新型大行程高承载力的柔性铰链设计

Design of New Flexible Hinge with Large Stroke and High Bearing Capacity

针对传统柔性铰链在行程、承载力性能方面的不足,难以实现柔性铰链较大的移动范围,课题组提出了一种新型TLET柔性铰链。它是由一系列LET型柔性铰链串并联组成,采用独特的布置方式以增强柔性铰链的移动范围,在安全可靠的工作条件下实现大位移和大承载能力。采用等效成弯曲弹簧的方法推导出等效刚度模型,运用有限元分析的方法对3种材料的柔性铰链进行失效形式分析,从中选出高性能的合适材料。对比了所设计的新型铰链和传统铰链的性能,通过有限元仿真验证了新型柔性铰链设计的可行性。仿真结果表明:对于40 N的最大载荷,铰链沿x轴的最大位移为21.68 mm,z轴方向上的最大位移为25.12 mm,新型铰链的移动行程比传统铰链大1.8倍。文中所设计的铰链可用于工作行程大,负载能力高的机械装备中。

Considering that the shortage of the traditional flexure hinge in the aspects of stroke and bearing capacity,which results in the difficulty in realizing the larger moving range of flexure hinge,a new TLET flexure hinge was proposed.It was composed of a series of let-type flexure hinges in series and parallel.The unique arrangement was used to enhance the movement range of the flexure hinges.The proposed flexure hinges can achieve large displacement and large bearing capacity under safe and reliable working conditions.The equivalent stiffness model was derived by using the method of equivalent bending spring and the failure mode of flexure hinges of different materials was analyzed by using finite element method,then the suitable materials with high performance were selected.The performance of the new hinge was compared with that of the traditional hinge,and the feasibility of the new flexible hinge design was verified by finite element simulation.The simulation results show that for the maximum load of 40 N,the maximum displacement of the hinge along the X-axis is 21.68 mm,and the maximum displacement along the Z-axis is 25.12 mm.The moving stroke of the new hinge is 1.8 times larger than that of the traditional hinge.The designed hinges can be used in mechanical equipment with large working stroke and high load capacity.