Heating and purifying equipment for graphene powder

Abstract

The invention relates to the technical field of graphene purification, and discloses a heating and purifying device for graphene powder, the heating and purifying device comprises a heating furnace body, the side face of the heating furnace body is communicated with a preheating bin, the top and the side face of the preheating bin are communicated with a discharging hopper and an air blower respectively, and a heating bin is rotatably arranged in the heating furnace body; a gear ring is fixedly connected to the outer portion of the heating bin, a first gear is meshed with the bottom of the gear ring, an output shaft of a driving motor is fixedly connected to the axis of the first gear, hot air in the hot furnace body enters the air bag to be stored through the air guide valve, and when the heating bin rotates, the stirring plate pushes the gun handle frame, and the arc-shaped piece extrudes the compression shaft through a transmission structure; the compressed air bag enables hot air to return to the preheating bin through the air guide pipe and the conveying pipe to recycle waste heat, powder containing water is preheated, and the situation that the powder directly enters the heating bin to be heated, impacted and damaged is avoided.

Description

Technical Field

[0001] This invention relates to the field of graphene purification technology, specifically to a heating purification device for graphene powder. Background Technology

[0002] Graphene powder refers to graphene materials that exist in powder form. It is composed of a single layer or a few layers of graphene sheets. It combines the excellent properties of graphene with the easy dispersibility and processing characteristics of powder materials, and is one of the most widely used forms of graphene in industrial applications.

[0003] Chinese patent CN211770321U discloses a stable and efficient high-temperature graphene purification device. By adding a feeding mechanism at the input end of the heating furnace, during the high-temperature purification of graphene, a servo motor drives the conveying auger to rotate and transport the graphene powder raw material, which facilitates the control of the feeding speed of the graphene powder raw material. The graphene powder raw material is introduced into the feeding chamber through the conveying auger. At this time, the blower blows the graphene powder raw material into the heating furnace, thereby making the graphene powder raw material fully combusted and removing impurities from the graphene powder raw material, which effectively ensures the accuracy of graphene purification.

[0004] In the above technical solutions, the powder is conveyed by blowing it with a blower. However, this method is not convenient for conveying powder containing moisture. Because the moisture-containing powder has high humidity and low surface temperature, it is easy to cause temperature imbalance when it is directly conveyed into the heating furnace without preheating. This can easily lead to the breakage of graphene sheets due to thermal shock, which is inconvenient for subsequent purification. Therefore, we propose a heating and purification device for graphene powder to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a heating and purification device for graphene powder, thereby solving the problems mentioned in the background art. To achieve the above objective, this invention provides the following technical solution: It includes a furnace body, a preheating chamber connected to the side of the furnace body, a feeding hopper and a blower connected to the top and side of the preheating chamber respectively, a heating chamber rotatably disposed inside the furnace body, a gear ring fixedly connected to the outside of the heating chamber, a first gear meshing at the bottom of the gear ring, and an output shaft of a drive motor fixedly connected to the axis of the first gear;

[0006] A pressure roller is fixedly connected to the front side of the shaft of the heating chamber;

[0007] A filter valve is provided on the upper part of the inner wall of the hot furnace. The output end of the filter valve is connected to an air bladder. The top of the air bladder is connected to a gas guide pipe. The end of the gas guide pipe away from the air bladder is connected to a transmission pipe.

[0008] The end of the transmission pipe away from the air guide pipe is located at the top of the preheating chamber and is connected to its interior. A dispersant chamber is connected to the side wall of the section of the transmission pipe near the preheating chamber. A feeding valve is provided at the bottom of the dispersant chamber.

[0009] Mounting plates are fixedly installed on both sides of the top of the furnace body. A bent strip is hinged at the center of one of the mounting plates. One end of the bent strip is fixedly connected to one end of a compression shaft. The compression shaft is slidably mounted on the mounting plate. There are four compression shafts, which are arranged in a ring relative to the airbag.

[0010] Preferably, a worm gear is rotatably mounted on the surface of one of the mounting plates, and a plurality of arc-shaped pieces adapted to the compression shaft are fixedly mounted on the inner wall of the worm gear, with the surface of the arc-shaped pieces abutting against the compression shaft.

