High-purity spherical graphite multi-stage fine purification device and method

Abstract

This invention relates to the field of graphite material purification equipment, and discloses a multi-stage fine purification device for high-purity spherical graphite, including a main support frame. The upper surface of the main support frame is equipped with a dispersing and conveying mechanism for conveying and dispersing graphite. An outer shell is fixedly connected inside the main support frame, and a rolling filter screen is rotatably connected inside the outer shell. A cleaning and dust collection mechanism for cleaning the rolling filter screen and screening and collecting internal dust is provided at the upper end of the outer shell. A stirring and filtering mechanism for the rotating rolling filter screen is provided above the front end of the main support frame. A circulating recovery mechanism for circulating screening of graphite is provided at the rear end of the main support frame. The circulating screening by the circulating recovery mechanism, combined with dust collection through the dust inlet and dust guide pipe, significantly improves the grading accuracy and finished product purity, achieving continuous closed-loop production, effectively reducing equipment maintenance costs, and improving the stability and production efficiency of the device.

Description

Technical Field

[0001] This invention relates to the field of graphite material purification equipment, specifically providing a multi-stage fine purification device and method for high-purity spherical graphite. Background Technology

[0002] Currently, most high-purity spherical graphite purification devices on the market adopt a single uniform feeding structure in the raw material pretreatment stage. This structure cannot be precisely matched with the downstream purification process, which easily leads to problems such as material accumulation and uneven feeding. At the same time, conventional grinding and shaping structures easily damage the original spherical morphology of graphite, making it difficult to complete effective classification in the pretreatment stage. A large number of irregularly shaped particles and coarse-fine mixed materials flow directly into the subsequent processes, significantly increasing the operating load of multi-stage purification equipment and reducing the overall purification efficiency.

[0003] Traditional purification equipment typically uses screens with uniform apertures for sieving, which cannot achieve graded screening of materials. This results in low sieving accuracy, and fine graphite powder easily embeds itself inside the screen holes, causing blockages. Relying solely on vibration cleaning is insufficient to completely clear the screen holes, usually requiring manual cleaning during machine shutdown, which severely impacts continuous production. Furthermore, existing sieving equipment lacks a linked cleaning and directional dust collection structure, resulting in incomplete removal of impurities during sieving and the dispersion of fine dust, leading to raw material waste and hindering further improvement in the purity of the spherical graphite product. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-stage fine purification device and method for high-purity spherical graphite, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage fine purification device for high-purity spherical graphite, comprising a main support frame, wherein a dispersing and conveying mechanism for conveying and dispersing graphite is provided on the upper surface of the main support frame, an outer shell is fixedly connected inside the main support frame, a rolling filter screen is rotatably connected inside the outer shell, a cleaning and dust collection mechanism for cleaning the rolling filter screen and screening and collecting internal dust is provided at the upper end of the outer shell, a stirring and filtering mechanism for rotating the rolling filter screen is provided above the front end of the main support frame, and a recycling and recovery mechanism for circulating screening of graphite is provided at the rear end of the main support frame.

[0006] Preferably, the cleaning and vacuuming mechanism includes an air chamber fixedly connected to the upper surface of the outer shell, an air pump fixedly connected to the side surface of the air chamber, a cleaning brush and a vibrating tapping shaft rotatably connected inside the air chamber, a third gear fixedly connected to the outer surface of the cleaning brush, an annular tooth fixedly connected to the outer surface of the rolling filter, a drive belt drivingly connected to the outer surface of the cleaning brush, and a multi-stage discharge port fixedly connected to the lower part of the outer shell.

[0007] Preferably, a closed head is fixedly connected to the rear end of the main support frame, a dust inlet is fixedly connected to the outer side of the closed head, a dust guide tube is fixedly connected to the inside of the closed head, a first rotating rod is rotatably connected to the inside of the dust inlet, and a blower and a dispersing rod are fixedly connected to the outer surface of the first rotating rod.

