Tube furnace for producing few-walled carbon nanotubes

Abstract

The invention discloses a tubular furnace for producing few-walled carbon nanotubes, and relates to the technical field of tubular furnaces, the tubular furnace comprises a furnace tube, a rotating assembly and a feeding component, the furnace tube comprises a feeding part and a heating part, a first thread part and a second thread part are arranged on the two sides of the heating part, the feeding component comprises a discharging assembly and a pushing assembly, and the rotating assembly is arranged on the feeding part. The discharging assembly comprises a feeding barrel, a feeding pipe, a feeding valve and a discharging pipe, the pushing assembly comprises a pushing rod, a pushing head, a pushing air cylinder and an air inlet pipe, the pushing air cylinder drives the pushing rod to be pushed forwards, and the pushing head pushes materials in the discharging pipe into the furnace tube. According to the tubular furnace for producing the few-walled carbon nanotubes, materials can be concentrated in the center of the furnace tube, it is ensured that the materials are evenly heated in the heating process, the growth quality of the few-walled carbon nanotubes is improved, and the purity and consistency of products are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tube furnaces, and particularly to a tube furnace for the production of few-walled carbon nanotubes. Background Art

[0002] With the rapid development of new energy batteries, nanoelectronic devices, composite materials and other fields, the demand for high-performance carbon nanotubes is increasing day by day. Due to their excellent electrical, mechanical and chemical properties, few-walled carbon nanotubes have become a research hotspot in the field of materials science. Few-walled carbon nanotubes have a unique hollow structure, high aspect ratio and excellent electrical conductivity, making them have broad application prospects in lithium battery materials, conductive plastics, supercapacitors and other fields.

[0003] At present, the preparation methods of few-walled carbon nanotubes mainly include floating catalyst chemical vapor deposition method and fluidized bed process. However, these methods have some limitations. For example, although the floating catalyst chemical vapor deposition method can prepare high-purity few-walled carbon nanotubes, the growth efficiency is low and it is difficult to achieve large-scale production. Although the fluidized bed process can theoretically scale up the production scale, in actual operation, the uniform heating and efficient transmission of catalyst particles are still technical problems.

[0004] In the existing tube furnace technology, the uniform heating and efficient transmission of materials are key issues. In the process of heating materials in traditional tube furnaces, there are often problems such as uneven material distribution and uneven heating, resulting in limited growth quality and production efficiency of carbon nanotubes.

[0005] In view of the above problems, the present invention provides a tube furnace for the production of few-walled carbon nanotubes, which solves the deficiencies in the prior art and improves the production efficiency and product quality of few-walled carbon nanotubes. Summary of the Invention

[0006] The technical problem to be solved by the present invention is: to provide a tube furnace for the production of few-walled carbon nanotubes, which concentrates the materials in the center of the furnace tube, ensures uniform heating of the materials during the heating process, and improves the growth quality, purity and consistency of the few-walled carbon nanotubes.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: On the one hand, the present invention provides a tube furnace for the production of multi-walled carbon nanotubes. The tube furnace includes a furnace tube, a heating furnace body, a rotating assembly, and a feeding member. The furnace tube includes a feeding part and a heating part. The diameter of the heating part is larger than that of the feeding part. First thread parts and second thread parts are provided on both sides of the heating part. The feeding member includes a discharging assembly and a pushing assembly. The discharging assembly includes a feeding barrel, a feeding pipe, a feeding valve, and a blanking pipe. An air pipe is connected to the blanking pipe. The pushing assembly includes a pushing rod, a pushing head, a pushing cylinder, and an air inlet pipe. The pushing cylinder drives the pushing rod to push forward, and the pushing head pushes the material in the blanking pipe into the furnace tube. The rotating assembly drives the furnace tube to rotate, and the first thread part and the second thread part concentrate the material at the center of the furnace tube under the action of the rotation of the furnace tube.

[0008] Preferably, the heating furnace body includes a heating belt and a heat insulation layer provided outside the heating belt, and the furnace tube is arranged inside the heating belt.

[0009] Preferably, the heat insulation layer adopts a multi-layer structure, including an inner heat insulation layer and an outer heat insulation layer. The inner heat insulation layer is made of high-purity alumina fiber, and the outer heat insulation layer is made of aluminosilicate fiber to improve the heat insulation effect and reduce energy consumption.

