Patent ID: 7395981
Filing Date: 2008-07-08
Classification: B02C

Abstract:
1. A plunger can assembly for a pulverizing mill, comprising: a plunger can body having a fore end, an aft end, and a central axis there between; a stub shaft seated in said aft end of said plunger can body such that a portion of said stub shaft protrudes out of said aft end and bears a load; a locking guide secured in said fore end of said plunger can body, said locking guide having a center bore; a plunger can bushing received through said center bore of said locking guide such that a portion of said plunger can bushing protrudes out of said fore end of said plunger can body; a compression spring contained within said plunger can body and received between said stub shaft and said plunger can bushing, wherein said compression spring applies a force to said stub shaft which translates back and forth in a direction along said central axis in response to said load; an annular flange approximate to said fore end, wherein said annular flange seats against a stiffening ring which encircles an opening in a pulverizer door of the pulverizing mill; a plurality of bores through said annular flange, said stiffening ring, and said pulverizer door that are aligned with each other and spaced circumferentially around said annular flange, said stiffening ring, and said pulverizer door; and a plurality of nuts and bolts through said plurality of bores which secure said annular flange of said plunger can body to said stiffening ring and said pulverizer door.