Here is the answer to how to monitor the vibration of the Sewage pump during operation:
1. Sensor installation and selection
First, the selection of the sensor is the key. For the vibration monitoring of the Sewage pump, the accelerometer is a common choice. It should have a suitable range and sensitivity. According to the scale and operating characteristics of the Sewage pump, the general range of 0-50g (g is the acceleration of gravity) is more appropriate. In terms of sensor installation, it is necessary to select the key parts of the Sewage pump, such as the bearing seat and the pump housing. The vibration at the bearing seat can directly reflect the operating status of the shaft. The accelerometer is firmly installed on the bearing seat. Bolts or special fixtures can be used to ensure that the sensor is in close contact with the bearing seat to accurately obtain the vibration signal. At the same time, sensors can also be installed on the pump housing to monitor the overall structural vibration.
2. Data acquisition system construction
Building an efficient data acquisition system is an important part of vibration monitoring. This system needs to have a high enough sampling frequency to accurately capture the instantaneous changes in the vibration of the Sewage pump. Generally speaking, the sampling frequency should be at least 2-5 times the maximum operating frequency of the Sewage pump. For example, if the maximum operating frequency of the Sewage pump is 100Hz, then the sampling frequency should not be less than 200Hz. The collected data should contain information such as the amplitude, frequency and phase of the vibration. The data acquisition system should also have a real-time storage function to store the collected data in a local database or cloud in chronological order for subsequent analysis and query.
3. Data analysis and processing
The collected data needs to be analyzed and processed in depth. Using signal processing techniques such as fast Fourier transform (FFT), the vibration signal in the time domain is converted into a frequency domain signal. In this way, the main frequency components of the vibration can be clearly identified. By analyzing the vibration amplitude at different frequencies, it can be determined whether the Sewage pump is faulty. For example, if a large amplitude vibration occurs at 1 times the rotation frequency, it may mean that the impeller is unbalanced; if the vibration amplitude is abnormal at 2 times the rotation frequency, it may be that the pump shaft and the motor shaft are misaligned. At the same time, a vibration trend analysis chart can be established to observe the trend of vibration amplitude over time and predict possible faults in advance.
4. Alarm and maintenance decision
According to the analysis results, set reasonable vibration alarm thresholds. The setting of these thresholds should take into account factors such as the model, operating environment, and historical vibration data of the Sewage pump. When the vibration amplitude exceeds the set threshold, the monitoring system should immediately send out an alarm signal to notify the relevant operators. The alarm method can be in various forms such as sound, text message or email. After receiving the alarm, the operator will make corresponding maintenance decisions based on the characteristics and frequency analysis results of the vibration. For example, if the vibration exceeds the standard due to impeller imbalance, maintenance work such as cleaning, repair or replacement of the impeller can be arranged to ensure the normal operation of the Sewage pump.