[0008] Preferably, the dispersing and conveying mechanism includes a conveying support frame fixedly connected to the upper surface of the main support frame. A conveying trough is fixedly connected inside the conveying support frame. A connecting pipe is fixedly connected to the front end of the conveying trough. A conveying motor is fixedly connected to the rear end of the conveying trough. A conveying screw is fixedly connected to the output shaft of the conveying motor. A first gear is fixedly connected to the outer surface of the conveying screw. A second gear is rotatably connected to the rear side of the conveying trough. A pushing inclined plate is fixedly connected to one side of the second gear. A pulling rod is slidably connected inside the conveying trough. A conveying scraper is fixedly connected inside the pulling rod. A pushing block is fixedly connected to one end of the pulling rod. A telescopic rod is fixedly connected to one side of the pushing block. A spring is sleeved on the outer surface of the telescopic rod. A first fixing frame is fixedly connected to the rear side of the conveying trough.

[0009] Preferably, the stirring and filtering mechanism includes a second fixed frame fixedly connected to the upper surface of the main support frame, a rotating shaft rotatably connected inside the second fixed frame, a first connecting gear and a second connecting gear fixedly connected to the outer surface of the rotating shaft, a ring gear fixedly connected to the front end of the rolling filter screen, a rotating motor fixedly connected inside the second fixed frame, a second rotating rod fixedly connected to the output shaft of the rotating motor, a driving gear fixedly connected to the outer surface of the second rotating rod, and a driven gear fixedly connected to the outer surface of the first rotating rod.

[0010] Preferably, the recycling mechanism includes a circulation pipe fixedly connected to one side of the main support frame, a connecting material pipe fixedly connected to the upper end of the circulation pipe, a connecting transmission gear rotatably connected to the inside of the circulation pipe, a fourth gear fixedly connected to the outer surface of the connecting transmission gear, a double-layer transmission belt rotatably connected to the inside of the circulation pipe, a limit rotating rod rotatably connected to the inside of the circulation pipe, and a conveying block fixedly connected to the upper surface of the double-layer transmission belt.

[0011] Preferably, the pushing inclined plate is disposed on one side of the pushing block, the telescopic rod is fixedly connected to one side of the first fixed frame, the first gear is meshed with the second gear, the pushing block and the first fixed frame are fixedly connected by the telescopic rod, the conveying screw is rotatably connected inside the conveying groove, the third gear is meshed with the ring gear, the cleaning brush and the vibrating tapping shaft are connected by a transmission belt, the dust inlet is connected to the dust guide pipe, the bottom end of the dust guide pipe is open, and the first rotating rod is rotatably connected inside the connecting pipe.

[0012] Preferably, the ring gear meshes with the second connecting gear, the first connecting gear meshes with the driving gear, the driving gear meshes with the driven gear, the fourth gear meshes with the ring gear, and the connecting transmission rack and the limiting rotating rod are connected inside the double-layer transmission belt.

[0013] A multi-stage fine purification method for high-purity spherical graphite includes the following steps: S1: Raw materials enter the device through the dispersing and conveying mechanism. The conveying motor drives the conveying screw to rotate and convey the material. The first gear and the second gear mesh to drive the inclined plate to move. When the inclined plate moves, it pushes the spring to contract, thereby causing the pulling rod to drive the conveying scraper to move backward. When the conveying scraper moves back and forth, it disperses and pushes the material. The telescopic rod and the spring adaptively adjust the pushing pressure and reset, so that the material is evenly fed into the inside of the rolling filter screen to complete the pre-treatment conveying.

[0014] S2: The rotating motor drives the rolling filter screen to rotate through the second rotating rod, the drive gear, the first connecting gear, the rotating shaft, the second connecting gear, and the ring gear. The filter holes on the rolling filter screen gradually decrease in size from left to right to achieve gradient screening. The ring gear drives the third gear to rotate, which in turn drives the cleaning brush and the vibrating beater shaft to move synchronously through the transmission belt. Together with the air blowing chamber and the air blowing pump, the air blows downward to clean the impurities in the mesh. Fine dust is collected through the dust guide pipe and the dust inlet.

