Graphene production process

Abstract

The invention relates to the field of graphene production, and particularly discloses a graphene production process which is characterized in that during crushing, an integrated crushing and screening device is adopted, and crushed graphite powder is rotationally screened through a rotary screen drum, so that raw materials fully roll on the surface of the screen drum; the problem of blockage caused by the fact that raw materials are easily accumulated on the surface during screening of a transmission vibrating screen plate is solved, and the effective screening area and the screening efficiency are improved through rotary screening; meanwhile, through a blowing cover arranged between the screen drum and the outer drum, annular airflow is formed on the outer side of the screen drum, graphite powder is accelerated to be discharged from the screen drum, blowing cleaning is conducted on the outer wall of the screen drum and the inner wall of the outer drum, residual graphite powder is reduced, and the yield of the graphite powder is increased; and through the second air inlet pipe communicated with the feeding pipe and the scraping plate with the side blowing holes, raw material residues during feeding are reduced, adhesion of raw material powder and equipment during discharging is reduced, and the graphite powder collecting effect is further improved.

Description

Technical Field

[0001] The present invention relates to the field of graphene production, and more particularly to a graphene production process. Background Art

[0002] The redox production process of graphene achieves large-scale preparation through chemical conversion. First, natural flake graphite is selected and dried for pretreatment, then intercalated with a strong oxidant to form graphite oxide. Then, graphene oxide dispersion is obtained through ultrasonic or chemical exfoliation. Finally, a reducing agent or high-temperature treatment is used to remove oxygen-containing groups and repair the conjugated structure to obtain graphene.

[0003] In the redox production process of graphene, the pretreatment of natural flake graphite includes three key processes: crushing, grading and screening, and drying. The traditional process system has the following technical bottlenecks: First, the crushing and screening operations need to be completed step by step by independent equipment, and there is a lack of coordination between the equipment; second, conventional screening devices mostly use a vibrating screen plate structure. With continuous operation, large-sized graphite particles that are not completely crushed will gradually accumulate on the surface of the screen plate. These retained particles not only cause the screen holes to become clogged, but also cause the effective screening area to gradually decay. In order to maintain production continuity, operators need to frequently stop the machine for manual cleaning and re-enter the retained large-particle materials into the crushing system. This discontinuous operation mode significantly increases the process complexity and labor costs, becoming a key technical obstacle to improving production efficiency. Summary of the Invention

[0004] Technical problems to be solved In view of the problems existing in the prior art, the object of the present invention is to provide a graphene production process that can realize continuous screening of a screening device.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A graphene production process comprises the following steps: Step 1: pretreatment: crushing, screening and drying natural flake graphite to obtain pretreated graphite powder; Step 2: oxidation: putting the pretreated graphite powder into a reactor and adding a strong acid mixture and an oxidant to carry out an oxidation reaction; Step three, stripping: putting the graphite oxide into an ultrasonic cleaner and adding deionized water solvent to perform a stripping operation to obtain an oxidized slurry; Step 4: reduction: putting the oxidized slurry and the reducing agent into a hydrothermal reactor to carry out a reduction reaction to obtain graphene; In step 1, an integrated crushing and screening device is used to crush and screen the natural flake graphite. The integrated crushing and screening device includes an outer cylinder fixedly connected to a base, a fixed cylinder fixedly connected to the center position of the outer cylinder, a crushing channel running through the fixed cylinder, a crushing knife roller connected to a second motor is provided in the crushing channel, a feed pipe extending to the outside of the outer cylinder is fixedly connected to the outer end of the feed pipe, and a spiral conveying roller connected to the first motor is provided inside the feed pipe; The outer cylinder is located outside the fixed cylinder and is rotatably connected to the screen cylinder, and the screen cylinder is connected to a third motor that drives it to rotate; the inner side of the screen cylinder is fixedly connected to a scraper that slides against the fixed cylinder, and the upper end opening of the crushing channel is located at the upper end of the fixed cylinder; an annular gap is formed between the screen cylinder and the outer cylinder, and the lower part of the outer cylinder is fixedly connected to a discharge hood that is tangentially connected to it, and the side of the annular gap close to the discharge hood is fixedly connected to a blowing hood that slides against the screen cylinder, and the blowing hood is connected to the air supply mechanism.

