CN118896492A - A transmission device and a carbonization system - Google Patents

Abstract

The invention discloses a conveying device and a carbonization system, wherein the conveying device is used for conveying carbon paper to be carbonized through a carbonization furnace for carbonization and comprises the following components: the first guide rail and the second guide rail are oppositely arranged in the horizontal direction, and at least one section of the first guide rail and at least one section of the second guide rail are positioned in the carbonization furnace; a stretching structure including a sliding portion and a connecting portion; the first guide rail and the second guide rail are respectively connected with a stretching structure in sliding fit with the first guide rail and the second guide rail, wherein a plurality of sliding parts are respectively in sliding fit with the first guide rail and the second guide rail, and the connecting parts are used for being fixedly connected to two sides of the width of the carbon paper; in the width direction of the carbon paper in the carbonization process, the stretching structure provides tension for the carbon paper to inhibit the carbon paper from shrinking under heating. According to the carbonization residence time and the temperature interval, the interval between the guide rails at two sides is regulated and controlled to control the tension of the carbon paper material in the width direction, so that the shrinkage deformation of the material caused by the thermal effect in the high-temperature carbonization process is effectively reduced.

Description

A transmission device and a carbonization system

Technical Field

The present invention relates to the technical field of high-temperature carbonization, and more specifically, to a transmission device and a carbonization system.

Background Art

Carbon paper is the key core material of fuel cell membrane electrode. However, during the high-temperature carbonization process, the rolled carbon paper cannot provide effective tension in the width direction of the carbon paper. If the carbon paper is allowed to shrink freely, the paper surface may become wrinkled, deformed, or even cracked, making it difficult to complete continuous carbonization preparation. The carbon chain structure in the carbon paper is broken, which will affect the degree of graphitization of the material, and ultimately lead to a decrease in the conductivity and mechanical strength of the carbon paper. As the substrate of the gas diffusion layer, the performance degradation of carbon paper will inevitably affect the power generation efficiency and life of the membrane electrode, and may even cause irreversible damage to the fuel cell stack structure.

Therefore, how to provide a transmission device and a carbonization system that can effectively control the free shrinkage of carbon paper materials in the width direction has become a technical problem that urgently needs to be solved in this field.

Summary of the invention

The object of the present invention is to provide a transmission device and a carbonization system which can effectively control the free shrinkage of carbon paper material in the width direction.

A first aspect of the present invention provides a transmission device for conveying carbon paper to be carbonized through a carbonization furnace for carbonization, comprising:

A first guide rail and a second guide rail are arranged opposite to each other in a horizontal direction, and at least one section of the first guide rail and the second guide rail is located in the carbonization furnace;

The stretching structure includes a sliding part and a connecting part; the first guide rail and the second guide rail are respectively connected with the stretching structure slidably matched therewith, wherein the plurality of sliding parts are respectively slidably matched with the first guide rail and the second guide rail, and the connecting part is used to be fixedly connected to both sides of the width of the carbon paper;

During the carbonization process, the tensile structure provides tension to the carbon paper in the width direction of the carbon paper to inhibit the carbon paper from shrinking due to heat.

Optionally, in the transport direction, the spacing between the first guide rail and the second guide rail changes according to a preset rule.

Optionally, in the transmission direction, at least a first operation area, a second operation area, a third operation area and a fourth operation area are sequentially arranged;

At the entrance of the first working area, the distance between the first guide rail and the second guide rail is D1;

At the entrance of the second working area, the distance between the first guide rail and the second guide rail is D2;

At the entrance of the third working area, the distance between the first guide rail and the second guide rail is D3;

At the entrance of the fourth operating area, the distance between the first guide rail and the second guide rail is D4;

At the exit of the fourth operating area, the distance between the first guide rail and the second guide rail is D5;

Wherein, D1＝D2, D2＞D3, D3＝D4, D4≤D5; and/or D1:D2:D3:D4:

D5=1: 1: 0.95～0.99: 0.95～0.99: 0.95～0.99.

Optionally, the length of the first working area: the length of the second working area: the length of the third working area: the length of the fourth working area = 1:3:2.5:1.5;

And/or, the working temperature of the first working area is 200°C to 260°C; the working temperature of the second working area is 450°C to 720°C; the working temperature of the third working area is 900°C to 1600°C; and the working temperature of the fourth working area is room temperature.

