二阶自由非圆齿轮行星系钵苗移栽机取苗机构

Seedling Pick-up Mechanism of Planetary Gear Train with Two-order General Non-circular Gears

摘要:

为满足旱田钵苗移栽取苗机构理想鹰嘴形工作轨迹要求，提出了连续传动的二阶自由非圆齿轮行星轮系取苗机构，以实现取苗爪周期性二次不等幅摆动规律。利用曲线拟合方法构建自由传动比函数，建立机构不等速传动的数学模型，编写机构分析软件，确定传动比函数和机构参数，研制取苗机构并进行了高速录像试验。结果表明，该型取苗机构的工作轨迹和理论计算吻合，能够实现取苗深度35mm，取苗爪在钵体中穴口小于5mm，取苗爪入钵和出钵段姿态满足工作要求。

Abstract:

In order to meet the requirements of dryland pot seeding transplanting mechanism, which need to achieve ideal “olecranon shaped” track, a continuous transmission seedling pick-up mechanism of planetary gear train with second-order general non-circular gears was proposed so as to achieve the seedlings claw periodic secondary unequal amplitude swing. The curve fitting method was utilized to build free transmission function, and a mathematical model about non-constant velocity drive of mechanisms was established, The mechanism analysis software was compiled, and the transmission ratio functions and mechanism parameters were determined to manufacture the seedlings transplanting mechanism. The high speed video test was carried out, The results showed that the seedlings test trajectory could agree well with theoretical calculations. The depth of taking seedlings was deeper than 35mm, and the scoop of pot was less than 5mm. The posture of seedlings claw met the job requirements during plunging into pot and quitting pot process.