电驱式玉米膜上直插穴播机前进速度补偿机构参数优化

Parameters Optimization of Speed Compensation Mechanism of Electric Driving Maize Planter with Dibbling on Membrane

为提高电驱式玉米膜上直插穴播机膜孔合格率和播种深度合格率,对前进速度补偿机构和限深机构进行了计算,应用Matlab仿真前进速度补偿机构各参数对穴播轨迹的影响,筛选出主曲柄角速度、中心距和副曲柄长度对膜下播种深度合格率和膜孔合格率影响较大;采用三因素三水平响应面法进行多因素方差分析,结果表明:影响播种深度合格率的因素主次顺序为:中心距、副曲柄长度和主曲柄角速度;影响播种深度合格率的因素主次顺序为:副曲柄长度、主曲柄角速度和中心距;以播种深度合格率为主,兼顾膜孔合格率最大为优化目标,优化结果为:当主曲柄角速度为89.10 rad/s、中心距为58.55 mm、副曲柄长为95.1 mm时,播种深度合格率和膜孔合格率的5次均值分别为94.89%、93.61%。试验表明前进速度补偿机构运行平稳可靠,试验效果满足玉米播种机相关标准要求及甘肃省玉米播种农艺要求。

To increase the qualified rate of sowing depth and the qualified rate of film hole for electric driving maize planter with dibbling on membrane,forward speed compensation device and limited depth mechanism were calculated. With Matlab impact of parameters of speed compensation mechanism on dibbling trajectory were simulated. Screening out that crank angular velocity, center distance and assistant crank length have significant impact on qualified rate of sowing depth and the qualified rate of film hole. According to response surface method with 3 factors and 3 levels,multi-factor variance analysis was conducted. Results showed that influence on the qualified rate of sowing depth was order,center distance,assistant crank length and crank angular velocity,and influence on qualified rate of film hole was order,assistant crank length,crank angular velocity and center distance. To get maximizing the qualified rate of sowing depth and the qualified rate of film hole,optimal parameters was that crank angular velocity was 89. 10 rad/s,center distance was 58. 55 mm,and assistant crank length was 95. 1 mm. Under that condition,the qualified rate of sowing depth and the qualified rate of film hole respectively was 94. 89%,93. 61%. Test process showed that speed compensation mechanism run smoothly and reliably, and results met standard requirements related to seeder and agricultural requirements for maize planting in Gansu.