When the carbon fibers turn upwards and enter the upper first rotating shaft, a laser emitted from a laser emitter rapidly heats the carbon fibers located below the laser emitter. Laser heating offers high efficiency and low energy consumption. By adjusting the laser beam shaper to control the shape, size, and energy distribution of the output spot, carbon fibers can be rapidly heated from the preheating temperature to the set heat treatment temperature, such as 2800℃, 3000℃, or higher. The continuous heat treatment equipment of this invention places the electrodes and laser emitter within the same furnace. After entering the furnace, the carbon fibers are first preheated by the electrodes and then heated by the high-temperature laser, creating a gradient temperature rise that avoids core-skin problems. The carbon fiber temperature can reach 2800℃ or higher, and it avoids the cracking caused by rapid heating from room temperature to 2800℃, resulting in higher carbon fiber strength and modulus. The continuous heat treatment equipment of this invention can control the temperature of the heating electrodes at around 2300℃, resulting in a longer electrode lifespan and reduced production costs. This continuous heat treatment equipment, using laser heating, offers higher heat treatment efficiency and lower energy consumption.

[0008] Preferably, both the first and second rotating shafts are arranged along the width direction of the furnace body. The first rotating shaft has multiple first guide grooves along its length, arranged circumferentially. The second rotating shaft has multiple second guide grooves along its length, also arranged circumferentially. Both the first and second guide grooves serve as guides for the movement of the carbon fiber. By using the first and second guide grooves as guides for the movement of the carbon fiber, the carbon fiber bundle can be unfolded into multiple clusters of small bundles, preventing disturbance between the clusters and ensuring more uniform heating of the carbon fiber.

[0009] Preferably, the first guide groove and the second guide groove are staggered, and their projections on the bottom wall of the furnace are adjacent to each other. By setting the positions of the first and second guide grooves, when the carbon fibers move inside the furnace, the projection of the upper carbon fiber falls exactly into the gap of the lower carbon fiber, and there is no gap between adjacent bundles of carbon fibers when viewed from above. When the laser emitted by the laser emitter heats the carbon fibers, the laser at the gap of the upper carbon fiber bundle will irradiate the lower carbon fiber bundle, thereby preventing the laser from leaking below the lower carbon fiber bundle and causing damage to the furnace bottom wall, insulation layer, etc. due to overheating.

[0010] Preferably, a plurality of first guide grooves are evenly spaced along the length of the first rotating shaft, and a plurality of second guide grooves are evenly spaced along the length of the second rotating shaft; the width of the first guide groove is equal to the distance between two adjacent second guide grooves, and the width of the second guide groove is equal to the distance between two adjacent first guide grooves. The widths of the first and second guide grooves can be set to be equal. By setting the size and position of the first and second guide grooves, the distribution and heating of the carbon fibers become more uniform.

[0011] Preferably, electrodes are provided below the second rotating shaft, between the first and second rotating shafts, and above the first rotating shaft. The electrodes above the first rotating shaft are positioned around the laser emitter irradiation area. By adjusting the electrode positions, both the upper and lower surfaces of the carbon fiber can be heated uniformly. Furthermore, as the carbon fiber is removed from the furnace after being heated by the laser emitter, the number of electrodes around the carbon fiber decreases while the heating power of the electrodes can be adjusted, creating a gradient cooling effect on the carbon fiber surface and preventing a rapid temperature drop.

[0012] Preferably, the multiple electrodes are arranged at uniform intervals along the length of the furnace body.

[0013] Preferably, the multiple first rotating shafts and multiple second rotating shafts are evenly spaced along the length of the furnace body. The multiple first rotating shafts are located on the same plane, and the multiple second rotating shafts are also located on the same plane, with the plane containing the multiple first rotating shafts parallel to the plane containing the multiple second rotating shafts. The feeding system and the receiving system are located on the outer side wall of the furnace body along its width, and the laser emitter is positioned away from this side wall of the furnace body. The plane containing the multiple first rotating shafts and the plane containing the multiple second rotating shafts can both be horizontal planes, or they can both be parallel to the bottom wall of the furnace chamber.

