Design and Tests of Mechanical-pneumatic Combined Peanut Precision Seed-metering Devices

Aiming at the problems of low adsorption rate and high wind pressure when sowing large-diameter seeds such as peanuts with air-suction type metering device, a mechanical-pneumatic combined peanut precision seed-metering device was designed by using pneumatic and mechanical cooperative seed picking, gas blocking and seed unloading, and mechanical carrying seed.In filling stage, bumps were used to disturb, positioning and hold seeds. Seeds collection were coordinated with negative pressure of the hole.These may effectively improve the filling performance.After the simulation analyses of seed disturbance performance with different structure seed-metering discs, results show that the best seed disturbance performance comes from the one using ring groove double V-shaped bump.Taking shapes of seeds, rotational speeds of seed-metering disc and working negative pressure as factors, seed-metering performance tests with double V-shaped bump were conducted. Results show that the spherical seeds have the best seed-metering performance. The optimal parameter combination of the seed-metering devices was determined through multi-objective parameter optimization.Field test results show that the seed-metering device may meet the requirements of peanut precision seeding. © 2020, Editorial Office of Journal of CIFST. All right reserved.