Research On Multi-functional Nursing Bed

As population aging is more and more serious,the question of providing for the aged is becoming an important issue to be faced in the future.As a kind of auxiliary nursing device,multi-functional nursing bed can play an important role in improving the living quality of disabled elderly and disabled people and reducing the labor intensity of nursing staff.The study of multi-functional nursing bed has important practical significance to cope with the population aging.In this paper,the multi-functional nursing bed is designed in a new way to eliminate the disadvantages of current products in defecation and back lifting.Humanized defecation is realized by separating the hard bed and the soft bed of the nursing bed.A kind of more comfortable back-part-lifting movement is carried out by the linkage of back board,waist board and seat board.On the basis of structure design of the nursing bed,kinematic and dynamic analysis of back-up-lifting mechanism is mainly researched.The main contents of this paper are:1.The design of overall scheme and detail features of the multi-functional nursing bed.The humanized defecation plan is worked out.To realize this plan,the motion mechanism and detail features of bed lifting,automatic separation and contact between hard bed and soft bed,open and close of defection board,lift and fall of feces container are designed.Besides,the hard board is divided into several parts and the back-up-lifting mechanism as well as leg bending mechanism is designed and selected to meet the demand of lying and sitting shift.2.Parameters design and kinematic analysis of back-up-lifting mechanism.A parameterized model of back-up-lifting mechanism is established in ADAMS.By referring to ergonomic chairs,the length of rods and the position of joints are determined.Therefore,a set of complete parameters of the mechanism is got.Then,the kinematic simulation of virtual prototype of the mechanism is carried out and the results of the simulation show several smooth plots of key boards,which identify the validity of the mechanism.Next,kinematic model of the mechanism is modeled.The kinematic numerical simulation is carried out in MATLAB.And the comparison of the two simulations both in MATLAB and ADAMS proves the correctness of the kinematic model and the validity of the numerical simulation.This paves the ground for post research.3.Optimal design on back-up-lifting mechanism based on kinematics.The back-up-lifting mechanism is divided into three parts and every part is designed in MATLAB with optimization.In this optimization,the variables are the length of rods and the position of joints and the target is the movement feature of key boards.After that,kinematic simulation is carried out.In contrast with the simulation of non-optimal parameters,the simulation with optimal parameters performs better.Next,the motion of the driving slider is divided into three stages and the time of every stage is determined with optimization so as to make back board performs best.The validity of the optimal method is verified by comparing the simulations before and after optimization.4.Dynamic analysis of back-up-lifting mechanism.Dynamic model of back-up-lifting mechanism is modeled.Then,dynamic simulation is carried out in MATLAB and the plots of driving force and driving power are got,which provides parameter guidance for the selection of driving device and the design of mechanism controller.