Patent ID: 7240800
Filing Date: 2007-07-10
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; a base disposed within the housing and having an elevated end defining a reject outlet adjacent a reject end of the mill and a lower 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; 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 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 a lift frame attached to the resilient support for raising the sand end of the mill, the lift frame comprising an airbag.