旋转式水稻插秧机移箱机构耐磨损设计

Design of Wear-resitance Seeding Feeder Mechanism of Rotary Rice Transplanter

相对于曲柄摇杆乘坐式水稻插秧机,旋转式水稻插秧机速度提高了1倍,移箱机构速度和秧箱质量增加,使双螺旋轴滑道两端冲击载荷增加了5倍,滑块和双螺旋轴两端滑道磨损严重。为了减小磨损和冲击,在双螺旋轴两端配置缓冲弹簧。通过建立滑道、滑块的运动学和动力学模型以及编写优化程序,得出双螺旋轴两端回转槽优化曲线和缓冲弹簧弹性系数。优化后,在缓冲弹簧的作用下滑块与双螺旋轴两端滑道的作用力显著减小,使采用尼龙替代优质钢材加工双螺旋轴具有可行性。对各种尼龙材料和钢材加工的双螺旋轴和滑块进行了耐磨性对比试验。试验结果表明,耐磨尼龙66双螺旋轴和45号淬火钢滑块能够满足插秧机的工作寿命要求。

Compared to crank-rocker riding rice transplanter,the speed of rotary rice transplanter is doubled.In addition,the force impact on the ends of the rotative phase of double helix axis are five times stronger with the quality of feeder moving mechanism and rice seedings box is added.So the abrasion between the slider and the slide is more serious.In order to reduce the abrasion and impact,buffer springs were equipped to both ends of the double helix axis.By setting up the kinematic and dynamic models of slider and slide and writing the optimizing program,the optimal curve in rotative trough at both ends of the double helix axis and the stiffness coefficient of the buffer spring were obtained.After optimization,the force between the slider and the slide were cut down observably referring to the buffer spring added to both ends of the double helix axis,which maked the use of nylon material instead of rolled steel to produce double-helix axis feasible.Nylon materials and rolled steel were used to produce double-helix axis and slide,then comparison experiments of attrition resistance were carried out.The result of the experiments indicated wear-resisting nylon 66 double-helix axis and quench steel No.45 could conform to the rice transplanter＇s working longevity.