Internal circulation grinding device for lithium battery material

Abstract

The invention discloses an internal circulation grinding device for a lithium battery material. The internal circulation grinding device comprises a machine body, a grinding disc, a grinding ring, a rotary driving mechanism, a guide barrel, a main shaft, a grader and a feeding pipeline, a hollow cavity is formed in the machine body; the grinding disc and the grinding ring are rotationally arranged in the cavity, and the material guide barrel is arranged in the cavity and located above the grinding disc; the diameter of the upper end of the guide cylinder is greater than that of the classifier inlet; the upper end of the material guide cylinder upwards extends to the horizontal position of the inlet of the grader; the rotary driving mechanism is arranged on the lower side of the machine body, and the output end of the rotary driving mechanism is connected with the spindle; air inlet fan blades are arranged on the periphery of the bottom surface of the grinding disc, and the air inlet fan blades generate air flow upwards flowing to a gap between the grinding disc and the grinding ring along the conical surface of the cone structure along with rotation of the grinding disc; and a guide plate for guiding powder into the grader is arranged at the top of the cavity and around the inlet of the grader. The grinding device has the advantages of smooth flow guide, high grinding efficiency and good grinding effect.

Description

Technical Field

[0001] The invention relates to a powder grinder, in particular to an internal circulation grinding device for lithium battery materials with smooth flow guidance, high grinding efficiency and good grinding effect. Background Art

[0002] With the development of new energy, people's demand for lithium batteries is becoming more and more vigorous, and the quality requirements for lithium batteries are getting higher and higher. Therefore, in the process of producing lithium batteries, the production process of lithium battery materials is particularly important. The grinding of lithium battery materials is an important part of it. The existing lithium battery material grinding process is: the driving motor drives the grinding disc and the grinding head to rotate at high speed, and the lithium battery material enters from the feed port and is ground into smaller particles through the gap between the grinding head and the grinding circle. Finally, the lithium battery material powder is exported through the classifier, and the larger particles are returned to the grinding disc through the guide barrel for further grinding. However, the height and diameter of the traditional guide barrel are relatively small. The mixed airflow of particles flowing upward from the gap between the grinding disc and the grinding circle may flow out of the guide barrel after rising to the classifier, and then be blown upward by the airflow in the gap again, so it cannot re-enter the grinding disc for grinding. The flow is not smooth enough, and it is difficult to form a stable circulating airflow to circulate the particles, resulting in insufficient grinding efficiency and unsatisfactory grinding effect. Summary of the invention

[0003] The object of the present invention is to provide a lithium battery material internal circulation grinding device with smooth flow conduction, high grinding efficiency and good grinding effect.

[0004] In order to achieve the above-mentioned purpose, the lithium battery material internal circulation grinding device provided by the present invention comprises a machine body, a grinding disc, a grinding ring, a rotary drive mechanism, a material guide cylinder, a main shaft, a classifier and a feed pipe; a hollow cavity is provided in the machine body, an air inlet is provided at the lower end of the cavity, and a discharge port is provided at the upper end; the feed pipe is arranged on the outside of the machine body and extends into the material guide cylinder; the grinding disc and the grinding ring are arranged in the cavity, the material guide cylinder is arranged inside the cavity and located above the grinding disc; the classifier is arranged at the discharge port and located above the material guide cylinder; the diameter of the upper end of the material guide cylinder is larger than that of the The diameter of the classifier inlet; the upper end of the guide cylinder extends upward to the horizontal position of the classifier inlet; the grinding disc is connected to the main shaft, the rotation drive mechanism is arranged on the lower side of the body and the output end is connected to the main shaft to drive the main shaft to rotate; the bottom surface of the cavity is a cone structure, and the bottom surface of the grinding disc is surrounded by air intake blades, and the air intake blades generate an airflow along the cone surface of the cone structure and flow upward to the gap between the grinding disc and the grinding ring as the grinding disc rotates; the top of the cavity is located around the inlet of the classifier and is provided with guide plates for guiding powder to enter the classifier.

