| 摘要 |
A separator for pneumatically transported particulate material comprises a separation surface through which, in use, a vacuum is drawn, for separating the particulate material from a gaseous medium in which it is transported and an inlet (30) for feeding a stream of the pneumatically transported io particulate material to the separation surface. The inlet (30) is moveable to sweep the particulate material over the separation surface, which may be a cylindrical sieve drum (2) mounted for rotation about its longitudinal axis. A rotary airlock (18) for pneumatically transported particulate material is comprises a plurality of radial vanes (32) mounted for rotation about a central axis. Each vane (32) is resiliently biased in a first radial position whereby, in use, when a force acts upon it in a direction contrary to the direction of rotation of the airlock (18), the vane (32) is deflected from the first radial position in the direction of the force and when the force is removed the vane (32) returns to the first radial position. |
