割前摘脱收获机立式离心分离复脱清选装置优化

针对水稻割前摘脱脱出物草谷比低和处理量大的特点,为提高谷物脱出物的处理能力,设计了一种可循环喂入的立式离心分离复脱清选装置并对其进行了响应面优化试验。以喂入速度和螺旋输送器转速为影响因素,以分离率、复脱率和破碎率为试验指标,通过二次正交旋转中心组合试验得到了其性能指标和工作参数的响应曲面模型。利用Design-Expert软件分析各参数对性能指标的交互作用可知,输送器转速对分离率、复脱率和破碎率的影响较大,而喂入速度则较小。通过多目标优化,得到最佳工作参数:输送器转速541.4 r/min、喂入量1.226 kg/s;在该参数组合下的期望结果:分离率为90.4%、复脱率为66.1%、破碎率为0.77%;在该参数组合下的验证性试验结果:分离率为89.4%、复脱率为65.2%、破碎率为0.83%。结果表明立式离心分离复脱清选装置处理效率高,谷物损伤小,能够适应对割前摘脱脱出物的处理要求。

Optimization of Centrifugal Separating-Rethreshing-Cleaning Apparatus for Stripper Combine Harvester

In order to improve the efficiency of separating, rethreshing and cleaning process of rice stripper threshed materials, the laboratory experiments were carried out on the separating components of a novel version of vertically centrifugal separating-rethreshing-cleaning apparatus that can recycle the threshed materials invariably. With feeding speed and auger rotating speed as influencing factors, separating rate, rethreshing rate and braking rate as experimental indexes, response surface models of performance indexes and working parameters were obtained through quadratic orthogonal rotation center combination experiments. By using the Design-Expert software, the interactions between each parameter and the performance indexes were analyzed. It can be seen that the auger rotating speed had a greater influence on the separating rate, the rethreshing rate and the breaking rate than the feeding speed. Multi-objective optimization results showed that the optimum working parameters were as follows: the feeding speed was 1.226kg/s and the auger rotating speed was 541.4r/min. The expected results of separating rate, rethreshing rate and breaking rate were 90.4%, 66.1% and 0.77%, respectively, and the verification experimental results were 89.4%, 65.2% and 0.83%, respectively. The results showed that the centrifugal separating-rethreshing-cleaning apparatus had the advantages of high processing efficiency, small breaking rate and the ability to meet the handling requirements of threshed materials of stripper combine harvester for paddy rice.