[0015] S3: Substandard particles enter the recycling mechanism. The rotating rolling filter screen drives the fourth gear to rotate through the ring tooth. The rotating fourth gear drives the connecting transmission rack to rotate. The connecting transmission rack drives the double-layer transmission belt to rotate. The material is sent back to the rolling filter screen for screening again through the double-layer transmission belt and the conveyor block. Qualified products are discharged through multi-stage outlets, completing the closed-loop multi-stage fine purification.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention achieves simultaneous screening and self-cleaning through a gradient screening structure of a rolling filter screen, an air chamber, an air pump, a cleaning brush, a vibrating tapping shaft, an annular tooth, and a transmission belt. This efficiently removes impurities clogging the mesh without requiring machine shutdown for cleaning. Combined with the circulating screening of the recycling mechanism and the dust collection of the dust inlet and dust guide pipe, it significantly improves the grading accuracy and finished product purity, realizes continuous closed-loop production, effectively reduces equipment maintenance costs, and improves the stability and production efficiency of the device.

[0017] 2. This invention achieves uniform conveying and pre-treatment of raw materials through a dispersing and conveying mechanism. With the coordinated action of the conveying motor, conveying screw, pushing inclined plate, conveying scraper, telescopic rod and spring, it effectively avoids material agglomeration and uneven feeding, ensuring stable material entry into the rolling filter screen from the source, and significantly reducing the subsequent purification load. At the same time, the pre-treatment process can perform preliminary shaping and grading of materials, reduce the mixing of irregular particles and coarse particles, protect the integrity of spherical graphite morphology, and improve the overall purification efficiency and raw material utilization rate. Attached Figure Description

[0018] Figure 1 This is a front view of a multi-stage fine purification device and method for high-purity spherical graphite proposed in this invention; Figure 2 For the present invention Figure 1 Enlarged view of point A; Figure 3 This is a cross-sectional view of the cleaning mechanism of a multi-stage fine purification device and method for high-purity spherical graphite proposed in this invention. Figure 4 For the present invention Figure 3 Enlarged view of point B; Figure 5 This is a side cross-sectional view of a multi-stage fine purification device and method for high-purity spherical graphite proposed in this invention. Figure 6 For the present invention Figure 5 Enlarged view of point C; Figure 7 For the present invention Figure 5 Enlarged view of point D; Figure 8 This is a cross-sectional view of the recycling mechanism of a multi-stage fine purification device and method for high-purity spherical graphite proposed in this invention.

[0019] Legend: 1. Main support frame; 2. Dispersing and conveying mechanism; 200. Conveyor motor; 201. Conveyor support frame; 202. Conveying trough; 203. Connecting pipe; 204. Conveying screw; 205. First gear; 206. Second gear; 207. Pushing inclined plate; 208. Pulling rod; 209. Conveying scraper; 210. Pushing block; 211. Telescopic rod; 212. Spring; 213. First fixed frame; 3. Cleaning and dust collection mechanism; 301. Air chamber; 302. Air pump; 303. Cleaning brush; 304. Vibrating tapping shaft; 305. Third gear; 306. Ring gear; 307. Transmission belt; 308. Dust inlet; 309. Dust guide. 310. Pipe; 311. First rotating rod; 312. Blowing fan; 313. Dispersing rod; 4. Stirring and filtering mechanism; 401. Second fixed frame; 402. Rotating shaft; 403. First connecting gear; 404. Second connecting gear; 405. Ring gear; 406. Rotating motor; 407. Second rotating rod; 408. Driving gear; 409. Driven gear; 5. Circulation and recycling mechanism; 501. Circulation pipe; 502. Connecting material pipe; 503. Connecting transmission rack; 504. Fourth gear; 505. Double-layer transmission belt; 506. Limiting rotating rod; 507. Conveying block; 6. Outer shell; 7. Rolling filter screen; 8. Multi-stage discharge port; 9. Sealing head. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0022] like Figures 1-8 The high-purity spherical graphite multi-stage fine purification device shown includes a main support frame 1. The upper surface of the main support frame 1 is provided with a dispersing and conveying mechanism 2 for conveying and dispersing graphite. An outer shell 6 is fixedly connected inside the main support frame 1. A rolling filter screen 7 is rotatably connected inside the outer shell 6. A cleaning and dust collection mechanism 3 is provided at the upper end of the outer shell 6 for cleaning the rolling filter screen 7 and screening and collecting the internal dust. A stirring and filtering mechanism 4 for rotating the rolling filter screen 7 is provided above the front end of the main support frame 1. A recycling and recovery mechanism 5 for circulating screening of graphite is provided at the rear end of the main support frame 1.