[0014] Preferably, the furnace body has a window at the top, with the laser emitter's light source facing this window. A temperature detector and an image acquisition device are also installed on the window, all electrically connected to the control system. The window can be made of high-transparency quartz glass / high-transparency infrared optical window, and is connected to the furnace body via a flange. The image acquisition device can be a digital camera with a charge-coupled device image sensor, such as a CCD camera, primarily used to provide real-time feedback on whether the laser is focused on the carbon fiber bundle, as fiber movement can cause jitter. The image acquisition device feeds the results back to the control system in real time, which adjusts the waveform and position of the laser emitter based on the feedback data to ensure heating effectiveness. The temperature of the second heating zone is monitored in real time by the temperature detector and fed back to the control system, which adjusts the temperature by calculating and adjusting the power of the laser emitter. By adjusting the laser beam shaper to control the shape, size, and energy distribution of the output light spot, combined with the temperature detector and CCD located at the window, the heating temperature of the carbon fiber can be precisely controlled. For specific control methods, refer to the carbon fiber controllable laser-based high-temperature graphitization device disclosed in application number 2016111259790.

[0015] Based on the same inventive concept, this application also proposes a carbon fiber heat treatment process, which uses the continuous heat treatment equipment described above to heat treat carbon fibers. The carbon fibers run at a speed of 1 to 10 m / min in the furnace. The temperature of the carbon fibers is 1500 to 2300°C when they enter the laser emitter irradiation area through the first rotating shaft, and the temperature of the carbon fibers after passing through the laser emitter irradiation area reaches 2800°C or above.

[0016] When the carbon fiber enters the laser emitter irradiation area, the temperature is 1500–2300℃, with an optimal range of 2000–2300℃. This temperature significantly extends the lifespan of the heating electrode while reducing heating power consumption. The carbon fiber heat treatment process of this invention achieves a production efficiency of 5 m / min or higher.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The continuous heat treatment equipment of the present invention sets the electrodes and laser emitters in the same furnace body. After the carbon fiber enters the furnace body, it is first preheated by the electrodes and then heated by the laser at high temperature, forming a gradient temperature rise to avoid the core-skin problem. The carbon fiber temperature can reach 2800℃ and above, and it can avoid the carbon fiber from rapidly heating from room temperature to 2800℃, which would cause cracks. The carbon fiber has higher strength and modulus.

[0019] 2. The continuous heat treatment equipment of the present invention can control the temperature of the heating electrode at about 2300℃. The electrode life is longer at this temperature, which can reduce production costs.

[0020] 3. The continuous heat treatment equipment of the present invention uses laser heating, which has higher heat treatment efficiency and lower energy consumption.

[0021] 4. The continuous heat treatment equipment of the present invention has a simple structure and can be used not only for the heat treatment of carbon fiber, but also for the heat treatment of other continuous materials. It can be achieved simply by removing or adjusting the guide groove on the rotating shaft, and by adjusting the shape, size and layout of the laser emitter spot.

[0022] 5. The carbon fiber heat treatment process of the present invention has a production efficiency of 5 m / min or higher. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the continuous heat treatment equipment of the present invention;

[0024] Figure 2 yes Figure 1 Schematic diagram of the first rotating shaft structure;

[0025] Figure 3 yes Figure 1 Schematic diagram of the second rotating shaft structure;

[0026] Figure 4 yes Figure 1 A schematic diagram showing the distribution of the carbon fiber bundles on the first and second rotating shafts on the far right side of the furnace body.

