Fluidized bed based carbon nanotube granulation forming device

Abstract

This invention belongs to the field of fluidized bed granulation technology, and specifically discloses a fluidized bed-based carbon nanotube granulation device, including a fluidized tower, a bent pipe connected to the top of the fluidized tower, a buffer cover connected to one end of the bent pipe, a distribution hopper fixed to the bottom of the buffer cover, and a return device inside the distribution hopper. In this invention, fine carbon nanotube particles are filtered and screened through a filter port inside the distribution hopper. The particles attached to one side of the filter port are scraped off by a uniform material device and collected by the return device. When the return device is full of material, the material can be discharged to the bottom of the distribution hopper and re-enter the fluidized tower for refining through a return pipe. When the return device is working, it triggers a feedback device to intermittently apply high-pressure pulses of external high-pressure gas to the filter port to clean it. At the same time, it can push the material inside the return device out to assist in its discharge.

Description

Technical Field

[0001] This invention relates to the field of fluidized bed granulation technology, and more particularly to a fluidized bed-based carbon nanotube granulation apparatus. Background Technology

[0002] Fluidized beds are reactors that use gas or liquid to suspend solid particles to achieve gas-solid or liquid-solid reactions. They include types such as dispersed fluidized beds and cohesive fluidized beds (bubbling beds, turbulent beds, and fast beds). Their critical fluidization velocity is the minimum linear velocity required for the fluid to carry the particles. Cohesive fluidized beds have a two-phase structure of bubble phase and emulsion phase. Fluidized beds can be used for granulation and molding of carbon nanotubes.

[0003] Currently, after spherical porous carbon particles form carbon nanotube particles of varying sizes inside the fluidized bed, they are transported to the outside along with the airflow. However, after being filtered, the transported particles accumulate together. Due to the different particle sizes, only the smaller particles can be used, while the larger particles need to be reprocessed. Furthermore, the accumulation of particles and their removal for external sieving will cause contamination. As a result, when the larger carbon nanotube particles are returned to the fluidized bed for secondary processing, impurities will also enter, causing contamination inside the fluidized bed. Summary of the Invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a carbon nanotube granulation and molding device based on a fluidized bed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a fluidized bed-based carbon nanotube granulation and molding device, comprising a fluidized tower, a bent pipe connected to the top of the fluidized tower, a buffer cover connected to one end of the bent pipe, a distribution hopper fixed to the bottom of the buffer cover, a return device provided inside the distribution hopper, a return pipe connected to the bottom of the distribution hopper, the bottom end of the return pipe connected to the inside of the fluidized tower, an annular cover fixed to the outside of the distribution hopper, a feedback device provided inside the distribution hopper, an annular cavity opened inside the distribution hopper, and multiple filter ports penetrating into the annular cavity equidistantly opened on the inner wall of the distribution hopper; The bottom of the annular cover is open, and annular grid rings are threaded between the inner walls of the annular cover. The inner wall of the annular grid rings slides and seals against the outer surface of the distribution hopper. Annular filter pads are installed on the top of the annular grid rings inside the annular cover, and a material leveling device is installed inside the distribution hopper.

[0006] Preferably, the top of the buffer cover is closed, an arc-shaped flow guide is fixed inside the fluidizing tower near the top edge, the bottom of the bent pipe extends through to the top surface of the arc-shaped flow guide, a fixing plate is fixed between the inner walls of the fluidizing tower near the bottom edge, and a honeycomb partition is fixed between the inner walls of the fluidizing tower above the fixing plate.

[0007] Preferably, the outer surface of the fluidizing tower is fixed with multiple legs at equal intervals near the bottom edge, the bottom of the fluidizing tower is connected to a bottom pipe, the top of the fixing plate is provided with multiple air distribution holes that extend to the bottom at equal intervals, a filter cover is provided between the top of the multiple air distribution holes, and a filter plug is provided between the bottom of the multiple air distribution holes.

[0008] Preferably, a heating jacket is provided at the middle of the outer surface of the fluidizing tower, a temperature sensor is provided on one side of the heating jacket, a side pipe is fixedly connected to one side of the fluidizing tower above the honeycomb partition, and a carrier gas pipe is fixedly connected to one side of the fluidizing tower below the heating jacket.

