General vibration signal measuring system of fan

Abstract

The invention discloses a general vibration signal measuring system of a fan, wherein the system realizes the variable frequency multi-channel synchronous sampling function for automatically tracking revolving speed based on phase signals. Site phase signals can be effectively identified and regulated by adopting two-way peak detection superimposing technique for phase signals, thereby improving the adaptability of field application of products. A general signal access circuit is designed to be a compatible circuit which is capable of enabling a plurality of vibration sensor signals of circuits to be compatible, realizing the synchronous, fast and high-precise sampling of signals, and being suitable for the state monitoring system design of large rotation machineries in various industrialsites. The A / D (analogue / digital) sampling frequency can be adjusted automatically according to the revolving speed by a CPLD (complex programmable logic device) logic control circuit; the single-board multi-channel synchronous sampling is realized, and multi-board card multi-channel synchronous sampling is also realized. The measuring system has the characteristics of strong generality, reliableperformance, high precision, simple configuration and the like.

Description

technical field [0001] The invention belongs to the technical field of electrical measurement, in particular to the vibration signal measurement technology of industrial equipment, in particular to a general vibration signal measurement system for fans, which realizes the frequency-variable multi-channel synchronous vibration signal measurement function of automatic tracking speed based on the key phase signal. Background technique [0002] The speed of wind turbines is constantly changing. As the wind becomes stronger or weaker, the fan may start and stop frequently, and the amplitude and frequency spectrum of its vibration will also change greatly. If the speed is not tracked in real time, it is likely to cause errors in vibration measurement values ​​and cause false alarms. At present, most of the existing vibration detection technologies are aimed at the analysis of constant speed, which is difficult to meet the vibration monitoring requirements of fans. [0003] There...

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Problems solved by technology

[0004] The invention provides a general vibration signal measurement system for fans, which realizes the frequency-variable multi-channel synchronous vibration signal measurement function of automatically tracking the speed based on the key phase signal, and mainly solves the sampling technology when the speed of the fan changes, the measurement technology compatible with different sensors, and multiple boards. Multi-channel simultaneous sampling technical issues

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