[0010] Preferably, the rotating assembly is arranged at both ends of the furnace tube. The rotating assembly includes a motor, a speed reducer, and a transmission device. The transmission device includes a main gear, a sub-gear meshing with the main gear, and a rotating wheel. The sub-gear is sleeved on the furnace tube. The motor drives the main gear to rotate, and the furnace tube inside the sub-gear rotates following the main gear. The rotating wheel is fixedly clamped at the lower end of the furnace tube.

[0011] Preferably, the tube furnace further includes a support assembly. The support assembly includes a first furnace tube support, a second furnace tube support, a fan support, a feeding support, and a furnace body support platform. The first furnace tube support is arranged at the left end of the heating furnace body, the second furnace tube support is arranged outside the rotating assembly, and the fan support is arranged at the lower end of the second furnace tube support.

[0012] Preferably, the tube furnace further includes a sealing assembly. The sealing assembly includes a first sealing flange, a magnetic fluid joint, and a second sealing flange. A discharge pipe is connected to the first sealing flange. The first sealing flange is arranged at the left end of the furnace tube. The magnetic fluid joint is arranged at the right end of the furnace tube, and the second sealing flange is arranged at the right end of the blanking pipe.

[0013] Preferably, the magnetic fluid joint includes an inner cylinder and an outer cylinder. A bearing, a magnet, and a magnetic fluid are arranged between the inner cylinder and the outer cylinder. A flange is provided on the outer cylinder, and bolt fixing holes are opened on the flange.

[0014] Preferably, the tube furnace further includes a cooling fan disposed at the lower end of the rotating assembly, and the cooling fan cools the rotating assembly.

[0015] Preferably, the tube furnace further includes a control unit, and the control unit can control the rotation speed of the motor so that the rotation speed of the furnace tube changes according to the material reaction and transmission conditions.

[0016] Preferably, a flow sensor is provided on the feed pipe, and the flow sensor is electrically connected to the control unit, and the control unit monitors the material flow in real time and performs precise control.

[0017] The beneficial effects of the invention are as follows: By providing a first thread portion and a second thread portion in the heating portion and combining the driving of the furnace tube by the rotating assembly, the present invention can concentrate the material in the center of the furnace tube, ensuring uniform heating of the material during the heating process. This not only improves the growth quality of the few-walled carbon nanotubes but also significantly enhances the purity and consistency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be preferably described below with reference to the drawings and embodiments.

[0019] In the drawings: Figure 1 is a schematic structural diagram of a tube furnace for producing few-walled carbon nanotubes in the present invention;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the tube furnace when it is opened in ;

[0021] Figure 3 is Figure 1 a partial explosion diagram of the tube furnace in ;

[0022] Figure 4 is Figure 1 a front view of the furnace tube in ;

[0023] Figure 5 is Figure 4 a cross-sectional view of the furnace tube along the section line A-A in ;

[0024] Figure 6 is Figure 3 a partial enlarged view of A in ;

[0025] Figure 7 is Figure 3 an explosion diagram of the feeding member in ;

[0026] Figure 8 is Figure 3 a schematic structural diagram of the magnetic fluid joint in ;

[0027] Figure 9 is Figure 8Exploded view of the middle magnetorheological fluid joint;

[0028] Figure 10 For Figure 8 Cross-sectional view of the middle magnetorheological fluid joint along the section line B-B.

[0029] 100, tubular furnace; 1, furnace tube; 11, feeding part; 12, heating part; 121, first threaded part; 122, second threaded part;

[0030] 2, heating furnace body; 21, heating belt; 22, heat insulation layer; 221, inner heat insulation layer; 222, outer heat insulation layer;

[0031] 3, rotating assembly; 31, motor; 32, speed reducer; 33, transmission device; 331, main gear; 332, sub-gear; 333, rotating wheel;

[0032] 4, feeding component; 41, discharging assembly; 411, feeding barrel; 412, feeding pipe; 4121, flow sensor; 413, feeding valve; 414, blanking pipe; 415, air pipe; 42, pushing component; 421, pushing rod; 422, pushing head; 423, pushing cylinder; 424, intake pipe;

[0033] 5, supporting component; 51, first furnace tube support; 52, second furnace tube support; 53, fan support; 54, feeding support; 55, furnace body support platform;

[0034] 6, sealing component; 61, first sealing flange; 611, discharging pipe; 62, magnetorheological fluid joint; 621, inner cylinder; 622, outer cylinder; 6221, flange; 6222, bolt fixing hole; 623, bearing; 624, magnet; 625, docking flange; 63, second sealing flange; 7, cooling fan; 8, control unit. Detailed implementation manners

[0035] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments. It should be pointed out that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs. In the present invention, unless otherwise stated, the orientations such as "upper, lower" are generally in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are generally left and right as shown in the drawings; "inner, outer" refer to the inner and outer of the contours of the respective components, but the above orientation terms are not used to limit the present invention.

