| 摘要 |
PROBLEM TO BE SOLVED: To stack coils in an annealing furnace with a spacer interposed therebetween and with their axes in the vertical direction using a crane having a lifting magnet, to carry the coils to a place for coils, and correctly store and update the address of the position of each coil in a memory for the place for coils. SOLUTION: A coil or a spacer to be hoisted in an annealing furnace is selected by a crane operator using a selecting means 26, a first exciting current Ic is given in a lifting magnet 1 when the coil is hoisted, a second exciting current Is smaller than the first exciting current is given to the lifting magnet when the spacer is hoisted, and only the spacer is hoisted. The exciting current given by the lifting magnet is detected by an exciting current detecting means 29, and only when the first exciting current Ic is detected, the address in a memory M2 for a place for coils can be updated.
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