工业平缝机刺布挑线机构的平衡优化设计

Balance analysis and optimization design of needle bar and thread take-up mechanism in industrial flat sewing machine

随着科学技术的发展,工业缝纫机日益向高速、高效、精密和自动化等方向发展.为了满足内部结构静动态特性的要求,针对高速工业平缝机中产生振动的关键机构——刺布挑线机构,应用复矢量法推导出了该机构的总质心轨迹方程以及总惯性力方程,并通过平衡分析对零件进行了结构优化,还使用MATLAB对优化前后的机构进行了对比分析从而证明该优化方案的可行性.优化结果表明,该优化方法部分地平衡了刺布挑线机构在高速运转中所产生的强惯性力,有效地改善了高速平缝机整机的动态性能.

With the development of science and technology, the high speed, efficient, precise and automation are becoming the trend of modern industrial sewing machine. In order to meet the requirements of the static and dynamic characteristics of internal structure, applying the complex vector method to derive the overall centroid trajectory equation and the total in- ertial force equation of the needle bar and thread take-up mechanism which generates the main vibration in high speed industrial sewing machine, optimizing the structure of parts through the balance analysis and using MATLAB for comparative analysis to prove the feasibility of optimization design. The optimization results show that the optimization method partly balances the strong inertia force which generates from the needle bar and thread takeup mechanism and effectively improve the dynamic performance of high speed industrial sewing machine in high speed operation.