[0036] Such as Figure 1-2As shown in the figure, the present invention provides a tubular furnace for the production of multi-walled carbon nanotubes. The tubular furnace 100 includes a furnace tube 1, a heating furnace body 2 arranged outside the furnace tube 1, a rotating assembly 3 arranged at both ends of the furnace tube 1, a feeding member 4 arranged at one end of the furnace tube 1, a supporting assembly 5 arranged at the lower end of the rotating assembly 3, a sealing assembly 6 arranged between the furnace tube 1 and the feeding member 4, a heat dissipation fan 7 arranged at the lower end of the rotating assembly 3, and a control unit 8.

[0037] In this embodiment, specifically: As Figure 5-6 shown, the furnace tube 1 includes a feeding portion 11 and a heating portion 12. The diameter of the heating portion 12 is larger than that of the feeding portion 11. First thread portions 121 and second thread portions 122 are arranged on both sides inside the heating portion 12. The threads of the first thread portions 121 are arranged opposite to the threads of the second thread portions 122. When the furnace tube 1 rotates, the first thread portions 121 and the second thread portions 122 feed the material towards the center of the furnace tube. By arranging the first thread portions 121 and the second thread portions 122 in the heating portion 12, the rotating furnace tube 1 concentrates the material in the center of the furnace tube 1, ensuring uniform heating of the material during the heating process. This not only improves the growth quality of multi-walled carbon nanotubes but also significantly enhances the purity and consistency of the product.

[0038] In this embodiment, the material of the furnace tube 1 is a quartz glass tube. In some other embodiments, the material of the furnace tube 1 is stainless steel.

[0039] In this embodiment, specifically: The furnace tube 1 is a hollow cylinder structure.

[0040] In this embodiment, specifically: As Figure 2-3 shown, the heating furnace body 2 includes a heating belt 21 and a heat insulation layer 22 arranged outside the heating belt 21. The heat insulation layer 22 adopts a multi-layer structure. The heat insulation layer 22 includes an inner heat insulation layer 221 and an outer heat insulation layer 222.

[0041] In this embodiment, specifically: The inner heat insulation layer 221 is made of high-purity alumina fiber, and the outer heat insulation layer 222 is made of aluminum silicate fiber to improve the heat insulation effect and reduce energy consumption.

[0042] In this embodiment, specifically: As Figure 3 , 7 shown, the rotating assembly 3 is arranged at both ends of the furnace tube 1. The rotating assembly 3 includes a motor 31, a speed reducer 32, and a transmission device 33. The transmission device 33 includes a main gear 331, a sub-gear 332 meshing with the main gear 331, and a rotating wheel 333. The sub-gear 332 is sleeved on the furnace tube 1. The motor 31 drives the main gear 331 to rotate, and the furnace tube 1 inside the sub-gear 332 rotates following the main gear 331. The rotating wheel 333 is fixedly clamped at the lower end of the furnace tube 1, which can effectively realize the stable rotation of the furnace tube 1 and contribute to the uniform processing of the material inside the furnace tube.

[0043] The rotating wheel 333 is fixedly engaged with the lower end of the furnace tube 1, which plays a role in supporting and positioning the furnace tube 1, further enhancing the structural stability of the furnace tube 1 during rotation, preventing the furnace tube 1 from shaking or displacing due to rotation, improving the reliability and service life of the entire rotating assembly 3, and at the same time reducing the safety risks caused by the instability of the furnace tube 1.

