A low-frequency mechanical vibration and ultrasonic combined ball mill device

Abstract

The utility model discloses a kind of low-frequency mechanical vibration and ultrasonic collaborative composite ball mill device, including grinding jar and the driving device being set on grinding jar, it is characterized in that, the outside of the grinding jar is equipped with ultrasonic system and low-frequency mechanical vibration system;The ultrasonic system is at least set one group, and each group includes ultrasonic generator and ultrasonic transducer;The low-frequency mechanical vibration system is at least set one group, and each group includes vibration generator, gas pressure-reducing valve and solenoid valve.The utility model passes through ultrasonic system, applies ultrasonic to scatter material cluster, strengthens microcosmic mixing;Again through low-frequency mechanical vibration system, apply low-frequency mechanical vibration to strengthen macroscopic mixing while reducing the apparent viscosity of material, the synergistic effect of both, can significantly improve ball milling efficiency, especially suitable for the efficient grinding of high-viscosity material.

Description

Technical Field

[0001] This utility model relates to the field of grinding equipment technology, specifically to a composite ball milling device that combines low-frequency mechanical vibration and ultrasonic stimulation. Background Technology

[0002] Traditional ball milling technology faces a series of technical bottlenecks when processing high-precision, high-viscosity, or nanoscale materials. Specifically, during the grinding process, materials are prone to settling, clumping, sticking to the walls, and inter-particle aggregation, as well as excessive air bubbles. These problems directly lead to low grinding efficiency, uneven particle size distribution in the final product, and high energy consumption. Especially under conditions of high solids content or high material concentration, the viscosity of the slurry system increases sharply, severely restricting the impact and shearing efficiency of the grinding media, making the above problems even more prominent.

[0003] To overcome the aforementioned limitations, ultrasonic-assisted ball milling technology primarily utilizes the intense microjets, shock waves, and localized high pressure generated by ultrasonic cavitation to effectively disrupt van der Waals forces between particles, thereby preventing microscale particle agglomeration. For example, ultrasonic planetary ball mills, by generating high-frequency ultrasonic oscillations on the inner wall of the milling jar, can alleviate powder adhesion and agglomeration problems to some extent, improving material dispersibility. However, relying solely on ultrasonic technology has inherent limitations: for high-viscosity, high-solids-content slurry systems, ultrasonic energy attenuates significantly in viscous media, making it difficult for its cavitation effect to penetrate to the core region of the material, thus limiting its microscopic dispersion effect. This further leads to insufficient macroscopic flow field mixing capacity, failing to effectively reduce the apparent viscosity of the entire system and maintain good circulating flowability; resulting in low efficiency and easy particle agglomeration when processing high-viscosity materials. Summary of the Invention

[0004] Purpose of the utility model: The purpose of this utility model is to address the shortcomings of existing ball milling technology in processing high-viscosity materials, namely low efficiency and easy particle agglomeration, by providing a composite ball milling device that combines low-frequency mechanical vibration and ultrasound. The composite ball milling device described in this utility model can be applied to the grinding of solid-liquid mixtures or high-viscosity fluids in the fields of chemical engineering, biomedicine, and nanomaterials.

[0005] The technical solution for realizing this utility model is: This utility model discloses a composite ball milling device combining low-frequency mechanical vibration and ultrasound, comprising a grinding jar and a driving device mounted on the grinding jar for driving the grinding process. The grinding jar contains grinding media and material to be ground. An ultrasonic system and a low-frequency mechanical vibration system are provided on the outside of the grinding jar. The ultrasonic system is provided in at least one set, each set including an ultrasonic generator and an ultrasonic transducer. The ultrasonic generator and the ultrasonic transducer are electrically connected. The ultrasonic generator generates a high-frequency electrical signal, which is converted into high-frequency mechanical vibration, i.e., ultrasound, by the ultrasonic transducer. The ultrasonic transducer is fixed to the bottom outer wall of the stainless steel cavity by flange bolts, allowing the ultrasonic energy to penetrate the cavity wall of the grinding jar and act on the material inside the cavity. During the grinding process, the ultrasound generates a strong cavitation effect in the material, and the instantaneous shock wave can effectively break up the tiny agglomerates in the material.

