A spherical graphite production system

Abstract

The present invention relates to the field of spherical graphite production, and discloses a spherical graphite production system, which includes a graphite material storage bin. The feeding end of the graphite material storage bin is connected to a coarse crusher. The feeding end of the coarse crusher is connected to a feeder. The feeding end of the feeder is connected to an ultrafine air flow pulverizer. The top feeding end of the ultrafine air flow pulverizer is connected to an air flow classifier. The feeding ends of the air flow classifier are respectively connected to a spherical graphite shaping machine and a pulse dust collector. A classification motor is installed on the air flow classifier. The output shaft of the classification motor penetrates into the inner wall of the air flow classifier and is fixedly connected to a high-speed rotating shaft. The inside of the air flow classifier is connected to a classification wheel through the high-speed rotating shaft. A negative pressure grinding secondary pulverization mechanism connected to the high-speed rotating shaft is arranged inside the classification wheel, which can solve the problem that some small graphite materials that do not meet the predetermined standards hover in the classification wheel, ensure the integrity and sufficiency of the material pulverization in the spherical graphite production, and improve the production efficiency of spherical graphite.

Description

Technical Field

[0001] The present invention relates to the field of spherical graphite production, and specifically to a spherical graphite production system. Background Art

[0002] Spherical graphite is made from high-quality natural flake graphite as raw material, and the surface of the graphite is modified by advanced processing technology to produce graphite products of different fineness, in the shape of an elliptical sphere. Spherical graphite materials have good electrical conductivity, high crystallinity, low cost, high theoretical lithium intercalation capacity, low and flat charge and discharge potential, etc. It is an important part of the anode material for lithium-ion batteries, and is a replacement product for the anode material used in the production of lithium-ion batteries at home and abroad. It has excellent electrical conductivity and chemical stability, high charge and discharge capacity, long cycle life, and is environmentally friendly; in the process of spherical graphite processing, first, the graphite dry concentrate is processed through processes such as coarse crushing, trimming, and magnetic separation in the spherical graphite workshop to form the initial product, spherical graphite, and then it enters the purification workshop and becomes spherical graphite after high-temperature purification; in the existing spherical graphite production system, an air flow crushing and classification machine is often used. However, during the crushing process of graphite materials in the air flow crushing and classification machine, the larger coarse powders in the coarse powders that do not reach the fineness can fall back to the crushing area by gravity, while some materials with smaller volumes but not meeting the requirements will be driven by the high-speed air flow and stay in the air, requiring a longer time for crushing, resulting in low crushing efficiency. For this reason, we have proposed a spherical graphite production system. Summary of the Invention

[0003] (I) Technical Problems to be Solved

[0004] In view of the deficiencies of the prior art, the present invention provides a spherical graphite production system, which solves the above problems.

[0005] (II) Technical Solutions

[0006] To achieve the above object, the present invention provides the following technical solution: A spherical graphite production system includes a graphite material storage bin. The feeding end of the graphite material storage bin is connected to a coarse crusher. The feeding end of the coarse crusher is connected to a feeder. The feeding end of the feeder is connected to an ultra-fine air flow crusher. The top feeding end of the ultra-fine air flow crusher is connected to an air flow classifier. The feeding ends of the air flow classifier are respectively connected to a spherical graphite shaping machine and a pulse dust collector. The top of the air flow classifier is fixedly installed with a classification motor, and the output shaft of the classification motor penetrates into the inner wall of the air flow classifier and is fixedly connected to a high-speed rotating shaft. A chassis seat is fixedly installed on the side inner wall of the air flow classifier corresponding to the lower part of the high-speed rotating shaft, and a classification wheel is connected to the air flow classifier through the high-speed rotating shaft and the chassis seat inside the air flow classifier. A negative pressure grinding and secondary crushing mechanism connected to the high-speed rotating shaft is arranged inside the classification wheel.

[0007] Preferably, the classifying wheel comprises an upper flange ring, a lower flange ring and impeller blades, the impeller blades are fixedly connected between the bottom outer wall of the upper flange ring and the top outer wall of the lower flange ring, the inner diameters of the upper flange ring and the lower flange ring are the same, and the end face outer diameter of the upper flange ring is larger than the end face outer diameter of the lower flange ring.

