Wet high-precision particle classification device based on optimized rotor structure and classification method

Abstract

The application discloses wet high-precision particle grading equipment and grading method based on optimized rotor structure, belongs to the powder grading technical field, and includes an outer shell, a grading driving mechanism, a grading chamber and a grading rotating mechanism, the outer shell is vertically arranged, and a working space groove is arranged on the outer shell, the grading driving mechanism is arranged on the outer shell, the grading chamber is located in the working space groove of the outer shell and is connected to the grading driving mechanism, and the grading rotating mechanism is arranged in the grading chamber, the grading driving mechanism can drive the grading rotating mechanism to rotate in the grading chamber to perform grading work on particles. The application can realize high-precision grading of nano to submicron particles, effectively remove fine and coarse particles of a specific size, and has the capabilities of automatic operation and flexible adaptation to different materials and particle size distribution requirements.

Description

Technical Field

[0001] This invention belongs to the field of powder classification technology, and particularly relates to a wet high-precision particle classification device and classification method based on an optimized rotor structure. Background Technology

[0002] In the production of high-value-added products such as high-performance chemicals, electronic materials, and pharmaceutical materials, there are strict requirements for the particle size distribution of raw materials. Existing air classifiers have problems such as insufficient classification accuracy and inability to effectively remove particles of specific sizes, making it difficult to meet the needs of fine classification.

[0003] Currently available air classification equipment, such as traditional centrifugal classifiers and rotor classifiers, can classify particles to a certain extent. However, when processing particles in the nanometer to submicron range, the classification accuracy is limited, and multiple devices are usually connected in series or complex process combinations are needed to barely achieve the required classification effect. This results in large equipment footprint, high energy consumption, and complex operation.

[0004] Traditional centrifugal classifiers use equal-angle rotor blades, which leads to disordered particle trajectories in the classification chamber and a mixture of coarse and fine particles (particle size distribution span > 40%). Particle size control relies on manual adjustment of rotor speed, which cannot achieve real-time closed-loop control of particle size distribution function (e.g., D90 value fluctuation > ± 15%). High-speed rotors (> 6000 rpm) generate frictional heat, causing deformation of heat-sensitive material particles (e.g., polymer melting and adhesion).

[0005] However, existing grading equipment still has the following drawbacks in use: 1. The grading accuracy is low, which cannot meet the strict requirements for particle size distribution of high value-added products; 2. Simultaneous removal of both fine and coarse particles is not effective and usually requires multiple processes or equipment; 3. It cannot flexibly adapt to the requirements of different materials and particle size distributions; 4. The equipment has a low degree of automation, is complex to operate, and requires frequent manual intervention; 5. It has limitations when dealing with special high-density or low-density materials.

[0006] 6. Mechanical structural defects: The uniform angle design of the rotor blades causes overload of centrifugal force at the edges, resulting in an over-pulverization rate of outer peripheral particles >18%. 7. System limitations: A single device cannot simultaneously perform coarse particle removal (scalping) and fine particle separation (fine cutting). 8. Insufficient control precision: Temperature-sensitive materials (such as PLGA microspheres) experience particle size drift > ±2μm during continuous operation. Summary of the Invention

[0007] This invention provides a wet high-precision particle grading device and grading method based on an optimized rotor structure to solve the problems in the prior art.

[0008] The present invention adopts the following technical solution: a wet high-precision particle grading device based on an optimized rotor structure, comprising an outer shell, a grading drive mechanism, a grading chamber, and a grading rotation mechanism. The outer shell is vertically arranged and has a working space slot. The grading drive mechanism is disposed on the outer shell. The grading chamber is located in the working space slot of the outer shell and connected to the grading drive mechanism. The grading rotation mechanism is disposed in the grading chamber. The grading drive mechanism can drive the grading rotation mechanism to rotate in the grading chamber to perform particle grading.

[0009] Furthermore, the graded drive mechanism includes a high-speed motor, a large pulley, a small pulley, a belt, a bearing sleeve, and a main shaft. The high-speed motor is vertically fixed inside the housing. The large pulley is located on the main shaft of the high-speed motor. The bearing sleeve is connected to the top of the working space groove by several bolts. The bearing sleeve is provided with bearings spaced vertically. The lower bearing is provided with a shaft seal for connection. The upper part of the main shaft is connected to the two bearings. The small pulley is located on the top of the main shaft. The belt is sleeved on the large pulley and the small pulley.