[0009] Preferably, the material leveling device includes a support ring, which is rotatably engaged between the inner walls of the distribution hopper and near the bottom edge of the buffer cover. A rotating shaft is provided in the middle of the support ring. Multiple vortex blades are fixed at equal intervals between the inner wall of the support ring and the outer surface of the rotating shaft. The bottom end of the rotating shaft extends to the middle of the inside of the distribution hopper. Multiple bent rods are fixed near the bottom of the outer surface of the rotating shaft. Scrapers are fixed on both sides of the inner walls of the support ring near the bottom edge. One side of each scraper is in contact with the inner wall of the distribution hopper and is located on the filter port side.

[0010] Preferably, the return device includes a cylindrical box, which is slidably and sealed between the inner walls of the distribution hopper. The bottom end of the rotating shaft and the bending rod are both located inside the cylindrical box. The inner walls on both sides of the cylindrical box are provided with discharge ports that extend to the outside near the bottom edge. The inner wall of the distribution hopper is located below the bottom of the cylindrical box and is in an annular recess. The inner walls on both sides of the distribution hopper are provided with cylindrical cavities.

[0011] Preferably, one side of each of the two cylindrical cavities extends into the interior of the distribution hopper, and a circular plate is slidably disposed between the inner walls of the two cylindrical cavities. One end of each circular plate extends into the distribution hopper and is fixed to the outer surface of the cylindrical box. A spring is fixed to the bottom of each circular plate, and the bottom of each spring is fixed to the inner bottom surface of the cylindrical cavity.

[0012] Preferably, the feedback device includes an inner sliding sleeve, an annular receiving port is provided inside the side wall of the distributing hopper, an annular cavity is provided inside the side wall of the distributing hopper, the bottom of the annular receiving port extends to the inner top surface of the annular cavity, and multiple side openings extending into the annular cover are provided at equal intervals along the circumferential direction near the bottom edge of the inner wall of the annular cavity, and the multiple side openings are all connected to the annular receiving port.

[0013] Preferably, a high-pressure pulse tube is fixed on one outer surface of the hopper above the annular cover. One end of the high-pressure pulse tube penetrates into the annular cavity and is located at the edge of the inner top surface. The high-pressure pulse tube and the annular receiving port are interconnected. The side opening is opposite to the filter port. The inner sliding sleeve is slidably sealed inside the annular receiving port. A connecting hole is opened on one side of the inner sliding sleeve near the top edge. The connecting hole is located directly above the high-pressure pulse tube. Multiple inner sealing plates are equidistantly fixed at the bottom of the inner sliding sleeve along the circumferential direction. The multiple inner sealing plates are slidably sealed between the inner walls of the annular receiving port and are all located on one side of the side opening.

[0014] Preferably, each of the multiple inner sealing plates has a through-hole on one side that extends to the other side, and the multiple through-holes are connected to the side openings. The bottom of each of the multiple inner sealing plates extends into the annular cavity. An annular piece is slidably disposed between the inner walls of the annular cavity. The bottom of each of the multiple inner sealing plates is fixed to the top of the annular piece. Guide rods are fixed to the bottom of the annular piece near the two side edges. The bottoms of the two guide rods slide through into the cylindrical cavity and are fixed to the top of the circular piece.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, fine carbon nanotube particles are filtered and sieved through a filter port inside the distribution hopper. The particles attached to one side of the filter port are scraped off by a uniform feeding device and collected by a return feeding device. When the return feeding device is full of material, the material can be discharged to the bottom of the distribution hopper and re-enter the fluidization tower for refining through a return pipe. When the return feeding device is working, it will trigger a feedback device to cause external high-pressure pulse gas to intermittently apply high-pressure pulses to the filter port to clean the filter port. At the same time, it can push the material inside the return feeding device out to assist in its discharge. 2. When the material equalization device of the present invention is working, when the airflow enters the material distribution hopper, it will impact the vortex blades, thereby driving the support ring and the rotating shaft to rotate synchronously. When the support ring rotates, it will drive the scraper to scrape off the larger carbon nanotube particles attached to the outer surface of the filter, so that they fall into the cylindrical box for collection. When the rotating shaft rotates, it will drive the bending rod to stir the carbon nanotube particles collected in the cylindrical box, so that they are lifted up. 3. When the return device of the present invention is working, the larger carbon nanotube particles that do not meet the requirements accumulate inside the cylindrical box. As the overall mass of the cylindrical box increases, it will gradually compress the spring downward. When the maximum weight is reached, the discharge ports on both sides of the cylindrical box near the bottom can slide to the annular recess inside the distribution hopper. The larger carbon nanotube particles inside the cylindrical box can be discharged into the distribution hopper through the discharge port and finally enter the fluidization tower from the return pipe for further refinement. 4. When the feedback device in this invention is working, the cylindrical box slides down and the annular plate slides down synchronously through the circular plate and the guide rod. The through-hole on the inner sealing plate slides to the bottom of the side opening and the side opening is closed by the inner sealing plate. At the same time, the connecting hole on the inner sliding sleeve slides to the position opposite to the high-pressure pulse tube. The high-pressure pulse gas enters the distribution hopper from the inside of the annular partition through the other side of the filter port, and backflushes the material blocking the filter port to achieve the purpose of cleaning the filter port. Attached Figure Description

