Protective cabin door of rotatable detection radar of blast furnace, protective cabin and protective method

The protective cabin door adopts a double-layer cabin door structure of an outer cabin door and an inner cabin door, so that the direct contact area with an external high-temperature environment is reduced, the service life of the detection radar is prolonged, and the detection radar can be partially or completely shielded by the right outer cabin door; a flexible closed track is introduced into the inner cabin door, the detection radar is closed to rest, the detection radar is totally closed, and equipment in the cabin is prevented from being eroded by complex environment in the furnace. The protection cabin comprises a protection cabin door, a rotating mechanism and a detection radar, the angle of the detection radar is adjusted under driving of the rotating mechanism, the protection cabin door is matched with the detection radar, high-quality isolation of the internal environment and the external environment of the protection cabin is achieved, and the service life of the detection radar is prolonged. When