A carbon fiber felt pre-oxidation furnace

Abstract

This utility model discloses a carbon fiber felt pre-oxidation furnace, including an air intake and exhaust mechanism, a feeding mechanism arranged sequentially, at least one pre-oxidation furnace body, and a receiving mechanism. The air intake and exhaust mechanism includes an air intake pipe and an exhaust pipe. The air intake pipe is connected to an air inlet at the bottom of the pre-oxidation furnace body, and the exhaust pipe is connected to an exhaust outlet at the top of the pre-oxidation furnace body. The pre-oxidation furnace body is provided with multiple heating rods and multiple conveying layers arranged vertically. The conveying layers include multiple conveying rollers arranged along the length of the pre-oxidation furnace body. The carbon fiber felt pre-oxidation furnace of this utility model has the advantages of high production efficiency and good pre-oxidation effect.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment equipment technology, and in particular to a carbon fiber felt pre-oxidation furnace. Background Technology

[0002] To improve the structural performance and thermal stability of carbon fiber felt, it is necessary to pre-oxidize the carbon fiber felt. The existing methods for preparing soft carbon fiber pre-oxidized felt mainly include continuous production in mesh belt tunnel furnace and continuous production in single-layer roller furnace.

[0003] Traditional mesh belt tunnel furnaces are difficult to maintain, have short mesh belt lifespans, and the pre-oxidation temperature of carbon fiber felt is around 300℃. During the pre-oxidation process, a large amount of tar and moisture are volatilized, which easily corrodes the mesh belt. The equipment requires frequent cleaning and periodic replacement of the mesh belt, affecting production and resulting in high maintenance costs. Because both the upper and lower surfaces of the carbon fiber felt need to be in full contact with the reaction gas during the pre-oxidation process to ensure uniform pre-oxidation of the product surface, traditional single-layer roller furnaces can only process one layer of carbon fiber felt at a time, resulting in low production efficiency and difficulty in increasing capacity. Furthermore, the furnace chamber space of a single-layer roller furnace is small, making it difficult to control the process gas inside the furnace. Excessive oxygen concentration inside the furnace can easily lead to combustion, affecting the surface quality of the carbon fiber felt.

[0004] Chinese patent document CN117902362A discloses a continuous carbonization graphitization furnace conveying system for carbon fiber felt, which can convey three layers of felt for graphitization at one time. This technical solution is a graphitization furnace for carbon fiber felt. However, since the temperature, atmosphere, and volatiles of carbon fiber felt differ during pre-oxidation and graphitization processes, if the above method is used to stack multiple layers of felt for pre-oxidation, the felt is prone to incomplete oxidation, resulting in poor pre-oxidation effects. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a carbon fiber felt pre-oxidation furnace with high production efficiency and good pre-oxidation effect.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A carbon fiber felt pre-oxidation furnace includes an air intake and exhaust mechanism, a feeding mechanism, at least one pre-oxidation furnace body, and a receiving mechanism arranged sequentially. The air intake and exhaust mechanism includes an air intake pipe and an exhaust pipe. The air intake pipe is connected to an air intake port at the bottom of the pre-oxidation furnace body, and the exhaust pipe is connected to an exhaust port at the top of the pre-oxidation furnace body. The pre-oxidation furnace body is provided with multiple heating rods and multiple conveying layers arranged vertically. The conveying layers include multiple conveying rollers arranged along the length of the pre-oxidation furnace body.

[0008] As a further improvement to the above technical solution:

[0009] A drive assembly is provided on the outside of the pre-oxidation furnace body, and the drive assembly passes through the pre-oxidation furnace body and is connected to the conveyor roller.

[0010] The conveying layer has two layers, and the heating rod is provided between the conveying roller and the inner wall of the pre-oxidation furnace body;

[0011] The inner side of the pre-oxidation furnace body is provided with a heat insulation layer. The inner wall of the pre-oxidation furnace body and the heat insulation layer are provided with a first chamber, a second chamber and a third chamber connected in sequence. The first chamber is used to introduce protective gas. The lower heating rod penetrates the heat insulation layer and its two ends are located in the first chamber. The lower conveying roller penetrates the heat insulation layer and its two ends are located in the second chamber. The upper conveying roller and the upper heating rod penetrate the heat insulation layer and their two ends are located in the third chamber.