[0008] Preferably, the bottom end of the high-speed rotating shaft extends to the inside of the grading wheel, and a center ring flush with the upper flange ring is fixedly sleeved on the high-speed rotating shaft, and four groups of connecting thin cross bars are fixedly connected between the center ring and the upper flange ring, and the four groups of connecting thin cross bars are equidistantly distributed in a ring shape.

[0009] Preferably, a limiting snap ring groove adapted to the lower flange ring is provided on the top outer wall of the chassis seat, and the bottom end of the lower flange ring in the classifying wheel is rotatably engaged in the limiting snap ring groove provided on the chassis seat, and the end face diameter of the chassis seat is larger than the end face diameter of the lower flange ring and seals the bottom end of the classifying wheel.

[0010] Preferably, the negative pressure grinding secondary crushing mechanism comprises a grinding lower concave plate and a grinding upper concave plate, the bottom plate seat is fixedly connected to a plurality of connecting vertical columns on the top outer wall corresponding to the inner part of the grading wheel, and the bottom plate seat is fixedly connected to the grinding lower concave plate located inside the grading wheel through a plurality of connecting vertical columns, the top of the grinding lower concave plate is open, the bottom end of the high-speed rotating shaft is fixedly connected to the grinding upper concave plate located inside the grading wheel, and the lower half of the grinding upper concave plate is clamped in the grinding lower concave plate, the bottom inner wall of the grinding lower concave plate is provided with an integrated grinding protrusion which arches upward to form an arc surface at the center, the bottom of the grinding upper concave plate is provided with an upper grinding groove adapted to the grinding protrusion, the grinding protrusion inside the grinding lower concave plate and the upper grinding groove at the bottom of the grinding upper concave plate form a grinding cavity, and the interval gap between the grinding protrusion in the grinding lower concave plate and the upper grinding groove at the bottom of the grinding upper concave plate gradually decreases from the outside to the center, and the outer side of the grinding lower concave plate is provided with a plurality of feeding ports.

[0011] Preferably, the upper grinding concave plate corresponds to the area above the grinding protrusion and has a plurality of groups of discharge holes that pass through from top to bottom, and the discharge holes in the upper grinding concave plate corresponding to the part covered by the bottom end of the high-speed rotating shaft are bent and communicated with other discharge holes.

[0012] Preferably, the outer circle of the grinding lower concave disk is arc-shaped and has a semicircular cross-section, a stepped groove is provided in the middle of the grinding upper concave disk, which is fitted with the side of the opening at the top of the grinding lower concave disk, and the upper half of the grinding upper concave disk bounded by the stepped groove is higher than the top of the grinding lower concave disk, and the end face diameter of the upper half of the grinding upper concave disk is smaller than the end face diameter of the lower half located in the grinding lower concave disk.

[0013] Preferably, the multiple groups of feed openings on the grinding lower concave disk are distributed in a circular shape with equal spacing and are located at the outermost spacing gaps of the grinding protrusions in the grinding upper concave disk and the grinding lower concave disk.

[0014] (3) Beneficial effects

[0015] Compared with the prior art, the present invention provides a spherical graphite production system, which has the following beneficial effects:

[0016] 1. When the spherical graphite production system classifies the graphite material in the ultrafine airflow mill through the airflow classifier, the finer graphite particles will enter the inside of the grinding concave disc through the feed through hole opened on the outside of the grinding concave disc along with the airflow and fill the gap of the grinding cavity between the grinding protrusions and the grinding upper concave disc. The fine graphite particles meeting the predetermined standard are subjected to a greater airflow drag force and are discharged through the discharge through hole along with the airflow. However, some finer particles that do not meet the predetermined standard will hover between the bottom of the grinding upper concave disc and the grinding protrusions. When the high-speed rotating shaft drives the classifier wheel to rotate at a high speed, it will drive the grinding upper concave disc to rotate at a high speed, so that the space filled with the grinding upper concave disc inside the grinding lower concave disc forms a negative pressure, which will cause the fine material to enter the grinding lower concave disc. At the same time, the high-speed rotation of the grinding upper concave disc and the grinding protrusions in the grinding lower concave disc also form a grinding structure, so as to grind some of the fine materials hovering inside the grinding lower concave disc to complete secondary crushing, so as to reach the predetermined standard of graphite powder and complete the discharge with the airflow through the discharge through hole, solve the problem that some small graphite materials that do not meet the predetermined standard hover in the classifier wheel, ensure the integrity and sufficiency of the material crushing and discharging during the production of spherical graphite, and thus improve the production efficiency of spherical graphite. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the spherical graphite production system of the present invention;

[0018] Figure 2 Schematic diagram of the structure of the airflow classifier of the present invention;

[0019] Figure 3 Cross-sectional view of the airflow classifier of the present invention;

[0020] Figure 4 Cross-sectional view of the classifier wheel of the present invention;

[0021] Figure 5 Cross-sectional view of the grinding lower concave disc of the present invention;

[0022] Figure 6 Cross-sectional view of the grinding upper concave disc of the present invention.

