Grinding device
By combining a two-stage grinding system and a return material mechanism, the problem of uneven particle size distribution in traditional grinding devices is solved, achieving efficient and energy-saving powder grinding, improving grinding accuracy and efficiency, and reducing energy consumption and production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANTONG RESHINE NEW MATERIAL TECHNOLOGY CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-30
AI Technical Summary
Traditional grinding equipment produces uneven particle size distribution when processing ternary precursor powders, resulting in a mixture of coarse and fine particles, requiring additional screening, which is inefficient and energy-intensive.
A two-stage grinding system is adopted, including a first grinding mechanism and a second grinding mechanism, which perform coarse grinding and fine grinding respectively. The unqualified materials are separated as needed and re-transported to the corresponding grinding mechanism through the separator and return pipe in the return mechanism, avoiding additional screening steps.
It improves grinding precision and efficiency, shortens processing cycle, reduces energy consumption, reduces production costs, and achieves efficient and energy-saving powder grinding.
Smart Images
Figure CN224423030U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of powder production technology, specifically to grinding equipment. Background Technology
[0002] Ternary precursors (such as nickel-cobalt-manganese hydroxide) are key raw materials for preparing cathode materials for lithium-ion batteries, and their particle size distribution directly affects battery performance. Traditional grinding equipment results in uneven particle size distribution during processing, with coarse and fine particles mixed after grinding, requiring additional sieving, which is inefficient and energy-intensive. Utility Model Content
[0003] To address the shortcomings of the existing technology, it is necessary to provide a grinding device.
[0004] This application discloses a grinding device for grinding powder. The grinding device includes a first grinding mechanism, a second grinding mechanism, and a return mechanism. The first grinding mechanism includes a first grinding chamber and a first grinding section disposed in the first grinding chamber. The first grinding chamber has a first inlet and a first outlet opposite to the first inlet. The first grinding section is configured to coarsely grind the powder in the first grinding chamber. The second grinding mechanism includes a feed hopper, a second grinding chamber, and a second grinding section disposed in the second grinding chamber. The second grinding chamber has a second inlet and a second outlet opposite to the second inlet. The first outlet and the second inlet are respectively connected to the feed hopper, so that the coarsely ground powder is conveyed to the second grinding chamber. The second grinding section is configured to finely grind the powder in the second grinding chamber. The return material mechanism includes a separator and a return material pipe. The separator is connected to the feed hopper, the second grinding chamber and the return material pipe respectively. The return material pipe is also connected to the first grinding chamber. The separator is configured to separate part of the material conveyed by the feed hopper, convey the separated part of the material to the first grinding mechanism and convey the other part of the separated material to the second grinding mechanism.
[0005] This application establishes a two-stage grinding system with a first grinding mechanism and a second grinding mechanism, forming a coarse and fine grinding system. The first grinding mechanism performs preliminary grinding of the powder, while the second grinding mechanism further refines it, effectively improving grinding precision and making the particle size more uniform, reducing the mixing of coarse and fine particles caused by excessive particle size differences. Simultaneously, the separator in the return material mechanism, in conjunction with the inclined return pipe, can separate some materials as needed and transport them back to the first and second grinding mechanisms for further grinding. This prevents unqualified materials from directly entering subsequent processes, achieving precise grinding without additional screening. This not only significantly improves grinding efficiency and shortens the processing cycle but also greatly reduces energy consumption and production costs, providing a reliable technical solution for the efficient and energy-saving grinding of key raw materials for lithium-ion battery cathode materials.
[0006] In some embodiments of this application, the return pipe includes a first branch pipe and a second branch pipe that are connected to each other. The separator is connected to the first branch pipe, and the second branch pipe is connected to the first grinding chamber. The second branch pipe is inclined relative to the first branch pipe.
[0007] In some embodiments of this application, the separator includes a first end, a second end, and a third end, the first end being connected to the feed hopper, the second end being connected to the second grinding mechanism, and the third end being connected to the first branch pipe.
[0008] In some embodiments of this application, a first screw conveyor is provided in a first branch pipe, and a second screw conveyor is provided in a second branch pipe. The first screw conveyor is configured to convey the material transmitted from the separator to the second branch pipe, and the second screw conveyor is configured to convey the material conveyed by the first screw conveyor to the first grinding chamber.
[0009] In some embodiments of this application, the first grinding mechanism further includes a first stirring assembly, which includes a first stirring blade and a first driving member. The first driving member is disposed outside the first grinding chamber, the first stirring blade abuts against the inner wall of the first grinding chamber, and the first driving member is configured to drive the first stirring blade to rotate to grind the material in the first grinding chamber.
