DESIGN AND EXPERIMENT OF HIGH MOISTURE CORN THRESHING DEVICE WITH LOW DAMAGE

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.