Graphite polishing apparatus

Abstract

The application discloses a graphite grinding device, and belongs to the technical field of graphite grinding. The graphite grinding device comprises a shell, an impeller mechanism and a grinding disc mechanism. The shell is provided with a feeding port, a discharging port and a grinding cavity. The impeller mechanism is arranged at the discharging port. The grinding disc mechanism comprises a grinding disc, a grinding block and a first driving piece. The grinding disc is rotatably arranged in the grinding cavity and is in transmission connection with the first driving piece. The grinding block is connected to the lower side of the grinding disc. The graphite grinding device reduces the impact of the gravity direction on the spherical graphite by arranging the grinding block on the lower side of the grinding disc, i.e. inverting the grinding disc. The spherical graphite is subjected to the shearing force, the friction force and the extrusion rolling force, the generation of irregular particle fragments is reduced, the finished product particle size distribution is more concentrated, the over-pulverization phenomenon is reduced, and the tap density is improved.

Description

Technical Field

[0001] This application relates to the field of graphite grinding technology, and more particularly to a graphite grinding apparatus. Background Technology

[0002] In the preparation process of spherical graphite materials, the raw material crushing process is the core front-end step. The optimization and control of its process parameters directly determine the structural integrity and physical properties of the finished spherical graphite, such as particle size, tap density, and specific surface area.

[0003] Currently, in related technical fields, there is a problem of excessive grinding of graphite particles in grinding devices, resulting in a large number of fine particles, which leads to a wide particle size distribution and low tap density. Utility Model Content

[0004] This application provides a graphite grinding apparatus to at least partially solve the above-mentioned technical problems.

[0005] To achieve the above objectives, this application provides a graphite grinding apparatus, including a housing, an impeller mechanism, and a grinding disc mechanism. The housing has a feed inlet, a discharge outlet, and a grinding chamber. The impeller mechanism is located at the discharge outlet. The grinding disc mechanism includes a grinding disc, a grinding block, and a first driving member. The grinding disc is rotatably disposed within the grinding chamber and is connected to the first driving member. The grinding block is connected to the lower side of the grinding disc.

[0006] Optionally, the grinding block has a first curved surface located on the outer side of the grinding disk in the radial direction.

[0007] Optionally, the grinding block is an elliptical cylinder with a major axis length L1 of 60mm-100mm, a minor axis length L2 of 30mm-50mm, and a height L3 of 30mm-60mm.

[0008] Optionally, there are multiple grinding blocks, which are arranged at intervals on the underside of the grinding disc around the rotation axis of the grinding disc.

[0009] Optionally, the grinding chamber includes multiple grinding teeth, which are spaced apart on the inner wall of the grinding chamber.

[0010] Optionally, the distance L4 between the bottom surface of the grinding chamber and the top surface of the outer shell is 1000mm-1500mm.

[0011] Optionally, the discharge port is located at the top of the housing, and the impeller mechanism includes an impeller and a second driving member. The second driving member is connected to the housing, and the impeller is located inside the housing. The impeller is driven by the second driving member.

[0012] Optionally, a filter is also included, which is at least partially disposed on the underside of the impeller.

[0013] Optionally, the grinding disc mechanism further includes a drive shaft, a first drive wheel, a second drive wheel, and a transmission component. One end of the drive shaft is connected to the grinding disc, and the other end is connected to the first drive wheel. The output end of the first drive component is connected to the second drive wheel, and the transmission component drives the first drive wheel and the second drive wheel.

[0014] Optionally, the grinding disc mechanism further includes a connector, a cover plate, a first bolt, and a second bolt. The grinding disc has a first connecting hole. The connector includes a connecting part and an abutting part. The connecting part has a second connecting hole. The drive shaft is connected in the second connecting hole. The connecting part is disposed in the first connecting hole. The first bolt connects the abutting part and the grinding disc. The abutting part abuts against the upper side of the grinding disc. The second bolt connects the cover plate and the drive shaft. The cover plate abuts against the upper side of the connecting part.