[0010] Furthermore, the grading chamber is divided into an upper cylinder, a grading cylinder, and a lower cover plate. The upper cylinder is connected to the bottom of the bearing cylinder by several bolts. An upper quick-tight clamp is provided between the upper cylinder and the grading cylinder for connection. A lower quick-tight clamp is provided between the grading cylinder and the lower cover plate for connection. The main shaft passes through the upper cylinder and the grading cylinder and extends into the lower cover plate. A circular partition is provided between the lower cover plate and the grading cylinder. A grading groove is provided inside the grading cylinder.

[0011] Furthermore, the grading rotation mechanism includes an impeller and a grading wheel, the lower cover plate is provided with a stepped placement groove, the bottom of the main shaft is connected to the impeller and the grading wheel through a hollow shaft, the impeller and the grading wheel are arranged vertically and horizontally in the placement groove, and the hollow shaft is connected to the grading groove and the placement groove.

[0012] Furthermore, the grading wheel has several rotor blades with gradually changing inclination angles of 10°-20°.

[0013] Furthermore, the grading cylinder is provided with a cooling jacket, and the grading cylinder is provided with a jacket cooling water inlet and a jacket cooling water outlet that are connected to the cooling jacket.

[0014] Furthermore, the upper cylinder is provided with a gas purging port and a flushing water inlet.

[0015] Furthermore, the bottom of the lower cover plate is provided with a feed inlet connected to the placement groove, the bottom of the lower cover plate is provided with a coarse particle outlet connected to the placement groove, and the grading groove on the grading cylinder is provided with a fine particle outlet; a peristaltic pump one is connected to the feed inlet, and a peristaltic pump two is connected to the coarse particle outlet.

[0016] Furthermore, it also includes a chiller and a control cabinet. The chiller is connected to the jacket cooling water inlet and the jacket cooling water outlet via pipes; the control cabinet is connected to the gas purging port and the flushing water inlet via pipes.

[0017] A classification method for a wet high-precision particle classifier based on an optimized rotor structure, the classification method comprising the following steps: S1. Raw material preparation: Powder and liquid medium (ethanol is usually used as liquid medium) are put into a container and fully dispersed. The dispersion equipment is a stirrer, and the stirrer is running throughout the entire process. S2. Start the chiller and introduce cooling water into the cooling jacket; S3. Start the high-speed motor and wait for the equipment to reach the set speed; S4. The raw materials are fed into the grading equipment via a peristaltic pump for grading; S5. Coarse particles are discharged from the coarse particle outlet on the side and collected by peristaltic pump 2; S6. Fine particles are directly discharged and collected from the fine particle outlet on the side; S7. After the grading process is completed, flushing water is introduced to clean the equipment cavity; S8. After cleaning, purge gas is introduced to dry the equipment cavity; S9. Turn off the classifier and wait for it to stop; S10. After the shutdown is completed, turn off the chiller.

[0018] The above-described at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects: (i) The grading accuracy is significantly improved, enabling precise control of particle size distribution and meeting the stringent requirements of high value-added products for the quality of raw material particles; (ii) A single machine can simultaneously remove both fine and coarse particles, simplifying the process and reducing equipment investment and operating costs; (iii) It has a wide range of applications and can handle a variety of materials, from low-density functional polymers to high-density metals and metal oxides; (iv) It has a high degree of automation, enabling remote monitoring and unattended operation, thereby improving production efficiency and reducing labor costs; (v) The equipment has a compact structure, occupies a small area, and is easy to integrate into existing production lines. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 A three-dimensional structural cross-section of the present invention. Figure 1 ; Figure 4 A three-dimensional structural cross-section of the present invention. Figure 2 ; Figure 5 This is a front view of the present invention; Figure 6 This is a schematic diagram of the particle flow direction in this invention; Figure 7 This is a three-dimensional structural diagram of the grading wheel in this invention; Figure 8 This is a top view of the grading wheel in this invention; Figure 9 This is a top view of the impeller in this invention; Figure 10 This is a process flow diagram of the present invention.

