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Optimization design and experiment on ripple surface type pickup finger of precision maize seed metering device

International Journal of Agricultural and Biological Engineering 2017年第1期10卷 61-71页

作者： Wang Jinwu Tang Han Wang Jinfeng Li Xin Huang Huinan College of Engineering Northeast Agricultural UniversityHarbin 150030China

A ripple surface type pickup finger was designed to improve the performance of pickup finger precision maize seed metering device and to provide a solution for precision maize *** main structure and working principle of seed metering device were detailed in this *** dimension size distributions of maize seeds in different types were studied,the gestures of seeds clamped by pickup finger were analyzed,and the clamping dynamical model of pickup finger was established by theoretical *** optimize the structural parameters of ripple surface type pickup finger,the discrete element method(DEM)model of pickup finger precision maize seed metering device was established by the discrete element software *** numerical simulations of orthogonal seeding performance experiments were conducted to analyze the influences of these factors on the quality of *** rotational speed,wavelength of ripple surface and amplitude of ripple surface were selected as the experimental *** average seeding qualified index and the average seeding coefficient of variation on four different types of maize seeds were chosen for evaluating the seeding *** results showed that,the average seeding qualified index was 93.35%and the average seeding coefficient of variation was 11.23%under conditions of the 25 r/min rotational speed,8 mm wavelength of ripple surface and 2 mm amplitude of ripple *** the same condition,the bench test was done which showed that the results of test and simulation were *** maximum error of qualified index was 1.95%and the qualified index of improved seed metering device exceeded the original one by 12.34%.The working performance can meet the requirements of precision maize seeding.

关键词： precision maize planter seed metering device pickup finger ripple surface

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