[0016] Figure 1 This invention presents a front-view three-dimensional structural schematic diagram of a fluidized bed-based carbon nanotube granulation and molding device. Figure 2 A bottom-view three-dimensional structural diagram of a fluidized bed-based carbon nanotube granulation and molding device is provided for this invention. Figure 3 This invention provides a cross-sectional three-dimensional structural diagram of a fluidized bed-based carbon nanotube granulation and molding device. Figure 4 This invention presents a front-view three-dimensional structural diagram of the material distribution hopper in a fluidized bed-based carbon nanotube granulation and molding device. Figure 5 This invention presents a cross-sectional three-dimensional structural diagram of the material distribution hopper in a fluidized bed-based carbon nanotube granulation and molding device. Figure 6 This invention presents a three-dimensional cross-sectional view of one side of the material distribution hopper in a fluidized bed-based carbon nanotube granulation and molding device. Figure 7 This invention presents a cross-sectional three-dimensional structural diagram of the other side of the material distribution hopper in a fluidized bed-based carbon nanotube granulation and molding device. Figure 8 This invention presents a three-dimensional cross-sectional view of the internal structure of the dispensing hopper in a fluidized bed-based carbon nanotube granulation and molding device. Figure 9 For the present invention Figure 5 A magnified view of a portion of point A in the middle; Figure 10 For the present invention Figure 5 A magnified view of a portion of point B in the middle.

