| 摘要 |
<p>SPIRAL VANE SHEAR DRUM A spiral vane shearer drum 1 comprises a rotatable outer barrel 2, a plurality of helical vanes 7 welded around the external periphery 6 Or the outer barrel 2 and extending generally radially with respect to the axis of rotation 3 of the outer barrel 2, and a plurality of elongate pick supports 11 welded at spaced apart locations along outer edges 10 of the vanes remote from the outer barrel 2, each pick support providing a male projection 13 adapted, in use, to retain releasably a female apertured pick 16.</p> |
