Selection of Measuring Points in the Use of Bearing Vibration Measuring Instrument

Vibration is not only a quality evaluation standard, but also the quality grade of bearings can be divided according to it; vibration is also a quality control method in the bearing manufacturing process. Through the analysis of bearing vibration, problems in the manufacturing process can be found.Bearing Vibration DetectorIt has the characteristics of abnormal sound analysis and online management of bearing quality. It is suitable for bearing vibration detection of bearing manufacturers and online analysis of single bearings.

check process.

The impact vibration of the rolling bearing caused by the fault bow propagates outward in the form of hemispherical surface waves from the impact point, and is transmitted to the box or frame through the bearing components and bearing seats. Due to the high frequency of the impact vibration, it is transmitted through the component interface each time , the energy loss is about 80 percent. Therefore, the measurement point of the bearing vibration detector should be as close as possible to the bearing area of ​​the bearing under test, and the intermediate transmission link should be reduced as much as possible. The closer the detection point is to the outer ring of the bearing, the more direct. The sensor The position has a certain influence on the fault detection sensitivity. If the sensor is 100 percent when placed in the bearing direction, then at ±45 degrees in the bearing direction, the sensor will drop to 95 percent (-5dB), and in the axial direction to 22 percent -25 Percentage (-1213b). When the thrust bearing fails to generate shock and radiates spherical waves outward, if the reading at the bearing cap facing the fault is 100 percent, the reading on the axial direction of the bearing housing will be reduced to 5 percent (-19dB). .

Since the vibration of rolling bearings reflects different characteristics in different directions, vibration detection in the horizontal (x), vertical (y) and axial (z) directions should be considered as much as possible. However, due to the structure and installation of the bearing vibration detector Due to the limitation of conditions or due to economic considerations, it is impossible to detect in every direction. At this time, two directions can be selected for detection.