Patent ID: 11952244
Assignee: KOBELCO CONSTRUCTION MACHINERY CO., LTD.
Field: Handling (Mechanical engineering)
Classification: CPC B  G  H | IPC B  G  H

Claim 12:
13. A method for determining a weight state in a crane, the crane including a main body portion which includes a lower travelling body and an upper slewing body turnably provided on the lower travelling body and to which a plurality of weights can be attached; a tag reader which is provided in the main body portion and acquires, from a weight tag mounted on each weight, identification data corresponding to each weight tag by radio communication; and a data processing device which acquires data from the tag reader, the method comprising:
the step of executing processing, by the tag reader, of acquiring the identification data and reception intensity data from each weight tag by the radio communication, the reception intensity data being indicative of a reception intensity of a signal in the radio communication between each weight tag and the tag reader;
the step of acquiring the identification data and the reception intensity data corresponding to each weight tag from the tag reader by the data processing device;
the step of discriminating, by the data processing device, the identification data corresponding to each weight tag into first identification data indicating that a reception intensity indicated by reception intensity data corresponding to the identification data exceeds a reference intensity set in advance for determining whether each weight is attached to the main body portion or not and other second identification data; and
the step of determining an attachment state of each weight to the main body portion based on the first identification data only by the data processing device.