[0044] In this embodiment, specifically: as Figure 4 shown, the feeding member 4 includes a discharging assembly 41 and a pushing assembly 42. The discharging assembly 41 includes a feeding barrel 411, a feeding pipe 412, a feeding valve 413, and a blanking pipe 414. An air pipe 415 is provided on the blanking pipe 414. The pushing assembly 42 includes a pushing rod 421, a pushing head 422, a pushing cylinder 423, and an air inlet pipe 424. The diameter of the pushing head 422 is smaller than the inner diameter of the blanking pipe 414. The pushing cylinder 423 is electrically connected to the control unit 8. A flow sensor 4121 is provided on the feeding pipe 412, and the flow sensor 4121 is electrically connected to the control unit 8. The control unit 8 monitors the material flow in real time and performs precise control to ensure the stable supply of materials, which is beneficial to improving the stability of the production process and the consistency of product quality. The pushing cylinder 423 drives the pushing rod 421 to push forward, and the pushing head 422 pushes the material in the blanking pipe 414 into the furnace tube 1. The rotating assembly 3 drives the furnace tube 1 to rotate, and the first thread portion 121 and the second thread portion 122 concentrate the material at the center of the furnace tube 1 under the action of the rotation of the furnace tube 1. The pushing assembly 42 continuously pushes the material into the furnace tube 1, and at the same time the rotating assembly 3 drives the furnace tube 1 to rotate, so that the material is evenly processed in the furnace tube 1, and the feeding and material concentration processing can be completed without stopping the operation of the furnace tube 1, improving the production efficiency, reducing the downtime during the production process, and being beneficial to continuous production operations.

[0045] The air pipe 415 supplies gas for the reaction. When it is necessary to discharge the material, the air pipe 415 introduces pulsed high-pressure gas to impact the reacted material to the side of the furnace tube 1 away from the air pipe 415.

[0046] In this embodiment, specifically: the support assembly 5 includes a first furnace tube support 51, a second furnace tube support 52, a fan support 53, a feeding support 54, and a furnace body support platform 55. The first furnace tube support 51 is provided at the left end of the heating furnace body 2, the second furnace tube support 52 is provided at the right end of the heating furnace body 2, the second furnace tube support 52 is provided outside the rotating assembly 3, the fan support 53 is provided at the lower end of the second furnace tube support 52, and the feeding support 54 is provided at the lower end of the feeding member 4.

[0047] In this embodiment, specifically: the sealing assembly 6 includes a first sealing flange 61, a magnetic fluid joint 62, and a second sealing flange 63. An outlet pipe 611 is connected to the first sealing flange 61. The first sealing flange 61 is provided at the left end of the furnace tube 1, the magnetic fluid joint 62 is provided at the right end of the furnace tube 1, and the second sealing flange 63 is provided at the right section of the blanking pipe 414.

[0048] The discharge pipe 611 is used to discharge waste gas and the materials after the reaction is completed. The side pipe of the discharge pipe 611 is used to discharge light waste gas, and the lower pipe is used to discharge materials.

[0049] The magnetorheological fluid joint 62 includes an inner cylinder 621 and an outer cylinder 622. A bearing 623, a magnet 624 and magnetorheological fluid are provided between the inner cylinder 621 and the outer cylinder 622. A flange 6221 is provided on the outer cylinder 622, and bolt fixing holes 6222 are formed in the flange 6221. The bolts (not shown in the figure) are fixed in the small holes of the flange 6221. When disassembly is required, the magnetorheological fluid joint 62 is rotated, and the bolts are loosened from the large holes of the flange 6221, realizing the quick disassembly of the magnetorheological fluid joint 62 and the feeding member 4. In this embodiment, specifically: as Figure 10 shown, the cooling fan 7 is provided at the lower end of the rotating assembly 3, and the cooling fan 7 cools the rotating assembly 3.

[0050] In this embodiment, specifically: the control unit 8 can control the rotation speed of the motor 31 so that the rotation speed of the furnace tube 1 is changed according to the material reaction and transmission conditions.

[0051] The working principle of the tube furnace for producing multi-walled carbon nanotubes of the present invention:

[0052] For the tube furnace for producing multi-walled carbon nanotubes provided by the present invention, when producing multi-walled carbon nanotubes, first place the materials required for production in the feeding bucket 411. Under the monitoring of the flow sensor 4121 and the precise control of the control unit 8, the feeding pipe 412 intermittently conveys the materials to the blanking pipe 414 at a stable flow rate; first, the control unit 8 controls the feeding valve 413 to open. After quantitative blanking, the control unit 8 controls the feeding valve 413 to close. Then, the pushing cylinder 423 receives the signal that the feeding valve 413 is closed, and the pushing cylinder 423 drives the pushing rod 421 to push forward. Driven by the pushing rod 421, the pushing head 422 pushes the materials in the blanking pipe 414 into the furnace tube 1. Finally, the pushing cylinder 423 retracts to drive the pushing rod 421 to return to its original position, waiting for the next blanking.

