横轴流脱粒分离装置的数学模型的建立与试验

A mathematical model and test of the horizontal axial flow threshing separation device

横轴流脱粒分离装置滚筒长度限制了其脱粒分离能力,仅被应用于中小型联合收割机。为研究横轴流脱粒分离装置脱粒滚筒转速、喂入量、脱粒间隙等因素对脱粒分离性能的影响,优化装置结构,利用概率学理论建立了横轴流脱粒分离装置的未脱净率和夹带损失率数学模型。对模型正确性验证试验表明,模型对未脱净率的预测相对误差为8.23%,对夹带损失率的预测相对误差为2.90%。仿真分析和试验表明,该模型可反映籽粒轴向分布和脱粒滚筒转速、喂入量、脱粒间隙等参数对脱粒分离性能的影响。

The cylinder length limits the threshing and separating ability of the horizontal axial flow threshing separation device, which is only used in the small and medium-sized combined harvesters. In order to study the effect of the cylinder speed, the feed rate and the concave clearance on the threshing performance of the horizontal flow threshing unit, a mathematical model was established to optimized its structure by using the probability theory. The verification tests were carried out, and the results showed that the average relative error of the prediction of the unthreshing rate is 8.23%, and the average relative error of the unseparated rate is 2.90%. Simulation analysis and single factor test showed that the model could reflect the influence of the threshing cylinder speed, the feed rate, the concave clearance and other parameters on the threshing separation performance.