Georg Fischer Giessereianlagen Ag

Georg Fischer Disa Ag

Christian Renner

Jovo Laskovic

Ernst O Kruse

Xaver Naf

Used foundry sand is divided into two falling streams and the grains of a first falling stream are accelerated and diverted into the second falling stream.

Process for reclaiming used foundry sand

An apparatus for reclaiming used foundry and molding sand comprises a container having a cylinder sidewall and at least one bottom wall or tray is arranged on a sand reclamation device for the mechanical cleaning of grains of sand, particularly organically and inorganically bonded molding sands. A central, hollow drive shaft is arranged in the cylinder and is supported for rotation. The bottom walls are firmly attached to the hollow shaft. A slot is formed between the bottom walls and cylinder. By the rotation of the bottom walls a parting plane is formed between the rotating part and the stationary part of the column of sand, in which plane an intensive rubbing of grain against grain takes place. As a result of the cylindrical force, the sand is brought in the direction towards the wall of the cylinder and through the slot, which additionally leads to an intensive rubbing of grain against grain. The powder produced upon the rubbing, primarily binder particles which have been rubbed off, is drawn off continuously through the hollow shaft by means of the suction via openings which are provided in the hollow shaft.

Process for the reclamation of used foundry sand

The apparatus includes a stand having a press, a gas permeability measuring device and a weight measuring device mounted thereon for selectively measuring gas permeability, weight, compressor strength, shear strength, bending strength and other mechanical and physical properties.

Apparatus for measuring the properties of mold materials

An apparatus for mixing molding sand which comprises a mixing vessel having a mixing tool disposed within the mixing vessel, the mixing tool comprises an elongated shaft having a plurality of blades arranged along the elongated shaft wherein each of the plurality of blades comprises two opposed identical blade portions fitted to each other by a form fitting connection at a location adjacent the elongated shaft. The form fitting connection includes a groove and a lug on each of the opposed blade portions wherein the lug on one of the opposed blade portions engages the groove on the other opposed blade portion. The groove and lug form in part a peripheral surface of a polygonal recess on the form fitting connection which surface abuts the elongated shaft of the mixing tool when the opposed blade portions are secured to the shaft.

Growing community of inventors

Beringen, Switzerland

Christian Renner