Patent ID: 7735653
Filing Date: 2010-06-15
Classification: B02C,B22C,Y10S

Abstract:
1. An attrition mill for reclaiming foundry sand from deposited material having lumps of used foundry sand and included material, the attrition mill comprising: a housing defining a chamber for receiving the lumps of used foundry sand and included material, the chamber having an opening through the top of the housing; and a base disposed within the housing and having an elevated end defining a reject outlet adjacent a gateless reject end of the mill and a lower end, the lower end being downstream from the opening; the base including an extension section upstream from the opening and defining the gateless reject end; a discharge wall positioned adjacent the base lower end defining a sand outlet adjacent a sand end of the mill; a resilient support attached to the housing; and a vibratory drive attached to the housing and including first and second eccentrically loaded motors; a controller operably coupled to the first and second motors, the controller selectively operating the first and second motors in a normal mode, in which the first and second motors are rotated to generate a vibratory force in a first direction that advances the deposited material generally toward the sand outlet and the gateless reject end is unrestricted, and a reject mode, in which at least one of the first and second motors is operated to generate a vibratory force generally in a second direction that advances the deposited material generally toward the reject outlet and the gateless reject end is unrestricted; the extension section creating an overall base length that sufficiently spaces the base lower end and the gateless base reject end to retain the deposited material within the chamber during operation of the vibratory drive.