[0053] During the reaction process, protective gas and reaction gas are mixed and introduced into the trachea 415. After the heating of the material is completed, pulsed high-pressure gas is introduced into the trachea 415 to impact the reacted material into the discharge pipe 611. The material flows out from the lower end pipe of the discharge pipe 611, and the gas is discharged from the side pipe of the discharge pipe 611. When the material enters the furnace tube 1, the rotating assembly 3 is driven by the motor 31 and drives the furnace tube 1 to rotate through the speed reducer 32 and the transmission device 33. When the furnace tube 1 rotates, the first thread part 121 and the second thread part 122 on both sides inside the heating part 12 convey the material towards the center of the furnace tube 1 due to their relatively arranged thread structures. During this process, the material is evenly distributed and processed inside the furnace tube 1. At the same time, the heating belt 21 of the heating furnace body 2 heats the furnace tube 1, enabling the material to undergo a chemical reaction to generate oligomeric wall carbon nanotubes under a suitable temperature environment.

[0054] During the entire production process, the cooling fan 7 dissipates heat from the rotating assembly 3 to ensure the normal operation of the rotating assembly 3. The sealing assembly 6 ensures the sealing between the furnace tube 1 and the feeding component 4, preventing material leakage or the entry of external air from affecting the production process. The control unit 8 monitors various parameters in the entire production process in real time, such as the material flow rate, the rotation speed of the furnace tube 1, etc., and adjusts the rotation speed of the motor 31 according to the material reaction and transmission conditions to ensure the stability of the production process and the consistency of product quality.

[0055] The tubular furnace for producing oligomeric wall carbon nanotubes of the present invention has at least the following beneficial effects:

[0056] 1. By providing the first thread part 121 and the second thread part 122 in the heating part 12, the rotating furnace tube 1 can concentrate the material in the center of the furnace tube 1, ensuring uniform heating of the material during the heating process, thereby improving the growth quality of oligomeric wall carbon nanotubes and significantly enhancing the purity and consistency of the product.

[0057] 2. The heat insulation layer 22 of the heating furnace body 2 adopts a multi-layer structure. The inner heat insulation layer 221 is made of high-purity alumina fiber, and the outer heat insulation layer 222 is made of aluminosilicate fiber. This structural design effectively improves the heat insulation effect, reduces energy consumption, cuts production costs, and is also conducive to improving production efficiency and realizing the efficient utilization of energy.

[0058] 3. The rotating wheel 333 of the rotating assembly 3 is fixedly engaged at the lower end of the furnace tube 1, playing a role in supporting and positioning the furnace tube 1, enhancing the structural stability of the furnace tube 1 during rotation, preventing the furnace tube 1 from shaking or displacing due to rotation, improving the reliability and service life of the entire rotating assembly 3, reducing the safety risks caused by the instability of the furnace tube 1, and ensuring the continuity and stability of the production process.

[0059] 4. The flow sensor 4121 on the feed pipe 412 is electrically connected to the control unit 8. The control unit 8 can monitor the material flow in real time and perform precise control to ensure the stable supply of materials, which is beneficial to improving the stability of the production process and the consistency of product quality. At the same time, the control unit 8 can also control the rotation speed of the motor 31 to change the rotation speed of the furnace tube 1 according to the material reaction and transmission conditions, realizing the automatic control of the production process, reducing manual intervention, and improving the production efficiency and the stability of product quality.

[0060] 5. For the rotating flange 6221, the bolts can be quickly disassembled from the bolt fixing holes 6222, which facilitates the maintenance and cleaning of the equipment, improves the maintainability and service life of the equipment, and ensures the hygiene and safety of the production process.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof. It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tube furnace for producing few-walled carbon nanotubes, characterized in that: The tubular furnace (100) includes a furnace tube (1), a heating furnace body (2), a rotating assembly (3), and a feeding member (4). The furnace tube (1) includes a feeding portion (11) and a heating portion (12). The diameter of the heating portion (12) is larger than that of the feeding portion (11). First thread portions (121) and second thread portions (122) are provided on both sides of the heating portion (12). The feeding member (4) includes a discharging assembly (41) and a pushing assembly (42). The discharging assembly (41) includes a feeding barrel (411), a feeding pipe (412), a feeding valve (413), and a blanking pipe (414). An air pipe (415) is connected to the blanking pipe (414). The pushing assembly (42) includes a pushing rod (421), a pushing head (422), a pushing cylinder (423), and an air pipe (424). The pushing cylinder (423) drives the pushing rod (421) to push forward, and the pushing head (422) pushes the material in the blanking pipe (414) into the furnace tube (1). The rotating assembly (3) drives the furnace tube (1) to rotate. Under the rotation of the furnace tube (1), the first thread portion (121) and the second thread portion (122) concentrate the material at the center of the furnace tube (1).