[0007] As a further solution of the present invention: the air supply mechanism includes a discharge pipe fixedly connected to the discharge hood, the outer end of the discharge pipe is fixedly connected to the cyclone settling cylinder, the center position of the cyclone settling cylinder is fixedly connected to the central exhaust pipe, the upper end of the central exhaust pipe is fixedly connected to the blower, and the inside of the blower is fixedly connected to a fan; the air outlet end of the blower is fixedly connected to an air intake main pipe, and the air intake main pipe is connected to the blowing hood through a first air intake pipe.

[0008] As a further solution of the present invention: a blanking cover is fixedly connected to the inner side of the upper end of the crushing channel, the lower part of the blanking cover is a conical cylindrical structure with an open lower end, and the feed pipe is arranged opposite to the outer wall of the blanking cover; the outer end of the feed pipe is fixedly connected to a second air intake pipe, and the second air intake pipe is fixedly connected to the air intake main pipe; a first electromagnetic flow valve is fixedly connected to the connection point between the first air intake pipe and the air intake main pipe, and a second electromagnetic flow valve is fixedly connected to the connection point between the second air intake pipe and the air intake main pipe, and the first electromagnetic flow valve and the second electromagnetic flow valve are both electrically connected to the same controller.

[0009] As a further solution of the present invention: a side channel and a side blowing hole connected to the side channel are opened in the scraper, the airflow blown by the side blowing hole is used to blow the outer wall of the fixed cylinder and the inner wall of the outer cylinder, a connecting channel connected to the side channel is opened in the screen cylinder, the side wall of the screen cylinder is fixedly connected to a rotating ring, the rotating ring is rotatably nested in the shell wall of the outer cylinder, the outer cylinder is opened with an annular air cavity for the rotating ring to rotate, the annular air cavity is fixedly connected to a third air inlet pipe, and the third air inlet pipe is fixedly connected to the air intake main pipe.

[0010] As a further solution of the present invention: the sieve drum is a cylindrical structure with openings at both ends, and its circumferential side wall is provided with evenly distributed sieve holes; the side wall of the sieve drum is fixedly connected to a gear ring that is rotatably nested in the outer cylinder shell wall, and the output shaft of the third motor is fixedly connected to a drive gear that is rotatably nested in the outer cylinder shell wall, and the drive gear is engaged with the gear ring.

[0011] As a further solution of the present invention: the number of the crushing knife rollers is not less than two, the crushing knife rollers extend to the outside of the outer cylinder and adjacent crushing knife rollers are engaged through transmission gears, and one of the crushing knife rollers is connected to the output shaft of the second motor through a coupling.

[0012] As a further solution of the present invention: the lower end opening of the crushing channel is located at the lower part of the fixed cylinder, the blowing hood is a long strip structure with a fan-shaped cross section, and the blowing hood is provided with linearly equidistantly distributed longitudinal blowing holes.

[0013] As a further solution of the present invention: a third electromagnetic flow valve is fixedly connected to the connection point between the third intake pipe and the intake manifold, and the third electromagnetic flow valve is electrically connected to the controller.

[0014] As a further solution of the present invention: an ionizer is fixedly connected to the blower, and the ionizer is used to ionize the circulating airflow to generate ion wind.

[0015] Compared with the prior art, the advantages of the present invention are: (1) The present invention provides a rotating screen drum to perform rotary screening on the crushed graphite powder, so that the raw materials can fully roll on the surface of the screen drum, thereby overcoming the problem of blockage caused by accumulation of raw materials on the surface of the transmission vibration screen plate during screening. In addition, the rotary screening increases the effective screening area and improves the screening efficiency.

[0016] (2) The present invention forms an annular airflow outside the sieve cylinder by setting a blowing hood between the sieve cylinder and the outer cylinder, thereby accelerating the discharge of graphite powder from the sieve cylinder and blowing and cleaning the graphite powder adhering to the outer wall of the sieve cylinder and the inner wall of the outer cylinder, thereby reducing the residual graphite powder and improving the yield of graphite powder.