[0020] Figure label: 1. Outer shell, 10. Working space slot, 2. Grading drive mechanism, 21. High-speed motor, 22. Large pulley, 23. Small pulley, 24. Belt, 25. Bearing cylinder, 26. Main shaft, 27. Bearing, 28. Shaft seal, 3. Grading chamber, 31. Upper cylinder, 31. Gas purging port, 311. Flushing water inlet, 312. Grading cylinder, 320. Grading tank, 321. Cooling jacket, 322. Jacket cooling water inlet, 323. Jacket cooling water outlet, 324. Fine particle outlet, 33. Lower cover plate, 331. Feed inlet, 332. Coarse particle outlet, 34. Upper quick-tightening clamp, 35. Lower quick-tightening clamp, 36. Circular partition, 37. Placement slot, 4. Grading rotation mechanism, 40. Hollow shaft, 41. Impeller, 42. Grading wheel, 43. Rotor blade, 5. Peristaltic pump one, 6. Peristaltic pump two, 7. Chiller, 8. Control cabinet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] The technical solutions of the wet high-precision particle classification equipment and classification method based on an optimized rotor structure, provided by various embodiments of the present invention, are described in detail below with reference to the accompanying drawings.

[0023] Reference Figures 1 to 10 As shown, this embodiment of the invention provides a wet high-precision particle grading device based on an optimized rotor structure, including a housing 1, a grading drive mechanism 2, a grading chamber 3, and a grading rotation mechanism 4. The housing 1 is vertically arranged and has a working space slot 10. The grading drive mechanism 2 is disposed on the housing 1. The grading chamber 3 is located in the working space slot 10 of the housing 1 and connected to the grading drive mechanism 2. The grading rotation mechanism 4 is disposed in the grading chamber 3. The grading drive mechanism 2 can drive the grading rotation mechanism 4 to rotate in the grading chamber 3 to perform particle grading.

[0024] Working principle of stand-alone equipment: S1. Start the chiller 7 and introduce cooling water into the cooling jacket 321; S2. Start the high-speed motor 21 and wait for the equipment to reach the set speed; S3. Material is introduced from the bottom feed port 331; S4. Coarse particles are discharged and collected from the coarse particle outlet 332 on the side; S5. Fine particles are discharged and collected from the fine particle outlet 324 on the side; When the raw material is fed into the classifier, some fluid enters the rotor through the space between the rotor blades 43. Fine particles are discharged from the machine through the hollow shaft 40. Simultaneously, coarse particles are discharged from the classifying rotor by centrifugal force. S6. After the grading process is completed, flushing water is introduced to clean the equipment cavity; S7. After cleaning, purge gas is introduced to dry the equipment cavity; S8. Turn off the classifier and wait for it to stop; S9. After the shutdown is completed, turn off the chiller 7.

[0025] Specifically, the graded drive mechanism 2 includes a high-speed motor 21, a large pulley 22, a small pulley 23, a belt 24, a bearing sleeve 25, and a main shaft 26. The high-speed motor 21 is vertically fixed inside the outer casing 1. The large pulley 22 is located on the main shaft of the high-speed motor 21. The bearing sleeve 25 is connected to the inner top of the working space groove 10 by several bolts. The bearing sleeve 25 is provided with bearings 27 arranged vertically and vertically. The lower bearing 27 is provided with a shaft seal 28 for connection. The upper part of the main shaft 26 is connected to the two bearings 27. The small pulley 23 is located on the top of the main shaft 26. The belt 24 is sleeved on the large pulley 22 and the small pulley 23.

[0026] After the high-speed motor 21 starts, the large pulley 22 on its main shaft 26 drives the small pulley 23 on the top of the main shaft 26 through the belt 24, thereby causing the main shaft 26 to rotate. The main shaft 26 is connected to the grading rotation mechanism 4, which drives the impeller 41 and grading wheel 42 in the grading chamber 3 to start working. The peristaltic pump 5 pumps the slurry mixed with particles from the feed port 331 into the placement tank 37 in the lower cover plate 33, and the grading process officially begins.

