GYRATORY CRUSHER, AND PREDICTIVE FAILURE DIAGNOSER FOR AND PREDICTIVE FAILURE DIAGNOSIS METHOD OF MAKING PREDICTIVE FAILURE DIAGNOSIS ON GYRATORY CRUSHER

A gyratory crusher includes: a mantle fixed to a main shaft; a concave forming a crushing chamber together with the mantle between the concave and the mantle; an eccentric sleeve that supports a lower part of the main shaft via a lower bearing; a driving motor that drives the eccentric sleeve to rotate; and a power transmission that includes a bevel pinion and a bevel gear and that transmits power output from the driving motor to the eccentric sleeve. In the gyratory crusher, meshing vibrational accelerations that occur when the bevel pinion and the bevel gear mesh with each other are obtained; a meshing vibrational acceleration waveform, in which the meshing vibrational accelerations within a no-crushing-load period are chronologized, is determined, the no-crushing-load period being a period in which no to-be-crushed objects are fed into the crushing chamber; and a diagnosis on whether or not there is a sign of a failure is made based on a result of analyzing the meshing vibrational acceleration waveform.