Key Technology And Experiment Reaearch On Integrated Design Of Time-grating Linear Guide Rail

The linear guide pair is required to achieve real-time location detection and precise location in the high-speed and high-precision linear feed motion.Therefore,integrated design should be applied in the design of linear guide pair and position detecting system in order to realize the integration of the detection technology with the measured system and the system intelligence.However,the transmission chain error can not be quantified which is introduced by the method of measuring the linear displacement by detecting the motor rotation angel at present.The external linear displacement sensor will occupy part of the working space of the system.The precision of traditional displacement sensor is hard to promote which is depended on the precision equal mechanical division and is weak in resistance to environmental interference.These shortcomings seriously restrict its application in industry scene.This project is supported by the National Natural Science Fundation of China,the research status of the integrated displacement sensor in mechanical systems is analyzed,a time grating linear guide rail based on the time-varing magnetic field and a time grating linear guide rail based on TMR components are proposed,which can realize the integrated design of time grating and linear guide rail.Using the time grating sensing technology,the guide function of the guide rail and the real-time position detection function can be completed at the same time in the motion process of the slideway slide block.The method can save the movement space of the mechanism because of no external sensors,and the built-in sensors have high accuracy and strong ability to resist complex environment.Therefore,there is wide market application prospects of the integration design of time grating linear guide rail.The main research work and innovations of this project include:(1)The principle of displacement measurement for time-grating linear guide was analyzed.Based on the transformation principle of space-time coordinate,the measurement models of a time grating linear guide rail based on time-varying magnetic field and a time grating linear guide based on TMR element were proposed.The displacement calculation method was put forward.(2)Combined the detection principle and the structural characteristics of linear motion ball guide,the structure of the time-grating linear guide rail was designed.The 3D transient magnetic field simulation of signal pickup module of time grating linear guide rail based on time-varying magnetic field was carried out.And the structure was optimized by analyzing the simulation results.The static magnetic field simulation analysis of the signal pickup module of the time-grating linear guide based on TMR elements was carried out.The structure and material of the permanent magnet and TMR elements spatial location were determined according to the model of the TMR chip and simulation results.(3)The measurement experimental system of the time grating linear guide rail was designed and the experimental platform was built.The prototype of time grating linear guide rail was processed,and the design of the mechanical system,the measuring system of the slave computer and the host computer system were completed.(4)Experimental research on time grating linear guide is carried out,including waveform experiment,stability test and accuracy experiment.The errors in experiment are analyzed.The result shows that the time grating linear guide rail based on TMR has higher stability and accuracy.In summary,the theoretical derivation,simulation analysis,system design and experimental research are carried out,and theoretical research is gradually transformed into experimental research.It is verified by experiments that the time grating linear guide can detect the displacement of the slider pair.The integration of detection technology and the measured system is realized.