CN117839843B - Graphene pretreatment grinding equipment - Google Patents
Graphene pretreatment grinding equipment Download PDFInfo
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- CN117839843B CN117839843B CN202410246364.1A CN202410246364A CN117839843B CN 117839843 B CN117839843 B CN 117839843B CN 202410246364 A CN202410246364 A CN 202410246364A CN 117839843 B CN117839843 B CN 117839843B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000001125 extrusion Methods 0.000 claims abstract description 18
- 239000004744 fabric Substances 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 abstract description 54
- 239000010439 graphite Substances 0.000 abstract description 54
- -1 graphite alkene Chemical class 0.000 abstract description 54
- 230000000694 effects Effects 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 11
- 239000000843 powder Substances 0.000 description 8
- 241000883990 Flabellum Species 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012377 drug delivery Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses graphene pretreatment grinding equipment, and relates to the technical field of graphene pretreatment. This graphene pretreatment grinding equipment, the on-line screen storage device comprises a base, base top fixedly connected with grinds the fill, the outer wall fixedly connected with of grinding the fill keeps in the case, the top joint of keeping in the case has first apron, the base top is kept away from the position fixedly connected with water tank on grinding the fill right side, the inner wall fixedly connected with grinding mechanism of water tank. This graphite alkene preliminary treatment grinding equipment through utilizing the continuous activity of controlling of drive board, and then can be continuous drive rivers flow, and then repeatedly grinds graphite alkene, and rivers can reduce the temperature of rivers at the in-process that flows, and then further reduce the temperature of graphite alkene, and the reduction of rivers temperature and then better reduce the grinding roller temperature, can extrude the right side of grinding roller through the extrusion pole under the continued movement of drive board, then increase the extrusion dynamics of grinding roller to graphite alkene.
Description
Technical Field
The invention relates to the technical field of graphene pretreatment, in particular to graphene pretreatment grinding equipment.
Background
The graphene has excellent optical, electrical and mechanical properties, and has important application prospects in the aspects of material science, micro-nano processing, energy, biomedicine, drug delivery and the like;
The patent refers to China patent No. CN202311170532.5, which discloses raw material pretreatment equipment for preparing graphene materials, and belongs to the technical field of graphene material treatment, and the equipment comprises a shell, wherein a base is fixedly arranged at the bottom of the shell, two mounting plates are fixedly arranged at the top of the shell, a charging barrel is fixedly arranged at the top of the two mounting plates through a mounting column, and a feeding port is arranged on the top surface of the charging barrel; according to the invention, the dislocation grinding assembly is arranged in the device, so that the device has different grinding intervals, and raw materials with different particle sizes can be ground;
in the grinding process of the graphene, the common grinding adopts impact or mutual friction, and when the means is adopted for grinding the graphene, the graphene has very good heat conduction performance, so that the graphene is overheated, and the service life of the graphene is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides graphene pretreatment grinding equipment for solving the problems in the background art.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the graphene pretreatment grinding equipment comprises a base, wherein the top of the base is fixedly connected with a grinding hopper, the outer wall of the grinding hopper is fixedly connected with a temporary storage box, the top of the temporary storage box is clamped with a first cover plate, the top of the base is positioned on the right side of the grinding hopper and is fixedly connected with a water tank, and the inner wall of the water tank is fixedly connected with a grinding mechanism;
The grinding mechanism includes:
The right side of the grinding roller is inserted into the left side of the water tank, waterproof elastic cloth is fixedly connected between the grinding roller and the water tank, a cavity is formed in the grinding roller, and the cavity is communicated with the water tank;
the sliding rod is fixedly connected to the top of the water tank;
The electric sliding block is connected to the outer wall of the sliding rod in a sliding mode.
Preferably, the outer wall fixedly connected with of electronic slider drives the board, the outer wall of driving the board and the interior left side of grinding roller between fixedly connected with first spring.
Preferably, the left side fixedly connected with extrusion pole of drive board, the right side movable contact of extrusion pole and grinding roller.
Preferably, the outer wall fixedly connected with interception mechanism of grinding roller, interception mechanism includes the barometric plate, the barometric plate cup joints the outer wall at the grinding roller.
Preferably, the air inlet is set up to the outer wall of air pressure board, the left side grafting of air inlet has the interception board, fixedly connected with second spring between interception board outer wall and the air pressure board outer wall, the air pressure board is pegged graft on the right side of grinding the fill, still can extrude the gas in the grinding fill when having utilized the air pressure board to be arranged in grinding the fill and blow off towards the pipeline, the air current is in the pipeline then enters into the storage bin, the air current can continue to pass through in the sponge piece on the storage bin, when the air current is kept away from grinding the fill, can take the graphite alkene that floats in the grinding fill, then the filtration of passing through the sponge piece, the graphite alkene is arranged in the storage bin, then the air current discharges after the filtration of sponge piece, the effect of collecting graphite alkene powder can be produced in the flow of air current, the air current that the cooperation outlet duct blew off, can continuously drive the graphite alkene powder activity after grinding to the storage bin in, the grinding precision of graphite alkene has been ensured.
