B - Operations – Transporting – 28 – B
Patent
B - Operations, Transporting
28
B
25/24
B28B 3/22 (2006.01) B28B 1/08 (2006.01)
Patent
CA 1205985
ABSTRACT OF THE DISCLOSURE The invention provides an improved extrusion moulding machine of the type used to produce greatly elongated hollow-core, tension-reinforced slabs of hydraulic concrete or other settable material. Typically such a machine extrudes a "zero-slump" concrete mix from a mould formed between the machine and a mould floor over which it is moved by reaction of the extruded material against the already-extruded moulded portion of the slab. Screw thread conveyors are used to move the concrete mix from a hopper on the machine into the mould, and in the apparatus of the invention are provided with replaceable trailing land segments to permit replacement when worn, eliminating the need for expensive complete replacement of the conveyor screws and consequent lengthy down-time. Vibrators are provided within the mould cores that produce the hollow cores and above the mould to permit the stiff concrete mix to flow smoothly over the mould surfaces, and the vibrators' motors are provided with individual direction reversing capability, since it is found that individual adjustment of direction can give optimum operation. A preferred core cross-section is provided consisting of a "flat-topped" octagon.
419185
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