[0017] (3) The present invention reduces the residual raw materials during feeding by means of a second air inlet pipe connected to the feed pipe and a blanking cover arranged on the upper part of the pulverizing channel, generates a vortex in the pulverizing channel, improves the contact uniformity between the raw materials and the pulverizing roller, and improves the pulverizing efficiency; in addition, the air flow entering the pulverizing channel blows the pulverizing roller, the inner wall of the pulverizing channel and the inner wall of the screen drum, further improving the cleaning effect of the sticky powder.

[0018] (4) The present invention uses the side blowing holes provided on the scraper to blow air onto the outer wall of the fixed cylinder, the inner wall of the blanking cover and the inner wall of the outer cylinder, thereby improving the yield of graphite powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a process flow chart of the present invention; Figure 2 It is a schematic diagram of the three-dimensional structure of the integrated crushing and screening device of the present invention; Figure 3Schematic diagram of the longitudinal cross-sectional structure of the outer cylinder in the present invention; Figure 4 for Figure 3 Schematic diagram of the enlarged structure at A in the middle; Figure 5 Schematic diagram of the internal structure of the integrated crushing and screening device of the present invention; Figure 6 This is a schematic diagram of the assembly structure of the fixed cylinder in the present invention; Figure 7 Schematic diagram of the assembly structure of the screen drum in the present invention; Figure 8 Schematic diagram of the three-dimensional structure of the spray hood in the present invention; Figure 9 Schematic diagram of the pipe connection of the blower in the present invention; Figure 10 Schematic diagram of the flow of airflow and graphite powder; Figure 11 The schematic diagram of the scraper feeding unqualified graphite particles in a circular manner; Figure 12 for Figure 3 Schematic diagram of the enlarged structure at B in the middle; Figure 13 Schematic diagram of the three-dimensional structure of the scraper in the present invention; Figure 14 Schematic diagram of the internal structure of the scraper in the present invention.

[0020] Explanation of the reference numerals in the figure: 1. outer cylinder; 101. annular air cavity; 2. fixed cylinder; 201. crushing channel; 3. feeding pipe; 4. feeding hopper; 5. spiral conveying roller; 6. first motor; 7. crushing knife roller; 8. second motor; 9. blanking cover; 10. screen cylinder; 1001. connecting channel; 11. scraper; 1101. side channel; 1102. side blowing hole; 12. gear ring; 13. driving gear; 14. third motor Machine; 15. Discharge hood; 16. Discharge pipe; 17. Cyclone settling tube; 18. Central exhaust pipe; 19. Blower; 20. Fan; 21. Ionizer; 22. Air intake manifold; 23. Spray hood; 2301. Longitudinal spray hole; 24. First air intake pipe; 25. First electromagnetic flow valve; 26. Second air intake pipe; 27. Second electromagnetic flow valve; 28. Rotating ring; 29. Third air intake pipe; 30. Third electromagnetic flow valve. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0024] See also Figure 1-11 In one embodiment of the present invention, a graphene production process includes the following steps: Step 1: pretreatment: crushing, screening and drying natural flake graphite to obtain pretreated graphite powder; Step 2: oxidation: putting the pretreated graphite powder into a reactor and adding a strong acid mixture and an oxidant to carry out an oxidation reaction; Specifically, the strong acid mixture is a mixture of concentrated sulfuric acid and fuming nitric acid in a volume ratio of nine to one, and the oxidant is potassium permanganate, to obtain graphite oxide; Step three, stripping: putting the graphite oxide into an ultrasonic cleaner and adding deionized water solvent to perform a stripping operation to obtain an oxidized slurry; Step 4: reduction: putting the oxidized slurry and the reducing agent into a hydrothermal reactor to carry out a reduction reaction to obtain graphene; See also Figure 3In step 1, an integrated crushing and screening device is used to crush and screen the natural flake graphite. The integrated crushing and screening device includes an outer cylinder 1 fixedly connected to a base, a fixed cylinder 2 fixedly connected to the center position of the outer cylinder 1, a crushing channel 201 running through the fixed cylinder 2 is provided, a crushing knife roller 7 connected to a second motor 8 is provided in the crushing channel 201, and a feed pipe 3 extending to the outside of the outer cylinder 1 is fixedly connected to the outer end of the feed pipe 3. A feeding hopper 4 is fixedly connected to the outer end of the feed pipe 3, and a spiral conveying roller 5 connected to a first motor 6 is provided inside the feed pipe 3; See also Figure 3 and Figure 4 The outer cylinder 1 is located outside the fixed cylinder 2 and is rotatably connected to the screen cylinder 10. The screen cylinder 10 is connected to a third motor 14 that drives it to rotate; the inner side of the screen cylinder 10 is fixedly connected to a scraper 11 that slides in contact with the fixed cylinder 2. The upper end opening of the crushing channel 201 is located at the upper end of the fixed cylinder 2. When the screen cylinder 10 drives the scraper 11 to make a circular motion, the graphite powder that falls into the screen cylinder 10 is rotated and screened. At the same time, the unqualified large particles retained by the screen cylinder 10 are pushed to the top of the fixed cylinder 2 and then fall into the crushing channel 201 for re-crushing in the crushing channel 201; an annular gap is enclosed between the screen cylinder 10 and the outer cylinder 1, and a discharge hood 15 is fixedly connected to the lower part of the outer cylinder 1 and is tangentially connected to it. A blowing hood 23 that slides in contact with the screen cylinder 10 is fixedly connected to the side of the annular gap near the discharge hood 15, and the blowing hood 23 is connected to the air supply mechanism.

