通过对分级机的主要结构参数的分析，确定了正交试验和均匀试验的因素为：滚筒转速和滚筒倾角。

Based on analyzing on the primary structural parameters of sorting machine, we determined that the parameters in orthorhombic test and uniform experiment are obliquity of cylinder and rev of cylinder.

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分析了三层滚筒式银杏分级机的结构特点及工作过程，并对分级机的分级性能及筛孔大小进行了试验研究。

This paper analyzed the structure and the working process of three-layer-cylindrical grader and the grading performance and screen mesh-size are experimentally studied.

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