Dipping and drying production line for preparing fuel cell carbon paper

Abstract

According to the dipping and drying production line for preparing the carbon paper of the fuel cell, the structure of the production line is improved, so that the dipping and drying efficiency of the carbon paper is remarkably improved. The dipping and drying production line for preparing the fuel cell carbon paper comprises a first dipping and drying sub-line and a second dipping and drying sub-line, wherein the tail end of the first dipping and drying sub-line is connected with the head end of the second dipping and drying sub-line to form the continuous dipping and drying production line. According to the technical scheme, the first dipping and drying sub-line and the second dipping and drying sub-line are connected in series, so that the processing efficiency of the dipping and drying production line can be remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of carbon paper preparation technology, specifically to an impregnation and drying production line for preparing carbon paper for fuel cells. Background Technology

[0002] With the transformation of the global energy structure and increasingly stringent environmental protection requirements, hydrogen fuel cells, as a highly efficient and clean energy conversion device, are receiving increasing attention and research investment. Carbon paper, as a key component of hydrogen fuel cells, plays a crucial role in transmitting water vapor, electrons, and heat, and its performance directly affects the overall efficiency and stability of the fuel cell. The preparation process of carbon paper is complex and delicate, involving multiple steps and strict process control. Among these, impregnation and drying are key steps in the carbon paper preparation process, and improving the efficiency of impregnation and drying has been a continuous pursuit for those skilled in the art. Utility Model Content

[0003] The purpose of this invention is to provide an impregnation and drying production line for the preparation of carbon paper for fuel cells. By improving the structure of the production line, the efficiency of carbon paper impregnation and drying is significantly improved.

[0004] To achieve the above objectives, this utility model provides an impregnation and drying production line for the preparation of carbon paper for fuel cells. The impregnation and drying production line for the preparation of carbon paper for fuel cells includes a first impregnation and drying sub-line and a second impregnation and drying sub-line. The end of the first impregnation and drying sub-line is connected to the beginning of the second impregnation and drying sub-line to form a continuous impregnation and drying production line.

[0005] By adopting the technical solution in this application, the first impregnation and drying sub-line and the second impregnation and drying sub-line are connected in series, thereby significantly improving the processing efficiency of the impregnation and drying production line.

[0006] Optionally, each of the impregnation and drying sub-lines includes an impregnation unit and a drying unit; in the extending direction of each of the impregnation and drying sub-lines, the drying unit is located downstream of the impregnation unit.

[0007] This integrates the impregnation unit and the drying unit into one, enabling continuous impregnation and drying of carbon paper.

[0008] Optionally, the impregnation unit includes an impregnation tank, two support rollers, and a redirecting roller disposed between the two support rollers, the impregnation tank forming a solution space; the upper surfaces of the two support rollers are used to support carbon paper, and the lower surface of the redirecting roller is used to support carbon paper; the redirecting roller is located within the solution space, and the highest point of the two support rollers is higher than the impregnation tank.

[0009] By setting up support rollers, the carbon paper can be prevented from rubbing against the immersion tank during the conveying process. At the same time, by setting up deflector rollers, the carbon paper immersed in the solution space can be guided and supported.

[0010] Optionally, the impregnation unit further includes a squeezing roller assembly, which is located downstream of the redirecting roller and outside the solution space in the direction of carbon paper movement; the squeezing roller assembly includes two pressure rollers arranged radially opposite to each other, with the carbon paper passing between the two pressure rollers; the two pressure rollers rotate in opposite directions.

[0011] By setting up a set of extrusion rollers, the impregnated carbon paper can be squeezed to remove excess liquid, and at the same time, it can also be used to transport the carbon paper and prevent it from being torn.

[0012] Optionally, the extrusion roller assembly further includes a drive unit, with one of the pressure rollers connected to the output end of the drive unit. The pressure roller connected to the drive unit thus enables the extrusion roller assembly to feed the carbon paper.

[0013] Optionally, each of the impregnation and drying sub-lines further includes a conveyor belt and roller assembly for conveying carbon paper. The roller assembly includes a drive roller and a redirecting roller. The conveyor belt is arranged around the roller assembly and rotates. The linear velocity of the drive roller is the same as that of the pressure roller. This ensures that the conveying speed of the carbon paper is consistent, preventing the carbon paper from being torn.

