槽缝气吸式小麦精量排种器

Slot-type Pneumatic Precise Wheat Seed-metering Device

摘要:

设计了一种槽缝气吸式小麦排种器。通过试验对比分析了梯形、U形、V形以及“1”字缝隙式槽缝结构的排种器吸种均匀性，梯形槽缝式排种器的吸种变异系数最小，为7.0%，排种种子破损率小于0.30%，满足小麦精量播种的要求。但是由于在实际作业时，风机负压的波动，各缝隙处的气流吸力的差异，致使该排种器的各行排种量一致性没有提高，在不同变速情况下各行排种量的变异系数不大于4.4%。

Abstract:

A kind of trapezoidal slot-type pneumatic wheat seed-metering device was designed. Through experiments, the sucking seed uniformity of the seed-metering device with trapezoidal, U-shape, V-shape slot-type and the straight slot-type was analyzed. The experimental data showed the variation coefficient of the seed metering device with trapezoidal slot-type was the smallest, which was 7.0%, and the seed breakage rate was lower than 0.30%. These data conformed to the requirement of wheat precise seeding. But in the actual operation because of undulation of negative pressure of the wind machine and difference of air current suction in each row slot-type, the consistency of each line seeding quantity of the seed-metering device was not improved. Its variation coefficient was not more than 4.4% in the different speed change situations. 