Preferably, the left side fixedly connected with support of water tank, the outer wall fixedly connected with interception ring of support, interception ring and grinding roller movable contact.
Preferably, the top fixedly connected with pipeline of grinding fill, the left side fixedly connected with storehouse of pipeline, the positive joint in storehouse has the second apron, the hole is seted up at the top in storehouse, fixedly connected with sponge piece in the storehouse top hole, the bottom in storehouse and the top fixedly connected with of base.
Preferably, the outer wall fixedly connected with crushing mechanism of grinding fill, crushing mechanism includes first storehouse and the second of placing and places the storehouse, first storehouse and the second of placing are placed the storehouse and are being ground the backside and the front of fighting respectively fixed connection, grind fill, first storehouse and the inside intercommunication of placing the storehouse of second, the inner wall fixedly connected with fan in storehouse is placed to the second, the outer wall rotation of fan is connected with the rotor, the outer wall fixedly connected with crushing rod of rotor, the one end of the right side fixedly connected with outlet duct of fan, the other end fixedly connected with of outlet duct is in the bottom of grinding the fill.
The invention provides graphene pretreatment grinding equipment. The beneficial effects are as follows:
1. This graphite alkene preliminary treatment grinding equipment is located the slide bar through electronic slider and moves, then can drive the drive board and move towards the left side, can drive the water in the water tank towards the left side and turn on one's side when driving the board activity, thereby get into the inside cavity of grinding roller, this in-process, rivers can cool down to the grinding roller at first, then rivers activity also can produce the impact to the grinding roller, thereby the crushing effect to graphite alkene has been produced, moreover, the rivers that drive the board and drive, the kick speed of rivers is greater than the activity speed of drive board, so rivers can drive the grinding roller and strike on the graphite alkene fast, then the cooperation drives the board and extrudees through the power of extrusion pole, the graphite alkene extrusion of grinding roller to grinding hopper has been produced, the graphite alkene of grinding roller in grinding hopper can be extruded under the impact of water, water level in the grinding roller can reduce the temperature of grinding roller, then make the temperature of graphite alkene reduce, the overheating of graphite alkene has been avoided, the protection to graphite alkene quality has been played.
2. This graphite alkene preliminary treatment grinding equipment through utilizing the continuous activity of controlling of drive board, and then can be continuous drive rivers flow, and then repeatedly grind graphite alkene, rivers can reduce the temperature of rivers at the in-process that flows, and then further reduce the temperature of graphite alkene, the reduction of rivers temperature and then better to grinding roller temperature, can extrude the right side of grinding roller through the extrusion pole under the continuation of drive board, then increase grinding roller to the extrusion dynamics of graphite alkene, can extrude harder graphite alkene piece and smash, guaranteed the crushing of graphite alkene piece.
3. This graphite alkene preliminary treatment grinding equipment, when being arranged in grinding the fill through the grinding roller and remove, the grinding roller still can drive the barometric pressure board and remove, the barometric pressure board can extrude the gas in the grinding fill, then make the gas on grinding fill right side move towards the left side, the graphite alkene that can drive the interior right side part of grinding fill at this in-process moves towards the left side, the removal of air pressure board also can promote graphite alkene and move towards the left side, then make grinding roller and grinding fill inner wall grind the graphite alkene, make the graphite alkene activity in the grinding fill to the position of being ground, extrusion efficiency to graphite alkene has been improved.
4. This graphite alkene preliminary treatment grinding equipment, still can extrude the gas in grinding the fill when moving to left in being located the grinding fill through utilizing the barometer and blow off towards the pipeline, the air current is in the pipeline then enters into the storage storehouse, the air current can continue to pass through in the sponge piece on the storage storehouse, when the air current is kept away from grinding the fill, can take up the graphite alkene that floats in the grinding fill, then filter through the sponge piece, graphite alkene is located the storage storehouse, then the air current is discharged after the filtration of sponge piece, the effect of collecting graphite alkene powder can be produced in the flow of air current, the air current that the cooperation outlet duct blown off, can continuously drive the graphite alkene powder activity after grinding to the storage storehouse in, the grinding precision of graphite alkene has been ensured.
