Rolling stand roll neck seal
View Patent ↗A rolling mill roll neck is sealed by interposing a seal between a roll flinger having a first axial surface and an opposing second axial surface of a roll housing retaining plate. The seal is biased into contact against one of the axial surfaces with a pressurized fluid source, such as compressed air. As the seal wears during roll neck operation the pressurized fluid maintains biasing contact between the seal and the axial surface. The remainder of the intact seal is remains pressed into contact with the mating, opposing axial surface, for example that of a roll flinger or a retaining plate. Advantageously the seal is housed in a stationary retaining plate that is in opposed axial relationship with a rotating flinger.
1. A seal assembly for a rotatable shaft, said seal assembly comprising:
a seal end plate circumscribing said shaft;
a pair of radially projecting circular flingers mounted on said shaft for rotation therewith, said flingers being arranged to straddle said seal end plate and having interior sealing surfaces spaced axially from respective oppositely facing sides of said seal end plate;
circular grooves in the oppositely facing sides of said seal end plate;
ring seals captured in and projecting axially from said grooves;
a network of first passages in said seal end plate, said first passage being configured and arranged to deliver a pressurized fluid to said circular grooves to thereby bias said ring seals axially into contact with the interior sealing surfaces of said flingers, said ring seals having axially oriented second passages for bleeding said pressurized fluid from within said seal end plate to environmental zones outside of said seal assembly, wherein said second passages comprise axial flutes in external surfaces of said ring seals.
2. The seal assembly of claim 1 wherein said pressurized fluid is compressed air.