[0006] The low-frequency mechanical vibration system is provided in at least one set, each set including a vibration generator, a gas pressure reducing valve, and a solenoid valve. The gas pressure reducing valve is connected to a compressed air source and electrically connected to the vibration generator. A solenoid valve is provided between the gas pressure reducing valve and the vibration generator. The vibration generator in this invention is preferably a pneumatic vibration generator, which works by generating high-frequency impacts through high-pressure gas, thereby applying strong, low-frequency mechanical macroscopic vibrations. This macroscopic vibration acts on the entire grinding jar, subjecting the high-viscosity material inside to low-frequency mechanical shear forces, thereby reducing its apparent viscosity, i.e., producing a shear thinning effect.

[0007] A preferred embodiment of this invention is that the grinding jar includes a stainless steel cavity, and the stainless steel cavity is provided with a circulation pipe that is in circulatory communication with the inside of the stainless steel cavity.

[0008] A preferred embodiment of this invention is that the circulation pipe is provided with a receiving tank, the bottom of which is connected to the circulation pipe, and the end of the circulation pipe located at the top of the receiving tank is provided with a discharge port.

[0009] A preferred embodiment of this invention is that a stainless steel filter screen is provided at the connection between the circulation pipe and the stainless steel cavity.

[0010] The preferred technical solution of this utility model is that the pore size of the stainless steel filter screen is smaller than the outer diameter of the grinding medium inside the stainless steel cavity, and the stainless steel filter screen is used to prevent the grinding medium from leaking outward.

[0011] The preferred technical solution of this utility model is that the outer wall of the stainless steel cavity is a jacket structure, and the jacket structure is provided with a water valve, which is connected to an external water circulation system. Through the setting of the external water circulation system and the water valve, external water enters the jacket structure and circulates. The heat exchange function of the jacket structure is used to regulate the temperature inside the stainless steel cavity, thereby realizing the temperature regulation of the grinding process.

[0012] The preferred technical solution of this utility model is that the driving device includes a motor and a stirring paddle. The driving device is used to drive the grinding media to grind the material. The motor drives the stirring paddle located inside the grinding tank to rotate, so that the grinding media rotates and thus produces a grinding effect on the grinding material. The motor is fixed to the outside of the grinding tank.

[0013] The preferred technical solution of this utility model is that the ultrasonic transducer and the vibration generator are arranged on different sides of the grinding jar; the vibration generator is anchored to the outer wall of the grinding jar by welding or clamping, and the ultrasonic transducer is fixed to the outer wall of the grinding jar at a different position from the vibration generator by flange bolts. This structural design enables the micro-force field generated by the ultrasonic system and the macro-force field generated by the low-frequency mechanical vibration system to couple with each other in the cavity of the grinding jar to form a composite force field.

[0014] The preferred technical solution of this utility model is that the vibration frequency of the low-frequency mechanical vibration system is 10Hz to 300Hz, and the vibration force generated is 600N-4000N. The macroscopic vibration in this frequency range is sufficient to cause the shear thinning effect of high viscosity slurry.

[0015] The preferred technical solution of this utility model is that the ultrasonic system generates ultrasonic waves with a frequency range of 20kHz to 100kHz; ultrasonic waves of this frequency have good cavitation effect and dispersion ability.

[0016] The preferred technical solution of this utility model is as follows: the ultrasonic system and the low-frequency mechanical vibration system are electrically connected to a controller. The controller controls the ultrasonic energy input frequency of the ultrasonic system and its instantaneous start and stop. The controller also controls the vibration frequency of the low-frequency mechanical vibration system and its instantaneous start and stop. The solenoid valve is installed in the air circuit and electrically connected to the controller. It is used to quickly open or close the high-pressure airflow to achieve instantaneous start and stop of the vibration generator. The controller of this utility model is a conventional PLC; there is no modification to the controller. The controller is used to independently or collaboratively control the instantaneous start and stop of the ultrasonic system and the low-frequency mechanical vibration system, as well as the ultrasonic energy input frequency of the ultrasonic system and the vibration frequency of the low-frequency mechanical vibration system.

[0017] Preferably, in the grinding process, the ultrasonic system and the low-frequency mechanical vibration system are alternately turned on and off in a cycle of 10-60 seconds to achieve partial overlap of the two systems. This alternation mode can prevent the formation of standing waves and improve the uniformity of grinding.

