Authors

Abstract

To address the issues of high admixture and loss rates during seed production and harvesting operations with combine harvesters, a low-loss, high-purity cleaning device suitable for wheat seed production and harvesting was designed. Considering the actual conditions of seed production and harvesting operations, the structure and dimensional parameters of key components were optimized. Through theoretical analysis, a motion model of wheat seeds on the cleaning sieve was established, identifying the main factors affecting the cleaning performance as fan speed, sieve amplitude, and vibration frequency. The CFD-DEM coupling method was used to simulate and analyze the sieving process under the influence of airflow within the cleaning chamber. A three-factor, three-level quadratic regression orthogonal combination simulation test was conducted to establish a response surface regression model for seed admixture rate and seed loss rate. Multi-objective comprehensive optimization of the factors indicated that the optimal operating parameters of the cleaning device are a fan speed of 1143 rps, an amplitude of 28 mm, and a vibration frequency of 9.4 Hz. Finally, field trial verification was conducted by setting the working parameters based on the coupled simulation test data. The operational results of the optimized cleaning device showed a seed admixture rate of 1.47% and a seed loss rate of 1.07%, with all results meeting the relevant standards. This study can provide valuable theoretical support for the development of wheat seed production and harvesting machines.

Abstract in Chinese

为解决联合收获机在进行制繁种收获作业时混杂率、损失率较高等问题，设计了一款适用于小麦制繁种收获作业的低损高净度清选装置。结合实际制繁种收获作业情况，优化了关键部件的结构及尺寸参数。通过理论分析，建立了小麦种子在清选筛上的运动模型，确定了影响清选效果的主要因素为风机转速、清选筛振幅和振动频率。采用 CFD-DEM耦合方法对清选室内部气流作用下的筛分过程进行模拟分析，开展了三因素三水平二次回归正交组合仿真试验，建立了种子混杂率和种子损失率的响应面回归模型，对各因素进行多目标综合优化，结果表明：风机转速1143 rps、振幅28 mm、振动频率9.4 Hz，是清选装置的最优工作参数。最后，以耦合仿真试验数据为基础设置工作参数，进行田间试验验证，优化后的清选装置作业结果为：种子混杂率1.47 %、种子损失率1.07 %，结果各项均满足相关标准。本研究可为小麦制繁种收获机的研发提供有价值的理论依据。