DESIGN AND TEST OF THE SOCKET-ROLLER SEEDING-METERING DEVICE FOR DOUBLE-ROW PRECISION SEEDING OF WHEAT

摘要

In order to improve the precision of mechanical wheat seeder, a socket-roller wheat double-row precision seed-metering device was designed in this paper. The overall structure and size of the device are designed, especially the socket-roller type seed-metering wheel, and its hole is determined as ellipsoid hole. In order to increase the interference intensity of seed-metering wheel to seeds and reduce the phenomenon of missing seeding during seed-filling process, v-shaped protuberance is designed on the seed-metering wheel. EDEM discrete element software was used to simulate two kinds of seed-metering wheel with and without protuberance, the simulation results show that the seed-metering wheel with protuberance has better seeding quality and the necessity of the design is verified. The seeding test was carried out on the seed-metering wheel with protuberance in the test bed, and the test results showed that when the designed seed-metering wheel's revolving speed was lower than 50r/min, the qualified seeding rate, re-seeding rate and miss seeding rate met the requirements of NY/T 1143-2006 Technical Specifications of Quality Evaluation for Drills. When the revolving speed of the seed-metering wheel was 40r/min and the speed of the conveyor belt was 0.65m/s, the seeding quality was the best, and the qualified seeding rate, re-seeding rate and miss seeding rate were 78.2%, 10.9% and 10.9%, respectively.