Uniformly-dispersed mixing equipment for graphite negative electrode production

Abstract

The invention belongs to the technical field of graphite production equipment, and particularly discloses uniformly dispersed mixing equipment for graphite cathode production, which comprises a kettle body, the bottom of the kettle body is communicated with a discharge pipe, and the surface of the kettle body is communicated with a feed pipe; by means of a transmission system composed of the driving ring, the outer gear ring, the gear and the inner gear ring, differential motion is generated between the first grinding block directly driven by the rotating shaft and the second grinding block driven by the rotating ring with the speed changed through the gear, and the differential motion forms strong shearing force in the staggered area of the first grinding block and the second grinding block; the first grinding block and the second grinding block can effectively cut soft aggregate formed by graphite and a coating agent, and meanwhile, the gap between the first grinding block and the second grinding block is gradually reduced along with the distance away from the rotating shaft, so that when materials move outwards under the centrifugal effect, the materials can be subjected to the stage treatment process from coarse crushing to fine grinding, the dispersion uniformity is remarkably improved, uneven coating is avoided, and the service life of the materials is prolonged. And abrasion to equipment caused by one-time excessive grinding is effectively reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of graphite production equipment, and specifically discloses a mixing device for producing uniformly dispersed graphite anodes. Background Technology

[0002] In the field of lithium-ion battery manufacturing, graphite is widely used as a negative electrode active material due to its high specific capacity, good conductivity, and stable electrochemical performance. To improve the electrochemical performance and cycle life of graphite negative electrodes, it is usually necessary to coat its surface, such as by carbon coating, to improve interface stability, inhibit electrolyte decomposition, and improve initial coulombic efficiency.

[0003] One of the core steps in this coating process is to thoroughly and uniformly mix and disperse the graphite substrate and the coating agent in a solvent. Currently, the industry commonly uses mixing tanks equipped with stirring devices for this operation. Conventional mixing tanks achieve initial mixing by mechanically stirring the materials using motor-driven stirring blades installed inside the tank.

[0004] However, graphite materials have a large specific surface area and are prone to agglomeration during wet mixing, forming solid agglomerates. The macroscopic shear force generated by traditional stirring blades is relatively weak and it is difficult to effectively break up these agglomerates.

[0005] Therefore, those skilled in the art have proposed a mixing device for producing uniformly dispersed graphite anodes to solve the problems mentioned above. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to propose a uniformly dispersed mixing device for the production of graphite anodes, so as to solve the problem that agglomerates exist in the mixing process of existing equipment and affect the mixing effect.

[0007] To achieve the above objectives, the present invention provides a uniformly dispersed mixing device for the production of graphite anodes, comprising a vessel body, a discharge pipe connected to the bottom of the vessel body, a feed pipe connected to the surface of the vessel body, a motor installed at the top of the vessel body, the output shaft of the motor passing through the vessel body and fixedly connected to a rotating shaft located inside the vessel body, a uniformly distributed stirring rod fixedly connected to the surface of the rotating shaft, and a dispersion structure located inside the vessel body provided on the surface of the rotating shaft. The dispersion structure includes a drive blade fixedly connected to the surface of the rotating shaft, and the surface of the rotating shaft is provided with a processing module located between the drive blade and the bottommost stirring rod.

[0008] In the above technical solution, preferably, the processing module includes a mounting plate fixedly connected to the surface of the rotating shaft. The top surface of the mounting plate is conical, and a number of first grinding blocks arranged in a ring are fixedly connected to the top of the mounting plate, with each group of first grinding blocks having no less than six blocks.

[0009] In the above technical solution, preferably, the surface of the rotating shaft is fitted with a connecting shell located above the mounting plate, the surface of the connecting shell is fixedly connected with uniformly distributed mounting rods, the other end of the mounting rods is fixedly connected to the inner wall of the vessel, the top of the mounting plate extends into the interior of the connecting shell, the surface of the connecting shell is provided with uniformly distributed discharge grooves, and the top of the connecting shell is connected to an inlet shell.

[0010] In the above technical solution, preferably, a drive ring is rotatably connected to the inner wall of the connecting shell, and a uniformly distributed fixing rod is fixedly connected to the inner wall of the drive ring. The other end of the fixing rod is fixedly connected to the surface of the rotating shaft, and an external toothed ring is provided on the outer side of the drive ring.

[0011] In the above technical solution, preferably, a rotating ring is rotatably connected to the inner wall of the connecting shell, the driving ring is located inside the rotating ring, and an internal toothed ring is fixedly connected to the inner side of the rotating ring.