[0025] Specifically, when crushing and screening natural flake graphite, first, the material is fed through the feeding hopper 4, and the spiral conveying roller 5 of the feeding pipe 3 injects the raw material into the crushing channel 201 of the fixed cylinder 2. After the crushing knife roller 7 crushes the raw material, the crushed raw material falls into the screen drum 10 along the crushing channel 201; second, the rotating screen drum 10 drives the crushed raw material to rotate, and performs rotation screening. The screened raw material enters the annular gap and is discharged from the discharge cover 15; the trapped large particle raw material enters the crushing channel 201 again under the push of the scraper 11, and the raw material is circulated and crushed; third, the external air supply mechanism injects the airflow into the blowing hood 23, and then sprays from the inside of the blowing hood 23 to blow the annular gap, so that an annular airflow is formed between the screen drum 10 and the outer cylinder 1, accelerating the ejection of the screened raw material and reducing the adhesion of the raw material to the outer wall of the outer cylinder 1 and the screen drum 10.

[0026] Compared with the traditional graphite pretreatment device, the present invention is provided with a rotating screen drum 10 to perform rotational screening on the crushed graphite powder, so that the raw material can fully roll on the surface of the screen drum 10, overcoming the problem of blockage caused by accumulation of raw materials on the surface during transmission vibration screen screening. In addition, the rotational screening increases the effective screening area and improves the screening efficiency. At the same time, through the blowing hood 23 arranged between the screen drum 10 and the outer cylinder 1, an annular airflow is formed on the outside of the screen drum 10, which accelerates the discharge of graphite powder from the screen drum 10, and the particles stuck on the outer wall of the screen drum 10 and the inner wall of the outer cylinder 1 are blown and cleaned, thereby reducing the residual graphite powder and improving the yield of the graphite powder.

[0027] See also Figure 4 and Figure 7 The sieve drum 10 is a cylindrical structure with openings at both ends, and its circumferential side wall is provided with evenly distributed sieve holes; the side wall of the sieve drum 10 is fixedly connected to a gear ring 12 that is rotatably nested in the shell wall of the outer cylinder 1, and the output shaft of the third motor 14 is fixedly connected to a drive gear 13 that is rotatably nested in the shell wall of the outer cylinder 1, and the drive gear 13 is engaged with the gear ring 12.

[0028] Specifically, the third motor 14 drives the driving gear 13 to rotate, and the driving gear 13 drives the gear ring 12 to rotate.