[0023] The cleaning and vacuuming mechanism 3 includes an air chamber 301 fixedly connected to the upper surface of the outer shell 6. An air pump 302 is fixedly connected to the side surface of the air chamber 301. A cleaning brush 303 and a vibrating tapping shaft 304 are rotatably connected inside the air chamber 301. A third gear 305 is fixedly connected to the outer surface of the cleaning brush 303. A ring tooth 306 is fixedly connected to the outer surface of the rolling filter screen 7. A transmission belt 307 is driven to the outer surface of the cleaning brush 303. A closed head 9 is fixedly connected to the rear end of the main support frame 1. A dust inlet 308 is fixedly connected to the outer side of the closed head 9. A dust guide tube 309 is fixedly connected inside the closed head 9. A first rotating rod 310 is rotatably connected inside the dust inlet 308. A blower 311 and a dispersing rod 312 are fixedly connected to the outer surface of the first rotating rod 310. A multi-stage discharge port 8 is fixedly connected to the bottom of the outer shell 6.

[0024] Furthermore, the gradient pore structure of the rolling filter screen 7, with the pores gradually decreasing in size from left to right, enables graded screening of graphite materials from coarse to fine, resulting in clear grading and high screening accuracy. Combined with a purely mechanical linkage design between various mechanisms, it achieves integrated synchronous operation of conveying, dispersing, screening, cleaning, circulation, and dust collection without complex electrical control. Then, the annular teeth 306 on the outer wall of the rolling filter screen 7, in conjunction with the third gear 305, synchronously drives the cleaning brush 303 and the vibrating tapping shaft 304. Combined with the downward blowing action of the air chamber 301 and the air pump 302, it achieves dual cleaning of the surface and interior of the rolling filter screen 7, efficiently removing clogged impurities and preventing screen blockage. Simultaneously, the dust guide pipe 309 and dust inlet 308 centrally collect fine dust, preventing dust leakage and pollution, and improving screening purity and the cleanliness of the working environment.

[0025] The dispersing and conveying mechanism 2 includes a conveying support frame 201 fixedly connected to the upper surface of the main support frame 1. A conveying trough 202 is fixedly connected inside the conveying support frame 201. A connecting pipe 203 is fixedly connected to the front end of the conveying trough 202. A conveying motor 200 is fixedly connected to the rear end of the conveying trough 202. A conveying screw 204 is fixedly connected to the output shaft of the conveying motor 200. A first gear 205 is fixedly connected to the outer surface of the conveying screw 204. A second gear 206 is rotatably connected to the rear side of the conveying trough 202. A pushing inclined plate 207 is fixedly connected to one side of the second gear 206. A pulling rod 208 is slidably connected inside the conveying trough 202. A conveying scraper 209 is fixedly connected inside the pulling rod 208. A pushing block 210 is fixedly connected to one end of the pulling rod 208. A pushing block 210 is fixedly connected to one side of the pushing block 210. A telescopic rod 211 is provided, with a spring 212 sleeved on its outer surface. A first fixed frame 213 is fixedly connected to the rear side of the conveying trough 202. A pushing inclined plate 207 is set on one side of the pushing block 210. The telescopic rod 211 is fixedly connected to one side of the first fixed frame 213. A first gear 205 meshes with a second gear 206. The pushing block 210 and the first fixed frame 213 are fixedly connected through the telescopic rod 211. A conveying screw 204 is rotatably connected inside the conveying trough 202. A third gear 305 meshes with a ring gear 306. A cleaning brush 303 and a vibrating tapping shaft 304 are connected by a transmission belt 307. A dust inlet 308 is connected to a dust guide pipe 309, with the bottom end of the dust guide pipe 309 being open. A first rotating rod 310 is rotatably connected inside the connecting pipe 203.

