关键词: 偏心齿轮, 分插机构, 优化设计, CAD

Abstract:

In view of the requirements of transplanting sparsely of the super rice, a kind of birotary arm type of separating-transplanting mechanism with differential eccentric gear train was presented herein. Angle relationship between multilevel gears round both sides of the center gear in gear box was firstly computed based on inequality model. The center distance of eccentric gear transmission was optimized when the optimization objectives were determined as nonnegative minimal normal backlash of tooth flank and positive bottom clearance. Visual design method of human-computer interaction was used to optimize the parameters of the two-link transplanting-seedling manipulator by taking minimal taking-seedling angle and pushing-seedling angle of the manipulator's claw as optimization objectives, and the results may make the claw of manipulator basically get in and out seedling door along the direction of seedling slope and erectly insert into the soil. The inversion method was used to build up kinematic model of the pushing-seedling mechanism driven by non-uniform planetary gear, and its structural parameters were optimized. Accurate cam contour and its motion relationship of pushing seedling were obtained, and the optimization made cam mechanism have proper pressure angle which theoretically overcome heavier motion impact of shifting fork. Motion simulation shows that optimized parameters are right and can make the separating-transplanting mechanism work well. The separating-transplanting mechanism suits to transplant the seedlings whose heights are less than 352mm when planting distance varies from 200mm to 280mm, and it is especially suitable for transplanting the super rice seedling.

Key words: eccentric gear, separating-transplanting mechanism, optimization design;CAD