[0027] Specifically, the grading chamber 3 is divided into an upper cylinder 31, a grading cylinder 32, and a lower cover plate 33. The upper cylinder 31 is connected to the bottom of the bearing cylinder 25 by several bolts. An upper quick-tight clamp 34 is provided between the upper cylinder 31 and the grading cylinder 32 for connection. A lower quick-tight clamp 35 is provided between the grading cylinder 32 and the lower cover plate 33 for connection. The main shaft 26 passes through the upper cylinder 31 and the grading cylinder 32 and extends into the lower cover plate 33. A circular partition 36 is provided between the lower cover plate 33 and the grading cylinder 32. A grading groove 320 is provided inside the grading cylinder 32.

[0028] Specifically, the grading rotation mechanism 4 includes an impeller 41 and a grading wheel 42. The lower cover plate 33 is provided with a stepped placement groove 37. The bottom of the main shaft 26 is connected to the impeller 41 and the grading wheel 42 through a hollow shaft 40. The impeller 41 and the grading wheel 42 are arranged vertically and horizontally in the placement groove 37. The hollow shaft 40 is connected to the grading groove 320 and the placement groove 37.

[0029] Specifically, the grading wheel 42 has several rotor blades 43 with gradually changing inclination angles of 10°-20°. Preferably, the inclination angle is 18°.

[0030] Specifically, the upper cylinder 31 is provided with a gas purge port 311 and a flushing water inlet 312.

[0031] Specifically, the bottom of the lower cover plate 33 is provided with a feed inlet 331 that communicates with the placement groove 37, the bottom of the lower cover plate 33 is provided with a coarse particle outlet 332 that communicates with the placement groove 37, and the grading groove 320 on the grading cylinder 32 is provided with a fine particle outlet 324 that communicates with it; a peristaltic pump 5 is provided on the feed inlet 331, and a peristaltic pump 6 is provided on the coarse particle outlet 332.

[0032] It should be noted that the rotational speed of peristaltic pump 5 is greater than that of peristaltic pump 6 to create a pressure difference, so that the fine particles can be discharged and collected from the fine particle outlet 324.

[0033] After being classified by the classifier wheel 42, the coarse particles, being closer to the outer periphery of the classifier wheel 42, will be transported to the designated collection area from the coarse particle outlet 332 at the bottom of the lower cover plate 33 under the action of the peristaltic pump 6; while the fine particles will enter the classification tank 320 inside the classification cylinder 32 through the hollow shaft 40 with the fluid, and finally be discharged from the fine particle outlet 324 on the classification cylinder 32, completing the process of simultaneously outputting coarse and fine particle components in a single processing. With a dual-outlet diversion mechanism, coarse and fine particle components can be output simultaneously in a single processing run. Compared with traditional equipment that requires multiple steps or multiple devices to remove fine and coarse particles at the same time, this greatly simplifies the process, improves processing efficiency, and reduces equipment investment and operating costs.

[0034] Specifically, the classifying cylinder 32 is provided with a cooling jacket 321, and the classifying cylinder 32 is provided with a jacket cooling water inlet 322 and a jacket cooling water outlet 323 connected to the cooling jacket 321. It also includes a chiller 7 and a control cabinet 8. The chiller 7 is connected to the jacket cooling water inlet 322 and the jacket cooling water outlet 323 via pipes; the control cabinet 8 is connected to a gas purging port 311 and a flushing water inlet 312 via pipes.

[0035] The cooling jacket 321 inside the classifying cylinder 32 is connected to the chiller 7. The cooling water circulating through the jacket cooling water inlet 322 and the jacket cooling water outlet 323 can effectively remove the heat generated during the classification process, ensuring a stable temperature inside the classifying chamber 3 and preventing deformation of heat-sensitive material particles due to temperature changes. At the same time, advanced fluid flow analysis and control technology precisely controls the flow path and velocity distribution of the slurry within the classifier, ensuring accurate separation of particles in a suitable force field.

[0036] Within the placement tank 37, the impeller 41 rotates and agitates the slurry, causing the particles to disperse fully and move with the fluid. When the fluid carrying the particles reaches the classifier 42, the rotor blades 43 on the classifier 42, with a gradually changing inclination angle of 10° to 20°, play a crucial role. Under the action of multiple force fields, such as centrifugal force and fluid resistance generated by the high-speed rotation of the rotor, particles of different sizes will have different motion trajectories due to the difference in force.

[0037] Larger particles experience greater centrifugal force and tend to move towards the outer periphery of the classifier wheel 42; smaller particles, experiencing less force, are more easily carried by the fluid towards the inner side of the classifier wheel 42, thus achieving initial particle classification.

