Big-Diameter and High-Loaded Bearing's Fault Characteristics and Diagnosis of Softcalender's Bottom Roll of Paper Machine
App Zhenjiang · 2005
In this paper,mainly studied were dynamic developing process and characteristics,with many spectrums shown,of the bearing fault of the Softcalender's Bottom Roll(SBR,Φ1 575×13 115 mm,(9 800 kg),291 r/min,working loading 250 kN/m) of a modern high-speed paper machine(MHPM,designed-speed 1 700 m/min,operating speed 1 500 m/min),and the diagnosis-researching methods and the characteristic vibration frequencies(CVF) about SBR bearing fault were discussed.The followings were indicated: it was a long and developing process,usually taking more than 5 months,for SBR bearing to be damaged from the faulted to the died;among spectrums,the most important are finding,identifying and tracking SBR bearing fault CVF which could be known with three ways(calculated by theoretical formulae,or with the fault-frequency index,or by experiential formulae,all listed in the paper);the bearing fault oscillation existing in both axial(more sensitive and larger) and diametric directions,because of high weight of SBR,was always not so large,even when it died,as not to reach the controlled fault-vibration-standard of common rotating machine,a particular fault characteristic different from others,but there was an apparent trend of increasing fault oscillation;the spectrum pattern of the SBR bearing fault were with apparent multiple frequencies of non-rotating-frequency,with increasing rotating-frequency side bands and wide frequency-spectrum background energy when the bearing deteriorated.