Practical skills for fault diagnosis of the hottes

Practical skills of rolling bearing fault diagnosis

rolling bearings are widely used in equipment. The state of rolling bearings is directly related to the running state of rotating equipment, especially in continuous large-scale production enterprises, which are widely used in important parts of large-scale rotating equipment. Therefore, doing a good job of rolling bearing condition monitoring and fault diagnosis in actual production is an important link in doing a good job in equipment maintenance and management. After long-term practice and exploration, we have accumulated some practical skills for the actual fault diagnosis of rolling bearings. 1、 Methods and key points of rolling bearing fault diagnosis the practical method of condition monitoring and fault diagnosis for rolling bearings is vibration analysis. In practice, we should pay attention to the location of measuring points and the acquisition method. In order to truly and accurately reflect the vibration state of the rolling bearing, it must be noted and then tightened. Therefore, the signal collected by cutting the screw on the screw is accurate and true. Therefore, the measuring point should be arranged at the place closest to the bearing. Generally, there is a rear fan cover at the free end of the motor, and the selection of the measuring point at the fixing screw of the fan cover has a better monitoring effect. In addition, attention must be paid to the multiple acquisition and analysis of vibration signals for comprehensive comparison. To get an accurate conclusion. 2、 Characteristics and practical diagnostic skills of normal operation of rolling bearings we have found in the long-term production condition monitoring that rolling bearings show strong regularity and good repeatability in their use. When normal high-quality bearings are used at the beginning, the vibration and noise are relatively small, but the spectrum is somewhat scattered and the amplitude is small. See Figure 1. It may be caused by some defects in the manufacturing process, such as surface burrs. Figure 1 after the vibration waveform or spectrum of a motor rolling bearing moves for a period of time, the vibration and noise maintain a certain level, and the spectrum is very single, with only one or two times the frequency. The frequency spectrum above three times of power frequency rarely appears, as shown in Figure 2. The bearing is in a very stable state and enters a stable working period. Figure 2 after the vibration waveform or spectrum of a motor rolling bearing continues to operate and enters the late stage of use, the bearing vibration and noise begin to increase, and sometimes there are differences. What data do we need? Generally speaking, the vibration increases slowly. At this time, the kurtosis value of the bearing suddenly reaches a certain value. See Figure 3. We believe that at this time, the bearing shows initial failure. Each year, the direct and indirect economic losses caused by friction and wear are about 1% to 2% of the annual GDP. Fig. 3 vibration waveform and frequency spectrum of rolling bearing of a motor