[0005] Compared with the prior art, the present invention uses the main shaft to drive the grinding disc to rotate, so that the grinding disc and the grinding ring rotate relative to each other to achieve the purpose of grinding lithium battery materials; and by setting a guide barrel, the guide barrel is extended to the horizontal position of the inlet of the classifier, and the diameter is increased to be larger than the diameter of the classifier and smaller than the diameter of the cavity, so that an air outlet is formed between the edge of the guide barrel and the inner wall of the cavity. When the particle mixed airflow is blown out from the air outlet, it can directly and quickly reach the inlet of the classifier and be sorted, and the larger particles will fall and re-enter the guide barrel after being filtered out by the classifier, avoiding falling on the gap between the grinding disc and the grinding ring. In this way, the airflow of the entire cavity truly forms a circulating airflow with the outer periphery of the guide barrel upward and the middle part of the guide barrel downward, ensuring that the larger particles can flow back to the grinding disc every time, and the flow is very smooth, so as to continuously circulate and grind, greatly improving the grinding efficiency and grinding effect.

[0006] Preferably, the top of the cavity is located around the inlet of the classifier and is provided with guide plates for guiding the powder to enter the classifier, so that the powder can flow more smoothly and the circulating airflow in the cavity can be more stable.

[0007] Preferably, the grinding disc is rotatably disposed in the cavity, the grinding ring is fixed to the inner wall of the cavity and located at the outer periphery of the grinding disc, and a first grinding head is fixedly provided around the surface of the grinding disc, and the first grinding head is opposite to the inner wall of the grinding ring.

[0008] Specifically, the upper end of the first grinding head is fixedly connected with a second grinding head, and the second grinding head is located above the gap between the first grinding head and the grinding ring and is set with a gap between the upper side wall of the grinding ring and the inner side wall of the cavity. In this way, by utilizing the rotational driving force of the main shaft to simultaneously drive the second grinding head to rotate relative to the grinding ring, the powder flowing upward from the gap between the grinding disc and the grinding ring can be ground, thereby further improving the grinding efficiency and grinding quality.

[0009] Specifically, an extending direction of a gap between the second grinding head and an upper side wall of the grinding ring is perpendicular to an extending direction of a gap between the first grinding head and an inner side of the grinding ring.

[0010] Preferably, the lithium battery material internal circulation grinding device also includes a first fan blade, which is arranged in the material guide barrel and connected to the main shaft. The first fan blade rotates and breaks up the lithium battery material and makes the air flow in the material guide barrel flow from top to bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural diagram of the internal circulation grinding device for lithium battery materials of the present invention.

[0012] Figure 2 It is a structural diagram of the grinding disc of the lithium battery material internal circulation grinding device of the present invention installed in the cavity.

[0013] Figure 3 It is a structural diagram of the grinding disc of the lithium battery material internal circulation grinding device of the present invention.

[0014] Figure 4 It is a flow diagram of powder during grinding in the internal circulation grinding device for lithium battery materials of the present invention. DETAILED DESCRIPTION

