In order to enhance the sufficient effect and the metering quantity of suction seed metering device,the regulative keep-off shade of seed room and the appropriate mechanism structure were designed on the basis of analyzing the structure and basic principle of suction seed metering device.

In order to satisfy the high production cultivation technology of the soybean,a high speed,single plate type suction seed metering device has been developed.

to meet the demand of high-density and high-speed for split-row feed for soybean, we developed one single-wheel, single chamber and high-speed pneumatic feed, that is applicable for single and split row precision drilling for soybean.

The authors did test of drilling performance of soybean for 2QXP high-speed pneumatic feed at the different condition of wheel rotate speed and value of vacuum of chamber, analyzed the rule of effect that the wheel rotate speed and the value of vacuum of chamber do to the drilling performance, and seek out the optimal wheel rotate speed and the value of vacuum chamber.

In this paper, the influencing parameter of working performance of air-suction metering device was analyzed theoretically.

Based on the analysis of working performances of the precision drill, and the teston the seed release performance of blowing-type metering device, the ma jor factors affectingthe seed release performance and the working scope are obtained.

Comparing with the vertical disc air-suction seed metering device which uses generally at present,the cylindric tube air-suction seed metering device structure simply,the torque smaller can .