SKF bearings fault diagnostic technology vibration diagnosis technology, diagnosis technology of ferrographic diagnosis techniques, temperature, oil film resistance diagnosis technology, acoustic diagnosis technique and optical fiber monitoring and diagnosis technology, which, vibration, temperature diagnosis of iron shops, more.
1, vibration diagnosis
Working surface of the bearing components when there is a localized corrosion fatigue spalling, creasing or, NSK bearings run periodic pulse signal occurs. Such a periodic signal can be mounted on the bearing sensor (speed or acceleration) to receive, through the vibration signal analysis to bearing fault diagnosis.
Features: vibration diagnostic technique widely; can realize on-line monitoring diagnosis, diagnosis theory has matured.
Application: particularly suitable for bearing fault monitoring of rotating machinery.
2, ferrographic diagnosis technology
FAG bearings wear particles and their working conditions are closely linked. With wear particles of lubricating oil by a strong magnetic field, in high magnetic field under the action of the abrasive according to certain laws that precipitated iron on the spectrum of iron spectrum in ferrographic microscope observation on qualitative or quantitative test on instruments, according to judge the work of bearing condition.
Features: collapse of the machine without investment low, the effect is good; can find early fatigue failure of bearings; wear mechanism.
Application: applied to fault diagnosis of bearings are lubricated by lubricating oil, grease lubricated bearings more difficult.
3, oil film resistance diagnosis technology
INA bearings lubrication good, due to the role of oil, between the inner and outer rings have a lot of resistance. By measuring the resistance of the bearing inner and outer rings, bearing the exception can be judged.
Features: uses the same word for different conditions of evaluation standards. Indentation, cracks and other surface spalling, differential diagnosis of abnormal results.
Application: applied to the axis of the exposed locations.
4, fiber monitoring and diagnosis technology
Optical fiber monitoring is a diagnostic technique of direct extraction from the bearing ring surface signal. Made with optical fiber bundle displacement sensors contain transmitting optical fiber bundle and receiving optical fiber bundles. Light emission fiber bundles through the sensor end clearance with the bearing ring surface reflected back, received by the receive fiber bundles, optoelectronic components converted to electrical signals, through the analysis of signal processing, to assess the bearing conditions.
Features: fiber optic displacement sensor with high sensitivity directly extract signals from the bearing surfaces, increasing the signal-to-noise ratio; could directly reflect the degree of manufacturing quality, surface wear of rolling bearings, load, lubrication and clearance.
Applications: suitable for sensors can be installed in housings of machines.
5, temperature diagnosis technique
Bearings have some exceptions, the bearing temperature changes. Therefore, according to temperature changes, bearing fault diagnosis can be, but an exception to the judge's capacity is very low.
Feature: diagnosing simple; bearing burns to judge better.
Application scope: applies to simple routine diagnostic machine bearings.
6, acoustic emission diagnosis technology
Metal grain boundary sliding due to internal lattice dislocations, or because of an internal crack occurrence and development, requires the release of elastic waves, a phenomenon known as acoustic emission phenomena. Flake or crack of rolling bearing, can produce different types of acoustic emission signals by which to assess the bearing condition.
Features: diagnostic fast, easy online monitoring.
Range of application: development of new technology in recent years, less bearing condition monitoring application.



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