Research On Cylinder Precision Seeder With Functions Of Reseeding Based On The Pneumatic Suspension Seed Supply

Tray-soilless seedling planting was one of the key links in the implementation of seedling transplanting, and tray seedling seed metering device was the core component of tray seedling precise seeder. Tomatoes, vegetables, flowers and seeds due to the small particle size, shape, irregular, and the characteristics of poor liquidity, directly caused the existing air-suction seedling metering device to take kind of poor precision and application promotion. In order to solve this technical problem, starting from improving liquidity position by adsorption space instant of seed,we put forward new ideas blowing in the area several times to bring seed for replanting suspension, we design cylinder precision seeder with functions of reseeding based on the pneumatic suspension seed supply.Specific research is as follows:structure design of cylinder precision seeder with functions of reseeding based on the pneumatic suspension seed supply:we design structure of the overall program and key components, clear structure principle,which Lay the foundation for future study.We took theoretical analysis of adsorption and seeding process of cylinder precision seeder and build a model to obtain the seeds are adsorbed by the drum suction holes into the carrying out of seed zone conditions. Established the metering error, seed contact with the hole tray moments of impact velocity and impact Angle and other mathematical model, and analyses the influence factors of them, to determine the parameters of metering device adsorption to take effect.We used fluent6.3.26 simulation software for the roller structure parameters of the flow field analysis and simulation, the simulation analysis results: straight hole take kind of better performance than the horn hole and sink holes, because outside horn hole and sink holes at the exit of sectional area is larger, so the structure of the suction hole shape of the metering device to take effect to test the influence of performance; Suction hole lead air convection field only have the effect of adjustment and stable pressure;As suction gas flow increases with the increase of hole diameter, ability enhancement, take the kind of the better the results.Maked experimental apparatus of cylinder precision seeder with functions of reseeding based on the pneumatic suspension seed supply. First of all, in a box under the condition of single is being supported kind of adsorption seed metering device performance index(single grain index, replay and leak seeding index) of the three main factors(drum rotating speed, the positive pressure air chamber, vacuum) design of orthogonal test, by SPSS statistical analysis software analysis on test results are very poor, Obtained the impact of various factors on the performance index and secondary order and the best combination of factors level, Through the analysis of variance, to confirm the influence degree of various factors on the performance index, comprehensive analysis of final effect drum performance index of metering work best parameter combination: vacuum degree was 3.0 kPa, roller speed of was 16 r/min, the positive pressure air chamber was 2 kPa.Through the metering device in a box under the condition of single is being supported kind combination level of the best work parameters, change is being supported kind of box layer suction pore structure parameters and orthogonal experimental study again,Comprehensive of range analysisand analysis of variance, we ultimately determined the kinds of multistage send fresh level of kinds of factors that affect performance index under the condition of the best parameter combination for: suction hole diameter is 1.5 mm, suction hole shape for the speaker hole, a case is being supported kind layer number is 2.