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AssigneeAlfelder Maschinen- und Modell-Fabrik Kunkel, Wagner & Co. KG
InventorsRolf Wedek, Lothar Meiritz
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Method and apparatus for the preparation, more particularly for the cooling nd mixing of moulding sand. The method includes the steps of cooling used sand, cleaning the sand where appropriate, and mixing and homogenizing the sand by the addition of water accompanied by intensive agitation, and partly covering the particle surface of the sand with a binding agent under vacuum. The structure for performing the method includes at least one cooling station and one mixing station wherein mixing is associated with a vessel for receiving and with apparatus for supplying constituents to be mixed, and with an agitating device, a device for supplying water, and a device for removing the finished sand mixture, which structure is characterized in that the vessel can be hermetically sealed or is disposed in a hermetically sealed casing and that a vacuum chamber is provided with apparatus for generating a vacuum and at least one flow connection that can be controlled by a controllable valve device is provided between the vessel and vacuum chamber.
Method for the cooling and mixing of moulding sand, in which said method used sand, obtained from a sand batch is cooled and is mixed with other substances by the addition of water and is homogenized accompanied by intensive agitation and the sand particle surface is at least partially covered with a binding agent, characterised in that the sand granule surface is covered with binder under vacuum.
Apparatus for mixing and cooling foundry sand comprising a mixing and cooling vessel, means for charging material to be mixed into the mixing and cooling vessel, a vacuum chamber surrounding the mixing and cooling vessel and in communication therewith, means for hermetically sealing the mixing and cooling vessel, means for drawing a vacuum in the vacuum chamber and in the hermetically sealed mixing and cooling vessel and means within the mixing and cooling vessel for supplying cooling water to foundry sand therein and for mixing the foundry sand therein.
Dependencies are inferred from the claim text.