[0010] In some embodiments of this application, the second grinding mechanism further includes a second stirring assembly, which includes a second stirring blade and a second driving member. The second driving member is disposed outside the second grinding chamber, and the second stirring blade abuts against the inner wall of the second grinding chamber. The second driving member is configured to drive the second stirring blade to rotate in order to grind the material in the second grinding chamber.
[0011] In some embodiments of this application, the first driving member and the second driving member are motors.
[0012] In some embodiments of this application, a first discharge port is provided with a first filter hole, and a second discharge port is provided with a second filter hole, wherein the diameter of the first filter hole is larger than the diameter of the second filter hole.
[0013] In some embodiments of this application, the feed hopper includes a fourth end and a fifth end disposed opposite to each other. The fourth end is connected to a first discharge port, and the fifth end is connected to a second feed port. The diameter of the feed hopper gradually decreases along the direction from the fourth end to the fifth end.
[0014] In some embodiments of this application, a third filter hole is provided at the fifth end. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of a grinding apparatus according to one embodiment of this application.
[0016] Explanation of key component symbols:
[0017] Grinding device 1, first grinding mechanism 10, second grinding mechanism 20, return material mechanism 30, first grinding chamber 11, first stirring assembly 12, first feed port 111, first discharge port 112, feed hopper 40, first grinding section 70, second grinding section 80, second grinding chamber 21, second stirring assembly 22, second feed port 211, second discharge port 212, separator 31, return material pipe 32, first end 311, second end 312, third end 313, first branch pipe 321, second branch pipe 322, first screw conveyor 50, second screw conveyor 60, first stirring blade 121, first driving component 122, second stirring blade 221, second driving component 222, first filter hole 1120, second filter hole 2120, third filter hole 401, fourth end 402, fifth end 403.
[0018] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0020] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have a component that is centrally located. When a component is considered to be "located" on another component, it can be directly located on the other component or may also have a component that is centrally located.
[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0022] Please see Figure 1 This application discloses a grinding device 1 for grinding powder. The grinding device 1 includes a first grinding mechanism 10, a second grinding mechanism 20, and a return mechanism 30. The first grinding mechanism 10 includes a first grinding chamber 11 and a first grinding section 70 disposed in the first grinding chamber 11. The first grinding chamber 11 is provided with a first inlet 111 and a first outlet 112 disposed opposite to the first inlet 111. The first grinding section 70 is configured to coarsely grind the powder in the first grinding chamber 11. The first grinding section 70 is composed of nano-zirconia microspheres.
[0023] The second grinding mechanism 20 includes a feed hopper 40, a second grinding chamber 21, and a second grinding section 80 disposed in the second grinding chamber 21. The second grinding chamber 21 is provided with a second feed inlet 211 and a second discharge outlet 212 disposed opposite to the second feed inlet 211. The first discharge outlet 112 and the second feed inlet 211 are respectively connected to the feed hopper 40, so that the coarsely ground powder is transported to the second grinding chamber 21. The second grinding section 80 is configured to perform fine grinding on the powder in the second grinding chamber 21. The second grinding section 80 is a high-hardness ceramic grinding ball.
[0024] The return material mechanism 30 includes a separator 31 and a return material pipe 32. The separator 31 is connected to the feed hopper 40, the second grinding chamber 21 and the return material pipe 32 respectively. The return material pipe 32 is also connected to the first grinding chamber 11. The separator 31 is configured to separate part of the material conveyed by the feed hopper 40, convey the separated part of the material to the first grinding mechanism 10, and convey the other part of the separated material to the second grinding mechanism 20.
[0025] This application establishes a two-stage grinding system with a first grinding mechanism 10 and a second grinding mechanism 20, forming a coarse and fine grinding system. The first grinding mechanism 10 performs preliminary grinding of the powder, while the second grinding mechanism 20 further refines it, effectively improving grinding precision and making the particle size more uniform, reducing the mixing of coarse and fine particles caused by excessive particle size differences. Simultaneously, the separator 31 and return pipe 32 in the return material mechanism 30 work together to separate some materials as needed and transport them back to the first and second grinding mechanisms 20 for further grinding. This prevents unqualified materials from directly entering subsequent processes, achieving precise grinding without additional screening. This not only significantly improves grinding efficiency and shortens the processing cycle but also greatly reduces energy consumption and production costs, providing a reliable technical solution for the efficient and energy-saving grinding of key raw materials for lithium-ion battery cathode materials.
[0026] In some embodiments of this application, the return pipe 32 includes a first branch pipe 321 and a second branch pipe 322 connected to each other. The separator 31 is connected to the first branch pipe 321, and the second branch pipe 322 is connected to the first grinding chamber 11. The second branch pipe 322 is inclined relative to the first branch pipe 321. By setting the second branch pipe 322 to be inclined relative to the first branch pipe 321, material backflow can be prevented.
