DESIGN AND EXPERIMENT OF AUTOMATIC SEED FILLING DEVICE FOR SOYBEAN PLOT SEEDER

To address problems such as low working efficiency and the difficulty of manual seed filling during seed breeding with a soybean plot seeder, a new type of automatic seed filling device with a rotational disc was designed. The design integrates a rotational seed disc coupled with seed cups. The automatic seed filling device consists of a mechanical part and an electrical control part. The mechanical part includes seed cups, a seed plate, a base, and a mounting bracket, while the electrical control part includes a PLC, motor, and driver. By analysing the soybean seed delivery process, the factors influencing the design of the seed cup structure were identified, and key structural design and parameter analysis of the seed cup were conducted. Field test results showed that the minimum qualification rate of seed cup offset was 98.78%, and the minimum qualification rate of seed filling without seed breakage was 96.18%. These results demonstrate good accuracy and reliability, meeting the agronomic requirements of field seeding with plot seeders, and the experimental performance reached the design expectations.