Gradient screening and purifying device for single-layer graphene dispersion liquid

Abstract

The invention relates to the technical field of graphene screening and discloses a single-layer graphene dispersion liquid gradient screening and purifying device which is mainly composed of a supporting frame, a purifying cylinder, a spiral feeding blade, a primary screening device, a secondary screening device and the like. The end, away from the screening barrel I, of the scraper I makes contact with the inner side wall of the screening barrel II, a magnetic strip is fixedly connected to the outer surface of the screening barrel II, and a scraper II is fixedly connected to the end, away from the screening barrel II, of the magnetic strip. When the graphene dispersion liquid is screened and purified through the screening cylinder I, screening is conducted through the centrifugal force of the screening cylinder I, then large-particle graphene remains in the screening cylinder I, part of graphene is attached to the inner wall of the screening cylinder II under the action of the centrifugal force, and then the screening cylinder I rotates to drive a scraper I to rotate; and graphene attached to the inner wall of the screening barrel II is scraped off through a scraper I, and meshes in the screening barrel II are prevented from being blocked by the graphene.

Description

Technical Field

[0001] The present application relates to the technical field of graphene screening, and in particular to a gradient screening and purification device for a single-layer graphene dispersion. Background Art

[0002] Graphene is an allotrope of carbon, and single-layer graphene is a single-layer hexagonal honeycomb lattice structure formed by sp² hybrid bonding of carbon atoms, with a thickness of only 0.335 nanometers. Graphene's crystal structure can be used to construct fullerenes, graphene quantum dots, carbon nanotubes, nanoribbons, multi-walled carbon nanotubes and nanohorns. Stacked graphene layers (greater than 10 layers) form graphite, and the layers are held together by van der Waals forces. Graphene has excellent optical, electrical and mechanical properties, and has important application prospects in materials science, micro-nano processing, energy, biomedicine and drug delivery. It is considered to be an important material of the future.

[0003] Graphene dispersion is a stable suspension formed by evenly dispersing graphene sheets in a solvent (such as water, organic solvent, etc.) through physical or chemical methods. Its core advantage is that it retains the intrinsic properties of graphene. Since graphene itself has strong adhesion properties, during the production process of graphene dispersion, larger particles of graphene are likely to remain inside the graphene dispersion, resulting in a decrease in the purity of the dispersion. Therefore, the graphene dispersion needs to be purified through screening.

[0004] The existing graphene dispersion screening and purification equipment is mainly a centrifugal screening machine. During use, the centrifugal screening machine mainly uses centrifugal force to force large-particle graphene to remain on the inner side of the screening cylinder, while qualified graphene dispersion will pass through the screening cylinder and be collected. In this process, due to the action of centrifugal force, some large-particle graphene will adhere to the inner wall of the screening cylinder, and the strong adhesion of graphene itself will cause the mesh on the screening cylinder to be clogged, thereby affecting the screening efficiency. Secondly, although a single screening can effectively screen large-particle graphene, after the graphene dispersion passes through the screening cylinder, some larger-sized graphene will adsorb the surrounding graphene powder, thereby causing large-particle graphene to appear again in the dispersion. Therefore, secondary screening is a necessary behavior for graphene dispersion screening. Moreover, the graphene dispersion has liquid properties, which makes the residence time of the graphene dispersion inside the screening cylinder short, which will lead to incomplete screening, thereby affecting the purification effect of the graphene dispersion. Summary of the Invention

[0005] The present application proposes a gradient screening and purification device for a single-layer graphene dispersion, which has the advantages of improving the screening effect and screening efficiency of the graphene dispersion and ensuring that the graphene dispersion is thoroughly screened. It is used to solve technical problems such as incomplete screening and easy adhesion of graphene to the screening cylinder causing blockage during the screening and purification of the graphene dispersion.

