DISPERSION MIXING AND AIR FLOW TYPE CLASSIFYING DEVICE

PROBLEM TO BE SOLVED: To reduce the size of a device and to simplify its operation by providing the inside of a raw material supplying pipe with a mixing area for mixing the upper flow and lower flow consisting of the air flow in the raw material supplying pipe and plural powder raw materials flowing together with the air flow and dispersing the powder raw materials in the air flow. SOLUTION: The classifying area is segmented to, for example, three sections by classifying edges 17, 18 disposed at a side wall 23 and a lower wall 25. The lower part of the side wall 22 is provided with the raw material supplying pipe 116 consisting of a supplying nozzle part 32 having an aperture opened to the classifying chamber and a tubular part 33. The raw material supplying pipe 116 consists of a pyramidal cylindrical part 32 which is the supplying nozzle part narrowed in the aperture to the classifying machine and a deformed cylindrical part 33 which is a uniform tubular part. This deformed cylindrical part 33 is formed as a curved pipe to mix and disperse the introduced powder in the mixing area where the direction of the pipe wall changes. As a result, the dispersed particle groups are introduced at a uniform dust concn. to the classifying area of the classifying machine 1.