[0017] In the diagram: 1. Fluidized tower; 2. Support leg; 3. Bottom pipe; 4. Side pipe; 5. Carrier gas pipe; 6. Heating jacket; 7. Temperature sensor; 8. Bending pipe; 9. Return pipe; 10. Buffer cover; 11. Distributor hopper; 12. Annular cover; 13. High-pressure pulse pipe; 14. Arc-shaped guide shroud; 15. Annular grid ring; 16. Cylindrical box; 17. Support ring; 18. Vortex blade; 19. Rotating shaft; 20. Scraper; 21. Bending rod; 22. Cylindrical cavity; 23. Annular cavity; 24. Annular receiving port; 25. Annular partition; 26. Side opening; 27. Annular filter pad; 28. Filter port; 29. ​​Inner sliding sleeve; 30. Connecting hole; 31. Inner sealing plate; 32. Through port; 33. Guide rod; 34. Annular piece; 35. Spring; 36. Circular piece; 37. Discharge port; 38. Honeycomb partition; 39. Air distribution hole; 40. Filter cover; 41. Air filter plug; 42. Fixing plate. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-10 The present invention provides a technical solution: a carbon nanotube granulation and molding device based on a fluidized bed, including a fluidized tower 1, a bent pipe 8 connected to the top of the fluidized tower 1, a buffer cover 10 connected to one end of the bent pipe 8, a distribution hopper 11 fixed to the bottom of the buffer cover 10, a return device provided inside the distribution hopper 11, a return pipe 9 connected to the bottom of the distribution hopper 11, the bottom end of the return pipe 9 connected to the inside of the fluidized tower 1, an annular cover 12 fixed to the outside of the distribution hopper 11, a feedback device provided inside the distribution hopper 11, an annular cavity 25 opened inside the distribution hopper 11, and a plurality of filter ports 28 equidistantly opened on the inner wall of the distribution hopper 11, penetrating into the annular cavity 25; The bottom of the annular cover 12 is open. An annular grid ring 15 is threaded between the inner walls of the annular cover 12. The inner wall of the annular grid ring 15 slides and seals against the outer surface of the distribution hopper 11. An annular filter pad 27 is provided on the top of the annular grid ring 15 inside the annular cover 12. A material equalization device is provided inside the distribution hopper 11. The top of the buffer cover 10 is closed. An arc-shaped flow guide shroud 14 is fixed inside the fluidizing tower 1 near the top edge. The bottom of the bent pipe 8 is connected to the top surface inside the arc-shaped flow guide shroud 14. A fixing plate 42 is fixed between the inner walls of the fluidizing tower 1 near the bottom edge. A honeycomb partition 38 is fixed between the inner walls of the fluidizing tower 1 above the fixing plate 42. Multiple support legs 2 are fixed at equal intervals near the bottom edge of the outer surface of the fluidizing tower 1. The bottom of the fluidizing tower 1 is connected to a bottom pipe 3. Multiple air distribution holes 39 extending to the bottom are opened at equal intervals on the top of the fixed plate 42. Filter covers 40 are provided between the tops of the multiple air distribution holes 39, and filter plugs 41 are provided between the bottoms of the multiple air distribution holes 39. A heating jacket 6 is provided in the middle of the outer surface of the fluidizing tower 1. A temperature sensor 7 is provided on one side of the heating jacket 6. A side pipe 4 is fixedly connected above the honeycomb partition 38 on one side of the fluidizing tower 1. A carrier gas pipe 5 is fixedly connected below the heating jacket 6 on one side of the fluidizing tower 1.

[0020] The effect achieved is that spherical porous carbon particles are laid and piled on the honeycomb partition 38 inside the fluidized tower 1, the bottom pipe 3 and the side pipe 4 are connected to the external gas supply pipe, the carrier gas pipe 5 is connected to the external carrier gas supply pipe, and a constant temperature reaction zone is formed in the middle of the fluidized tower 1 through the heating jacket 6. The porous carbon particles in the fluidized state inside the fluidized tower 1 flow from the bottom to the top of the fluidized tower 1. After flowing to the constant temperature reaction zone, they will form fine carbon nanotube particles. The carbon nanotube particles flow into the buffer cover 10 through the bending pipe 8 with the airflow, and then enter the inside of the distribution hopper 11. Fine carbon nanotube particles are filtered and screened inside the distribution hopper 11 through the filter port 28. Larger carbon nanotube particles will adhere to one side of the filter port 28 and be scraped off by the uniform material device to the return material device for collection. When the uniform material device is working, it can also uniformly distribute the carbon nanotube particles collected inside the return material device. When the return material device is full, the material can be discharged to the bottom of the distribution hopper 11 and re-enter the fluidization tower 1 for refining through the return pipe 9. When the return material device is working, it will trigger the feedback device, so that the external high-pressure pulse gas will intermittently apply high-pressure pulses to the filter port 28 to clean the filter port 28. At the same time, it can push the material inside the return material device out to assist in its discharge.

[0021] like Figure 5 , Figure 6 , Figure 8 and Figure 9 As shown, the material leveling device includes a support ring 17, which is rotatably engaged between the inner walls of the distribution hopper 11 and near the bottom edge of the buffer cover 10. A rotating shaft 19 is provided in the middle of the support ring 17. Multiple vortex blades 18 are fixed at equal intervals between the inner wall of the support ring 17 and the outer surface of the rotating shaft 19. The bottom end of the rotating shaft 19 extends to the middle of the interior of the distribution hopper 11. Multiple bent rods 21 are fixed near the bottom of the outer surface of the rotating shaft 19. Scrapers 20 are fixed on both sides of the inner walls of the support ring 17 near the bottom edge. One side of each scraper 20 is in contact with the inner wall of the distribution hopper 11 and is located on the side of the filter port 28.