[0023] In the figure: 1. Graphite material storage bin; 2. Coarse crusher; 3. Feeder; 4. Ultrafine air-flow pulverizer; 5. Air classifier; 6. Spherical graphite shaping machine; 7. Pulse dust collector; 8. Classification motor; 9. High-speed rotating shaft; 10. Classification wheel; 11. Chassis base; 12. Negative-pressure grinding secondary pulverizing mechanism; 13. Upper flange ring; 14. Lower flange ring; 15. Impeller blade; 16. Connecting thin cross bar; 17. Grinding lower concave disc; 18. Grinding upper concave disc; 19. Limit snap ring groove; 20. Connecting vertical column; 21. Grinding protrusion; 22. Feed port; 23. Grinding upper groove; 24. Discharge through hole; 25. Step-type card slot. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Please refer to Figure 1-6 , a spherical graphite production system, including a graphite material storage bin 1, the feeding end of the graphite material storage bin 1 is connected to a coarse crusher 2, the feeding end of the coarse crusher 2 is connected to a feeder 3, the feeding end of the feeder 3 is connected to an ultrafine air-flow pulverizer 4, the top feeding end of the ultrafine air-flow pulverizer 4 is connected to an air classifier 5, the feeding ends of the air classifier 5 are respectively connected to a spherical graphite shaping machine 6 and a pulse dust collector 7, a classification motor 8 is fixedly installed at the top end of the air classifier 5, and the output shaft of the classification motor 8 penetrates into the inner wall of the air classifier 5 and is fixedly connected to a high-speed rotating shaft 9. A chassis base 11 is fixedly installed on the side inner wall of the air classifier 5 corresponding to the lower part of the high-speed rotating shaft 9, and a classification wheel 10 is connected inside the air classifier 5 through the high-speed rotating shaft 9 and the chassis base 11. A negative-pressure grinding secondary pulverizing mechanism 12 connected to the high-speed rotating shaft 9 is arranged inside the classification wheel 10.

[0026] The classification wheel 10 includes an upper flange ring 13, a lower flange ring 14 and impeller blades 15. There is a fixed connection of impeller blades 15 between the outer wall of the bottom of the upper flange ring 13 and the outer wall of the top of the lower flange ring 14. The inner diameters of the upper flange ring 13 and the lower flange ring 14 are the same, and the outer diameter of the end face of the upper flange ring 13 is greater than the outer diameter of the end face of the lower flange ring 14. The bottom end of the high-speed rotating shaft 9 extends into the interior of the classification wheel 10, and a central ring flush with the upper flange ring 13 is fixedly sleeved on the high-speed rotating shaft 9. Four connecting thin cross bars 16 are fixedly connected between the central ring and the upper flange ring 13. The four connecting thin cross bars 16 are evenly distributed in a ring at equal intervals. A limiting snap ring groove 19 adapted to the lower flange ring 14 is provided on the outer wall of the top of the chassis base 11, and the bottom end of the lower flange ring 14 in the classification wheel 10 is rotatably clamped in the limiting snap ring groove 19 provided on the chassis base 11. The end face diameter of the chassis base 11 is greater than the end face diameter of the lower flange ring 14 and seals the bottom end of the classification wheel 10. When pulverizing and classifying graphite production, the classification motor 8 can be driven to drive the classification wheel 10 to rotate at a high speed through the high-speed rotating shaft 9. At this time, the four connecting thin cross bars 16 connected between the high-speed rotating shaft 9 and the upper flange ring 13 will cause the classification wheel 10 to rotate. At the same time, the lower flange ring 14 at the bottom end of the classification wheel 10 will rotate synchronously along the limiting snap ring groove 19 provided on the chassis base 11. The material pulverized by the ultrafine air flow pulverizer 4 will rise with the air flow. When the classification wheel 10 rotates at a high speed, a negative pressure area is formed below it, so that the air flow has a component velocity both axially and circumferentially, and the pulverized graphite material is carried through the gaps between the impeller blades 15 into the interior of the classification wheel 10. Through the interaction of centripetal drag force, centrifugal force and gravity on the graphite material, the classification of coarse and fine particles is completed. After the graphite material enters the interior of the classification wheel 10, the coarse particles will be affected by centrifugal force and their own gravity and will pass through the classification wheel 10 and fall into the ultrafine air flow pulverizer 4 for further pulverization.

