多功能护理床起背机构创新设计及运动分析

Design and motion analysis of backpart-lifting mechanism of multifunctional nursing bed

针对现在多功能护理床起背过程中存在摩擦皮肤、病人容易滑落、腰部存在支撑盲区等问题,基于人机工程学原理,设计了一种八杆单自由度起背机构,并构建了该系统运动学模型.通过参考座椅的人机工程学尺寸,选取和确定了机构完整的参数,并以此为依据,分别进行了MATLAB数值仿真和ADAMS虚拟样机的仿真,得到了各板的运动曲线图,通过比较验证了运动学模型构建的正确性;并且各板运动曲线光滑平缓,无速度、加速度突变,证明了起背机构设计的合理性.该研究可为多功能护理床的研发提供参考.

Based on ergonomics,a backpart-lifting mechanism with eight member bars and one free degree is designed to eliminate the disadvantages of current backpart-lifting. The disadvantages include skin friction,easy slip of patients,blind areas of the support of waist. The kinematic models of the mechanism are modeled. By referring to ergonomic chairs,a set of complete parameters are determined. With these parameters,kinematic simulations are carried out both in MATLAB and ADAMS environment. And the comparision of kinematic graphs gotten from the simulations proves the correctness of kinematic models. Also,the validity of this design is verified by the smooth variation of curves in the graphs. The research provides references for the development of multi-functional nursing bed.