2. The tubular furnace for producing few-walled carbon nanotubes according to claim 1, wherein: The heating furnace body (2) includes a heating belt (21) and a heat insulation layer (22) provided outside the heating belt (21). The furnace tube (1) is arranged inside the heating belt (21).

3. The tubular furnace for producing few-walled carbon nanotubes according to claim 2, characterized in that: The heat insulation layer (22) adopts a multi-layer structure, including an inner heat insulation layer (221) and an outer heat insulation layer (222). The inner heat insulation layer (221) is made of high-purity alumina fiber, and the outer heat insulation layer (222) is made of aluminosilicate fiber to improve the heat insulation effect and reduce energy consumption.

4. A tube furnace for producing few-walled carbon nanotubes according to claim 1, characterized in that: The rotating assembly (3) is arranged at both ends of the furnace tube (1). The rotating assembly (3) includes a motor (31), a speed reducer (32), and a transmission device (33). The transmission device (33) includes a main gear (331), a sub-gear (332) meshing with the main gear (331), and a rotating wheel (333). The sub-gear (332) is sleeved on the furnace tube (1). The motor (31) drives the main gear (331) to rotate, and the furnace tube (1) inside the sub-gear (332) rotates following the main gear (331). The rotating wheel (333) is fixedly clamped at the lower end of the furnace tube (1).

5. A tubular furnace for producing oligomeric wall carbon nanotubes according to claim 1, characterized in that: The tubular furnace (100) further includes a support assembly (5). The support assembly (5) includes a first furnace tube support (51), a second furnace tube support (52), a fan support (53), a feeding support (54), and a furnace body support platform (55). The first furnace tube support (51) is arranged at the left end of the heating furnace body (2). The second furnace tube support (52) is arranged outside the rotating assembly (3). The fan support (53) is arranged at the lower end of the second furnace tube support (52).

6. The tubular furnace for producing oligomeric wall carbon nanotubes according to claim 1, characterized in that: The tubular furnace (100) further includes a sealing assembly (6). The sealing assembly (6) includes a first sealing flange (61), a magnetic fluid joint (62), and a second sealing flange (63). A discharge pipe (611) is connected to the first sealing flange (61). The first sealing flange (61) is disposed at the left end of the furnace tube (1). The magnetic fluid joint (62) is disposed at the right end of the furnace tube (1). The second sealing flange (63) is disposed at the right end of the blanking pipe (414).

7. A tube furnace for producing few-walled carbon nanotubes according to claim 5, characterized in that: The magnetic fluid joint (62) includes an inner cylinder (621) and an outer cylinder (622). A bearing (623), a magnet (624), and magnetic fluid are provided between the inner cylinder (621) and the outer cylinder (622). A flange (6221) is provided on the outer cylinder (622), and bolt fixing holes (6222) are formed in the flange (6221).

8. A tubular furnace for producing few-walled carbon nanotubes according to claim 1, characterized in that: The tubular furnace (100) further includes a cooling fan (7). The cooling fan (7) is disposed at the lower end of the rotating assembly (3), and the cooling fan (7) cools the rotating assembly (3).

9. A tube furnace for producing oligomeric wall carbon nanotubes according to claim 4, characterized in that: The tubular furnace (100) further includes a control unit (8). The control unit (8) can control the rotation speed of the motor (31) to change the rotation speed of the furnace tube (1) according to the material reaction and transmission conditions.

10. A tube furnace for producing oligomeric wall carbon nanotubes according to claim 9, characterized in that: A flow sensor (4121) is provided on the feed pipe (412). The flow sensor (4121) is electrically connected to the control unit (8), and the control unit (8) monitors the material flow in real time and performs precise control.

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