System for determining the load mass of a load carried by a hoist cable of a crane
AssigneeLiebherr-Werk Nenzing GmbH
InventorsKlaus Schneider, Martin Amann, Mathias Schneller, Oliver Sawodny, Sebastian Kuechler
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Abstract
The present disclosure relates to a system for determining the load mass of a load carried by a hoist cable of a crane, said system comprising a measurement arrangement for measuring the cable load in the hoist cable and a calculation unit for determining the load mass on the basis of the cable force, wherein the calculation unit has a compensation unit which describes and at least partly compensates the effect of the indirect determining of the load mass via the cable force in a model.
Claims16
A crane control system for indirectly determining a load mass of a load carried by a hoist cable of a crane, comprising:
- a measurement arrangement for measuring a cable force in the hoist cable to produce a signal indicating the cable force;
- and
- a calculation unit including non-transitory code stored in a non-transitory computer-readable storage medium for receiving the signal indicating the cable force and indirectly determining the load mass based on the indicated cable force, wherein the calculation unit has a compensation unit, which calculates an influence of the indirect determination of the load mass via the cable force in a physical model in the calculation unit and at least partly compensates this influence in calculating the load mass,
- wherein the compensation unit includes a cable mass compensation which compensates for a weight of the hoist cable during the calculation of the load mass and which compensates for a change of cable length when the load is raised and/or lowered, wherein the hoisting gear includes a winch and a winch signal indicating an angle of rotation and/or a speed of rotation of the winch is received by the compensation unit and is an input parameter in the cable mass compensation.
Dependencies are inferred from the claim text.