Study on the throwing mechanism and loss characteristics of three-dimensional disturbance comb

Abstract

To reduce rice harvest loss and explore the performance of different combs for threshing prior to cutting, a three-dimensional tip disturbance comb and a three-dimensional bionic disturbance comb were designed. Based on high-speed camera technology and bench tests, the throwing mechanisms, distribution characteristics and loss rates of three kinds of combs, including primitive plane angular combs, were explored. Through comparative analysis of the material diffusion angle and throwing mechanism, it was obtained that the average material diffusion angle of the three combs decreased gradually with increasing rotating speed and that the material diffusion angle and stability of the three-dimensional bionic disturbance comb performed best. At the same rotating speed, the fitting slope ratio of the three-dimensional bionic disturbance comb was the largest, and the effect of throwing and transporting materials was the best. The total loss rates of three kinds of comb teeth were obtained by analyzing the falling grain loss rate and uncombed loss rate: three-dimensional tip disturbance comb > primitive plane angular comb > three-dimensional bionic disturbance comb; the corresponding minimum total loss rates were 6.17 %, 5.76 % and 2.71 %.