The invention relates to devices for loading installations for treating raw materials containing carbon, such as gas generators and ovens, inter alia, and for using in installations for processing household and industrial waste. The device consists of a loading chamber and two downwardly expanding sealable chambers arranged in a row beneath each other, and separated from each other and from the chamber of the installation by closing elements. The central chamber of the device comprises the inlet and outlet cross-sections of the gas flue with forced gas circulation, in the circuit of which flaps and the gas cooler are installed. As a technical result, the operating reliability of the device is increased by preventing the adhesion of thermoplastic raw materials to the working bodies by maintaining the temperature in the central chamber below the melting point of the raw material constituents.