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柔性传动结构在微创手术器械中有着越来越多的应用,由于其结构的复杂性,很多时候难以通过理论计算分析结构的力学性能。提出了一种双螺旋柔性传动结构,利用有限元软件ABAQUS对双螺旋结构建立了有限元模型,并分析了核直径、螺距、壁厚百分比及槽底半径对双螺旋结构扭转刚度的影响。结果表明,随着核直径、螺距、壁厚和槽底半径的增大扭转刚度增大,且在其他参数不变的情况下,扭转刚度随着壁厚百分比基本呈线性变化,这在双螺旋结构的设计中具有重要指导意义。
Flexible transmission structure has more and more applications in minimally invasive surgical instruments. Due to the complexity of its structure, it is often difficult to analyze the mechanical properties of the structure through theoretical calculations. A double helix flexible transmission structure is proposed. The finite element model ABAQUS is used to establish the finite element model of the double helix structure. The influence of the core diameter, pitch, thickness percentage and groove bottom radius on the torsional stiffness of the double helix structure is analyzed. The results show that the torsional stiffness increases with the increase of core diameter, pitch, wall thickness and groove bottom radius, and the torsional stiffness changes linearly with the percentage of wall thickness under the condition of other parameters, Structure design has important guiding significance.