[0006] To achieve the above objectives, the present application adopts the following technical solution: a gradient screening and purification device for a single-layer graphene dispersion, comprising a support frame and: A support base is fixedly connected to the top of the support frame, a purification cartridge is fixedly mounted on the upper surface of the support base, a cartridge cover is hingedly connected to the left side wall of the purification cartridge via a hinge, a motor I is fixedly mounted on the right side wall of the purification cartridge via a mounting plate, and a transmission shaft is fixedly connected to the output end of the motor I; The feed cylinder is fixedly connected to the middle of the right side wall of the purification cylinder, and a feed pipe is fixedly connected to the upper side of the feed cylinder. A spiral feed blade is movably provided inside the feed cylinder, and the end of the transmission shaft away from the motor I extends into the feed cylinder and is fixedly connected to the spiral feed blade. A primary screening device is provided inside the purification cylinder, and a secondary screening device is provided inside the purification cylinder.

[0007] Furthermore, the primary screening device comprises: Screening cylinder I, rotatably disposed in the inner cavity of the purification cylinder, the feed cylinder being connected to the screening cylinder I; A fixed rod, fixedly sleeved on the end of the transmission shaft away from the spiral feed blade, and both ends of the fixed rod are fixedly connected to the inner wall of the screening cylinder I; A rubber diaphragm I is arranged on the left side of the screening cylinder I; The first discharging cylinder is fixedly sleeved on the middle part of the rubber partition I, and the first discharging cylinder is connected with the left opening of the screening cylinder I.

[0008] Furthermore, the secondary screening device includes: Screening cylinder II, arranged on the outside of the screening cylinder I; a fixed ring, fixedly connected to the left side of the inner cavity side wall of the purification cylinder; a sealing plate connected to the left side wall of the fixing ring by bolts; Motor II is fixedly installed in the middle of the sealing plate, the output shaft of the motor II is fixedly connected to the left side wall of the screening drum II, and the right end of the screening drum II is rotatably connected to the second discharge drum.

[0009] Furthermore, the first discharging barrel includes: Through hole I, provided at the lower portion of the side wall of the first discharge barrel; Through hole II is provided at the lower part of the side wall of the screening cylinder II and corresponds to through hole I; Discharge pipe I, fixedly connected to the bottom of the purification cylinder and corresponding to through hole II; The rubber partition plate II is fixedly sleeved on the outer surface of the screening cylinder II and is located on the right side of the through hole II.

[0010] Furthermore, the second discharging barrel includes: A discharge pipe II is fixedly connected to the bottom of the second discharge cylinder, and the lower portion of the discharge pipe II passes through the bottom wall of the purification cylinder and is fixedly connected to the purification cylinder; The discharge pipe III is fixedly connected to the middle part of the bottom surface of the purification cylinder.

[0011] Furthermore, the screening cylinder I includes: The scraper I is fixedly connected to the outer surface of the screening cylinder I, and one end of the scraper I away from the screening cylinder I contacts the inner wall of the screening cylinder II.

[0012] Furthermore, the screening cylinder II includes: A magnetic strip fixedly connected to the outer surface of the screening cylinder II; The scraper II is fixedly connected to the end of the magnetic strip away from the screening cylinder II, and the end of the scraper II away from the magnetic strip is in contact with the inner wall of the purification cylinder.

[0013] Furthermore, the first discharge barrel includes: a rotating shaft, rotatably connected to the middle portion of the inner side wall of the first discharging barrel; A magnetic spiral blade is fixedly connected to the end of the rotating shaft away from the first discharge cylinder, and the rotation direction of the magnetic spiral blade is opposite to that of the spiral feeding blade; a baffle bar, fixedly connected to the magnetic spiral blade; A spiral groove is provided on the outer surface of the magnetic spiral blade; A coil spring is arranged on the outer surface of the rotating shaft, one end of the coil spring is fixedly connected to the outer surface of the rotating shaft, and the other end of the coil spring is fixedly connected to the inner side wall of the first discharging cylinder.