[0018] The working principle of this utility model is as follows: In operation, this invention first adds the material to be ground into the receiving tank; then, the drive device is started, causing the stirring paddle to run at a speed of 1000-1800 rpm. During this process, the material to be ground is circulated and ground in the conventional system via the grinding tank and circulation pipe. After the ball milling process stabilizes, for example, after running for 1 minute, the ultrasonic system is first started by the controller. After the ultrasonic system runs for 5-15 seconds, the low-frequency mechanical vibration system is started by opening the solenoid valve through the controller. The simultaneous start of the ultrasonic system and the low-frequency mechanical vibration system is called the reinforcement cycle. After the ultrasonic system and the low-frequency mechanical vibration system run simultaneously for 10-30 seconds, the controller closes the ultrasonic system and the solenoid valve, stopping the operation of the ultrasonic system and the low-frequency mechanical vibration system. Afterward, the composite ball milling device performs a conventional ball milling interval of 10-20 seconds, and then repeats the above reinforcement cycle until the grinding is completed. The ultrasonic system is responsible for breaking down micro-agglomerates and removing air bubbles, while the low-frequency mechanical vibration system is responsible for reducing macroscopic viscosity and enhancing material flowability. The synergistic effect of the ultrasonic system and the low-frequency mechanical vibration system enables the grinding media to move efficiently even in high-viscosity materials, continuously breaking down agglomerates of tiny particles, thereby significantly improving the overall efficiency of the ball mill.

[0019] By adopting the above technical solution, this utility model has the following beneficial effects: (1) The present invention simultaneously sets up an ultrasonic system and a low-frequency mechanical vibration system on the grinding tank. The ultrasonic system can effectively break up the agglomeration structure of the material through the cavitation effect of the ultrasonic waves acting on the grinding tank, and prevent powder adhesion and self-agglomeration. The low-frequency mechanical vibration effect can reduce the viscosity of the grinding material and enhance the flow and dispersion of the material. Under the synergistic effect of the dual mechanical forces, the grinding efficiency of high viscosity materials can be significantly improved, making the grinding particle size more uniform.

[0020] (2) This utility model can accurately control the start-up sequence of the ultrasonic system and the low-frequency mechanical vibration system through the controller; this utility model enables the operator to accurately adjust the energy input frequency and time allocation according to different material characteristics and grinding requirements through partial overlap of low-frequency vibration and ultrasonic vibration, and avoid energy waste; through the precise control of the ultrasonic system and the low-frequency mechanical vibration system, the optimal grinding process parameters can also be customized for specific materials, providing a flexible and variable operating platform for different grinding scenarios. Attached Figure Description

[0021] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic diagram of the composite ball mill device described in this utility model; In the diagram, 1-grinding jar, 11-circulation pipe, 12-receiving jar, 13-stainless steel filter screen, 14-stainless steel cavity, 15-water valve, 16-discharge port, 2-drive device, 21-stirring paddle, 22-motor, 3-ultrasonic system, 31-ultrasonic generator, 32-ultrasonic transducer, 4-low frequency mechanical vibration system, 41-vibration generator, 42-gas pressure reducing valve, 43-solenoid valve, 5-controller. Detailed Implementation

[0022] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings, but the protection scope of this utility model is not limited to the described embodiments.

[0023] Example: A composite ball milling device combining low-frequency mechanical vibration and ultrasound, such as... Figure 1 As shown, the composite ball mill device in this embodiment includes a grinding jar 1 and a driving device 2 disposed on the grinding jar 1 for driving grinding. The grinding jar 1 in this embodiment contains grinding media, which grinds the material in the grinding jar 1.

[0024] The grinding jar 1 includes a stainless steel cavity 14. The stainless steel cavity 14 is provided with a circulation pipe 11 that is in circulation with the inside of the stainless steel cavity 14. A drive device 2 is provided at one end of the stainless steel cavity 14, and a first through hole for installing the circulation pipe 11 is opened at the other end. A second through hole is opened at the top of the stainless steel cavity 14. One end of the circulation pipe 11 is connected to and fixed to the first through hole, and the other end of the circulation pipe 11 is connected to and fixed to the second through hole. A stainless steel filter screen 13 is provided at the connection between the circulation pipe 11 and the stainless steel cavity 14. The pore size of the stainless steel filter screen 13 is smaller than the outer diameter of the grinding media inside the stainless steel cavity 14. The stainless steel filter screen 13 is used to prevent the grinding media from leaking outward.

