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。

• 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

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.

针对内叶片与外筒反向独立旋转的卧式砂磨机，提出了一种介质颗粒运动可视化测量技术。利用该实验技术，测量了磨机内磨矿介质的速度分布、速度脉动强度和出现频率。针对两种旋转方式下介质颗粒的流动特性，研究了氧化铝珠对碳酸钙的研磨性能。结果表明，两种旋转方法得到的研磨产物中位直径不仅与速度脉动强度相关，而且与按出现频率加权的速度脉动强度相关性较好（正盘式、孔盘式、十字型），内叶片与外筒反向独立旋转的卧式砂磨机。研究了叶片几何形状对速度分布、速度脉动强度和研磨介质出现频率的影响。通过对碳酸钙的研磨试验，探讨了这些流动特性与研磨速度的关系。结果表明，两种旋转方式下叶片的磨削特性与以出现频率加权的速度脉动强度有很好的相关性，据此提出了一种新型叶片（十字涡轮机型），并结合磨削介质的运动对其磨削率进行了研究。结果表明，与常用的三种叶片相比，一种新型叶片的性能最好。

项目成果

手柴敏幸、高尾征治、小森悟、村上泰弘、吉田博久: "横型サンドミルにおける内羽根と外筒の回転方式がメディア粒子の挙動と粉砕特性に及ぼす影響" 化学工学論文集. 22(印刷中). (1996)

Toshiyuki Teshibah、Seiji Takao、Satoru Komori、Yasuhiro Murakami、Hirohisa Yoshida：“卧式砂磨机内刀片和外筒的旋转方法对介质颗粒行为和研磨特性的影响”化学工程杂志 22（正在出版）（1996）

Yasuhiro Murakami and Toshiyuki Teshiba: "Research and development Trends in Sand Mills" J.Soc.Powder TechnoL,Japan. 31. 493 (1994)

Yasuhiro Murakami 和 Toshiyuki Teshiba：“砂磨机的研究和开发趋势”J.Soc.Powder TechnoL，日本。

手柴敏幸、高尾征治、小森悟、村上泰弘、吉田博久: "横型サンドミルにおける撹拌翼の幾何形状がメディア粒子の挙動と粉砕特性に及ぼす影響と新型翼の開発" 化学工学論文集. 22(印刷中). (1996)

Toshiyuki Teshibah、Seiji Takao、Satoru Komori、Yasuhiro Murakami、Hirohisa Yoshida：“卧式砂磨机中搅拌叶片的几何形状对介质颗粒的行为和研磨特性的影响以及新型叶片的开发”杂志化学工程。22（印刷）（1996）

村上泰弘、手柴敏幸: "サンドミル研究とサンドミル開発の動向" 粉体工学会誌. 31. 493-499 (1994)

Yasuhiro Murakami，Toshiyuki Teshuba：“砂磨机研究和砂磨机发展的趋势”粉末工程学会杂志 31. 493-499 (1994)。

Toshiyuki Teshiba, Masaharu Takao, Satoru Komori, Yasuhiro Murakami and Hirohisa Yoshida: "Effect of Rotation Method of Internal Blade and External Cylinder on Motion of Media Particle and Grinding Characteristics in Horizontal Type Sand Mill." Kagaku Kog

Toshiyuki Teshiba、Masaharu Takao、Satoru Komori、Yasuhiro Murakami 和 Hirohisa Yoshida：“内刀片和外筒的旋转方式对卧式砂磨机介质颗粒运动和研磨特性的影响”。