Design and test of positive and negative pressure air-suction seed-metering device
In order to solve the problems of seed damage and poor adaptability to seed size of the mechanical seed metering device,an air-suction precision seed metering device was designed.The seed metering device was designed according to the agronomic requirements.Wheat seed was applied for experiments.The single factor test was employed to analyze the effects of negative pressure of seed suction,rotation speed and seeding height on the performance of the seed metering device.And the optimal parameter combination was obtained through the response surface experiments:negative pressure of seed suction was-3.5 kPa;rotaion speed was 19 r/min;and seeding height was 180 mm.The optimized parameters were used for the test,and the final results were as follows:the qualified rate was 80.62%;the replay rate was 9.22%;and the missed rate was 10.16%.Our results suggested that the air-suction precision seed metering device meets the requirements of JB/T—10293-2013 Technical conditions of single seed(precision)seeder.
air-suction seed-metering deviceprecision seedingpositive and negative pressure combinationsingle factor testresponse surface test
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