Several Methods Of ZZ Bearing Failure Judgment

Time：2021.04.28  Source：Roller Bearings Suppliers

ZZ bearing fault diagnosis technology 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, etc. Among them, vibration, iron shop and temperature diagnosis technology are used more.

1. Vibration diagnosis technology

When the working surface of ZZ bearing components has fatigue peeling, indentation or local corrosion, periodic pulse signals will appear during the operation of ZZ bearing components. This periodic signal can be received by a sensor (velocity type or acceleration type) installed on the bearing seat, and the fault of ZZ bearings 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: It is especially suitable for fault monitoring of ZZ bearings in rotating machinery.

2. Ferrograph diagnostic technology

ZZ bearing wear particles 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. According to this, judge the working condition of ZZ bearings.

Features: The machine does not need to be disassembled; the investment is low and the effect is good; the early fatigue failure of ZZ bearings can be found; the wear mechanism can be studied.

Application range: It is suitable for fault diagnosis of ZZ bearings lubricated with lubricating oil, and it is difficult for ZZ bearings lubricated with grease.

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3. Diagnosis technology of oil film resistance

A well-lubricated ZZ bearing has a large resistance between the inner and outer rings due to the action of the oil film. Therefore, the abnormality of ZZ bearings can be judged by measuring the resistance of the inner and outer rings of ZZ bearings.

Features: The same evaluation standard can be used for different working conditions. Diagnosis of abnormalities such as surface peeling, indentation, and cracking is poor.

Application range: suitable for occasions where the rotating shaft is exposed.

4. Optical fiber monitoring and diagnosis technology

Optical fiber monitoring is a diagnostic technology that directly extracts signals from the surface of imported FAG bearing rings. 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 face and the surface of the ZZ bearing ring, received by the receiving fiber bundle, and converted into electrical signals by photoelectric elements. Through the analysis and processing of the electrical signals, the operating conditions of the ZZ bearings can be determined. Evaluation.

Features: The optical fiber displacement sensor has high sensitivity; the signal is extracted directly from the surface of the ZZ bearing, which improves the signal-to-noise ratio; it can directly reflect the manufacturing quality, surface wear, load, lubrication and clearance of the rolling bearing.

Application range: Suitable for machines that can install the sensor in the ZZ bearing seat.

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5. Temperature diagnosis technology

If some kind of abnormality occurs in ZZ bearings, the temperature of ZZ bearings will change. Therefore, according to temperature changes, the fault of ZZ bearings can be diagnosed, but the ability to judge abnormalities is very low.

Features: Simple diagnosis; good judgment on burns of ZZ bearings.

Application range: It is suitable for simple routine diagnosis of ZZ bearings in the machine.

6. Acoustic emission diagnostic technology

Metal materials need to release elastic waves due to internal lattice dislocations, grain boundary slippage or 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 conditions of ZZ bearings can be evaluated.

Features: fast and easy diagnosis; online monitoring is possible.

Application scope: The new technologies developed in recent years are rarely used in ZZ bearing condition monitoring.

ZZ Bearing (Shanghai) Co., Ltd (Aka ZZ Bearings) is the complete, one-stop Roller Bearings supplier & manufacturer. All products are qualified and have passed the ISO 9001 qualification. Here are some popular types of Angular Contact Ball Bearings, Send a quote and get the latest price of cheap bearings from ZZ Bearings.