Patent ID: 8448888

Claim:
A trunnion seal assembly for joining a stationary inlet/outlet box of a ball tube mill to a rotational interior of the ball tube mill, the trunnion seal assembly comprising: a) an outer ring component configured to be mounted to an outer wall of a stationary inlet/outlet box of a ball tube mill, the outer ring component having an outer filler body defined along a chord of a circle defined by the inner circumference of the outer ring component; b) an inner ring component including an inner filler body defined along a chord of a circle defined by the inner circumference of the inner ring component, the inner ring component being joined to the outer ring component substantially concentrically with the inner and outer filler bodies defining a filler having a substantially triangular cross-sectional profile wherein the outer ring component includes an axially outward base of the triangular profile, and wherein the inner ring component includes an axially inward apex of the triangular profile; c) a flexible pad seal configured to be joined to the outer wall of the stationary inlet/outlet box proximate the outer ring component, the pad seal including a first annular sealing surface; and d) a mill head extension ring configured to be joined to a rotational mill head proximate to and substantially concentric with the inner ring component, the mill head extension including a second annular sealing surface sealingly engaged with the first annular sealing surface of the pad seal, the first and second annular sealing surfaces forming a seal to discourage passage of particles within the mill passing into the surrounding air.