Roller aerosol cooling method and device

A roller aerosol cooling method and a device thereof belong to the technical field of steel rolling process; the cooling medium is the compressed aerosol and the cooling effect is obvious after a roller is cooled with aerosol under the high temperature; the roller temperature does not exceed 50 DEG C after being cooled, therefore, the method and the device can substitute the conventional high-pressure water cooling mode. By adopting the process, high-pressure cooling water and high-pressure gas are respectively delivered to the place above the roller through a high-pressure cooling water pipe and a compressed gas pipe and the high-pressure gas in the compressed gas pipe is used for converting the high-pressure cooling water into mixed high-pressure aerosol at the entrance of a muzzle and the mixed high-pressure aerosol is sprayed out from the muzzle; the aerosol is sprayed on the roller in a fanning-shaped way for cooling (as shown). The fanning number and aerosol can be adjusted according to the factual situ