[0011] Preferably, a worm is engaged at the bottom of the worm gear, and a second gear is fixedly connected to the axis of the worm. Both the second gear and the worm are rotatably connected to the furnace body. A rack is engaged at the bottom of the second gear, and a gun handle holder is fixedly connected to the bottom of the rack. The gun handle holder is slidably and elastically connected to the furnace body.

[0012] Preferably, a lever is fixedly connected to one side of the outer wall of the heating chamber, and the surface of the lever abuts against the surface of the gun handle holder.

[0013] Preferably, the heating chamber has symmetrically arranged inner cavities, and a plurality of material distribution baffles fixedly connected to the heating chamber are equidistantly arranged in the inner cavities. A first sealing plate and a second sealing plate are respectively arranged on the outside of the two inner cavities, and the first sealing plate and the second sealing plate are slidably connected to the heating chamber.

[0014] Preferably, a discharge control valve is provided on one side of the furnace body relative to the preheating chamber, and the discharge control valve is connected to the material box.

[0015] Preferably, the inside of the material bin is equipped with a condenser and an electromagnetic plate.

[0016] Preferably, an adsorption bed is provided inside the transmission tube.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. In this invention, the hot gas inside the furnace enters the air bag for storage through the air guide valve. When the heating chamber rotates, the paddle pushes the gun handle frame. Through the transmission structure, the arc-shaped plate squeezes the compression shaft. The compressed air bag returns the hot gas to the preheating chamber through the air guide pipe and the transmission pipe to recover the residual heat and preheat the powder containing moisture to prevent it from being damaged by thermal shock when it directly enters the heating chamber.

[0019] 2. In this invention, after purification is completed, the sealing plate of the inner cavity is opened, the powder enters the material box through the discharge control valve, is cooled by the condenser, and the electromagnetic plate adsorbs the residual ferromagnetic impurities to further improve the purity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the furnace body of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged structural diagram of region A in the middle;

[0023] Figure 4 This is a side sectional view of the furnace body of the present invention;

[0024] Figure 5 This is a schematic diagram of the heating chamber of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of the material box of the present invention;

[0026] Figure 7 This is a cross-sectional structural diagram of the transmission tube of the present invention.

[0027] In the diagram: 1. Furnace body; 2. Preheating chamber; 3. Feed hopper; 4. Blower; 5. Heating chamber; 6. Gear ring; 7. Drive motor; 8. First gear; 9. Pressure roller; 10. Filter valve; 11. Air bag; 12. Air guide pipe; 13. Transmission pipe; 14. Dispersant bin; 15. Feeding valve; 16. Mounting plate; 17. Bending strip; 18. Compression shaft; 19. Worm gear; 20. Arc-shaped plate; 21. Worm; 22. Second gear; 23. Rack; 24. Gun handle holder; 25. Paddle plate; 26. Inner cavity; 27. Distributor baffle; 28. First sealing plate; 29. ​​Second sealing plate; 30. Adsorption bed; 31. Discharge control valve; 32. Material box; 33. Condenser; 34. Electromagnetic plate. Detailed Implementation

[0028] 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.

[0029] Please see Figures 1 to 7The present invention provides a technical solution: including a furnace body 1, a preheating chamber 2 connected to the side of the furnace body 1, a feeding hopper 3 and a blower 4 respectively connected to the top and side of the preheating chamber 2, a heating chamber 5 rotatably arranged inside the furnace body 1, a gear ring 6 fixedly connected to the outside of the heating chamber 5, a first gear 8 meshing at the bottom of the gear ring 6, and the output shaft of a drive motor 7 fixedly connected to the axis of the first gear 8;

[0030] A pressure roller 9 is fixedly connected to the front side of the shaft of the heating chamber 5;

[0031] A filter valve 10 is provided on the upper part of the inner wall of the furnace body 1. The output end of the filter valve 10 is connected to an air bag 11. The top of the air bag 11 is connected to a gas guide pipe 12. The end of the gas guide pipe 12 away from the air bag 11 is connected to a transmission pipe 13.

