Electric arc furnace for producing single-walled carbon nanotubes

Abstract

The invention is applicable to the technical field of electric arc furnaces, and provides an electric arc furnace for producing a single-walled carbon nanotube, which comprises a furnace body, a graphite electrode and a purging assembly which penetrate through the furnace body, a suction assembly and a circulation assembly which are respectively communicated with the furnace body, and a collection bin arranged between the suction assembly and the circulation assembly, the graphite electrode comprises an anode graphite rod and a cathode graphite rod, the suction assembly comprises a suction air pump, a first suction pipeline and a second suction pipeline, the first suction pipeline and the second suction pipeline are communicated with the suction air pump, and a discharging plate capable of being opened and closed is arranged at the bottom of the collecting bin. The device solves the problems that part of single-walled carbon nanotubes are attached to the inner wall of the electric arc furnace to form agglomeration due to inert gas purging, and high-temperature inert gas cannot be utilized in the purging process, and achieves the purposes that the single-walled carbon nanotubes are collected by utilizing the fluidization effect of airflow, so that the single-walled carbon nanotubes are uniformly dispersed in the airflow, agglomeration is reduced, and the energy consumption is reduced. And meanwhile, the high-temperature inert gas can be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of electric arc furnaces, and more specifically, to an electric arc furnace for the production of single-walled carbon nanotubes. Background Art

[0002] When using an electric arc furnace to produce single-walled carbon nanotubes, two graphite rods are used as the cathode and anode respectively. When a high voltage is applied between the two electrodes, the gas is ionized to form an arc, generating a high temperature (the optimal reaction temperature is 600 degrees Celsius). Under the action of the high temperature of the arc, the anode graphite rod begins to evaporate, and the generated carbon vapor deposits on the surface of the cathode to form single-walled carbon nanotubes. To prevent the carbon nanotubes from being oxidized at high temperatures, an inert gas (such as helium or argon) is generally filled into the electric arc furnace as a protective gas and a conductive medium.

[0003] The main methods for collecting single-walled carbon nanotubes attached to the cathode graphite rod include physical scraping, ultrasonic-assisted scraping, inert gas purging, etc. Since physical scraping and ultrasonic-assisted scraping will cause scratches on the inner wall of the electric arc furnace during the scraping process with tools, the existing electric arc furnaces generally use the method of inert gas purging for collection.

[0004] However, when using the inert gas purging method to collect single-walled carbon nanotubes, affected by the gas flow rate and purging angle, only relying on inert gas purging will still cause some single-walled carbon nanotubes to adhere to the inner wall of the electric arc furnace, resulting in agglomeration. And during the purging process, the high-temperature inert gas is directly discharged to the external environment along with the single-walled carbon nanotubes, and the inert gas cannot be utilized. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an electric arc furnace for the production of single-walled carbon nanotubes that uses the fluidization effect of air flow to collect single-walled carbon nanotubes, enables the single-walled carbon nanotubes to be evenly dispersed in the air flow, reduces agglomeration, and can also recycle the high-temperature inert gas.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] An electric arc furnace for the production of single-walled carbon nanotubes includes a furnace body, graphite electrodes and a purging assembly penetrating the furnace body, a suction assembly and a circulation assembly respectively communicated with the furnace body, a gas storage bin arranged between the suction assembly and the circulation assembly, and a collection bin for collecting materials. The graphite electrodes include an anode graphite rod and a cathode graphite rod. The suction assembly includes a suction air pump installed on the collection bin, a first suction pipeline communicated with the furnace body, and a second suction pipeline communicated with the gas storage bin. A switchable blanking plate is arranged at the bottom of the collection bin. The circulation assembly includes a circulation air pump and a first circulation pipeline and a second circulation pipeline communicated with the circulation air pump.

[0008] The present invention is further configured such that: the suction pump is arranged on the side of the collection bin away from the furnace body, and one end of the suction pump is connected to a suction motor.

[0009] The present invention is further configured such that: the suction pump is in internal communication with the collection bin, and a first regulating valve is arranged on the first suction pipeline near the collection bin.

[0010] The present invention is further configured such that: one end of the first circulation pipeline away from the circulation pump is in internal communication with the storage bin, and one end of the second circulation pipeline away from the circulation pump is in internal communication with the furnace body.

