Optimization and Testing of Mechanical Roller Seed Discharge Device Based on Edem Rice Potting Tray

Abstract

To improve the high-speed sowing effect of the mechanical drum seed metering device in rice plug trays, this paper optimized the size parameters of the seed filling opening based on EDEM discrete element simulation. In this study, three rice seeds, Y Liangyou 1998, Shen Liangyou 5814, and Yi Xiangyou 1108 were used as test objects, the characteristics of the materials were analyzed, and the rice simulation model of EDEM simulation software was generated based on SolidWorks 3D design software, and simulation experiments were carried out. Design-expert data analysis software was used to analyze the simulation results, establish a seed filling port optimization regression equation, and explore the optimal solution of the seed-filling port parameters when the seed filling rate is determined. It is concluded that the chamfer angle of the seed filling port of the seeding roller optimized with Y Liangyou 1998 rice seeds is 45.06°, the radius of the fillet is 7.12 mm, the length of the seed filling port is 13.51mm, and the predicted seed filling rate is 98.58%. The seed filling port of the seeding roller optimized using Shen Liangyou 5814 rice seeds has a chamfer angle of 46.69°, a fillet radius of 7.07 mm, a filling port length of 14.54 mm, and a predicted seed filling rate of 98.28%. The seed filling port of the seeding roller optimized by Yi Xiangyou 1108 has a chamfer angle of 45.69°, a fillet radius of 7.05mm, a seed filling port length of 15.41mm, and a predicted seed filling rate of 98.53%. Conduct special seeding tests and general seeding tests on the seeding roller. The test results show that when seeding rollers corresponding to each type of seed are used for sowing, the overall seeding uniformity remains above 66%, the overall seeding qualification rate remains above 96%, and the overall seeding miss rate is lower than 1.3%. Using the seeding roller optimized for the largest seed size, the overall seeding uniformity of the three types of seeds remains above 65%, the overall seeding pass rate remains above 95%, and the overall missed seeding rate is less than 1.3%. Among them, the maximum seeding uniformity is 67.12%, the minimum seeding miss rate is 0.68%, and the maximum seeding qualification rate is 98.33%. The EDEM-optimized mechanical roller seeding device for rice plug trays meets the requirements for high-speed and precise seeding of rice plug trays.

Keywords: Keywords: Rice, High-speed, Hole tray, EDEM, Seed filling port