Design and experiment of piezoelectric type vibration air-suction precision seeder with holey tray

On the basis of the combined seeding mode of piezoelectric vibration and air-suction, a new precision seeder was designed for seeding precisely the small size of seeds of trees, flowers, or some vegetables, etc. The structure, drive system and parameters of piezoelectric vibration table were designed, based on converse piezoelectric effect, the micro-displacement produced by piezoelectric actuator were amplified by amplification mechanism, then the seed tray vibration was driven , the internal friction between seeds was overcome and the boiling movement beneficial to seed suction was produced. The seed disk was designed only at 1-2 rows of sucking width with lightweight material and narrow structure, so the suction seed rate increased greatly. Experimental results showed that vibration amplitude was more than 1.31 mm, vibration frequency was 13-55 Hz with adjustable frequency width (the resonant frequency is 25Hz), and the suction seed rate of the precise seeder was more than 98% with vibration intensity of 1.4-1.7. It can meet the precise seeding demands.