丘陵山地胡麻联合收割机作业参数优化与试验

Optimization and experiment of operation parameters of hilly area flax combine harvester

为提高丘陵山地胡麻联合收割机工作效率,该研究以作业机前进速度、脱粒滚筒转速和吸杂风机转速为自变量,以脱净率、总损失率和籽粒含杂率为响应值,依照Box-Behnken试验设计原理,采用三因素三水平响应面分析方法分别建立各因素与响应值间的数学模型,并对各因素及其交互作用进行分析。结果表明:3个因素对脱净率影响的主次顺序为脱粒滚筒转速、前进速度和吸杂风机转速,对总损失率影响的主次顺序为前进速度、吸杂风机转速和脱粒滚筒转速,对籽粒含杂率影响的主次顺序为吸杂风机转速、脱粒滚筒转速和前进速度;作业机最佳工作参数如下:前进速度为0.65 m/s、脱粒滚筒转速为830.3 r/min、吸杂风机转速为1154.39 r/min。在最优工作参数下作业机脱净率、总损失率和籽粒含杂率均值分别为96.33%、1.87%和3.24%,说明在该作业参数下作业机能够降低收获总损失和籽粒含杂率。

In order to improve the working efficiency of the flax combine harvester in hilly areas,this study took the forward speed of the working machine,the rotating speed of threshing drum and the rotating speed of impurity suction fan as independent variables,and the threshing rate,the total loss rate and the impurity content rate of grains as response values. According to the Box-Behnken experimental design principle,the mathematical models between each factor and the response values were established by using the response surface analysis method of three factors and three levels,and the interaction of each factor was analyzed.The results showed that the order of impact of the threshing rate was the speed of the threshing cylinder,advanced machine,and centrifugal fan. The order of effects of the total loss rate was the speed of the developed device,centrifugal fan,and threshing cylinder,and the order of impact on the impurity rate was the speed of the centrifugal fan threshing cylinder and advanced machine. The optimal working parameters of the device were as follows:the advance speed of 0.65 m/s,the threshing cylinder speed of 830.3 r/min,and the centrifugal fan speed of 1154.39 r/min. The validation test showed that the average threshing rate was 96.33%,the total loss rate was 1.87%,and the impurity rate was 3.24%. The results show that the total loss and seed impurity rate of hilly area flax combine harvester could be reduced under the operation parameters,which could provide a specific reference for the design and experiment of hilly area flax combine harvester.