基于扩展离散元法的超声振动粉碎装置颗粒粉碎效果分析

根据超声振动原理设计了一种高效颗粒超细粉碎装置，在扩展离散元分析软件中对物料在变幅杆高频冲击下的粉碎过程进行仿真模拟，并与实验结果相比较，分析超声频率、粒径大小、颗粒材料对粉碎效率的影响。研究结果表明，随着超声频率的增加，装置粉碎效率先增大后趋于稳定，考虑到系统稳定性，选取38 kHz为最优超声振动频率；装置对粒径为200~500μm的颗粒具有良好的粉碎效果；装置对高强度、高硬度的天然、人工合成材料均有良好的粉碎效果，随着硬度的下降，粉碎效果变优，尤其适用于颗粒内部具有微缺陷和微裂纹的材料；通过对比实验验证了仿真结果的可靠性。

Effect analysis of particle crushing by ultrasonic vibration milling device based on extended distinct element method

The high-efficiency ultrafine powder crushing device was designed based on ultrasonic vibration principles. The crushing process of materials by high frequency impact of horn was simulated by the analysis software of extended distinct element method (EMEM). A comparative experiment was designed to analyze the effect of ultrasonic frequency, particle size (diameter), and particle material on the crushing efficiency. The results show that, with the increase of ultrasonic frequency, the crushing efficiency first increases and then tends to stable. Considering the system stability, 38 kHz is selected as the optimal ultrasonic vibration frequency. The device shows a good crushing effect on the particles in the size of 200~500μm. The device has a good crushing effect on the natural and synthetic materials with high strength and high hardness. As the material hardness decreases, the crushing effect of device gets better. It is found that the crushing device is particularly suitable for the materials in micro-defects and micro-cracks. The reliability of simulation is confirmed by the comparative experiment.