[0027] The negative-pressure grinding secondary crushing mechanism 12 includes a grinding lower concave disk 17 and a grinding upper concave disk 18. A plurality of connecting vertical columns 20 are fixedly connected to the top outer wall of the chassis base 11 corresponding to the inside of the classification wheel 10. And the chassis base 11 is fixedly connected with a grinding lower concave disk 17 located inside the classification wheel 10 through a plurality of connecting vertical columns 20. The top end of the grinding lower concave disk 17 is open. A high-speed rotating shaft 9 is fixedly connected with a grinding upper concave disk 18 at the bottom end inside the classification wheel 10. And the lower half of the grinding upper concave disk 18 is clamped in the grinding lower concave disk 17. An integrated grinding protrusion 21 with an upward-arching arc surface at the center is provided on the bottom inner wall of the grinding lower concave disk 17. A grinding upper groove 23 adapted to the grinding protrusion 21 is opened at the bottom of the grinding upper concave disk 18. The grinding protrusion 21 inside the grinding lower concave disk 17 and the grinding upper groove 23 at the bottom of the grinding upper concave disk 18 form a grinding cavity. And the spacing gap between the grinding protrusion 21 in the grinding lower concave disk 17 and the grinding upper groove 23 at the bottom of the grinding upper concave disk 18 gradually becomes smaller from the outside to the center. When a grinding structure is formed by the high-speed rotation of the grinding upper concave disk 18 and the grinding protrusion 21 in the grinding lower concave disk 17, through the grinding cavity gap that decreases from large to small, it can be ensured that all graphite materials will enter the grinding cavity formed by the grinding lower concave disk 17 and the grinding upper concave disk 18 from the largest spacing gap on the side, and the materials can be gradually ground and crushed, further crushing the graphite materials sufficiently. A plurality of feed openings 22 are opened on the outside of the grinding lower concave disk 17. When the high-speed rotating shaft 9 drives the classification wheel 10 to rotate at a high speed, it will drive the grinding upper concave disk 18 to rotate at a high speed, thereby making the grinding upper concave disk 18 fill the space inside the grinding lower concave disk 17 to form a negative pressure, so that fine materials will enter the grinding lower concave disk 17.

[0028] The finer graphite particles will enter the inside of the grinding lower concave disk 17 through the feed openings 22 opened on the outside of the grinding lower concave disk 17 along with the airflow and fill the grinding cavity gap between the grinding protrusion 21 and the grinding upper concave disk 18. A plurality of vertically penetrating discharge through holes 24 are opened in the area of the grinding upper concave disk 18 corresponding to the upper part of the grinding protrusion 21. The fine graphite particles meeting the predetermined standard are subjected to a greater airflow drag force and are discharged through the discharge through holes 24 along with the airflow. After that, some finer particles that do not meet the predetermined standard will hover between the bottom of the grinding upper concave disk 18 and the grinding protrusion 21, thereby grinding some of the fine materials hovering inside the grinding lower concave disk 17 to complete secondary crushing, and crushing the hovering graphite fine materials into graphite powder meeting the predetermined standard.

[0029] The part of the discharge through-hole 24 in the upper grinding concave disk 18 corresponding to the bottom end of the high-speed rotating shaft 9 is bent and communicated with other discharge through-holes 24. The area corresponding to the lower part of the high-speed rotating shaft 9 between the grinding protrusions 21 in the upper grinding concave disk 18 and the lower grinding concave disk 17 is the narrowest grinding cavity gap, and the finest ground graphite powder after grinding and crushing will be generated. However, the bottom end of the high-speed rotating shaft 9 will block the discharge. Therefore, the part of the discharge through-hole 24 located below the high-speed rotating shaft 9 is set to be bent to communicate with other discharge through-holes 24, so as to complete the discharge of the graphite powder.

