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以研究适合大田生产的气吸式小麦单粒精密播种机为目标 ,改进了用于小区播种的组合吸孔式排种器的结构 ,采用三段圆弧构成螺旋吸槽的曲线方程 ,分析了种子在此曲线方程上的运动学和动力学特性 ,从理论上描述了组合吸孔完成吸种、清种和输种的全过程 ,认为组合吸孔具备清种功能的原因在于组合吸孔的运动速度、面积和形状的变化 ,种子在吸种区内受到的种子之间的内摩擦力是最大外力 ,从而确定了组合吸孔式排种器吸室临界真空度的计算方法。
In order to research the air-suction wheat single-precision seed sowing machine suitable for the field production, the structure of the combined hole-type seed metering device for the sowing of the plot was improved. The curve equation of the helical suction groove formed by three arcs was analyzed. The kinematics and dynamics of the seeds on this curve equation describe the whole process of aspiration, seeding and transfusion of the combination aspiration wells theoretically. The reason that the combination of aspiration wells have the function of seeding is that the combination of aspiration The change of the moving speed, the area and the shape, and the inner friction between the seeds in the suction zone are the maximum external forces, so as to determine the calculation method of the critical vacuum of the combined suction hole seeder.