[0027] In the figure

[0028] 1-Furnace body; 101-First opening; 2-Electrode; 3-Feeding system; 4-Receiving system; 5-First rotating shaft; 501-First guide groove; 6-Second rotating shaft; 601-Second guide groove; 7-Laser emitter; 8-Sealing system; 9-Window; 10-Temperature detector; 11-Image acquisition device; 12-Carbon fiber; 13-Insulation layer; 14-Third rotating shaft; 15-First heating zone; 16-Second heating zone. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0030] like Figure 1 As shown, this embodiment provides a continuous heat treatment device including a furnace body 1, multiple electrodes 2 disposed within the furnace body 1, a feeding system 3, and a receiving system 4. The furnace chamber of the furnace body 1 is equipped with an insulation layer 13, and the furnace interior is filled with an argon inert gas atmosphere (oxygen content ≤10ppm). One side of the furnace chamber of the furnace body 1 features a window design for convenient equipment maintenance and the feeding of carbon fiber 12. A first opening 101 is provided on the left side wall of the furnace body 1 along its width direction. This first opening 101 is sealed by a sealing system 8. Both the feeding system 3 and the receiving system 4 are located outside the first opening 101, with the receiving system 4 positioned above the feeding system 3. Eight first rotating shafts 5 and seven second rotating shafts 6 are disposed along the length direction inside the furnace body 1. The first rotating shafts 5 and second rotating shafts 6 are rotatably connected to the front and rear side walls of the furnace body 1 along its width direction, and all eight first rotating shafts 5 are positioned above the seven second rotating shafts 6. The eight first rotating shafts 5 are located on the same horizontal plane, which is above the first opening 101. Seven second rotating shafts 6 are also located on the same horizontal plane, and this horizontal plane can penetrate the first opening 101. Eight first rotating shafts 5 and seven second rotating shafts 6 are evenly spaced along the length of the furnace body 1. A third rotating shaft 14 is located below the leftmost first rotating shaft 5, positioned at the first opening 101 and above the second rotating shafts 6. The remaining seven first rotating shafts 5 and second rotating shafts 6 are vertically aligned. Seven electrodes 2 are located below the second rotating shafts 6 and between the first rotating shafts 5 and second rotating shafts 6. These seven electrodes 2 are evenly spaced along the length of the furnace body 1, with the upper seven electrodes 2 corresponding to the lower seven electrodes 2, and the electrodes 2 are staggered with the second rotating shafts 6. Four electrodes 2 are located on the upper right side of the first rotating shaft 5, their positions corresponding to the four electrodes 2 on the lower right side of the first rotating shaft 5. A window 9 is provided on the top wall of the furnace body 1. This window 9 is located between the first opening 101 and the first rotating shaft 5, which is furthest from the side wall containing the first opening 101. The window 9 is situated within the area surrounded by four electrodes 2 positioned above and to the right of the first rotating shaft 5. The window 9 also houses a laser emitter 7, a temperature detector 10, and an image acquisition device 11. All three are electrically connected to the control system. The image acquisition device 11 uses a CCD camera, and the temperature detector 10 uses an infrared pyrometer (suitable for 2000-3000℃), preferably a fiber optic infrared thermometer. Figure 2 He Ru Figure 3 As shown, a plurality of first guide grooves 501 are provided along the length direction of the first rotating shaft 5, and the first guide grooves 501 are arranged circumferentially along the first rotating shaft 5. A plurality of second guide grooves 601 are provided along the length direction of the second rotating shaft 6, and the second guide grooves 601 are arranged circumferentially along the second rotating shaft 6. Both the first guide grooves 501 and the second guide grooves 601 serve as material receiving grooves. The plurality of first guide grooves 501 are evenly spaced along the length direction of the first rotating shaft 5, and the plurality of second guide grooves 601 are evenly spaced along the length direction of the second rotating shaft 6. The width of the first guide groove 501 is equal to the distance between two adjacent second guide grooves 601, and the width of the second guide groove 601 is equal to the distance between two adjacent first guide grooves 501. The first guide grooves 501 and the second guide grooves 601 are staggered relative to each other, and the width of the first guide groove 501 is equal to the width of the second guide groove 601. Carbon fiber 12 enters the furnace body 1 through the feeding system 3 and the first opening 101. After passing around each of the second rotating shafts 6, carbon fiber 12 passes upward around each of the first rotating shafts 5. Finally, carbon fiber 12 enters the receiving system 4 through the first opening 101.

[0031] This embodiment also provides a carbon fiber heat treatment process, in which the carbon fiber 12 is heat treated using the continuous heat treatment equipment described above. The carbon fiber 12 runs at a speed of 1 to 10 m / min within the furnace body 1. The temperature of the carbon fiber 12 is 1500 to 2300°C when it enters the irradiation area of ​​the laser emitter 7, and the temperature of the carbon fiber 12 reaches 3000°C or higher after passing through the irradiation area of ​​the laser emitter 7.

