Research On Key Technologies Of Laser Projection Instrument Measurement And Control System

The laser projection device makes use of the biaxial galvanometer’s high-speed deflection property to scan and project the laser beam point by point in accordance with the predetermined angle,producing sharp laser contour graphics with precise positioning on the target surface.With the help of this technology,the manufacturing and assembly workpiece is positioned precisely,and the operator may complete intelligent and digital manufacturing and assembly activities more quickly and accurately.However,in the actual assembly site,the large reciprocating reversal of the vibrator will result in the Angle deviation and shape distortion of the projection figure,which significantly reduces the accuracy and effectiveness of auxiliary assembly positioning when the laser projection instrument is projecting a large range of complex workpieces.In this paper,a new laser projection instrument measurement and control system is built in order to guarantee the graphic accuracy and position accuracy of laser scanning projection,and key technologies such as the calculation method of coordinate transformation relation and the correction methods of graphic distortion and graphic angle deviation are studied.The main contents of this article are as follows:(1)The causes of contour deviation at the corners of projected graphics in laser projection instruments are analyzed,and an adaptive path interpolation method based on calculating curvature and normal vector is studied.By calculating curvature and normal vector information,corner point coordinate data and corner angle information are identified from coordinate data points,and corner point adaptive path interpolation without abrupt commutation is realized.(2)The optimization and dilution approach of scanning path data based on hydudinal compression is investigated in order to increase the display frequency of scanning projection graphics after adaptive path interpolation.Using adaptive interpolation,simulation and experiment findings demonstrate that the scanning path data points can be reduced to 51.92% of the original data volume,shortening the adaptive path’s scanning time.Also,the complex multi-image scanning projection’s laser on-off logic is investigated and established.(3)The geometric distortion of vibroscope scanning projection technology is studied,the mathematical model of vibroscope scanning projection is evaluated and established,and a geometric distortion correction method based on least squares is developed for scanning projection graphics.The experimental findings indicate that the adjusted projection graphics’ shape accuracy is greater than 0.5mm and their display frequency is better than20 Hz.(4)The vibration mirror coordinate system and the projection face coordinate system’s coordinate transformation matrices are solved,and the actual position accuracy of the projected figure is better than 1mm as a result of the study of the coordinate transformation relation solution method for artificial bee colony nonlinear optimization.(5)The STM32L431CBT6 main control chip served as the foundation for the measurement and control system for the laser projection instrument,and tests for testing the system’s performance and functionality were developed.The trial findings demonstrate that the planned measurement and control system is capable of completely correcting the image scanning distortion as well as eradicating the Angle contour deviation of the projection figure.The projection figure’s location precision is better than 1mm,and both its shape and location accuracy are better than 0.5mm.