Gottwald Port Technology Gmbh

Andreas Kruschinski

Ronald Kleine

Frank Demelius

The invention relates to a method and a device for safely disconnecting electric drives, wherein disturbances of the electric drive which are independent from the driving and lifting speed are recognized in a delay-free manner by retaining the safety function and are used for disconnecting the electric drive. The signals of the sensors () are detected in a redundant manner and are redundantly compared to preselected threshold values in evaluation devices () such that the electric drive () is safely disconnected in a redundant manner without using mechanical position devices if the preselected threshold value of the electric drive () is exceeded.

Method and device for safely disconnecting electric drives

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.

Growing community of inventors

Düsseldorf, Germany

Andreas Kruschinski