5. This graphite alkene preliminary treatment grinding equipment is connected in the bottom of grinding the fill through the outlet duct, then blows out the air current and to grind in the fill, and the flow of air current can reduce the temperature of graphite alkene, produces the effect that reduces the graphite alkene temperature, has played the protection to the quality of graphite alkene then, and the air current also can drive to grind the graphite alkene that is smashed in the fill and float moreover, then the air current carries graphite alkene powder and stores in the storehouse through the pipeline, also can increase the collection efficiency of graphite alkene powder.
6. This graphite alkene preliminary treatment grinding equipment can produce the rotation through utilizing the fan working process, then utilize the rotation of the inside flabellum of fan to drive the rotation of rotor, the rotor can drive crushing pole rotation, cut graphite alkene when crushing pole is rotatory, improved crushing efficiency to graphite alkene, then crushing pole is elastic metal material, then when the inner wall of grinding the fill is being extruded to the extrusion, crushing pole can be extruded the shrink, and then make crushing pole can the graphite alkene extrusion crushing in shrink process, the extrusion of cooperation grinding roller has improved the crushing efficiency of graphite alkene.
Drawings
FIG. 1 is a schematic view of a shaft-side perspective of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged schematic view of the portion A of FIG. 2 according to the present invention;
FIG. 4 is a schematic view of a partial structure of an electric slider according to the present invention;
FIG. 5 is a schematic view of the backside perspective of the present invention;
FIG. 6 is a schematic view of the left-hand side perspective of the present invention;
FIG. 7 is a schematic cross-sectional view of FIG. 6 in accordance with the present invention;
FIG. 8 is a schematic view of a fan according to the present invention.
In the figure: 1. a base; 2. a water tank; 3. grinding hopper; 4. a temporary storage box; 5. a first cover plate; 6. a grinding mechanism; 61. a slide bar; 62. a driving plate; 63. an extrusion rod; 64. an electric slide block; 65. a first spring; 66. waterproof elastic cloth; 67. a grinding roller; 7. an interception mechanism; 71. a second spring; 72. an interception plate; 73. an air inlet; 74. a bracket; 75. an interception ring; 76. an air pressure plate; 8. a crushing mechanism; 81. crushing the rod; 82. a rotating roller; 83. a blower; 84. a first placement bin; 85. a second placement bin; 86. an air outlet pipe; 9. a sponge block; 10. a storage bin; 11. a second cover plate; 12. a pipeline.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functionality. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Example 1
Referring to fig. 1-5, the present invention provides a technical solution: the graphene pretreatment grinding device comprises a base 1, wherein the top of the base 1 is fixedly connected with a grinding hopper 3, the outer wall of the grinding hopper 3 is fixedly connected with a temporary storage box 4, the top of the temporary storage box 4 is clamped with a first cover plate 5, the position of the top of the base 1, which is positioned on the right side of the grinding hopper 3, is fixedly connected with a water tank 2, and the inner wall of the water tank 2 is fixedly connected with a grinding mechanism 6;
The grinding mechanism 6 includes:
the grinding roller 67, the right side of the grinding roller 67 is inserted into the left side of the water tank 2, waterproof elastic cloth 66 is fixedly connected between the grinding roller 67 and the water tank 2, a cavity is formed in the grinding roller 67, the grinding roller 67 is connected with the water tank 2 through the waterproof elastic cloth 66, and the grinding roller 67, the waterproof elastic cloth 66 and the water tank 2 are closed spaces;
The slide bar 61, the slide bar 61 is fixedly connected to the top of the water tank 2;
the electric slide block 64, the electric slide block 64 is connected to the outer wall of the slide bar 61 in a sliding way.
The outer wall of the electric slide block 64 is fixedly connected with a driving plate 62, and a first spring 65 is fixedly connected between the outer wall of the driving plate 62 and the inner left side of the grinding roller 67.
The left side of the driving plate 62 is fixedly connected with a squeeze rod 63, and the squeeze rod 63 is movably contacted with the right side of the grinding roller 67.
The outer wall fixedly connected with interception mechanism 7 of grinding roller 67, interception mechanism 7 includes air pressure plate 76, and air pressure plate 76 cup joints the outer wall at grinding roller 67.
An air inlet 73 is formed in the outer wall of the air pressure plate 76, an interception plate 72 is inserted in the left side of the air inlet 73, a second spring 71 is fixedly connected between the outer wall of the interception plate 72 and the outer wall of the air pressure plate 76, and the air pressure plate 76 is inserted in the right side of the grinding bucket 3.
The left side fixedly connected with support 74 of water tank 2, the outer wall fixedly connected with interception ring 75 of support 74, interception ring 75 and grinding roller 67 movable contact.
