| 摘要 |
PROBLEM TO BE SOLVED: To provide a mechanical unloader operable always keeping the best cargo state. SOLUTION: A scraping device 18 is provided with an insert amount detecting sensor 36 for detecting an insert amount of the scraping device 18, and a driving resistance detecting sensor 40 for detecting a driving resistance of the scraping device 18. A vertical boom 16 is provided with a distance sensor 38 for detecting a distance from a transported object surface to the scraping device 18. A detected value of each sensor is outputted to a computer 44. When the detected value of the insert amount detecting sensor 36 and the detected value of the distance sensor 38 are both in a preset tolerance range, and the detected value of the driving resistance detecting sensor 40 is in a preset tolerance range, the computer 44 operates the unloader keeping the state of a horizontal boom 14.
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