[0032] The end of the transmission pipe 13 away from the air guide pipe 12 is located at the top of the preheating chamber 2 and is connected to its interior. The side wall of the transmission pipe 13 near the preheating chamber 2 is connected to the dispersant hopper 14, and the bottom of the dispersant hopper 14 is provided with a feeding valve 15.

[0033] Mounting plates 16 are fixedly installed on both sides of the top of the furnace body 1. A bent strip 17 is hinged at the center of one of the mounting plates 16. One end of the bent strip 17 is fixedly connected to one end of a compression shaft 18. The compression shaft 18 is slidably installed on the mounting plate 16. There are four compression shafts 18, which are arranged in a ring relative to the air bag 11.

[0034] A worm gear 19 is rotatably mounted on the surface of the mounting plate 16 on one side. Several arc-shaped pieces 20 adapted to the compression shaft 18 are fixedly mounted on the inner wall of the worm gear 19. The surface of the arc-shaped pieces 20 abuts against the compression shaft 18.

[0035] The bottom of the worm gear 19 is engaged with a worm 21, and a second gear 22 is fixedly connected to the shaft of the worm 21. Both the second gear 22 and the worm 21 are rotatably connected to the furnace body 1. The bottom of the second gear 22 is engaged with a rack 23, and the bottom of the rack 23 is fixedly connected to a gun handle holder 24. The gun handle holder 24 is slidably and elastically connected to the furnace body 1.

[0036] A lever 25 is fixedly connected to one side of the outer wall of the heating chamber 5, and the surface of the lever 25 abuts against the surface of the gun handle 24.

[0037] An adsorption bed 30 is provided inside the transmission pipe 13;

[0038] In this embodiment, the graphene powder to be purified enters the preheating chamber 2 from the hopper 3. At the same time, the blower 4 blows air into the preheating chamber 2 to initially disperse the powder. Part of the residual heat in the furnace body 1 is introduced into the preheating chamber 2 through the transmission pipe 13 to preheat the powder and remove moisture, low-boiling-point organic matter and other volatile impurities. The dispersant chamber 14 feeds a dispersant, such as a small amount of dispersant, into the transmission pipe 13 through the feeding valve 15. The dispersant enters the preheating chamber 2 with the hot air flow to further break up the powder agglomeration. When the residual hot air flow enters the transmission pipe 13, it passes through the adsorption bed 30. Water vapor is captured by the micropores of the adsorbent, and low-boiling-point organic matter is also captured. The dry gas is discharged back into the preheating chamber 2. The dispersant reacts fully in the heating chamber 5 and will not enter the air bag 11.

[0039] In this embodiment, the drive motor 7 starts and drives the heating chamber 5 to rotate at a constant speed in the furnace body 1 through the meshing transmission of the first gear 8 and the gear ring 6. The preheated powder is blown into the heating chamber 5 from the preheating chamber 2 by the blower 4. During the rotation, the first sealing plate 28 in one of the inner cavities 26 opens and the powder enters the inner cavity 26. The powder is evenly distributed into the inner cavity 26 by the material distribution baffle 27 to avoid local accumulation and ensure uniform heating. The furnace body 1 heats the heating chamber 5 at a high temperature, which is adjusted according to the type of impurities. The removal of metal catalysts requires 800-1200℃. Metal impurities in the powder, such as iron and nickel, volatilize or oxidize, and carbon-based impurities such as amorphous carbon are decomposed. At the same time, the pressure roller 9 at the shaft of the heating chamber 5 rotates synchronously with the chamber body to crush the agglomerated particles in the preheating chamber 2, increase the heating area for subsequent purification, and ensure that impurities are fully removed.