[0027] In some embodiments of this application, the separator 31 includes a first end 311, a second end 312, and a third end 313. The first end 311 is connected to the feed hopper 40 and can directly receive materials from the first grinding mechanism 10 and conveyed by the feed hopper 40, laying the foundation for subsequent diversion. The second end 312 is connected to the second grinding mechanism 20 and can accurately convey materials suitable for fine grinding to the second grinding mechanism 20, ensuring the continuity of the fine grinding process. The third end 313 is connected to the first branch pipe 321, allowing materials that need to be coarsely ground again to smoothly enter the return material mechanism 30. By setting the separator 31, materials can be flexibly and efficiently distributed to suitable grinding mechanisms according to the actual grinding state of the materials. Compared with structures without clear port division of labor, this avoids the chaos and disorder of material conveying, greatly improves the efficiency of material circulation grinding, reduces the residence time of materials during the transmission process, and thus improves the production efficiency of the entire grinding device 1. It also provides structural protection for achieving precise grinding particle size control, ensuring that materials at different grinding stages can be properly processed. Optionally, the separator 31 is a cyclone separator.
[0028] In some embodiments of this application, a first screw conveyor 50 is provided in the first branch pipe 321, and a second screw conveyor 60 is provided in the second branch pipe 322. The first screw conveyor 50 is configured to transport the material from the separator 31 to the second branch pipe 322, and the second screw conveyor 60 is configured to transport the material from the first screw conveyor 50 to the first grinding chamber 11. Compared with traditional gravity conveying or simple pipeline conveying, the screw conveyor can flexibly control the conveying speed and flow rate of the material according to actual production needs by adjusting parameters such as rotation speed, thereby better matching the working rhythm of the first grinding mechanism 10 and the second grinding mechanism 20. This not only improves the recycling efficiency of materials but also effectively avoids grinding quality fluctuations caused by uneven material conveying, helping to maintain the stability of the entire grinding device 1.
[0029] In some embodiments of this application, the first grinding mechanism 10 further includes a first stirring assembly 12. The first stirring assembly 12 includes a first stirring blade 121 and a first driving member 122. The first driving member 122 is disposed outside the first grinding chamber 11, and the first stirring blade 121 abuts against the inner wall of the first grinding chamber 11. The first driving member 122 is configured to drive the first stirring blade 121 to rotate to grind the material in the first grinding chamber 11. The design of the first stirring blade 121 abutting against the inner wall of the first grinding chamber 11 allows the stirring blade to fully utilize the space of the grinding chamber during rotation, performing all-round, dead-angle-free stirring and grinding of the material. During the grinding process, the first stirring blade 121 can continuously push the material against the inner wall of the grinding chamber, utilizing the shear force between the inner wall and the stirring blade, as well as the stirring action of the stirring blade itself, to gradually break down and refine large pieces of material.
[0030] In some embodiments of this application, the second grinding mechanism 20 further includes a second stirring assembly 22, which includes a second stirring blade 221 and a second driving member 222. The second driving member 222 is disposed outside the second grinding chamber 21, and the second stirring blade 221 abuts against the inner wall of the second grinding chamber 21. The second driving member 222 is configured to drive the second stirring blade 221 to rotate in order to grind the material in the second grinding chamber 21. By finely grinding the material that has undergone preliminary processing by the first grinding mechanism 10, the situation of insufficient or excessive grinding in some areas is avoided, thereby improving the quality and consistency of fine grinding and providing a reliable guarantee for the production of high-quality ternary precursors.
[0031] In some embodiments of this application, the first driving member 122 and the second driving member 222 are motors.
[0032] In some embodiments of this application, the first discharge port 112 is provided with a first filter hole 1120, and the second discharge port 212 is provided with a second filter hole 2120. The diameter of the first filter hole 1120 is larger than that of the second filter hole 2120. The first filter hole 1120 of the first discharge port 112 can perform preliminary screening of the material after the first grinding mechanism 10 has completed coarse grinding. The second filter hole 2120 of the second discharge port 212 performs final screening of the material after the second grinding mechanism 20 has performed fine grinding. Only the material whose particle size meets the requirements of the finished product can be discharged through the second filter hole 2120, effectively ensuring the uniformity and consistency of the particle size of the finished product. By setting up graded filtration, the particle size of the material can be controlled more precisely, avoiding the outflow of unqualified material, reducing the rework process due to unqualified particle size, improving the product qualification rate, and also helping to maintain the stability and orderliness of the material flow inside the grinding device 1, optimizing the entire grinding process, and reducing production costs and resource waste.
