| 摘要 |
The invention concerns a method for detecting contamination and/or damage in a face (11, 12') running through a nip (N) or nips in a paper machine or in a paper finishing machine, such as a calender or a coating device. In the method, vibrations formed in connection with constructions of the machine are detected and processed. The vibrations are detected by means of at least two detectors (20, 21, 25). Based on the point of time of detecting of the vibrations detected by means of the detectors (20, 21, 25), the location of the damage and/or contamination (M; M1, M2) on the face (11, 12') to be monitored is determined. In the method, it is possible to detect vibrations in the frame of the roll (10, 12, 15) that forms a nip and/or in the bearings (14a, 14b) of the roll by means of a pair of detectors (20a, 20b, 21a, 21b; 22n). The location of the source of disturbance in the axial direction (X) of the roll is determined on the basis of a difference in phase () between the vibrations arriving in different detectors in a pair of detectors. By means of detectors (20a, 20b) placed in connection with the bearings (14a, 14b) of the rolls to be monitored, it is additionally possible to monitor the condition of the bearings of the rolls.
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