[0012] In the above technical solution, preferably, a uniformly distributed gear is provided between the rotating ring and the driving ring, the top of the gear is rotatably connected to the inner wall of the connecting shell, and both the outer gear ring and the inner gear ring are meshed with the gear.

[0013] In the above technical solution, preferably, a connecting ring is fixedly connected to the inner side of the rotating ring, and the connecting ring blocks the gap between the driving ring and the rotating ring.

[0014] In the above technical solution, preferably, the bottom of the rotating ring is fixedly connected to a uniformly distributed fixing plate, and the bottom of the fixing plate is fixedly connected to a second grinding block that is staggered with the first grinding block. The gap between the first grinding block and the second grinding block decreases as the distance away from the rotating shaft increases.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention utilizes a transmission system composed of a drive ring, an external gear ring, gears, and an internal gear ring to generate differential motion between the first grinding block directly driven by the rotating shaft and the second grinding block driven by the rotating ring through gear speed change. This differential motion generates a strong shearing force in the intersecting area of ​​the first and second grinding blocks, which can effectively cut soft agglomerates formed by graphite and coating agent. At the same time, the gap between the first and second grinding blocks is set to gradually decrease as it moves away from the rotating shaft. This allows the material to undergo a graded processing process from coarse crushing to fine grinding when it moves outward under centrifugal force, which not only significantly improves the dispersion uniformity and avoids uneven coating, but also effectively reduces the wear on the equipment caused by excessive grinding in one go. 2. This invention actively pushes the material at the bottom of the vessel downwards by rotating the drive blades on the shaft, thereby creating a negative pressure zone above the drive blades and at the inlet of the inlet shell. This negative pressure effect drives the material around the vessel and at the bottom to flow back upwards along the inner wall and be continuously collected into the connecting shell for processing through the inlet shell. This enables the formation of a forced main flow field driven by the drive blades inside the float, which, combined with the dispersing effect of the processing module, ensures that the material in all areas of the vessel can be repeatedly captured and sent into the dispersing structure for processing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 This is a schematic diagram of the dispersed structure of the present invention; Figure 4 This is a schematic diagram illustrating the separation of the dispersed structure of the present invention; Figure 5 This is a schematic diagram showing the connection of the driving ring, connecting ring, and fixing plate of the present invention; Figure 6 for Figure 5 A magnified view of A in the middle.

[0017] In the diagram: 1. Kettle body; 101. Feed pipe; 102. Discharge pipe; 2. Motor; 201. Rotating shaft; 202. Stirring rod; 3. Dispersion structure; 301. Drive blade; 302. Connecting shell; 303. Inlet shell; 304. Mounting rod; 305. Discharge groove; 306. Mounting plate; 307. First grinding block; 308. Rotating ring; 309. Fixing rod; 310. Drive ring; 311. Fixing plate; 312. Second grinding block; 313. External gear ring; 314. Connecting ring; 315. Gear; 316. Internal gear ring. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0020] like Figures 1-6The graphite anode production uniformly dispersed mixing equipment shown includes a vessel body 1, a discharge pipe 102 connected to the bottom of the vessel body 1, a feed pipe 101 connected to the surface of the vessel body 1, a motor 2 installed at the top of the vessel body 1, the output shaft of the motor 2 passing through the vessel body 1 and fixedly connected to a rotating shaft 201 located inside the vessel body 1, a uniformly distributed stirring rod 202 fixedly connected to the surface of the rotating shaft 201, and a dispersion structure 3 located inside the vessel body 1 provided on the surface of the rotating shaft 201. The dispersion structure 3 includes a drive blade 301 fixedly connected to the surface of the rotating shaft 201, and a processing module located between the drive blade 301 and the lowest stirring rod 202 is provided on the surface of the rotating shaft 201.

[0021] By starting the motor 2 to drive the rotating shaft 201 to rotate, the stirring rod 202 can be driven to rotate synchronously, so that the coating agent and graphite material are stirred and mixed after being put into the reactor body 1. During this process, the rotating shaft 201 can drive the drive blade 301 to rotate synchronously. As the drive blade 301 rotates, it can push the raw materials inside to flow downward, so that a low-pressure area is formed above, allowing the raw materials in other positions to move to the area above the drive blade 301.

[0022] like Figures 1-6 As shown, the processing module includes a mounting plate 306 fixedly connected to the surface of the rotating shaft 201. The top surface of the mounting plate 306 is conical. Several groups of first grinding blocks 307 arranged in a ring are fixedly connected to the top of the mounting plate 306. Each group of first grinding blocks 307 has no less than six blocks.