[0038] A classification method for a wet high-precision particle classifier based on an optimized rotor structure, the classification method comprising the following steps: S1. Raw material preparation: Powder and liquid medium (ethanol is usually used as liquid medium) are put into a container and fully dispersed. The dispersion equipment is a stirrer, and the stirrer is running throughout the entire process. S2. Start the chiller 7 and introduce cooling water into the cooling jacket 321. Set the water temperature in the cooling jacket 321 to 5℃. S3. Start the high-speed motor 21 and wait for the equipment to reach the set speed, which is 2500 rpm; S4. The raw material is fed into the grading equipment through peristaltic pump 5 for grading. At this time; S5. Coarse particles are discharged from the side coarse particle outlet 332 and collected by peristaltic pump 6 (if the proportion of fine particles in the raw material is large, the coarse particles that come out need to be returned for secondary classification to avoid the escape of fine particles). S6. Fine particles are directly discharged and collected from the fine particle outlet 324 on the side; S7. After the grading process is completed, flushing water is introduced to clean the equipment cavity; S8. After cleaning, purge gas is introduced to dry the equipment cavity; S9. Turn off the grading machine and wait for it to stop. Grading time is 10 minutes. S10. After the shutdown is completed, turn off the chiller 7.

[0039] It should be noted that the material preparation is as follows: 100g of spherical copper powder with a particle size of 0-10μm. Add 900ml of ethanol. Pour the powder and ethanol into a beaker and start stirring at 200rpm. The separation requirement is to remove particles smaller than 1μm.

[0040] This invention eliminates the centrifugal force gradient in the grading zone through an asymmetric rotor structure, achieving uniform particle size throughout the cavity (CV < 5%). A dual-outlet diversion mechanism is constructed to simultaneously output coarse and fine particulate components in a single processing step. Develop a multi-parameter self-tuning control system to maintain the stability of the target particle size (D50) (deviation < ±0.3μm); An integrated active temperature control module ensures the stability of the operating temperature of the thermosensitive material (ΔT < ±1℃).

[0041] It should also be noted that: 1. High-speed motor: provides a speed range of 0-15000rpm, serving as the power source.

[0042] 2. Transmission system: belt structure, drive pulley diameter 90, driven pulley diameter 75, transmission ratio 1:1.2.

[0043] 3. Cooling jacket: Cools the grading chamber, with a set temperature of 0-15℃.

[0044] 4. Grading wheel: Provides centrifugal force, causing coarse particles to move outwards and fine particles to be drawn into the middle of the rotor.

[0045] 5. Impeller: Provides the particles with the same rotational speed, ensuring that the particles are constantly subjected to the action of the centrifuge. The present invention is compared with the prior art as follows:

[0046] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A wet high-precision particle grading device based on an optimized rotor structure, comprising an outer shell (1), a grading drive mechanism (2), a grading chamber (3), and a grading rotation mechanism (4). The outer shell (1) is vertically arranged and has a working space slot (10). The grading drive mechanism (2) is arranged on the outer shell (1). The grading chamber (3) is located in the working space slot (10) of the outer shell (1) and connected to the grading drive mechanism (2). The grading rotation mechanism (4) is arranged in the grading chamber (3). The grading drive mechanism (2) can drive the grading rotation mechanism (4) to rotate in the grading chamber (3) to grade the particles. Its features are: The grading chamber (3) is divided into an upper cylinder (31), a grading cylinder (32) and a lower cover plate (33). A circular partition plate (36) is provided between the lower cover plate (33) and the grading cylinder (32). A grading groove (320) is provided inside the grading cylinder (32). The grading drive mechanism (2) includes a main shaft (26) that extends through the upper cylinder (31) and the grading cylinder (32) into the lower cover plate (33); The grading rotation mechanism (4) includes an impeller (41) and a grading wheel (42). The lower cover plate (33) is provided with a stepped placement groove (37). The bottom of the main shaft (26) is connected to the impeller (41) and the grading wheel (42) through a hollow shaft (40). The impeller (41) and the grading wheel (42) are arranged vertically and horizontally in the placement groove (37). The hollow shaft (40) is connected to the grading groove (320) and the placement groove (37). The grading wheel (42) has several rotor blades (43) with gradually changing inclination angles of 10°-20°.

