Authors

Abstract

In this paper, a small pneumatic vegetable precision seeder suitable for facility greenhouses was designed. Based on the traditional positive and negative pressure seed-metering device, the airway disc structure was designed, and the negative pressure air chamber was divided into three separate air chambers. The separate air chambers could solve the problems of high-pressure requirements of traditional seed-metering device with large air chamber and suitable for small power machineries more. One, two, or three rows drill can be completed by replacing the seed plate and divider. The seed discharge process of the seed-metering device was analyzed and the bench test was performed. Results showed that the required pressure of the seed-metering device with the airway disk was 1 kPa less than traditional seed-metering device with large air chamber when the eligible rate of seed discharge was 95%. Field experiments were performed, results showed that the best performance were achieved under the speed of 3 km/h, for 3.72 % missed, 1.93% repeat and 94.35 % of inner ring, and 5.72%, 1.87% and 92.41% respectively of outer, meeting the requirements for vegetable seeding.

Abstract in Chinese

本文设计了一种适用于设施大棚的小型气力式蔬菜精量播种机，在传统正负压排种器的基础上，设计气道盘结构，将负压气室分为3个独立的气室，解决传统正负压排种器气室大，气压要求高，不适合小动力机械的问题。通过更换排种盘和分种器，可以完成1行、2行或3行蔬菜播种作业。对排种器排种过程进行了分析和台架实验，结果表明，满足排种合格率95%时，带有气道盘的排种器所需气压比传统排种器小1kpa。对设计的小型单盘多行独立气道蔬菜播种机进行田间试验，结果表明：播种速度为3km/h时，播种效果最佳，此时内圈漏播指数为3.72%，重播指数为1.93%， 合格指数为94.35%；外圈漏播指数为5.72%，重播指数为1.87%，株距合格率为92.41%，满足蔬菜播种要求。