[0012] Both the second and third chambers are equipped with support components for supporting the rotation of the conveyor rollers.

[0013] The inner side of the pre-oxidation furnace body is provided with a heat insulation layer. The heat insulation layer is provided with a preheating channel connected to the air inlet of the pre-oxidation furnace body and a plurality of dispersion holes connected to the preheating channel. The process gas is preheated by the preheating channel and then enters the pre-oxidation furnace body through the dispersion holes.

[0014] The exhaust pipe is equipped with a pipe heater for heating the exhaust pipe.

[0015] The exhaust pipe is also equipped with a temperature measuring component, which is used to detect the temperature inside the exhaust pipe in order to control the start and stop of the pipe heater.

[0016] The intake and exhaust mechanism also includes an internal air supply pipe, which is located between the two conveying rollers.

[0017] The receiving mechanism includes a receiving traction device and multiple receiving rollers arranged along the carbon fiber felt conveying direction. The receiving traction device is used to draw the multi-layer carbon fiber felt in the pre-oxidation furnace body into layers and collect it onto each of the receiving rollers.

[0018] The material receiving and traction device is equipped with a tension detector for detecting the tension of the carbon fiber felt and a meter counter for detecting the travel length of the carbon fiber felt.

[0019] Compared with the prior art, the advantages of this utility model are:

[0020] 1. The carbon fiber felt pre-oxidation furnace of this utility model, by setting up multiple conveyor layers arranged vertically, can pre-oxidize multiple layers of carbon fiber felt simultaneously, resulting in high production efficiency. Furthermore, the design of multiple rollers brings a larger effective space inside the furnace, allowing for smoother flow of process gas within the pre-oxidation furnace. This effectively avoids combustion in the furnace due to excessive oxygen content in some areas, resulting in high surface quality of the carbon fiber felt and good pre-oxidation effect.

[0021] 2. The carbon fiber felt pre-oxidation furnace of this utility model improves the sealing performance of the pre-oxidation furnace body by introducing protective gas into the first chamber, the second chamber and the third chamber to prevent external gas from entering the furnace through the gap between the conveying rollers and the pre-oxidation furnace body.

[0022] 3. In the carbon fiber felt pre-oxidation furnace of this utility model, after the process gas enters the pre-oxidation furnace body through the gas inlet pipe, it will first be preheated in the preheating channel in the insulation layer, and then dispersed into the interior of the pre-oxidation furnace body through various dispersion holes, thereby improving the uniformity of gas intake.

[0023] 4. The carbon fiber felt pre-oxidation furnace of this utility model heats the exhaust pipe with a heater, which can prevent the tar gas volatilized during the pre-oxidation process from condensing and causing blockage in the exhaust pipe. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the carbon fiber felt pre-oxidation furnace of this utility model.

[0025] Figure 2 This is a schematic diagram of the pre-oxidation furnace body in the carbon fiber felt pre-oxidation furnace of this utility model.

[0026] The labels in the diagram represent: 1. Feeding mechanism; 2. Pre-oxidation furnace body; 21. Heating rod; 22. Conveyor roller; 221. Support assembly; 23. Insulation layer; 231. Preheating channel; 24. Drive assembly; 3. Receiving mechanism; 31. Receiving traction device; 32. Receiving roller; 4. Inlet and outlet mechanism; 41. Inlet pipe; 411. Inlet pressure reducing assembly; 42. Exhaust pipe; 421. Pipe heater; 422. Temperature measuring assembly; 43. Internal air supply pipe; 51. First chamber; 52. Second chamber; 53. Third chamber. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] like Figure 1 and Figure 2 As shown, the carbon fiber felt pre-oxidation furnace of this embodiment includes an air intake and exhaust mechanism 4 and a feeding mechanism 1, multiple pre-oxidation furnace bodies 2 and a receiving mechanism 3 arranged in sequence. The air intake and exhaust mechanism 4 includes an air intake pipe 41 and an exhaust pipe 42. The air intake pipe 41 is connected to the air intake port at the bottom of the pre-oxidation furnace body 2, and the exhaust pipe 42 is connected to the exhaust port at the top of the pre-oxidation furnace body 2. The pre-oxidation furnace body 2 is provided with multiple heating rods 21 and multiple conveying layers arranged vertically. The conveying layers include multiple conveying rollers 22 arranged along the length direction of the pre-oxidation furnace body 2.