[0014] Furthermore, the outer surface of the magnetic spiral leaf is in sliding contact with the inner wall of the screening drum I, the magnetic spiral leaf is within the magnetic field range of the magnetic strip, the magnetism of the magnetic spiral leaf is opposite to that of the magnetic strip, and the rotation directions of the screening drum I and the screening drum II are opposite.

[0015] The present application provides a device for gradient screening and purification of a single-layer graphene dispersion. By designing a screening cylinder II, a scraper I and a scraper II, when the graphene dispersion enters the screening cylinder I for screening and purification, the centrifugal force of the screening cylinder I is used for screening, and then large particles of graphene will remain in the screening cylinder I, and part of the graphene will adhere to the inner wall of the screening cylinder II under the action of the centrifugal force. Then, the screening cylinder I is rotated with the scraper I to rotate, and the graphene attached to the inner wall of the screening cylinder II is scraped off by the scraper I to prevent the mesh on the screening cylinder II from being blocked by the graphene. At the same time, due to the The scraper is made of rubber, and the inclination directions of screening cylinder I and screening cylinder II are opposite, which causes scraper I to twist during rotation, and the twisting of scraper I will be restored at the large gap between screening cylinder I and screening cylinder II. Since the elastic potential energy of scraper I is released during the recovery process, the graphene attached to scraper I will return to the centrifugal force range of screening cylinder I again and continue centrifugal screening. Similarly, scraper II on screening cylinder II will also scrape off the graphene attached to the inner wall of the purification cylinder and prompt the graphene to return to the centrifugal range of screening cylinder II again to continue screening.

[0016] By designing magnetic spiral leaves, baffles, spiral grooves and magnetic strips, when screening drum II rotates, since the rubber diaphragm I is attached to the inner wall of screening drum II by extrusion force, screening drum II uses the magnetic attraction of the rubber diaphragm I and the magnetic strips on the magnetic spiral leaves to rotate the first discharge drum and the magnetic spiral leaves. Since the rotation direction of the magnetic spiral leaves is opposite to that of the spiral feed leaves, the graphene dispersion entering the interior of screening drum I will be squeezed between the spiral feed leaves and the magnetic spiral leaves, so that the graphene can be quickly separated from the liquid after being squeezed, thereby improving the screening efficiency.

[0017] At the same time, due to the design of the baffle and the magnetic strip, when the graphene inside the screening cylinder I flies toward the inner wall of the screening cylinder I under the action of centrifugal force, the scattered graphene will collide with the baffle, causing the agglomerated graphene to disperse after the impact, thereby improving the screening effect. In addition, the design of the magnetic spiral leaves and the magnetic strip allows the graphene dispersion to be affected by the magnetic field, and the magnetic field can significantly improve the transmission efficiency of the graphene spin-polarized carriers, so that the agglomerated graphene can be quickly dispersed, which will further improve the screening effect of the graphene dispersion.

[0018] Secondly, by designing magnetic spiral leaves, spiral grooves and coil springs, when the screening drum II rotates with the first discharge drum through the rubber diaphragm I, and the magnetic strip rotates with the magnetic spiral leaves by magnetic attraction, the coil spring at this time will be coiled by the force of the rotating shaft, so that the coil spring stores energy. When the potential energy of the coil spring is greater than the sum of the friction between the rubber diaphragm I and the screening drum II and the magnetic attraction of the magnetic strip on the magnetic spiral leaves, the potential energy of the coil spring is released, causing the rotating shaft to rotate with the magnetic spiral leaves in the opposite direction. At this time, large-particle graphene will be pushed into the first discharge drum by the reverse-rotating magnetic spiral leaves, while graphene that meets the size will be blocked by the spiral groove and continue to stay in the inside of the screening drum I for screening. Secondly, when the magnetic spiral leaves are rotated by the magnetic strips, the residence time of the graphene dispersion in the screening drum I will be prolonged, and the graphene dispersion can be screened as much as possible, making the screening of the graphene dispersion more thorough, thereby improving the purification effect of the graphene. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments disclosed herein and, together with the description, serve to explain the principles disclosed herein.

