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US 5,704,561 AGranted
Wear-resistant hard-surfacing for the rolls of high-pressure roll presses for size reduction of granular material
AssigneeDeutz Aktiengesellschaft
InventorsJakob Ansen, Frank Fischer-Helwig, Ludger Alsmann, Michael Wollner
Life of this patent
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Abstract
The rolls of high-pressure roll presses for the compressive size reduction of granular material are hard surfaced with nub pins which are wear-resistant and suitable for autogenous wear protection. The nub pins, which have a long potential service life even under the action of high compressive loads, have a radially inner pin part (13) which is easily welded to the roll surface (12) and a radially outer harder pin part (14) protectively covering the radially inner pin part.
Claims13
A high-pressure roll press for the size reduction of granular material comprising:
- a pair of counter-rotatable rolls each having a roll surface (12) and a plurality of outwardly projecting cylindrical nub pins welded onto said roll surface (12) at predetermined intervals from one another to form pockets (17) for the accommodation of compacted fine granular material, each of said nub pins including
- a radially inner cylindrical pin part (13) of easily weldable material, said radially inner part (13) being welded to said roll surface (12) and
- a radially outer cylindrical pin part (14) protectively covering said inner pin part (13), said radially outer pin part (14) being materially bonded to said radially inner pin part (13) and consisting of a material substantially harder than said easily weldable material of said radially inner pin part (14),
- said nub pins extending radially from said roll surface (12) to a height greater than approximately 5 mm and said predetermined intervals being smaller than approximately 40 mm.
1 more element
Dependencies are inferred from the claim text.