Design and Experiment of Air Suction Seed Metering Device for Alfalfa Plot Breeding
In order to improve the mechanization level of alfalfa plot breeding and sowing,an air suction seed metering device for alfalfa plot breeding was designed.Firstly,seeder structure and working principle are described.Then,the main structural parameters of the metering device are calculated theoretically,and the mechanical characteristics of the metering device during the filling process are analyzed to find the key factors affecting the metering effect.In order to ob-tain the best performance parameters of the seed metering device,the design of quadratic regression orthogonal rotational combination experiments were conducted.The speed of the seeding tray,working pressure and the number of seed suc-tion holes were taken as the test factors.The pass rate,replay rate and missed broadcast rate were taken as the perform-ance indicators,and the regression equation analysis and response surface analysis of the test data were analyzed by De-sign-Expert software.The primary and secondary relationships of each test factor affecting the test indicators were ob-tained.Determine the best combination of seed metering parameters:when the rotating speed of seed metering disc is 24.2 r/min,the number of seed sucking holes is 36,and the working pressure is 3.7 kPa,the rate of qualified is 92.81%,the rate of replanting is 3.35%,and the rate of missed seeding is 3.42%.Through the verification test,the seed metering device can achieve effective seed metering,which provides a theoretical basis for subsequent research and has reference value.
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