Process structure: ① frame body structure of each column Shelves are equipped with brakes on the side of the side panel for easy opening and closing. When open-shelf search for information, simply press the brake handle, frame body would not have been someone else moving, effectively ensure the safety of inspection personnel. ② Shelves fitted with strong magnetic rubber seal between the columns, equipped with dust on top of the plate, the bottom with rodent control devices, seamless joints after total rope, basically do dust, rodents, theft, The light tight requirements. ③ crank and crank the steering wheel using two kinds of style, its tax structure for hanging round prickly thorns claw off the file automatically. When a single lapse, other crank (steering wheel) will not follow the rotation, shake the foldable to avoid traffic barriers, shaking force of not more than 12NX standard section. ④ base structure consisting of welded, assembled portfolio can be segmented, high precision, with docking compatibility, wide range of advantages festival type. ⑤ sheet metal parts, machine parts after machining burr grinding, no cracks and scars, all welded parts welding firm, will not weld, welding wear, holes and other phenomena, uniform surface ripples.