[0020] The present disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the purification cartridge of the present invention; Figure 3 This is a schematic diagram of the internal structure of the screening cylinder I of the present invention; Figure 4 This is a schematic diagram of the internal structure of the screening cylinder II of the present invention; Figure 5 This is a schematic diagram of the structure of the screening cylinder I and the screening cylinder II of the present invention; Figure 6 This is a structural diagram of the magnetic spiral blade of the present invention.

[0021] Among them: 1. Support frame; 2. Support seat; 3. Purification cylinder; 4. Cylinder cover; 5. Motor I; 6. Drive shaft; 7. Feed cylinder; 8. Feed pipe; 9. Spiral feed blade; 10. Fixed rod; 11. Screening cylinder I; 110. Scraper I; 12. Fixed ring; 13. Sealing plate; 14. Motor II; 15. Screening cylinder II; 151. Magnetic strip; 152. Scraper II; 16. Rubber diaphragm I; 17. First discharging cylinder; 171. Rotating shaft; 172. Magnetic spiral blade; 173. Baffle; 174. Spiral groove; 175. Coil spring; 18. Through hole I; 19. Through hole II; 20. Discharging pipe I; 21. Rubber diaphragm II; 22. Second discharging cylinder; 23. Discharging pipe II; 24. Discharging pipe III. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0023] See also Figures 1-6 , a gradient screening and purification device for a single-layer graphene dispersion comprises a support frame 1, a support seat 2 is fixedly installed on the top of the support frame 1, a purification cylinder 3 is fixedly installed on the upper surface of the support seat 2, the left wall of the purification cylinder 3 is hinged with a cylinder cover 4 through a hinge, a motor Ⅰ 5 is fixedly installed on the right wall of the purification cylinder 3 through a mounting plate, the output end of the motor Ⅰ 5 is fixedly connected to a transmission shaft 6, a feeding cylinder 7 is fixedly installed in the middle of the right wall of the purification cylinder 3, a feeding pipe 8 is fixedly connected to the upper side of the feeding cylinder 7, a spiral feeding blade 9 is movably provided inside the feeding cylinder 7, and the end of the transmission shaft 6 away from the motor Ⅰ 5 extends into the feeding cylinder 7 and is fixedly connected to the spiral feeding blade 9, and the raw material is driven into the interior of the purification cylinder 3 by the spiral feeding blade 9, the interior of the purification cylinder 3 is provided with a primary screening device, and the interior of the purification cylinder 3 is provided with a secondary screening device.

[0024] See also Figures 1-6 The primary screening device includes a screening drum Ⅰ11, which is rotatably arranged in the inner cavity of the purification drum 3, and the feeding drum 7 is connected to the screening drum Ⅰ11 to ensure that the raw materials inside the feeding drum 7 are pushed by the spiral feeding blades 9 to enter the interior of the screening drum Ⅰ11. The end of the transmission shaft 6 away from the spiral feeding blades 9 is fixedly sleeved with a fixed rod 10, and the two ends of the fixed rod 10 are fixedly connected to the inner wall of the screening drum Ⅰ11 to ensure that the motor Ⅰ5 drives the spiral feeding blades 9 to rotate while the fixed rod 10 can be used to drive the screening drum Ⅰ11 to rotate synchronously, thereby utilizing the centrifugal force generated by the rotation of the screening drum Ⅰ11 to screen the graphene dispersion. A rubber diaphragm Ⅰ16 is provided on the left side of the screening drum Ⅰ11, and a first discharging drum 17 is fixedly sleeved in the middle of the rubber diaphragm Ⅰ16. The first discharging drum 17 is connected to the left opening of the screening drum Ⅰ11 to ensure that the large-particle graphene screened out from the inside of the screening drum Ⅰ11 will enter the first discharging drum 17.

