双系统中小粒林木种子精量播种机的设计

In order to realize precision sowing of the small and medium-sized tree seeds,which with brittle and hard shell,irregular shape and low sphericity,a precise seeder which based on air blowing and vibration and match seedling trays was designed.Take Pinus sylvestris var.mongolica seed for example,the application of indentation method,inverse analysis algorithms,the Hertz-Mindlin method which from EDEM as model were used to explore the mechanical properties and establish the population spatial configuration model of seed.aerodynamic characteristics,the population spatial configuration model of seed was established,then the key components of precision seeder were designed.The seeder was mainly composed of pneumatic system、electronic control system、seedling trays、seeding mechanism、seeds supply mechanism、punch mechanism、seedling trays conveying mechanism and so on.The seeds supply system was supported by blowing-vibration device,which make seeds group effective separation and flow,keep the seeds movement state such like"boiling",then ensure the seed adsorption process accomplish.Keep the stable movement state of seeds can improve the adsorption rate of the equipment,Through sowing experiment,when the vibration frequency of trays was 20 Hz,and vibration amplitude was 5 mm,and running speed of trays conveying mechanism was 0.045 m/s,the cavity rate was 1.74%,repetitive seeding rate was 0.26%while the qualified rate of sowing is 98%,the sowing efficiency was 300 tray/h.The precision seeder which have strong versatility can match hard conventional seedling trays and paper honeycomb seedling trays.