方草压捆机D型打结器驱动齿盘重建与优化

Reconstruction and optimal design of driving dentate disc of D-bale knotter based on reverse engineering

中国目前方草压捆机打结器主要依赖进口,而进口打结器驱动齿盘由于凸轮工作曲面连续性差、未达静平衡,易使驱动齿盘磨损,影响打结器工作稳定性,不能满足秸秆高速打捆要求。该文针对这一问题,基于逆向工程原理,以Imageware和pro/E软件为工具,优化设计了一种曲面质量高、传动平稳的配重式驱动齿盘。驱动齿盘凸轮槽工作面曲面连续性和等值面分析结果表明,优化后的配重式驱动齿盘凸轮曲面位置偏差为0.0013～0.0037mm,切率变化为0.1393°～0.1400°。曲面曲率变化连续,弦偏差为0.100mm,达到A级曲面要求。凸轮曲面配合零件工作平稳,可有效保证打结作业时序。齿盘平衡检测结果表明,设计的配重式驱动齿盘静平衡性能高,可以满足我国收获时节大秸秆量下高速打捆的要求。

Driving dentate disc is the power source of mechanical bale knotter.The bale knotters used in domestic mostly depend on imports and the knotters could not meet the requirements of high-efficient straw belting due to the unstable working status caused by un-smooth cam working surface of driving dentate disc and discontent with static equilibrium.This paper took the D-twine knotter as the research objective and optimal designed a weight driving dentate disc with the features of high surface quality and stable transmission based on the theory of reverse engineering.Through the analysis of the working principle of D-twine knotter,the paper reconstructed the 3D driving dentate disc and optimized its surface and structure with the Imageware and Pro/E software.The analysis of multi-surface continuity and surface contour of driving dentate disc showed that after the optimization of weight driving dentate disc,its surface position deviation and change rate of tangent were 0.0013-0.0037 mm and 0.1393°-0.1400°,respectively.The change of surface curvature was continuous and the chord deviation was 0.100 mm,indicating the disc surface met the requirements of A-class surface.Furthermore,the parts matched with disc surface worked steadily,which ensured the operation order in straw-belting.The new center of the disc was about（2.87,0,0）mm,which reached the requirements of static equilibrium and could meet the requirements of high-speed belting in heavy straw cover fields in harvest season in China.