Dynamic multi-stage grinding device

Abstract

The utility model relates to a dynamic multistage grinding device which comprises a main shaft and a shell, the outer end of the main shaft is fixedly connected with a grinding roller, the inner wall of the shell is fixedly connected with an upper screen seat, the main shaft penetrates through the upper screen seat and is rotationally connected with the upper screen seat, and a plurality of screen holes are formed in the surface of the upper screen seat. A plurality of screen holes are distributed around the axis of the upper screen seat in a circumferential array mode, stepped holes are formed in the positions, corresponding to the screen holes, of the bottom of the upper screen seat, and variable-diameter assemblies are embedded in the inner walls of the stepped holes, so that real-time dynamic adjustment of the grinding gap between the lower mill and the upper mill is achieved through the structure, and it is guaranteed that the grinding granularity reaches the expected standard; the control system monitors the material granularity in real time through ultrasonic pulses, automatically adjusts grinding parameters, achieves intelligent adjustment, causes tiny vibration among grain particles through ultrasonic waves, improves the grinding uniformity, reduces the clamping stagnation phenomenon, keeps the grinding face clean, and further improves the grain grinding efficiency and quality.

Description

Technical Field

[0001] The utility model relates to a dynamic multi-stage grinding device, in particular to a dynamic multi-stage grinding device applied in the technical field of grinding devices. Background Art

[0002] In the modern grain processing industry, especially in the grain grinding process, the grinding process is a crucial process. The grinding process usually involves crushing, screening and grading the grains through a series of mechanical devices. However, in this process, some technical difficulties are often encountered. These problems not only affect the quality of the workpiece, but also increase production costs and reduce production efficiency.

[0003] The specification of Chinese utility model patent CN 220405818 U discloses a grain grinding device. By setting a feeding barrel structure with a turntable on the top of the feeding port, it solves the problem of traditional grinding equipment requiring repeated manual feeding, realizes sustainable feeding of materials, makes the feeding process more convenient and quick, avoids blockage caused by material accumulation at the feeding port, simplifies the operation process, and improves the practicality and reliability of the equipment.

[0004] Chinese utility model patent CN 220610550 U discloses a grain grinding device. By providing a movable motor, a slave gear, a master gear, a threaded shaft, a support pad, a push handle, a base plate, and a limiting block, the device overcomes the problem of grinding devices being bulky and difficult to move, thereby providing excellent mobility. Furthermore, by arranging a vibration motor, a screen, a debris opening, a grain box, a sliding sleeve A, a rod A, a spring A, a sliding sleeve B, a rod B, and a spring B, the device achieves effective screening and unified collection of ground grain and debris, avoiding the difficulty of separating unevenly distributed debris and improving the practicality and efficiency of the grinding device.

[0005] Although the above design has solved the problems of difficulty in adding materials, blockage of the feeding port, and difficulty in separating debris during grain grinding to a certain extent, it still has certain limitations, such as low grinding efficiency, uncontrolled particle size, inability to dynamically adjust grinding parameters in real time, and low grinding quality. Utility Model Content

[0006] In view of the above-mentioned existing technologies, the technical problem to be solved by the present invention is to improve the quality and efficiency of grain grinding through structural designs such as dynamic adjustment of grinding gap, multi-stage grinding, particle size detection and control, and ultrasonic-assisted grinding.

