Fan run laps rolling bearing fault case for some plants

Fan mill rolling bearing 2020 - run laps fault cases 05 - 19 equipment general situation of fan mill for cantilever structure, driven by motor through coupling, structure as shown in figure 1. The motor rated speed 2900 r/min, 48. 33赫兹) 。 In figure 1, 2 for motor drive and drive end point, 3, 4 for the fan side drive side and the drive end bearing measure point, fan bearings on both ends are for 6310. The motor power 15 kw, air volume 100 m & sup3; /min。 Fan structure diagram in figure 1 failure site description in the middle of August, 2017, the station fan abnormal vibration, the performance of wind turbine, the cantilever support two bearing abnormal cyclical vibration impact noise. Table 1 for the vibration measurement, the no. 3, 4 point vibration levels, main show is horizontal and axial vibration is big. With the fan running at full speed, drive on the drive side two level of bearing and axial direction vibration is more than standard ( ISO10816 - 3 category 2 rigid foundation) A lot, especially for drive end bearing axial direction vibration at 11. 55mm/s。 1) vibration analysis process Data figure 2: the drive end bearing vibration impact obviously figure 3: the drive end bearing demodulation spectrum figure 4: the drive end bearing acceleration spectrum figure 5:1) the speed of the drive end bearing spectrum Data analysis of the measured spectrum: according to the figure 2 the drive end bearing horizontal acceleration waveform can be found that the obvious vibration impact measuring point. According to figure 3, the site of the demodulation spectrum can be found in the spectrum exist obvious bearing outer ring failure frequency and its harmonic frequency, the analysis of bearing lubrication is insufficient or outer ring early wear and tear. According to the figure 4, the site of the acceleration spectrum can be found that the spectrum in 151. 6Hz（ Bearing outer ring fault frequency) Many times harmonic frequency, and the analysis of the bearing outer ring fault has developed to the middle. According to the figure 5 the measuring point velocity spectrum, spectrum also exist in 151. More than 6 hz and its harmonic frequency, and the analysis of the bearing's outer ring has wear and tear to the later period, and before the measuring point vibration level exceed international standards, the proposal should stop immediately, to replace the bearing. Below is change the bearing outer ring, can obviously found the bearing outer ring has severe depressions. Figure 6: the damage of outer ring conclusion this case demonstrates that the application of vibration monitoring and fault diagnosis technology, for rolling bearing fault diagnosis provides an efficient and reliable means of modern technology. Through monitoring and analysis of the abnormal vibration, the vibration analysis of the relevant theory and actual unifies, to the theory instruction practice, again by practical test and rich theory, to accurately determine the root cause of abnormal vibration fan, and on this basis to guide the scientific maintenance, overhaul direction at the fault parts, to avoid the blind repair, in order to ensure the safety operation has laid a stable fan, effective technical support. （ Source: HengTong technology services)