Optionally, in the conveying direction, a plurality of stretching structures are staggeredly arranged on the first guide rail and the second guide rail, respectively.

Optionally, the plurality of tensile structures disposed on the first guide rail are distributed at equal intervals;

And/or the multiple tensile structures arranged on the second guide rail are distributed at equal intervals.

Optionally, one side of the first guide rail and the other side of the second guide rail are respectively provided with a slide groove arranged along the extension direction thereof, the cross-sections of the two slide grooves are circular, and the openings of the two slide grooves are opposite to each other;

The sliding part is a ball head, which is slidably installed in the slide groove, and the first guide rail and the second guide rail limit and block the ball head in the direction toward the center of the first guide rail and the second guide rail.

Optionally, the connecting part includes a first pressing plate and a second pressing plate, a ball head is connected to the side of the first pressing plate close to the slide groove, and the two ball heads are arranged in sequence along the extension direction of the slide groove; the first pressing plate and the second pressing plate are arranged relative to each other to form a clamping position, and the edge of the carbon paper is clamped by the first pressing plate and the second pressing plate.

Optionally, a front transmission mechanism and a rear transmission mechanism are respectively provided on the front and rear sides of the carbonization furnace;

The front transmission mechanism and the rear transmission mechanism each include two drive rollers arranged opposite to each other, the carbon paper passes through the slit between the two drive rollers arranged opposite to each other, the carbon paper is clamped by the two drive rollers arranged opposite to each other, and when the drive rollers rotate, the carbon paper moves forward along the conveying direction under the action of friction. The second aspect of the present invention provides a carbonization system, including a carbonization furnace and a transmission device according to any one of the first aspects of the present invention, the transmission device being used to convey the carbon paper through the carbonization furnace for carbonization.

According to the technical content disclosed in the present invention, the following beneficial effects are achieved:

When the transmission device provided by the present invention is used for carbonization, the connecting parts are fixedly connected to both sides of the width of the carbon paper. When the carbon paper enters the carbonization furnace for carbonization along with the stretching structure, the carbon paper is heated and produces thermal contraction in the width direction. At this time, since the other end of the stretching structure is connected to the first guide rail and the second guide rail, the stretching structure tightens the carbon paper on both sides of the width of the carbon paper, ensuring that the stretching structure provides tension for the carbon paper in the width direction of the carbon paper during the carbonization process to suppress the thermal contraction of the carbon paper.

Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

FIG1 is a schematic structural diagram of a carbonization system of the present invention.

FIG. 2 is a schematic diagram of the structure of the transmission device of the present invention.

FIG. 3 is a schematic diagram of the tensile structure of the present invention.

FIG. 4 is a schematic cross-sectional view of the tensile structure of the present invention.

FIG. 5 is a schematic diagram of the installation of the tensile structure of the present invention.

FIG. 6 is a schematic diagram of the guide rail structure of the present invention.

Explanation of the reference numerals: 11. preheating zone; 12. shaping zone; 13. carbonization zone; 14. cooling zone; 101. first guide rail; 102. second guide rail; 2. stretching structure; 201. second pressure plate; 202. ball head; 203. bolt; 204. flexible felt; 205. lubricating powder; 206. first pressure plate; 3. carbon paper; 4. unwinding mechanism; 51. front transmission mechanism; 52. rear transmission mechanism; 6. winding mechanism; 7. carbonization furnace; 71. front air sealing device; 72. rear air sealing device; 73. front air inlet; 74. rear air inlet; 75. exhaust port.

DETAILED DESCRIPTION

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

Referring to FIG. 1 , the present invention discloses a carbonization system, including a carbonization furnace 7 and a transmission device made of high-density graphite. The transmission device is used to transport the carbon paper 3 through the carbonization furnace 7 for carbonization.

