Commonly used methods for the diagnosis of miniature roller bearing so ( 1)

The most widely used in rotating machinery, rolling bearings is also one of the most easily damaged components in rotating machinery. Rotation are many fault of beauty, with rolling bearings bearing work good ring has a great influence on the mechanical working condition, the trap can cause equipment to produce abnormal vibration and noise, serious when even damage the equipment. To the right condition monitoring and diagnosis of rolling bearing, is a modern enterprise equipment optimization management and an important aspect of predicting maintenance. About the rolling bearing fault diagnosis methods, traditionally the main is according to the amount of state monitoring and diagnosis by using classification, namely the classification according to the nature of the measured signal. According to the classification method, rolling bearing condition monitoring and therefore disabled diagnosis methods can be divided into temperature method, sample analysis and vibration method, etc. Temperature method is through monitoring the housings ( Or box) In judging the temperature of the bearing work is normal. Temperature monitoring of bearing load, speed, and lubrication conditions change reflects a more sensitive, especially for a hot phenomenon caused by poor lubrication of bearing is very sensitive. But, when bearing such as early pitting and spalling, mild wear of a small fault, basically do not reflect the temperature monitoring, only when the fault reaches a certain extent, this method can monitor to the bearing fault. So, temperature monitoring is not applicable to pitting, local peeling so-called local damage type of fault. Sample analysis method is a kind of sample from the oil bearing use, by collecting and analyzing sample to determine the size and shape of metal particles in bearing conditions and the method of fault. This method is only applicable to oil lubricated bearing, and not suitable for grease lubrication bearing. In addition, this method is vulnerable to other bearing damage off under the influence of the particles. So, this kind of method has great limitations. Vibration method is through bearing or box installed in the proper position of vibration sensor to monitor the bearing vibration signal, and the signal analysis and processing to determine the bearing working condition and fault. Due to the vibration method is applicable to various types and various kinds of working condition of bearing; Can be effectively diagnosed early small fault; Signal testing and processing is simple and intuitive; The advantages such as reliable diagnosis results, so is widely used in practice. At present, the development and production of various kinds of rolling bearing monitoring and diagnostic instruments and system often is made according to the principle of vibration method. The literature of bearing monitoring and diagnosis method of vibration are discussed in more than 80%. From the perspective of applicable, practical, effective, in terms of rolling bearing is no better than method of vibration monitoring and diagnosis methods. With the continuous development of science and technology, some new monitoring technology appear constantly and applied to rolling bearing condition monitoring and diagnosis of measurement, such as acoustic emission technology, optical fiber technology, etc. But due to various reasons and limitations, the technology really is applied to the actual rolling bearing diagnosis is still some distance.