Mobile crane
AssigneeSumitomo Heavy Industries Construction Cranes Co., Ltd.
InventorTadatoshi Kamiya
Life of this patent
Estimating the term…
Abstract
There is provided a mobile crane including an undercarriage, turning body turnably supported by the undercarriage, a boom derrickably supported by the turning body, a derricking unit that causes the boom to perform a derricking operation, a derricking force measurement unit that measures a derricking force by which the derricking unit causes the boom to perform the derricking operation, a ground angle acquisition unit that acquires a boom-to-ground angle which is an angle of the boom relative to a ground where the undercarriage is disposed, and an actually suspended load calculation unit that calculates an actually suspended load, based on the derricking force and the boom-to-ground angle.
Claims14
A mobile crane comprising:
- an undercarriage;
- a turning body turnably supported by the undercarriage;
- a boom derrickably supported by the turning body;
- a derrick that causes the boom to perform a derricking operation;
- a derricking force gauge that measures a derricking force by which the derrick causes the boom to perform the derricking operation;
- a derricking angle sensor configured to detect a boom derricking angle A1 which is an angle formed by the boom relative to a first horizontal line perpendicular to gravity direction and extending a forward-rearward direction of the mobile crane;
- an inclination angle sensor configured to detect a turning body inclination angle A2 which is an angle of the turning body relative to the first horizontal line;
- and
- a controller,
- wherein the controller is configured to
- acquire a boom-to-ground angle A which is an angle around an axis about which the boom rotates due to the derricking operation relative to a ground where the undercarriage is disposed and which has a value changing according to an inclination of the ground, based on the boom derricking angle A1 and the turning body inclination angle A2,
- calculate an actually suspended load W, based on the derricking force and the boom-to-ground angle A, and
- restrict an operation of the mobile crane which exceeds a lifting performance, at least based on the calculated actually suspended load W.
Dependencies are inferred from the claim text.