[0023] A connecting shell 302 located above the mounting plate 306 is fitted on the surface of the rotating shaft 201. Evenly distributed mounting rods 304 are fixedly connected to the surface of the connecting shell 302. The other end of the mounting rods 304 is fixedly connected to the inner wall of the vessel body 1. The top of the mounting plate 306 extends into the interior of the connecting shell 302. Evenly distributed discharge grooves 305 are opened on the surface of the connecting shell 302. The top of the connecting shell 302 is connected to the inlet shell 303.

[0024] The design of the inlet shell 303 facilitates the collection and guidance of raw materials from other locations as they move towards the area above the drive blade 301, allowing them to flow into the interior of the connecting shell 302. The raw materials entering the connecting shell 302 are ground and dispersed by the cooperation of the first grinding block 307 and the second grinding block 312, reducing the uneven mixing caused by agglomerated raw materials. The ground and dispersed raw materials that meet the specifications can be discharged through the discharge trough 305 and flow downwards under the drive of the rotation of the drive blade 301. With the low-pressure suction of the upper space, the raw materials at the bottom can flow upwards along the inner wall of the vessel body 1.

[0025] like Figures 1-6As shown, a drive ring 310 is rotatably connected to the inner wall of the connecting shell 302. A uniformly distributed fixing rod 309 is fixedly connected to the inner wall of the drive ring 310. The other end of the fixing rod 309 is fixedly connected to the surface of the rotating shaft 201. An external toothed ring 313 is provided on the outer side of the drive ring 310.

[0026] A rotating ring 308 is rotatably connected to the inner wall of the connecting shell 302. A driving ring 310 is located inside the rotating ring 308. An internal toothed ring 316 is fixedly connected to the inner side of the rotating ring 308.

[0027] A uniformly distributed gear 315 is provided between the rotating ring 308 and the drive ring 310. The top of the gear 315 is rotatably connected to the inner wall of the connecting shell 302. The outer gear ring 313 and the inner gear ring 316 are both meshed with the gear 315.

[0028] A connecting ring 314 is fixedly connected to the inner side of the rotating ring 308, and the connecting ring 314 blocks the gap between the driving ring 310 and the rotating ring 308.

[0029] The bottom of the rotating ring 308 is fixedly connected to a uniformly distributed fixing plate 311, and the bottom of the fixing plate 311 is fixedly connected to a second grinding block 312 that is staggered with the first grinding block 307. The gap between the first grinding block 307 and the second grinding block 312 decreases as the distance away from the rotating shaft 201 increases.

[0030] During the rotation of the rotating shaft 201, the fixed rod 309 can rotate synchronously, which in turn drives the drive ring 310 to rotate in the same step. During this process, the external gear ring 313 can rotate the gear 315 that meshes with it. Under the rotation of the gear 315, the internal gear ring 316 is driven to rotate the rotating ring 308 synchronously. The setting of the gear 315 makes the rotation of the rotating ring 308 driven by the external gear ring 313 and the rotating shaft 201 have a speed difference. Furthermore, due to the connection between the rotating shaft 201 and the mounting plate 306, there is a speed difference between the rotation of the rotating ring 308 and the mounting plate 306. At the same time, during the rotation of the rotating ring 308, the fixed plate 311 is driven to rotate synchronously, which in turn drives the second grinding block 312 to rotate synchronously. Under the action of the speed difference between the two, a shearing force can be generated to shear the raw material introduced into the connecting shell 302, causing the agglomerated raw material to break up and separate, thereby achieving the purpose of dispersion. The first grinding block 307 and the second grinding block 312 are staggered. The gap between the first grinding block 307 and the second grinding block 312 decreases as the distance from the rotating shaft 201 increases. This allows the material to be gradually ground and dispersed as it flows outward. Furthermore, because the gap between the first grinding block 307 and the second grinding block 312 decreases as the distance from the rotating shaft 201 increases, the diameter of the material being ground and dispersed decreases from large to small, thus improving the grinding effect and reducing wear on the device.

