Carbon fiber pre-oxidation tunnel furnace

Abstract

The utility model discloses a carbon fiber pre-oxidation tunnel furnace, which relates to the technical field of carbon fiber processing equipment, and comprises a shell, the front surface and the back surface of the shell are respectively provided with a feed port and a discharge port, two side walls of the feed port and the discharge port are fixedly connected with baffle plates, the middle part of the shell is provided with a transmission mesh belt, and the transmission mesh belt is provided with a plurality of baffle plates. The outer surface of the conveying net belt is fixedly connected with a plurality of heat conducting fins, a fixing plate is arranged in the middle of the inner side of the conveying net belt, an electric heater is installed at the bottom end of the fixing plate, a top cavity is formed in the top of the inner side of the shell, and a heat reflecting plate is fixedly installed at the top end of the inner side of the top cavity. By arranging a series of structures, fiber precursors are not prone to floating and stacking due to the fact that the fiber precursors are disturbed by hot air flow in the furnace, so that the fiber precursors are heated and oxidized easily, meanwhile, the conduction speed of heat in the furnace can be increased, energy consumption of the tunnel furnace is reduced, and the tunnel furnace is more energy-saving and environment-friendly.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon fiber processing equipment, specifically a carbon fiber pre-oxidation tunnel furnace. Background Technology

[0002] Carbon fiber pre-oxidation is an important step in the production and processing of carbon fiber. Its main purpose is to pre-treat the fiber filaments before carbonization. The pre-oxidation process involves many complex chemical reactions, which can transform the linear macromolecular chains in the fiber into heat-resistant trapezoidal structures, thereby improving the fiber's heat resistance and flame resistance.

[0003] Currently, carbon fiber pre-oxidation is typically carried out in heated air, requiring heating equipment such as tunnel furnaces. However, existing carbon fiber pre-oxidation tunnel furnaces usually lay short fiber filaments flat on the conveyor belt before they enter the furnace. Due to the light weight of the fiber filaments and the inability to stabilize them by applying tension, they tend to float and stack within the furnace when carried by the hot airflow, hindering the thermal oxidation of the fiber filaments. Furthermore, existing carbon fiber pre-oxidation tunnel furnaces typically use thermal radiation for heat conduction when heating the air, rather than hot air blowing. This results in slow heat transfer within the furnace and significant heat loss during the transfer process, requiring more heat energy to be generated to transfer to the fiber filaments, leading to high energy consumption during tunnel furnace operation. Utility Model Content

[0004] The purpose of this invention is to provide a carbon fiber pre-oxidation tunnel furnace to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a carbon fiber pre-oxidation tunnel furnace, comprising an outer shell, with an inlet and an outlet respectively provided on the front and back sides of the outer shell, baffles fixedly connected to both the inlet and outlet side walls, a conveyor belt installed in the middle of the outer shell, multiple heat-conducting plates fixedly connected to the outer surface of the conveyor belt, a fixing plate provided in the middle of the inner side of the conveyor belt, an electric heater installed at the bottom end of the fixing plate, a top cavity provided in the top of the inner side of the outer shell, a heat reflector plate fixedly installed at the top of the inner side of the top cavity, electric telescopic rods installed at the four corners of the bottom end of the heat reflector plate, a vertical plate fixedly connected to the output end of the electric telescopic rod, a rotating roller provided at the bottom of the vertical plate, a heat-conducting cable rotatably connected to the outer wall of the rotating roller, and a ventilation cavity provided in the bottom of the outer shell.

[0006] Preferably, a second gear is fixedly connected to one end of the shaft of one of the rollers, and the outer wall of the second gear meshes with the first gear.

[0007] Preferably, a rotary motor is installed in the middle of one of the vertical plates, and the first gear is fixedly connected to the output end of the rotary motor.

[0008] Preferably, the rotating roller is rotatably connected to the vertical plate via a first gear, and the heat-conducting tape is rotatably connected to the top cavity via the rotating roller.

[0009] Preferably, the fixing plate is slidably connected to the conveyor belt, and the fixing plate is located directly below the heat-conducting tape.

