| Carrying-saddle,one of the most important part of the freight trains, which are installed between wagons'rolling bearings and bogie side-racks, have an important impact on train's speed, loading and security . Therefore, it is necessary to eaamine and repair carrying-saddles in time, in order to guarantee the running securities. Currently, the detection of carrying-saddles is mainly using template for manual testing,this method of detection is intensely and more inefficient.To seek for new measure way of carrying-saddle's size, this article used the technology of phase measuring profilometry, proposed a kind of untouched measure system. Therefore, we research the key techniques of the structured light system based on digital fringe projection, including phase calculation, system parameters calibration and 3D data reconstruction. For the inspecting reauirements of the carrying-saddle measure, the measuring terminal consists of a multi-set structured light measure system, measuring from the upper and lower sight respectively; In order to improve the efficency of the measuring terminal, we designed a turntable to realize the registration of measurement data automatically; and we also developed a software for the detection system, enhancing the automation and efficiency lever.This article proposed two methods for the turntable calibration. One is using a standard ball on turntable to calibrate rotation axis and rotation angle; another is using calibration board to obtain coordinate transformation matrix by the singular value decomposition, which could get high accuracy of calibration by experimental analysis.This system is able to inspect the 3D data of the carrying-saddle real-time and automatically. Furthermore, the inspecting data are fitted automatically to calculate the key abrasion of part and meet the inspection requirement. It provides a new inspecting way of carrying-saddle and it is able to replace the traditional handwork. |
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