Dispersing, homogenizing and grinding equipment applied to fine grinding stage of positive electrode material of lithium battery

Abstract

The invention discloses dispersing, homogenizing and grinding equipment applied to a fine grinding stage of a lithium battery positive electrode material, and relates to the technical field of lithium battery positive electrode material grinding, the dispersing, homogenizing and grinding equipment comprises a uniform grinding cylinder, a first grinding layer and a second grinding layer are fixed in the uniform grinding cylinder from top to bottom, and a buffer grinding cylinder is uniformly mounted between the first grinding layer and the second grinding layer; the first grinding layer, the buffering homogenizing cylinder and the second grinding layer are integrated in the same homogenizing cylinder, the whole-process integrated continuous operation of feeding, coarse grinding, buffering, accurate grinding and discharging is achieved, the device is located between the two stages of grinding layers, strong shearing secondary fine grinding and material temporary storage are achieved through rotation of a conical column, the upper-stage material flow and the lower-stage material flow are automatically coordinated, it is guaranteed that the process is smooth, and the working efficiency is improved. And the single pivoting column synchronously drives all the grinding conical rollers and the buffer mechanism through the bevel gear set, the caking column is driven by the air cylinder, the axial displacement of the grinding conical rollers is converted into opening and closing of the sealing baffle through mechanical linkage of the conical block, the external expansion block and the arc cover, and automatic discharging after grinding reaches the standard is achieved.

Description

Technical Field

[0001] This invention relates to the field of lithium battery cathode material grinding technology, specifically to a dispersion and homogenization grinding device applied in the fine grinding stage of lithium battery cathode materials. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the performance requirements of power batteries are increasing day by day. The processing quality of the core lithium battery cathode materials (such as lithium iron phosphate, ternary materials, etc.) directly determines the energy density, cycle life and safety of the battery. In the cathode material preparation process, fine grinding and homogeneous dispersion of the precursor or sintered material is a crucial step, aiming to obtain micron- or even submicron-sized slurry with uniform particle size distribution, good dispersion and no hard agglomeration, so as to ensure the consistency of subsequent coating process and the electrochemical performance of battery electrode sheets.

[0003] Currently, the industry uses air jet mills as a representative for fine grinding and dispersion of lithium battery cathode materials. These mills use high-speed airflow to cause material particles to collide and rub against each other to achieve pulverization, or wet grinding is carried out using sand mills, ball mills, or high-speed dispersers. To improve the overall uniformity of grinding, a multi-stage grinding design approach has emerged. For example, the patent with publication number CN121178280A proposes a three-stage connection scheme of "pretreatment, coarse grinding, and fine grinding". It improves efficiency by dynamically adjusting the grinding gap. Although it focuses on particle size gradient treatment, the relationship between each stage is mostly a simple series relationship, lacking effective buffering and flow matching design. When the grinding efficiency of the upper and lower stages is not matched, it is easy to cause material blockage or idling, affecting the stability and energy efficiency of continuous production. In addition, the drive and control of this system is usually quite complex, requiring multiple power sources or independent temperature control and pressure regulation systems, which increases the complexity of the equipment and maintenance costs.

[0004] Therefore, we propose a dispersion and homogenization grinding device for use in the fine grinding stage of lithium battery cathode materials. Summary of the Invention

[0005] The purpose of this invention is to provide a dispersion and homogenization grinding device for use in the fine grinding stage of lithium battery cathode materials, thereby solving the problems mentioned in the background art;

[0006] To achieve the above objectives, the present invention provides the following technical solution: a dispersion and homogenization grinding device applied in the fine grinding stage of lithium battery cathode materials, comprising a homogenization grinding cylinder, wherein a grinding layer one and a grinding layer two are fixed from top to bottom inside the homogenization grinding cylinder, and a buffer grinding cylinder is uniformly installed between the two.

[0007] Grinding chamber 1 is uniformly formed on grinding layer 1, grinding chamber 2 is uniformly formed on grinding layer 2, a conical roller 1 is movably connected in grinding chamber 1, and a material winding blade is also installed in grinding chamber 1. Conical roller 2 is movably connected in grinding chamber 2, and a material winding blade is also installed in grinding roller 2.

