Authors

Abstract

To address the problems of high breakage rates, high entrainment losses and many unthreshed kernels when harvesting high moisture content maize seeds, a high moisture content maize seed threshing test was designed based on a multifunctional seed harvester stand designed by this group.In order to determine the optimum operating parameters of the threshing unit, single-factor experiments and orthogonal tests were carried out using the threshing drum speed, concave plate clearance and feed rate as test factors and the crushing rate, unthreshing rate, entrained loss rate and trash content rate as test evaluation indicators.The optimum combination of test factors obtained for the harvesting of maize at 32% to 34% moisture content was a drum speed of 346.55r/min, a concave plate clearance of 44.39mm and a feed rate of 9.739Kg/s.After repeated experiments on the bench, the test results with optimum parameters were 6.311% crushing rate, 0.187% unthreshing rate, 0.912% entrained loss rate and 4.251% impurity rate, at which point the crushing rate was the lowest and the other three met national standards.

Abstract in Chinese

针对高含水率玉米籽粒收获时破碎率高、夹带损失大、未脱净籽粒多的问题，基于本课题组设计的多功能籽粒收获机台架设计了高含水率玉米籽粒脱粒试验。为确定脱粒装置的最佳工作参数，以脱粒滚筒转速、凹板间隙和喂入量为试验因素，以破碎率、未脱净率、夹带损失率和含杂率为试验评价指标，进行了单因素实验与正交试验。在进行32%~34%含水率的玉米收获试验时获取的试验因素最优参数组合为滚筒转速为346.55r/min，凹板间隙为44.39mm，喂入量为9.739Kg/s，经过台架的重复实验，最优参数下的试验结果为破碎率为6.311%，未脱净率为0.187%，夹带损失率为0.912%，含杂率为4.251%，此时破碎率最低，其他三项符合国家标准。