基于平行四边形机构的车轮几何参数自动测量方法的研究

提出了一种新的车轮几何参数的自动测量原理。利用平行四边形机构的平动特性，在测量框架上部安装多套平行四边形机构和相对应的激光位移传感器，实现车轮在车间内行走时，对其踏面任意点直径、轮缘厚度、踏面磨耗及擦伤、轮辋宽等几何参数的自动测量。采用通过式测量方式，改变了已有旋转测量方式需要测量平台和轮对支撑与旋转机构的局面。介绍了主要参数的测量原理和测量系统误差的自动修正方法，给出了测量系统现场试验结果。

NOVEL METHOD FOR AUTOMATICALLY MEASURING GEOMETRIC PARAMETERS OF TRAIN WHEELS BASED ON PARALLELOGRAM MECHANISMS

How to automatically measure geometric parameters of train wheels is a key problem, and it has not solved probably up to now. A novel and simple method for measuring geometric parameters of wheels is put forward. Most key geometric parameters, such as diameters at any given point of the tread, flange thickness, flange height, rim thickness, rim width, wheel flats etc., can be easily gotten by installing parallelogram mechanisms together with laser transducers. Wheels are dragged simply by a chain to pass through the measurement system when the measurement results are done, which has totally changed the situation that a measurement platform is required to support the wheel and makes it rotate in order to take measurements. Methods to calibrate the measurement errors of the system are also discussed, and some in-situ measurement results are given.