消极式凸轮开口回综涡簧动态设计与仿真

Dynamic design and simulation of return spiral spring on negative cam shedding mechanism

针对直吊式回综弹簧与结构安排之间的矛盾,设计开发了一种回综用非接触型平面涡卷片簧。以JB/T 7366—1994《平面涡卷弹簧设计计算》为依据,构建了基于阿基米德螺旋线型的涡簧CAD实体模型。有限元静动态分析结果表明:涡簧的弹性变形及应力分布符合静力强度设计要求,且涡簧低阶模态频率均小于1 Hz,可有效避开高速凸轮提综运动工作频率。通过柔性涡簧动力学仿真与数据处理,获得了回综涡簧卷紧过程中的刚度特性曲线和储能曲线,为准确计算涡簧反作用扭矩T和储能密度ρ_E提供了重要依据,有助于回综涡簧的动力设计和实践应用。

In view of the contradiction between straight lifting type heald spring and structural arrangement,a non-contact type of flat scroll leaf spring for heald return was designed and developed.A CAD entity model of spiral spring based on archimedes spiral was constructed according to national machinery industry standard(JB/T 7366-1994).The results of finite element analysis with static and dynamic show that elastic deformation and stress distribution of the spring can meet requirements of static strength design,and low-order modal frequencies of the spring is less than 1Hz,which can effectively avoid working frequency of high-speed cam lifting.Through dynamic simulation and data processing of flexible spiral spring,stiffness characteristic curve and energy storage curve of the spring in tightening process were obtained,which provided an important basis for accurate calculation of reaction torque T and energy storage densityρE,which is beneficial to dynamic design and practical application of spiral spring.