The implementation of condition monitoring on field devices has become an indispensable means for enterprise equipment management, which can grasp the basic operating state of equipment and realize predictive maintenance, laying a good foundation for long-term, full-load and low-cost production of production process equipment. Strong technical support for precise management and precise repair. However, the information picked up by the state monitoring must be accurate. If the collected information is not accurate, the subsequent fault diagnosis conclusions will not be correct, thus losing the meaning of monitoring.
For example, in a horizontal centrifugal pump with different shape shells, two different test probes (magnetic probes and probe probes) are used to monitor at the same measuring point. The surface of the measuring point is not flat, and there is a problem of large deviation of the picked vibration speed data. The occurrence of this phenomenon, the difference of the probe is not the main reason, mainly because the surface of the monitoring point is a very narrow step and casting concave and convex. When monitoring, you need a hand-held sensor to move the probe to find the ideal measuring point, and then touch the conversion meter with the other hand. It is very inconvenient to use the function and observation data and map display. In response to this problem, the centrifugal pump casing is ground at the center of the outdoor surface of the rolling bearing, that is, the vertical radial and horizontal radial local (x, y-axis) surfaces are rounded to a diameter of about 20 mm (close to the size of the magnetic probe of the monitoring instrument). The shape of the plane makes the planar circular shape magnetic sensor firmly adsorbed on the plane of the device, and the extracted data information has high credibility and convenient operation.
The problem exposed by the vibration monitoring of the pump unit is that the motor fan guard is not in close contact with the casing, and the information picked up on the motor fan guard is definitely not accurate. Therefore, the position of the measuring point should be opened to ensure that the monitoring instrument test probe directly contacts the bearing chamber measuring point. If the screw of the fixed motor fan guard is in the ideal monitoring position, it can be selected as the monitoring point. If the screw is a semi-circular head screw cap, the semi-circular head should be made flat, which not only ensures the accuracy of the pick-up information, but also facilitates the monitoring process. A large number of rotating equipments of the enterprise are installed and dispersed. The test probes used are basically magnetic sensor probes. At this time, it is also possible to purchase instruments (magnetic probes and probe probes) in which the monitoring probes are interchangeable, but the instruments are frequently disassembled. Changing the probe will cause the connector to be damaged too quickly and the operation is troublesome. Therefore, it is considered that the uneven surface of the large-scale casing monitoring point should be ground into a planar shape.