三七种子的物理机械特性试验

Experimental study on physical and mechanical characteristics of Panax notoginseng seeds

测定了不同含水率的三七种子的三轴尺寸、密度、内摩擦角、休止角以及与不同材料间的静、动滑动摩擦角和漂浮速度。结果表明：三七种子长、宽、高范围分别为5.2~7.2 mm、4.8~6.8 mm和4.0~6.0 mm;平均直径为5.62 mm,球度为90.86%,近似球体;三七种子的密度随含水率的下降逐渐减小,且与含水率呈线性相关;种子内摩擦角、休止角、滑动摩擦角皆随含水率下降呈先减小,再增大,后减小的趋势;种子平均漂浮速度为5.77~8.96m/s,平均漂浮速度与种子含水率呈正相关。

The three axis size, density, angle of internal friction, and angle of repose for Panax notoginseng seeds with different moisture content were measured as well as the angle of static sliding friction and dynamic sliding friction with different contact materials under various floating speed. The results showed that： length, width and height of Panax notoginseng seed is 5.8-7.2 mm, 4.8-6.8 mm and 4.0-6.0 ram, respectively; the average diameter is 5.62 mm and the sphericity is 90.86% indicating the Panax notoginseng seed can be approximate to sphere. The seeds density decrease linearly with the decrease of water content. As a decrease in moisture content, the angle of internal friction and the angle of repose firstly decreased and then increased to maximum value as well as the angle of sliding friction. The average floating speed is 5.77-8.96 m/s, which presents a linear positive correlation with the moisture content.