| 摘要 |
PROBLEM TO BE SOLVED: To provide an alarm device for a construction machine capable of informing an operator that a trouble occurs in an alarm means. SOLUTION: In the alarm device for a construction machine provided in a crane-cum-hydraulic shovel provided with a mode switch 40 for selecting an excavation work mode and a load lifting mode, a boom angle sensor 22 for detecting a hanging load W by a hook 21, an arm angle sensor 23, and pressure sensors 24, 25 of a hydraulic cylinder 17 for the boom, the device is further provided with a rotary lamp 43 issuing an alarm to the surrounding people when the load hanging mode is selected by the mode switch 40, an alarm lump 44 and an alarm buzzer 45 which issue an alarm to an operator when the hanging weight W becomes larger than the rated weight Wm, a controller 26 having a function detecting whether the lamp 43, the lamp 44 and the alarm buzzer 45 are normal or not and an abnormality announcing buzzer 46 issuing an alarm when an abnormality of the lamp 44 and the buzzer 45 are detected. . COPYRIGHT: (C)2004,JPO
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