单自由度八杆起背机构的设计与研究  

Design and Research of an Eight-bar Back Lifting Mechanism with Single Degree of Freedom

作　　者：孙学斌 俞成涛 潘澳 顾铖 黄光铭 Sun Xuebin;Yu Chengtao;Pan Ao;Gu Cheng;Huang Guangming(School of Mechanical Engineering,Jiangsu University of Technology,Changzhou 213000,China)

机构地区：[1]江苏理工学院机械工程学院,江苏常州213000

出　　处：《机械传动》2023年第3期49-56,共8页Journal of Mechanical Transmission

基　　金：江苏省重点研发计划-社会发展面上项目(BE2018641);江苏省青蓝工程优秀青年骨干教师项目;江苏省研究生实践创新计划项目(SJCX21_1316);江苏省中以产业研究院开放课题(JSIITRI2020001)。

摘　　要：为提高可分离式护理床椅的舒适性与稳定性,设计了一种新型单自由度八杆起背机构。首先,结合人机工程学,以背部滑移量及滑移速度为参数,验证了腰背结合型背板相比传统单板型背板的起背运动更加符合舒适性的要求;其次,建立起背机构的运动学模型,并基于Adams软件对机构进行参数化建模,分析了各部件对起背过程中背板最大角加速度变化的灵敏度,以背板角加速度最大值最小为目标对机构关键尺寸进行了优化;然后,根据优化结果,应用SolidWorks建立机构的三维模型,并使用Adams与Workbench联合仿真,验证了机构的强度合理性;最后,制作实物样机,验证了机构的可行性。In order to improve the comfort and stability of the separable nursing bed-chair,a new type of eight-bar back lifting mechanism with single degree of freedom is designed.Firstly,combining with ergonomics and taking back slip and slip speed as parameters,it is verified that the back lifting motion of the combined lumbar-back backing plate is more comfortable than that of the traditional single-plate backing plate.Secondly,the kinematics model of the backing mechanism is established,and the parametric model of the mechanism is established in Adams software.Based on this model,the sensitivity of each component to the change of maximum angular acceleration of backing plate during backing process is analyzed,and the key dimensions of the mechanism are optimized with the goal that the maximum angular acceleration of backing plate is the minimum.Furthermore,according to the optimized result,the 3D model of the mechanism is built using the SolidWorks,and the rationality of the mechanism strength is verified by the joint simulation of Adams and Workbench.Finally,a prototype is built to verify the feasibility of the mechanism.

关 键 词：起背机构 八杆机构 参数优化 ADAMS软件 有限元分析 

分 类 号：TH789[机械工程—仪器科学与技术]