| 摘要 |
A sifting apparatus for particulate and/or granular materials comprises means such as a feed hopper (1) for feeding a powder material to be sifted to a sifting screen (3). Rotatable paddle means (4) is provided within the sifting screen for agitating the powder and air is supplied to the sifting screen by means such as an auger (9) rotating within a tube (11), so as to fluidise the powder within the screen (3) and to carry the powder through the screen. Sifted powder is removed from the apparatus by the fluidising air while material that is unable to pass through the screen (3) is removed from the apparatus by the means for supplying the air, for example by reversing the direction of rotation of the auger (9). |
