Agitating – Mortar mixer type – Methods
Patent
1993-08-16
1994-07-19
Jenkins, Robert W.
Agitating
Mortar mixer type
Methods
366 17, 366 25, 366 40, B28C 704, B01F 1504, B01F 1506
Patent
active
053302656
ABSTRACT:
A process using an improved apparatus for mixing and cooling molding sand. The apparatus including a molding sand mixer that mixes molding sand and further having an adjustable water supply structure; sets of output sensors having a temperature sensor and an electrical conductivity sensor; a sand supply structure; an adjustable blower structure; and a programmable logic control (PLC), programmed to adjust the water supply structure and the blower structure in response to input from one set of output sensors, having a plurality of information inputs and command outputs connected to the adjustable water supply structure and to the adjustable blower structure; some of output sensors being in contact with a flow of molding sand from the sand supply structure and entering into the molding sand mixer and measuring the temperature and moisture content of the molding sand entering into and exiting from the molding sand mixer and being connected to the inputs of the PLC so that the PLC maintains the moisture content of the exiting sand in the range of 1-3.5% and a temperature of less than 120.degree. F. The process requiring a constant and controlled volume of sand is furnished to the sand mixer; the hot sand mixing with the water; the sand and water being mixed with air flowing at a predetermined and controlled rate for a predetermined period of time; a set of output sensors measuring the temperature and moisture content of the sand at a discharge end of the sand mixer; the PLC receiving the temperature and moisture content of the sand at the discharge end of the mixer from the output sensors and automatically effects the changes necessary to maintain the moisture content and temperature of the exiting sand.
REFERENCES:
patent: 2863191 (1958-12-01), Dietert
patent: 2954215 (1960-09-01), Warmkessel
patent: 3161927 (1964-12-01), Dietert
Keating, Jr. James P.
Knopp Leslie C.
Hartley Controls Corporation
Jenkins Robert W.
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