液态施肥机液肥分配器凸轮运动学分析与仿真

Kinematic Analysis and Simulation of Liquid Fertilizer Distributor's Cam for Liquid Fertilizer Applicator

应用Visual Basic 6.0软件对液态施肥机全等椭圆齿轮行星系扎穴机构喷肥针尖点的运动学方程进行编程,获得针尖点位置的y分量图像和静轨迹。然后根据喷肥针入土时的施肥要求和分配器工作原理,确定分配器凸轮各阶段的运动角和分配阀阀芯的运动规律,并选定阀芯行程为10 mm。在VB中编程获取凸轮的轮廓曲线并进行其压力角和曲率半径验证,运用Pro/E软件对凸轮和分配器进行三维建模和运动学仿真,得到阀芯在一个运动周期内的位移、速度和加速度图像。通过试验对此装置的每次施肥量进行测定,结果表明每次施肥量达到要求,所设计的凸轮符合工作要求。

Using Visual Basic 6.0 software, the kinematics equations of the spray fertilizer needle tip point of fertilizer applicator＇s planetary pricking hole mechanism with congruent elliptic gears was programmed. The y-component image and static trajectory of the needle tip point＇s location was got. Then, according to the fertilizer requirements when spray fertilizer needle buried and distributor＇ s working principle, the movement angle of distributor＇ s cam and the motion law of distributor value＇ s spool were determined. The spool travel was selected as 10 mm. The cam＇ s profile curve was got in VB and the pressure angle and radius of curvature were verified. The Pro/E software was used for 3-D model and kinematics simulation of the distributor and cam. The displacement image, speed image and acceleration image of spool within a movement cycle were got. Each fertilization volume of this device was measured through the test. The results showed that the each fertilization volume reached the required value and meet the job requirement.