Authors

Abstract

In this paper, a screening machine was designed to remove the impurities in the tuber harvest, which integrates the functions of vibration screening, air separation, and flexible polishing. Discrete element simulation analysis was carried out to investigate the movement of tuber harvest and soil in the machine and the effect of polishing and removing impurities, the rationality of the structure, and the size were verified. Orthogonal tests were designed and carried out, with the rate of impurity, loss, and crushing as indicators and crank speed, impeller speed, and polishing roller speed as factors. The optimum working parameters were obtained: crank speed 280.12 r/min, impeller speed 1056.27 r/min, polishing roller speed 405.02 r/min, the impurity content was 0.29%, the loss rate was 1.01%, and the breakage rate was 0.11%. Through experimental verification, the actual value and theoretical value are basically the same, which verifies the rationality.

Abstract in Chinese

本文以清除块茎收获物中掺杂的杂质为目标，设计了一种集振动筛分、风选除杂、柔性清理功能于一体的清选机；并对清选作业过程进行离散元仿真分析，探究了块茎收获物和土壤在装置内的运动情况和清选除杂作业效果，验证了装置结构和尺寸设计的合理性；设计并开展正交试验，以含杂率、损失率、破碎率为指标，曲柄转速、叶轮转速、清理辊转速为因素，通过建立二次多项式回归方程和响应面模型，预测样机的最优工作参数组合：曲柄转速280.12 r/min、叶轮转速1056.27 r/min、抛光辊转速405.02 r/min，此时含杂率0.29%、损失率1.01%、破碎率0.11%。对预测结果优化后进行试验验证，得到预测值和优化值相近，验证了优化参数的合理性。