[0022] The effect achieved is that the fine carbon nanotube particles, along with the airflow, enter the buffer cover 10 through the bent pipe 8 and then enter the distribution hopper 11. When entering the distribution hopper 11, the airflow impacts the vortex blades 18, thereby driving the support ring 17 and the rotating shaft 19 to rotate synchronously. When the support ring 17 rotates, it will drive the scraper 20 to scrape off the larger carbon nanotube particles attached to the outer surface of the filter port 28, so that they fall into the cylindrical box 16 for collection. When the rotating shaft 19 rotates, it will drive the bent rod 21 to stir the carbon nanotube particles collected in the cylindrical box 16, causing them to rise. This causes the fine carbon nanotube particles accumulated inside to rise with the airflow to the filter port 28 for further filtration, thus improving the screening effect. During the screening process, the high-pressure pulse tube 13 is cut off by the inner sliding sleeve 29, and the side port 26 is connected to the annular cavity 25 through the through port 32. The fine carbon nanotube particles passing through the filter port 28, along with the airflow, enter the interior of the annular cavity 25, and then enter the annular cover 12 from the side port 26 and through port 32 on the annular cavity 25. Inside the annular cover 12, the airflow is filtered by the annular filter pad 27 and then discharged into the atmosphere from the annular grid ring 15. The fine carbon nanotube particles in the airflow are stored on the top of the annular filter pad 27 after being filtered by the annular filter pad 27. In actual use, the annular filter pad 27 is a precision filter pad with a bent and concave top. Therefore, when filtering fine carbon nanotube particles, the fine carbon nanotube particles will accumulate and slide towards the middle part. Filtering can also be done through both sides of the annular filter pad 27, which is not easy to clog. During subsequent collection, the annular grid ring 15 can be unscrewed from the annular cover 12 to remove the annular filter pad 27 and collect the fine carbon nanotube particles.

[0023] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 8 , Figure 9 and Figure 10 As shown, the return device includes a cylindrical box 16, which is slidably and sealed to the inner wall of the distribution hopper 11. The bottom end of the rotating shaft 19 and the bending rod 21 are both located inside the cylindrical box 16. The inner walls of both sides of the cylindrical box 16 are provided with discharge ports 37 that extend to the outside near the bottom edge. The inner wall of the distribution hopper 11 is located below the bottom of the cylindrical box 16 and is in an annular recess. The inner walls of both sides of the distribution hopper 11 are provided with cylindrical cavities 22. One side of each of the two cylindrical cavities 22 extends into the distribution hopper 11. Circular pieces 36 are slidably arranged between the inner walls of the two cylindrical cavities 22. One end of each of the two circular pieces 36 extends into the distribution hopper 11 and is fixed to the outer surface of the cylindrical box 16. Springs 35 are fixed to the bottom of each of the two circular pieces 36, and the bottom of each of the two springs 35 is fixed to the inner bottom surface of the cylindrical cavity 22.

[0024] The effect achieved is that, as larger carbon nanotube particles that do not meet the requirements accumulate inside the cylindrical box 16, the overall mass of the cylindrical box 16 increases, and it will gradually compress the spring 35 downward. When the maximum weight is reached, the discharge ports 37 on both sides of the cylindrical box 16 near the bottom can slide to the annular recess inside the distribution hopper 11. The larger carbon nanotube particles inside the cylindrical box 16 can then be discharged into the distribution hopper 11 through the discharge ports 37, and finally enter the fluidization tower 1 from the return pipe 9 for further refinement.