The top fixedly connected with pipeline 12 of grinding fill 3, the left side fixedly connected with storage bin 10 of pipeline 12, the front joint of storage bin 10 has second apron 11, and the hole is seted up at the top of storage bin 10, and the downthehole fixedly connected with sponge piece 9 in storage bin 10 top, the bottom of storage bin 10 and the top fixed connection of base 1.
When in use, a proper amount of water is added into the water tank 2 in advance, then graphene to be ground is put into the temporary storage box 4, then the first cover plate 5 is closed on the temporary storage box 4 to further seal the temporary storage box 4, the graphene in the temporary storage box 4 can drop into the grinding hopper 3, then the electric sliding block 64 is electrified and started, the electric sliding block 64 is positioned on the sliding rod 61 and drives the driving plate 62 to move towards the left, the water in the water tank 2 is driven to roll towards the left when the driving plate 62 moves, the grinding roller 67 is impacted by the water flow movement, the grinding roller 67 can squeeze the graphene in the grinding hopper 3 under the impact of the water, the water level in the grinding roller 67 can reduce the temperature of the grinding roller 67, so that the temperature of the graphene is reduced, and the driving plate 62 is continuously moved left and right to continuously drive the water flow, the temperature of the water flow can be reduced in the flowing process, the temperature of the graphene is further reduced, the graphene is extruded to the right side of the grinding roller 67 through the extrusion rod 63 under the continuous movement of the driving plate 62, then the extrusion force of the grinding roller 67 to the graphene is increased, then the harder graphene blocks are extruded to be crushed, then after the driving plate 62 returns, the grinding roller 67 is driven to reset under the pulling of the first spring 65, the interception ring 75 is arranged on the left side of the water tank 2 through the bracket 74, then the interception ring 75 limits the grinding roller 67, the grinding roller 67 is prevented from continuously moving towards the left side, the grinding bucket 3 is fixedly arranged on the base 1, then the grinding roller 67 is positioned in the grinding bucket 3 to move, the air pressure plate 76 is driven to extrude the air in the grinding bucket 3, then the air on the right side of the grinding bucket 3 is moved towards the left side, in the process, graphene on the right side in the grinding bucket 3 is driven to move to the left, the graphene is pushed to move to the left by the movement of the air pressure plate 76, then the grinding roller 67 and the inner wall of the grinding bucket 3 grind the graphene, air in the grinding bucket 3 is extruded to blow out towards the pipeline 12 when the air pressure plate 76 is positioned in the grinding bucket 3 and moves to the left, the air flow passes through the pipeline 12 and then enters the storage bin 10, the air flow passes through the sponge block 9 on the storage bin 10, the air flow is carried up to float the graphene in the grinding bucket 3 when being separated from the grinding bucket 3, then the graphene is filtered by the sponge block 9, the graphene is positioned in the storage bin 10, then the air flow is discharged after being filtered by the sponge block 9, then the air pressure plate 76 is driven to move to the right by the grinding roller 67, a plate at a limiting position is arranged on the right side of the grinding bucket 3, and the air pressure plate 76 is prevented from falling off from the grinding bucket 3, and then the air flow is blocked by the top plate 72 to enter the grinding bucket 3 through the air inlet 73 in the process of moving to the right.
Example two
Referring to fig. 1-8, the present invention provides a technical solution based on the first embodiment:
The outer wall fixedly connected with grinding mechanism 8 of grinding fill 3, grinding mechanism 8 includes that first storehouse 84 and second are placed in storehouse 85, first storehouse 84 and second are placed in storehouse 85 and are placed the back side and the front of grinding fill 3 respectively fixed connection, grind fill 3, first storehouse 84 and the inside intercommunication of storehouse 85 are placed to the second, the inner wall fixedly connected with fan 83 of storehouse 85 is placed to the second, the outer wall rotation of fan 83 is connected with rotor 82, rotor 82's outer wall fixedly connected with crushing rod 81, fan 83's right side fixedly connected with outlet duct 86's one end, outlet duct 86's the other end fixed connection is in grinding the bottom of fill 3, fan 83 adopts the current device in the market, fan 83 outer wall has been seted up and has been rotated the hole of roller 82 looks adaptation size, rotor 82's one end links to each other with the main shaft of flabellum.
