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US 10,850,953 B2Granted
Lifting device, in particular a mobile crane or a cable-operated excavator, having an apparatus for monitoring the raising and lowering procedures of a boom system and corresponding method
AssigneeLiebherr-Werk Nenzing GmbH
InventorsWalter Mietschnig, Manfred Schapler, Thomas Klimmer, Mathias Eder, Martin Stenech
Life of this patent
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Abstract
The invention relates to a lifting device, in particular a mobile crane or a cable-operated excavator, having an apparatus for monitoring the raising and lowering procedures of a boom system of the lifting device.
Claims12
A lifting device (1), having an apparatus for monitoring raising and lowering procedures of a boom system of the lifting device (1), the apparatus comprising
- a device for detecting loads increasing an overturning moment of the lifting device (1);
- a device for detecting loads stabilizing or reducing the overturning moment of the lifting device (1);
- a control unit configured to calculate a limit holding force (FGrenz) for a holding line of the boom system of the lifting device (1) from the detected loads;
- and
- a device for detecting actual holding force of the holding line,
- wherein the control unit is configured to compare the limit holding force (FGrenz) and the actual holding force.
3 more elements
A method of monitoring the raising and lowering procedures of a boom system of a lifting device (1), comprising the steps of:
- detecting loads increasing overturning moment of the lifting device (1);
- detecting the loads stabilizing or reducing the overturning moment of the lifting device (1);
- calculating a limit holding force (FGrenz) for a holding line of a main boom (2) of the lifting device (1) from the detected loads, by a control unit;
- detecting actual holding force of the holding line;
- and
- comparing the limit holding force (FGrenz) and the actual holding force by the control unit.
3 more elements
Dependencies are inferred from the claim text.