1 and 2, the transmission device includes a first guide rail 101, a second guide rail 102, a stretching structure 2, an unwinding mechanism 4, a front transmission mechanism 51, a rear transmission mechanism 52 and a rewinding mechanism 6. The first guide rail 101 and the second guide rail 102 are arranged opposite to each other in the horizontal direction, and at least one section of the first guide rail 101 and the second guide rail 102 is located in the carbonization furnace; in this embodiment, the entire transmission device is fixed in the furnace body of the carbonization furnace 7, that is, the first guide rail 101 and the second guide rail 102 are respectively fixed on both sides of the furnace chamber of the carbonization furnace and kept horizontal.

In conjunction with Figures 3 to 6, the stretching structure 2 includes a sliding portion and a connecting portion; the first guide rail 101 and the second guide rail 102 are respectively connected with the stretching structure 2 that slides therewith, wherein the plurality of sliding portions slides with the first guide rail 101 and the second guide rail 102, respectively, and the connecting portion is used to be fixedly connected to both sides of the width of the carbon paper to fix the carbon paper, so that the carbon paper 3 can slide forward synchronously with the stretching structure 2 through the furnace body of the carbonization furnace 7 for high-temperature carbonization. During the carbonization process, in the width direction of the carbon paper 3, the stretching structure 2 provides the carbon paper 3 with tension in the opposite direction of the free shrinkage direction to inhibit the carbon paper 3 from shrinking due to heat. The plurality of stretching structures 2 arranged on the first guide rail 101 are evenly spaced and the plurality of stretching structures 2 arranged on the second guide rail 102 are evenly spaced, so that the force on the carbon paper 3 during the sliding process is more uniform. Further, in conjunction with Figure 6, in the conveying direction, the plurality of stretching structures 2 are staggeredly arranged on the first guide rail 101 and the second guide rail 102, respectively, so that the arrangement is conducive to the stress release at the edge connection of the carbon paper 3 and ensures the stability of the tension of the carbon paper 3 during the thermal decomposition process.

The unwinding mechanism 4 and the front transmission mechanism 51 are provided at the front side of the carbonization furnace 7, and the rear transmission mechanism 52 and the winding mechanism 6 are provided at the rear side of the carbonization furnace 7. The conveying direction of the transmission device is from the unwinding mechanism 4 to the winding mechanism 6. The two sides of the length of the carbon paper 3 are respectively wound on the outer periphery of the unwinding mechanism 4 and the winding mechanism 6. The carbon paper 3 between the front transmission mechanism 51 and the rear transmission mechanism 52 is in a tensioned state in the length direction. Under the driving action of the front transmission mechanism 51 and the rear transmission mechanism 52, the carbon paper 3 moves forward in the conveying direction, and the unwinding mechanism 4 unwinds synchronously, and the winding mechanism 6 winds synchronously. The front transmission mechanism 51 and the rear transmission mechanism 52 both include driving rollers arranged on the upper and lower sides of the carbon paper 3. The driving rollers arranged on the upper and lower sides of the carbon paper 3 clamp the carbon paper 3. The carbon paper 3 passes through the slit between the two driving rollers arranged oppositely. When the driving rollers rotate, the carbon paper 3 moves forward along the conveying direction under the action of friction.

The front and rear ends of the furnace chamber of the carbonization furnace 7 are respectively equipped with a front air sealing device 71 and a rear air sealing device 72. A front air inlet 73 is provided at the bottom of the front air sealing device 71, and a rear air inlet 74 is provided at the bottom of the rear air sealing device 72. Nitrogen is continuously introduced into the furnace chamber through the front air inlet 73 and the rear air inlet 74, and a slight positive pressure is maintained in the chamber, thereby effectively reducing the oxidation and decomposition of the carbon paper 3 by oxygen at high temperature.

