Novel cleaning and cooling method for spray gun of hot rolled steel coil jet printing machine

The invention discloses a novel cleaning and cooling method for a spray gun of a hot rolled steel coil jet printing machine, and belongs to the technical field of electrical automation. According to the novel cleaning and cooling method for the spray gun of the hot rolled steel coil jet printing machine, the spray gun and a cooling and cleaning assembly capable of cooling and cleaning the interior of the spray gun are included; and the spray gun is provided with a material return pipe capable of feeding, a feeding pipe, a cooling pipe and a discharging pipe. According to the oil cylinder control system, the front end of the cooling pipe is divided into two paths through the three-way pipe, one path is additionally provided with the one-way air valve, the other path is additionally provided with the cooling water valve, cooling water passes through the cooling water valve to enter the spray gun through the three-way pipe and the cooling pipe in a one-way mode and then is discharged through the spray head, and