[0011] The present invention is further configured such that: one end of the circulation pump is connected to a circulation motor, and a second regulating valve is arranged on the second circulation pipeline.

[0012] The present invention is further configured such that: the bottom of the collection bin is provided with a discharge opening, and the shape of the discharge opening is adapted to the shape of the blanking plate.

[0013] The present invention is further configured such that: rotating rods are symmetrically arranged on both sides of the collection bin, and the blanking plate is connected to each rotating rod.

[0014] The present invention is further configured such that: cylinders are symmetrically installed on both sides of the collection bin, a regulating member is connected to the bottom of the cylinder, and connecting rods are rotatably installed on both sides of the regulating member.

[0015] The present invention is further configured such that: one end of the connecting rod away from the regulating member is rotatably connected to the side wall of the connecting rod.

[0016] By adopting the above technical solution, the cylinder drives the regulating member to move, driving the blanking plate to rotate along the axis of the rotating rod, realizing the opening and closing of the discharge opening, and ensuring the normal operation of the collection bin during the collection and blanking of single-walled carbon nanotubes through the opening and closing of the discharge opening.

[0017] The present invention is further configured such that: the purging assembly includes a purging cylinder penetrating the furnace body and a purging gun inserted into the purging cylinder, and the purging cylinder is arranged on the furnace body near the cathode graphite rod.

[0018] The beneficial effects of the present invention are:

[0019] On the basis of separating single-walled carbon nanotubes by using a purging component, an air suction pump is further used to suck inert gas and single-walled carbon nanotubes into a first suction pipeline and transport them through the first suction pipeline to a collection bin for collection, so as to make full use of the air suction pump to cause the internal airflow of the furnace body to circulate, and use the gas fluidization effect to evenly disperse the carbon nanotubes and reduce agglomeration. At the same time, the inert gas in the collection bin is separated from the single-walled carbon nanotubes, and the inert gas is transported through a second suction pipeline to a gas storage bin for storage. Finally, a circulating gas pump is used to transport the inert gas through a second circulation pipeline to the inside of the furnace body for circulation, and make full use of the heat of the inert gas. Brief Description of the Drawings

[0020] The present invention will be further described below in conjunction with the drawings and embodiments.

[0021] Figure 1 It is a schematic structural diagram of an electric arc furnace for producing single-walled carbon nanotubes according to the present invention.

[0022] Figure 2 It is Figure 1 the front view shown.

[0023] Figure 3 It is Figure 1 the top view shown.

[0024] Figure 4 It is along Figure 3 the sectional view in the A-A cutting direction shown.

[0025] Figure 5 It is Figure 1 the schematic structural diagram of the electric arc furnace for producing single-walled carbon nanotubes shown after removing the furnace body.

[0026] Figure 6 It is Figure 5 the top view shown.

[0027] Figure 7 It is Figure 1 the schematic structural diagram of the collection bin shown.

[0028] Figure 8 It is Figure 7 the schematic structural diagram of the collection bin in the closed state shown.

[0029] Figure 9 It is Figure 8 the schematic structural diagram of the collection bin in the closed state from another perspective shown.

[0030] Figure 10 It is Figure 1 the schematic structural diagram of the purging component shown.

[0031] Figure 11 It is Figure 10Cross-sectional view of the shown purging assembly.

[0032] Explanation of reference numerals: 1. Furnace body; 11. Furnace cavity; 12. Furnace cover; 13. Support frame;

[0033] 2. Graphite electrode; 21. Anode graphite rod; 22. Cathode graphite rod;

[0034] 3. Purging assembly; 31. Purging cylinder; 311. Delivery cavity; 312. Diverging holes; 32. Purging gun; 321. Gun head; 322. Gas delivery pipe;

[0035] 4. Suction assembly; 41. Suction motor; 42. Suction air pump; 43. First suction pipe; 44. Second suction pipe; 45. First regulating valve;

[0036] 5. Collection bin; 51. Discharge opening; 52. Rotating rod; 53. Discharge plate; 54. Connecting rod; 55. Cylinder; 56. Adjusting member; 57. Discharge rack;

[0037] 6. Circulation assembly; 61. Circulation motor; 62. Circulation air pump; 63. First circulation pipe; 64. Second circulation pipe; 65. Second regulating valve; 66. Mounting frame;

