Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 21, Issue 10
Displaying 1-7 of 7 articles from this issue
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  • Mechanics of Grinding Media in Vibration Mill
    Chu BOYI
    1984 Volume 21 Issue 10 Pages 615-620
    Published: October 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.615
    JOURNAL FREE ACCESS
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    This paper puts forward two main forms of motion of grinding media in a horizontal cylindrical shell of a vibration mill under movement along a circular orbit. The first is the throw-up and falling motion of the grinding media in the gravitational field. The second is the impact action of the shell wall on the grinding media, by which the grinding media is made to vibrate in radius direction. Based on the impact and moment theorems, the formulae of the forces acting between the shell and grinding media, and the formula of power consumption of grinding media are deduced.
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  • The Analysis of Vibration in a Vibration Mill
    Chu BOYI
    1984 Volume 21 Issue 10 Pages 620-626
    Published: October 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.620
    JOURNAL FREE ACCESS
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    By means of methods of “control theory” and “system identification theory”, a mathematical model of a vibration mill —a vibration system containing loose materials— is set up, and the physical meaning of added mass and the damping of loose materials are expound. From the analysis formulae of power consumption of grinding media is obtained. The effects of amplitude and frequency on milling processes are also analyzed by applying the results, and a general principle for selecting amplitude and frequency is proposed.
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  • Development of a Fineness Measuring Air Classifier (II)
    Yukiyoshi YAMADA, Masayuki YASUGUCHI, Hiroshi MURAKAMI, Yoshihiro SATO ...
    1984 Volume 21 Issue 10 Pages 627-632
    Published: October 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.627
    JOURNAL FREE ACCESS
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    We have just developed an on-line fineness measuring system by using our new air classifier. For cement powder, the Blaine value of the specific surface area (cm2/g) has been satisfactorily calculated by choosing a cut size Dp50=8.5μm.
    This paper, presents the outline of the measuring systems and one year's operation results in a cement mill. The on-line system shows the same performance as the off-line one. Especially, the linear relationship between the coarse powder yield η(%) and Blame value of the specific surface area B(cm2/g) in the line is almost the same equation as the fundamental one. The equation is as follows: B=-116.8η+12144 The Blame value measuring accuracy from on-line data is 41.2cm2/g (standard deviation), Furthermore, the correlation coefficient r of the equation is improved from 0.968 to 0.984 compared with the off-line one.
    The newly developed on-line fineness measuring apparatus shows good durability in long time operation.
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  • [title in Japanese]
    Sumio KOBAYASHI, Shunji MIYAHARA
    1984 Volume 21 Issue 10 Pages 633-637
    Published: October 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.633
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Shinya HAYASHI
    1984 Volume 21 Issue 10 Pages 638-645
    Published: October 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.638
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    Saburo YASHIMA
    1984 Volume 21 Issue 10 Pages 646-655
    Published: October 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.646
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1984 Volume 21 Issue 10 Pages 661-671
    Published: October 10, 1984
    Released on J-STAGE: April 30, 2010
    DOIhttps://doi.org/10.4164/sptj.21.661
    JOURNAL FREE ACCESS
    Download PDF (4598K)
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