Method for measuring rotor bow with transverse currents sensing method

Abstract

The invention relates to an eddy transducer rotor curve contactless measuring method mainly used for the measurement and curves drawing of a rotor of large rotary machinery. Signals collected by an eddy transducer are input into a computer through an acquisition card and processed on virtual instrument LabVIEW software platform. Curve characteristics and the curves of the rotor are output. Compared with the existing measuring method, the advantages of the measuring method are embodied in the operational convenience. The system adopts the eddy transducer instead of dial indicators in existing system as data-collecting front-end in order to overcome the disadvantages of operational complexity of existing measuring method. Both the fixation and the reading of dial indicators used for being arranged in gaps between the rotor blades are not convenient. By adopting the eddy transducer, the only thing necessary is to adjust and fix the gap voltage, and the eddy transducers is non-contact measurement, only the gap between the front-end of the eddy transducer and rotor surface needs to be adjusted, which is convenient for operation.

Description

technical field [0001] The invention is mainly used for the measurement and bending curve drawing of large rotating machine rotors, especially for the measurement and bending curve drawing of steam turbine rotors of generator sets. Background technique [0002] Measuring principle: measure the maximum bending amount of each point in the length direction of the rotor, and draw a bending curve with the length of the rotor as the abscissa and the maximum bending amount of each point as the ordinate. [0003] Wobble - The radial runout of the outer edge of a rotating part relative to the axis. [0004] Bending—the deviation between the line connecting the maximum radial runout points on each section of the shaft and the original axis. [0005] The maximum bend value is one-half the value of the maximum shake. [0006] The current measurement method: the rotor bending measurement mostly adopts the mechanical diameter measurement in the contact measurement method. The measureme...

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Problems solved by technology

[0007] This measurement method is complicated to operate; manual reading is required, which is prone to errors; bending curves need to be drawn manually; the most important thing is that it takes a long time and the efficiency is low

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