[0032] In this embodiment of the carbon fiber felt pre-oxidation furnace, during operation, the feeding mechanism 1 feeds multiple layers of carbon fiber felt into the pre-oxidation furnace body 2, which are then conveyed forward by multiple conveyor layers. After pre-oxidation, the carbon fiber felt is wound up by the receiving mechanism 3. During the pre-oxidation process, process gas is introduced into the pre-oxidation furnace body 2 through the air inlet pipe 41, and the waste gas that has undergone oxidation is discharged through the exhaust pipe 42. This embodiment of the carbon fiber felt pre-oxidation furnace, by setting up multiple conveyor layers arranged vertically, can simultaneously pre-oxidize multiple layers of carbon fiber felt, resulting in high production efficiency. Furthermore, the multi-layer roller design provides a larger effective space inside the furnace, allowing for smoother flow of process gas within the pre-oxidation furnace body 2. This effectively prevents combustion in some areas of the furnace due to excessive oxygen content, resulting in high surface quality of the carbon fiber felt and excellent pre-oxidation effect.

[0033] Furthermore, in this embodiment, a drive assembly 24 is provided on the outer side of the pre-oxidation furnace body 2. The drive assembly 24 passes through the pre-oxidation furnace body 2 and is connected to the conveyor roller 22. The drive assembly 24 passes through the pre-oxidation furnace body 2 to drive the conveyor roller 22 to rotate, which is simple and reliable in structure.

[0034] Preferably, in this embodiment, the drive assembly 24 includes a drive motor, a drive shaft, and a connecting sleeve connected in sequence. The connecting sleeve is connected to the conveying roller 22, and the drive motor is fixed outside the pre-oxidation furnace body 2, resulting in a stable structure. Multiple drive assemblies 24 are provided, and each conveying roller 22 is driven by an independent drive assembly 24. By controlling the rotation speed of the drive motor, the rotation speed of the upper and lower conveying rollers 22 and the conveying rollers 22 in different areas can be controlled independently, thereby offsetting the speed difference caused by the shrinkage of the carbon fiber felt during the pre-oxidation process.

[0035] Preferably, in this embodiment, a float flow meter is provided between the air inlet pipe 41 and the air inlet of each pre-oxidation furnace body 2. By adjusting the opening of the float flow meter, the air intake of each pre-oxidation furnace body 2 can be controlled individually.

[0036] Preferably, in this embodiment, an intake pressure reducing assembly 411 is provided between the intake pipe 41 and the external air supply equipment. The intake pressure reducing assembly 411 includes a flange ball valve, a pressure reducing valve, a proportional regulating valve and a vortex flow meter to control the total intake volume and intake pressure of the equipment.

[0037] Furthermore, in this embodiment, the conveying layer has two layers. A heating rod 21 is provided between the conveying roller 22 and the inner wall of the pre-oxidation furnace body 2. An insulation layer 23 is provided on the inner side of the pre-oxidation furnace body 2. A first chamber 51, a second chamber 52, and a third chamber 53 are sequentially connected between the inner wall of the pre-oxidation furnace body 2 and the insulation layer 23. The first chamber 51 is used to introduce protective gas. The lower heating rod 21 penetrates the insulation layer 23 and its two ends are located in the first chamber 51. The lower conveying roller 22 penetrates the insulation layer 23 and its two ends are located in the second chamber 52. The upper conveying roller 22 and the upper heating rod 21 penetrate the insulation layer 23 and their two ends are located in the third chamber 53. Since the drive assembly 24 needs to pass through the pre-oxidation furnace body 2 and connect to the conveyor roller 22, protective gas is introduced into the first chamber 51, the second chamber 52 and the third chamber 53 to prevent external gas from entering the furnace through the gap between the conveyor roller 22 and the pre-oxidation furnace body 2, thereby improving the sealing of the pre-oxidation furnace body 2.