[0032] In this embodiment of the continuous heat treatment equipment, carbon fiber 12 enters the furnace chamber of the furnace body 1 through the feeding system 3, the sealing system 8, and the first opening 101. The carbon fiber 12 is divided into multiple carbon fiber bundles by the second guide groove 601. Each carbon fiber bundle sequentially passes around the second guide groove 601 on each second rotating shaft 6 and then turns upwards to pass around the first guide groove 501 on each first rotating shaft 5. Finally, the carbon fiber bundles enter the receiving system 4 through the third rotating shaft 14, the first opening 101, and the sealing system 8. Multiple first rotating shafts 5 rotate in the same direction, and multiple second rotating shafts 6 rotate in the same direction. The feeding system 3, the second rotating shafts 6, the first rotating shafts 5, and the receiving system 4 constitute a traction system for heating the carbon fiber 12. The tension of the carbon fiber can be controlled by adjusting the speed difference between feeding and receiving. The electrode 2 can be made of high-purity graphite or other similar materials, and the carbon fiber bundles located around the first rotating shafts 5 and the second rotating shafts 6 are preheated by the electrode 2. Figure 1 As shown, electrodes 2 are provided on both the upper and lower sides of the second rotating shaft 6 located on the side of the first opening 101. This area is the first heating zone 15. Figure 1The dashed box in the diagram only indicates the first heating zone 15, which has two layers of heating electrodes 2. Electrodes 2 are provided on the upper and lower sides of the first rotating shaft 5 and the second rotating shaft 6 located on the side of the laser emitter 7. This area is the second heating zone 16. Figure 1 The dashed box in the diagram only indicates the second heating zone 16. This second heating zone 16 has three layers of heating electrodes 2, and a laser heating element is also located above it. After the carbon fiber bundle enters the furnace body 1, it is pulled into the first heating zone 15 by the second rotating shaft 6. The electrodes 2 located below the second rotating shaft 6 and between the second rotating shaft 6 and the first rotating shaft 5 preheat the upper and lower sides of the carbon fiber bundle, and the temperature of the carbon fiber bundle can reach about 2300℃ after preheating. When the carbon fiber bundle enters the second heating zone 16, the electrodes 2 located on the upper and lower sides of the second rotating shaft 6 below it heat the upper and lower sides of the carbon fiber bundle evenly. After the carbon fiber bundle turns upward and enters the first rotating shaft 5, the electrodes 2 located above the first rotating shaft 5 and between the second rotating shaft 6 and the first rotating shaft 5 heat the upper and lower sides of the carbon fiber bundle evenly. At the same time, the laser emitted by the laser emitter 7 rapidly heats the carbon fiber bundle located below the laser emitter 7. The temperature of the second heating zone 16 is controlled by the heating power of the laser emitter 7. Laser heating is highly efficient and energy-saving. By adjusting the shape, size, and energy distribution of the output light spot using the laser beam shaper, the carbon fiber 12 can be rapidly heated from the preheating temperature to the set heat treatment temperature, such as 3000℃ or higher. The image acquisition device 11 feeds the results back to the control system in real time. The control system adjusts the waveform and position of the laser emitter based on the feedback data to ensure the heating effect. The temperature of the second heating zone 16 is monitored in real time by the temperature detector 10 and fed back to the control system. The control system adjusts the temperature by calculating and adjusting the power of the laser emitter 7. By adjusting the shape, size, and energy distribution of the output light spot using the laser beam shaper, combined with the temperature detector 10 located at window 9 and the CCD camera, the heating temperature of the carbon fiber 12 can be precisely controlled. Figure 4 As shown, after setting the size and position of the first guide groove 501 and the second guide groove 601, when the carbon fiber bundle turns upward through the rightmost second rotating shaft 6 and enters the rightmost first rotating shaft 5, the carbon fiber bundle is guided into the first guide groove 501 by the second guide groove 601. Since the second guide groove 601 and the first guide groove 501 are relatively offset, the positions of the upper carbon fiber bundle and the lower carbon fiber bundle are relatively offset, and the lower carbon fiber bundle is located in the gap between the upper carbon fiber bundles. When the laser emitted by the laser emitter 7 heats the carbon fiber 12, the laser located in the gap between the upper carbon fiber bundles will irradiate the lower carbon fiber bundle, thus preventing the laser from leaking below the lower carbon fiber bundle and causing damage to the insulation layer 13 due to overheating.

[0033] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the present embodiments by those skilled in the art will fall within the scope defined by the appended claims.