[0015] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0016] like Figure 1 and Figure 2As shown, the lithium battery material internal circulation grinding device 100 of the present invention includes a body 1, a grinding disc 2, a grinding ring 3, a rotary drive mechanism 4, a material guide barrel 5, a main shaft 6, a first fan blade 7, a classifier 8 and a feed pipe 9. The body 1 is a cylindrical structure, and a hollow cavity 11 is provided in the body 1. The lower end of the cavity 11 is provided with an air inlet 12, and the upper end is provided with a discharge port 13. The upper end of the material guide barrel 5 is a cylindrical structure, and the lower end is an inverted cone structure, and the upper and lower ends of the material guide barrel 5 are both open. The feed pipe 9 is arranged on the outside of the body 1 and extends into the material guide barrel 5, so that the lithium battery material is discharged from the feed pipe 9 to the material guide barrel 5. The grinding disc 2 is rotatably arranged in the cavity 11, and the grinding ring 3 is fixed to the inner wall of the cavity 11 and is located on the outer periphery of the grinding disc 2. The grinding disc 2 and the grinding ring 3 are concentrically arranged. The material guide barrel 5 is arranged inside the cavity 11 and is located above the grinding disc 2. The classifier 8 is arranged at the discharge port 13 and is located directly above the material guide barrel 5. The grinding disc 2 is connected to the main shaft 6, and the main shaft 6 is coaxially arranged with the central axis of the machine body 1. The main shaft 6 extends into the material guide barrel 5 through the air inlet 12. The first fan blade 7 is arranged in the material guide barrel 5 and is connected to the main shaft 6. The rotary drive mechanism 4 is arranged on the lower side of the machine body 1 and the output end is connected to the main shaft 6 to drive the main shaft 6 to rotate, so that the first fan blade 7 rotates and breaks up the lithium battery material and the grinding disc 2 rotates and grinds the lithium battery material. The rotary drive mechanism 4 is a motor. The main shaft 6 is used to drive the grinding disc 2 to rotate, so that the grinding disc 2 and the grinding circle 3 rotate relative to each other, thereby achieving the purpose of grinding the lithium battery material; and by arranging a first fan blade 7 in the guide barrel 5, and connecting the first fan blade 7 to the main shaft 6, the main shaft 6 is used to simultaneously drive the first fan blade 7 to rotate, so that the first fan blade 7 can be used to break up the agglomerated lithium battery material before the lithium battery material enters the grinding disc 2, thereby making the volume of the lithium battery material in the grinding disc 2 smaller, thereby preventing the agglomerated material from accumulating on the grinding disc 2 and being unable to enter the gap between the grinding disc 2 and the grinding circle 3, ensuring that the lithium battery material in the cavity 11 flows smoothly to the gap between the grinding disc 2 and the grinding circle 3 during grinding, thereby improving the grinding efficiency, and fine grinding is performed on the premise of pre-grinding by the first fan blade 7, so that the grinding effect is better.

[0017] See also Figure 1 and Figure 2, the lithium battery material internal circulation grinding device 100 also includes a second blade 10, which is connected to the main shaft 6 and is located below the first blade 7. The first blade 7 and the second blade 10 are arranged in the same direction to drive the lithium battery material and the airflow in the cavity 11 to flow from the top to the grinding disc 2 downward. The blades of the second blade 10 are staggered with the blades of the first blade 7. By setting the second blade 10, the second blade 10 can cooperate with the first blade 7 to break up the agglomerated material more quickly, which is beneficial to improve the feeding speed and grinding effect. In addition, a filter screen 110 is provided in the material guide barrel 5, and the filter screen 110 is located below the second blade 10. By setting the filter screen 110, it is possible to effectively prevent large pieces of agglomerated materials from falling onto the grinding disc 2 and causing accumulation, and to allow the agglomerated materials to remain near the first blade 7 and the second blade 10 and be continuously broken up by the first blade 7 and the second blade 10, thereby ensuring that the volume of the material falling onto the grinding disc 2 is small, which is conducive to its entering the gap 2a between the grinding disc 2 and the grinding circle 3, further improving the grinding effect.

[0018] Please see again Figure 1 and Figure 2 , the diameter of the upper end of the guide barrel 5 is larger than the diameter of the inlet of the classifier 8. The inlet of the classifier 8 of the present application is located on the outer peripheral side wall, and the diameter of the guide barrel 5 is larger than the circumferential diameter of the outer periphery of the classifier. The upper end of the guide barrel 5 extends upward to the horizontal position of the inlet of the classifier 8. In this way, the large particle materials filtered out by the classifier 8 can be effectively received, so that the large particle materials can re-enter the grinding disc 2 for grinding. In addition, the top of the cavity 11 is located around the inlet of the classifier 8 and is provided with a guide plate 14 for guiding the powder to enter the classifier 8. The guide plate 14 is arranged to be inclined downward from one end close to the classifier 8 to one end close to the inner side wall of the cavity 11. The entire guide plate 14 is a cone-shaped structure. The provision of the guide plate 14 can make the powder flow smoother and make the circulating airflow in the cavity 11 more stable.