The furnace chamber of the carbonization furnace 7 includes the first operating area, the second operating area, the third operating area and the fourth operating area arranged in sequence from the entrance to the exit; wherein the first operating area is the preheating area 11, the second operating area is the shaping area 12, the third operating area is the carbonization area 13, and the fourth operating area is the cooling area 14. The length of each section area conforms to the following relationship: the length of the preheating area 11: the length of the shaping area 12: the length of the carbonization area 13: the length of the cooling area 14 = 1:3:2.5:1.5. Since the carbon paper runs at a uniform speed in each interval, the length of each area also corresponds to the residence time of the carbon paper in each temperature zone. The temperature range of each section area should be set as follows: the temperature of the preheating area 11: 200℃～260℃; the temperature of the shaping area 12: 450℃～720℃; the carbonization area 13: 900℃～1600℃; the cooling area 14 is not heated and is cooled naturally. The carbon paper passes through each section area continuously, and the residence time in different temperature zones is different. The temperature of the preheating zone 11 is 200℃～260℃. There is no obvious change in the carbon paper during this process, and its residence time can be appropriately shortened. The temperature of the shaping zone 12 is 450℃～720℃. During this process, the resin pyrolysis process is intense and the carbon paper shrinks significantly. The residence time should be effectively extended to make the pyrolysis reaction process more complete, which is conducive to the flat surface of the carbon paper and reduce wrinkles. The temperature of the carbonization zone 13 is 900℃～1600℃. During this process, the resin carbon is mainly formed, and the graphite-like structure is gradually formed. The residence time should not be too short. The cooling zone 14 mainly completes the cooling process from high temperature to room temperature, and the residence time can be shortened accordingly. It should be noted that the upper end of the furnace chamber (shaping zone) is equipped with an exhaust port 75. The exhaust port 75 can effectively discharge high-temperature thermal decomposition product gases such as _H2O , CO, _CO2 , and _CH4 .

In the transmission direction, the spacing between the first guide rail 101 and the second guide rail 102 changes according to a preset rule. At the entrance of the preheating zone 11, the spacing between the first guide rail and the second guide rail is D1; at the entrance of the shaping zone (also the exit of the preheating zone 11), the spacing between the first guide rail and the second guide rail is D2; at the entrance of the carbonization zone 13 (also the exit of the shaping zone 12), the spacing between the first guide rail and the second guide rail is D3; at the entrance of the cooling zone 14 (also the exit of the carbonization zone 13), the spacing between the first guide rail and the second guide rail is D4; at the exit of the cooling zone 14, the spacing between the first guide rail and the second guide rail is D5; wherein, D1=D2, D2>D3, D3=D4, D4≤D5, D1:D2:D3:D4:D5=1:1:0.95～0.99:0.95～0.99:0.95～0.99.

The design purpose of using adjustable guide rail spacing is as follows: the temperature in the preheating zone 11 is low and the paper sheet has no obvious shrinkage, and the guide rail spacing remains unchanged; the resin thermal decomposition carbon paper 3 in the shaping zone 12 has obvious shrinkage, and the guide rail spacing is appropriately reduced to ensure continuous provision of tension and prevent excessive tension from causing the carbon paper 3 to break; the carbonization zone 13 mainly completes the molding of the carbon paper-like graphite structure, and the carbon paper 3 has basically no obvious shrinkage, and the guide rail spacing can be maintained unchanged; and in the cooling zone 14, due to the rapid cooling of the material, the stress needs to be released quickly, and the guide rail spacing can be appropriately increased to prevent the carbon paper 3 from deforming and bending.

Optionally, the first guide rail 101 and the second guide rail 102 are respectively provided with a slide groove arranged along the extension direction thereof on the opposite side thereof, the cross-section of the two slide grooves is circular, and the openings of the two slide grooves are opposite to each other, and the arrangement of the slide grooves is convenient for fixing the tensile structure 2 on the guide rails, and enables the tensile structure 2 to slide and run continuously on the guide rails. Specifically, the inner side of the first guide rail 101 and the second guide rail 102 (the opposite side of the two guide rails) is provided with a cylindrical long through hole structure that runs through the extension direction thereof, and the through hole opens an open through groove toward the side connected to the carbon paper 3, and the open through groove and the cylindrical long through hole constitute the slide groove of the present invention.

