摘要
为了探寻偏心振动磨的最佳工艺参数,达到减小乏能区、提高研磨效率的目的,以单筒偏心振动磨为研究对象,建立偏心振动磨内部介质运动数学模型。借助于离散元素法颗粒系统分析软件EDEM,模拟不同振幅、频率组合下研磨介质与物料的运动状态。理论与试验研究结果表明:系统在简谐激振力作用下,筒体以高频率连续振动,介质在磨腔内形成明确的动态回转质心,且随激振频率和振幅不同有所变化;研磨介质和物料混合过程中,振幅增大混合速度增加,但振幅过大时部分物料被甩到磨腔边缘,混合均匀度反而降低;当激振频率为16 Hz,振幅为10 mm时,介质运动范围较大,乏能区明显减小,物料与研磨介质间接触力增加,研磨效率大大提高。因此,可以通过控制激振频率和振幅等参数来获得更有利的研磨效果,提高研磨效率。
In order to explore the optimum parameters of eccentric vibration grinding, improve the grinding efficiency and diminish the deficiency area in the center of the cylinder, single-tube eccentric vibration mill was studied as the research object to build the mathematical model of internal medium motion. The motion state of the grinding media and materials under different combination of amplitude and exciting frequency was simulated by particle system analysis software EDEM based on discrete element theory. Theoretical and experimental results show that the main body vibrates continuously with high frequency on the simple harmonic exciting force and the medium has a definite dynamic rotation center in the grinding cavity, which varies with the amplitude and exciting frequency. In the mixing process of grinding medium and material, the mixing speed increases with the larger amplitude. However, when the amplitude gets too large, part of the material is thrown to the edge of the mill, which reduces the mixing uniformity. When the amplitude reaches 10 mm and the exciting frequency remains at 16 Hz, the range of medium motion is larger and the deficiency area gets smaller. Meanwhile, under this condition, the tangential force between grinding medium and material increases significantly. This will contribute much to the efficiency of smashing. Therefore, the effect and efficiency of grinding can be improved by controlling the parameters of exciting frequency and amplitude.
作者
李梦月
徐波
李生娟
LI Mengyue1, XU Bo1, LI Shengjuan2(1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093 , China ;2. School of Material Science and Engineering, University of Shanghai for Science and Technology,Shanghai 200093, Chin)
出处
《轻工机械》
CAS
2018年第2期36-40,共5页
Light Industry Machinery
基金
国家自然科学基金资助项目(51402192)
关键词
偏心振动磨
离散元素法
振幅
激振频率
运动轨迹
eccentric vibration mill
DEM （discrete element method）
amplitude
exciting frequency
movement locus