[0026] Furthermore, driven by the conveying motor 200, the conveying screw 204 achieves stable material conveying. Through the meshing transmission of the first gear 205 and the second gear 206, the inclined plate 207 and the conveying scraper 209 are driven to reciprocate and push the material, effectively avoiding problems such as agglomeration, bridging, and uneven feeding of graphite raw materials. With the adaptive adjustment of the telescopic rod 211 and the spring 212, the material enters the subsequent screening unit in a uniform state, ensuring stable purification conditions from the source, protecting the morphology of spherical graphite particles from damage, and improving the utilization rate of raw materials and the pretreatment effect.

[0027] The stirring and filtering mechanism 4 includes a second fixed frame 401 fixedly connected to the upper surface of the main support frame 1. A rotating shaft 402 is rotatably connected inside the second fixed frame 401. A first connecting gear 403 and a second connecting gear 404 are fixedly connected to the outer surface of the rotating shaft 402. A ring gear 405 is fixedly connected to the front end of the rolling filter screen 7. A rotating motor 406 is fixedly connected inside the second fixed frame 401. A second rotating rod 407 is fixedly connected to the output shaft of the rotating motor 406. A driving gear 408 is fixedly connected to the outer surface of the second rotating rod 407. A driven gear 409 is fixedly connected to the outer surface of the first rotating rod 310.

[0028] Furthermore, by setting up a stirring and filtering mechanism 4, driven by a rotating motor 406, and through the stable transmission of a drive gear 408, a first connecting gear 403, a second connecting gear 404, and a ring gear 405, a uniform and reliable rotational power is provided to the rolling filter screen 7, ensuring a stable rotational speed during the gradient screening process. At the same time, through the driven gear 409, the first rotating rod 310, the blower 311, and the dispersing rod 312 are linked to move synchronously, further assisting in the dispersal of the material, making the material screening more uniform. Meanwhile, the rotating blower 311 guides the dust raised inside, significantly improving the grading accuracy and the stability of the device operation.

[0029] The recycling mechanism 5 includes a circulation pipe 501 fixedly connected to one side of the main support frame 1. A connecting material pipe 502 is fixedly connected to the upper end of the circulation pipe 501. A connecting transmission rack 503 is rotatably connected inside the circulation pipe 501. A fourth gear 504 is fixedly connected to the outer surface of the connecting transmission rack 503. A double-layer transmission belt 505 is rotatably connected inside the circulation pipe 501. A limiting rotating rod 506 is rotatably connected inside the circulation pipe 501. A conveying block 507 is fixedly connected to the upper surface of the double-layer transmission belt 505. A ring gear 405 meshes with a second connecting gear 404. A first connecting gear 403 meshes with a driving gear 408. A driving gear 408 meshes with a driven gear 409. A fourth gear 504 meshes with a ring gear 306. The connecting transmission rack 503 and the limiting rotating rod 506 are rotatably connected inside the double-layer transmission belt 505.