[0007] In order to solve the above problems, the present invention provides a dynamic multi-stage grinding device, including a main shaft and a shell, the outer end of the main shaft is fixedly connected to a grinding roller, the inner wall of the shell is fixedly connected to an upper screen seat, and the main shaft passes through the upper screen seat and is rotatably connected to the upper screen seat, a plurality of sieve holes are opened on the surface of the upper screen seat, and the plurality of sieve holes are distributed in a circular array around the axis of the upper screen seat, the bottom of the upper screen seat is provided with stepped holes at positions corresponding to the plurality of sieve holes, and a diameter-changing component is embedded in the inner wall of the stepped hole, and the diameter-changing component includes a plurality of stacked fan-shaped piezoelectric Ceramic, and multiple groups of stacked fan-shaped piezoelectric ceramics are distributed in a circular array around the axis of the stepped hole, the fan-shaped piezoelectric ceramics are electrically connected to the control system through a wire, the inner wall of the fan-shaped piezoelectric ceramics is provided with multiple symmetrically arranged arc plates, and a group of fan-shaped piezoelectric ceramics located at the top of the arc plate is fixedly connected to the outer wall of the arc plate, and the remaining groups of fan-shaped piezoelectric ceramics are in contact with the outer wall of the arc plate, the bottom end of the upper screen seat is in contact with the lower screen seat, the lower screen seat has the same structure as the upper screen seat, and the lower part of the variable diameter assembly is embedded in the lower screen seat;

[0008] The bottom of the shell is fixedly connected to a base plate, and the top of the base plate is fixedly connected to multiple groups of stacked piezoelectric ceramic rings. The piezoelectric ceramic rings are distributed in a circular array around the axis of the base plate. The piezoelectric ceramic rings are electrically connected to the control system through wires. Half of the multiple groups of piezoelectric ceramic rings are used to transmit ultrasonic waves and the other half are used to receive reflected ultrasonic waves. The transmitting and receiving piezoelectric ceramic rings are arranged crosswise.

[0009] As a further improvement of the present application, the outer wall of the main shaft is rotatably connected to a lower roller, the lower roller is fixedly connected to multiple groups of piezoelectric ceramic rings, and the lower roller is slidably connected to the inner wall of the shell.

[0010] As a further improvement of the present application, the outer end of the main shaft is fixedly connected to the upper roller via a connecting block, the upper roller is rotatably connected to the inner wall of the shell, and a conical cavity is opened inside the upper roller.

[0011] As a further improvement of the present application, an upper cover is fixedly connected to the top of the shell, a through hole is provided at the top of the upper cover, a feed hopper is fixedly connected to the top of the upper cover, and the feed hopper is communicated with the shell.

[0012] As another improvement of the present application, a plurality of rectangular notches are provided at the outer end of the shell, and the plurality of rectangular notches are evenly distributed along the circumference of the shell, and the positions of the shell corresponding to the rectangular notches are fixedly connected to a discharge hopper.

[0013] As another improvement of the present application, a scraper is fixedly connected to the outer end of the main shaft, and the scraper contacts the bottom surface of the lower screen seat, the bottom end of the main shaft is fixedly connected to the motor, the main shaft passes through the base plate, and is rotatably connected to the base plate, and the bottom end of the shell is fixedly connected to the frame.

[0014] As another improved supplement to the present application, the thickness of the fan-shaped piezoelectric ceramic is between 0.1 mm and 0.5 mm, preferably 0.3 mm. The fan-shaped piezoelectric ceramic is made of lead zirconate titanate material. The outer dimensions of the fan-shaped piezoelectric ceramic are fan-shaped. The outer surface of the fan-shaped piezoelectric ceramic is coated with a protective coating. The protective coating is made of polyimide material with a thickness of 0.075 mm.

[0015] As another improved supplement to the present application, the piezoelectric ceramic ring is composed of a plurality of layers of piezoelectric ceramic sheets, the thickness of each layer of piezoelectric ceramic sheets is between 0.3 mm and 0.5 mm, preferably 0.4 mm, the piezoelectric ceramic ring is made of lead zirconate titanate material, and an annular electrode is provided on the side of the piezoelectric ceramic ring.

[0016] In summary, this solution has the following beneficial effects:

[0017] 1. Dynamic adjustment of the grinding gap: By adjusting the position of the piezoelectric ceramic ring through the control system, the grinding gap between the lower roller and the upper roller can be dynamically adjusted in real time. Dynamic adjustment of the grinding gap allows the device to adjust the grinding parameters in real time according to actual needs to ensure that the grinding particle size meets the expected standards. Dynamic adjustment of the grinding gap can reduce ineffective grinding, improve grinding efficiency, and reduce energy consumption. The dynamic adjustment capability enables the device to adapt to the needs of different materials and improve the flexibility and adaptability of the equipment.

