A Study on Grinding Mechanism of Fine Particles in a Sand-Mill by Using an Image-Processing Techinque and a Development of an Original Sand-Mill.

利用图像处理技术研究砂磨机细颗粒研磨机理及原创砂磨机的研制。

基本信息

批准号：
06650861
负责人：
MURAKAMI Yasuhiro
金额：
$ 1.28万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650861/
关键词：
sand mill particle grinding image processing grinding characteristics 粉砕微粒子

项目摘要

A measuring technique to visualize the motion of media particle is originally developed for a horizontal type sand mill of which internal blade and external cylinder rotate inversely and independently. Using this experimental technique, velocity distribution, intensity of velocity fluctuations and appearance frequency of grinding media in the mill were measured. Relating to these flow characteristics of media particles for both rotation metods, grinding performance of calcium carbonate with alumina beads was investigated. The results show that the median diameter of ground products obtained in both rotation methods can not be correlated only with the intensity of velocity fluctuations, but can well be correlated with the intensity of velocity fluctuations weighted by appearance frequency.In addition, motions of grinding media were visualized for three types of blade (normal disk type, hole disk type and cross type) in a horizontal type sand mill of which internal blade and external cylinder rotate inversely and independently. The effects of blade geometry on velocity distribution, intensity of velocity fluctuations and appearance frequency of grinding media were investigated. The relationship between these flow characteristics and grinding rate was discussed by carrying out grinding tests of calcium carbonate. The results show that grinding characteristics obtained for each blade in both rotation methods can well be correlated with the intensity of velocity fluctuations weighted by appearance frequency.A new type of blade (cross turbine type) was proposed on the basis of the above mentioned information, and its grinding rate was investigated in connection with the motion of grinding media. The results show that a new type of blade is the best compared to usual three types of blade.

一种可视化介质颗粒运动的测量技术最初是为卧式砂磨机开发的，其内刀片和外筒独立反向旋转。利用该实验技术，测量了磨机中研磨介质的速度分布、速度波动强度和出现频率。与两种旋转方法的介质颗粒的这些流动特性相关，研究了带有氧化铝珠的碳酸钙的研磨性能。结果表明，两种旋转方法得到的研磨产物的中值直径不能仅与速度波动的强度相关，而与按出现频率加权的速度波动的强度有很好的相关性。此外，研磨介质的运动可视化了内刀片和外筒独立反向旋转的卧式砂磨机中的三种类型刀片（普通盘式、孔盘式和十字式）。研究了叶片几何形状对速度分布、速度波动强度和研磨介质出现频率的影响。通过碳酸钙的研磨试验，讨论了这些流动特性与研磨速率之间的关系。结果表明，两种旋转方法中每个叶片获得的磨削特性都可以很好地与以出现频率加权的速度波动强度相关。基于上述信息，提出了一种新型叶片（交叉涡轮型），并研究了其研磨速率与研磨介质运动的关系。结果表明，与通常的三种类型的刀片相比，新型刀片是最好的。