[0040] In this embodiment, some of the high-temperature hot air inside the furnace body 1 enters the airbag 11 through the air guide valve 10. The airbag 11 temporarily stores the hot air, serving as a buffer and energy storage function. When the heating chamber 5 rotates, the lever 25 on its outer wall rotates synchronously with the chamber body. When it approaches the gun handle 24, it contacts the surface of the gun handle 24 and pushes the gun handle 24. The gun handle 24 drives the top rack 23 to slide to one side. The rack 23 meshes with the second gear 22, driving the second gear 22 and the coaxial worm gear 2. 1. Rotation occurs; worm 21 meshes with worm wheel 19, driving worm wheel 19 to rotate. The arc-shaped plate 20 on the inner wall of worm wheel 19 rotates with worm wheel 19, squeezing compression shaft 18. Compression shaft 18, under the squeezing of arc-shaped plate 20, drives bent bar 17 to swing. Bent bar 17 squeezes airbag 11, compressing the annularly distributed airbag 11. The hot air in airbag 11 is squeezed out and flows back to preheating chamber 2 through air guide pipe 12 and transmission pipe 13, realizing waste heat recovery and reducing heat waste.

[0041] In this embodiment, the dispersant can dissociate agglomerated particles into finer monodisperse or small-diameter aggregates through dispersion, ensuring that the powder particles are heated evenly during subsequent heating and that impurities can be fully removed. One end of the dispersant molecule can be adsorbed on the surface of the graphene powder, and the attraction between particles can be offset by charge repulsion or steric hindrance, thus preventing agglomeration. In the equipment, the dispersant enters the preheating chamber with the waste heat airflow of the hot furnace body. With the help of the airflow disturbance, it comes into full contact with the powder and diffuses rapidly, further enhancing the dispersion effect and providing a uniform heating basis for the high-temperature purification in the subsequent heating chamber 5, avoiding local impurity residue caused by agglomeration.

[0042] Please see Figures 1 to 7 The present invention provides a technical solution: the heating chamber 5 is symmetrically provided with an inner cavity 26, and a plurality of material distribution baffles 27 fixedly connected to the heating chamber 5 are equidistantly provided at the inner cavity 26. A first sealing plate 28 and a second sealing plate 29 are respectively provided on the outside of the two inner cavities 26, and the first sealing plate 28 and the second sealing plate 29 are slidably connected to the heating chamber 5 respectively.

[0043] A discharge control valve 31 is provided on one side of the furnace body 1 relative to the preheating chamber 2, and the discharge control valve 31 is connected to the material box 32;

[0044] The inside of the material bin 32 is equipped with a condenser 33 and an electromagnetic plate 34.

[0045] In this embodiment, after the heating and purification are completed, the heating chamber 5 drives the inner cavity 26 on one side to rotate to the top, and one of the first sealing plate 28 and the second sealing plate 29 automatically opens, exposing the outlet of the inner cavity 26. The purified powder enters the material box 32 through the discharge control valve 31 on the side of the furnace body 1.

[0046] In this embodiment, the condenser 33 inside the material box 32 is activated to cool the powder through cold airflow or cooling wall surface to avoid high-temperature oxidation; at the same time, the electromagnetic plate 34 is energized to generate a magnetic field, which adsorbs residual ferromagnetic metal impurities in the powder, such as incompletely volatilized nickel and iron particles, to further improve the purity.

[0047] The method of use and advantages of this invention: This heating and purification equipment for graphene powder operates as follows:

[0048] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown:

[0049] S1: Graphene powder enters the preheating chamber 2 from the feed hopper 3. The blower 4 blows air to disperse the powder. The residual heat of the hot furnace body 1 is introduced into the preheating chamber 2 through the transmission pipe 13 for preheating and impurity removal. The dispersing agent chamber 14 is also added through the transmission pipe 13 to further disperse the agglomerates.

[0050] S2: Drive motor 7 drives heating chamber 5 to rotate. After preheating, powder enters the inner cavity 26 of heating chamber 5. Distributor baffle 27 makes the powder evenly distributed. The furnace body 1 is heated at high temperature to remove metal and carbon-based impurities. The pressure roller 9 is driven synchronously when heating chamber 5 rotates to crush and break up the agglomerated particles in the preheating chamber.

[0051] S3: Hot gas from the furnace body 1 enters the air bag 11 for storage via the air guide valve 10. When the heating chamber 5 rotates, the lever 25 pushes the gun handle 24, which is driven by the rack 23, gear, worm 21, and worm wheel 19, causing the arc-shaped plate 20 to squeeze the compression shaft 18. The compressed air bag 11 returns the hot gas to the preheating chamber 2 through the air guide pipe 12 and the transmission pipe 13 to recover the waste heat.