[0015] The graphite grinding apparatus of this application reduces the impact of gravity on the spherical graphite by placing the grinding block on the underside of the grinding disc, i.e., the grinding disc is inverted. The spherical graphite is subjected to shear force, friction force and extrusion rolling force, which reduces the generation of irregular particle fragments, makes the particle size distribution of the finished product more concentrated, reduces over-grinding, and improves the tap density.

[0016] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0018] Figure 1 This is a schematic diagram of a graphite grinding apparatus in one embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of a graphite grinding apparatus in one embodiment of this application; Figure 3 yes Figure 2 A magnified view of a portion of the image; Figure 4 This is a schematic diagram of a grinding disc in one embodiment of this application; Figure 5 This is a schematic diagram of a grinding block in one embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 1. Outer shell; 11. Inlet; 12. Outlet; 13. Grinding chamber; 131. Grinding teeth; 2. Impeller mechanism; 21. Impeller; 22. Second drive component; 3. Grinding disc mechanism; 31. Grinding disc; 311. First connecting hole; 32. Grinding block; 321. First curved surface; 33. First drive component; 341. Drive shaft; 342. First drive wheel; 343. Second drive wheel; 351. Connecting component; 3511. Connecting part; 35111. Second connecting hole; 3512. Abutment part; 352. Cover plate; 353. First bolt; 354. Second bolt; 4. Filter. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0021] In current technological fields, during the grinding process, spherical graphite undergoes intense impacts under the combined effects of gravity and centrifugal force, easily generating irregular particle fragments. This leads to over-grinding of the particles, producing a large number of fine particles and resulting in a wide particle size distribution. The large gaps between irregularly shaped particles during accumulation, coupled with the tendency of excessively fine powder to "bridge" and hinder compact packing, and the wide particle size distribution making it difficult for small particles to fill the gaps between larger particles, results in a lower tap density.

[0022] Please see Figure 1 , Figure 2 The graphite grinding apparatus provided in this application includes a housing 1, an impeller mechanism 2, and a grinding disc mechanism 3. The housing 1 has a feed inlet 11, a discharge outlet 12, and a grinding chamber 13. The impeller mechanism 2 is disposed at the discharge outlet 12. The grinding disc mechanism 3 includes a grinding disc 31, a grinding block 32, and a first driving member 33. The first driving member 33 can be a motor. The grinding disc 31 is rotatably disposed in the grinding chamber 13 and is connected to the first driving member 33 in a transmission connection. The grinding block 32 is connected to the lower side of the grinding disc 31.

[0023] The graphite grinding apparatus of this application operates as follows: First, large pieces of graphite are fed into the outer casing 1 of the graphite grinding apparatus through the feed inlet 11. The graphite naturally falls into the grinding chamber 13 at the bottom of the outer casing 1. Inside the grinding chamber 13, a rotating drive disc rotates, causing the grinding blocks 32 mounted on it to rotate as well. These blocks form a small gap with the inner wall of the grinding chamber 13, thereby fully compressing and crushing the graphite blocks, ultimately forming fine graphite particles. After grinding, the graphite particles are extracted through the impeller mechanism 2 and transported from the discharge outlet 12 to the next process for further processing and utilization.

[0024] The graphite grinding apparatus proposed in this application places the grinding block 32 on the lower side of the grinding disc 31, i.e., the grinding disc 31 is inverted. This effectively reduces the impact on spherical graphite under gravity. During the grinding process, the spherical graphite is mainly subjected to shear force, friction force, and extrusion rolling force. This combination of multiple forces not only reduces the generation of irregular particle fragments but also makes the particle size distribution of the finished product more concentrated. In addition, this design can significantly reduce over-grinding, ensuring product consistency and thus improving the tap density of graphite particles.

[0025] In related technical fields, long grinding blocks are commonly used for material processing. These long grinding blocks simultaneously perform the dual functions of crushing and shaping graphite. However, the grinding blocks 32 at different locations experience varying forces during use, leading to inconsistent wear levels. Due to this improper force distribution, the grinding blocks 32 cannot achieve optimal performance during crushing and shaping, resulting in an excessively wide particle size distribution in the processed product and affecting product consistency.