[0018] 2. Multi-stage grinding: The device adopts a multi-stage grinding method, including the first-stage roller crushing and the second-stage grinding. The multi-stage grinding can ensure the gradual refinement of the material and improve the uniformity and consistency of the final product. Through the initial crushing, the pressure of the second-stage grinding is reduced, making the second-stage grinding more efficient. The multi-stage grinding can better control the particle size of the final product and improve the quality of the product.

[0019] 3. Particle size detection: The control system transmits ultrasonic pulses through multiple groups of piezoelectric ceramic rings and receives reflected signals to monitor the material particle size in real time and perform intelligent control. Ultrasonic detection technology can provide real-time feedback on changes in the material's particle size to ensure the accuracy of particle size control. The control system automatically adjusts grinding parameters such as grinding gap and sieve hole size based on the detection results to achieve intelligent adjustment. The automated detection and control system reduces the need for manual operation and improves the convenience and reliability of operation.

[0020] 4. Particle size control: The control system monitors the average particle size of the grains during the secondary grinding in real time, and adjusts the aperture size during the primary roller pressing accordingly. Real-time monitoring and adjustment of the particle size enable the device to achieve higher-precision particle size control, ensuring consistent particle size of the final product. By adjusting the aperture size during the primary roller pressing, it can be ensured that the particles entering the secondary grinding have reached a certain degree of refinement, thereby reducing the pressure of the secondary grinding and improving the overall grinding efficiency.

[0021] 5. Ultrasonic-assisted grinding: Ultrasonic waves can be used to monitor and assist the grinding process in real time. Ultrasonic waves can cause tiny vibrations between grain particles, which helps to disperse the particles and reduce the aggregation between particles, thereby improving the uniformity of grinding. The tiny vibrations help to remove adhesions on the rolling surface, keep the rolling surface clean, improve grinding efficiency, and help reduce the phenomenon of material stagnation during the grinding process, thereby improving the smoothness of grinding.

[0022] 6. Cleaning and maintenance: The scraper contacts the bottom surface of the lower screen seat to effectively scrape off the material adhering to the screen surface. The scraper design reduces the probability of screen hole clogging and ensures the consistency of the screening effect. The scraper design makes the equipment easier to maintain and clean, extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the first partial view of this application;

[0024] Figure 2 This is the second partial view of this application;

[0025] Figure 3 This is an exploded view of the reducer assembly of this application;

[0026] Figure 4 This is the fourth partial view of this application;

[0027] Figure 5 This is the front view of the application;

[0028] Figure 6 It is the AA cross-sectional view of this application;

[0029] Figure 7 This is the BB cross-sectional view of this application;

[0030] Figure 8 This is the CC cross-sectional view of this application;

[0031] Figure 9 This is a schematic diagram of the overall structure of this application.

[0032] Description of the numbers in the figure:

[0033] 1. Spindle; 2. Housing; 3. Roller; 4. Upper screen seat; 5. Sieve hole; 6. Step hole; 7. Variable diameter assembly; 8. Sector piezoelectric ceramic; 9. Arc plate; 10. Lower screen seat; 11. Bottom plate; 12. Piezoelectric ceramic ring; 13. Lower roller; 14. Upper roller; 15. Conical cavity; 16. Upper cover; 17. Feed hopper; 18. Discharge hopper; 19. Scraper; 20. Motor; 21. Frame. DETAILED DESCRIPTION

[0034] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0035] The first implementation method:

[0036] Figure 1-9 A dynamic multi-stage grinding device is shown:

