Installation piece for supporting a roller in a roller stand

An installation piece for supporting a roll in a roll housing of a rolling stand comprising:

• a main bore for holding a roll neck;
• an inlet for lubricant;
• an outlet for the lubricant;
• a pump device for conveying the lubricant flowing back out of the installation piece through the outlet;
• wherein the pump device comprises a housing, an inlet channel, and an outlet channel, wherein, with respect to the flow of the lubricant, the inlet channel communicates with the inlet and the outlet channel communicates with the outlet;
• and
• wherein the pump device is driven by the flow of the lubricant in the inlet;
• wherein the pump device comprises a housing, arranged in the housing are:
• a screw pump with a feed screw in the outlet channel for conveying the returning lubricant;
• and
• a turbine in the inlet channel for driving the screw pump, the turbine being driven by the lubricant being supplied under pressure;
• the screw pump has a tubular base body with an outer surface that carries the feed screw;
• the housing comprises a bore, in which the screw pump is rotatably supported in bearings;
• wherein a space between the outer surface of the base body and an inside surface of the bore forms the outlet channel;
• wherein the feed screw projects into the outlet channel to convey the lubricant;
• and
• wherein the housing has retaining members arranged to axially position the bearings and thus also the screw pump in the interior of the bore so that the bearings and the screw pump are free to rotate;
• wherein the feed screw has turns arranged at an acute angle α, in a flow direction of the lubricant in the return, to the tubular base body;
• the retaining members are configured as spoked wheels or perforated plates, each of which extends in a plane perpendicular to a longitudinal axis of the bore in the housing;
• each of the retaining members having a periphery connected to the housing at the inside surface of the bore;
• and each of the retaining members having an inside end, coaxial to the bore, that carries one of the bearings for the screw pump;
• and
• an interior of the tubular base body forms the inlet channel, in which the turbine, nonrotatably connected to the base body, is arranged.