[0030] The outer circle of the lower grinding concave disk 17 is arc-shaped and its cross-section is semi-circular. A stepped card slot 25 is provided in the middle of the upper grinding concave disk 18, which fits the side of the top opening of the lower grinding concave disk 17. The upper half of the upper grinding concave disk 18 bounded by the stepped card slot 25 protrudes above the top of the lower grinding concave disk 17, and the end face diameter of the upper half of the upper grinding concave disk 18 is smaller than the end face diameter of the lower half located in the lower grinding concave disk 17.

[0031] Multiple groups of feed ports 22 on the lower grinding concave disk 17 are annularly and equidistantly distributed and are located in the spaced gap between the upper grinding concave disk 18 and the outermost side of the grinding protrusions 21 in the lower grinding concave disk 17.

[0032] Working principle: When producing spherical graphite, the graphite raw materials in the graphite material storage bin 1 are coarsely crushed by the coarse crusher 2 to form small pieces of graphite fragments. Then, the coarsely crushed materials are put into the ultrafine air flow crusher 4 by the feeder 3 for fine crushing. At the same time, the graphite powder in the ultrafine air flow crusher 4 is classified by the air classifier 5. The graphite powder meeting the predetermined standard will enter the spherical graphite shaping machine 6 for shaping to form spherical graphite, and the graphite materials not meeting the predetermined standard will continue to fall into the ultrafine air flow crusher 4 for crushing operation. Moreover, the pulse dust collector 7 will collect the dust generated during the material production of the ultrafine air flow crusher 4 and the air classifier 5 to ensure a dust-free working environment.

[0033] When classifying the graphite material in the ultrafine air mill 4 by the air classifier 5, it is necessary to drive the classification motor 8 and drive the classification wheel 10 to rotate at high speed through the high-speed rotating shaft 9. At this time, the four connecting thin cross bars 16 connected between the high-speed rotating shaft 9 and the upper flange ring 13 will cause the classification wheel 10 to rotate. At the same time, the lower flange ring 14 at the bottom of the classification wheel 10 will rotate synchronously along the limit snap ring groove 19 opened on the chassis base 11. The material pulverized by the ultrafine air mill 4 will rise with the air flow. When the classification wheel 10 rotates at high speed, a negative pressure area is formed below it, so that there are component velocities of the air flow in both the axial and circumferential directions, and the pulverized graphite material is carried through the gaps between the impeller blades 15 into the inside of the classification wheel 10. Through the interaction of the centripetal drag force, centrifugal force and gravity on the graphite material, the classification of coarse and fine particles is completed. After the graphite material enters the inside of the classification wheel 10, the coarse particles will pass through the classification wheel 10 under the influence of centrifugal force and its own gravity and fall into the ultrafine air mill 4 for further pulverization. The finer graphite particles will enter the inside of the grinding concave disk 17 through the feed through hole 22 opened on the outside of the grinding concave disk 17 with the air flow and fill the grinding cavity gap between the grinding protrusions 21 and the grinding upper concave disk 18. The fine graphite particles that meet the predetermined standard are discharged with the air flow through the discharge through hole 24 due to the greater drag force of the air flow. However, some of the finer particles that do not meet the predetermined standard will hover between the bottom of the grinding upper concave disk 18 and the grinding protrusions 21. When the high-speed rotating shaft 9 drives the classification wheel 10 to rotate at high speed, it will drive the grinding upper concave disk 18 to rotate at high speed, so that the space filled with the grinding upper concave disk 18 inside the grinding concave disk 17 forms a negative pressure, so that the fine material will enter the grinding concave disk 17. At the same time, the high-speed rotation of the grinding upper concave disk 18 and the grinding protrusions 21 in the grinding concave disk 17 also form a grinding structure, so as to grind some of the fine materials hovering inside the grinding concave disk 17 to complete secondary pulverization, so as to obtain graphite powder that meets the predetermined standard and complete the discharging with the air flow through the discharge through hole 24.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spherical graphite production system, comprising a graphite material storage bin (1), wherein the feeding end of the graphite material storage bin (1) is connected to a coarse crusher (2), the feeding end of the coarse crusher (2) is connected to a feeder (3), the feeding end of the feeder (3) is connected to an ultrafine airflow pulverizer (4), the top feeding end of the ultrafine airflow pulverizer (4) is connected to an airflow classifier (5), and the feeding end of the airflow classifier (5) is respectively connected to a spherical graphite shaping machine (6) and a pulse dust collector (7), Features: A classifying motor (8) is fixedly mounted on the top of the airflow classifier (5), and an output shaft of the classifying motor (8) penetrates through the inner wall of the airflow classifier (5) and is fixedly connected to a high-speed rotating shaft (9); a chassis seat (11) is fixedly mounted on the side inner wall of the airflow classifier (5) corresponding to the lower side of the high-speed rotating shaft (9); a classifying wheel (10) is connected to the inside of the airflow classifier (5) via the high-speed rotating shaft (9) and the chassis seat (11); a negative pressure grinding secondary crushing mechanism (12) connected to the high-speed rotating shaft (9) is arranged inside the classifying wheel (10); The negative pressure grinding secondary crushing mechanism (12) comprises a grinding lower concave disc (17) and a grinding upper concave disc (18); the bottom disc seat (11) is fixedly connected to a plurality of groups of connecting vertical columns (20) on the top outer wall corresponding to the inside of the classifying wheel (10); the bottom disc seat (11) is fixedly connected to the grinding lower concave disc (17) located inside the classifying wheel (10) through the plurality of connecting vertical columns (20); the top of the grinding lower concave disc (17) is open; the bottom end of the high-speed rotating shaft (9) located inside the classifying wheel (10) is fixedly connected to the grinding upper concave disc (18); and the lower half of the grinding upper concave disc (18) is clamped in the grinding lower concave disc (17). The inner wall of the bottom of the grinding lower concave disk (17) is provided with an integrated grinding protrusion (21) which is arched upward at the center to form an arc surface, and the bottom of the grinding upper concave disk (18) is provided with a grinding upper groove (23) adapted to the grinding protrusion (21), the grinding protrusion (21) inside the grinding lower concave disk (17) and the grinding upper groove (23) at the bottom of the grinding upper concave disk (18) form a grinding cavity, and the interval between the grinding protrusion (21) in the grinding lower concave disk (17) and the grinding upper groove (23) at the bottom of the grinding upper concave disk (18) gradually decreases from the outside to the center, and the outer side of the grinding lower concave disk (17) is provided with multiple groups of feeding ports (22); The grinding upper concave plate (18) is provided with a plurality of groups of discharge holes (24) which are connected vertically in the area above the grinding protrusion (21), and the portion of the discharge holes (24) in the grinding upper concave plate (18) corresponding to the portion covered by the bottom end of the high-speed rotating shaft (9) is bent and communicated with the other discharge holes (24); The outer ring of the grinding concave disk (17) is arc-shaped and has a semi-circular cross-section. A stepped card slot (25) that fits the side of the top opening of the grinding concave disk (17) is provided in the middle of the grinding convex disk (18). The upper half of the grinding convex disk (18) bounded by the stepped card slot (25) protrudes above the top of the grinding concave disk (17). The end face diameter of the upper half of the grinding convex disk (18) is smaller than the end face diameter of the lower half located in the grinding concave disk (17). Multiple groups of feed openings (22) on the grinding concave disk (17) are annularly and equidistantly distributed and are located in the spaced gaps at the outermost sides of the grinding protrusions (21) in the grinding convex disk (18) and the grinding concave disk (17).

