Design and study on control system of water jet seeder by controlling seed and water respectively

Bunch planting with water jet is a kind of untouched soil planting, which uses high pressure water-jet to form a hole and seed in it. Firstly, the water-jet planting of seed and water controlled separately has been designed. The seeder includes three parts, the equipment of high-pressure water supply, precision seeding system and seed-metering device and controlling system,is a set of mechanics-electronics-hydraulics sowing system. The three parts was put into together in a vehicle, so planting experiment can be easily operated in soil bin. Secondly this paper design the control system of water jet sowing device. The control system with the core of SCM AT89S51 is mainly made up by the photoelectric detection circuit, solenoid valve control circuit, SCM system, keyboard and display circuit, interrupts control system and acousto-optic alarm circuit. To guarantee water-jet and seed-metering in harmony, the course of the work is as follows: when the seed at the blocked plate, the detection circuit detects it, signal to the microcontroller, and then solenoid valve starts controlling water-jet to form a hole. Subsequently, opening solenoid valves which control jet and blocked plate to accelerate seed, and last make the seed into the hole. Finally, an indoor soil bin test was carried out on the viscous soil, data analysis and experiment results show that pressure and the height of sowing position above the ground have great effect on quality of planted.