In the erected circular medicine-chest

mechanical structure and working principle are analyzed

noninterference moving condition of reserving medicine basket is discussed with different phase

optimum function of chain drive based on noninterference moving condition is ascertained and solved by using Matlab

the minimum circular radius of reserving medicine basket and design parameters of chain drive are finally obtained.For keeping reserving medicine basket horizontally running

guides of balance bar are rationally located.The motion simulation model is set up with using PRO/E and RecurDyn.Motion simulation is carried out to prove the success of optimum design based on the noninterference moving condition of reserving medicine basket.The whole system development has been completed and applied in the outpatient-service pharmacy.It runs well now.