2. A spherical graphite production system according to claim 1, characterized in that: The grading wheel (10) includes an upper flange ring (13), a lower flange ring (14), and impeller blades (15). An impeller blade (15) is fixedly connected between the outer wall of the bottom of the upper flange ring (13) and the outer wall of the top of the lower flange ring (14). The inner diameters of the upper flange ring (13) and the lower flange ring (14) are the same, and the outer diameter of the end face of the upper flange ring (13) is greater than the outer diameter of the end face of the lower flange ring (14).

3. A spherical graphite production system according to claim 2, characterized in that: The bottom end of the high-speed rotating shaft (9) extends into the interior of the grading wheel (10). A central ring flush with the upper flange ring (13) is fixedly sleeved on the high-speed rotating shaft (9). Four connecting thin cross bars (16) are fixedly connected between the central ring and the upper flange ring (13). The four connecting thin cross bars (16) are annularly and equidistantly distributed.

4. A spherical graphite production system according to claim 3, characterized in that: A limit snap ring groove (19) adapted to the lower flange ring (14) is provided on the outer wall of the top of the chassis base (11). The bottom end of the lower flange ring (14) in the grading wheel (10) is rotatably snapped into the limit snap ring groove (19) provided on the chassis base (11). The end face diameter of the chassis base (11) is greater than the end face diameter of the lower flange ring (14) and seals the bottom end of the grading wheel (10).

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