Time：2020.08.17 Source：Roller Bearings Suppliers
The fault diagnosis technology of tapered roller bearings mainly includes vibration diagnosis technology, ferrograph diagnosis technology, temperature diagnosis technology, acoustic diagnosis technology, oil film resistance diagnosis technology and optical fiber monitoring and diagnosis technology. Among them, vibration, iron shop and temperature diagnosis technology are the most applied universal.
1. Vibration diagnosis technology
When the working surface of the tapered roller bearing component has fatigue peeling, indentation or local corrosion, periodic pulse signals will appear during the operation of the bearing. This periodic signal can be received by a sensor (velocity type or acceleration type) installed on the bearing housing, and the fault of the bearing can be diagnosed through the analysis of the vibration signal.
Features: Vibration diagnosis technology is widely used; online monitoring can be realized; diagnosis is fast, and the diagnosis theory is mature.
Application range: Especially suitable for fault monitoring of bearings in rotating machinery. WSBC 22210 CCK/W33 roller bearings online , pls click here :
2. Ferrograph diagnostic technology
The wear particles of tapered roller bearings are closely related to their working conditions. Pass the lubricating oil with abrasive particles through a strong magnetic field. Under the action of the strong magnetic field, the abrasive particles are deposited on the ferrograph according to a certain rule. The ferrograph can be qualitatively observed on a ferrograph microscope or tested on a quantitative instrument , Judging the working conditions of tapered roller bearings based on this.
Features: The machine does not need to be disassembled; the investment is low and the effect is good; the early fatigue failure of tapered roller bearings can be found; the wear mechanism can be studied.
Application: Suitable for fault diagnosis of tapered roller bearings lubricated with lubricating oil, but difficult for tapered roller bearings lubricated with grease.
3. Oil film resistance diagnosis technology
A well-lubricated tapered roller bearing has a large resistance between the inner and outer rings due to the oil film. Therefore, the abnormality of tapered roller bearings can be judged by measuring the resistance of the inner and outer rings of the bearing.
Features: The same criteria can be used for different working conditions. Diagnosing abnormalities such as surface peeling, indentation, and cracking is poor.
Application: Suitable for occasions where the rotating shaft is exposed.
4. Optical fiber monitoring and diagnosis technology
Optical fiber monitoring is a diagnostic technique that extracts signals directly from the surface of the bearing ring. The displacement sensor made of optical fiber bundles includes a transmitting fiber bundle and a receiving fiber bundle. The light is reflected by the transmitting fiber bundle through the gap between the sensor end surface and the bearing ring surface, received by the receiving fiber bundle, and converted into electrical signals by photoelectric elements. Through the analysis and processing of the electrical signals, the working conditions of tapered roller bearings can be evaluated .
Features: The optical fiber displacement sensor has high sensitivity; it extracts signals directly from the bearing surface to improve the signal-to-noise ratio; it can directly reflect the manufacturing quality, surface wear, load, lubrication and clearance of tapered roller bearings.
Application: Suitable for machines where the sensor can be installed in the bearing housing. WSBC 22214 CC/W33 roller bearings online , pls click here :
5. Temperature diagnosis technology
If a tapered roller bearing has some kind of abnormality, the temperature of the bearing will change. Therefore, according to temperature changes, the tapered roller bearing fault can be diagnosed, but the ability to judge abnormalities is very low.
Features: Simple diagnosis; good judgment on burns of tapered roller bearings.
Application: Suitable for simple routine diagnosis of bearings in machines.
6. Acoustic emission diagnostic technology
Metal materials need to release elastic waves due to internal lattice dislocation, grain boundary slippage, or due to the occurrence and development of internal cracks. This phenomenon is called acoustic emission. When the rolling bearing is peeled or cracked, different types of acoustic emission signals will be generated. Based on this, the working condition of the tapered roller bearing can be evaluated.
Features: fast and easy diagnosis; online monitoring.
Application scope: The new technology developed in recent years is rarely used in the monitoring of tapered roller bearing conditions.