Photos of induced draft fan disassembly and inspection
Thread Content
The reason for this disassembly and inspection was mainly the excessive vibration of the bearings and an upward trend in oil temperature; inspections through the observation holes revealed signs that the quality of the oil was deteriorating. 1. Remove the bearing housing. 2. Remove the bearing; it is significantly worn. 3. Clean the bearing housing. 4. Heat the bearing and reinstall it using the hot installation method. 5. The bearing has been reinstalled in place
When removing the bearing housing, it is first necessary to ensure that the equipment is powered off and locked in place to guarantee safety. Next, use appropriate tools to slowly remove the bearing housing, paying attention to the wear condition of the bearing housing and bearings, as well as any possible foreign objects or degraded grease. After disassembly, the components should be cleaned and inspected, and new bearings should be replaced or the damaged parts repaired as necessary. .
The photo I really want the most. Finding the cause is what constitutes maintenance; failing to find the cause means replacing parts.
Yes, there are several reasons for the on-site analysis: 1. The installation quality was not good (the tension at the center and bearing shells), and there were metal shavings in the oil； 2. Perhaps it’s due to the quality of the oil – it is quite dark in color and there is emulsification within the oil ； 3. The operation side is stable, so there should be no major issues.
Looking at this image, it seems to be related to the maintenance of the exhaust fan in a ball mill system or power unit. The working environment around the bearings appears very dirty. Based on the degree of wear of the bearings, noise is likely to be occurring. The oil is quite dark in color; this is probably due to metal shavings resulting from ballistic wear entering the bearing holders and causing prolonged wear, which is why the oil is dark. Judging from the photos on site, it seems that the installation clearance of the bearing is too small, which is caused by excessive pre-tightening.
Or it may be caused by an excessively long operation cycle
Judging from the marks on the inner ring of the bearing, there is a case of uneven loading on the bearing. The bearings at both ends of this fan are one a positioning bearing and the other a floating bearing; it appears from the images that the end in question is the floating one. The reason might be poor floating performance, which results in uneven loading on one side of the bearing. It is important to check the dimensions and geometric tolerances of the bearing housings, and during installation it is necessary to ensure that the values for the top clearance and side clearance are within acceptable limits.
Very professional, thanks for the analysis:handshake