To solve the problems of the separating and conveying device for the potato combine harvester, such as poor separation and inflexibility of manipulation, a vertical circular separating and conveying device was designed. The structure and working parameters of key components of the separating and conveying device were determined by research analysis. Quadratic general rotation-combination experiments were carried out with the moving forward speed, the linear speed of the transverse transfer belt and the rotational speed of the circular orbit as experimental factors, damage rate and impurity rate as experimental index. The mathematical model of the relationship between the experimental factors and the experimental index were established and the parameters were optimized using DPS (data processing system) and Matlab (matrix laboratory) software. The results showed that the influences on the damage rate of the respective factors decrease in the order as below, the rotational speed of the circular orbit, the linear speed of the transverse transfer belt and the moving forward speed, the influences on the impurity rate of the respective factors decrease in the order as below, the rotational speed of the circular orbit, the moving forward speed and the linear speed of the transverse transfer belt. And the moving forward speed of 1.1 m/s, the linear speed of the transverse transfer belt of 1.5 m/s and the rotational speed of the circular orbit of 7 r/min were the best combination factors, which leaded to the damage rate of 1.28%, the impurity rate of 2.41%. Verification experiment results showed that the average damage rate of 1.46% and the average impurity rate of 2.57%, under the condition of optimal parameters, the theoretical value is similar to the test value, and its meet the relevant requirements of the potato combine harvest. This research can provide a technical basis and reference for the development of a new separating and conveying device and potato combine harvester.%为了解决目前国内马铃薯联合收获机分离输送装置存在的分离输送效果差、操控不灵活等问题,设计了一种立式环形分离输送装置.通过对该分离输送装置进行理论分析,确定了其关键零部件的结构和工作参数.以机组前进速度、横向拨送皮带线速度和环形轨道圈转速为试验因素,伤薯率和含杂率为试验指标进行了三元二次通用旋转组合试验,建立了各试验因素与指标之间的数学模型并进行了参数优化.结果表明:影响伤薯率大小的因素顺序依次为环形轨道圈转速、横向拨送皮带线速度和机组前进速度;影响含杂率大小的因素顺序依次为环形轨道圈转速、机组前进速度和横向拨送皮带线速度;且当机组前进速度为1.1 m/s、横向拨送皮带线速度为1.5 m/s、环形轨道圈转速为7 r/min时,马铃薯收获质量、土薯及杂质分离效果最好,平均伤薯率和含杂率分别为1.28%和2.41%.在最优参数条件下的田间验证试验结果表明,平均伤薯率和含杂率分别为1.46%和2.57%,理论值和试验值相近,符合马铃薯联合收获质量要求.
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