US 7,395,981 B2Granted

Plunger can assembly

AssigneeRobert L. Parham and Patricia L. Parham, Trustees, or Their Successors In Trust, Under the Parham Family Trust Dated August 29, 2000, and Any Amendments or Restatements Thereof

InventorRobert L. Parham

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Abstract

A plunger can for a roller assembly within a pulverizing mill has a body which contains a compression spring. A stub shaft transfers the force generated by the compression spring to the roller assembly. A bushing in cooperation with a locking guide in the fore end of the plunger can, along with the stub shaft in an aft end of the plunger can, contains the compression spring there between. The locking guide has an annular flange that fits within an annular channel within the plunger can body. A plurality of extensions spaced around an outside perimeter of the annular flange cooperates with a plurality of extensions around an inside perimeter of the plunger can body such that both sets of extensions clear each other when the locking guide is inserted into the plunger can body. When rotated, the sets of extensions are aligned with each, forming a mechanical lock.

Claims23

Dependent claims

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.

6 more elements

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 at said fore end having an annular channel formed interior to said annular flange, and having a plurality of inward extensions on a top side of said annular flange that are spaced equidistantly around an inside perimeter of said annular flange.

3 more elements

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;
wherein said plunger can body is bolted to the pulverizing mill through a pulverizer door, and further wherein said stub shaft can be removed from said plunger can body without having to unbolt said plunger can body from said pulverizer door.

3 more elements

Dependencies are inferred from the claim text.