玉米种子仿生脱粒机性能试验与参数优化.

Corn seed bionic thresher was designed based on the principle of first discretizing and then threshing, which imitated the process of chicken beak discretizing corn grain and bare hand threshing, and had the advantages of low damage, low broken rate, and so on. In order to optimize the parameter of corn seed bionic threshing system, and then reduce the damage in the course of threshing of corn seed, this paper adopted the method of the quadratic regression orthogonal rotation combination design. Grain broken rate and removal rate were taken as the main performance indicators, differential roller speed, discrete roller speed, threshing roller speed, discrete roller gap, and threshing roller gap were selected as experimental factors, and the performance test of the corn seed bionic thresher was carried out. According to the test results, the influence of discrete roller speed and threshing roller speed on the broken rate and removal rate was respectively analyzed, as well as the influence of discrete roller gap and threshing roller gap on the broken rate and removal rate. Analysis results showed that when the threshing roller speed was fixed at a certain level, and the discrete roller speed increased from 150 to 350 r/min, the broken rate first increased and then decreased; when the discrete roller speed was fixed at a certain level, with the increasing of the threshing roller speed from 150 to 350 r/min, the broken rate decreased gradually; when the discrete roller speed was in 150-180 and 310-350 r/min, and the threshing roller speed was in 270-350 r/min, the broken rate was 0, which reached the lowest. The threshing roller speed was fixed at a certain level, and the discrete roller speed changed in the range of 150-350 r/min, the removal rate first increased and then decreased; when the discrete roller speed was fixed at a certain level, with the increase of threshing roller speed, the removal rate decreased gradually; when the discrete roller speed was in 230-330 r/min, and the threshing roller speed was in 150-300 r/min, the removal rate reached 100%, which was the highest. When the discrete roller gap was in 0-4 mm, and the threshing roller gap was in 5-9.2 mm, the broken rate was 0, reaching the lowest. When the discrete roll gap was fixed at a certain level, and the threshing roller gap reduced from 9.2 to 0 mm, the removal rate continued to increase; when the threshing roller gap was in 0-2.2 mm, the removal rate was 100%, which was the highest. On the basis of the experimental curve, through the optimization with the comprehensive evaluation method, the optimal combination of parameters was obtained: the differential roller speed of 90 r/min, the discrete roller speed of 350 r/min, the threshing roller speed of 350 r/min, the discrete roller gap of 4.6 mm, and the threshing roller gap of 4.6 mm. The verification test was carried out on the basis of these optimal conditions. It was found that the breaking rate was 0.226%, the net removal rate was 99.317%, and the corncob integrity was 100%. All the results meet the requirements of the national standard. [ABSTRACT FROM AUTHOR]