气力式油菜精量排种系统各行一致性影响要素分析

Sowing-consistency of Pneumatic precision metering device for rapeseed is the key performance indexes of 2BFQ-6 precision seeder for rapeseed.On the basis of structure parameters, operation parameters and its experimental study, this paper was conducted to investigate the factors which affect sowing-consistency of the system.The results showed that the contours of fan flow showed a parabola type, and when outlet size of positve pressure changed from 35 to 40 mm, fan flow could came up to maximum value on different rotational speed.Sowing-consistency of the system was less than 5 percent when rotational speed of planter plate was less than 40r/min and fan flow was less than 140Nm3/h, and it's not food for sowing-consistency on high rotational speed of planter plate and low fan flow or on low rotational speed of planter plate and high fan flow.In a certain range of fan flow and rotational speed of planter plate, the system had good performances on sowing-consintency and seed rate.The conclusion obtained from this article is valuable for structure improvement and parameter matching of 2BFQ-6 precision seeder for rapeseed.