Apparatus for detecting a failure in bearings.

摘要

An apparatus for detecting a failure in a bearing has an acoustic emission sensor (1) which detects acoustic emission from the bearing and outputs signals indicative of power of the acoustic emission, a bandpass filter (3) which passes only signals in the range from 100 kHz to 500 kHz out of the signals received from the aforementioned sensor (1), and a comparator (6) which compares each of the signals in the range from 100 kHz to 500 kHz extracted by the bandpass filter (3) with a predetermined threshold value and outputs event signals each of which expresses that the signal from the bandpass filter (3) exceeds the threshold value. This apparatus also has a computer [7) which receives the event signals from the comparatpr (6), calculates periods at which the event signals occur, totalizes the number of event signals for respective periods, and judges whether or not the number of events totalized exceeds a predetermined threshold value to judge a failure in the bearing.