Performance Parameter Design Of Air-suction Seed Metering Device And Experiment Study Of Effects On Sowing Quality

The air-suction seed metering device is widely used by domestic and foreign, because of itsadvancement and unique superiority as an advanced metering device. But the present working speedof domestic device is generally lower, about 6km.h^-1, comparing to outland. The paper makes massiveexperimental studies aiming at the air-suction seed metering device of vertical disc to improve itsperformance.First of all, the parameters of influencing performance of the device were analyzed in the paper,and the paper considered that the mainly influencing factor is vacuum of suction cell, rotational speedof sowing disc and so on. At the same time its adsorption mechanism was analyzed, and dynamicanalysis of seed was given under press instance.Next, 2QXP-1/2 type air-suction seed metering device, with single disc and two rows, wasdesigned based on the theoretical analysis, and analyzed its working process and the character ofdepart-rowing. Bench test shows that yield rate is over 90% and de-rowing is good, under theappropriate vacuum and 12km/h of work speed conditions.The metering device was tested on test platform, through changing different parameter (rotationalspeed of sowing disc, pressure of vacuum cell and so on). The experiment indicates that the primaryand secondary factor of influencing performance is rotational speed of sowing disc, vacuum pressure ofsuction cell, and obtains the relations between the parameters and eligible rates of the grain distance,the leak-sowing rates and the re-sowing rates. Simultaneously it obtains the regression equations byusing the orthogonal test. it obtains that the best parameters are 0.58r.s^-1 and 0.0035MPa by theregression equations of optimum.