[0025] See also Figures 1-6The secondary screening device includes a screening cylinder II 15. A screening cylinder II 15 is provided on the outside of the screening cylinder I 11 to ensure that the dispersion screened by the screening cylinder I 11 will enter the screening cylinder II 15 for secondary screening. A fixing ring 12 is fixedly connected to the left part of the inner cavity side wall of the purification cylinder 3. A sealing plate 13 is installed on the left side wall of the fixing ring 12 by bolts. A motor II 14 is fixedly installed in the middle of the sealing plate 13. The output shaft of the motor II 14 is fixedly connected to the left side wall of the screening cylinder II 15 to ensure that the motor II 14 can drive the screening cylinder II 15 to rotate, thereby utilizing the centrifugal force when the screening cylinder II 15 rotates to screen the dispersion. The right end of the screening cylinder II 15 is rotatably connected to the second discharging cylinder 22 to ensure that the graphene particles screened by the screening cylinder II 15 will enter the second discharging cylinder 22.

[0026] See also Figures 1-6 A through hole I18 is provided at the lower part of the side wall of the first discharge barrel 17 to ensure that the large particles of graphene in the first discharge barrel 17 will be discharged through the through hole I18. A through hole II19 is provided at the lower part of the side wall of the screening barrel Ⅱ15 corresponding to the through hole I18. The large particles of graphene discharged through the through hole I18 will be blocked by the rubber partition I16, so that the large particles of graphene can only be discharged through the through hole II19. A discharge pipe I20 is fixedly connected to the bottom of the purification barrel 3 corresponding to the through hole II19. The outer surface of the screening barrel Ⅱ15 is located on the right side of the through hole II19 and is fixedly sleeved with a rubber partition II21. The large particles of graphene discharged from the through hole II19 will be blocked by the rubber partition II21, so that the large particles of graphene can only be discharged and collected through the discharge pipe I20.

[0027] See also Figures 1-6 The bottom of the second discharge cylinder 22 is fixedly connected with a discharge pipe II 23 to ensure that the graphene particles screened out at the screening cylinder II 15 will be discharged through the discharge pipe II 23 and collected. The lower part of the discharge pipe II 23 passes through the bottom wall of the purification cylinder 3 and is fixedly connected to the purification cylinder 3. The middle part of the bottom surface of the purification cylinder 3 is fixedly connected with a discharge pipe III 24. The qualified graphene dispersion after two screenings will pass through the screening cylinder II 15 and finally be discharged through the discharge pipe III 24 and collected.

[0028] See also Figures 1-6 A scraper I110 is fixedly connected to the outer surface of the screening cylinder I11, and the end of the scraper I110 away from the screening cylinder I11 is in contact with the inner wall of the screening cylinder II15, so that the scraper I110 can scrape off the graphene attached to the inner wall of the screening cylinder II15 to prevent the mesh on the screening cylinder II15 from being blocked.

[0029] See also Figures 1-6A magnetic strip 151 is fixedly connected to the outer surface of the screening cylinder II 15, and a scraper II 152 is fixedly connected to the end of the magnetic strip 151 away from the screening cylinder II 15. The end of the scraper II 152 away from the magnetic strip 151 contacts the inner wall of the purification cylinder 3, so that the scraper II 152 can scrape off the graphene attached to the inner wall of the purification cylinder 3.

[0030] See also Figures 1-6 The middle part of the inner wall of the first discharging cylinder 17 is rotatably connected to a rotating shaft 171, and the end of the rotating shaft 171 away from the first discharging cylinder 17 is fixedly connected to a magnetic spiral blade 172, and a baffle 173 is fixedly connected to the magnetic spiral blade 172. Through the design of the baffle 173, the graphene particles in the dispersion will collide with the baffle 173, and the graphene particles after the collision are easily dispersed, thereby reducing the generation of large-particle graphene. The outer surface of the magnetic spiral blade 172 is provided with a spiral groove 174. Since large-particle graphene cannot enter the spiral groove 174 due to volume limitations, the spiral groove 174 can prompt qualified graphene particles to stay in the interior of the screening cylinder Ⅰ11 for sufficient screening and will not be discharged at the same time as large-particle graphene. The outer surface of the rotating shaft 171 is provided with a coil spring 175, one end of the coil spring 175 is fixedly connected to the outer surface of the rotating shaft 171, and the other end of the coil spring 175 is fixedly connected to the inner wall of the first discharging cylinder 17.