[0025] like Figure 4-10 As shown, the feedback device includes an inner sliding sleeve 29. An annular receiving opening 24 is provided inside the side wall of the distributing hopper 11. An annular cavity 23 is provided inside the side wall of the distributing hopper 11. The bottom of the annular receiving opening 24 extends to the top surface of the annular cavity 23. Multiple side openings 26, extending into the annular cover 12, are equidistantly provided along the circumferential direction near the bottom edge of the inner wall of the annular cavity 25. Each side opening 26 corresponds to and penetrates the annular receiving opening 24. A high-voltage pulse tube 13 is fixed to one outer surface of the distributing hopper 11 above the annular cover 12. The high-voltage pulse tube 13... One end extends into the annular cavity 25 and is located at the edge of the inner top surface. The high-voltage pulse tube 13 and the annular receiving port 24 are interconnected. The side port 26 is opposite to the filter port 28. The inner sliding sleeve 29 is slidably sealed inside the annular receiving port 24. A connecting hole 30 is opened on one side of the inner sliding sleeve 29 near the top edge. The connecting hole 30 is located directly above the high-voltage pulse tube 13. Multiple inner sealing plates 31 are fixed at equal intervals along the circumferential direction at the bottom of the inner sliding sleeve 29. The multiple inner sealing plates 31 are slidably sealed between the inner walls of the annular receiving port 24 and are all located on one side of the side port 26. Each of the multiple inner sealing plates 31 has a through-hole 32 on one side, which extends to the other side. The multiple through-holes 32 are connected to the side openings 26. The bottom of each of the multiple inner sealing plates 31 extends into the annular cavity 23. An annular piece 34 is slidably disposed between the inner walls of the annular cavity 23. The bottom of each of the multiple inner sealing plates 31 is fixed to the top of the annular piece 34. Guide rods 33 are fixed near the two side edges of the bottom of the annular piece 34. The bottom of each of the two guide rods 33 slides through into the cylindrical cavity 22 and is fixed to the top of the circular piece 36.

[0026] The effect is that when the cylindrical box 16 slides down, the circular plate 36 and the guide rod 33 simultaneously drive the annular plate 34 to slide downward. When the annular plate 34 slides downward, it drives the inner sealing plate 31 and the inner sliding sleeve 29 to slide downward simultaneously. When the discharge ports 37 on both sides of the cylindrical box 16 near the bottom slide to the annular recess inside the hopper 11 to discharge material, the through port 32 on the inner sealing plate 31 slides to below the side port 26, sealing the side port 26 through the inner sealing plate 31. At this time, the side port 26 is not open. At the same time, the connecting hole 30 on the inner sliding sleeve 29 slides to the height. At the opposite position of the high-pressure pulse tube 13, the high-pressure pulse tube 13 is turned on, and the high-pressure pulse gas enters the annular cavity 25 through the high-pressure pulse tube 13. Then, it enters the distribution hopper 11 from the inside of the annular cavity 25 through the other side of the filter port 28, backflushing the material blocking the filter port 28 to achieve the purpose of cleaning the filter port 28. At the same time, since the material in the cylindrical box 16 is discharged from the discharge port 37 into the distribution hopper 11 at this time, the material in the cylindrical box 16 can be pushed to the bottom under the pressure of the high-pressure pulse gas, which accelerates the material discharge rate.