[0038] 7. Gas storage bin; 71. Gas storage rack. Detailed implementation manners

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the present invention in a schematic manner, so it only shows the components related to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1-4, An electric arc furnace for the production of single-walled carbon nanotubes, including a furnace body 1, a graphite electrode 2 penetrating the furnace body 1 and a purging assembly 3, a suction assembly 4 and a circulation assembly 6 respectively communicating with the furnace body 1, a gas storage bin 7 arranged between the suction assembly 4 and the circulation assembly 6, and a collection bin 5 for collecting materials. After the graphite electrode 2 is energized, single-walled carbon nanotubes are formed. The purging assembly 3 separates the single-walled carbon nanotubes from the graphite electrode 2. The suction assembly 4 transports the inert gas and single-walled carbon nanotubes inside the furnace body 1 to the collection bin 5. The single-walled carbon nanotubes are collected in the collection bin 5. After the inert gas is separated from the single-walled carbon nanotubes, it enters the gas storage bin 7 for storage and finally re-circulates into the furnace body 1 through the circulation assembly 6. The inside of the furnace body 1 is set as a furnace cavity 11, and a furnace cover 12 is arranged at the top. During the reaction process, the furnace cover 12 and the furnace cavity 11 remain in a sealed state. A support frame 13 is arranged outside the furnace body 1.

[0041] Please refer to Figures 1-4 , The graphite electrode 2 includes an anode graphite rod 21 and a cathode graphite rod 22. The anode graphite rod 21 and the cathode graphite rod 22 penetrate the furnace cover 12 and extend inward into the furnace cavity 11. After the graphite electrode 2 is energized, an arc is formed between the anode graphite rod 21 and the cathode graphite rod 22. The anode graphite rod 21 evaporates under the high temperature of the arc to form carbon vapor. The carbon vapor chemically reacts with the surrounding inert gas near the arc region and decomposes into carbon atoms and small carbon clusters. Under appropriate temperature and gas environment, the carbon atoms and small carbon clusters will aggregate and grow on the surface of the cathode graphite rod 22 to form single-walled carbon nanotubes.

[0042] Please refer to Figures 1-4 and Figures 10-11 , The purging assembly 3 includes a purging cylinder 31 penetrating the furnace body 1 and a purging gun 32 inserted inside the purging cylinder 31. The purging cylinder 31 is arranged on the furnace body 1 on the side close to the cathode graphite rod 22. The inside of the purging cylinder 31 is set as a conveying cavity 311, and a diversion hole 312 is arranged on the side of the purging cylinder 31 located inside the furnace cavity 11. The purging gun 32 is inserted on the side of the purging cylinder 31 located outside the furnace body 1. The gun head 312 of the purging gun 32 is inserted into the conveying cavity 311, and the other end of the purging gun 32 is connected with an air delivery pipe 322. The inert gas can be transmitted to the gun head 312 through the air delivery pipe 322, and after being conveyed through the conveying cavity 311, it is discharged into the furnace cavity 11 through the diversion hole 312. Before the reaction starts, an inert gas (such as argon or nitrogen) is first introduced into the furnace cavity 11 through the purging gun 32 to remove the oxygen inside the furnace cavity 11 and prevent the carbon nanotubes from being oxidized at high temperature. As the reaction progresses, the generated single-walled carbon nanotubes can be separated from the cathode graphite rod 22 under the purging action of the inert gas discharged from the purging gun 32.

