Mixing apparatus having plurality of different blades with multiple functions

Abstract

A mixing apparatus for mixing particulate material is described in which a plurality of different shaped blades are employed for thorough rapid mixing as the material moves downward through a mixing chamber and for impelling the mixed material downward through a discharge opening at the bottom of such chamber. A pair of convoluted lower mixing blades, which spiral downward and inward, are used to mix, to impel the material downward through the discharge opening, and to scrape such material from the conical bottom surface of the mixing chamber. First and second pairs of longitudinal intermediate mixing blades of different lengths positioned above the convoluted blades mix and scrape the material from the cylindrical side surface of the mixing chamber. A plurality of upper deflector blades are attached to the periphery of an upper baffle plate to deflect the material downward after it is thrown outward from the rotating baffle plate when the material is fed onto such baffle plate through the inlet openings of the mixing apparatus. A pair of separate screw conveyor feeding means are employed to transmit two different materials separately into the mixing chamber. For example, a first material consisting of sand and resin binder and a second material consisting of sand and catalyst for cold setting such binder are fed through two inlet openings in the top of the mixing apparatus which discharge the mixed material into boxes for making molds and cores used in metal casting.

Dependencies are inferred from the claim text.