[0014] Optionally, the drying unit includes a drying chamber extending in the same direction as the conveyor belt. The drying chamber is used to fix the heating element, and the conveyor belt located on the upper side can pass through the drying chamber. Thus, the carbon paper, after undergoing one impregnation operation, can be dried as it moves to the second impregnation and drying sub-line, further improving the impregnation and drying efficiency.

[0015] Optionally, the first impregnation and drying sub-line and the second impregnation and drying sub-line are distributed longitudinally, with the first impregnation and drying sub-line located below the second impregnation and drying sub-line; the impregnation and drying production line for preparing carbon paper for fuel cells further includes a first transition roller and a second transition roller arranged longitudinally; the lowest point of the first transition roller is on the same plane as the highest point of the roller assembly of the first impregnation and drying sub-line; the highest point of the second transition roller is on the same plane as the first support roller and the second support roller of the second impregnation and drying sub-line.

[0016] This allows for the support and protection of the carbon paper during its movement.

[0017] Optionally, the first transition roller and the second transition roller have the same radial dimension and are aligned longitudinally. This reduces the footprint of the impregnation and drying production line.

[0018] Optionally, a second tension detection device is provided between the second transition roller and the impregnation unit of the second impregnation and drying sub-line. By providing the second tension detection device, the tension on the carbon paper entering the second impregnation and drying sub-line can be detected.

[0019] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0021] Figure 1 This is a schematic diagram of the impregnation and drying production line for preparing carbon paper for fuel cells in this embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0023] Figure label:

[0024] Ⅰ-First impregnation and drying sub-line; Ⅱ-Second impregnation and drying sub-line;

[0025] 1-Unwinding shaft; 2-Carbon paper; 3.1-First idler roller; 3.2-First support roller; 3.3-Redirecting roller; 3.4-Second support roller; 3.5-First transition roller; 3.6-Second transition roller; 3.7-Second idler roller; 3.8-Solution space; 4.1-First tensile force detection device; 4.2-Second tensile force detection device; 4.3-Third tensile force detection device; 5-Immersion tank; 6.1-First liquid level sensor; 6.2-Second liquid level sensor; 7-First return port; 8.1-First filter; 8.2-Second filter; 9.1-First pump; 9.2-Second pump;

[0026] 10.1-First solenoid valve; 10.2-Second solenoid valve; 11-Second return port; 12-Ultrasonic vibrator; 13-Extrusion roller assembly; 14-Addition port; 15-Immersion tank; 16-Agitator; 17-Outlet; 18-Redirecting roller; 19.1-First air inlet; 19.2-Second air inlet;

[0027] 20-Condensation recovery device; 21-Exhaust fan; 22-Exhaust port; 23-Oven; 24.1-First heating element; 24.2-Second heating element; 25.1-First alignment device; 25.2-Second alignment device; 25.3-Third alignment device; 26-Material belt; 27-Drive roller; 28-Rewinding shaft. Detailed Implementation

[0028] This invention provides an impregnation and drying production line for the preparation of carbon paper for fuel cells. By improving the structure of the production line, the efficiency of carbon paper impregnation and drying is significantly improved.

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0031] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the impregnation and drying production line for preparing carbon paper for fuel cells in this embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0032] like Figure 1 and Figure 2 As shown, this utility model provides an impregnation and drying production line for preparing carbon paper 2 for fuel cells. The impregnation and drying production line includes a first impregnation and drying sub-line I and a second impregnation and drying sub-line II. The first impregnation and drying sub-line I and the second impregnation and drying sub-line II have identical structures, each including an impregnation unit and a drying unit. In the transport direction of the carbon paper 2, the impregnation units and drying units of each impregnation and drying sub-line are distributed sequentially from front to back. The end of the first impregnation and drying sub-line I is connected to the beginning of the second impregnation and drying sub-line II to form a continuous impregnation and drying production line.

