可调节式毛刷指夹式玉米精量排种器性能试验OA

To meet the requirements of precision seeding and seeding adaptability,an adjustable brush-type finger-clip precision seed metering device for corn was developed.The structure and working principle of the metering device were described,and the main structural parameters of the metering device were optimized.Taking the operating speed of the seed metering device and the brush gap as the test factors,the single-grain rate,multi-grain rate and missing clip rate as the evaluation indexes,the single-factor adaptability test was carried out on four types of seeds,and the influence of each test factor on the seeding performance index was revealed.The results showed that the seed metering device had good adaptability to different types of seeds.The quadratic orthogonal rotational combination test design was adopted,and flat large-grain seeds were selected as the experimental objects.The Design-Expert 13.0.1 software was used for data pro-cessing and analysis to establish the mathematical model between each factor and the evaluation index,and the regression equation was obtained.Through multi-objective optimization,the optimal combination parameters were obtained:when the operating speed was 6.5 km/h and the brush gap was 3.8 mm,the single-seed rate was 91.50%,the multi-seed rate was 4.10%,and the missed-seed rate was 4.40%.Under these conditions,verification tests were conducted,and the single-seed rate was 90.91%,the multi-seed rate was 4.42%,and the missed-seed rate was 4.67%.The verification results were basically consistent with the optimization results.Field seeding tests showed that the single-seed rate of the metering device was 89.88%,the multi-seed rate was 4.88%,and the missed-seed rate was 5.24%,and all the indica-tors met the agronomic requirements of precision corn seeding.