The Structure Design And Analysis Of New Track Inspection Instrument Base On 3D Track Checking System Of The CPIV

CPⅣ track reference network with pretty high accuracy at the present stage not only provides measuring basis for the delicate adjusting of track slab, but also applies in the 3D track checking system. However, there is no a complete checking system has been formed yet. Furthermore, track inspection instrument as a systematic inspection tool is mainly applied on track checking system of the CPⅢ, lack of progress of the further development for the 3D track checking system of the CPⅣ cannot be ignored. Hence, it is extremely important that developing a set of complete 3D track checking system of the CPⅣ as well as researching one kind of track inspection instrument for both track checking system of the CPⅢ and CPⅣ.This work found the deficiency that existed in the detection principle of track checking system of the CPⅢ via analyzing this system and mathematic model with coordinate system matrixing established from the station freely setting of the total station, and based on it, a mathematic track checking system of the CPⅣ with high accuracy has been modeled. The methodology of it could be concluded as directly capturing CPⅣ reference network prism utilized a total station fixed on a track inspection instrument which cleared up the complex adjustment calculation and station error brought by the station freely setting of the total station in 3D track checking system of the CPⅢ, simplifying the mathematic model of checking system adapted the principal of Euler angle and forward and reverse solve of rigid motion equation which could quickly work out the coordinate system of the track detection point and the track midline, testing and verifying that the accuracy of track checking system of CPⅣ is higher than CPⅢ through data comparison. Based on above, combined the deficiency existed in the mechanical structure of traditional track inspection instrument, this work made the new frame of Y-shaped as a once casting structure within lower center of gravity; utilized three totally same standard cylinder type walking wheels to design and improve the walking wheels mechanism, and one positioned wheel device has also been designed to replace the ex-circle ring of the walking wheel in the double wheel component for this mechanism;the triangle base design shared with prism column and the total station accorded with not only the requirement for the track inspection instrument in both 3D track checking system of the CPIII and CPIV, but made the assembling and disassembling quickly possible for triangle base, prism column and the total station.Last but not least, the validation of the new track inspection instrument has been verified by analyzing the mechanical structure and performance of it,and checking the strength of the connecting bolt, the central axis inside of guide wheel and transmission axis in key parts, what’s more, via the finite element analysis for both the Y-shaped frame of the new track inspection instrument and T-shaped frame of the traditional one, the optimization of the new Y-shaped track inspection instrument has been done with the improved rigidity; after the central axis inside of the positioned wheel designed inside of the new track inspection instrument has also been optimized in terms of the data obtained from the finite element analysis for it, radial elastic deformation has met design demand of the railway track inspection instrument; thus, the feasibility of the track inspection instrument has been further proved that the new instrument could be perfectly applied in both 3D track checking system CPIII and CPIV.