Authors

Abstract

To enhance the upright orientation rate of garlic clove bud tips, an air-suction garlic clove directional metering device with a guiding cam was developed. Key parameters influencing garlic clove discharge performance were determined through mechanical analysis. After optimization, the guiding cam's thickness(D) was set at 4 mm, with the lead-in and the seeding section tilt angles(αt,β) of 5° and 15°, respectively. Comparative tests were conducted using optimal parameters, focusing on seed discharge disc rotational speed(n) and negative pressure(P) as main variables, with the upright rate of seeds in the receiving hopper serving as the evaluation index. Under conditions of -11.5 kPa negative pressure and 7 rad/s rotational speed, the upright rate reached 97.2%. Results demonstrated that the addition of guiding cams significantly improved the upright rate, increasing it by over 10% compared to directional metering devices without guiding cams.

Abstract in Chinese

为了提高排种后蒜种芽尖向上直立率低的问题。设计了一种带有导向凸轮的气吸式定向排种器，通过完成蒜种接触导向凸轮过程的力学分析，明确了影响导向排种性能的关键参数。得出导向凸轮厚度为4mm、导入段倾斜角度为5°、投种段倾斜角度为15°。在最优参数组合下进行对比验证试验，排种盘转速（n）以及负压大小(P)为试验因素，落入接料斗直立率为评价指标。增设导向凸轮排种器p为-11.5kPa、n为7rad/s时，落入接蒜斗直立率达到97.8％。稳定吸附时，排种器直立率之差Δ>10％。因此，增设导向凸轮的直立率显著高于不安装导向凸轮。