[0031] See also Figures 1-6 The outer surface of the magnetic spiral blade 172 is in sliding contact with the inner wall of the screening drum I11. Since the rotation direction of the screening drum I11 is opposite to that of the magnetic spiral blade 172, the screening drum I11 can use the magnetic spiral blade 172 to scrape off the graphene attached to the inner wall of the screening drum I11 during its rotation, thereby preventing the mesh on the screening drum I11 from being clogged. The rotation direction of the magnetic spiral blade 172 is opposite to that of the spiral feeding blade 9. The magnetic spiral blade 172 is within the magnetic field range of the magnetic strip 151. The magnetism of the magnetic spiral blade 172 is opposite to that of the magnetic strip 151, so that when the screening drum II15 rotates, the magnetic spiral blade 172 is driven to rotate by the magnetic attraction between the magnetic strip 151 and the magnetic spiral blade 172. The rotation directions of the screening drum I11 and the screening drum II15 are opposite.

[0032] Working principle: When the graphene dispersion needs to be screened and purified, the outlet pipe of the graphene dispersion is connected to the feed pipe 8, and then the motor I5 is turned on. The motor I5 drives the spiral feed blade 9 to rotate through the transmission shaft 6, so that the graphene dispersion enters the screening cylinder I11, and then the motor I5 drives the screening cylinder I11 to rotate through the transmission shaft 6 and the fixed rod 10, so as to utilize the centrifugal force when the screening cylinder I11 rotates to screen and purify the graphene dispersion. At the same time, the motor II14 is turned on, and the motor II14 drives the screening cylinder II15 to rotate. The raw materials screened by the screening cylinder I11 will enter the screening cylinder II15 for secondary screening. In this process, part of the graphene is attached to the inner wall of the screening cylinder II15 due to the centrifugal force, and then the screening cylinder is used. The rotation of Ⅰ11 brings with it the scraper Ⅰ110, which scrapes off the graphene attached to the inner wall of the screening cylinder Ⅱ15 through the scraper Ⅰ110 to prevent the mesh holes on the screening cylinder Ⅱ15 from being blocked by the graphene. At the same time, since the scraper Ⅰ110 is made of rubber and the inclination directions of the screening cylinder Ⅰ11 and the screening cylinder Ⅱ15 are opposite, the scraper Ⅰ110 will be twisted during the rotation process, and the distortion generated by the scraper Ⅰ110 will be restored at the large gap between the screening cylinder Ⅰ11 and the screening cylinder Ⅱ15. Since the elastic potential energy is released during the recovery process of the scraper Ⅰ110, the graphene attached to the scraper Ⅰ110 will return to the centrifugal force range of the screening cylinder Ⅰ11 again and continue centrifugal screening. Similarly, the scraper Ⅱ152 on the screening cylinder Ⅱ15 will also The graphene attached to the inner wall of the purification cylinder 3 is scraped off, and the graphene is forced to return to the centrifugal range of the screening cylinder Ⅱ15 to continue screening. When the screening cylinder Ⅱ15 rotates, the rubber diaphragm Ⅰ16 is attached to the inner wall of the screening cylinder Ⅱ15 by extrusion force. At this time, the screening cylinder Ⅱ15 uses the magnetic attraction of the rubber diaphragm Ⅰ16 and the magnetic strip 151 to the magnetic spiral leaf 172 to rotate the first discharge cylinder 17 and the magnetic spiral leaf 172. Since the rotation direction of the magnetic spiral leaf 172 is opposite to that of the spiral feed leaf 9, the graphene dispersion entering the interior of the screening cylinder Ⅰ11 will be squeezed between the spiral feed leaf 9 and the magnetic spiral leaf 172, so that the graphene can be quickly separated from the liquid after being squeezed, thereby improving the screening efficiency. When the screening cylinder Ⅰ11 When the graphene inside flies toward the inner wall of the screening cylinder I11 under the action of centrifugal force, the scattered graphene will collide with the baffle 173, causing the agglomerated graphene to disperse after the impact, thereby improving the screening effect. In addition, the design of the magnetic spiral blade 172 and the magnetic strip 151 makes the graphene dispersion liquid be affected by the force of the magnetic field, and the magnetic field can significantly improve the transmission efficiency of the graphene spin-polarized carriers, so that the agglomerated graphene can be quickly dispersed, which will further improve the screening effect of the graphene dispersion liquid. When the screening cylinder II15 rotates with the first discharging cylinder 17 through the rubber diaphragm I16, and the magnetic strip 151 rotates with the magnetic spiral blade 172 using the magnetic attraction force, the coil spring 175 at this time will be wound up by the force of the rotation of the rotating shaft 171.The coil spring 175 stores energy. When the potential energy of the coil spring 175 is greater than the sum of the friction between the rubber diaphragm Ⅰ16 and the screening drum Ⅱ15 and the magnetic attraction of the magnetic strip 151 to the magnetic spiral leaf 172, the potential energy of the coil spring 175 is released, causing the rotating shaft 171 to rotate in the opposite direction with the magnetic spiral leaf 172. At this time, large-particle graphene will be pushed into the first discharge drum 17 by the reverse-rotating magnetic spiral leaf 172, while graphene that meets the size will be blocked by the spiral groove 174 and continue to stay in the inside of the screening drum Ⅰ11 for screening. Secondly, when the magnetic spiral leaf 172 is rotated by the magnetic strip 151, the graphene dispersion will be The extended residence time inside screening drum I 11 allows for maximum screening of the graphene dispersion, resulting in more thorough screening and improved graphene purification. After screening, large graphene particles enter screening drum II 15 through through-hole I 18. Blocked by rubber diaphragm I 16, these large particles can only be discharged through through-hole II 19 into discharge pipe I 20. Qualified graphene, however, is moved by the tilt of screening drum II 15 to the second discharge drum 22 and ultimately discharged through discharge pipe II 23. The screened liquid then passes through screening drum II 15 and is discharged through discharge pipe III 24.

