| 摘要 |
<p>A powder transfer apparatus (1) has an expandable connection defined by a tubular, telescopic conduit (2). The conduit (2) is extended by a scissor-jack device (11) controlled by a positioning device (12). Each end of the conduit (2) terminates in a flange (9, 10) having a seal arrangement thereon. Each seal arrangement comprises a circular, inflatable diaphragm (15) and a pair of annular clamping rings (16, 17) which overlie inner and outer edges of the diaphragm (15) respectively. The apparatus (1) is positioned between two containers (21) and the conduct (2) is extended to the most convenient length between the containers (2). The diaphragms (15) are inflated in order to provide an air-tight seal between the apparatus (1) and each container. After the pulverulent material has been transferred, the air in the conduit (2) is evacuated along with any residual powder. The diaphragms (15) are deflated, the conduit (2) retracted and the apparatus (1) is removed from between the containers (2).</p> |
