Raw material mixing apparatus

A raw material mixing apparatus, comprising two horizontally-arranged cylindrical mixing drums and a feed pipe for feeding raw materials to each said mixing drum, wherein each of the two mixing drums is provided with a feed port and a discharge port, the feed ports of the two mixing drums are both communicated with the feed pipe, and a switching valve is arranged on the feed pipe;

• a first rotating disc and a second rotating disc are rotatably connected at two ends of each said mixing drum respectively, and a stirring assembly is connected between the first rotating disc and the second rotating disc in the axial direction of each said mixing drum;
• the stirring assembly comprises a central stirring element and a plurality of non-central stirring elements radially arranged between inner side walls of each said mixing drum and outer side walls of the central stirring element, the outer side walls of the non-central stirring elements are all arranged closely adjacent to the inner side walls of each said mixing drum, each of the non-central stirring elements has a spreading bar arranged inside, and the central stirring element and the non-central stirring element are both movable in the axial direction of the first rotating disc and the second rotating disc, and the axial movements of the central stirring element and the non-central stirring element are in opposite directions.