[0027] Working principle: Inside the fluidized tower 1, fine carbon nanotube particles, along with the airflow, pass through the bent pipe 8 and enter the buffer shroud 10 before entering the distribution hopper 11. Upon entering the distribution hopper 11, the airflow impacts the vortex blades 18, causing the support ring 17 and the rotating shaft 19 to rotate synchronously. The rotation of the support ring 17 drives the scraper 20 to scrape off larger carbon nanotube particles adhering to the outer surface of the filter port 28, causing them to fall into the cylindrical box 16 for collection. The rotation of the rotating shaft 19 drives the bent rod 21 to stir the carbon nanotube particles collected in the cylindrical box 16, causing them to rise. This allows the accumulated fine carbon nanotube particles to rise with the airflow to the filter port 28 for further filtration, improving the screening effect. In the middle section, the high-voltage pulse tube 13 is cut off by the inner sliding sleeve 29, and the side port 26 is connected to the annular cavity 25 through the through port 32. The fine carbon nanotube particles passing through the filter port 28, along with the airflow, enter the interior of the annular cavity 25, and then enter the annular cover 12 from the side port 26 and through port 32 on the annular cavity 25. Inside the annular cover 12, the airflow is filtered by the annular filter pad 27 and then discharged into the atmosphere from the annular grid ring 15. The fine carbon nanotube particles in the airflow are filtered by the annular filter pad 27 and accumulate on the top of the annular filter pad 27 for storage. Larger carbon nanotube particles that do not meet the requirements accumulate inside the cylindrical box 16. As the overall mass of the cylindrical box 16 increases, it will gradually be compressed downwards. When the maximum weight is reached, the discharge ports 37 on both sides of the cylindrical box 16 near the bottom can slide to the annular recess inside the distribution hopper 11. Larger carbon nanotube particles inside the cylindrical box 16 can then be discharged through the discharge ports 37 into the distribution hopper 11, and finally enter the fluidization tower 1 through the return pipe 9 for further refining. The downward movement of the cylindrical box 16 will cause the annular plate 34 to slide downwards synchronously via the disc 36 and guide rod 33. As the annular plate 34 slides downwards, it will cause the inner sealing plate 31 and inner sliding sleeve 29 to slide downwards synchronously. When the discharge ports 37 on both sides of the cylindrical box 16 near the bottom slide to the annular recess inside the distribution hopper 11 for discharge, the through-hole 32 on the inner sealing plate 31 will slide to... Below the side opening 26, the inner sealing plate 31 seals the side opening 26, so the side opening 26 is not conductive. At the same time, the connecting hole 30 on the inner sliding sleeve 29 slides to the position opposite to the high-pressure pulse tube 13, so the high-pressure pulse tube 13 is conductive. The high-pressure pulse gas enters the annular cavity 25 through the high-pressure pulse tube 13, and then enters the distribution hopper 11 from the inside of the annular cavity 25 through the other side of the filter port 28, backflushing the material blocking the filter port 28 to achieve the purpose of cleaning the filter port 28. At the same time, since the material in the cylindrical box 16 is discharged from the discharge port 37 into the distribution hopper 11 at this time, the pressure of the high-pressure pulse gas can push the material in the cylindrical box 16 to the bottom, accelerating the material discharge rate.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fluidized bed-based carbon nanotube granulation and molding device, characterized in that, The fluidizing tower (1) is connected to a bent pipe (8) at its top. One end of the bent pipe (8) is connected to a buffer cover (10). A distribution hopper (11) is fixed at the bottom of the buffer cover (10). A return device is provided inside the distribution hopper (11). A return pipe (9) is connected to the bottom of the distribution hopper (11). The bottom end of the return pipe (9) is connected to the inside of the fluidizing tower (1). An annular cover (12) is fixed to the outside of the distribution hopper (11). A feedback device is provided inside the distribution hopper (11). An annular cavity (25) is opened inside the distribution hopper (11). Multiple filter ports (28) that penetrate into the annular cavity (25) are opened at equal intervals on the inner wall of the distribution hopper (11). The bottom of the annular cover (12) is open. An annular grid ring (15) is threaded between the inner walls of the annular cover (12). The inner wall of the annular grid ring (15) is slidably sealed to the outer surface of the distribution hopper (11). An annular filter pad (27) is provided on the top of the annular grid ring (15) inside the annular cover (12). A material leveling device is provided inside the distribution hopper (11).

2. The fluidized bed-based carbon nanotube granulation and molding device according to claim 1, characterized in that: The top of the buffer cover (10) is closed. An arc-shaped flow guide (14) is fixed inside the fluidizing tower (1) near the top edge. The bottom of the bent pipe (8) is connected to the top surface inside the arc-shaped flow guide (14). A fixing plate (42) is fixed between the inner walls of the fluidizing tower (1) near the bottom edge. A honeycomb partition (38) is fixed between the inner walls of the fluidizing tower (1) above the fixing plate (42).

3. The fluidized bed-based carbon nanotube granulation and molding device according to claim 1, characterized in that: The fluidizing tower (1) has multiple legs (2) fixed at equal intervals near the bottom edge on its outer surface. The bottom of the fluidizing tower (1) is connected to a bottom pipe (3). The top of the fixing plate (42) has multiple air distribution holes (39) that extend to the bottom at equal intervals. A filter cover (40) is provided between the tops of the multiple air distribution holes (39), and a filter plug (41) is provided between the bottoms of the multiple air distribution holes (39).

4. The fluidized bed-based carbon nanotube granulation and molding device according to claim 2, characterized in that: A heating jacket (6) is provided on the outer surface of the fluidizing tower (1) at the middle position. A temperature sensor (7) is provided on one side of the heating jacket (6). A side pipe (4) is fixedly connected above the honeycomb partition (38) on one side of the fluidizing tower (1). A carrier gas pipe (5) is fixedly connected below the heating jacket (6) on one side of the fluidizing tower (1).

