Low noise hollow core slab extruder

B - Operations – Transporting – 28 – B

Patent

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Details

B28B 1/087 (2006.01) B28B 1/08 (2006.01)

Patent

CA 2204978

- 13 - Hollow core concrete slabs are extruded through a packing chamber by a plurality of augers with forming elements at their downstream ends and internal vibrators in the forming elements. A top plate of the packing chamber also carries vibrators. The top plate is vibrated at a rate between 2500 and 4200 vibrations per minute while the internal forming element vibrators operate at a rate between 6500 and 7600 vibrations per minute. The low vibration rates are found to contribute to a good quality concrete slab, while reducing the sound emissions from the apparatus to well below 85 dB. The top plate vibrations are isolated from the rest of the machine by rubber plate mounts.

Des dalles de béton à âme creuse sont extrudées dans une chambre de compactage par une pluralité de trémies avec des éléments de coffrage à leur extrémité aval et des vibrateurs internes dans les éléments de coffrage. Une plaque supérieure de la chambre de compactage porte aussi des vibrateurs. La plaque supérieure vibre à un rythme de 2500 à 4200 vibrations par minute, tandis que les vibrateurs internes des éléments de coffrage fonctionnent à un rythme de 6500 à 7600 vibrations par minute. Les rythmes de vibration peu élevés sont reconnus pour favoriser la production d'une dalle de béton de bonne qualité, tout en réduisant les émissions sonores de l'appareil bien en dessous de 85 dB. Les vibrations de la plaque supérieure sont isolées du reste de la machine au moyen de supports en caoutchouc.

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