Network cabinets used in the early days were mostly made of castings or angle steel through screws, riveted connection or welding into cabinet frames, plus cover plates (doors) made of steel sheet. This kind of cabinet has been eliminated due to its large volume, heavy weight and simple appearance. With the use of transistors and integrated circuits and the ultra-miniaturization of various components and devices, the structure of cabinets is also developing towards miniaturization and building blocks. The network Cabinet has developed from the whole panel structure to insert box and plug-in structure with a certain size series. Insert box and plug-ins are arranged horizontally and vertically. Network cabinet materials generally adopt steel sheet, steel profiles with various cross-section shapes, aluminum profiles and various engineering plastics. In addition to welding and screw connection, the frame of network Cabinet also adopts bonding technology.