[0008] The bottom of the grinding cylinder is movably connected to a central rotating column, which penetrates the first grinding layer and the second grinding layer and is movably connected to the inner wall of the top of the grinding cylinder through a bearing. A bevel gear is sleeved on the outer wall of the central rotating column and located inside the first and second grinding layers. Conical rollers one and two, which are installed in the first and second grinding chambers respectively, penetrate one side of the inner wall and are sleeved with bevel gears. The bevel gears installed at the ends of conical rollers one and two mesh with the bevel spur gears on the central rotating column, and drive multiple sets of conical rollers one and two to rotate through the rotation of the central rotating column.

[0009] Furthermore, the conical roller 1 in the first grinding chamber and the conical roller 2 in the second grinding chamber are installed in opposite directions, and the overall length of the conical roller 2 is greater than that of the conical roller 1. The gap between the conical roller 2 and the second grinding chamber is smaller than the gap between the conical roller 1 and the first grinding chamber.

[0010] Furthermore, a rotating sleeve is movably connected inside the buffer grinding cylinder at the bottom of the first grinding layer. The rotating sleeve is hollow and communicates with the second grinding cavity on the second grinding layer. A conical column is fitted inside the rotating sleeve in the buffer grinding cylinder. Openings are evenly provided on the side wall at the bottom of the conical column. A spur gear is fitted on the side of the central rotating shaft in the buffer grinding cylinder and meshes with a spur gear fitted on the outside of the rotating sleeve in the buffer grinding cylinder. The rotation of the conical column is achieved by rotating the central rotating shaft.

[0011] Furthermore, a cylinder is installed on the grinding cylinder at the top of the grinding layer. One end of the cylinder passes through one side of the grinding cylinder and is connected to the agglomeration column. The agglomeration column is located inside the central rotating column and is equipped with a conical block. The cylinder extends and retracts to drive the agglomeration column to slide up and down.

[0012] Furthermore, a connecting shaft is provided inside the first and second conical rollers. One end of the connecting shaft passes through the first and second grinding layers and extends to the conical block side of the agglomerated column surface, and an arc cover is welded and fixed on the connecting shaft on this side.

[0013] Furthermore, a slot is opened on the side wall of the central rotating column and on the corresponding arc cover side wall, and an outward expansion block is slidably connected in the slot. One side of the outward expansion block abuts against the arc cover, and the other side of the outward expansion block abuts against the conical block on the block column.

[0014] Furthermore, a sealing discharge sleeve is installed on the grinding layer one and grinding layer two and on the corresponding connecting shaft side. The sealing discharge sleeve is connected to the discharge port on one side of the corresponding grinding chamber one and grinding chamber two. A baffle is slidably connected inside the sealing discharge sleeve. The baffle is used for material discharge control inside the sealing discharge sleeve. The other side of the baffle extends to the corresponding connecting shaft side, and the sliding of the baffle is controlled by a tension spring installed inside the sealing discharge sleeve.

[0015] Furthermore, a material collecting cylinder is fixed inside the grinding cylinder and at the bottom of the second grinding layer on the sealed material feeding sleeve side, for enriching the wet material in the second grinding chamber. A discharge conduit is installed on the side of the material collecting cylinder, and a material control port is opened at the top of the grinding cylinder for dispersing and guiding the wet material into the corresponding first grinding chamber.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention achieves a progressive and continuous process for grinding wet lithium battery cathode materials from coarse to fine grinding by setting a three-stage grinding structure and combining a conical grinding roller with a material roll blade. The conical gap design allows the material to be naturally squeezed and sheared during the process. With the gap control of different levels, the particle size uniformity and dispersion of the material are significantly improved, which is beneficial to improving the electrochemical performance and consistency of the subsequent cathode material.