[0029] See also Figure 6 The number of the crushing knife rollers 7 is not less than two, the crushing knife rollers 7 extend to the outside of the outer cylinder 1 and the adjacent crushing knife rollers 7 are engaged through transmission gears, and one of the crushing knife rollers 7 is connected to the output shaft of the second motor 8 through a coupling.

[0030] Specifically, the second motor 8 drives one of the crushing rollers 7 to rotate through a coupling, and the crushing roller 7 drives the other crushing rollers 7 to rotate through a transmission gear to crush the raw materials falling into the crushing channel 201.

[0031] See also Figure 5 and Figure 8 The lower end opening of the crushing channel 201 is located at the lower part of the fixed cylinder 2, and the blowing cover 23 is a long strip structure with a fan-shaped cross section. The blowing cover 23 is provided with longitudinal blowing holes 2301 that are linearly and equidistantly distributed.

[0032] Specifically, the crushed graphite powder is allowed to naturally fall into the sieve drum 10 .

[0033] See also Figure 5The air supply mechanism includes a discharge pipe 16 fixedly connected to the discharge hood 15, the outer end of the discharge pipe 16 is fixedly connected to a cyclone settling cylinder 17, the center position of the cyclone settling cylinder 17 is fixedly connected to a central exhaust pipe 18, the upper end of the central exhaust pipe 18 is fixedly connected to a blower 19, and a fan 20 is fixedly connected inside the blower 19; the air outlet end of the blower 19 is fixedly connected to an air intake manifold 22, and the air intake manifold 22 is connected to the blowing hood 23 through a first air intake pipe 24.

[0034] Specifically, the air flow flows from the outer tube 1 into the cyclone settling tube 17 through the blower 19, and the graphite powder settles in the cyclone settling tube 17, thereby realizing the collection of the graphite powder; the air flow after settling passes through the blower 19 again into the blowing hood 23, and then is ejected from the blowing hood 23, realizing the internal circulation flow of the air flow and accelerating the sedimentation and collection of the graphite powder.

[0035] In another embodiment of the present invention, see Figure 2 and Figure 9 The inner side of the upper end of the crushing channel 201 is fixedly connected to a blanking cover 9, and the lower part of the blanking cover 9 is a conical cylindrical structure with an open lower end. The feed pipe 3 is arranged opposite to the outer wall of the blanking cover 9; the outer end of the feed pipe 3 is fixedly connected to a second air intake pipe 26, and the second air intake pipe 26 is fixedly connected to the air intake main pipe 22; the first air intake pipe 24 is fixedly connected to the air intake main pipe 22 at the connection point, and the second air intake pipe 26 is fixedly connected to the air intake main pipe 22 at the connection point. The first air intake valve 25 and the second air intake valve 27 are fixedly connected to the air intake main pipe 22. The first air intake valve 25 and the second air intake valve 27 are both electrically connected to the same controller.

[0036] Specifically, by providing a second air inlet pipe 26, the air flow is injected into the pulverizing channel 201 through the feed pipe 3, and the feed pipe 3 and the pulverizing channel 201 are sprayed to reduce the residual graphite powder. At the same time, the air flow flows along the pulverizing channel 201 to spray the pulverizing blade roller 7, and then the pulverizing blade roller 7 is sprayed and cleaned, thereby increasing the service life of the pulverizing blade roller 7. In addition, the feed pipe 3 is opposite to the outer wall of the blanking cover 9, so that the air flow forms a vortex in the pulverizing channel 201, so that the raw materials are evenly scattered on the pulverizing blade roller 7, thereby improving the pulverizing efficiency, and improving the uniformity of the air flow spraying, and improving the spraying and cleaning effect. In addition, the air flow discharged through the pulverizing channel 201 is sprayed and cleaned on the sieve holes of the screen drum 10, thereby reducing the efficiency of the sieve hole blockage. It should be noted that, by providing the first electromagnetic flow valve 25 and the second electromagnetic flow valve 27, the air flow rate injected into the sieve drum 10 is greater than the air flow rate injected into the annular gap, thereby allowing the air flow to pass through the sieve holes from the sieve drum 10 into the annular gap, which is consistent with the screening and discharging direction of the graphite powder, further improving the screening efficiency and reducing the probability of sieve hole blockage.

