Management measures for the maintenance and protection system of the induced draft fan

In the state maintenance system we designed, the sensor output signal needs to be filtered and the bandpass filter used. Where Ei is the input terminal, E1 is the high-pass output terminal; E3 is the band-pass output terminal; E2 is the band-pass output terminal, and the band-pass gain (ie, the quality factor) of the bandpass filter is Q, by changing the parameters of the component R or C. To change the center frequency, it does not affect the Q value. The design uses Advantech 16-channel data acquisition card to collect the vibration and temperature signals of the fan in real time. The host computer adopts P586 industrial control computer.

Data Acquisition This software mainly performs functions such as signal processing, dual display of numerical graphs, judgment of alarm limit setting, data compression and storage. The working state of the rotating machine is divided into start-stop and continuous running states. For the sampled data, the maximum and minimum values ​​of each channel data are averaged, and then the peak-to-peak value of all channels is sent to the display buffer for histogram, curve and numerical display. The real-time data is compared with the preset alarm value. If the limit is exceeded, the audio channel and the speaker are used for the audible alarm, and the alarm output is performed by the color change on the display.

Status diagnostics and interface displays provide diagnostic strategies and maintenance consulting services in addition to the type, nature, and location of the fault. In the software compilation, probabilistic statistics, fuzzy mathematics, neural network and other analytical methods are used to analyze the dynamic data including the frequency amplitude, low frequency, first frequency and other frequency doubling spectrum values, one frequency and two frequency phase values. Diagnostic analysis is performed on the rate of change of frequency, first frequency and second frequency amplitude.

A large number of facts have proved that many accidents can be avoided after the state monitoring and fault diagnosis are strengthened for rotating machinery. Now, many old units and old equipment are still in service, and the failure rate is increasing year by year. The replacement of new equipment requires a lot of money and is difficult to achieve. The establishment of an advanced and practical condition monitoring system can effectively extend the service life of equipment and improve the safety and automation of equipment.

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