[0010] Preferably, the ventilation cavity is connected to the interior of the top cavity, and the feed inlet is connected to the discharge outlet through the top cavity.

[0011] Preferably, the heat-conducting tape is connected to the conveyor belt via an electrically operated telescopic rod.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This carbon fiber pre-oxidation tunnel furnace, through baffles, rotating rollers, heat conduction tape, vertical plates and electric telescopic rods, makes it difficult for the fiber filaments to be blown away and stacked by the external airflow when entering the tunnel furnace. This allows the fiber filaments to enter the tunnel furnace in a flat state. At the same time, the heat conduction tape and rotating rollers limit the fiber filaments by rotating and adhering to the top of the fiber filaments, making it difficult for the fiber filaments to be disturbed by the hot airflow in the furnace and to drift and stack. This is conducive to the heat oxidation of the fiber filaments.

[0014] 2. This carbon fiber pre-oxidation tunnel furnace, through heat reflectors, heat-conducting plates, fixing plates, and ventilation chambers, allows hot air inside the tunnel furnace to float upwards from the middle of the conveyor belt. Under the action of air blown into the ventilation chambers, the heat moves towards the heat reflectors. Then, the heat is reflected by the heat reflectors to the surface of the rotating heat-conducting plates, allowing the heat to be transferred to the carbon fiber bidirectionally through the heat-conducting plates and fixing plates. This accelerates the heat conduction speed inside the furnace, reduces the energy consumption of the tunnel furnace, and is more energy-efficient and environmentally friendly. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the baffle and fixing plate structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the heat reflector and top cavity structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the electric telescopic rod and the heat conduction cable structure of this utility model.

[0019] In the diagram: 1. Outer shell; 2. Feed inlet; 3. Conveyor belt; 4. Heat-conducting plate; 5. Baffle; 6. Heat reflector; 7. Electric telescopic rod; 8. Vertical plate; 9. First gear; 10. Second gear; 11. Rotary roller; 12. Heat-conducting tape; 13. Fixing plate; 14. Electric heater; 15. Discharge port; 16. Rotary motor; 17. Top cavity; 18. Ventilation cavity. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figures 1 to 4As shown, the carbon fiber pre-oxidation tunnel furnace of this embodiment includes an outer shell 1. The front and back of the outer shell 1 are respectively provided with a feed inlet 2 and a discharge outlet 15. Baffles 5 are fixedly connected to both side walls of the feed inlet 2 and the discharge outlet 15. A conveyor belt 3 is installed in the middle of the outer shell 1. Multiple heat-conducting plates 4 are fixedly connected to the outer surface of the conveyor belt 3. A fixing plate 13 is provided in the middle of the inner side of the conveyor belt 3. An electric heater 14 is installed at the bottom end of the fixing plate 13. A top cavity 17 is opened in the top of the inner side of the outer shell 1. A heat reflector plate 6 is fixedly installed in the top of the inner side of the top cavity 17. Electric telescopic rods 7 are installed at the four corners of the bottom end of the heat reflector plate 6. A vertical plate 8 is fixedly connected to the output end of the electric telescopic rod 7. A rotating roller 11 is provided at the bottom of the vertical plate 8. A heat-conducting cable 12 is rotatably connected to the outer wall of the rotating roller 11. A ventilation cavity 18 is opened in the bottom of the outer shell 1.

