Analytical design and test of a clip-based precision corn seed metering device using DEM-MBD coupling

This study sets out to address the challenges of improving precision, stability, and efficiency in corn seed metering systems. A novel clip-based precision seed metering device was developed, integrating an optimised seed-filling clip to enhance seed capturing and metering accuracy. The overall structure and working principles of the device were described, focusing on key components such as the seed-filling clip, clamping slot, and torsion spring. The coupled DEM-MBD simulation method was employed to analyse the interaction forces and trajectories of corn seeds during the filling and metering process, enabling parametric optimisation of the device. The effects of clip protrusion width, clamping slot length, and metering speed on seeding performance were systematically investigated. Field validation tests demonstrated a qualification rate of 90.76%, a missing rate of 4.83%, and a multiple rate of 4.4%, with an error of 1.4% compared to simulation results. The results confirm the device's ability to stably and accurately meter seeds, showcasing its potential for mechanized corn seeding with enhanced precision and operational stability.