5. The fluidized bed-based carbon nanotube granulation and molding device according to claim 1, characterized in that: The material leveling device includes a support ring (17), which is rotatably engaged between the inner walls of the distribution hopper (11) and near the bottom edge of the buffer cover (10). A rotating shaft (19) is provided in the middle of the support ring (17). Multiple vortex blades (18) are fixed at equal intervals between the inner wall of the support ring (17) and the outer surface of the rotating shaft (19). The bottom end of the rotating shaft (19) extends to the middle of the inside of the distribution hopper (11). Multiple bent rods (21) are fixed near the bottom of the outer surface of the rotating shaft (19). Scrapers (20) are fixed on both sides of the inner walls of the support ring (17) near the bottom edge. One side of each of the two scrapers (20) is in contact with the inner wall of the distribution hopper (11) and is located on the side of the filter port (28).

6. The fluidized bed-based carbon nanotube granulation and molding device according to claim 5, characterized in that: The return device includes a cylindrical box (16), which is slidably and sealed between the inner walls of the distribution hopper (11). The bottom end of the rotating shaft (19) and the bending rod (21) are both located inside the cylindrical box (16). The inner walls on both sides of the cylindrical box (16) are provided with discharge ports (37) that extend to the outside. The inner wall of the distribution hopper (11) is located below the bottom of the cylindrical box (16) and is in an annular recess. The inner walls on both sides of the distribution hopper (11) are provided with cylindrical cavities (22).

7. The fluidized bed-based carbon nanotube granulation and molding device according to claim 6, characterized in that: One side of each of the two cylindrical cavities (22) extends into the interior of the distribution hopper (11). A circular piece (36) is slidably disposed between the inner walls of the two cylindrical cavities (22). One end of each of the two circular pieces (36) extends into the distribution hopper (11) and is fixed on the outer surface of the cylindrical box (16). A spring (35) is fixed to the bottom of each of the two circular pieces (36), and the bottom of each of the two springs (35) is fixed to the inner bottom surface of the cylindrical cavity (22).

8. The fluidized bed-based carbon nanotube granulation and molding device according to claim 7, characterized in that: The feedback device includes an inner sliding sleeve (29), an annular receiving port (24) is provided inside the side wall of the distributing hopper (11), an annular cavity (23) is provided inside the side wall of the distributing hopper (11), the bottom of the annular receiving port (24) extends to the inner top surface of the annular cavity (23), and multiple side openings (26) extending into the annular cover (12) are provided at equal intervals along the circumferential direction near the bottom edge of the inner wall of the annular cavity (25), and the multiple side openings (26) are all connected to the annular receiving port (24).

9. A fluidized bed-based carbon nanotube granulation and molding device according to claim 8, characterized in that: A high-pressure pulse tube (13) is fixed on one side of the outer surface of the hopper (11) above the annular cover (12). One end of the high-pressure pulse tube (13) penetrates into the annular cavity (25) and is located at the edge of the inner top surface. The high-pressure pulse tube (13) and the annular receiving port (24) penetrate each other. The side opening (26) is opposite to the filter port (28). The inner sliding sleeve (29) is slidably sealed inside the annular receiving port (24). A connecting hole (30) is opened on one side of the inner sliding sleeve (29) near the top edge. The connecting hole (30) is located directly above the high-pressure pulse tube (13). Multiple inner sealing plates (31) are fixed at equal intervals along the circumferential direction at the bottom of the inner sliding sleeve (29). The multiple inner sealing plates (31) are slidably sealed between the inner walls of the annular receiving port (24) and are all located on the side of the side opening (26).

10. A fluidized bed-based carbon nanotube granulation and molding device according to claim 9, characterized in that: One side of each of the inner sealing plates (31) is provided with a through-hole (32) that extends to the other side. Each of the through-holes (32) is connected to the side opening (26). The bottom of each of the inner sealing plates (31) extends into the annular cavity (23). An annular piece (34) is slidably disposed between the inner walls of the annular cavity (23). The bottom of each of the inner sealing plates (31) is fixed to the top of the annular piece (34). Guide rods (33) are fixed near the two side edges of the bottom of the annular piece (34). The bottoms of the two guide rods (33) slide through into the cylindrical cavity (22) and are fixed to the top of the circular piece (36).

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