Device for cooling the opening of a rotary kiln by means of cool airblowing, said kiln comprising a metal cylinder lined internally with a refractory material, said cylinder being rotatably mounted relative to the frame of the kiln, into which materials are intended to be inserted and fired, said device for cooling comprising: - said cylinder of said rotary kiln and an end part of the metal cylinder, covered with a refractory material, secured to said cylinder, intended to protect the end of the cylinder of the kiln from high temperatures, - two concentric metal casings (5, 6), known as the inner casing and outer casing, said two casings (5, 6) surrounding said cylinder of the kiln and constituting two annular channels (50, 60) between on the one hand, said cylinder and said inner casing, known as the first channel, and on the other hand, between said inner casing and said outer casing, known as the second channel, - ventilation means that allow cool air to flow through said annular channels (50, 60), in such a way as to allow the flow of air in said first channel to the end part, then the flow of air in the opposite direction in said second channel, before the escaping of the air via an exhaust opening of said second channel, characterised in that it comprises: - an annular distribution chamber, surrounding said cylinder and secured to said cylinder of the kiln, supplying said fist channel with air, - said ventilation means comprising at least one fan and an electric motor actuating said at least one fan, said ventilation means being borne on the metal cylinder of the kiln, rotatably mounted therewith, supplying said distribution chamber in an airtight manner, - rotating electrical connectors (10, 11), comprising annular rings surrounding said cylinder of the kiln, and contacts, able to slide or roll on the annular rings during the rotation of the kiln in order to allow electricity to be supplied to the electric motor(s) of said ventilation means. - said cylinder of said rotary kiln and an end part of the metal cylinder, covered with a refractory material, secured to said cylinder, intended to protect the end of the cylinder of the kiln from high temperatures, - two concentric metal casings (5, 6), known as the inner casing and outer casing, said two casings (5, 6) surrounding said cylinder of the kiln and constituting two annular channels (50, 60) between on the one hand, said cylinder and said inner casing, known as the first channel, and on the other hand, between said inner casing and said outer casing, known as the second channel, - ventilation means that allow cool air to flow through said annular channels (50, 60), - an annular distribution chamber, surrounding said cylinder and secured to said cylinder of the kiln, supplying said fist channel with air, - said ventilation means comprising at least one fan and an electric motor actuating said at least one fan, said ventilation means being borne on the metal cylinder of the kiln, rotatably mounted therewith, supplying said distribution chamber in an airtight manner, - rotating electrical connectors (10, 11), comprising annular rings surrounding said cylinder of the kiln, and contacts, able to slide or roll on the annular rings during the rotation of the kiln in order to allow electricity to be supplied to the electric motor(s) of said ventilation means.