[0033] Specifically, the first impregnation and drying sub-line I is used to impregnate and dry the carbon paper 2 once, and the second impregnation and drying sub-line II is used to impregnate and dry the carbon paper 2 a second time. In this embodiment, the impregnation and drying production line has a take-up shaft 28 and an unwind shaft 1 for holding the roll of carbon paper 2. The unwind shaft 1 is located on the feeding side of the impregnation and drying production line, and the take-up shaft 28 is located on the unloading side of the impregnation and drying production line. After the carbon paper 2 enters the impregnation and drying production line via the unwind shaft 1, it will pass through the first impregnation and drying sub-line I and the second impregnation and drying sub-line II in sequence before leaving the impregnation and drying production line via the take-up shaft 28. During this process, the carbon paper 2 is always located on the impregnation and drying production line.

[0034] By adopting the technical solution in this application, the first impregnation and drying sub-line I and the second impregnation and drying sub-line II are connected in series, thereby significantly improving the processing efficiency of the impregnation and drying production line.

[0035] Optionally, each of the impregnation and drying sub-lines includes an impregnation unit, a drying unit, and a conveying unit. The conveying unit is used to transport the carbon paper 2. In the extending direction of each impregnation and drying sub-line, the drying unit is located downstream of the impregnation unit. This integrates the impregnation unit and the drying unit into one, enabling continuous impregnation and drying of the carbon paper 2. The first impregnation and drying sub-line I includes a first impregnation unit, a first drying unit, and a first conveying unit; the second impregnation and drying sub-line II includes a second impregnation unit, a second drying unit, and a second conveying unit.

[0036] The specific structure of the impregnation unit is described below. The structure of the first impregnation unit and the second impregnation unit is the same. Here, only the first impregnation unit is used as an example for explanation.

[0037] The first impregnation unit includes an impregnation tank 5 and an impregnation vessel 15. The impregnation unit consists of two parts: the impregnation vessel 15 and the impregnation tank 5. The impregnation vessel 15 is used to hold the resin solution, and its top is equipped with a second liquid level sensor 6.2, a liquid inlet 14, a stirrer 16, and a first return port 7. The second liquid level sensor 6.2 monitors the liquid level in the vessel in real time and replenishes the solution accordingly. The stirrer 16 is used to agitate the solution in the vessel in real time. Especially to enhance the conductivity of the carbon paper 2, carbon black powder or graphite powder is often added to the solution. To ensure uniform dispersion of the carbon black powder in the solution, stirring is required during production to prevent sedimentation.

[0038] The bottom of the immersion tank 15 is provided with a liquid outlet 17, which is connected in sequence to the second solenoid valve 10.2, the second pump 9.2, and the second filter 8.2. By controlling the second solenoid valve 10.2 and the second pump 9.2, the connection and disconnection between the immersion tank 15 and the immersion tank 5 can be realized. In this embodiment, the immersion tank 15 injects liquid into the immersion tank 5 in real time so that the solution in the immersion tank 5 always maintains the set capacity.

[0039] The impregnation tank 5 is used to impregnate the carbon paper 2. In the example shown in the figure, the longitudinal cross-section of the impregnation tank 5 is similar to an inverted triangle structure, wider at the top and narrower at the bottom. The impregnation tank 5 encloses a solution space 3.8 to contain the impregnation solution.

[0040] Specifically, the first impregnation unit is used to impregnate the carbon paper 2 with a phenolic resin solution to reinforce it, and the second impregnation unit is used to impregnate the carbon paper 2 with a PVB resin solution to toughen it. By adopting the method of this application, the production efficiency of the carbon paper 2 is high. After high-temperature carbonization treatment, it has been proven that the carbon paper 2 has reduced brittleness and increased flexibility, and can achieve continuous and stable winding.

[0041] In the aforementioned technical solution, in order to ensure the conveying stability of the carbon paper 2 in the impregnation unit, the impregnation unit has two support rollers and a redirecting roller 3.3 disposed between the two support rollers. The upper surface of the two support rollers is used to support the carbon paper 2, and the lower surface of the redirecting roller 3.3 is used to support the carbon paper 2. The redirecting roller 3.3 is located in the solution space 3.8, and the highest point of the two support rollers is higher than the impregnation tank 5.

[0042] The two support rollers are at the same height, and the redirecting roller 3.3 is lower than the two support rollers in the longitudinal direction. The redirecting roller 3.3 can also be located at the midpoint of the two support rollers in the horizontal direction, thus forming the three vertices of an isosceles triangle. The two support rollers are arranged forward and backward along the conveying direction of the carbon paper 2.

