The protective cover of the Zhaoqing automatic sorting machine is made of nylon leather, plastic fabric, or synthetic rubber that is folded, sewn, or hot pressed into a retractable protective cover. It is supported by PVC sheets and can withstand heat, oil, and coolant, with an instantaneous contact temperature of up to 2000 ℃. It is supported by an insulated support plate. The travel speed can reach 100m/min, and according to user requirements, the accordion style guide rail protective cover can be equipped with stainless steel sheets on the production plane wind box, as well as circular, hexagonal, octagonal and other shapes.