How to diagnose the fault of the pillow block 20mm?

Fault diagnosis of pillow block 20mm, bearing fault reflected by abnormal sound
(1) The bearing emits a uniform and continuous "sizzling" sound. This sound is generated by the rotation of the rolling elements in the inner and outer diagrams, and contains irregular metal vibrations that are not related to the speed. Generally, it shows that the amount of grease in the bearing is insufficient and should be supplemented. If the equipment is down for too long, especially in the low temperature conditions in winter, the sound of "sizzling" may sometimes be emitted during the operation of the bearing, which is related to the reduction of the radial clearance of the bearing and the reduction of the penetration of the grease. The bearing clearance should be adjusted appropriately, and new grease with a higher penetration degree should be replaced.

(2) The pillow block 20mm bearing emits a uniform and periodic sound in the continuous "swoosh" sound. This sound is caused by the scars, grooves and rust spots on the rolling elements and the raceways of the inner and outer rings. The period of the sound is proportional to the speed of the bearing. The bearing should be replaced.
(3) The discontinuous "stemming" sound from the pillow block 20mm is caused by the rupture of the cage or the inner and outer rings. The bearings must be stopped immediately to replace the bearings.

(4) Irregular and uneven "chattering" sound from the bearing is caused by impurities such as iron filings and sand particles falling into the pillow block 20mm. The sound intensity is small and has no relation to the number of revolutions. The bearing should be cleaned, regreasing or oil change.
(5) The sound of continuous and irregular "sanding" from the bearing is generally related to the loose fit between the inner ring and the shaft of the bearing or the loose fit between the outer ring and the bearing hole. When the sound intensity is high, the matching relationship of the bearing should be checked, and the problem should be repaired in time.

(6) The pillow block 20mm makes continuous piercing whistling sound. This sound is caused by poor lubrication of the bearing or lack of oil, causing friction, or partial contact of the rolling elements is too tight, such as the deviation of the inner and outer ring raceways, the inner and outer rings of the bearing are too tightly matched, etc. And caused. The bearing should be inspected in time to find out the problem and deal with it symptomatically.

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