Research On Measuring Method Of Tooth Profile Deviation Of Large Gear Based On Large Space Measurement Technology

Large gears are the key transmission components of heavy machinery such as shield machines,hydro-generator sets,and ships.The detection of large gears has always been the focus of research in the field of mechanical measurement.Aiming at the problems that the measurement reference in the measurement process is difficult to be determined and the guide rail of the measuring equipment is too long due to the oversize of the large gear,this paper proposes a combined followup gear measurement method based on the large space measurement technology.The research content of this article is as follows:(1)A combined follow-up gear measurement method is proposed,the overall structure of the measurement system and its components are introduced,and the establishment of the gear measurement coordinate system is described.(2)An iterative model of the gear center was established to solve the problem that the measurement reference was difficult to determine during the measurement of large gears.Simulation experiments were designed to verify the correctness of the iterative model of the gear center.(3)On the basis of in-depth research on the existing tooth profile deviation measurement methods,the radial polar coordinate method is used to realize the tooth profile deviation measurement of large gears,which solves the problem of excessively large gear measuring equipment guide rails.(4)The measurement method of the follow-up gear measuring equipment was described,and the mechanical structure of the follow-up gear measuring equipment was introduced.The design of the related hardware circuits such as stepper motors,encoders,circular encoders,and inductive displacement probes was completed.Measurement and control software for gear measuring equipment.(5)An experimental platform was designed and built to verify that the combined follow-up gear measurement method can be used to measure the tooth profile deviation of large gears,and the developed follow-up gear measurement equipment meets the accuracy requirements of large gears below level 8.