[0043] The support roller located on the front side is defined as the first support roller 3.2, and the support roller located on the rear side is defined as the second support roller 3.4. Compared with the first support roller 3.2, the second support roller 3.4 is closer to the baking unit, and compared with the second support roller 3.4, the first support roller 3.2 is closer to the unwinding shaft 1.

[0044] By setting up support rollers, the carbon paper 2 can be prevented from rubbing against the immersion tank 5 during the conveying process. At the same time, by setting up deflector rollers 3.3, the carbon paper 2 located in the solution space 3.8 can be guided and supported.

[0045] In some other technical solutions of this application, the impregnation unit also includes a squeezing roller group 13, which is located downstream of the redirecting roller 3.3 and outside the solution space 3.8 in the moving direction of the carbon paper 2; the squeezing roller group 13 includes two pressure rollers, which are arranged radially opposite to each other, and the carbon paper 2 passes between the two pressure rollers; the two pressure rollers rotate in opposite directions.

[0046] Specifically, a pair of squeeze roller groups 13 are arranged between the second support roller 3.4 and the redirecting roller 3.3, and the squeeze roller groups 13 are not submerged in the solution. A first liquid level sensor 6.1 is arranged on one side of the impregnation tank 5. The liquid level in the tank is controlled in real time by interlocking the first liquid level sensor 6.1 and the second pump 9.2, so that the liquid level is maintained above the redirecting roller 3.3 and below the squeeze roller group 13. By setting the squeeze roller group 13, the impregnated carbon paper 2 can be squeezed to remove excess liquid, and at the same time, it can also transport the carbon paper 2 to prevent it from being torn.

[0047] In the aforementioned technical solution, the extrusion roller group 13 further includes a drive unit, which can be a servo motor. One of the pressure rollers is connected to the output end of the drive unit to drive the extrusion roller group 13 to operate actively. The gap and pressure between the two rollers of the extrusion roller group 13 are adjustable. During operation, the extrusion roller group 13 drags the carbon paper 2 through the impregnation liquid on one hand, and squeezes off excess impregnation liquid on the other. A second return port 11 is provided at the bottom of the impregnation tank 5, and the second return port 11 is connected in sequence to the first solenoid valve 10.1, the first pump 9.1, the first filter 8.1, and the first return port 7 at the top of the impregnation cylinder 15. The pressure roller is connected to the drive unit, thereby realizing the conveying of the carbon paper 2 by the extrusion roller group 13.

[0048] After the operation is completed, the excess impregnation solution in the tank is pumped back into the impregnation tank 15. An ultrasonic vibrator 12 is horizontally installed at the upper end of the second return port 11 in the impregnation tank 5 to vibrate the solution in the tank in real time and prevent carbon black powder from depositing in the solution.

[0049] In the aforementioned embodiments, each impregnation and drying sub-line further includes a conveyor belt 26 and a roller assembly for conveying the carbon paper 2. Both the conveyor belt 26 and the roller assembly belong to the conveying unit. The roller assembly includes a drive roller 27 and a redirecting roller 18. The conveyor belt 26 is arranged around the roller assembly and rotates. The linear velocity of the drive roller 27 is the same as that of the pressure roller. The unwinding shaft 1, the drive roller 27, and the rewinding shaft 28 are driven by servo motors. This ensures that the conveying speed of the carbon paper 2 is consistent, preventing the carbon paper 2 from being torn.

[0050] In the example shown, the drying unit includes an oven 23 extending in the same direction as the conveyor belt 26. A drive roller 27 and a redirecting roller 18 are respectively positioned at the outlet and inlet ends of the oven 23. The oven 23 is used to fix the heating element, and the conveyor belt 26, located on the upper side, can pass through the oven 23. The function of the conveyor belt 26 is to support the impregnated carbon paper 2 as it passes through the oven 23, drying and separating the carbon paper 2. The conveyor belt 26 has the following characteristics: high temperature resistance (not lower than 200℃), tensile strength (tensile strength not lower than 600 N / cm), smooth and non-stick surface, ring structure, flat joint, and made of polytetrafluoroethylene (PTFE).