[0037] See also Figure 12-14A side channel 1101 and a side blowing hole 1102 connected to the side channel 1101 are provided in the scraper 11. The airflow blown by the side blowing hole 1102 is used to blow the outer wall of the fixed cylinder 2 and the inner wall of the outer cylinder 1. A connecting channel 1001 connected to the side channel 1101 is provided in the sieve cylinder 10. A rotating ring 28 is fixedly connected to the side wall of the sieve cylinder 10. The rotating ring 28 is rotatably nested in the shell wall of the outer cylinder 1. The outer cylinder 1 has an annular air cavity 101 for the rotating ring 28 to rotate. The annular air cavity 101 is fixedly connected to the third air inlet pipe 29, and the third air inlet pipe 29 is fixedly connected to the air intake manifold 22.

[0038] Specifically, by injecting air flow into the side channel 1101 in the scraper 11, the air flow is ejected through the side blowing hole 1102, and the outer wall of the fixed cylinder 2, the inner wall of the blanking cover 9 and the inner wall of the outer cylinder 1 are blown and cleaned, thereby further improving the blowing and cleaning effect of the sticky graphite powder.

[0039] See also Figure 2 A third electromagnetic flow valve 30 is fixedly connected to the connection point between the third intake pipe 29 and the intake manifold 22, and the third electromagnetic flow valve 30 is electrically connected to the controller.

[0040] Specifically, after the main raw materials are crushed and screened, the third electromagnetic flow valve 30 is started to inject air into the scraper 11 , and then a spray cleaning operation is performed to reduce the interference of air flows in the screen drum 10 .

[0041] See also Figure 5 An ionizer 21 is fixedly connected to the blower 19, and the ionizer 21 is used to ionize the circulating air flow to generate ion wind.

[0042] Specifically, the ion wind is generated by the ionizer 21 to eliminate static electricity on the surface and inner wall of the device, thereby further improving the cleaning and collection effect of the adhered powder.

[0043] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A graphene production process, characterized in that: The steps include: Step 1: pretreatment: crushing, screening and drying natural flake graphite to obtain pretreated graphite powder; Step 2: oxidation: putting the pretreated graphite powder into a reactor and adding a strong acid mixture and an oxidant to carry out an oxidation reaction; Step three, stripping: putting the graphite oxide into an ultrasonic cleaner and adding deionized water solvent to perform a stripping operation to obtain an oxidized slurry; Step 4: Reduction: The oxidizing slurry and the reducing agent are put into a hydrothermal reactor to carry out a reduction reaction to obtain graphene.

2. A graphene production process according to claim 1, characterized in that, In step 1, an integrated crushing and screening device is used to crush and screen the natural flake graphite. The integrated crushing and screening device comprises an outer cylinder (1) fixedly connected to a base, a fixed cylinder (2) fixedly connected to the center of the outer cylinder (1), a crushing channel (201) running through the fixed cylinder (2), a crushing knife roller (7) connected to a second motor (8) provided in the crushing channel (201), a feed pipe (3) extending to the outside of the outer cylinder (1) fixedly connected to the outer end of the feed pipe (3), and a spiral conveying roller (5) connected to a first motor (6) provided inside the feed pipe (3); The outer cylinder (1) is located outside the fixed cylinder (2) and is rotatably connected to a screen cylinder (10), and the screen cylinder (10) is connected to a third motor (14) for driving the rotation thereof; a scraper (11) is fixedly connected to the inner side of the screen cylinder (10) and is in sliding contact with the fixed cylinder (2); the upper end opening of the crushing channel (201) is located at the upper end of the fixed cylinder (2); an annular gap is formed between the screen cylinder (10) and the outer cylinder (1); a discharge hood (15) tangentially connected to the outer cylinder (1) is fixedly connected to the lower part of the outer cylinder (1); a blow hood (23) slidably contacted with the screen cylinder (10) is fixedly connected to the side of the annular gap close to the discharge hood (15); the blow hood (23) is in sliding contact with the screen cylinder (10), and the blow hood (23) is connected to the air supply mechanism.