[0018] 2. This invention adopts a single-axis drive for multiple grinding rollers. The synchronous operation of multiple grinding units is achieved through the linkage of the central rotating column and bevel gear. The structure is compact, the transmission is stable, and the energy consumption is low. Combined with the pneumatic linkage feeding mechanism, the coordinated control of the cylinder, the agglomerating column, the outer expansion block and the baffle realizes the automated timing control of grinding and discharging, avoids the premature discharge of substandard materials, improves the continuity of production and the controllability of the process, is suitable for industrial continuous production, and is easy to maintain and clean. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the dispersion and homogenization grinding equipment used in the fine grinding stage of lithium battery cathode materials according to the present invention.

[0020] Figure 2 This is a schematic diagram of the grinding layer 1 inside the grinding cylinder and the grinding layer installation structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the installation of the buffer grinding cylinder in the middle of the first grinding layer and the second grinding layer of the present invention;

[0022] Figure 4 This is a schematic diagram of the cylinder connection block column structure at the top of the grinding cylinder of the present invention;

[0023] Figure 5 This is a schematic diagram showing the contact between the outer expansion block of the inner wall of the central rotating column and the arc cover at the end of the connecting shaft in this invention;

[0024] Figure 6 This is a schematic diagram of the pivot column in this invention achieving the rotation of the conical column inside the buffer grinding column via gears;

[0025] Figure 7 This is a schematic diagram of the installation structure of the inner baffle of the sealing material feeding sleeve of the present invention.

[0026] In the diagram: 1. Grinding cylinder; 2. Material control port; 3. Grinding layer one; 4. Grinding layer two; 5. Grinding chamber one; 6. Conical roller one; 7. Material winding blade; 8. Connecting shaft; 9. Baffle; 10. Sealed feeding sleeve; 11. Buffer grinding cylinder; 12. Rotating sleeve; 13. Conical column; 14. Through port; 15. Central rotating column; 16. Cylinder; 17. Agglomeration column; 18. Outer expansion block; 19. Arc cover; 20. Material collecting cylinder; 21. Grinding chamber two; 22. Conical roller two; 23. Discharge guide pipe. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-7 The present invention provides a technical solution:

[0029] Example 1: The dispersion and homogenization grinding equipment of the present invention, applied in the fine grinding stage of lithium battery cathode materials, adopts a three-layer progressive grinding structure. Within the homogenization grinding cylinder 1, grinding layer one 3, buffer grinding cylinder 11, and grinding layer two 4 are sequentially arranged from top to bottom to achieve progressive fine grinding, dispersion, and homogenization of the wet lithium battery cathode material. The wet material enters the homogenization grinding cylinder 1 through the top control port 2, and first falls into one side of the grinding chamber one 5 of grinding layer one 3, i.e., the buffer chamber one 4. Figure 3 In the outer part of the grinding chamber 5, a conical roller 6 is provided. A material winding blade 7 is provided on the inner side of the conical roller 6. Due to the structure of the conical roller 6, the wet material poured in from the outside automatically moves inward during the grinding process and enters the working area of ​​the material winding blade 7. The wet material after preliminary grinding is stirred and mixed to achieve preliminary grinding and dispersion. This structure utilizes the change of the conical gap so that the wet material is naturally squeezed and sheared during the pushing process, which improves the efficiency of preliminary grinding and avoids material accumulation and blockage.

[0030] The ground wet material enters the lower buffer grinding cylinder 11 through the discharge port at the bottom of the grinding chamber 5. The buffer grinding cylinder 11 contains a rotating sleeve 12 and a conical column 13. The conical column 13 rotates under the drive of the rotating sleeve 12. The wet material undergoes strong shearing and stirring between the conical column 13 and the inner wall of the buffer grinding cylinder 11, achieving secondary fine grinding and mixing. Figure 4 As shown, the grinding radii of grinding layer 3 and grinding layer 4 are different, and the gaps between the grinding roller and the grinding chamber are different. The grinding rate of the upper part is fast, and the grinding rate of the lower part is slow. The buffer grinding cylinder 11 not only plays a role in temporary storage and buffering, but also coordinates the material flow mismatch caused by the difference in grinding particle size and time between the upper and lower layers, ensuring the continuous and stable operation of the system.

