关键词: 荞麦籽粒群, 滑动摩擦因数, 休止角, 含水率, 品种, 材料

Abstract: In order to reduce the friction loss of buckwheat grains in the process of mechanized operation, this paper studied the tribological properties of buckwheat grains. Heifeng 1 and Yuqiao 4 were selected as the research objects.The sliding friction coefficients between different varieties and different moisture content of buckwheat grain groups and different materials were studied, and the repose angle of buckwheat grain with different moisture content was analyzed. The result showed that variety and moisture content have significant effects on the sliding friction factor of buckwheat grains. The sliding friction factor of Heifeng 1 was greater than that of Yuqiao 4. With the increase of moisture content, the sliding friction coefficients of the buckwheat grain group showed an increasing linear trend. The moisture content had a significant effect on the repose angle of the buckwheat grain group. With the increase of the moisture content, the repose angle of the buckwheat grain group increases approximately linearly, and the variation range was 27.98°-38.70°. The sliding friction coefficients between the buckwheat grain group and the stainless steel plate and aluminum plate were 0.332-0.454 and 0.368-0.503, respectively. The sliding friction coefficients between the buckwheat grain group and the stainless steel plate were lower than that of the aluminum plate. This research provided a theoretical basis for the development and optimization of buckwheat mechanized operation equipment.

Key words:  buckwheat grain group, sliding friction coefficients, repose angle, moisture content, variety, material