| 摘要 |
A tumbler (14) is mounted for rotation around a trunnion (30) with a screen (20) fixedly mounted to a portion of the trunnion (30) residing within the tumbler (14). A multiple blade paddle (24) is mounted to a shaft (26) that is rotatably supported through the trunnion (30). The paddle (24) blades are formed with angular edges. As the tumbler (14) rotates and the paddle (24) rotates, powder (P) is repeatedly dropped onto the screen (20) to be sifted with the aid of the paddle (24). Rotating the tumbler (14) further drops unsifted portions of the powder (P) out of the screen (20) to mix with additional powder (P) in the tumbler (14) body. Thus, sifting and blending of powders is accomplished in one single operation. |