[0019] See also Figure 1 and Figure 2The bottom surface of the cavity 11 is a cone structure, and the cone surface 15 extends from the downwardly inclined inner wall of the cavity 11 to the middle part. The bottom surface of the grinding disc 2 is evenly provided with air intake blades 120 around the central axis. The air intake blades 120 generate an airflow that flows upward toward the gap 2a between the grinding disc 2 and the grinding ring 3 along the cone surface 15 of the cone structure as the grinding disc 2 rotates. By providing the air intake blades 120, the air intake blades 120 are used to generate an airflow blowing toward the gap 2a, which can prevent the powder in the gap 2a from flowing downward to the air inlet 12, and can also generate an airflow blowing upward at the gap 2a, so that it is easier to form a stable circulating airflow in the cavity 11, which is conducive to improving the grinding efficiency.

[0020] See also Figure 2 and Figure 3 The surface of the grinding disc 2 is fixedly provided with a first grinding head 21 around the periphery, and the first grinding head 21 is opposite to the inner side wall of the grinding ring 3. The upper end of the first grinding head 21 is fixedly connected with a second grinding head 22, and the second grinding head 22 is located above the gap 2a between the first grinding head 21 and the grinding ring 3 and is provided with a gap 2b with the upper side wall of the grinding ring 3 and the inner side wall of the cavity 11. In this way, by utilizing the rotational driving force of the spindle 6 to simultaneously drive the second grinding head 22 to rotate relative to the grinding ring 3, the powder flowing upward from the gap 2a between the grinding disc 2 and the grinding ring 3 can be ground, thereby further improving the grinding efficiency and grinding quality. The extension direction of the gap 2b between the second grinding head 22 and the upper side wall of the grinding ring 3 is perpendicular to the extension direction of the gap 2a between the first grinding head 21 and the inner side of the grinding ring 3.

[0021] Combining the above and Figure 4 , the working principle of the present invention is described in detail below, as follows:

[0022] During grinding, the rotary drive mechanism 4 is first started to drive the grinding disc 2, the first blade 7 and the second blade 10 to rotate through the main shaft 6. At the same time, the classifier 8 is started to generate negative pressure at the inlet. At this time, the airflow is blown upward from the gap 2a between the grinding disc 2 and the inner wall of the cavity 11, and flows upward to the inlet of the classifier 8 under the negative pressure of the classifier 8, while the first blade 7 and the second blade 10 generate an airflow from top to bottom in the guide barrel 5, and the airflow on the grinding disc 2 flows from the middle to the periphery under the action of centrifugal force. Therefore, a circulating airflow from the periphery to the middle and downward is formed inside the cavity 11. At this time, the lithium battery material is transported to the guide barrel 5 through the feed pipe 9. After the lithium battery material is broken by the first blade 7 and the second blade 10, and then screened by the filter screen 110, the lithium battery material with a smaller volume falls to the center of the grinding disc 2. Afterwards, the centrifugal force generated by the rotation of the grinding disc 2 is thrown outward. When the lithium battery material is thrown onto the grinding circle 3, the grinding disc 2 drives the first grinding head 21 to rotate, and the lithium battery material is ground in the gap 2a between the first grinding head 21 and the grinding circle 3. Afterwards, the lithium battery material is ground again in the gap 2b between the second grinding head 22 and the upper side wall of the grinding circle 3; then, the ground powder and the granular mixed material are blown upward from the gap 2b between the front end of the second grinding head 22 and the inner side wall of the cavity 11, and flow upward to the classifier 8 driven by the air flow. The powder of the size is sucked away by the classifier 8 and discharged from the discharge port 13 and collected. The larger particles are blocked by the classifier 8 and fall down. After falling, the larger particles just enter the guide barrel 5. Under the guidance of the air flow in the guide barrel 5, they are polished by the first blade 7 and the second blade 10 again and return to the grinding disc 2 for cyclic grinding until the powder of the size is formed and sucked away.