[0025] To achieve the desired grinding effect, a receiving tank 12 is installed on the circulation pipe 11 near the first through hole. The receiving tank 12 preferably has a tank structure with a top cross-section larger than its bottom cross-section. The bottom of the receiving tank 12 is connected to the circulation pipe 11. A discharge port 16 is located at the end of the circulation pipe 11 at the top of the receiving tank 12, directly facing the center of the top of the receiving tank 12, ensuring that the material passing through the discharge port 16 falls accurately into the receiving tank 12. During the grinding process, the material to be ground enters the stainless steel cavity 14 from the receiving tank 12 and is ground within the stainless steel cavity 14. The material then enters the circulation pipe 11 from the other end and re-enters the receiving tank 12 through the discharge port 16. Finally, it re-enters the stainless steel cavity 14 through the circulation pipe 11 at the bottom of the receiving tank 12, achieving material circulation grinding. The ground material is then removed from the grinding system through the discharge port 16, completing the grinding process.

[0026] The driving device 2 in this embodiment includes a motor 22 and a stirring paddle 21. The driving device 2 is used to drive the grinding media to grind the material. The motor 22 is fixed outside the grinding tank 1, and the stirring paddle 21 is disposed inside the grinding tank 1. In this embodiment, the motor 22 drives the stirring paddle 21 to rotate, so that the grinding media rotates, thereby producing a grinding effect on the grinding material.

[0027] In this embodiment, an ultrasonic system 3 and a low-frequency mechanical vibration system 4 are fixedly mounted on the outside of the grinding tank 1. The controller 5 is electrically connected to the ultrasonic system 3 and the low-frequency mechanical vibration system 4 respectively. The controller 5 is used to quickly turn the ultrasonic system 3 and the low-frequency mechanical vibration system 4 on or off. The controller 5 in this embodiment is a conventional PLC, and there is no improvement to the controller 5. A common PLC can achieve the control effect in this embodiment. The controller 5 is used to independently or collaboratively control the start-up time and energy input frequency of the ultrasonic system 3 and the low-frequency mechanical vibration system 4. The controller 5 in this embodiment can accurately control the start-up sequence of the ultrasonic system and the low-frequency mechanical vibration system. In this embodiment, by partially overlapping the low-frequency vibration and ultrasonic vibration, the operator can accurately adjust the energy input frequency and time allocation according to different material characteristics and grinding requirements, which can avoid energy waste. Through the precise control of the ultrasonic system and the low-frequency mechanical vibration system, the ball mill in this embodiment can also customize the optimal grinding process parameters for specific materials, providing a flexible and variable operating platform for different grinding scenarios.

[0028] In this embodiment, at least one set of ultrasonic system 3 is provided, each set including an ultrasonic generator 31 and an ultrasonic transducer 32. The ultrasonic generator 31 and the ultrasonic transducer 32 are electrically connected. The ultrasonic generator 31 is used to generate a high-frequency electrical signal, and the ultrasonic transducer 32 converts the electrical signal into a high-frequency mechanical vibration, i.e., ultrasonic waves. The ultrasonic system 3 generates ultrasonic waves with a frequency range of 20kHz to 100kHz. Ultrasonic waves of this frequency have good cavitation effect and dispersion ability. The ultrasonic transducer 32 is fixed to the bottom outer wall of the stainless steel cavity 14 by flange bolts, so that the ultrasonic energy can penetrate the cavity wall of the grinding tank 1 and act on the material in the cavity. During the grinding process, the ultrasonic waves generate a strong cavitation effect in the material, and the instantaneous shock wave can effectively disperse the small agglomerates in the material.