[0024] Specifically, the inner wall of the outer shell 1 is coated with a heat-insulating and anti-corrosion coating, making it difficult for heat to dissipate through the outer shell 1. This facilitates the heat reflector plate 6 to reflect the heat from the top inner side of the outer shell 1 to the heat conduction tape 12, thereby reducing heat loss. The inlet 2 and outlet 15 are the same size, and the height of the baffle 5 is the same as that of the inlet 2 and outlet 15. This can block the airflow blowing from the side towards the conveyor belt 3 in front of the inlet 2 and outlet 15, thus helping the fiber filaments to enter the outer shell 1 in a flat state. The function of the heat conduction plate 4 is to allow the heat from the electric heater 14 to be quickly transferred to the fiber filaments, while blocking the airflow blowing upward from the ventilation cavity 18, allowing the fiber filaments to remain flat. The surface of the conveyor belt 3 has several mesh holes, allowing heat to quickly penetrate the belt and enter the top cavity 17. The fixing plate 13 is similarly... Made of thermally conductive material, it enables rapid heat conduction to the heat-conducting sheet 4 on the conveyor belt 3, thereby accelerating the heat conduction speed. The function of the heat reflector 6 is to reflect the heat accumulated at the top of the top cavity 17 to the surface of the heat conduction tape 12, thus facilitating the heat absorption of the heat conduction tape 12. The function of the electric telescopic rod 7 is to adjust the height of the vertical plate 8, so that the vertical plate 8 can drive the distance between the heat conduction tape 12 and the conveyor belt 3 to change, thereby achieving the bonding and positioning of the fiber filaments on the conveyor belt 3, which is more conducive to the heat oxidation of the fiber filaments. The function of the rotating roller 11 is to realize the rotation of the heat conduction tape 12 above the conveyor belt 3, thereby facilitating the continuous transfer of heat from the heat conduction tape 12 to the fiber filaments on the conveyor belt 3. The function of the ventilation cavity 18 is to facilitate the introduction of air into the tunnel furnace, so that the fiber filaments can be oxidized in sufficient oxygen.

[0025] Furthermore, a second gear 10 is fixedly connected to one end of the shaft of one of the rotating rollers 11. A first gear 9 meshes with the outer wall of the second gear 10. The first gear 9 can mesh with the second gear 10 to rotate, causing the rotating roller 11 to rotate and drive the heat conduction tape 12 to rotate. This allows the heat conduction tape 12 to continuously adhere to the fiber filaments on the conveyor belt 3, which is beneficial for limiting the fiber filaments and accelerating the heating speed of the fiber filaments.

[0026] Furthermore, a rotary motor 16 is installed in the middle of one of the vertical plates 8. The first gear 9 is fixedly connected to the output end of the rotary motor 16. After the rotary motor 16 is powered on, it can drive the first gear 9 to rotate, thereby realizing the meshing and rotation of the first gear 9 with the second gear 10.

[0027] Furthermore, the rotating roller 11 is rotatably connected to the vertical plate 8 via the first gear 9, and the heat conduction tape 12 is rotatably connected to the top cavity 17 via the rotating roller 11. The rotation of the second gear 10 enables one of the rotating rollers 11 to rotate on the vertical plate 8, thereby realizing the rotation of the heat conduction tape 12 and the other rotating roller 11, which facilitates the rotation of the heat conduction tape 12 in contact with the carbon fiber filament.

[0028] Furthermore, the fixing plate 13 is slidably connected to the conveyor belt 3. The fixing plate 13 is located directly below the heat conduction tape 12. The function of the fixing plate 13 is to support the conveyor belt 3 and support the downward-pressed heat conduction tape 12, so that the heat conduction tape 12 can better fit with the fiber filament, thereby achieving the limitation of the fiber filament.

[0029] Furthermore, the ventilation cavity 18 is connected to the interior of the top cavity 17, and the feed inlet 2 is connected to the discharge outlet 15 through the top cavity 17. The function of the ventilation cavity 18 is to allow sufficient air to be introduced into the tunnel furnace, and at the same time, to allow the heat in the tunnel furnace to rise rapidly into the top cavity 17, thereby accelerating the movement of heat towards the heat reflector plate 6.

[0030] Furthermore, the heat conduction cable 12 is movably connected to the conveyor belt 3 via an electric telescopic rod 7. After the electric telescopic rod 7 is started, it can adjust the distance between the heat conduction cable 12 and the conveyor belt 3, thereby facilitating the heat conduction cable 12 to better adhere to the fiber filaments on the conveyor belt 3.

