US1205323A - Method of restoring molding-sand. - Google Patents

Description

C. R. CADY. METHOD OF RESTORING MOLDING SAND.

APPLICATION FILED JAN-24,1916.

Patented NOV. 21, 1916.

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CEYLON R. CADY, OF DE TROIT, lMlIlIGHIG-AN.

METHOD OF RESTORING MOLDING-SAND.

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To all whom it may concern:

Be it vknown that I, CnYLoN R. CADY, a citizen of the United States of America, re-

siding at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Methods of Restoring Molding-Sand, of which the following is a specification, reference being had therein to the accompanying drawings.

It is the object of the invention to obtain a treatment for molding sand by which the hot sand from one molding operation is quickly cooled and re-tempered to be available for another operation.

Inhe present state of sand is usually used but once in a day, and the re-tempering process is one requiring considerable time for cooling and distributing the proper amount of moisture. Thus in large plants it is necessary to keep on hand a relatively large quantity of the sand which is not in use. This is objectionable, both on account ofthe cost and particularly by reason of the space required for the storing of the unused sand. With the present invention the sand may be so quickl cooled and re-tempered that it is available or practically continuous use, thereby reducing both the quantity required and the space for its storage.

In the drawings is shown a diagrammatic.

- vertical section through a form of apparatus adapted for the carrying out of my 1mprovedprocess. I

The primary step in my improved process is the abstraction-of the heat from sand which is just removed from the molding flasks. This is accomplished by passing the sand through a cooling apparatus, and preferably by subjecting it to contact witha tit cooling air current. It is, however, essential to guard against the blow away of the dry dust which forms the binder for the particles of sand, and I therefore combine the cooling treatment with a moistening treatment, Furthermore, this moistening a blast of cold air is introduced the hrt Y molding Specification of ltetters Patent. Patentd New, 21] 1916;, Application filed January 24, 1916. Serial No. 73,799. v

C. At the entrance end of this casing is an oscillating screen D, which distributes the sand and permits it to fall in separate streams, and at various'intermediate points in the casing are similar oscillating screens D, D and D Connected to the lower end of the casing is a conduit E, throu h which om any suitable source, the air passing upward through the series of screens and between the falling streams of sand.

F are pipes for the introduction of moisture, preferably water, which is sfirayed by the series of nozzles G G, etc., an is introduced into the several compartments intermediate the screens.

With the apparatus as described, the hot dry sand which is raised by the elevator C is passed through the casing A in opposition to the air current, which, coming into intimate contact withthe separate grains of sand, quickly abstracts the heat. At the same time the water spray will sufliciently moisten the binder adhering to the particles of sand to revent the carrying away of the same by t e air current. Also introducin this-moisture at a series 0 of points avoids on the one hand the washing ofl" of the binder, and on the other hand continuously renews the moisture which is abstracted by evaporation. Thus when the sand reaches the bottom of the casing A it is thoroughly cooled and may if necessary then beintroduced into any suitable mmng and tempering apparatus, such as indicated" at H. Y a

What I claim as my invention.is:

*1. The process of restoring molding sand, comprising the feeding of the hot sand throu h a conduit in one direction, the passtion to the screened sand and the introduction of moisture.

v 3. The process of restorin molding sand comprising the passing '6 the hot sand through a conduit, screenin the sand at a series of points in said con uit to separate the same into fine streams, the passage of a cooling current of air through said condmt in opposition and theintroduction of moisture.

4. The process of restoring molding sa'nd, comprising the droppin of the hot sand through a vertical condult, screening of the sand at a plurality of points in said conduit to separate the same lnto fine streams, the passing of a cooling airscurrent through said conduit in opposition to the sand and the introduction of moisture at a series of points;

5. The process of coolingmolding sand consisting in causing the sand to fall within a confined area and in forcing a current of air upwardly through said area.

6. The process of restoring molding sand consisting in causing the sand to fall within a confined area, forcing a current of air upwardly through said area, and in spraying the falling sand.

' 8. Theprocess of restoring sand consisting in alternately screeningand moisteningthe same within a confined area and in forcing a current of air through said area.-

9. The process of restoring molding sand comprising the feeding of the hot sand through a conduit the passage of an air current longitudinally through said conduit, andthe application ofmoisture to the sand allowing its passage through said conduit.

' In testimony whereof I affix my signature.

CEY'LON R. OADY.

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