The purpose of this design is to design a tray Automatic switching device ,(APC) which is often used for machining center. The agency should realize the automatic exchange and tray transmission, and complete the exchange between the machining and already machining of automatic. The method is refering material, analysing the domestic and international situation and designing and calculating the tray switch and their accompanying fixture structure design .And finally, using the calculated results rendering the tray of assembly drawings exchange organization, and the accompanying jig drawing and transportation agencies and some important parts of the assembly drawing. This design has finally achieved the raising and decline of the tray so as to make the tray of clamping fixture and drive the exchange between the already processing and unprocessing parts, and realize the automatic tray of axially symmetrical taut and the sliding sets on the fixed. This design specifications, drawings, parts drawing and hydraulic figure have described the institutions of the working principle and the whole design of the shield in detail.
Key words: Flexible; Trays; Fixture; Accompanying; System