Patent ID: 6824088
Filing Date: 2004-11-30
Classification: B02C

Abstract:
A roller mill, comprising:a base; a pulverizing table having a substantially horizontal upper surface, supported against said base and arranged to be rotated around a vertical axis intersecting the upper surface in a center point thereof; an annular groove, formed on the upper surface of said pulverizing table, adjacent to an outer periphery of said table; at least one roller shaft mounted pivotably on said base in proximity to said table, at an angle &agr; with respect to horizontal direction, toward the center point and having an end portion located above said table; a pulverizing roller supported rotatably against the end portion of said at least one roller shaft; and means for pressing said pulverizing roller toward said annular groove, wherein raw material introduced to said rotatable pulverizing table is pulverized by compression between said annular groove and said at least one pulverizing roller, wherein said pulverizing roller is manufactured such that, when said pulverizing roller initially is installed in the roller mill, and prior to said pulverizing roller being used to pulverize the raw material, said pulverizing roller has an outer peripheral pulverizing surface, which includes a substantially flat section located in the central portion thereof and at least one arcuate section continuous with the flat section.