[0029] In this embodiment, at least one low-frequency mechanical vibration system 4 is provided. Each group includes a vibration generator 41, a gas pressure reducing valve 42, and a solenoid valve 43. The gas pressure reducing valve 42 is connected to a compressed air source and electrically connected to the vibration generator 41. A solenoid valve 43 is provided between the gas pressure reducing valve 42 and the vibration generator 41. The solenoid valve 43 is located in the air path and electrically connected to the controller 5, used to quickly open or close the high-pressure airflow, thereby realizing the instantaneous start and stop of the vibration generator 41. The working principle of the low-frequency mechanical vibration system in this embodiment is to generate high-frequency impact through high-pressure gas, thereby applying strong, low-frequency mechanical macroscopic vibration. The vibration frequency of the low-frequency mechanical vibration system 4 in this embodiment is preferably 10Hz to 300Hz, and the vibration force generated is 600N-4000N. Macroscopic vibration in this frequency range is sufficient to cause a shear thinning effect in high-viscosity slurry. The low-frequency mechanical vibration system 4 applies significant periodic shear force to the material to be ground through large-amplitude, low-frequency mechanical vibration, macroscopically destroying the structural strength of the material, causing the interlocking points between particles to break, and reducing the yield stress of the system, thereby significantly improving the initial fluidity of the slurry; this vibration energy also helps to promote full contact between the solid and liquid phases through convection, reducing the formation of local high-viscosity areas; this macroscopic vibration acts on the entire grinding tank 1, causing the high-viscosity material inside to receive low-frequency mechanical shear force, thereby reducing its apparent viscosity, i.e., producing a shear thinning effect.

[0030] In this embodiment, the vibration generator 41 is preferably a pneumatic vibration generator. The vibration generator 41 is anchored to the outer wall of the grinding jar 1 by welding or clamping. The ultrasonic transducer 32 is fixed to the outer wall of the grinding jar 1 on a different side from the vibration generator 41 by flange bolts. This structural design allows the microscopic force field generated by the ultrasonic system 3 and the macroscopic force field generated by the low-frequency mechanical vibration system 4 to couple with each other within the cavity of the grinding jar 1, forming a composite force field. In this embodiment, the ultrasonic transducer 32 and the vibration generator 41 are preferably located at different positions in the grinding jar 1.

[0031] In this embodiment, during the grinding process in the grinding tank 1, the preferred working scheme is to alternately turn the ultrasonic system 3 and the low-frequency mechanical vibration system 4 on and off with a cycle of 10-60 seconds. This alternating mode can effectively prevent the formation of standing waves and improve the uniformity of grinding.

[0032] In order to regulate the temperature of the stainless steel cavity 14, in this embodiment, the outer wall of the stainless steel cavity 14 is set as a jacket structure, and the jacket structure is provided with a water valve 15, which is connected to an external water circulation system. Through the setting of the external water circulation system and the water valve 15, external water enters the jacket structure and circulates. The heat exchange function of the jacket structure is used to regulate the temperature inside the stainless steel cavity 14, thereby achieving temperature regulation of the grinding process.

[0033] The composite ball milling device in this embodiment synergistically couples macroscopic vibrations of low-frequency mechanical vibrations with microscopic vibrations of ultrasonic waves, forming a complementary and enhanced technical solution. The macroscopic vibrations in this invention focus on reducing the overall viscosity of the system and enhancing macroscopic mixing; while the ultrasonic waves are primarily precise at the microscopic scale, breaking down agglomerates and eliminating air bubbles. This innovative "macro-micro" synergistic mechanism can simultaneously overcome both macroscopic flow obstacles and microscopic dispersion challenges in grinding high-viscosity materials, thereby achieving a significant improvement in ball milling efficiency.

[0034] The working principle of the composite ball mill device in this embodiment is as follows: In this embodiment, the composite ball mill device first adds the material to be ground into the receiving tank 12 during operation. Then, the drive device 2 is started, causing the stirring paddle 21 to run at a speed of 1000-1800 rpm. During this process, the material to be ground is circulated and ground in the conventional system via the grinding tank 1 and the circulation pipe 11. After the ball milling process stabilizes, for example, after running for 1 minute, the ultrasonic system 3 is started first by the controller 5. The ultrasonic vibration frequency of the ultrasonic system 3 is 20-40 kHz. After the ultrasonic system 3 runs for 5-15 seconds, the solenoid valve 43 is opened by the controller 5 to start the low-frequency mechanical vibration system 4. The air intake pressure of the ultrasonic system 3 is adjusted to 4-6 bar, corresponding to a vibration frequency of 20-40 Hz. The simultaneous start of the ultrasonic system 3 and the low-frequency mechanical vibration system 4 is called the reinforcement cycle. After the ultrasonic system 3 and the low-frequency mechanical vibration system 4 operate simultaneously for 10-30 seconds, the controller 5 shuts down the ultrasonic system 3 and the solenoid valve 43, stopping their operation. Subsequently, the composite ball mill operates for a standard ball milling interval of 10-20 seconds, then repeats the above-mentioned enhanced cycle until grinding is complete. The ultrasonic system 3 is responsible for breaking up micro-agglomerates and removing air bubbles, while the low-frequency mechanical vibration system 4 is responsible for reducing macroscopic viscosity and enhancing material flowability. The synergistic effect of the ultrasonic system 3 and the low-frequency mechanical vibration system 4 enables the grinding media to move efficiently even in high-viscosity materials, continuously breaking down agglomerates of small particles, thereby significantly improving the overall efficiency of the ball mill.

