To study the bionic discrete principle of beak, a discrete roller model was designed in this study. An orthogonal experiment was then conducted with different parameters and discrete roller levels. Discrete rate and damage rate are used as evaluation indexes, and the variance analysis method is used to analyze the influence of factors including discrete roller speed, differential roller speed and vertical clearance on the discrete effects of corn ear. The combination of parameters with superior performance is optimized as follows: 250 r/min discrete roller speed, 100 r/min differential roller speed and 47.5 mm vertical clearance. Based on the mechanical properties between corn kernels, the working process of discrete roller is analyzed by using high-speed photography. It is found that discrete roller has effective result for threshing corn ear and the damage is low. This research can provide a bionic thought for designing corn threshing system.