[0030] Furthermore, by setting up a recycling mechanism 5, the annular teeth 306 of the rolling filter screen 7 are linked to the fourth gear 504, driving the connecting transmission rack 503 and the double-layer transmission belt 505 to rotate. The conveyor block 507 automatically sends the substandard particles back into the rolling filter screen 7 for further screening, forming a closed-loop multi-stage fine purification process. This avoids the outflow of unqualified materials and effectively improves the purity and product qualification rate of the graphite product. At the same time, it reduces material waste, realizes continuous cyclic operation, and greatly improves the overall production efficiency.

[0031] A multi-stage fine purification method for high-purity spherical graphite includes the following steps: S1: The raw material enters the device through the dispersing and conveying mechanism 2. The conveying motor 200 drives the conveying screw 204 to rotate and convey the material. The first gear 205 and the second gear 206 mesh to drive the inclined plate 207 to move. When the inclined plate 207 moves, it pushes the spring 212 to contract, thereby causing the pulling rod 208 to drive the conveying scraper 209 to move backward. When the conveying scraper 209 moves back and forth, it disperses and pushes the material. The telescopic rod 211 and the spring 212 adaptively adjust the pushing pressure and reset, so that the material is evenly fed into the rolling filter screen 7 to complete the pre-treatment conveying.

[0032] S2: The rotating motor 406 drives the rolling filter screen 7 to rotate via the second rotating rod 407, the driving gear 408, the first connecting gear 403, the rotating shaft 402, the second connecting gear 404, and the ring gear 405. The filter holes on the rolling filter screen 7 gradually decrease in size from left to right to achieve gradient screening. The ring gear 306 drives the third gear 305 to rotate, which is linked by the transmission belt 307 to the cleaning brush 303 and the vibrating tapping shaft 304 to move synchronously. Together with the air blowing chamber 301 and the air blowing pump 302, air is blown downward to clean the impurities in the mesh. Fine dust is collected through the dust guide pipe 309 and the dust inlet 308.

[0033] S3: Substandard particles enter the recycling mechanism 5. The rotating rolling filter screen 7 drives the fourth gear 504 to rotate through the ring tooth 306. The rotating fourth gear 504 drives the connecting transmission rack 503 to rotate. The connecting transmission rack 503 drives the double-layer transmission belt 505 to rotate. The material is sent back to the rolling filter screen 7 for screening again through the double-layer transmission belt 505 and the conveying block 507. Qualified products are discharged through the multi-stage discharge port 8, completing the closed-loop multi-stage fine purification.

[0034] Working principle: Raw materials enter the device via the dispersing and conveying mechanism 2. The conveying motor 200 drives the conveying screw 204 to convey the material. The first gear 205 and the second gear 206 mesh to drive the inclined plate 207 to move, which in turn drives the spring 212 to extend and retract, causing the pulling rod 208 to drive the conveying scraper 209 to move back and forth, thereby achieving material dispersal and uniform feeding. After the material enters the rolling filter screen 7, the rotating motor 406 drives the rolling filter screen 7 to rotate through the second rotating rod 407, the driving gear 408, the first connecting gear 403, the rotating shaft 402, the second connecting gear 404, and the ring gear 405. Gradient screening is completed by using the gradually decreasing filter holes of the rolling filter screen 7 from left to right. When the rotating filter screen 7 rotates, it drives the third gear 305 and the transmission belt 307 through the ring gear 306, which in turn drives the cleaning brush 303 and the vibrating tapping shaft 304 to move synchronously. Together with the air blowing chamber 301 and the air blowing pump 302, it blows air downward to clean the impurities in the mesh. Fine dust is collected through the dust guide pipe 309 and the dust inlet 308. Unqualified particles enter the recycling mechanism 5. The rotating filter screen 7 drives the fourth gear 504, the connecting transmission gear 503, and the double-layer transmission belt 505 through the ring gear 306. The material is sent back to the rotating filter screen 7 by the conveying block 507 for screening again. Qualified products are discharged through the multi-stage discharge port 8, completing the whole closed-loop multi-stage fine purification process.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A multi-stage fine purification device for high-purity spherical graphite, comprising a main support frame (1), characterized in that: The upper surface of the main support frame (1) is provided with a dispersing and conveying mechanism (2) for conveying and dispersing graphite. The main support frame (1) is fixedly connected to an outer shell (6). The outer shell (6) is rotatably connected to a rolling filter screen (7). The upper end of the outer shell (6) is provided with a cleaning and dust collection mechanism (3) for cleaning the rolling filter screen (7) and screening and collecting internal dust. The front end of the main support frame (1) is provided with a stirring and filtering mechanism (4) for rotating the rolling filter screen (7). The rear end of the main support frame (1) is provided with a recycling and recovery mechanism (5) for circulating screening of graphite.