[0033] In some embodiments of this application, the feed hopper 40 includes a fourth end 402 and a fifth end 403 disposed opposite to each other. The fourth end 402 is connected to the first discharge port 112, and the fifth end 403 is connected to the second feed port 211. The diameter of the feed hopper 40 gradually decreases along the direction from the fourth end 402 to the fifth end 403.
[0034] In some embodiments of this application, the fifth end 403 is provided with a third filter hole 401. The diameter of the third filter hole 401 is smaller than that of the first filter hole 1120 and larger than that of the second filter hole 2120. The third filter hole 401 can perform secondary screening of the material, intercepting materials with larger particle sizes that may have been missed during the screening process at the first discharge port 112 and the first filter hole 1120, thus preventing these insufficiently coarsely ground materials from entering the second grinding mechanism 20. Simultaneously, the insufficiently ground material is returned to the first grinding mechanism 10 via the cyclone separator 31. This optimizes the entire grinding process and improves the grinding device 1's ability to produce high-quality ternary precursors.
[0035] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and substance of the technical solutions of this application.
Claims
1. A grinding apparatus for grinding powder, characterized in that, The grinding apparatus includes: A first grinding mechanism, the first grinding mechanism includes a first grinding chamber and a first grinding part disposed in the first grinding chamber, the first grinding chamber is provided with a first inlet and a first outlet disposed opposite to the first inlet, and the first grinding part is configured to coarsely grind the powder in the first grinding chamber. The second grinding mechanism includes a feed hopper, a second grinding chamber, and a second grinding section disposed in the second grinding chamber. The second grinding chamber is provided with a second feed inlet and a second discharge outlet disposed opposite to the second feed inlet. The first discharge outlet and the second feed inlet are respectively connected to the feed hopper, so that the coarsely ground powder is conveyed to the second grinding chamber. The second grinding section is configured to perform fine grinding on the powder in the second grinding chamber. The material return mechanism includes a separator and a material return pipe. The separator is connected to the feed hopper, the second grinding chamber and the material return pipe respectively. The material return pipe is also connected to the first grinding chamber. The separator is configured to separate a portion of the material conveyed by the feed hopper, convey the separated portion of the material to the first grinding mechanism and convey the other portion of the separated material to the second grinding mechanism.
2. The grinding apparatus according to claim 1, characterized in that, The return pipe includes a first branch pipe and a second branch pipe that are connected to each other. The separator is connected to the first branch pipe, and the second branch pipe is connected to the first grinding chamber. The second branch pipe is inclined relative to the first branch pipe.
3. The grinding apparatus according to claim 2, characterized in that, The separator includes a first end, a second end, and a third end. The first end is connected to the feed hopper, the second end is connected to the second grinding mechanism, and the third end is connected to the first branch pipe.
4. The grinding apparatus according to claim 2, characterized in that, The first branch pipe is equipped with a first screw conveyor, and the second branch pipe is equipped with a second screw conveyor. The first screw conveyor is configured to transport the material from the separator to the second branch pipe, and the second screw conveyor is configured to transport the material from the first screw conveyor to the first grinding chamber.
5. The grinding apparatus according to claim 1, characterized in that, The first grinding mechanism further includes a first stirring assembly, which includes a first stirring blade and a first driving member. The first driving member is disposed outside the first grinding chamber, and the first stirring blade abuts against the inner wall of the first grinding chamber. The first driving member is configured to drive the first stirring blade to rotate in order to grind the material in the first grinding chamber.
6. The grinding apparatus according to claim 5, characterized in that, The second grinding mechanism further includes a second stirring assembly, which includes a second stirring blade and a second driving member. The second driving member is disposed outside the second grinding chamber, and the second stirring blade abuts against the inner wall of the second grinding chamber. The second driving member is configured to drive the second stirring blade to rotate in order to grind the material in the second grinding chamber.
7. The grinding apparatus according to claim 6, characterized in that, The first driving component and the second driving component are motors.
8. The grinding apparatus according to claim 1, characterized in that, The first discharge port is provided with a first filter hole, and the second discharge port is provided with a second filter hole. The diameter of the first filter hole is larger than the diameter of the second filter hole.
9. The grinding apparatus according to claim 1, characterized in that, The feed hopper includes a fourth end and a fifth end that are arranged opposite to each other. The fourth end is connected to the first discharge port, and the fifth end is connected to the second feed port. The diameter of the feed hopper gradually decreases along the direction from the fourth end to the fifth end.
10. The grinding apparatus according to claim 9, characterized in that, The fifth end is provided with a third filter hole.