During the use, the promotion graphite alkene through grinding roller 67 can be located between grinding roller 67 left side and grinding fill 3 in the left side, then fan 83 circular telegram starts, fan 83 passes through outlet duct 86 and connects in grinding fill 3's bottom, then blow out the air current and to grinding fill 3 in, the flow of air current can reduce the temperature of graphite alkene, and the air current also can drive grinding fill 3 in the graphite alkene that is smashed and float, then the air current carries graphite alkene powder to pass through pipeline 12 and stores in storage bin 10, can produce the rotation in the fan 83 course of working, then utilize the rotation of fan 83 inside flabellum to drive the rotation of rotor 82, rotor 82 can drive crushing rod 81 rotation, cut graphite alkene when crushing rod 81 is rotatory, then crushing rod 81 is elastic metal material, then when the inner wall to grinding fill 3 is extruded in, crushing rod 81 can be extruded shrink, and then make crushing rod 81 can graphite alkene extrusion in shrink process smash, second apron 11 on the storage bin 10 is opened at last take out the graphite alkene powder that stores in the storage bin 10.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (2)
1. Graphene pretreatment grinding equipment comprises a base (1), and is characterized in that: the grinding machine comprises a base (1), wherein the top of the base is fixedly connected with a grinding hopper (3), the outer wall of the grinding hopper (3) is fixedly connected with a temporary storage box (4), the top of the temporary storage box (4) is clamped with a first cover plate (5), the position, located on the right side of the grinding hopper (3), of the top of the base (1) is fixedly connected with a water tank (2), and the inner wall of the water tank (2) is fixedly connected with a grinding mechanism (6);
The grinding mechanism (6) comprises:
the grinding roller (67), the right side of grinding roller (67) is pegged graft in the left side of water tank (2), fixedly connected with waterproof elastic cloth (66) between grinding roller (67) and water tank (2), the inside of grinding roller (67) has seted up the cavity, the cavity with water tank (2) intercommunication;
The sliding rod (61) is fixedly connected to the top of the water tank (2);
The electric sliding block (64) is connected to the outer wall of the sliding rod (61) in a sliding way;
The outer wall of the grinding roller (67) is fixedly connected with an interception mechanism (7), the interception mechanism (7) comprises an air pressure plate (76), and the air pressure plate (76) is sleeved on the outer wall of the grinding roller (67); an air inlet (73) is formed in the outer wall of the air pressure plate (76), an interception plate (72) is inserted into the left side of the air inlet (73), a second spring (71) is fixedly connected between the outer wall of the interception plate (72) and the outer wall of the air pressure plate (76), and the air pressure plate (76) is inserted into the right side of the grinding bucket (3);
The grinding machine comprises a grinding hopper (3), wherein the outer wall of the grinding hopper (3) is fixedly connected with a grinding mechanism (8), the grinding mechanism (8) comprises a first placing bin (84) and a second placing bin (85), the first placing bin (84) and the second placing bin (85) are respectively and fixedly connected with the back side and the front side of the grinding hopper (3), the first placing bin (84) and the second placing bin (85) are internally communicated, the inner wall of the second placing bin (85) is fixedly connected with a fan (83), the outer wall of the fan (83) is rotationally connected with a rotating roller (82), the outer wall of the rotating roller (82) is fixedly connected with a grinding rod (81), one end of an air outlet pipe (86) is fixedly connected to the right side of the fan (83), and the other end of the air outlet pipe (86) is fixedly connected to the bottom of the grinding hopper (3);
The outer wall of the electric sliding block (64) is fixedly connected with a driving plate (62), and a first spring (65) is fixedly connected between the outer wall of the driving plate (62) and the inner left side of the grinding roller (67); the left side of the driving plate (62) is fixedly connected with an extrusion rod (63), and the extrusion rod (63) is movably contacted with the right side of the grinding roller (67);
The grinding hopper is characterized in that a pipeline (12) is fixedly connected to the top of the grinding hopper (3), a storage bin (10) is fixedly connected to the left side of the pipeline (12), a second cover plate (11) is clamped on the front side of the storage bin (10), a hole is formed in the top of the storage bin (10), a sponge block (9) is fixedly connected to the inside of the hole in the top of the storage bin (10), and the bottom of the storage bin (10) is fixedly connected with the top of the base (1).
2. The graphene pretreatment grinding device according to claim 1, wherein: the left side fixedly connected with support (74) of water tank (2), the outer wall fixedly connected with interception ring (75) of support (74), interception ring (75) and grinding roller (67) movable contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410246364.1A CN117839843B (en) | 2024-03-05 | 2024-03-05 | Graphene pretreatment grinding equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410246364.1A CN117839843B (en) | 2024-03-05 | 2024-03-05 | Graphene pretreatment grinding equipment |
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| CN117839843A CN117839843A (en) | 2024-04-09 |
| CN117839843B true CN117839843B (en) | 2024-05-31 |
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| CN117839843A (en) | 2024-04-09 |
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