[0052] S4: After purification, the sealing plate of the inner cavity 26 is opened, and the powder enters the material box 32 through the discharge control valve 31. After being cooled by the condenser 33, the electromagnetic plate 34 adsorbs the residual ferromagnetic impurities, thereby improving the purity.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heating and purification device for graphene powder, characterized in that, The furnace includes a furnace body (1), a preheating chamber (2) connected to the side of the furnace body (1), a feeding hopper (3) and a blower (4) connected to the top and side of the preheating chamber (2) respectively, a heating chamber (5) is rotatably arranged inside the furnace body (1), a gear ring (6) is fixedly connected to the outside of the heating chamber (5), a first gear (8) is meshed at the bottom of the gear ring (6), and the output shaft of a drive motor (7) is fixedly connected to the shaft of the first gear (8). A pressure roller (9) is fixedly connected to the front side of the shaft of the heating chamber (5); A filter valve (10) is provided on the upper part of the inner wall of the furnace body (1). The output end of the filter valve (10) is connected to an air bag (11). The top of the air bag (11) is connected to a gas guide pipe (12). The end of the gas guide pipe (12) away from the air bag (11) is connected to a transmission pipe (13). The end of the transmission pipe (13) away from the air guide pipe (12) is located at the top of the preheating chamber (2) and is connected to its interior. A dispersant chamber (14) is connected to the side wall of the transmission pipe (13) near the preheating chamber (2). A feeding valve (15) is provided at the bottom of the dispersant chamber (14). Mounting plates (16) are fixedly installed on both sides of the top of the furnace body (1). A bent strip (17) is hinged at the center of one of the mounting plates (16). The other end of the bent strip (17) is fixedly connected to one end of a compression shaft (18). The compression shaft (18) is slidably installed on the mounting plate (16). There are four compression shafts (18), which are arranged in a ring relative to the airbag (11).

2. The heating and purification equipment for graphene powder according to claim 1, characterized in that: One side of the mounting plate (16) has a worm gear (19) rotatably mounted on its surface. Several arc-shaped pieces (20) adapted to the compression shaft (18) are fixedly mounted on the inner wall of the worm gear (19). The surface of the arc-shaped pieces (20) abuts against the compression shaft (18).

3. The heating and purification equipment for graphene powder according to claim 2, characterized in that: The bottom of the worm gear (19) is engaged with a worm (21), and a second gear (22) is fixedly connected to the axis of the worm (21). The second gear (22) and the worm (21) are rotatably connected to the furnace body (1). The bottom of the second gear (22) is engaged with a rack (23), and the bottom of the rack (23) is fixedly connected with a gun handle holder (24). The gun handle holder (24) is slidably and elastically connected to the furnace body (1).

4. The heating and purification equipment for graphene powder according to claim 1, characterized in that: A lever (25) is fixedly connected to one side of the outer wall of the heating chamber (5), and the surface of the lever (25) abuts against the surface of the gun handle (24).

5. The heating and purification equipment for graphene powder according to claim 4, characterized in that: The heating chamber (5) is symmetrically provided with an inner cavity (26). Several material distribution baffles (27) fixedly connected to the heating chamber (5) are provided at equal intervals in the inner cavity (26). A first sealing plate (28) and a second sealing plate (29) are respectively provided on the outside of the two inner cavities (26). The first sealing plate (28) and the second sealing plate (29) are slidably connected to the heating chamber (5).

6. The heating and purification equipment for graphene powder according to claim 1, characterized in that: A discharge control valve (31) is provided on one side of the furnace body (1) relative to the preheating chamber (2), and the discharge control valve (31) is connected to the material box (32).

7. The heating and purification equipment for graphene powder according to claim 6, characterized in that: The hopper (32) is equipped with a condenser (33) and an electromagnetic plate (34).

8. The heating and purification equipment for graphene powder according to claim 1, characterized in that: An adsorption bed (30) is provided inside the transmission tube (13).

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