Manufacturing and assembling process: Raw materials: L.Aluminum-plastic plate(铝塑板)： Specifications:1.5m*1m*0.35cm; Source:purchased parts Used as the raw materials of the box. 2.groups of plastic foldable brackets: Specifications:18cm in length and 6cm in width when folded;50cm in length and 6cm in width when expanded. Source:purchased Used as the brackets(elevator)of the mechanism 3.bolt.shim,nut and the hinge:Manufacturing and assembling process: Raw materials: 1. Aluminum -plastic plate (铝塑板): Specifications:1.5m*1m*0.35cm; Source:purchased parts Used as the raw materials of the box. 2. groups of plastic foldable brackets: Specifications:18cm in length and 6cm in width when folded;50cm in length and 6cm in width when expanded. Source: purchased Used as the brackets(elevator) of the mechanism 3. bolt,shim,nut and the hinge: