Roundness measurement system

Abstract

The present invention provides a roundness measurement system, including a round frame, including a vertically extending rotating shaft, a connecting arm extending horizontally and fixed to a point aof the rotating shaft, a measuring arm vertically extending and fixed to a point b of the connecting arm; a sensing device, fixed to a point c of the measuring arm, where the sensing direction is parallel to the connecting arm, to detect a distance M between a sensing end and a surface of the measured circular component in a sensing direction; an inclination angle sensing device is configured to sense an inclination angle theta of the connecting arm relative to a horizontal plane in actual measurement, a data acquisition and conditioning device, communicating with the distance sensing device and the inclination angle sensing device to collect and condition a detection signal to form detection data; a data processing device, receiving the detection data, according to a distance L1 between the point a and the point b, a distance L2 between the point b and the point c, and a distance L3 between the sensing end and the point c, M, and theta, calculating a radial distance N between the sensing end and the surface of the measured circular part when the connecting arm is in a horizontal state at each angle, and calculating a roundness value of the measured circular part according to N byusing a preset procedure.

Description

technical field [0001] The invention relates to the technical field of roundness measurement, in particular to a roundness measurement system. Background technique [0002] There are many large circular parts in hydropower equipment that need to be rounded, such as the seat ring of the water turbine, the leak-proof ring of the top cover and the bottom ring, the generator stator, the upper and lower frames of the generator, the generator stator, the rotor, and the Francis turbine. The upper and lower anti-leakage rings of the runner, the journals of the guide bearings of the unit, the flange of the main shaft, etc. [0003] A general roundness measurement system usually includes a circular frame and a sensor for distance measurement. The circular measuring frame includes a rotating shaft arranged vertically and positioned coaxially with the measured circular part, a connecting arm extending horizontally and having one end fixed to the top of the rotating shaft, and a measuri...

AI Technical Summary

Problems solved by technology

[0004] However, due to the large size of the circular part, the connecting arm is usually long. Due to factors such as deflection and deformation, it is difficult to maintain a horizontal posture, which makes it difficult to maintain the vertical posture of the measuring arm. In the end, the sensing direction of the sensor may not be in the direction of the circular part. In the radial direction, the measured spacing is not the radial spacing

Therefore, in order to ensure the accuracy of the data, it is necessary to calibrate the angle of the round frame before measuring each measuring point, and the operation is very complicated.

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