Study On Straightness Of Elevator Rails Measurement Method And Experimentation

As a major shape error of elevator rails, straightness error affects the quality of elevator's installation and run directly. How to measure straightness error of elevator rails with a high accuracy and a high speed has been a metrology problem, which has not been fixed properly until now. Thus in this paper measurement theory and system of straightness of elevator rails are studied. A new straightness measurement system of elevator rails is developed, which realizes the measurement automatically. The main contributions of this dissertation are:1 A method to measure the straightness error, which bases on the collimation laser of semiconductor single-mode optical fiber, is presented. The output beam characteristics of a semiconductor laser and the laser beam collimated by the single mode optical fiber are analyzed separately. The beam receiving device which adopts four-quadrant detector is discussed.2 Based on the design of the each components of the instrument, this measurement system is developed. Meanwhile several data processing methods are shown. The data auto-processing is realized through software written with VB6.0.3 Through the experiments of stability, repeatability, comparison and fieldwork, the reliability of measurement system is testified. The improved methods are presented as well.