Particulate drum mixer with scoop section and seal assembly with bladder

A drum mixer for mixing particulate product, the drum mixer comprising:

• a drum having a peripheral wall defining a main mixing chamber, the drum being rotatable about a generally horizontal rotation axis, the drum having an open end;
• a scoop section comprising:
• a peripheral wall defining a scoop chamber and fixed relative to the peripheral wall of the drum, the scoop chamber being open to the main mixing chamber on one side and providing a center opening on an opposite side;
• plurality of scoop blades, each of the scoop blades attached to the peripheral wall of the scoop section and extending inward to a drop radius;
• a hoop attached as part of the scoop section and fixed relative to the plurality of scoop blades, the hoop having an axially extending seal surface;
• a stationary hood face covering the center opening of the scoop chamber, the stationary hood face having a discharge opening disposed within the drop radius to receive particulate product dropped from the plurality of scoop blades;
• a seal member biased radially against the seal surface of the hoop for inhibiting fine particles of particulate product from passing between the rotatable drum and the stationary hood face, the seal member maintained stationary relative to the stationary hood face;
• wherein the plurality of scoop blades are radially enclosed by the peripheral wall of the scoop section.