Claims

1. A gradient screening and purification device for a monolayer graphene dispersion, comprising a support frame (1), characterized in that: Also includes: A support base (2) is fixedly connected to the top of the support frame (1); a purification cylinder (3) is fixedly mounted on the upper surface of the support base (2); a cylinder cover (4) is hingedly connected to the left side wall of the purification cylinder (3); a motor I (5) is fixedly mounted on the right side wall of the purification cylinder (3) via a mounting plate; and a transmission shaft (6) is fixedly connected to the output end of the motor I (5); A feed cylinder (7) is fixedly connected to the middle of the right side wall of the purification cylinder (3), a feed pipe (8) is fixedly connected to the upper side of the feed cylinder (7), a spiral feed blade (9) is movably provided inside the feed cylinder (7), the end of the transmission shaft (6) away from the motor I (5) extends into the feed cylinder (7) and is fixedly connected to the spiral feed blade (9), a primary screening device is provided inside the purification cylinder (3), and a secondary screening device is provided inside the purification cylinder (3).

2. The device for gradient screening and purification of a single-layer graphene dispersion according to claim 1, wherein: The primary screening device comprises: A screening cylinder I (11) is rotatably disposed in the inner cavity of the purification cylinder (3), and the feed cylinder (7) is connected to the screening cylinder I (11); A fixed rod (10) is fixedly sleeved on one end of the transmission shaft (6) away from the spiral feed blade (9), and both ends of the fixed rod (10) are fixedly connected to the inner wall of the screening cylinder I (11); A rubber diaphragm I (16) is provided on the left side of the screening cylinder I (11); The first discharge cylinder (17) is fixedly sleeved on the middle part of the rubber diaphragm I (16), and the first discharge cylinder (17) is connected to the left opening of the screening cylinder I (11).

