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US 4,307,591 AGranted
Rolling mill looper control system
AssigneeWestinghouse Electric Corp.
InventorRobert S. Peterson
Life of this patent
Estimating the term…
Abstract
In a hot strip rolling mill a velocity damping compensator circuit is added to the current regulating loop of the looper motor drive generating a torque on the looper arm mechanism between roll stands, thereby to prevent disturbances when applying the looper arm and looper roller against the strip being rolled.
Claims2
In a rolling mill looper control system for controlling a looper arm supporting a looper roller adapted to engage a strip of material to be rolled from a first roll stand to a second roll stand, including a direct-current looper motor for applying torque to said looper arm;
- a speed regulator for adjusting the speed of at least one of said first and second roll stands to provide a predetermined extra-length of said strip between said first and second roll stands;
- and control circuit means associated with said direct current motor and responsive to a signal representative of instantaneous looper arm position for establishing a torque as a function of looper arm position, while applying said looper roller against said strip;
- the combination of:
- means responsive to said instantaneous looper arm position representative signal for deriving a correction signal representative of looper arm position rate of change;
- with said control circuit means being responsive to said correction signal, thereby to compensate for short term variations in said looper arm positioning.
2 more elements
Dependencies are inferred from the claim text.