[0031] Subsequently, the wet material falls through the opening 14 on the side wall of the rotating sleeve 12 into the grinding chamber 21 of the second grinding layer 4, corresponding to the attached... Figure 3 Inside the second grinding chamber 21, a second conical roller 22 is provided. The gap between the second roller and the second grinding chamber 21 is smaller than the gap between the first conical roller 6 and the first grinding chamber 5, so as to achieve finer grinding. The second conical roller 22 is also equipped with a material winding blade 7 to realize the mixing of wet material after grinding. By setting different grinding levels with different gaps, the present invention realizes a natural transition from coarse grinding to fine grinding, which significantly improves the particle size consistency and dispersibility of the cathode material.

[0032] After three grinding processes, the wet material finally enters the collecting cylinder 20 through the sealed feeding sleeve 10 and is discharged through the discharge conduit 23, completing the entire fine grinding process. The whole system has a compact structure and a continuous process, making it suitable for industrial continuous production and easy to clean and maintain.

[0033] Example 2: The drive and control mechanism of this equipment is integrated into the linkage system of the central rotating column 15 and the cylinder 16 to realize multi-drive on one shaft and automated feeding control. The central rotating column 15 passes through the grinding cylinder 1 and is driven to rotate by the bottom drive device. The outer wall of the central rotating column 15 is equipped with bevel gears on the inner side of the first grinding layer 3 and the second grinding layer 4, which mesh with the bevel gears at the ends of the first conical roller 6 and the second conical roller 22, respectively. This design realizes the synchronous rotation of multiple grinding rollers driven by a single shaft. The transmission structure is simple, the energy consumption is low, and the synchronization is good, which is conducive to maintaining the process consistency in each grinding chamber.

[0034] To further improve the automation and control precision of the grinding process, a cylinder 16 is installed above the grinding layer 3. The piston rod of the cylinder 16 is connected to the agglomeration column 17, such as... Figure 5 As shown, the agglomerating column 17 is located inside the central rotating column 15, and its surface is provided with a conical block. When the central rotating column 15 rotates, the outer expansion block 18, which is slidably connected in the groove on its surface, rotates along the conical block on the surface of the agglomerating column 17. The conical block of the agglomerating column 17 contacts the outer expansion block 18, pushing the outer expansion block 18 to slide in the groove. The other side of the outer expansion block 18 abuts against the arc cover 19 fixed at the end of the connecting shaft 8, thereby pushing the connecting shaft 8 to move axially. Accompanied by the cylinder 16 pushing the agglomerating column 17 to move downward, the outer radius of the conical block increases, continuously squeezing the outer expansion block 18. The outer expansion block 18 contacts the arc cover 19, and finally realizes the control of the connecting shaft 8 inside the conical roller 16 and the conical roller 22, pushing outward.

[0035] The connecting shaft 8 passes through the first conical roller 6 and the second conical roller 22. Its axial movement can drive the baffle 9 inside the sealed feeding sleeve 10 to slide, controlling the opening and closing of the discharge ports of the first grinding chamber 5 and the second grinding chamber 21. Figure 7 and Figure 2 As the connecting shaft 8 moves outward to contact the upper baffle 9 of the sealing feeding sleeve 10, the baffle 9 moves outward to open the bottom outlet of the sealing feeding sleeve 10, and the wet material is automatically discharged. This pneumatic-mechanical linkage feeding mechanism realizes the timing control of grinding and feeding, avoids the premature discharge of substandard materials, and improves the product particle size qualification rate. When the wet material is not ground to the standard, the cylinder 16 retracts, and the baffle 9 closes the discharge port under the action of the tension spring, and continues the next round of grinding. The wet material that has been ground in the second grinding layer 4 finally enters the collecting cylinder 20 for enrichment and is discharged uniformly from the bottom connected material guide tube 23.

[0036] In addition, the rotating sleeve 12 inside the buffer grinding cylinder 11 is linked with the central rotating column 15 through gears to realize the rotation of the conical column 13, which further enhances the mixing and fine grinding effect of wet materials. The whole system integrates grinding, buffering and control, with a compact structure, sensitive response and precise control, and is suitable for wet grinding process of lithium battery cathode materials with high consistency requirements.