Claims

1. A continuous heat treatment apparatus, comprising a furnace body (1), a feeding system (3), a receiving system (4), and multiple electrodes (2) disposed within the furnace body (1); characterized in that: The feeding system (3) and the receiving system (4) are both located on the same side wall of the furnace body (1), and a laser emitter (7) is provided on the top wall of the furnace body (1). The furnace body (1) is provided with multiple first rotating shafts (5) and multiple second rotating shafts (6). The first rotating shafts (5) and the second rotating shafts (6) are rotatably connected to the side wall of the furnace body (1). The surface formed by the multiple first rotating shafts (5) is located above the surface formed by the multiple second rotating shafts (6). The multiple first rotating shafts (5) rotate in the same direction, and the multiple second rotating shafts (6) rotate in the same direction. The light source of the laser emitter (7) is directed toward the surface formed by connecting multiple first rotating shafts (5), and multiple electrodes (2) are arranged around multiple second rotating shafts (6).

2. The continuous heat treatment equipment according to claim 1, characterized in that: The first rotating shaft (5) and the second rotating shaft (6) are both arranged along the width direction of the furnace body (1). The first rotating shaft (5) is provided with a plurality of first guide grooves (501) along the length direction. The first guide grooves (501) are arranged around the first rotating shaft (5). The second rotating shaft (6) is provided with a plurality of second guide grooves (601) along the length direction. The second guide grooves (601) are arranged around the second rotating shaft (6). The first guide grooves (501) and the second guide grooves (601) are both used as guide grooves when the carbon fiber (12) moves.

3. The continuous heat treatment equipment according to claim 2, characterized in that: The first guide groove (501) and the second guide groove (601) are arranged opposite to each other, and the projections of the first guide groove (501) and the second guide groove (601) on the bottom wall of the furnace body (1) are adjacent to each other.

4. The continuous heat treatment equipment according to claim 3, characterized in that: Multiple first guide grooves (501) are evenly spaced along the length of the first rotating shaft (5), and multiple second guide grooves (601) are evenly spaced along the length of the second rotating shaft (6); the width of the first guide groove (501) is equal to the distance between two adjacent second guide grooves (601), and the width of the second guide groove (601) is equal to the distance between two adjacent first guide grooves (501).

5. The continuous heat treatment equipment according to claim 1, characterized in that: Electrodes (2) are provided below the second rotating shaft (6), between the first rotating shaft (5) and the second rotating shaft (6), and above the first rotating shaft (5). The electrodes (2) above the first rotating shaft (5) are arranged around the irradiation area of ​​the laser emitter (7).

6. The continuous heat treatment equipment according to claim 5, characterized in that: The multiple electrodes (2) are evenly spaced along the length of the furnace body (1).

7. The continuous heat treatment equipment according to claim 1, characterized in that: Multiple first rotating shafts (5) and multiple second rotating shafts (6) are evenly spaced along the length of the furnace body (1). Multiple first rotating shafts (5) are located on the same plane, and multiple second rotating shafts (6) are also located on the same plane. The plane where multiple first rotating shafts (5) are located is parallel to the plane where multiple second rotating shafts (6) are located. The feeding system (3) and the receiving system (4) are located on the outer side wall of the furnace body (1) along the width direction. The laser emitter (7) is located away from the side wall of the furnace body (1).

8. The continuous heat treatment equipment according to claim 1, characterized in that: The furnace body (1) has a window (9) on the top, and the light source of the laser emitter (7) is directed toward the window (9). The window (9) is also equipped with a temperature detector (10) and an image acquisition device (11). The laser emitter (7), the temperature detector (10) and the image acquisition device (11) are all electrically connected to the control system.

9. A carbon fiber heat treatment process, characterized in that: The carbon fiber (12) is heat-treated using a continuous heat treatment equipment as described in any one of claims 1 to 8. The carbon fiber (12) runs at a speed of 1 to 10 m / min in the furnace body (1). The carbon fiber (12) is at a temperature of 1500 to 2300°C when it enters the irradiation area of ​​the laser emitter (7) via the first rotating shaft (5). After passing through the irradiation area of ​​the laser emitter (7), the temperature of the carbon fiber (12) reaches more than 2800°C.

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