Design and experiment on precise sowing depth control system of large-scale rice planter
Aiming at the problem of difficult operation control of large rice planter due to the uneven surface of paddy fields,a precise planting depth control scheme applied in paddy field is proposed.The system of the planter is composed of a floating ship sensor,an electric proportional control valve group,a lifting angular sensor,a control device and a burying device with a floating plate.Firstly,a profiling control system based on the floating ship sensors is designed.The system acquires paddy field information through the floating ship sensors and converts it into PID arithmetic unit.Secondly,the PID arithmetic unit of the electro-proportional control valve group is used to control the tilling depth of the seeder.Finally,the buried floating plate achieves the precise burying depth of rice by shaping the paddy field after sowing.The experiment result shows that when the driving speed of the seeder is less than 0.67 m/s,the wide seeder can follow the floating ship sensor to realize profiling,so as to ensure that the seeder ditcher does not separate from the paddy field surface and does not fall into the mud too deep.The test result shows that when the average seed burial depth is controlled at 20 mm±10 mm,the qualification rate of buried depth reaches 96.7％,and the hydraulic oil temperature of the tractor with open center hydraulic system is reduced.
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