[0043] Please refer to Figures 1-6, the suction assembly 4 includes a suction pump 42 installed on the collection bin 5, a first suction pipe 43 communicating with the furnace body 1, and a second suction pipe 44 communicating with the gas storage bin 7. The suction pump 42 is arranged on the side of the collection bin 5 away from the furnace body 1. The suction pump 42 is internally communicated with the collection bin 5. A filter screen is arranged at the connection between the suction pump 42 and the collection bin 5 to filter and separate the inert gas and single-walled carbon nanotubes, so that the inert gas is extracted while the single-walled carbon nanotubes are retained inside the collection bin 5. One end of the suction pump 42 is connected with a suction motor 41, and the top of the suction pump 42 is connected with the second suction pipe 44. It should be noted that the suction pump 42 adopts a high-temperature resistant suction pump, and the working temperature can reach up to 950 degrees at most, ensuring that the high-temperature inert gas entering the suction pump 42 will not affect its normal operation. One end of the first suction pipe 43 is internally communicated with the furnace body 1, and the other end is internally communicated with the collection bin 5. A first regulating valve 45 is arranged on the first suction pipe 43 near the collection bin 5. The suction motor 41 can drive the suction pump 42 to operate, convey the inert gas and single-walled carbon nanotubes inside the furnace chamber 11 to the first suction pipe 43, and convey the inert gas and single-walled carbon nanotubes to the collection bin 5 through the first suction pipe 43. The first regulating valve 45 is arranged on the first suction pipe 43, and by adjusting the first regulating valve 45, the first suction pipe 43 can be opened or closed to realize the opening and closing of the passage between the furnace body 1 and the collection bin 5.

[0044] Please refer to Figures 1-9, the collection bin 5 is arranged as a hollow structure. The outer wall of the collection bin 5 is connected with a blanking frame 57, and a suction pump 42 and a suction motor 41 are installed on one side of the blanking frame 57. The bottom of the collection bin 5 is provided with a blanking port 51, and the blanking port 51 is located inside the blanking frame 57. The single-walled carbon nanotubes in the collection bin 5 can be discharged from the blanking port 51 to complete the blanking. A rotatable blanking plate 53 is arranged at the bottom of the collection bin 5, and the shape of the blanking port 51 is adapted to the shape of the blanking plate 53. The blanking plates 53 are symmetrically arranged, and after the two blanking plates 53 are opened, the single-walled carbon nanotubes in the collection bin 5 can be discharged from the blanking port 51. Rotating rods 52 are symmetrically arranged on both sides of the collection bin 5, and the rotating rods 52 can rotate relative to the collection bin 5. Each rotating rod 52 is connected with a blanking plate 53, and the blanking plate 53 can rotate following the rotating rod 52. Cylinders 55 are symmetrically installed on both sides of the collection bin 5, and the bottom of the cylinder 55 is connected with an adjusting member 56. Connecting rods 54 are rotatably installed on both sides of the adjusting member 56, and one end of the connecting rod 54 far from the adjusting member 56 is rotatably connected with the side wall of the connecting rod 54. The telescopic movement of the cylinder 55 can drive the adjusting member 56 to move in the vertical direction. During the movement of the adjusting member 56, the connecting rod 54 can be driven to rotate, and finally, the blanking plate 53 and the rotating rod 52 can be synchronously driven to rotate through the rotation of the connecting rod 54, so as to realize the opening and closing of the blanking port 51. Specifically, when the cylinder contracts, it drives the adjusting member 56 to move upward, and the connecting rods 54 at both ends of the adjusting member 56 rotate synchronously to drive the blanking plate 53 to rotate along the axis of the rotating rod 52 towards the center side of the collection bin 5 until the two blanking plates 53 rotate to fit with the bottom of the collection bin 5, and the closing of the blanking port 51 can be completed. When the cylinder contracts, it drives the adjusting member 56 to move downward, and the connecting rods 54 at both ends of the adjusting member 56 rotate synchronously to drive the blanking plate 53 to rotate along the axis of the rotating rod 52 towards the side far from the center of the collection bin 5, and the opening of the blanking port 51 can be completed.

[0045] Please refer to Figures 1-6 , the gas storage bin 7 is arranged between the collection bin 5 and the circulation assembly 6, and a gas storage frame 71 is arranged at the bottom of the gas storage bin 7. The second suction pipeline 44 is communicated with the gas storage bin 7, and the suction pump 42 can transport the inert gas in the collection bin 5 to the inside of the gas storage bin 7 through the second suction pipeline 44 for storage.

