Authors

Abstract

In the process of revegetation of degraded grassland by pneumatic seed sprayer, the working parameters of the sprayer, such as the position of the sprayer and the air velocity of the inlet of the sprayer, have an impact on the uniformity of spraying. In this paper, 4BQD-40C pneumatic sprayer is taken as the research object. The influence of the compensation mechanism on the airflow velocity at the inlet of the barrel nozzle and the spraying quality is analyzed. The conclusions show that: (1) The planting trajectory of the sprayer inlet compensation mechanism is analyzed, and the planting trajectory equation is obtained, which lays a foundation for subsequent research. (2) The influence law of the opening height on the inlet airflow velocity of the nozzle is obtained, and the drop trajectory is adjusted by adjusting the inlet airflow velocity of the nozzle, and the area of the missed seeding area is reduced. (3) The time points of opening height adjustment and reset of the compensation mechanism in one cycle were obtained. At the same time, there is a lag time t1 due to changing the seed drop trajectory by adjusting the nozzle inlet airflow velocity. Due to this lag time, the compensation mechanism can be used to change the seed drop trajectory when the swing frequency is less than 7.3 min-1 to achieve optimization of the reseeded and missed seeding areas.

Abstract in Chinese

气力喷播机对退化草地进行植被修复的过程中，喷播机的工作参数，如喷播机姿态和喷筒入口气流速度对喷播均匀性均有影响。本文以4BQD-40C型气力喷播机为研究对象，分析安装喷筒补偿机构后喷筒入口气流速度对喷播质量的影响。结论表明：(1)分析了喷播机喷筒入口加装补偿机构的落种轨迹，得到了落种轨迹方程，为后续研究奠定基础。(2)得到了补偿机构开口高度对喷筒入口气流速度的影响规律，并且通过调节喷筒入口气流速度，调节落种轨迹，减小漏播区域面积。(3)得到1个周期内补偿机构开口高度调节的时间点与复位的时间点；同时由于通过调节喷筒入口气流速度改变落种轨迹时存在滞后时间t1，受限于该滞后时间，当摆动频率小于7.3 min-1时，可通过补偿机构改变落种轨迹，实现对落种区域重播、漏播面积的优化。