| 摘要 |
<p>Method, arrangement, and feed screw for feeding and compacting a concrete mass in an extrusion casting machine, which arrangement comprises at least one feed screw (5) for feeding the concrete mass and elements (8, 9) for rotating the screw (5), in such a way that its helix pushes the mass parallel to the central axis of the screw. Further, in the arrangement, there are elements (11, 12, 13) for moving the feed screw (5) forwards and backwards inside the mass. The feed screw (5) is shaped in such a way that the surface (16) of the side of the helical blade (15) of the feed screw (6), which is on the trailing side of the helix, is at least over part of the height (h) of the helix tilted in the direction of the trailing side, in such a way that a straight line (19) drawn from the intersection (17) of the helical blade (15) on the trailing side of the helical blade and the casing (14) of the screw to the point ( 18) of the helical blade, in the same cross-section, forms, over at least part of the length of the helix, an acute angle (a) with the central axis (K) of the screw in this cross-section.</p> |