[0046] Please refer to Figures 1-6, the circulation component 6 includes a circulation air pump 62, a first circulation pipeline 63 and a second circulation pipeline 64 that are connected to the circulation air pump 62. One end of the circulation air pump 62 is connected with a circulation motor 61, and an installation frame 66 is arranged at the bottom of the circulation motor 61. One end of the first circulation pipeline 63 far from the circulation air pump 62 is internally communicated with the gas storage bin 7, and one end of the second suction pipeline 44 far from the circulation air pump 62 is internally communicated with the furnace body 1. A filter screen is arranged at one end of the first circulation pipeline 63 inside the gas storage bin 7, which can further filter the inert gas inside the gas storage bin 7. The circulation motor 61 can drive the circulation air pump 62 to operate, transport the inert gas inside the collection bin 5 to the second circulation pipeline 64, and transport the inert gas to the inside of the furnace body 1 through the second circulation pipeline 64 for recycling. A second regulating valve 65 is arranged on the second circulation pipeline 64. The second circulation pipeline 64 can be opened or closed through the second regulating valve 65, so as to open and close the passage between the gas storage bin 7 and the furnace body 1.

[0047] Before the reaction, the inert gas (such as argon or nitrogen) is transmitted to the gun head 312 through the gas transmission pipe 322, and is discharged into the furnace cavity 11 through the conveying cavity 311 and the shunt holes 312 to remove the oxygen inside the furnace cavity 11 and prevent the carbon nanotubes from being oxidized at high temperature.

[0048] Then, an electric current is applied to the anode graphite rod 21 and the cathode graphite rod 22 to apply a high voltage between them, and an arc is formed between the anode graphite rod 21 and the cathode graphite rod 22. The anode graphite rod 21 evaporates under the high temperature action of the arc to form carbon vapor. The carbon vapor chemically reacts with the surrounding inert gas near the arc region and decomposes into carbon atoms and small carbon clusters. Under appropriate temperature and gas environment, the carbon atoms and small carbon clusters will aggregate and grow on the surface of the cathode graphite rod 22 to form single-walled carbon nanotubes. As the reaction progresses, the inert gas is continuously blown into the furnace cavity 11 through the purge gun 32, and the generated single-walled carbon nanotubes can be separated from the cathode graphite rod 22 under the purging action of the inert gas.

[0049] After the single-walled carbon nanotubes are separated, the suction motor 41 drives the suction air pump 42 to operate, transports the inert gas and single-walled carbon nanotubes inside the furnace cavity 11 to the first suction pipeline 43, and transports the inert gas and single-walled carbon nanotubes to the collection bin 5 through the first suction pipeline 43. After the filtration and separation of the inert gas and single-walled carbon nanotubes are completed in the collection bin 5, the inert gas continues to enter the inside of the gas storage bin 7 for storage under the action of the suction air pump 42 through the second suction pipeline 44.

[0050] The circulation motor 61 can drive the circulation air pump 62 to operate, extract the inert gas inside the gas storage bin 7, transport the inert gas to the second circulation pipeline 64 through the circulation air pump 62, and transport the inert gas to the inside of the furnace body 1 through the second circulation pipeline 64 for recycling.

[0051] On the basis of separating single-walled carbon nanotubes by using the purging assembly 3, the suction pump 42 is further used to suck the inert gas and single-walled carbon nanotubes into the first suction pipeline 43 and transport them through the first suction pipeline 43 to the collection bin 5 for collection. Thus, the suction pump 42 is fully utilized to make the air flow inside the furnace body 1 circulate, and the gas fluidization effect is used to evenly disperse the carbon nanotubes and reduce agglomeration. At the same time, the inert gas in the collection bin 5 is separated from the single-walled carbon nanotubes, and the inert gas is transported through the second suction pipeline 44 to the gas storage bin 7 for storage. Finally, the circulating gas pump 62 is used to transport the inert gas through the second circulation pipeline 64 into the furnace body 1 for circulation, and the heat of the inert gas is fully utilized.

[0052] When the single-walled carbon nanotubes in the collection bin 5 are collected to a certain amount and need to be discharged, first close the first regulating valve 45 to close the channel between the furnace body 1 and the collection bin 5, close the second regulating valve 65 to close the channel between the gas storage bin 7 and the furnace body 1, and at the same time stop the operation of the suction pump 42 and the circulating gas pump 62, so that there is no air flow in the collection bin 5, which is convenient for the single-walled carbon nanotubes to settle to the bottom of the collection bin 5 under the action of gravity. After the single-walled carbon nanotubes settle, the cylinder contracts to drive the adjusting member 56 to move downward, and the connecting rods 54 at both ends of the adjusting member 56 rotate synchronously to drive the blanking plate 53 to rotate along the axis of the rotating rod 52 away from the center of the collection bin 5, opening the blanking port 51, and the single-walled carbon nanotubes in the collection bin 5 are discharged from the blanking port 51 to complete the discharging.