2. The high-purity spherical graphite multi-stage fine purification device according to claim 1, characterized in that: The cleaning and vacuuming mechanism (3) includes an air chamber (301) fixedly connected to the upper surface of the outer shell (6). An air pump (302) is fixedly connected to the side surface of the air chamber (301). A cleaning brush (303) and a vibrating tapping shaft (304) are rotatably connected inside the air chamber (301). A third gear (305) is fixedly connected to the outer surface of the cleaning brush (303). A ring tooth (306) is fixedly connected to the outer surface of the rolling filter screen (7). A transmission belt (307) is driven to the outer surface of the cleaning brush (303). A multi-stage discharge port (8) is fixedly connected to the bottom of the outer shell (6).

3. The high-purity spherical graphite multi-stage fine purification device according to claim 2, characterized in that: The rear end of the main support frame (1) is fixedly connected to a closed head (9), the outer side of the closed head (9) is fixedly connected to a dust inlet (308), the inside of the closed head (9) is fixedly connected to a dust guide pipe (309), the inside of the dust inlet (308) is rotatably connected to a first rotating rod (310), and the outer surface of the first rotating rod (310) is fixedly connected to a blower (311) and a dispersing rod (312).

4. The high-purity spherical graphite multi-stage fine purification device according to claim 3, characterized in that: The dispersing and conveying mechanism (2) includes a conveying support frame (201) fixedly connected to the upper surface of the main support frame (1). A conveying trough (202) is fixedly connected inside the conveying support frame (201). A connecting pipe (203) is fixedly connected to the front end of the conveying trough (202). A conveying motor (200) is fixedly connected to the rear end of the conveying trough (202). A conveying screw (204) is fixedly connected to the output shaft of the conveying motor (200). A first gear (205) is fixedly connected to the outer surface of the conveying screw (204).

5. The high-purity spherical graphite multi-stage fine purification device according to claim 4, characterized in that: A second gear (206) is rotatably connected to the rear side of the conveying trough (202). A pusher plate (207) is fixedly connected to one side of the second gear (206). A pull rod (208) is slidably connected inside the conveying trough (202). A conveying scraper (209) is fixedly connected inside the pull rod (208). A pusher block (210) is fixedly connected to one end of the pull rod (208). A telescopic rod (211) is fixedly connected to one side of the pusher block (210). A spring (212) is sleeved on the outer surface of the telescopic rod (211). A first fixing frame (213) is fixedly connected to the rear side of the conveying trough (202).

6. The high-purity spherical graphite multi-stage fine purification device according to claim 5, characterized in that: The stirring and filtering mechanism (4) includes a second fixed frame (401) fixedly connected to the upper surface of the main support frame (1). A rotating shaft (402) is rotatably connected inside the second fixed frame (401). A first connecting gear (403) and a second connecting gear (404) are fixedly connected to the outer surface of the rotating shaft (402). A ring gear (405) is fixedly connected to the front end of the rolling filter screen (7). A rotating motor (406) is fixedly connected inside the second fixed frame (401). A second rotating rod (407) is fixedly connected to the output shaft of the rotating motor (406). A driving gear (408) is fixedly connected to the outer surface of the second rotating rod (407). A driven gear (409) is fixedly connected to the outer surface of the first rotating rod (310).

