振动研磨过程中研磨参数的定量研究

Quantitative study of the milling parameters in vibratory milling

蛋白质的提取率取决于被提取的生物组织的粉末粒度,因而生物组织的粉碎是蛋白质提取工程中的关键技术之一。目前,生物组织粉碎较多采用振动球磨方式,研磨产品粒度和研磨效率与研磨过程的特征参量如碰撞频率、碰撞能量有密切关系。为了研究研磨参数对研磨特征参量的影响规律,该文采用事件驱动法(event driven method,EDM)建立了振动球磨机构中单个磨球在研磨罐内的动力学模型,获得了振动频率、振动幅度和研磨罐直径对碰撞频率和碰撞能量的影响规律。结果表明:碰撞频率、碰撞能量均随着振动频率和振动幅度增大而增大;在相同的磨腔体积即研磨罐容积下,随着研磨罐直径的增大碰撞频率和碰撞能量减小。该结论为研磨机构设计和参数选择提供理论依据和方法。

The extraction rate of protein extracted from biological tissue depends on the particle size of the biological tissue powder;therefore,the biological tissue particle sizes need to be smaller to improve protein extraction.Vibratory milling method is widely used for size reduction of biological tissue products with the milling product size and milling efficiency significantly affected by the milling process parameters,such as the collision frequency and impact energy.The effects of the milling parameters on the milling process were studied using the event driven method（EDM）to construct a dynamic model of one milling ball in a milling vial in a vibratory milling mechanism.The effects of the vibration frequency,the vibration amplitude and the milling vial diameter on the collision frequency and the impact energy were then investigated.Increases in the vibration frequency and amplitude increased the collision frequency and impact energy.For a fixed milling vial volume,an increase in the milling vial diameter reduced the collision frequency and the impact energy.The results provide a theoretical basis for milling mechanism design and parameter selection.