[0053] After the discharging is completed, close the blanking port 51 again, and start the suction pump 42 and the circulating gas pump 62, and then the collection of single-walled carbon nanotubes can be carried out again.

[0054] The cylinder 55 drives the adjusting member 56 to move, driving the blanking plate 53 to rotate along the axis of the rotating rod 52, realizing the opening and closing of the blanking port 51. By opening and closing the blanking port 51, it is ensured that the collection bin 5 can operate normally during the process of collecting single-walled carbon nanotubes and discharging.

[0055] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection, it can be a mechanical connection, it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0056] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0057] Based on the inspiration of the ideal embodiments of the present invention as described above, through the above description, relevant staff can make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An arc furnace for producing single-walled carbon nanotubes, characterized in that: It includes a furnace body (1), graphite electrodes (2) and a purging assembly (3) arranged through the furnace body (1), a suction assembly (4) and a circulation assembly (6) respectively communicated with the furnace body (1), a gas storage bin (7) arranged between the suction assembly (4) and the circulation assembly (6), and a collection bin (5) for collecting materials. The graphite electrode (2) includes an anode graphite rod (21) and a cathode graphite rod (22). The suction assembly (4) includes a suction air pump (42) installed on the collection bin (5), a first suction pipeline (43) communicated with the furnace body (1), and a second suction pipeline (44) communicated with the gas storage bin (7). A switchable blanking plate (53) is arranged at the bottom of the collection bin (5). The circulation assembly (6) includes a circulation air pump (62), a first circulation pipeline (63) and a second circulation pipeline (64) communicated with the circulation air pump (62).

2. The arc furnace for producing single-walled carbon nanotubes according to claim 1, characterized in that: The suction air pump (42) is arranged on the side of the collection bin (5) away from the furnace body (1), and a suction motor (41) is connected to one end of the suction air pump (42).

3. The arc furnace for producing single-walled carbon nanotubes according to claim 2, wherein: The suction air pump (42) is communicated with the inside of the collection bin (5), and a first regulating valve (45) is arranged on the first suction pipeline (43) near the collection bin (5).

4. The arc furnace for producing single-walled carbon nanotubes according to claim 1, characterized in that: One end of the first circulation pipeline (63) away from the circulation air pump (62) is communicated with the inside of the gas storage bin (7), and one end of the second circulation pipeline (64) away from the circulation air pump (62) is communicated with the inside of the furnace body (1).

5. The arc furnace for producing single-walled carbon nanotubes according to claim 4, characterized in that: A circulation motor (61) is connected to one end of the circulation air pump (62), and a second regulating valve (65) is arranged on the second circulation pipeline (64).

6. The arc furnace for producing single-walled carbon nanotubes according to claim 1, wherein: The bottom of the collection bin (5) is set as a blanking port (51), and the shape of the blanking port (51) is adapted to the shape of the blanking plate (53).

7. The arc furnace for producing single-walled carbon nanotubes according to claim 6, characterized in that: Rotating rods (52) are symmetrically arranged on both sides of the collection bin (5), and the blanking plate (53) is connected to each rotating rod (52).

8. The arc furnace for producing single-walled carbon nanotubes according to claim 7, characterized in that: Cylinders (55) are symmetrically installed on both sides of the collection bin (5), a regulating member (56) is connected to the bottom of the cylinder (55), and connecting rods (54) are rotatably installed on both sides of the regulating member (56).

9. The arc furnace for producing single-walled carbon nanotubes according to claim 8, characterized in that: One end of the connecting rod (54) away from the regulating member (56) is rotatably connected to the side wall of the connecting rod (54).

10. The arc furnace for producing single-walled carbon nanotubes according to claim 9, characterized in that: The purging assembly (3) includes a purging cylinder (31) arranged through the furnace body (1) and a purging gun (32) inserted inside the purging cylinder (31). The purging cylinder (31) is arranged on the side of the furnace body (1) close to the cathode graphite rod (22).

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