7. The high-purity spherical graphite multi-stage fine purification device according to claim 6, characterized in that: The recycling mechanism (5) includes a circulation pipe (501) fixedly connected to one side of the main support frame (1). A connecting material pipe (502) is fixedly connected to the upper end of the circulation pipe (501). A connecting transmission rack (503) is rotatably connected inside the circulation pipe (501). A fourth gear (504) is fixedly connected to the outer surface of the connecting transmission rack (503). A double-layer transmission belt (505) is rotatably connected inside the circulation pipe (501). A limit rotating rod (506) is rotatably connected inside the circulation pipe (501). A conveying block (507) is fixedly connected to the upper surface of the double-layer transmission belt (505).

8. The high-purity spherical graphite multi-stage fine purification device according to claim 7, characterized in that: The pushing inclined plate (207) is set on one side of the pushing block (210), the telescopic rod (211) is fixedly connected to one side of the first fixed frame (213), the first gear (205) is meshed with the second gear (206), the pushing block (210) and the first fixed frame (213) are fixedly connected through the telescopic rod (211), the conveying screw (204) is rotatably connected inside the conveying groove (202), the third gear (305) is meshed with the ring gear (306), the cleaning brush (303) and the vibrating tapping shaft (304) are connected by a transmission belt (307), the dust inlet (308) is connected to the dust guide pipe (309), the bottom end of the dust guide pipe (309) is open, and the first rotating rod (310) is rotatably connected inside the connecting pipe (203).

9. The high-purity spherical graphite multi-stage fine purification device according to claim 8, characterized in that: The ring gear (405) meshes with the second connecting gear (404), the first connecting gear (403) meshes with the driving gear (408), the driving gear (408) meshes with the driven gear (409), the fourth gear (504) meshes with the ring tooth (306), and the connecting transmission rack (503) and the limiting rotating rod (506) are connected inside the double-layer transmission belt (505).

10. A method for multi-stage fine purification of high-purity spherical graphite, applied to the multi-stage fine purification apparatus for high-purity spherical graphite as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: The raw material enters the device through the dispersing and conveying mechanism (2). The conveying motor (200) drives the conveying screw (204) to rotate and convey the material. The first gear (205) meshes with the second gear (206) to drive the inclined plate (207) to move. When the inclined plate (207) moves, the spring (212) contracts, thereby causing the pulling rod (208) to drive the conveying scraper (209) to move backward. When the conveying scraper (209) moves back and forth, it disperses and pushes the material. The telescopic rod (211) and the spring (212) adaptively adjust the pushing pressure and reset, so that the material is evenly fed into the rolling filter screen (7) to complete the pre-treatment conveying. S2: The rotating motor (406) drives the rolling filter screen (7) to rotate through the second rotating rod (407), the driving gear (408), the first connecting gear (403), the rotating shaft (402), the second connecting gear (404), and the ring gear (405). The filter holes on the rolling filter screen (7) gradually decrease in size from left to right to achieve gradient screening. The ring gear (306) drives the third gear (305) to rotate, which in turn drives the cleaning brush (303) and the vibrating tapping shaft (304) to move synchronously through the transmission belt (307). Together with the air blowing chamber (301) and the air blowing pump (302), air is blown downward to clean the impurities in the mesh. Fine dust is collected through the dust guide pipe (309) and the dust inlet (308). S3: Substandard particles enter the recycling mechanism (5). The rotating rolling filter screen (7) drives the fourth gear (504) to rotate through the ring tooth (306). The rotating fourth gear (504) drives the connecting transmission rack (503) to rotate. The connecting transmission rack (503) drives the double-layer transmission belt (505) to rotate. The material is sent back to the rolling filter screen (7) for screening again through the double-layer transmission belt (505) and the conveying block (507). Qualified products are discharged through the multi-stage discharge port (8) to complete the closed-loop multi-stage fine purification.

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