[0038] Furthermore, in this embodiment, both the second chamber 52 and the third chamber 53 are provided with support components 221 for supporting the rotation of the conveyor roller 22. By supporting the conveyor roller 22 with the support components 221, the rotation of the conveyor roller 22 is more stable, improving the smoothness of the carbon fiber felt conveying.

[0039] Furthermore, in this embodiment, an insulation layer 23 is provided on the inner side of the pre-oxidation furnace body 2. The insulation layer 23 is provided with a preheating channel 231 communicating with the air inlet of the pre-oxidation furnace body 2, and multiple dispersion holes (not shown in the figure) communicating with the preheating channel 231. After the process gas is preheated by the preheating channel 231, it enters the pre-oxidation furnace body 2 through the dispersion holes. After the process gas enters the pre-oxidation furnace body 2 from the air inlet pipe 41, it will first be preheated in the preheating channel 231 in the insulation layer 23, and then dispersed into the interior of the pre-oxidation furnace body 2 through the dispersion holes, thereby improving the uniformity of the air intake.

[0040] Preferably, in this embodiment, the insulation layer 23 is constructed from a combination of heavy and light refractory materials, which can effectively isolate the heat transfer from the inside of the pre-oxidation furnace body 2 to the outside of the pre-oxidation furnace body 2, preventing heat loss from the furnace cavity. The innermost layer of the insulation layer 23 is entirely made of heavy refractory materials, which can better resist the corrosion of tar gas and water vapor generated during the pre-oxidation of carbon fiber felt. The inner wall of the pre-oxidation furnace body 2 is sprayed with a temperature-resistant and corrosion-resistant sealing coating, which can effectively resist the erosion of the tar and water mixture that seeps in, and extend the service life.

[0041] Furthermore, in this embodiment, the exhaust pipe 42 is provided with a pipe heater 421 for heating the exhaust pipe 42. Heating the exhaust pipe 42 by the heater 421 can prevent the tar gas volatilized during the pre-oxidation process from condensing and causing blockage in the exhaust pipe 42.

[0042] Furthermore, in this embodiment, a temperature measuring component 422 is also provided on the exhaust pipe 42. The temperature measuring component 422 is used to detect the temperature inside the exhaust pipe 42 to control the start and stop of the pipe heater 421. The temperature measuring component 422 can detect the temperature inside the exhaust pipe 42 in real time and adjust the heater 421 accordingly to prevent tar gas from condensing inside the exhaust pipe 42, thus achieving a high degree of automation.

[0043] Preferably, in this embodiment, a first baffle valve is provided between the exhaust pipe 42 and the exhaust port of the pre-oxidation furnace body 2 to control the exhaust of a single pre-oxidation furnace body 2; a second baffle valve is provided on one side of the exhaust pipe 42 to facilitate observation or air replenishment, and can also be used as a cleaning port for the pipe during equipment maintenance.

[0044] Furthermore, in this embodiment, the intake and exhaust mechanism 4 also includes an internal air supply pipe 43, which is located between the two conveying rollers 22. By supplementing the process gas between the two layers of carbon fiber felt through the internal air supply pipe 43, it is possible to prevent uneven pre-oxidation between the two sides and the center of the carbon fiber felt due to its excessive width, thereby improving the pre-oxidation effect.

[0045] Furthermore, in this embodiment, the receiving mechanism 3 includes a receiving traction device 31 arranged along the carbon fiber felt conveying direction and multiple receiving rollers 32. The receiving traction device 31 is used to draw the multi-layer carbon fiber felt in the pre-oxidation furnace body 2 into layers and collect it onto each receiving roller 32. The receiving traction device 31 draws the two layers of carbon fiber felt into layers and collects it onto each receiving roller 32, which is simple and reliable.

[0046] Furthermore, in this embodiment, the receiving traction device 31 is equipped with a tension detector for detecting the tension of the carbon fiber felt and a meter counter for detecting the travel length of the carbon fiber felt. By detecting the tension and meter counter and adjusting the receiving speed of the receiving roller 32 based on feedback, the felt body can be prevented from breaking, resulting in a high degree of automation.

