Design and test on belt-type seed delivery of air-suction metering device

According to the weakness of the high seed dropping position, the big variability of seed-spaces in soil and the low qualification rate of the double driving discs furrow opener of no-tillage planter, a new belt type seed delivery device was designed and developed. Based on the analysis of the cavitation time of suction seed metering device, the new belt-type seed device combined transmission and dropping seed institutions, which was related with the speed of seed metering device and the speed of planter. Also its main structural parameters were determined. Comprehensive impact factors affected the three test indicators differently, the primary and secondary order of influencing factors for seeding quality was determined, and the results showed that the order was the height of the throwing point, speed of the take seed plate and the suction pressure. The optimum parameter combination was that the height of the throwing point was 100 mm, the speed of the take seed plate was 30r / min and the suction pressure was 3.5kPa. At these conditions, particles away from a pass rate were 98.50%, the leakage sowing rate was 0.48% and replay rate was 1.02%. Through experimental verification, the error of experimental and theoretical results was 0.11%、0.17% and 0.08%, which met the needs of the test requirements. The research provides a reference for further improving quality and optimizing the parameter for air-suction metering device.