US 4,096,587 AGranted

Mixer for resin and sand

AssigneeEscher Wyss Limited

InventorWalter Haller

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Abstract

Mixer for resin and sand comprises walls which form an inlet for the sand, an annular gap for the sand following the inlet, following which gap is an axially symmetrical mixing chamber and an outlet for the mixture; a supply arrangement with pipes for the separate components of the resin is provided in the mixing chamber, and a rotatable dished member is arranged beneath the pipes; two solids of revolution arranged coaxially one above the other are provided between the mixing chamber and the outlet, between which solids an annular intermediate interstice is left for the mixture, the lower of the solids of revolution limiting the mixing chamber in the downward axial direction and being rotatable; the dished member of the supply arrangement and arranged below the pipes for the components is connected to the lower, rotatable solid of revolution; that surface of the dished member facing the mixing chamber is made at least partially to rise radially outwards, and, spaced from the rising surface of the dished member, an annular disc which is coaxial therewith and which has a central opening is fixed to the dished member so that an interstice which is open in an outward radial direction is formed between the annular disc and the dished member; at least one component of the resin is guided through the central opening of the annular disc directly to the rising surface of the dished member.

Claims10

Dependent claims

In a foundry mixing machine for preparing a mixture of sand and a resin having at least two components and which comprises wall means defining a sand inlet chamber, a preliminary mixing chamber located below the inlet chamber, and an annular slot positioned vertically between said chambers and serving to allow sand to descend by gravity from the inlet chamber to the preliminary mixing chamber;

and an annular final mixing chamber having an inlet at its inner margin which communicates with the preliminary mixing chamber and an outlet at its outer margin, the final mixing chamber being defined by a gap between two axially spaced bodies of revolution, each of which bodies carries projections which extend toward the gap and the lower one of which rotates, the improvement which comprises feeding means for delivering the resin components, in non-atomized states, to sand in the preliminary mixing chamber and which includes
a. a dished member connected to rotate with, and located centrally of, the rotatable body of revolution and having an upper surface provided with at least a portion which rises in the radially outward direction;
b. an annular disc coaxial with the dished member and spaced axially therefrom to define an interstice which, at its outer periphery, opens into the preliminary mixing chamber,
c. the annular disc having a central opening and being connected to rotate with the dished member and the rotatable body of revolution;
and
d. supply means for at least one of the resin components which is arranged to deliver said component through the central opening of the annular disc and onto said rising portion of the upper surface of the dished member,
e. the dished member serving to coarsely disperse said one resin component and project it radially through said interstice and into sand in the preliminary mixing chamber.

4 more elements

Dependencies are inferred from the claim text.