[0026] To resolve this issue, please refer to Figure 4 In some embodiments, the grinding block 32 has a first curved surface 321 located on the radially outer side of the grinding disc 31. By utilizing the contact, friction, and compression between the first curved surface 321 and the graphite, the force distribution and movement trajectory of the graphite during the grinding process can be effectively changed, thereby optimizing the crushing effect, making the particle size distribution of the finished product more concentrated, reducing over-grinding, and giving the graphite particles better fluidity and denser packing ability, improving product consistency, and thus significantly increasing the tap density.

[0027] Please see Figure 5 In some embodiments, the grinding block 32 is an elliptical cylinder with a major axis length L1 of 60mm-100mm, a minor axis length L2 of 30mm-50mm, and a height L3 of 30mm-60mm. The first curved surface 321 is one of the curved surfaces corresponding to the major axis of the ellipse. By selecting the appropriate size of the grinding block 32, the grinding effect is improved. In other embodiments, depending on the production needs of graphite powder, the major axis length L1 can be selected from any value or a range between any two values ​​of 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, and 100mm; the minor axis length L2 can be selected from any value or a range between any two values ​​of 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 42mm, 44mm, 46mm, 48mm, and 50mm; and the height L3 can be selected from any value or a range between any two values ​​of 30mm, 33mm, 36mm, 39mm, 42mm, 45mm, 48mm, 51mm, 54mm, 57mm, and 60mm.

[0028] Please see Figure 4 In some embodiments, there are multiple grinding blocks 32, which are arranged at intervals on the lower side of the grinding disk 31 around the rotation axis of the grinding disk 31. The number of grinding blocks 32 can be selected as 12, which are evenly arranged on the lower side of the grinding disk 31 to make the graphite grinding process more uniform and further improve product consistency.

[0029] Please see Figure 3 In some embodiments, the grinding chamber 13 includes a plurality of grinding teeth 131, which are spaced apart on the inner wall of the grinding chamber 13 to enhance grinding efficiency.

[0030] In related technical fields, the grinding chamber of graphite grinding devices is relatively high. The excessively high chamber causes the movement path of graphite in the grinding area to be significantly extended, resulting in graphite particles experiencing more disordered collisions and frictions in a strong shear force field. This can easily cause mechanical fracture of the graphite sheet structure, destroying its original layered arrangement. Furthermore, repeated collisions and frictions can lead to the generation of more micropores on the surface of graphite particles, increasing the specific surface area of ​​the material and significantly reducing the tap density, thus affecting its subsequent electrochemical performance in lithium-ion battery anode materials.

[0031] Please see Figure 2 To address the aforementioned issues, in some embodiments, the distance L4 between the bottom surface of the grinding chamber 13 and the top surface of the outer shell 1 is 1000mm-1500mm, which is the height of the crushing chamber. Employing a flatter chamber design than existing technologies, at the same power, reducing the chamber height means a significant increase in the vibration energy density input per unit volume. The shorter chamber has a larger cross-sectional area for the same volume, and the media layer is thinner in the vertical direction. Graphite particles are confined to a shallower media layer, reducing the distance required to penetrate it. The number of times particles traverse the media gaps per unit time increases significantly, multiplying the probability of being ground, sheared, and rolled. For applications seeking spherical particle shape, such as increasing tap density, frequent extrusion and rolling are more likely to occur in the shorter chamber. The particle crushing paths are similar, the contact frequencies are close, and the crushing process experienced by the graphite is more consistent, which is beneficial for producing products with a more concentrated particle size distribution. In other embodiments, depending on the production needs of graphite powder, L4 can be selected as any value or a range between any two values ​​from 1000mm, 1050mm, 1100mm, 1150mm, 1200mm, 1250mm, 1300mm, 1350mm, 1400mm, 1450mm, and 1500mm.

