A paper pulping machine drive bearing fault vibration analysis

A paper pulping machine of 2019 - drive bearing fault vibration analysis 03 - 26 ( Xi 'an science and technology for al) 1 equipment overview pulping machine is composed of motor, gear box and mill ( FIG. 1) , its function is to the pulp fiber cutting and wire brush. Pulping machine unit power is bigger, the meshing clearance between the two grinding directly affect the quality of pulp and paper. In this case, the mechanical and electrical machine grinder speed is 1420 RPM, power 1200 kw, pulping machine rated speed is 467 RPM. Pulping machine of the drive end bearing model for SKF FAG / 23044 CC/W33, pulping machine drive end bearing model for SKF FAG / 6040. Figure 1 2 fault analysis based on the structure of the pulping machine for al INL3301 wireless smart sensor monitoring data, the pulping machine in down one month before the drive end horizontal velocity RMS vibration amplitude increase gradually, FIG. 2) RMS, faster than 1. 69 mm/s。 Pulping machine speed not drive on the time domain waveform figure is to turn 2 x frequency interval shock ( Figure 3) , RMS maximum speed is more than 4. 22 mm/s。 According to the standard ISO10816 ( Group3_rigid) Speed RMS ( mm/s） Greater than 2. 8 for high, greater than 4. 1 is high. So you can determine, equipment malfunctioned. Figure 2 pulping machine horizontal velocity RMS trend tutu 3 not drive on the pulping machine speed not drive on the time domain waveform figure determined the equipment malfunction, we on monitoring data of the drive bearing mill for further analysis. Data show that pulping machine horizontal velocity spectrum is not drive on 106. 88HZ（ 14. 25 x) And the frequency doubling ( Figure 4) , there are 7. 5 hz side band ( Frequency) （ FIG. 5) , with the drive end bearing SKF FAG 23044 CC/W33 frequency close to the inner ring fault. Figure 6 pulping machine level not drive on the envelope is on the rise trend diagram, a gradual increase in vibration amplitude. Figure 7 spectral envelope of pulping machine not drive on 106. 88 hz and the frequency doubling. Analysis conclusion is pulping machine the drive end bearing inner ring, level is high. To advise the users check, pay close attention to the vibration change trend, if there are any downtime, check the pulping machine drive end bearing. Figure 4 pulping machine speed spectrum tutu 5 pulping machine not drive on the drive speed spectrum zoom tutu level 6 pulping machine not drive on the envelope trend tutu and pulping machine the spectral envelope of driving end to dismantling the unit 3 fault verification site, found that the pulping machine more than the knife dish side bearing inner ring show the phenomenon of pitting and spalling corrosion sag ( Figure 8) At run time, so the equipment have not normal impact, to verify the diagnostic analysis conclusion before we correct. Figure 8 pulping machine cutter side bearing inner ring repair, after the completion of the paper mill to replace the device of the drive bearing, set back after completion of loading, pulping machine speed waveform figure not drive on the overall vibration amplitude is small ( Figure 9) Return to normal levels, pulping machine vibration amplitude ( Figure 10. ) 。 Figure 9 pulping machine speed waveform figure (not drive on the After repair) Figure 10 contrast before and after pulping machine maintenance