[0047] Preferably, in this embodiment, the unwinding mechanism 1 includes an unwinding frame and multiple unwinding carts. The carbon fiber felt is placed on the unwinding carts, pushed into a designated area, fixed in position by the clamping arm of the unwinding frame, and then passes through the fixed roller on the unwinding frame before entering the pre-oxidation furnace body 2 together.

[0048] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the spirit and technical solution of the present utility model. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A carbon fiber mat pre-oxidation furnace characterized by: It includes an air intake and exhaust mechanism (4) and a feeding mechanism (1) arranged in sequence, at least one pre-oxidation furnace body (2) and a receiving mechanism (3). The air intake and exhaust mechanism (4) includes an air intake pipe (41) and an exhaust pipe (42). The air intake pipe (41) is connected to the air inlet at the bottom of the pre-oxidation furnace body (2), and the exhaust pipe (42) is connected to the exhaust outlet at the top of the pre-oxidation furnace body (2). The pre-oxidation furnace body (2) is provided with multiple heating rods (21) and multiple conveying layers arranged vertically. The conveying layers include multiple conveying rollers (22) arranged along the length of the pre-oxidation furnace body (2).

2. The carbon fiber mat pre-oxidation furnace according to claim 1, characterized by: The pre-oxidation furnace body (2) is provided with a drive assembly (24) on the outside, which passes through the pre-oxidation furnace body (2) and is connected to the conveyor roller (22).

3. The carbon fiber mat pre-oxidation furnace according to claim 2, characterized by: The conveying layer has two layers, and the heating rod (21) is provided between the conveying roller (22) and the inner wall of the pre-oxidation furnace body (2). The inner side of the pre-oxidation furnace body (2) is provided with a heat insulation layer (23). The inner wall of the pre-oxidation furnace body (2) and the heat insulation layer (23) are provided with a first chamber (51), a second chamber (52) and a third chamber (53) connected in sequence. The first chamber (51) is used to introduce protective gas. The lower heating rod (21) penetrates the heat insulation layer (23) and both ends are located in the first chamber (51). The lower conveying roller (22) penetrates the heat insulation layer (23) and both ends are located in the second chamber (52). The upper conveying roller (22) and the upper heating rod (21) penetrate the heat insulation layer (23) and both ends are located in the third chamber (53).

4. The carbon fiber mat pre-oxidation furnace according to claim 3, characterized by: The second chamber (52) and the third chamber (53) are each provided with a support assembly (221) for supporting the rotation of the conveyor roller (22).

5. The carbon fiber mat pre-oxidation furnace of claim 1, wherein: The inner side of the pre-oxidation furnace body (2) is provided with a heat insulation layer (23). The heat insulation layer (23) is provided with a preheating channel (231) connected to the air inlet of the pre-oxidation furnace body (2) and a plurality of dispersion holes connected to the preheating channel (231). The process gas is preheated by the preheating channel (231) and then enters the pre-oxidation furnace body (2) through the dispersion holes.

6. The carbon fiber mat pre-oxidation furnace of claim 1, wherein: The exhaust pipe (42) is provided with a pipe heater (421) for heating the exhaust pipe (42).

7. The carbon fiber felt pre-oxidation furnace according to claim 6, characterized in that: The exhaust pipe (42) is also equipped with a temperature measuring component (422), which is used to detect the temperature inside the exhaust pipe (42) to control the start and stop of the pipe heater (421).

8. The carbon fiber mat pre-oxidation furnace of claim 1, wherein: The intake and exhaust mechanism (4) also includes an internal air supply pipe (43) located between the two conveying rollers (22).

9. The carbon fiber mat pre-oxidation furnace according to any one of claims 1 to 8, characterized by: The receiving mechanism (3) includes a receiving traction device (31) arranged along the carbon fiber felt conveying direction and a plurality of receiving rollers (32). The receiving traction device (31) is used to draw the multi-layer carbon fiber felt in the pre-oxidation furnace body (2) into layers and collect it into each of the receiving rollers (32).

10. The carbon fiber mat pre-oxidation furnace of claim 9, wherein: The material receiving and traction device (31) is equipped with a tension detector for detecting the tension of the carbon fiber felt and a meter counter for detecting the travel length of the carbon fiber felt.

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