3. The gradient screening and purification device for a single-layer graphene dispersion according to claim 2, characterized in that: The secondary screening device comprises: Screening cylinder II (15), arranged outside the screening cylinder I (11); A fixed ring (12) fixedly connected to the left side of the inner cavity side wall of the purification cylinder (3); A sealing plate (13) connected to the left side wall of the fixing ring (12) by bolts; The motor II (14) is fixedly mounted in the middle of the sealing plate (13), and the output shaft of the motor II (14) is fixedly connected to the left side wall of the screening drum II (15). The right end of the screening drum II (15) is rotatably connected to the second discharge drum (22).

4. The device for gradient screening and purification of a single-layer graphene dispersion according to claim 3, wherein: The first discharge barrel (17) comprises: A through hole I (18) is provided at the lower portion of the side wall of the first discharge barrel (17); A through hole II (19) is provided at the lower portion of the side wall of the screening cylinder II (15) and corresponds to the through hole I (18); A discharge pipe I (20) is fixedly connected to the bottom of the purification cylinder (3) and corresponds to the through hole II (19); The rubber diaphragm II (21) is fixedly sleeved on the outer surface of the screening cylinder II (15) and is located on the right side of the through hole II (19).

5. The gradient screening and purification device for a single-layer graphene dispersion according to claim 4, characterized in that: The second discharge barrel (22) comprises: A discharge pipe II (23) is fixedly connected to the bottom of the second discharge cylinder (22), and the lower part of the discharge pipe II (23) passes through the bottom wall of the purification cylinder (3) and is fixedly connected to the purification cylinder (3); The discharge pipe III (24) is fixedly connected to the middle of the bottom surface of the purification cylinder (3).

6. The device for gradient screening and purification of a single-layer graphene dispersion according to claim 5, characterized in that: The screening cylinder I (11) includes: The scraper I (110) is fixedly connected to the outer surface of the screening cylinder I (11), and one end of the scraper I (110) away from the screening cylinder I (11) contacts the inner wall of the screening cylinder II (15).

7. The device for gradient screening and purification of a single-layer graphene dispersion according to claim 6, characterized in that: The screening cylinder II (15) includes: A magnetic strip (151) fixedly connected to the outer surface of the screening cylinder II (15); The scraper II (152) is fixedly connected to one end of the magnetic strip (151) away from the screening cylinder II (15), and the end of the scraper II (152) away from the magnetic strip (151) contacts the inner wall of the purification cylinder (3).

8. The device for gradient screening and purification of a single-layer graphene dispersion according to claim 7, characterized in that: The first discharge barrel (17) includes: A rotating shaft (171) rotatably connected to the middle portion of the inner side wall of the first discharge barrel (17); A magnetic spiral blade (172) is fixedly connected to an end of the rotating shaft (171) away from the first discharge cylinder (17), and the rotation direction of the magnetic spiral blade (172) is opposite to that of the spiral feeding blade (9); A blocking bar (173) fixedly connected to the magnetic spiral leaf (172); A spiral groove (174) is provided on the outer surface of the magnetic spiral leaf (172); A coil spring (175) is provided on the outer surface of the rotating shaft (171), one end of the coil spring (175) is fixedly connected to the outer surface of the rotating shaft (171), and the other end of the coil spring (175) is fixedly connected to the inner wall of the first discharge barrel (17).

9. The device for gradient screening and purification of a single-layer graphene dispersion according to claim 8, characterized in that: The outer surface of the magnetic spiral blade (172) is in sliding contact with the inner wall of the screening drum I (11), the magnetic spiral blade (172) is within the magnetic field of the magnetic strip (151), the magnetism of the magnetic spiral blade (172) is opposite to that of the magnetic strip (151), and the rotation directions of the screening drum I (11) and the screening drum II (15) are opposite.

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