Liner for a casting shake-out and reclaimer

Abstract

A tumbling unit such as a casting shake-out unit, rotary media drum, sand reclaimer or the like includes a cylindrical outer shell and a cylindrical inner liner. The inner liner is formed of a series of interfitting segments. The segments each have an inner surface, an outer surface, side edges, a front edge, a back edge, and two vanes extending from the outer surface. The side edges of the segments have a groove and the grooves of neighboring segments define a channel between the segments. A pin in the channel urges the neighboring segments apart to form a tight interfit among the segments in a row of the liner. The pin conforms in shape and size to the cross section of the vanes, and aligns with the vanes of the adjacent segments to form a continuous spiral upon the outside of the liner.

1 . A tumbling unit, such as a casting shake-out unit, rotary media drum, or a sand reclaimer, the tumbling unit comprising:
 a cylindrical outer shell;   a cylindrical liner positioned within said outer shell, said liner being formed of a series of interfitting segments arranged in rows;   each of said segments having a generally smooth inner surface, an outer surface opposite said inner surface, mutually parallel side edges, a front edge, a back edge, and two parallel vanes extending from said outer surface, and arranged angularly with respect to the longitudinal axis of the tumbling unit, said pair of vanes spacing said segment from said outer shell to prevent rocking of the segments and to prevent premature wear of the liner due to rocking of said segments, each of said segments being arcuate for approximately 35° to 45° of arc, said side edges having a groove formed therein and extending the length of said side edges, the grooves of neighboring segments defining a channel there between, said front edge, said back edge, and said side edges defining corners at their mutual intersections;   each of said segments having a plurality of perforations through said inner surface and said outer surface, each of said perforations having an elongated shape perpendicular to the length of said tumbling unit and arranged in seven rows for the purpose of allowing materials being treated by the tumbling unit to pass there through;   each of said segments including tongues on said front face and said back edge, and cut-outs in the four corners of said segments, said tongues being longer than said cut-outs, each of said cut-outs including a cover raised from said outer surface, said tongues and said cut-outs being shaped and positioned to enable said segments to interfit with each other;   one of said vanes extending from the center of one of said side edges to beyond said tongue upon said front edge and the other of said vanes extending from beyond said tongue upon said back edge to the center of the other of said side edges;   said vanes of one segment aligning and abutting with said vanes of another segment into a continuous spiral;   each of said vanes having a constant angular relation to said outer surface, thus avoiding any choke points to prevent accumulation of any sand, media, or debris thereat; and   an elongated retaining pin received in said channel to urge adjacent segments apart, thus forming a tight interfit among the segments in each row of said liner.   
     
     
         2 . A tumbling unit such as a casting shake-out, rotary media drum, or a sand reclaimer, said tumbling unit comprising:
 a cylindrical outer shell;   a cylindrical liner positioned within said outer shell, said liner being formed of a series of interfitting segments;   each of said segments having an inner surface, an outer surface, mutually parallel side edges, a front edge, a back edge, and two parallel vanes extending from said outer surface, said parallel vanes angularly arranged with respect to the longitudinal axis of the tumbling unit, and said pair of vanes spacing said segment from said outer shell in order to prevent rocking of a liner due to uneven wear of the vanes, and thereby preventing premature wear of said tumbling unit due to rocking of the interfitting segments;   the side edges of the segments having a groove formed therein and extending the length of said side edges, the grooves of neighboring segments defining a channel therebetween;   each of said segments having a plurality of perforations through said inner surface and said outer surface, said perforations having an elongated shape with rounded ends perpendicular to the length of said tumbling unit and being arranged in seven rows; and   an elongated retaining pin received in said channel to urge adjacent segments apart, thus forming a tight interfit among the segments in a row of said liner.   
     
     
         3 . The tumbling unit of  claim 2 , wherein the elongated retaining pin has a cross-sectional shape corresponding to the cross-section of each vane, whereby when two interfitting segments are aligned longitudinally with a retaining pin intermediate thereof, it prevents the accumulation of material at the meeting of the two vanes and eliminates a choke point from impeding the flow of sand, media, or other debris through the drum.