Method for pressure compensation in hydraulic motors in crane operations
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United States of America Patent
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-
Sep 16, 2003
Grant Date -
N/A
app pub date -
Nov 13, 2000
filing date -
Nov 11, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for pressure compensation in reversible motors used to drive hoisting cables and closing cables of a cable operated crane is provided. The method includes connecting a hydraulic motor to hoisting cables, connecting another hydraulic motor to closing cables, connecting the hydraulic motors to a common pressure medium source via delivery lines, performing a closing operation of a grab of the crane while simultaneously detecting working pressures in working circuits of the hydraulic motors, adjusting the working pressures during the closing operation using a control so that during the grab the working pressures are substantially equal to one another. The present invention also provides a device for pressure compensation in reversible motors for driving hoisting cables and closing cables of a cable operated crane.
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