[0037] The main shaft 1 is the core transmission component of the entire device, which is used to transmit power and drive the rolling roller 3, scraper 19 and upper roller 14 to rotate. The stable rotation of the main shaft 1 ensures the continuity and efficiency of the grinding process. The shell 2 provides structural support and a closed environment for the device, protecting the internal components from the influence of the external environment, ensuring that the material will not leak during the grinding process, and improving the safety of operation. The rolling roller 3 is fixedly connected to the outer end of the main shaft 1 and is used to perform preliminary crushing on the incoming grains. The rotation of the rolling roller 3 can initially crush the grains, reduce the difficulty of subsequent grinding, and improve the grinding efficiency. The upper screen seat 4 is fixedly connected to the shell 2, the sieve holes 5 are distributed in a circular array around the axis of the upper sieve seat 4, the upper sieve seat 4 and the lower sieve seat 10 cooperate to fix the variable diameter component 7, the stepped hole 6 is located at the bottom of the upper sieve seat 4, corresponding to the position of the sieve hole 5, providing an installation position for the variable diameter component 7 to ensure that the aperture size can be dynamically adjusted. The variable diameter component 7 includes multiple groups of stacked fan-shaped piezoelectric ceramics 8, which change the aperture size through electrical control. The ability to dynamically adjust the aperture size enables the device to adapt to the needs of different materials, improve screening accuracy and efficiency, and ensure that the particles entering the secondary grinding have reached a certain degree of refinement, thereby reducing the pressure of the secondary grinding;

[0038] The fan-shaped piezoelectric ceramics 8 are distributed in a circular array around the axis of the stepped hole 6 and are connected to the control system through a wire. The movement of the arc plate 9 is driven by electric control to change the aperture size to ensure the consistency of the screening effect. The lower screen seat 10 has the same structure as the upper screen seat 4 and jointly fixes the variable diameter component 7. The bottom plate 11 is fixedly connected to the bottom of the shell 2 to support the piezoelectric ceramic ring 12. It provides an installation platform for the ultrasonic detection component to ensure the stability of the detection system. Multiple groups of piezoelectric ceramic rings 12 are stacked, half for emitting ultrasonic waves and the other half for receiving reflected ultrasonic waves. They are cross-arranged to detect the particle size of the material through ultrasonic waves, realize intelligent control, and improve grinding accuracy and efficiency.

[0039] Second implementation method:

[0040] Figure 1-9 A dynamic multi-stage grinding device is shown:

[0041] The lower roller 13 is fixedly connected to the multiple groups of piezoelectric ceramic rings 12 and is slidably connected to the inner wall of the housing 2. Since the lower roller 13 is fixedly connected to the multiple groups of piezoelectric ceramic rings 12, the position of the piezoelectric ceramic rings 12 is adjusted by the control system, so that the grinding gap between the lower roller 13 and the upper roller 14 can be dynamically adjusted in real time to grind the grain to the target particle size. The lower roller 13 is slidably connected to the inner wall of the housing 2, ensuring that the lower roller 13 can move smoothly in the vertical direction, thereby achieving precise adjustment of the grinding gap;

[0042] The upper roller 14 is rotatably connected to the inner wall of the shell 2, which ensures the freedom of the upper roller 14 during rotation, so that it can rotate smoothly under the drive of the main shaft 1 and perform effective grinding operations. The coordinated grinding between the upper roller 14 and the lower roller 13 is achieved by the relative rotation of the two. The design of the rotary connection ensures the reliability of this cooperation. The design of the conical cavity 15 allows the material to gradually concentrate along the guidance of the conical cavity 15 before entering the grinding gap between the upper roller 14 and the lower roller 13, thereby improving the uniformity of material distribution, helping to reduce the stuck phenomenon of the material when entering the grinding gap, and allowing the material to enter the grinding area smoothly. The conical cavity 15 helps to conduct preliminary guidance and concentration of the material before entering the grinding gap, so that the material can be more evenly distributed in the grinding area, thereby improving the grinding efficiency.

