Press roller

A roller for a roller press for briquetting, compacting, or grinding granular material, the roller comprising:

• a core extending along an axis and formed with
• axially opposite outer ends,
• an axially central passage, and
• axially spaced and radially extending inlet and outlet passages extending radially at the outer ends from the central passage and opening radially outward at an outer surface of the core;
• a coolable jacket attached to and surrounding the core and formed with
• two axially oppositely directed end faces past which the axial opposite outer ends of the core extend axially, and
• a plurality of axially extending cooling passages that extend axially between the end faces, that open axially outward at the end faces, and that extend in the jacket radially inward of an outer surface of the jacket and radially outward of an inner surface of the jacket;
• and
• respective manifold rings mounted on the outer ends of the core, covering the inlet and outlet passages at the end faces of the jacket, and each formed with
• an annular and radially inwardly open groove that extends angularly and into which a respective one of the inlet and outlet passages opens and
• respective L-shaped connecting passages each having an axially extending segment opening into a respective one of the cooling passages of the jacket and a radially extending segment opening into the respective groove, such that coolant can flow from the inlet passage to the groove of one of the manifold rings, then radially and axially through the passages of the one manifold ring to the cooling passages at the respective end face of the jacket, then axially through the cooling passage to the other end face of the jacket, then axially and radially to the groove of the other manifold ring, and thence out the outlet passage without separate piping or corrugated steel tubes.