| 摘要 |
<p>There is disclosed a screening device (10) for separating out relatively large pieces of material from a supply of particulate material, and which comprises a base frame (11), a screen frame (12) mounted on the base frame (11), and a screen (13) mounted on the screen frame (12) and formed of a plurality of cantilever type screening elements or bars (15) which are laterally spaced from each other at predetermined spacings, and with each bar (14) being mounted at one end on the screen frame (12) but being substantially unrestrained throughout its length towards the opposite ends thereof. The screen (13) is capable of receiving a supply of material and operating so as to holdback any relatively large pieces of material while allowing the screened material to fall under gravity through the spaces between the bars (14), and the bars (14) are arranged in groups, with each group being carried by a respective one of a plurality of independently mounted holders (15). Therefore, each holder (15) and its associated group of bars (14) can carry out joint pivotal movement, independently of each of the other holders and associated screening bars, and this facilitates an efficient screening operation, while minimising the risk of unintended oversized material passing through the screen.</p> |