[0043] The through hole of the upper cover plate 16 provides an entrance for the material to enter the device, ensuring that the material can smoothly enter the grinding area. The design of the upper cover plate 16 helps to maintain the sealing of the device and reduce the leakage of dust during the grinding process. The design of the feed hopper 17 allows the material to enter the device conveniently, making it easy for the operator to add grain or other materials. The feed hopper 17 can be used to visually observe the entry of the material, facilitating timely adjustment of the feed amount.

[0044] The rectangular notches are evenly distributed along the circumference of the shell 2, so that the distribution of the discharge hopper 18 is more even, ensuring the uniformity of the material during discharge. The evenly distributed rectangular notches help to more easily find and clean the residual material during the cleaning process. The discharge hopper 18 is fixedly connected to the position of the shell 2 corresponding to the rectangular notch. The design of multiple discharge hoppers 18 allows the material to be discharged evenly from multiple positions, thereby improving the discharge efficiency. The design of multiple discharge ports reduces the risk of blockage of a single discharge port. Even if a discharge port is blocked, the other discharge ports can still operate normally.

[0045] The scraper 19 contacts the bottom surface of the lower screen seat 10, which can effectively scrape off the material adhering to the screen surface and prevent material accumulation. The continuous scraping of the scraper 19 ensures the cleanliness of the screen surface, improves the screening efficiency, and reduces the probability of screen hole clogging. The motor 20 provides power for the entire device, ensuring the stable rotation of the main shaft 1, thereby driving the grinding roller 3 and the upper roller 14 to perform the grinding operation. The frame 21 provides stable support for the entire device, ensuring the stability of the device during operation.

[0046] The fan-shaped piezoelectric ceramic 8 is preferably 0.3 mm thick so that the fan-shaped piezoelectric ceramic 8 has a high response speed and sensitivity, can quickly respond to the instructions of the control system, and realize dynamic adjustment of the aperture. The lead zirconate titanate PZT material has good piezoelectric effect and mechanical strength, and can withstand long-term electric field stress without failure. The fan-shaped design enables the piezoelectric ceramic to better adapt to the installation requirements in the stepped hole 6, ensuring that it can achieve maximum efficiency in a limited space. The protective coating made of polyimide material can effectively prevent the piezoelectric ceramic from being worn or corroded during use, thereby extending its service life.

[0047] The preferred 0.4 mm thickness of the piezoelectric ceramic ring 12 enables the piezoelectric ceramic ring 12 to have a high response speed and sensitivity, and can quickly respond to the instructions of the control system to achieve dynamic adjustment of the grinding gap. The design of the multi-layer piezoelectric ceramic sheet enables the piezoelectric ceramic ring 12 to achieve a larger displacement within a limited space, thereby improving its adjustment range. The design of the annular electrode enables the piezoelectric ceramic ring 12 to be more conveniently connected to the control system, facilitating the input and output of control signals and achieving precise grinding gap adjustment.

[0048] The third implementation method:

[0049] Figure 1-9 A dynamic multi-stage grinding device is shown:

[0050] The working principle of this scheme is as follows: when the grain needs to be ground, the grain is put into the feed hopper 17 during operation, and the grain enters the primary grinding stage through the feed hopper 17. The grain falls on the surface of the upper screen seat 4, and the control system starts the scraper 19. The output shaft of the scraper 19 drives the main shaft 1 to rotate, and the main shaft 1 drives the rolling roller 3 to rotate to roll the grain, and perform preliminary crushing of the grain. Pre-crushing can reduce the size of the grain particles, so that it is easier to be crushed into the required particle size when entering the grinding stage, shortening the grinding time and improving the grinding efficiency. While rolling, the grain flows out through the sieve hole 5 and the diameter-changing component 7, and is scraped and discharged into the conical cavity 15 on the upper roller 14 with the assistance of the scraper 19. Under the action of the roller pressure, the grain particles continue to flow downward, and the grain particles enter the grinding gap between the lower roller 13 and the upper roller 14 through the conical cavity 15. The lower roller 13 does not move, and the main shaft 1 drives the upper roller 14 to rotate, and the grain particles are secondary ground. After reaching the required particle size, they are discharged through the discharge hopper 18.

