| 摘要 |
An apparatus for screening particulate material having a base frame (11), an elevating conveyor (12), and a conveyor carrying frame (13) adjustably mounted on the base frame (11) and arranged to be capable of moving the conveyor (12) generally lengthwise to adjust the position of an upper end (16) of the end (16) of the conveyor. A sub-frame (18) is pivotally adjustably mounted on the base frame (11) via a pivot (20), and it carries a vibratory screen (17) arranged to receive material falling under gravity from the upper discharge end (16) of the conveyor (12). The sub-frame is adjustable about the pivot in order to adjust the attitude of the screen. A tail conveyor (23) is provided for discharging separate screened portions of the material. A linkage (19, 22) exists between the sub-frame (18) and the carrying frame (13) which includes a direct pivotal connection (20) between the sub-frame and the carrying frame whereby there is simultaneous lengthwise adjustment of the sub-frame. The elevating conveyor (12) and the conveyor carrying frame (13) comprise a main portion (12a, 13a) extending from a loading station (14), and an upper end portion (12b, 13b) which includes the discharge end (16) of the conveyor. The main and upper end portions are hingedly connected together to allow the apparatus to be converted between an operative mode in which the end portion forms a prolongation of the main portion, and a transport mode in which the end is pivoted downwardly relative to the main portion to reduce the transport height of the discharge end of the conveyor.
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