[0051] Therefore, after one impregnation operation, the carbon paper 2 can be dried as it moves to the second impregnation and drying sub-line II, further improving the impregnation and drying efficiency.

[0052] In the aforementioned technical solution, the oven 23 extends in the same direction as the conveyor belt 26. The oven 23 is located downstream of the filtration device and covers the conveyor belt 26 located above it. Air inlets are provided at the front and rear ends of the oven 23 in the transmission direction, namely a first air inlet 19.1 and a second air inlet 19.2, respectively. An exhaust port 22 is provided at the top of the oven 23. The exhaust port 22 is connected to the air inlet side of the exhaust fan 21, and the air outlet side of the exhaust fan 21 is connected to the condensation recovery device 20. The airflow of the exhaust fan 21 is controllable, enabling it to promptly remove the water and alcohol vapor generated during the baking process. The condensation recovery device 20 is used to recover the water and alcohol vapor.

[0053] A first heating element 24.1 and a second heating element 24.2 are provided inside the drying oven 23. The first heating element 24.1 is located on the upper side of the conveyor belt 26, and the second heating element 24.2 is located on the lower side of the conveyor belt 26. The first heating element 24.1 can be an infrared lamp tube directly or indirectly fixedly connected inside the drying oven 23, and the second heating element 24.2 is a heating plate that can be attached to the lower surface of the conveyor belt 26. The heating plate can be a cast aluminum heating plate. This not only supports the conveyor belt 26 but also improves the drying efficiency of the wet fibers on the upper part of the conveyor belt 26.

[0054] In the example shown, the first heating element 24.1 is spaced apart along the conveying direction, and when the second heating element 24.2 is a heating plate, several heating plates are connected sequentially along the conveying direction. The temperature of each heating element is independently controllable. By adjusting the temperature of each group of heating elements through gradient adjustment, the carbon fiber mesh is dried into paper quickly and efficiently.

[0055] In the aforementioned embodiments, a first tension detection device 4.1 is provided on the side where the unwinding shaft 1 is located, and a first alignment device 25.1 is provided on the side of the redirecting roller 18. A second tension detection device 4.2 and a second alignment device 25.2 are also provided at the beginning of the second impregnation and drying sub-line II. A third alignment device 25.3 and a third tension detection device 4.3 are also provided on the side of the take-up shaft 28. Each alignment device is used to ensure that the material belt 26 runs straight and that the carbon paper 2 is wound neatly.

[0056] In the embodiment shown in the figure, to reduce the footprint of the impregnation and drying production line, the first impregnation and drying sub-line I and the second impregnation and drying sub-line II are distributed longitudinally, with the first impregnation and drying sub-line I located below the second impregnation and drying sub-line II. The impregnation and drying production line for preparing fuel cell carbon paper 2 also includes a first transition roller 3.5 and a second transition roller 3.6 arranged longitudinally. The lowest point of the first transition roller 3.5 is on the same plane as the highest point of the roller assembly of the first impregnation and drying sub-line I. The highest point of the second transition roller 3.6 is on the same plane as the first support roller 3.2 and the second support roller 3.4 of the second impregnation and drying sub-line II. Thus, the carbon paper 2 can be supported and protected during its movement. Furthermore, in the example shown in the figure, a first support roller 3.1 is provided at the position where the unwinding shaft 1 connects to the beginning of the first impregnation and drying sub-line I, and a second support roller 3.7 is also provided at the end of the second impregnation and drying sub-line II where it connects to the take-up shaft 28 to further support the carbon paper 2.

[0057] For example, the first transition roller 3.5 and the second transition roller 3.6 have the same radial dimension and are aligned longitudinally. This reduces the footprint of the impregnation and drying production line. A second tension detection device 4.2 is provided between the second transition roller 3.6 and the impregnation unit of the second impregnation and drying sub-line II. By providing the second tension detection device 4.2, the tension on the carbon paper 2 entering the second impregnation and drying sub-line II can be detected.