[0035] In this embodiment, an ultrasonic system 3 and a low-frequency mechanical vibration system 4 are simultaneously installed on the grinding tank 1. The ultrasonic system 3 can effectively break up the agglomeration structure of the material through the cavitation effect of the ultrasonic waves acting on the grinding tank 1, preventing powder adhesion and self-agglomeration. The low-frequency mechanical vibration effect can reduce the viscosity of the grinding material and enhance the flow and dispersion of the material. Under the synergistic effect of the dual mechanical forces, the grinding efficiency of high-viscosity materials can be significantly improved, resulting in a more uniform grinding particle size.

[0036] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A composite ball milling device combining low-frequency mechanical vibration and ultrasound, comprising a grinding jar and a drive device disposed on the grinding jar for driving the grinding process, characterized in that, An ultrasonic system and a low-frequency mechanical vibration system are fixed to the outside of the grinding jar; The ultrasonic system is provided in at least one set, each set including an ultrasonic generator and an ultrasonic transducer, the ultrasonic generator and the ultrasonic transducer being electrically connected; the low-frequency mechanical vibration system is provided in at least one set, each set including a vibration generator, a gas pressure reducing valve and a solenoid valve, the gas pressure reducing valve being connected to a compressed air source, the gas pressure reducing valve being electrically connected to the vibration generator, and a solenoid valve being provided between the gas pressure reducing valve and the vibration generator.

2. The composite ball mill apparatus according to claim 1, characterized in that, The ultrasonic transducer and the vibration generator are located on different sides of the grinding jar.

3. The composite ball mill apparatus according to claim 1, characterized in that, The grinding jar includes a stainless steel cavity, and the stainless steel cavity is provided with a circulation pipe that is in circulatory communication with the inside of the stainless steel cavity.

4. The composite ball mill apparatus according to claim 3, characterized in that, The circulation pipe is equipped with a receiving tank, the bottom of which is connected to the circulation pipe, and the end of the circulation pipe located at the top of the receiving tank is equipped with a discharge port.

5. The composite ball mill apparatus according to claim 3, characterized in that, A stainless steel filter screen is provided at the connection between the circulation pipe and the stainless steel cavity, and the pore size of the stainless steel filter screen is smaller than the outer diameter of the grinding media inside the stainless steel cavity.

6. The composite ball mill apparatus according to claim 3, characterized in that, The outer wall of the stainless steel cavity is a jacket structure, and the jacket structure is provided with a water valve, which is connected to an external water circulation system.

7. The composite ball mill apparatus according to claim 1, characterized in that, The driving device includes a motor and a stirring paddle. The motor drives the stirring paddle located inside the grinding tank to rotate, and the motor is fixed to the outside of the grinding tank.

8. The composite ball mill apparatus according to claim 1, characterized in that, The vibration frequency of the low-frequency mechanical vibration system is from 10Hz to 300Hz.

9. The composite ball mill apparatus according to claim 1, characterized in that, The ultrasonic system generates ultrasonic waves with frequencies ranging from 20 kHz to 100 kHz.

10. The composite ball mill apparatus according to claim 1, characterized in that, The ultrasonic system and the low-frequency mechanical vibration system are electrically connected to the controller. The controller controls the ultrasonic energy input frequency of the ultrasonic system and its instantaneous start and stop. The controller also controls the vibration frequency of the low-frequency mechanical vibration system and its instantaneous start and stop.

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