3. A graphene production process according to claim 1, characterized in that, The air supply mechanism comprises a discharge pipe (16) fixedly connected to the discharge hood (15); the outer end of the discharge pipe (16) is fixedly connected to a cyclone settling drum (17); the center position of the cyclone settling drum (17) is fixedly connected to a central exhaust pipe (18); the upper end of the central exhaust pipe (18) is fixedly connected to a blower (19); and the blower (19) is fixedly connected to a fan (20); the outlet end of the blower (19) is fixedly connected to an air intake manifold (22); and the air intake manifold (22) is connected to the spray hood (23) through a first air intake pipe (24).

4. A graphene production process according to claim 3, characterized in that, The inner side of the upper end of the pulverizing channel (201) is fixedly connected to a blanking cover (9), the lower part of the blanking cover (9) is a conical cylindrical structure with an open lower end, and the feed pipe (3) is arranged opposite to the outer wall of the blanking cover (9); the outer end of the feed pipe (3) is fixedly connected to a second air intake pipe (26), and the second air intake pipe (26) is fixedly connected to the air intake main pipe (22); the first air intake pipe (24) is fixedly connected to the first electromagnetic flow valve (25) at the connection point with the air intake main pipe (22), and the second air intake pipe (26) is fixedly connected to the second electromagnetic flow valve (27) at the connection point with the air intake main pipe (22), and the first electromagnetic flow valve (25) and the second electromagnetic flow valve (27) are both electrically connected to the same controller.

5. A graphene production process according to claim 4, characterized in that, The scraper (11) is provided with a side channel (1101) and a side blowing hole (1102) connected to the side channel (1101). The airflow blown by the side blowing hole (1102) is used to blow the outer wall of the fixed cylinder (2) and the inner wall of the outer cylinder (1). The screen cylinder (10) is provided with a connecting channel (1001) connected to the side channel (1101). The side wall of the screen cylinder (10) is fixedly connected to a rotating ring (28). The rotating ring (28) is rotatably nested in the shell wall of the outer cylinder (1). The outer cylinder (1) is provided with an annular air cavity (101) for the rotating ring (28) to rotate. The annular air cavity (101) is fixedly connected to a third air inlet pipe (29). The third air inlet pipe (29) is fixedly connected to the air inlet main pipe (22).

6. A graphene production process according to claim 1, characterized in that, The sieve drum (10) is a cylindrical structure with openings at both ends, and its circumferential side wall is provided with evenly distributed sieve holes; the side wall of the sieve drum (10) is fixedly connected to a gear ring (12) rotatably nested in the shell wall of the outer drum (1); the output shaft of the third motor (14) is fixedly connected to a drive gear (13) rotatably nested in the shell wall of the outer drum (1), and the drive gear (13) is meshed with the gear ring (12).

7. A graphene production process according to claim 1, characterized in that, The number of the crushing knife rollers (7) is not less than two, the crushing knife rollers (7) extend to the outside of the outer cylinder (1), and adjacent crushing knife rollers (7) are meshed through transmission gears, and one of the crushing knife rollers (7) is connected to the output shaft of the second motor (8) through a coupling.

8. A graphene production process according to claim 1, characterized in that, The lower end opening of the pulverizing channel (201) is located at the lower part of the fixed cylinder (2). The blowing cover (23) is a long strip structure with a fan-shaped cross section. The blowing cover (23) is provided with longitudinal blowing holes (2301) distributed linearly and equidistantly.

9. A graphene production process according to claim 5, characterized in that: A third electromagnetic flow valve (30) is fixedly connected to the connection point between the third air intake pipe (29) and the air intake manifold (22), and the third electromagnetic flow valve (30) is electrically connected to the controller.

10. A graphene production process according to claim 5, characterized in that: An ionizer (21) is fixedly connected to the blower (19), and the ionizer (21) is used to ionize the circulating airflow to generate ion wind.

Images