[0032] Please see Figure 2In some embodiments, the discharge port 12 is located at the top of the outer casing 1. The impeller mechanism 2 includes an impeller 21 and a second drive component 22, which can be a motor. The second drive component 22 is connected to the outer casing 1, and the impeller 21 is located inside the outer casing 1, with the impeller 21 drivingly connected to the second drive component 22. The pulverized graphite particles are extracted through the impeller mechanism 2 at the top of the outer casing 1 and enter the next process. By placing the discharge port 12 at the top of the outer casing 1 and coordinating a reasonable impeller 21 rotation speed, larger graphite particles that have not been fully ground can be prevented from being extracted under the influence of gravity.

[0033] Please see Figure 2 In some embodiments, a filter 4 is also included, connected inside the housing 1, and at least partially disposed on the underside of the impeller 21 to prevent larger graphite particles from being extracted. The filter 4 prevents larger graphite particles from being extracted due to excessively high impeller speed. Optionally, when the impeller 21 rotates at a relatively high speed, but not to the point of extracting larger graphite particles from the upper part of the impeller 21, a corresponding filter 4 may not be provided on the upper part of the impeller 21. Optionally, the filter 4 is disposed on the entire outer side of the impeller 21, completely covering the impeller 21, further preventing larger graphite particles from being extracted.

[0034] Please see Figure 3 In some embodiments, the grinding disc mechanism 3 further includes a drive shaft 341, a first drive wheel 342, a second drive wheel 343, and a transmission component. One end of the drive shaft 341 is connected to the grinding disc 31, and the other end is connected to the first drive wheel 342. The output end of the first drive component 33 is connected to the second drive wheel 343, and the transmission component drives the first drive wheel 342 and the second drive wheel 343. The first drive wheel 342 and the second drive wheel 343 can be selected as pulleys, synchronous pulleys, or gears, and the corresponding transmission component can be selected as a belt, synchronous belt, or gear transmission mechanism. The drive shaft 341 is rotated by the transmission component, thereby driving the grinding disc 31 to rotate. The positions of the drive shaft 341 and the first drive component 33 can be arranged according to actual needs to optimize the space occupied by the graphite grinding device.

[0035] Please see Figure 3In some embodiments, the grinding disc mechanism 3 further includes a connector 351, a cover plate 352, a first bolt 353, and a second bolt 354. The grinding disc 31 has a first connecting hole 311. The connector 351 includes a connecting portion 3511 and an abutting portion 3512. The connecting portion 3511 has a second connecting hole 35111. The drive shaft 341 is connected to the second connecting hole 35111. The connecting portion 3511 is disposed in the first connecting hole 311. The first bolt 353 connects to the abutting portion 3512. 12 and grinding disc 31, so that connecting piece 351 is connected to grinding disc 31. Abutting part 3512 abuts against the upper side of grinding disc 31. Second bolt 354 connects cover plate 352 and drive shaft 341, so that cover plate 352 and drive shaft 341 are connected together. Cover plate 352 abuts against the upper side of connecting part 3511, so that grinding disc 31 and connecting piece 351 will not come off from the shaft end. Optionally, a corresponding shoulder or limiting device is provided on drive shaft 341 to further limit the position of grinding disc 31.

[0036] The following section provides a detailed comparison between an existing graphite grinding device and the graphite grinding device described in this application: In this embodiment, the graphite grinding equipment uses 12 grinding blocks 32. The long axis length L1 of the grinding block 32 is 80mm, the short axis length L2 is 40mm, the height L3 is 50mm, and the distance L4 between the bottom surface of the grinding chamber 13 and the top surface of the outer shell 1 is 1200mm.

[0037] Embodiments of the graphite grinding equipment of this application: Step 1, Raw material preparation: Prepare conventional natural flake graphite with a tap density of 0.45 g / cm3; Step 2, feeding raw materials; Step 3: After the raw material enters the grinding chamber 13, it undergoes plastic deformation under the high-speed shearing and collision of the grinding blocks 32, gradually forming a spherical structure. Step 4: Measure the specific surface area using a Gobo specific surface area analyzer, measure the tap density using a CANTA tap density meter, and measure the particle size using an Omec laser particle size analyzer.