[0031] Working principle: Raw materials are introduced into the interior of the reactor body 1 through the feed pipe 101. During this process, the motor 2 is started, which drives the rotating shaft 201 to rotate. This rotation drives the drive blade 301 to rotate synchronously, causing the raw materials to flow downwards. After the raw materials are pushed away, a local low-pressure zone is formed above the drive blade 301 and at the inlet of the inlet shell 303. Under the action of pressure difference, the raw materials at the bottom and periphery of the reactor body 1 flow upwards along the reactor wall, replenishing the low-pressure zone. They are then collected by the inlet shell 303 and introduced into the interior of the connecting shell 302 for further processing. Under the action of the module, the raw materials are ground and dispersed. With the cooperation of the outer gear ring 313, gear 315 and inner gear ring 316, the first grinding block 307 directly driven by the rotating shaft 201 and the second grinding block 312 which is changed by the gear 315 produce a precise differential speed, thereby forming a strong shearing force in the intersecting area to tear and cut the clumps. At the same time, the gap gradually decreases from the inside to the outside to realize the graded grinding of the material, ensuring the dispersion effect from coarse to fine. Finally, qualified material is thrown out from the discharge tank 305 and re-participates in the overall mixing.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A mixing device for producing uniformly dispersed graphite anodes, comprising a reactor body (1), characterized in that, The bottom of the vessel body (1) is connected to a discharge pipe (102), the surface of the vessel body (1) is connected to a feed pipe (101), the top of the vessel body (1) is provided with a motor (2), the output shaft of the motor (2) passes through the vessel body (1) and is fixedly connected to a rotating shaft (201) located inside the vessel body (1), the surface of the rotating shaft (201) is fixedly connected with uniformly distributed stirring rods (202), and the surface of the rotating shaft (201) is provided with a dispersion structure (3) located inside the vessel body (1); The dispersion structure (3) includes a drive blade (301) fixedly connected to the surface of the rotating shaft (201), and the surface of the rotating shaft (201) is provided with a processing module located between the drive blade (301) and the bottommost stirring rod (202).

2. The mixing equipment for uniformly dispersing graphite anodes according to claim 1, characterized in that, The processing module includes a mounting plate (306) fixedly connected to the surface of the rotating shaft (201). The top surface of the mounting plate (306) is conical. Several groups of first grinding blocks (307) arranged in a ring are fixedly connected to the top of the mounting plate (306). The number of first grinding blocks (307) in each group is not less than six.

3. The mixing equipment for uniformly dispersing graphite anodes according to claim 2, characterized in that, The surface of the rotating shaft (201) is fitted with a connecting shell (302) located above the mounting plate (306). The surface of the connecting shell (302) is fixedly connected with uniformly distributed mounting rods (304). The other end of the mounting rods (304) is fixedly connected to the inner wall of the vessel body (1). The top of the mounting plate (306) extends into the interior of the connecting shell (302). The surface of the connecting shell (302) is provided with uniformly distributed discharge grooves (305). The top of the connecting shell (302) is connected to an inlet shell (303).

4. The mixing equipment for uniformly dispersing graphite anodes according to claim 3, characterized in that, The inner wall of the connecting shell (302) is rotatably connected to a drive ring (310), and the inner wall of the drive ring (310) is fixedly connected to evenly distributed fixing rods (309). The other end of the fixing rods (309) is fixedly connected to the surface of the rotating shaft (201), and an external toothed ring (313) is provided on the outer side of the drive ring (310).

5. The mixing equipment for uniformly dispersing graphite anodes according to claim 4, characterized in that, The inner wall of the connecting shell (302) is rotatably connected to a rotating ring (308), the driving ring (310) is located inside the rotating ring (308), and an internal toothed ring (316) is fixedly connected to the inner side of the rotating ring (308).

6. The mixing equipment for uniformly dispersing graphite anodes according to claim 5, characterized in that, A uniformly distributed gear (315) is provided between the rotating ring (308) and the driving ring (310). The top of the gear (315) is rotatably connected to the inner wall of the connecting shell (302). The outer gear ring (313) and the inner gear ring (316) are both meshed with the gear (315).

7. The mixing equipment for uniformly dispersing graphite anodes according to claim 6, characterized in that, A connecting ring (314) is fixedly connected to the inner side of the rotating ring (308), and the connecting ring (314) blocks the gap between the driving ring (310) and the rotating ring (308).

8. The mixing equipment for uniformly dispersing graphite anodes according to claim 7, characterized in that, The bottom of the rotating ring (308) is fixedly connected to a uniformly distributed fixing plate (311), and the bottom of the fixing plate (311) is fixedly connected to a second grinding block (312) that is staggered with the first grinding block (307). The gap between the first grinding block (307) and the second grinding block (312) decreases as the distance away from the rotating shaft (201) increases.

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