[0037] In terms of material grinding process, this equipment adopts a systematic design of "three-stage grinding, one-shaft drive, and pneumatic linkage feeding" to achieve continuous, efficient and homogeneous fine grinding of wet lithium battery cathode materials.

[0038] The positive electrode wet material enters the grinding cylinder 1 through the top control port 2 and first falls into the grinding chamber 5 of the grinding layer 3. During the rotation of the conical roller 6, with the help of its conical structure and the surface material roll blades 7, the material automatically moves from the outside to the inside, and achieves preliminary shearing and dispersion in the gradually narrowing gap.

[0039] After initial grinding, the material enters the buffer grinding cylinder 11. The conical column 13 inside the cylinder rotates with the rotating sleeve 12 to perform secondary stirring and fine grinding on the material. At the same time, it plays a role in temporary storage and buffering, coordinating the inconsistent material flow caused by the different grinding rates of the upper and lower layers.

[0040] After being buffered, the material enters the grinding chamber 21 of the second grinding layer 4. The gap between the second conical roller 22 and the grinding chamber is smaller, and fine grinding is carried out. The qualified material finally enters the collecting cylinder 20 through the sealed feeding sleeve 10 and is discharged uniformly through the bottom discharge pipe 23.

[0041] The pneumatic linkage feeding control is used. During the grinding process, the baffle 9 closes the discharge port under the action of the tension spring. After the grinding reaches the standard, the cylinder 16 pushes the agglomeration column 17 to move down. The conical block of the agglomeration column 17 pushes the outward expansion block 18 to slide outward. The outward expansion block 18 contacts the arc cover 19 at the end of the connecting shaft 8, pushing the connecting shaft 8 to move axially. The connecting shaft 8 drives the baffle 9 to slide, opening the discharge port of the sealed feeding sleeve 10 to realize automatic feeding. After feeding is completed, the cylinder 16 resets, the baffle 9 closes under the action of the tension spring, and the system continues the next round of grinding.

[0042] The drive system has a central rotating column 15 running through the entire device. It is powered by a drive device at the bottom or top. The bevel gear on the central rotating column 15 meshes with the bevel gears at the ends of each conical roller to achieve single-axis synchronous drive of all grinding rollers, ensuring that the speed of each grinding unit is consistent and coordinated. The conical column 13 in the buffer grinding cylinder 11 is linked with the central rotating column 15 through a gear set to achieve the rotation stirring function.

[0043] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

[0044] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dispersion and homogenization grinding device used in the fine grinding stage of lithium battery cathode materials, comprising a homogenization grinding cylinder (1), characterized in that, The grinding cylinder (1) has a grinding layer one (3) and a grinding layer two (4) fixed from top to bottom, and a buffer grinding cylinder (11) is evenly installed between the two. Grinding chamber 1 (5) is evenly provided on grinding layer 1 (3), grinding chamber 2 (21) is evenly provided on grinding layer 2 (4), a conical roller 1 (6) is movably connected in grinding chamber 1 (5), and a material roll blade (7) is also installed in grinding chamber 1 (5). A conical roller 2 (22) is movably connected in grinding chamber 2 (21), and a material roll blade (7) is also installed on conical roller 2 (22). The bottom of the grinding cylinder (1) is movably connected to a central rotating column (15), and the central rotating column (15) passes through the first grinding layer (3) and the second grinding layer (4) and is movably connected to the inner wall of the top of the grinding cylinder (1) through a bearing. A bevel gear is sleeved on the outer wall of the central rotating column (15) and located inside the first grinding layer (3) and the second grinding layer (4). The cone rollers 1 (6) and 2 (22) installed in the first grinding chamber (5) and the second grinding chamber (21) respectively pass through one side of the inner wall and are sleeved with bevel gears. The bevel gears installed at the ends of the cone rollers 1 (6) and 2 (22) mesh with the bevel spur gears on the central rotating column (15) and drive multiple sets of cone rollers 1 (6) and 2 (22) to rotate through the rotation of the central rotating column (15).