[0038] Comparative examples of existing graphite grinding equipment: Step 1, Raw material preparation: Prepare conventional natural flake graphite with a tap density of 0.45 g / cm3; Step 2, feeding raw materials; Step 3: After the raw material enters the grinding chamber 13, it undergoes plastic deformation under the high-speed shearing and collision of the grinding blocks 32, gradually forming a spherical structure. Step 4: Measure the specific surface area using a Gobo specific surface area analyzer, measure the tap density using a CANTA tap density meter, and measure the particle size using an Omec laser particle size analyzer.

[0039] The table below shows the particle size tap ratio data for the examples and comparative examples:

[0040] Wherein, Dmin is the smallest particle size in the sample, D10 is the particle size corresponding to a cumulative distribution of 10%, D50 is the particle size corresponding to a cumulative distribution of 50%, D90 is the particle size corresponding to a cumulative distribution of 90%, Dmax is the largest particle size in the sample, TAP is the tap density of the sample, and SSA is the specific surface area of ​​the sample. It can be seen that the graphite grinding device in this application produces better product consistency of graphite particles compared to existing graphite grinding devices.

[0041] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0043] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0044] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A graphite grinding device, characterized in that, include: The outer casing (1) has a feed inlet (11), a discharge outlet (12) and a grinding chamber (13), wherein the discharge outlet (12) is located on the top of the outer casing (1); An impeller mechanism (2) is provided at the discharge port (12); the impeller mechanism (2) includes an impeller (21) and a second drive member (22), the second drive member (22) is connected to the housing (1), the impeller (21) is provided inside the housing (1), and the impeller (21) is connected to the second drive member (22) in a driving connection. The grinding mechanism (3) includes a grinding disc (31), a grinding block (32) and a first driving member (33). The grinding disc (31) is rotatably disposed in the grinding chamber (13) and is connected to the first driving member (33) in a transmission manner. The grinding block (32) is connected to the lower side of the grinding disc (31).

2. The graphite grinding apparatus according to claim 1, characterized in that, The grinding block (32) has a first curved surface (321) located on the radially outer side of the grinding disc (31).

3. The graphite grinding apparatus according to claim 2, characterized in that, The grinding block (32) is an elliptical cylinder with a major axis length L1 of 60mm-100mm, a minor axis length L2 of 30mm-50mm, and a height L3 of 30mm-60mm.

4. The graphite grinding apparatus according to claim 1, characterized in that, The grinding blocks (32) are multiple, and the multiple grinding blocks (32) are arranged at intervals on the lower side of the grinding disk (31) around the rotation axis of the grinding disk (31).

5. The graphite grinding apparatus according to claim 1, characterized in that, The grinding chamber (13) includes a plurality of grinding teeth (131), which are arranged at intervals on the inner wall of the grinding chamber (13).

6. The graphite grinding apparatus according to claim 1, characterized in that, The distance L4 between the bottom surface of the grinding chamber (13) and the top surface of the outer shell (1) is 1000mm-1500mm.

7. The graphite grinding apparatus according to claim 1, characterized in that, It also includes a filter (4), which is at least partially disposed on the underside of the impeller (21).

8. The graphite grinding apparatus according to claim 1, characterized in that, The grinding disc mechanism (3) further includes a drive shaft (341), a first drive wheel (342), a second drive wheel (343), and a transmission component. One end of the drive shaft (341) is connected to the grinding disc (31), and the other end is connected to the first drive wheel (342). The output end of the first drive component (33) is connected to the second drive wheel (343), and the transmission component drives the first drive wheel (342) and the second drive wheel (343).

9. The graphite grinding apparatus according to claim 8, characterized in that, The grinding disc mechanism (3) further includes a connector (351), a cover plate (352), a first bolt (353), and a second bolt (354). The grinding disc (31) has a first connecting hole (311). The connector (351) includes a connecting part (3511) and an abutting part (3512). The connecting part (3511) has a second connecting hole (35111). The drive shaft (341) is connected in the second connecting hole (35111). The connecting part (3511) is disposed in the first connecting hole (311). The first bolt (353) connects the abutting part (3512) and the grinding disc (31). The abutting part (3512) abuts against the upper side of the grinding disc (31). The second bolt (354) connects the cover plate (352) and the drive shaft (341). The cover plate (352) abuts against the upper side of the connecting part (3511).

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