| 摘要 |
An electromagnetic lifter (1) comprises at least two polar expansions (2, 3) shaped for transporting a horizontal axis coil (4) of hot-rolled steel, the polar expansions (2, 3) being connected through a ferromagnetic circuit (5) and respective cores (6, 7) around which solenoids (8, 9) are arranged, furthermore around each of said cores (6, 7) there is arranged a detection coil (10, 11) suitable to detect the change in the flux linked to the coil (4), and a control unit (16) connected to the detection coils (10, 11) compares the values detected by each of them in order to authorize or not the transport. The relevant operating method includes a first check that the difference between the values detected by the two detection coils (10, 11) is below a preset threshold, and in the affirmative a second check that the overall decrease in the linked flux is below a second preset threshold, the issue of a signal of authorization to the transport being possible only in case of positive outcome of both checks.
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