Rolling bearing fault diagnosis technology mainly has vibration
diagnosis technology, iron spectrum diagnosis technology, temperature
diagnosis technology, acoustic diagnosis technology, oil film resistance
diagnosis technology and optical fiber monitoring and diagnosis
technology, which, vibration, iron shop, temperature diagnostic
technology is the most common.
Vibration diagnosis technology
Bearing
parts of the working surface fatigue flaking, indentation or local
corrosion, the bearing will appear in the cycle of the pulse signal. This periodic signal can be installed in the bearing on the sensor
(speed type or acceleration type) to receive, through the analysis of
the vibration signal to diagnose the bearing failure.
Features: vibration diagnostic technology is widely used; can achieve
on-line monitoring; diagnosis is fast, the diagnosis theory is mature.
Applications: Particularly suitable for rotating machinery in the bearing fault monitoring.
2. Iron spectrum diagnosis technology
Bearing wear particles and their working conditions are closely linked. The
lubricating oil with abrasive particles is passed through a strong
magnetic field. Under the action of strong magnetic field, the abrasive
grains are precipitated on the pyrometer film according to certain
regularity. The pyrographic tablets can be qualitatively observed on the
iron microscope or tested on the quantitative instrument , Thus determine the bearing working conditions.
Features: the machine without disintegration; investment is low, the
effect is good; can find the bearing early fatigue failure; do wear
mechanism research.
Application: Suitable for lubrication of lubricating lubricating
bearings, it is more difficult to lubricate bearings with grease.
3. Oil film resistance diagnosis technology
Lubricated good bearings, due to the role of oil film, inside and outside the circle has a great resistance. Therefore, by measuring the bearing, the outer ring of the resistance, the bearing can be made to determine the anomaly.
Features: The same criteria can be used for different operating conditions. On the surface peeling, indentation, cracks and other abnormal diagnostic effect is poor.
Application: suitable for rotating shaft exposed occasions.
4. Optical fiber monitoring and diagnosis technology
Fiber monitoring is a diagnostic technique that directly extracts signals from the bearing collar surface. A displacement sensor made of an optical fiber bundle comprises an optical fiber bundle and a receiving fiber bundle. The light is reflected by the gap between the end face of the sensor
and the surface of the bearing collar, which is received by the
receiving fiber bundle and converted into electrical signal by the
photoelectric element. The bearing condition can be evaluated by
analyzing and processing the electrical signal.
Features: Optical fiber displacement sensor high sensitivity; directly
from the bearing surface to extract the signal to improve the signal to
noise ratio; can directly reflect the rolling bearing manufacturing
quality, surface wear, load, lubrication and clearance.
Applications: Suitable for machines where the sensor can be mounted in a housing.
5. Temperature diagnosis technology
If the bearing produces some kind of abnormality, the bearing temperature will change. Therefore, according to the temperature changes, the bearing failure
can be diagnosed, but the ability to determine the abnormal low.
Features: simple diagnosis; bearing burns to judge better results.
Applications: Simple routine diagnostics for bearings in machines.
6. Acoustic emission diagnostic technology
Metal
materials due to the dislocation of the internal lattice, grain
boundary slip or due to the occurrence and development of internal
cracks, need to release elastic waves, this phenomenon is called
acoustic emission phenomenon. Rolling bearings produce peeling or cracking, will produce different
types of acoustic emission signals, according to the bearing conditions
can be assessed.
Features: fast and easy to diagnose; can be monitored online.
Application: In recent years the development of new technologies, bearing conditions in the application of less monitoring.
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