[0051] During the grinding process of the lower roller 13 and the upper roller 14, the control system emits multiple groups of piezoelectric ceramic rings 12 with ultrasonic pulses. These pulses pass through the grain particles between the lower roller 13 and the upper roller 14. The cross-arranged piezoelectric ceramic rings 12 receive the ultrasonic signals reflected from the grain particles. Particles of different particle sizes have different reflection characteristics, and the time delay, intensity and frequency of the reflected signals will change. The control system analyzes the received reflected signals, extracts the time delay, amplitude attenuation and other characteristics of the signals, and calculates the average particle size of the grain particles. The control system receives the average particle size information and compares it with the predicted The measured particle size is compared with the target particle size set. If the measured particle size does not match the target particle size, the distance that needs to be adjusted is calculated, and the control system supplies direct current to the multiple groups of piezoelectric ceramic rings 12. The piezoelectric ceramic rings 12 move axially under the influence of the voltage. The movement of the multiple groups of piezoelectric ceramic rings 12 drives the lower roller 13 to move, changing the distance between the lower roller 13 and the upper roller 14. After the adjustment is completed, at the next moment, the control system supplies alternating current to the multiple groups of piezoelectric ceramic rings 12 to generate ultrasonic pulses, and measures the average particle size of the grains again. The measurement stops when the target particle size is reached. If the target is still not reached, the above steps are repeated;

[0052] At the same time, ultrasound can assist in grinding. Ultrasonic waves can cause tiny vibrations between grain particles, which helps to disperse the particles and reduce the aggregation between particles, thereby improving the uniformity of grinding. At the same time, ultrasound also has a cleaning effect. Ultrasonic waves can generate tiny vibrations, which helps to remove adhesions on the rolling surface, thereby keeping the rolling surface clean and improving grinding efficiency.

[0053] The control system compares the average grain size measured during the secondary grinding process with the target particle size. When adjusting the distance between the lower roller 13 and the upper roller 14, the variable diameter assembly 7 is adjusted proportionally, thereby changing the particle size of the primary roller pressing. The control system applies direct current to multiple sets of sector-shaped piezoelectric ceramics 8, causing the stacked piezoelectric ceramics to move radially. The radial movement of the piezoelectric ceramics drives the movement of two symmetrically arranged arc plates 9, changing the aperture size. By monitoring the particle size of the secondary grinding process in real time and adjusting the aperture size during the primary roller pressing process accordingly, more precise particle size control can be achieved.

[0054] The system can quickly adjust the aperture size according to the actual particle size changes and can adapt to the production needs of different grains. By adjusting the aperture size during the first-level rolling, it can ensure that the particles entering the second-level grinding have reached a certain degree of refinement, thereby reducing the pressure of the second-level grinding and promoting the second-level grinding to complete the task faster, thereby improving the overall grinding efficiency. A more uniform particle distribution can improve the quality of the final product and ensure the consistency of particle size.

