| 摘要 |
PURPOSE:To set a stopping position of a travel crane with a high degree of accuracy, by comparing a recording value corresponding to a set destination with an actually detected value by a line sensor to stop the crane so that both values coincide with each other or the difference between the both values is within a predetermined range. CONSTITUTION:When a crane 1 arrives at a destination bay, a bay count value 17 and a destination bay No.23 coincide with each other, and therefore a comparator means 24 delivers a coincident signal 29. Further, when the crane 1 arrives at a crane stopping position which is recorded by leaning operation, a support column position code signal 21 from a line sensor 10 coincides with a recorded support column position code 26, and therefore, a coincident signal 28 is delivered. Further, a pair of predetermined position confirmation detectors 13a, 13b are both turned on to deliver a predetermined position signal 19. Accordingly, a logic AND gate 30 which receives these thee signals 19, 28, 29 delivers a stopping instruction 31 to a travel controller 20 to automatically stop the crane 1.
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