| 摘要 |
PURPOSE:To enable judgment on the presence of a roll flaw and possible abnormality in a detector, by detecting a mechanical vibration of a roll as source of an abnormal sound generated when a roll flaw comes in contact with a rolling material. CONSTITUTION:A mechanical vibration detector 3 mounted on a working roll 1 converts a mechanical vibration of a working roll 2 into an electrical signal with a piezoelectric element. After inputted into a function generator section 10, this signal is used as a amplitude modulation signal to apply an amplitude modulation to a carrier. The signal thus modulated is transmitted to an information processing section by a radio wave. With the information processing section, the received signal is identified and extracted with a band-pass filter 11 and after an amplitude signal is demodulated 13 from the extracted signal, a frequency component corresponding to a roll flaw is extracted with a filter 12 limited to a frequency band width developed when the roll flaw is generated. This signal is full-wave rectified 14 and integrated 15 for a time determined with a timer 16. Thus, the presence of a roll flaw and possible abnormality in the mechanical vibration detector 3 can be judged depending on the magnitude of the output of the integrator 15. |
