Objective To design a new type of turnover mechanism composed by gear train according to the requirement of the function and design of turnover mechanism. Methods The dynamic model was established using the Adams software and the simulation analysis was conducted to obtain the corresponding dynamic curves and the motion pattern. Results The optimized result indicated that, when the rotational speed of the turnover mechanism reduced by 1 r/min, the contact force of the bullet against the roll-over stand reduced by about 5 N, and the radial force of the turnover mechanism against the bullet reduced by about 1 N. Reasonable reduce of the speed and the contact stiffness coefficient of the turnover mechanism can effectively improve the stability of the turnover mechanism. Conclusion The results showed that the Adams software can provide accurate prediction of motion pattern for multi-body mechanism.