In order to solve the problem of overstocking and unpacking of goods during express delivery,a variable structure transport vehicle was designed based on analysis of existing container vehicles in this atticle.Based on the theory of metamorphic mechanism,the 2-DOF differential gear train is used to control the load plate of two floors in the carriage.The multi-pole parallel mechanism is adopted to separate different goods.The innovative design of two different opening and closing modes to the door can match the different layers and conveyor belts of the loaders to assist the loading and unload...