| 摘要 |
PURPOSE:To early detect damage of every bearing by detecting a supersonic signal generated by damage of a bearing and discriminating same from noise according to a characteristic of the signal. CONSTITUTION:Back-up rolls 3a, 3b disposed outside work rolls 2a, 2b are supported by bearings 4a, 4b, 5a, 5b, and an acoustic sensor 10 is provided on the bearing 4b. An acoustic signal received by the acoustic sensor 10 is input to a filter 12 through an amplifier 11. Subsequently, the signal processed by an envelope detection circuit 13 is input to a continuous signal discrimination circuit 14 and a sudden signal discrimination circuit 15. The signal processed by the respective discrimination circuits is input to a bearing abnormality discrimination circuit 16. The bearing abnormality is discriminated by the bearing abnormality discrimination circuit 16 and the result is displayed.
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