Design and analysis of six-link mechanism for wheelchair bed's posture transformation
In this article,in order to provide convenience for more senior citizens'daily life,a wheelchair bed with simple structure,low cost and mobility function is designed.According to the principle of posture transformation,the parallel four-link mechanism suffers the poor cantilever structure of the leg bed plate.In this article,a six-link mechanism which ensures bed-wheelchair posture transformation is proposed.It aims to improve the force on the leg bed plate by utilizing the dead center posi-tion of the linkage device.By analyzing the geometric relationship among the linkage components with initial posture,the parame-terized mathematical model is set up and solved in the MATLAB software,so as to work out the dimensions of each component.Finally,the ADAMS software is used to build the model of the linkage components'virtual prototype,and then the motion analy-sis is performed.The adjustment range of the mechanism's posture transformation is measured,and the results meet the design requirements.
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