Test on Effect of the Operating Speed of Maize-soybean Interplanting Seeders on Performance of Seeder-metering Devices☆

To improve the operating efficiency of seeders and enable the seeder-metering device to keep good metering performance at different operating speeds of seeders, in this paper a multifunctional smart test bench for STB-700 seeder-metering devices and a 2BJYM-5 maize-soybean interplanting precision seeder, were used for metering and seeding tests with two different kinds of soybean and maize seeds. Research results showed that, the rotating speed of the seeder-metering device at different operating speeds of maize-soybean interplanting precision seeders had influence on the metering performance of the seeder-metering device. Then the influence trend was explored. With the function fminbnd in MATLAB, the minimum point of acceptable re-seeding rate was determined to be at 43.05 r/min, the minimum point of miss-seeding rate at 39.96 r/min and the minimum point of interplanting distance variation coefficient at 40.25 r/min. Therefore, the optimal operating speed range of the seeder-metering device when being installed in the seeder was identified, further determining spoon-shaped metering devices and adjustable cell-wheel metering devices not suitable for seeding at high speeds.