The sliding part is a ball head 202, which is slidably installed in the slide groove. The first guide rail 101 and the second guide rail 102 limit and block the ball head 202 in the direction toward the center of the two to prevent the ball head 202 from falling out of the slide groove. Preferably, lubricating powder 205, such as graphite powder, can be added between the gap between the ball head 202 and the slide groove to ensure that the ball head 202 slides smoothly in the slide groove. The connecting part includes a first pressing plate 206 and a second pressing plate 201. The first pressing plate 206 is connected to a side close to the slide groove with a ball head 202 arranged along the extension direction of the slide groove. The first pressing plate 206 and the second pressing plate 201 are arranged relative to each other to form a clamping position. The edge of the carbon paper 3 is clamped by the first pressing plate 206 and the second pressing plate 201. The first pressing plate 206 and the second pressing plate 201 are fastened by bolts 203. A flexible gasket is provided on each side opposite to the first pressing plate 206 and the second pressing plate 201. The flexible gasket is selected from flexible felt 204. The flexible felt 204 includes graphite paper, carbon felt, etc. The edge of the carbon paper 3 is clamped between the two flexible felts 204 to ensure that the carbon paper 3 is tightly fixed to the connection part and fits flatly.

The method for assembling the transmission device includes: firstly, fixing the second pressing plate 201 on the first pressing plate 206 with two bolts according to the corresponding position; placing two ball heads 202 in the slide groove of the first guide rail 101 or the second guide rail 102 in turn; fixing the edge of one side of the carbon paper to be processed on the first pressing plate 206 and the second pressing plate 201, and pressing them tightly with bolts, with a pressing strength of 0.5 to 2 MPa. After the tensile structure 2 is fixed on one side of the carbon paper 3, the tensile structure 2 on the other side of the carbon paper 3 is installed in turn. The specific installation rules are as follows: Referring to FIG. 5, the ball head 202 on the sliding part of the first guide rail 101 facing the conveying direction corresponds in parallel to the ball head 202 on the sliding part of the second guide rail 102 away from the conveying direction; the ball head 202 on the sliding part of the first guide rail 101 away from the conveying direction corresponds in parallel to the ball head 202 on the sliding part of the second guide rail 102 facing the conveying direction; that is, the positions of the sliding parts on both sides form a sequentially alternating corresponding relationship.

The specific implementation process is as follows:

1. The carbon paper 3 to be processed is pulled from the unwinding mechanism 4 through the front transmission mechanism 51 and brought into the entrance of the carbonization furnace 7.

2. Adjust the distance between the first guide rail 101 and the second guide rail 102 to satisfy the condition D1:D2:D3:D4:D5=1:1:0.98:0.98:0.99.

3. Set the temperature of each area of the carbonization furnace 7 as follows: 260°C for the preheating zone, 560°C for the shaping zone, 1350°C for the carbonization zone, and no temperature control for the cooling zone, and heat it up to the set temperature.

4. Fix one side of the carbon paper 3 on one side of the guide rail by using the stretching structure 2, and fix the other side of the carbon paper 3 on the other side of the guide rail according to the alternating correspondence of the ball heads 202.

5. Repeat the method in step 4, and according to the corresponding method of the stretching structure 2 on both sides, continuously bring the carbon paper 3 to be processed into the carbonization furnace 7, and make the carbon paper 3 run continuously and stably.

6. After the carbon paper 3 passes through the carbonization furnace 7, the stretching structure 2 of the carbon paper 3 is removed for subsequent recycling.

7. The carbon paper 3 is pulled into the winding mechanism 6 by the rear transmission mechanism 52, and the carbonized coiled carbon paper 3 is wound up.

In summary, the technical solution of the present invention is mainly to fix the two sides of the thin layer of carbon paper (also including carbon cloth, carbon felt, etc.) material on the tensile structure 2 respectively, and the tensile structure 2 is placed in the guide rail at a fixed position. On the one hand, the carbon paper material can slide stably and uniformly in the furnace body of the carbonization furnace 7; on the other hand, according to the carbonization residence time and temperature range, the spacing between the guide rails on both sides is adjusted to control the tension of the carbon paper material in the width direction, thereby effectively reducing the shrinkage and deformation of the material caused by the thermal effect during the high-temperature carbonization process.

The transmission device provided by the present invention can effectively control the tension of the carbon paper material in the width direction, avoid thermal shrinkage in the width direction during the thermal decomposition of the resin in the carbon paper, flatten the carbon paper pages, improve the flatness of the carbon paper, and prevent wrinkles. By adopting this transmission device, the carbon paper can continuously provide stable tension during the carbonization process, effectively improve the mechanical properties of the carbon paper, and improve its graphitized crystal orientation. By adopting the width variation scheme of this transmission device, the tension in the width direction can be adjusted after the carbonization is completed, which is conducive to releasing stress during the cooling process and can effectively reduce the curling degree of the carbon paper.

Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims (10)

1. A transfer device for conveying carbon paper to be carbonized through a carbonization furnace for carbonization, comprising:

A first guide rail and a second guide rail which are oppositely arranged in the horizontal direction, wherein at least one section of the first guide rail and at least one section of the second guide rail are positioned in the carbonization furnace;

A tensile structure including a sliding portion and a connecting portion; the first guide rail and the second guide rail are respectively connected with the stretching structure in sliding fit with the first guide rail and the second guide rail, a plurality of sliding parts are respectively in sliding fit with the first guide rail and the second guide rail, and the connecting parts are used for being fixedly connected to two sides of the width of the carbon paper;

the stretching structure provides tension to the carbon paper in the width direction of the carbon paper during carbonization so as to inhibit the carbon paper from shrinking under heating.

2. The transmission device according to claim 1, wherein:

in the conveying direction, the distance between the first guide rail and the second guide rail is changed in a preset rule.

3. The transmission device according to claim 2, wherein:

the device at least comprises a first operation area, a second operation area, a third operation area and a fourth operation area which are sequentially arranged in the transmission direction;

at the entrance of the first working area, the distance between the first guide rail and the second guide rail is D1;

at the entrance of the second working area, the distance between the first guide rail and the second guide rail is D2;

At the entrance of the third working area, the distance between the first guide rail and the second guide rail is D3;

at the entrance of the fourth working area, the distance between the first guide rail and the second guide rail is D4;

At the outlet of the fourth working area, the distance between the first guide rail and the second guide rail is D5;

Wherein d1=d2, D2 > D3, d3=d4, d4.ltoreq.d5; and/or D1: d2: d3: d4:

D5＝1：1：0.95～0.99：0.95～0.99：0.95～0.99。

4. A transmission device according to claim 3, characterized in that:

length of the first working area: length of the second working area: length of the third working area: fourth working area length=1: 3:2.5:1.5;

and/or the working temperature of the first working area is 200-260 ℃; the working temperature of the second working area is 450-720 ℃; the working temperature of the third working area is 900-1600 ℃; the working temperature of the fourth working area is room temperature.

5. The transmission device according to any one of claims 1 to 4, characterized in that:

in the conveying direction, a plurality of stretching structures are respectively staggered on the first guide rail and the second guide rail.

6. The transmission apparatus according to claim 5, wherein:

The plurality of stretching structures are arranged on the first guide rail at equal intervals;

and/or a plurality of the stretching structures arranged on the second guide rail are distributed at equal intervals.

7. The transmission device according to any one of claims 1 to 4, characterized in that:

the opposite sides of the first guide rail and the second guide rail are respectively provided with a chute arranged along the extending direction, the sections of the two sliding grooves are circular, and the openings of the two sliding grooves are opposite;

The sliding part is a ball head, the ball head is slidably arranged in the chute, and the first guide rail and the second guide rail are limited in the direction towards the centers of the first guide rail and the second guide rail to block the ball head.

8. The transmission apparatus according to claim 7, wherein:

The connecting part comprises a first pressing plate and a second pressing plate, one side, close to the sliding groove, of the first pressing plate is connected with the ball heads, and the two ball heads are sequentially arranged along the extending direction of the sliding groove; the first pressing plate and the second pressing plate are oppositely arranged to form a clamping position, and the edge of the carbon paper is clamped by the first pressing plate and the second pressing plate.

9. The transmission device according to any one of claims 1 to 4, characterized in that:

front transmission mechanisms and rear transmission mechanisms are respectively arranged on the front side and the rear side of the carbonization furnace;

The front transmission mechanism and the rear transmission mechanism respectively comprise two driving rollers which are oppositely arranged, carbon paper passes through a slit between the two driving rollers which are oppositely arranged, the carbon paper is clamped by the two driving rollers which are oppositely arranged, and when the driving rollers rotate, the carbon paper moves forward along the conveying direction under the action of friction force.

10. A carbonization system, characterized by comprising a carbonization furnace and a conveying device according to any one of claims 1 to 9 for conveying carbon paper through the carbonization furnace for carbonization.