Authors

Abstract

To address the requirements of direct corn kernel harvesting in the Huang-Huai-Hai region of China, this study aimed to rectify issues related to kernel damage and low threshing rates observed in the operation of existing corn kernel direct harvesting machines. Initially, a novel threshing device was designed, incorporating staggered rotary motions for the threshing cylinder and concave grate. Subsequently, the experimental factors such as the speed of threshing drum, the speed of concave grate and the threshing gap were considered on the test bench, and the indexes such as corn grain crushing rate and threshing rate were evaluated.Moreover, orthogonal testing indicated that optimal threshing performance was achieved with a threshing cylinder speed of 287 r/min, a concave grate speed of 106 r/min, and a threshing clearance of 49 mm, resulting in a kernel crushing rate of 4.12% and a threshing rate of 94.18%. These experimental findings confirm the feasibility of the Rotating Concave Screen Threshing Device, underscoring its ability to significantly enhance corn threshing rates while minimizing kernel fragmentation and damage.

Abstract in Chinese

为了满足中国黄淮海地区玉米籽粒直接收获的要求，本研究旨在解决现有玉米籽粒直收机操作中观察到的与籽粒损伤和脱粒率低相关的问题。设计了一种新型脱粒装置，其中脱粒滚筒和凹板筛交错反向旋转运动。选取脱粒滚筒转速、凹板筛转速和脱粒间隙为试验因素，玉米籽粒破碎率和脱净率等试验指标开展了台架试验。实验结果揭示了这些因素对玉米粒破碎率和脱净率的影响。正交试验表明，当脱粒滚筒转速为287 r/min、凹板筛转速为106 r/min、脱粒间隙为49 mm时，脱粒效果最佳，籽粒破碎率为4.12%，脱净率为94.18%。这些实验结果证实了旋转凹板筛脱粒装置的可行性，强调了其在最大限度地减少谷粒破碎和损坏的同时显著提高玉米脱净率的能力。