2. The dispersion and homogenization grinding equipment according to claim 1, applied in the fine grinding stage of lithium battery cathode materials, is characterized in that, The cone roller 1 (6) in the first grinding chamber (5) and the cone roller 2 (22) in the second grinding chamber (21) are installed in opposite directions, and the overall length of the cone roller 2 (22) is greater than that of the cone roller 1 (6). The gap between the cone roller 2 (22) and the second grinding chamber (21) is smaller than the gap between the cone roller 1 (6) and the first grinding chamber (5).

3. The dispersion and homogenization grinding equipment according to claim 2, applied in the fine grinding stage of lithium battery cathode materials, is characterized in that... A rotating sleeve (12) is movably connected inside the buffer grinding cylinder (11) at the bottom of the first grinding layer (3). The rotating sleeve (12) is hollow and is connected to the second grinding cavity (21) on the second grinding layer (4). A conical column (13) is installed inside the buffer grinding cylinder (11) of the rotating sleeve (12). A through-hole (14) is evenly opened on the side wall at the bottom of the rotating sleeve (12) and a spur gear is installed on the side of the buffer grinding cylinder (11) of the central rotating shaft. The spur gear meshes with the spur gear installed on the outside of the rotating sleeve (12) of the buffer grinding cylinder (11). The rotation of the conical column (13) is achieved by rotating the central rotating shaft.

4. The dispersion and homogenization grinding equipment according to claim 3, used in the fine grinding stage of lithium battery cathode materials, characterized in that, A cylinder (16) is installed on the grinding cylinder (1) at the top of the grinding layer (3). One end of the cylinder (16) passes through one side of the grinding cylinder (1) and is connected to the agglomeration column (17). The agglomeration column (17) is located in the central rotating column (15) and has a conical block. The cylinder (16) extends and retracts to drive the agglomeration column (17) to slide up and down.

5. The dispersion and homogenization grinding equipment according to claim 4, used in the fine grinding stage of lithium battery cathode materials, characterized in that, A connecting shaft (8) is provided inside the first (6) and the second (22) of the cone rollers. One end of the connecting shaft (8) passes through the first (3) and the second (4) of the grinding layer and extends to the cone block side of the surface of the agglomerated column (17). An arc cover (19) is welded and fixed on the connecting shaft (8) on this side.

6. The dispersion and homogenization grinding equipment according to claim 5, used in the fine grinding stage of lithium battery cathode materials, is characterized in that, The central rotating column (15) has a slot on its side wall and the corresponding arc cover (19) side wall. An expansion block (18) is slidably connected in the slot. One side of the expansion block (18) abuts against the arc cover (19), and the other side of the expansion block (18) abuts against the conical block on the block column (17).

7. The dispersion and homogenization grinding equipment according to claim 6, used in the fine grinding stage of lithium battery cathode materials, characterized in that, A sealing discharge sleeve (10) is installed on the first grinding layer (3) and the second grinding layer (4) and located on the side of the corresponding connecting shaft (8). The sealing discharge sleeve (10) is connected to the discharge port on one side of the first grinding chamber (5) and the second grinding chamber (21). A baffle (9) is slidably connected inside the sealing discharge sleeve (10). The baffle (9) is used for material discharge control inside the sealing discharge sleeve (10). The other side of the baffle (9) extends to the side of the corresponding connecting shaft (8), and the sliding of the baffle (9) is controlled by a tension spring installed inside the sealing discharge sleeve (10).

8. The dispersion and homogenization grinding equipment according to claim 7, used in the fine grinding stage of lithium battery cathode materials, characterized in that, A collecting cylinder (20) is fixed inside the grinding cylinder (1) and located at the bottom of the grinding layer (4) on the side of the sealed feeding sleeve (10) for collecting wet grinding material in the grinding chamber (21). A discharge conduit (23) is installed on the side of the collecting cylinder (20). A material control port (2) is opened at the top of the grinding cylinder (1) for dispersing and guiding wet material to the corresponding grinding chamber (5).

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