Abstract: Aiming at the problems of large loss rate and high impurity content during Leymus chinensis seeds harvesting process by allfeeding combine harvesters owing to the cleaning operation process, coupled with the physical characteristics of Leymus chinensis seeds, an airandscreen cleaning device for Leymus chinensis seeds was designed. It was designed and optimized cleaning components, feeding devices, and receiving devices. The indoor performance test of the airandscreen cleaning device was carried out. The mechanism of cleaning performance as a function of each factor was obtained using a single factor test. The response surface test was used to establish the relationship between each factor and the impurity rate and loss rate. Through analysis of factors interaction, the best combination of working parameters was obtained, whereby speed of the vibrating screen was 275 r/min, speed of the fan was 985 r/min, and feed rate was 0.087 kg/s. At this time, the impurity rate was 27.3%, and the loss rate was 3.3%. It was established that the airandscreen screen cleaning device met the design requirements, which can provide a reference for research and development of Leymus chinensis and other gramineous forage seeds that are fed into the combine harvester.

Key words: Leymus chinensis seeds, airandscreen cleaning, combine harvest, impurity rate, loss rate

摘要： 针对目前全喂入联合收获机收获羊草种子过程中存在损失率大、含杂率高的问题，根据清选作业流程，结合羊草种子自身物理特性，搭建羊草种子风筛清选装置，并对清选部件、喂料装置、接料装置进行设计优化。进行风筛清选装置室内性能试验研究，通过单因素试验，得出清选性能随各因素变化的规律，利用响应面试验建立各因素与含杂率和损失率的关系，并对各因素及其交互作用进行分析。最后得出较优工作参数组合为：振动筛转速275 r/min，风机转速985 r/min，喂入量0.087 kg/s，在此参数组合下试验的含杂率为27.3%，损失率为3.3%，风筛清选装置满足设计要求，可为研发羊草等禾本科牧草种子全喂入联合收获机提供参考。

关键词: 羊草种子, 风筛清选, 联合收获, 含杂率, 损失率