[0058] As a specific implementation method, the impregnation and drying production line uses the set operating speed of the first impregnation and drying sub-line I as the base speed. The second impregnation and drying sub-line II, the unwinding shaft 1, and the winding shaft 28 are all interlocked with each tension detection device and use torque closed-loop control for synchronous following operation. That is, when the tension detection device detects that the tension of the carbon paper 2 exceeds the set range, the servo motor interlocked with it automatically decelerates to reduce the tension of the carbon paper 2 to the set range to avoid breaking the carbon paper 2 due to excessive tension; when the tension of the carbon paper 2 is detected to be below the set range, the servo motor interlocked with it automatically accelerates to restore the tension of the carbon paper 2 to the set range to prevent the carbon paper 2 from becoming loose and misaligned, or from being unevenly wound.

[0059] In the specific operation process, carbon ropes are first strung from one end of the impregnation and drying production line to the other to pull the carbon paper 2, with the ends of the carbon ropes connected to the beginning of the carbon paper 2; the two drying chambers are preheated to the required temperature, and the impregnation liquid in the two impregnation tanks 5 is added to the set positions; after setting the running speed of the conveyor belt 26, the production line is started to begin impregnation and drying production. Finally, after production is completed, the impregnation liquid is recovered, and the production line is shut down.

[0060] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An impregnation and drying production line for preparing carbon paper for fuel cells, characterized in that, It includes a first impregnation and drying sub-line (Ⅰ) and a second impregnation and drying sub-line (Ⅱ), wherein the end of the first impregnation and drying sub-line (Ⅰ) is connected to the beginning of the second impregnation and drying sub-line (Ⅱ) to form a continuous impregnation and drying production line.

2. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 1, characterized in that, Each of the impregnation and drying sub-lines includes an impregnation unit and a drying unit; in the extending direction of each of the impregnation and drying sub-lines, the drying unit is located downstream of the impregnation unit.

3. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 2, characterized in that, The impregnation unit includes an impregnation tank (5), two support rollers, and a redirecting roller (3.3) disposed between the two support rollers. The impregnation tank (5) encloses a solution space. The upper surfaces of the two support rollers are used to support the carbon paper (2), and the lower surface of the redirecting roller (3.3) is used to support the carbon paper (2); the redirecting roller (3.3) is located in the solution space, and the highest point of the two support rollers is higher than the impregnation tank (5).

4. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 3, characterized in that, The impregnation unit also includes a squeezing roller group (13), which is located downstream of the redirecting roller (3.3) and outside the solution space (3.8) in the moving direction of the carbon paper (2). The extrusion roller assembly (13) includes two pressure rollers arranged radially opposite each other, with carbon paper (2) passing between the two pressure rollers; the two pressure rollers rotate in opposite directions.

5. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 4, characterized in that, The extrusion roller assembly (13) also includes a drive unit, and one of the extrusion rollers is connected to the output end of the drive unit.

6. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 5, characterized in that, Each of the impregnation and drying sub-lines also includes a material belt (26) for conveying carbon paper (2) and a roller assembly, the roller assembly including a drive roller (27) and a redirecting roller (18), the material belt (26) being arranged around the roller assembly and forming a rotation; the drive roller (27) having the same linear velocity as the pressure roller.

7. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 6, characterized in that, The drying unit includes an oven (23) extending in the same direction as the feed belt (26), the oven (23) being used to fix the heating element, and the feed belt (26) located on the upper side being able to pass through the oven (23).

8. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 6, characterized in that, The first impregnation and drying sub-line (Ⅰ) and the second impregnation and drying sub-line (Ⅱ) are distributed longitudinally, with the first impregnation and drying sub-line (Ⅰ) located below the second impregnation and drying sub-line (Ⅱ); The impregnation and drying production line for preparing carbon paper for fuel cells also includes a first transition roller (3.5) and a second transition roller (3.6) arranged longitudinally. The lowest point of the first transition roller (3.5) is on the same plane as the highest point of the roller assembly of the first impregnation and drying sub-line (Ⅰ); The highest point of the second transition roller (3.6) is on the same plane as the first support roller (3.2) and the second support roller (3.4) of the second impregnation and drying sub-line (Ⅱ).

9. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 8, characterized in that, The first transition roller (3.5) and the second transition roller (3.6) have the same radial dimension and are aligned longitudinally.

10. The impregnation and drying production line for preparing carbon paper for fuel cells according to claim 8, characterized in that, A second tension detection device (4.2) is provided between the second transition roller (3.6) and the impregnation unit of the second impregnation and drying sub-line (Ⅱ).

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