[0023] Compared with the prior art, the present invention drives the grinding disc 3 to rotate by using the main shaft 6, so that the grinding disc 2 and the grinding ring 3 rotate relative to each other, thereby achieving the purpose of grinding the lithium battery material; and by setting the guide barrel 5, the guide barrel 5 is extended to the horizontal position of the inlet of the classifier 8, and its diameter is increased to be larger than the diameter of the classifier 8 and smaller than the diameter of the cavity 11, so that an air port 5a is formed between the edge of the guide barrel 5 and the inner wall of the cavity 11, and a guide plate 14 is set on the top of the cavity 11. Therefore, when the particle mixed airflow is blown out from the air port, it can directly and quickly reach the inlet of the classifier 8 and be sorted, and the larger particles will fall and re-enter the guide barrel 5 after being filtered out by the classifier, avoiding falling on the gap 2a between the grinding disc 2 and the grinding ring 3. At the same time, driven by the first fan blade 7 and the air intake fan blade 10, the air flow in the material guide barrel 5 can flow from top to bottom, while the external air flow flows from bottom to top. Therefore, the air flow in the entire cavity 11 truly forms a circulating airflow in which the air flows upward at the periphery of the material guide barrel 5 and downward in the middle of the material guide barrel 5, ensuring that larger particles can flow back to the grinding disc 2 each time, and then continue to circulate and grind, greatly improving the grinding efficiency and grinding effect.

[0024] The structure of the classifier 8 involved in the lithium battery material internal circulation grinding device 100 of the present invention is well known to ordinary technicians in the field and will not be described in detail here.

[0025] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A lithium battery material internal circulation grinding device, characterized in that: The invention comprises a machine body, a grinding disc, a grinding ring, a rotary drive mechanism, a material guide cylinder, a main shaft, a classifier and a feed pipe; a hollow cavity is arranged in the machine body, an air inlet is arranged at the lower end of the cavity, and a discharge port is arranged at the upper end; the feed pipe is arranged on the outside of the machine body and extends into the material guide cylinder; the grinding disc and the grinding ring are arranged in the cavity, the material guide cylinder is arranged inside the cavity and located above the grinding disc; the classifier is arranged at the discharge port and located above the material guide cylinder; the upper end of the material guide cylinder The diameter of the material guide cylinder is larger than the diameter of the inlet of the classifier; the upper end of the material guide cylinder extends upward to the horizontal position of the inlet of the classifier; the grinding disc is connected to the main shaft, and the rotary drive mechanism is arranged on the lower side of the machine body and the output end is connected to the main shaft to drive the main shaft to rotate; the bottom surface of the cavity is a cone structure, and the bottom surface of the grinding disc is surrounded by air intake blades, and the air intake blades generate an airflow along the cone surface of the cone structure and flow upward to the gap between the grinding disc and the grinding ring as the grinding disc rotates.

2. The lithium battery material internal circulation grinding device according to claim 1, characterized in that: The top of the cavity is located around the inlet of the classifier and is provided with guide plates for guiding powder to enter the classifier.

3. The lithium battery material internal circulation grinding device according to claim 1, characterized in that: The grinding disc is rotatably disposed in the cavity, the grinding ring is fixed to the inner wall of the cavity and located at the outer periphery of the grinding disc, and a first grinding head is fixedly disposed around the surface of the grinding disc, and the first grinding head is opposite to the inner side wall of the grinding ring.

4. The lithium battery material internal circulation grinding device according to claim 3, characterized in that: The upper end of the first grinding head is fixedly connected with a second grinding head. The second grinding head is located above the gap between the first grinding head and the grinding ring and is arranged with a gap between the upper side wall of the grinding ring and the inner side wall of the cavity.

5. The lithium battery material internal circulation grinding device according to claim 4, characterized in that: An extending direction of a gap between the second grinding head and the upper side wall of the grinding ring is perpendicular to an extending direction of a gap between the first grinding head and the inner side of the grinding ring.

6. The lithium battery material internal circulation grinding device according to claim 1, characterized in that: The lithium battery material internal circulation grinding device also includes a first fan blade, which is arranged in the material guide barrel and connected to the main shaft. The first fan blade rotates and breaks up the lithium battery material and makes the air flow in the material guide barrel flow from top to bottom.

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