2. The wet high-precision particle classifier based on an optimized rotor structure according to claim 1, characterized in that: The graded drive mechanism (2) also includes a high-speed motor (21), a large pulley (22), a small pulley (23), a belt (24), and a bearing sleeve (25). The high-speed motor (21) is vertically fixed inside the outer casing (1). The large pulley (22) is located on the main shaft of the high-speed motor (21). The bearing sleeve (25) is connected to the inner top of the working space groove (10) by several bolts. The bearing sleeve (25) is provided with bearings (27) arranged at intervals. The lower bearing (27) is provided with a shaft seal (28) for connection. The upper part of the main shaft (26) is connected to the two bearings (27). The small pulley (23) is located on the top of the main shaft (26). The belt (24) is sleeved on the large pulley (22) and the small pulley (23).

3. The wet high-precision particle classification equipment based on an optimized rotor structure according to claim 2, characterized in that: The upper cylinder (31) is connected to the bottom of the bearing cylinder (25) by several bolts. An upper quick-tight clamp (34) is provided between the upper cylinder (31) and the grading cylinder (32) for connection. A lower quick-tight clamp (35) is provided between the grading cylinder (32) and the lower cover plate (33) for connection.

4. The wet high-precision particle classifier based on an optimized rotor structure according to claim 1, characterized in that: The rotor blade (43) has a gradually changing tilt angle of 18°.

5. The wet high-precision particle classifier based on an optimized rotor structure according to claim 1, characterized in that: The grading cylinder (32) is provided with a cooling jacket (321), and the grading cylinder (32) is provided with a jacket cooling water inlet (322) and a jacket cooling water outlet (323) connected to the cooling jacket (321).

6. The wet high-precision particle classifier based on an optimized rotor structure according to claim 5, characterized in that: The upper cylinder (31) is provided with a gas purge port (311) and a flushing water inlet (312).

7. The wet high-precision particle classifier based on an optimized rotor structure according to claim 6, characterized in that: It also includes a chiller (7) and a control cabinet (8). The chiller (7) is connected to the jacket cooling water inlet (322) and the jacket cooling water outlet (323) via pipes. The control cabinet (8) is connected to the gas purging port (311) and the flushing water inlet (312) via pipes.

8. The wet high-precision particle classifier based on an optimized rotor structure according to claim 1, characterized in that: The bottom of the lower cover plate (33) is provided with a feed inlet (331) connected to the placement groove (37), and the bottom of the lower cover plate (33) is provided with a coarse particle outlet (332) connected to the placement groove (37). The grading groove (320) on the grading cylinder (32) is provided with a fine particle outlet (324). The feed inlet (331) is provided with a peristaltic pump one (5) connected to it, and the coarse particle outlet (332) is provided with a peristaltic pump two (6) connected to it.

9. The wet high-precision particle classifier based on an optimized rotor structure according to claim 8, characterized in that: The rotational speed of the first peristaltic pump (5) is greater than that of the second peristaltic pump (6) to create a pressure difference between the feed inlet (331) and the coarse particle outlet (332), so that fine particles can be discharged from the fine particle outlet (324) and collected.

10. A classification method using a wet high-precision particle classification device based on an optimized rotor structure as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Raw material preparation: Powder and liquid media are added into a container and fully dispersed. The dispersion equipment is a mixer, and the mixer is running throughout the entire process. S2. Start the chiller (7) and introduce cooling water into the cooling jacket (321); S3. Start the high-speed motor (21) and wait for the equipment to reach the set speed; S4. The raw material is fed into the grading equipment by a peristaltic pump (5) for grading; S5. Coarse particles are discharged from the coarse particle outlet (332) on the side and collected by peristaltic pump two (6). When the proportion of fine particles in the raw material is large, the discharged coarse particles are returned for secondary classification to prevent fine particles from escaping. S6. Fine particles are directly discharged and collected from the fine particle outlet (324) on the side; S7. After the grading process is completed, flushing water is introduced to clean the equipment cavity; S8. After cleaning, purge gas is introduced to dry the equipment cavity; S9. Turn off the classifier and wait for it to stop; S10. After the shutdown is completed, turn off the chiller (7).

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