[0055] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A dynamic multi-stage grinding device, comprising a main shaft (1) and a housing (2), wherein the outer end of the main shaft (1) is fixedly connected to a grinding roller (3), characterized in that: The inner wall of the shell (2) is fixedly connected to the upper screen seat (4), and the main shaft (1) passes through the upper screen seat (4) and is rotatably connected to the upper screen seat (4). The surface of the upper screen seat (4) is provided with a plurality of screen holes (5), and the plurality of screen holes (5) are distributed in a circular array around the axis of the upper screen seat (4). The bottom of the upper screen seat (4) is provided with stepped holes (6) at positions corresponding to the plurality of screen holes (5). The inner wall of the stepped hole (6) is embedded with a variable diameter component (7), and the variable diameter component (7) includes a plurality of groups of stacked fan-shaped piezoelectric ceramics (8), and the plurality of stacked fan-shaped piezoelectric ceramics (8) are arranged around the stepped hole. The axes of the holes (6) are distributed in a circular array, the fan-shaped piezoelectric ceramics (8) are electrically connected to the control system through a wire, the inner wall of the fan-shaped piezoelectric ceramics (8) is provided with a plurality of symmetrically arranged arc plates (9), and a group of fan-shaped piezoelectric ceramics (8) located at the top of the arc plate (9) is fixedly connected to the outer wall of the arc plate (9), and the remaining groups of fan-shaped piezoelectric ceramics (8) are arranged in contact with the outer wall of the arc plate (9), the bottom end of the upper screen seat (4) is contacted with a lower screen seat (10), the lower screen seat (10) has the same structure as the upper screen seat (4), and the lower part of the variable diameter component (7) is embedded in the lower screen seat (10); The bottom of the shell (2) is fixedly connected to a base plate (11), and the top of the base plate (11) is fixedly connected to a plurality of stacked piezoelectric ceramic rings (12), the piezoelectric ceramic rings (12) are distributed in a circular array around the axis of the base plate (11), and the piezoelectric ceramic rings (12) are electrically connected to a control system through a wire. Half of the plurality of piezoelectric ceramic rings (12) are used to transmit ultrasonic waves and the other half are used to receive reflected ultrasonic waves, and the transmitting and receiving piezoelectric ceramic rings (12) are arranged crosswise.

2. A dynamic multi-stage grinding device according to claim 1, characterized in that: The outer wall of the main shaft (1) is rotatably connected to a lower roller (13), the lower roller (13) is fixedly connected to a plurality of groups of piezoelectric ceramic rings (12), and the lower roller (13) is slidably connected to the inner wall of the housing (2).

3. The dynamic multi-stage grinding device according to claim 1, characterized in that: The outer end of the main shaft (1) is fixedly connected to an upper roller (14) via a connecting block. The upper roller (14) is rotatably connected to the inner wall of the shell (2). A conical cavity (15) is provided inside the upper roller (14).

4. The dynamic multi-stage grinding device according to claim 1, characterized in that: The top end of the shell (2) is fixedly connected to an upper cover plate (16), a through hole is provided at the top end of the upper cover plate (16), a feed hopper (17) is fixedly connected to the top end of the upper cover plate (16), and the feed hopper (17) is in communication with the shell (2).

5. The dynamic multi-stage grinding device according to claim 1, characterized in that: The outer end of the shell (2) is provided with a plurality of rectangular notches, and the plurality of rectangular notches are evenly distributed along the circumference of the shell (2), and positions of the shell (2) corresponding to the rectangular notches are fixedly connected to a discharge hopper (18).

6. The dynamic multi-stage grinding device according to claim 1, characterized in that: The outer end of the main shaft (1) is fixedly connected to a scraper (19), and the scraper (19) contacts the bottom surface of the lower screen seat (10). The bottom end of the main shaft (1) is fixedly connected to a motor (20). The main shaft (1) passes through the bottom plate (11) and is rotatably connected to the bottom plate (11). The bottom end of the housing (2) is fixedly connected to a frame (21).

7. The dynamic multi-stage grinding device according to claim 1, characterized in that: The thickness of the fan-shaped piezoelectric ceramic (8) is between 0.1 mm and 0.5 mm. The fan-shaped piezoelectric ceramic (8) is made of lead zirconate titanate material. The outer dimensions of the fan-shaped piezoelectric ceramic (8) are fan-shaped. The outer surface of the fan-shaped piezoelectric ceramic (8) is coated with a protective coating. The protective coating is made of polyimide material and has a thickness of 0.075 mm.

8. The dynamic multi-stage grinding device according to claim 1, characterized in that: The piezoelectric ceramic ring (12) is composed of multiple layers of piezoelectric ceramic sheets, each layer of which has a thickness between 0.3 mm and 0.5 mm. The piezoelectric ceramic ring (12) is made of lead zirconate titanate material, and a ring electrode is provided on the side surface of the piezoelectric ceramic ring (12).

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