| 摘要 |
<p>Continuous Molding Sand Mixer Having Reverse Pitched Blades A continuous molding sand mixer comprises an elongated tub having a head end, a tail end, an elongated shaft extending axially within the tub, an entry port at the head end of the tub and a discharge opening at the tail end of the tub. A series of paddles are mounted on the shaft substantially equidistant therefrom and adjacent the tub wall, Power means are provided to rotate the shaft. Most of the paddles are forwardly pitched in one direction to advance sand along the tub from its head end toward its tail end and out said discharge opening when the shaft rotates. Some of said paddles are reversely pitched in the opposite direction and are disposed in the path of sand impelled by the forwardly pitched paddles to restrict sand flow through the tub. This controls sand retention time in the mixer and restricts premature discharge of the sand through the discharge opening.</p> |