[0031] The method of use in this embodiment is as follows: Before using this carbon fiber pre-oxidation tunnel furnace, the furnace needs to be powered on. Then, the raw fibers to be oxidized are laid flat on the heat-conducting plates 4 of the conveyor belt 3. Since the heat-conducting plates 4 are arranged at equal intervals on the surface of the conveyor belt 3, the raw fibers can enter the tunnel furnace sequentially from the heat-conducting plates 4. Then, the conveyor belt 3 will carry the raw fibers into the outer shell 1. At the same time, the rotary motor 16 can be started to drive the first gear 9 to rotate, so that the first gear 9 meshes with the second gear 10 to rotate, driving the roller 11 to rotate on the vertical plate 8, and driving the heat-conducting tape 12 on the outer side of the roller 11 to rotate. Then, the electric motor can be controlled. The raising and lowering of the telescopic rod 7 causes the electric telescopic rod 7 to move the conductive heating tape 12 to the top of the conveyor belt 3, so that the conductive heating tape 12 can limit the fiber filaments on the heat-conducting plate 4. At the same time, the ventilation cavity 18 will continuously introduce air. Then, the electric heater 14 in the middle of the conveyor belt 3 will be activated. Some of the heat will be directly conducted to the fixed plate 13, while the remaining heat will pass through the mesh between the heat-conducting plates 4 and enter the top cavity 17. After being reflected by the heat reflector plate 6 at the top of the top cavity 17, it will radiate to the surface of the conductive heating tape 12, so that the fiber filaments can absorb heat from the bottom and the top at the same time, so that the fiber filaments can be fully heated and oxidized, and at the same time, the heat conduction speed in the furnace will be accelerated.

[0032] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A carbon fiber pre-oxidation tunnel furnace comprising an outer shell (1), characterized in that: The front and back of the shell (1) are provided with an inlet (2) and an outlet (15), respectively, both sides of the inlet (2) and the outlet (15) are fixedly connected with a baffle (5), the middle of the shell (1) is provided with a conveying mesh belt (3), the outer surface of the conveying mesh belt (3) is fixedly connected with a plurality of heat conduction fins (4), the middle of the inner side of the conveying mesh belt (3) is provided with a fixed plate (13), the bottom end of the fixed plate (13) is provided with an electric heater (14), the top of the inner side of the shell (1) is provided with a top cavity (17), the top end of the inner side of the top cavity (17) is fixedly provided with a heat reflecting plate (6), the bottom end of the heat reflecting plate (6) is provided with an electric telescopic rod (7), the output end of the electric telescopic rod (7) is fixedly connected with a vertical plate (8), the bottom of the vertical plate (8) is provided with a rotating roller (11), the outer wall of the rotating roller (11) is rotatably connected with a heat conducting belt (12), the bottom of the shell (1) is provided with a ventilation cavity (18).

2. The carbon fiber pre-oxidation tunnel furnace according to claim 1, characterized in that: One of the rotating rollers (11) is fixedly connected with a second gear (10) at one end, and the outer wall of the second gear (10) is engaged with a first gear (9).

3. The carbon fiber pre-oxidation tunnel furnace according to claim 2, characterized in that: One of the vertical plates (8) is provided with a rotating motor (16) at the middle, and the first gear (9) is fixedly connected with the output end of the rotating motor (16).

4. The carbon fiber pre-oxidation tunnel furnace according to claim 3, characterized in that: The rotating roller (11) is rotatably connected with the vertical plate (8) through the first gear (9), and the heat conducting belt (12) is rotatably connected with the top cavity (17) through the rotating roller (11).

5. The carbon fiber pre-oxidation tunnel furnace according to claim 1, characterized in that: The fixed plate (13) is slidably connected with the conveying mesh belt (3), and the fixed plate (13) is located directly below the heat conducting belt (12).

6. The carbon fiber pre-oxidation tunnel furnace according to claim 1, characterized in that: The ventilation cavity (18) is communicated with the inside of the top cavity (17), and the inlet (2) is communicated with the outlet (15) through the top cavity (17).

7. The carbon fiber pre-oxidation tunnel furnace according to claim 1, characterized in that: The heat conducting belt (12) is movably connected with the conveying mesh belt (3) through the electric telescopic rod (7).

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