Research On Automatic Detection System Of Structural Parameters Of Complex Parts

The accurate measurement of the structural parameters of complex parts is of great significance in industrial production.The use of manual detection of the forming size of parts is not only inefficient but also low in detection accuracy.In order to quickly measure the structural parameters of complex parts online.Taking the ceramic shell of the temperature controller as the research object,the machine vision combined with the laser-assisted method is used to study and design the automatic detection system for the structural parameters of complex parts.The main research contents are as follows:1)Research on measuring method of part plane parameters.According to the basic principle of the measurement of the plane parameters of the parts and the structural characteristics of the ceramic shell of the thermostat,the plane size measurement scheme is designed.A single camera is used to capture the image,and the circular structure in the ceramic shell is identified by the Hough transform gradient method,and the diameter parameter is obtained.The cumulative probability Hough transform method is used to detect the angle information of straight line features.Based on the recognized circle and straight line features,a part placement angle detection algorithm is designed,which can detect the rotation angle of the ceramic shell placed upwards in real time.2)Research on measuring method of three-dimensional parameters of parts.According to the basic principle of laser triangulation measurement of three-dimensional parameters,a method for measuring the depth of the internal groove of the part is designed.This method uses the spacing between parallel light spots to obtain the three-dimensional parameters of the part.The three-dimensional parameters of planes with different heights can be measured simultaneously.3)Design and implementation of structural parameter detection system.According to the structural characteristics and measurement requirements of the temperature controller ceramic shell,the hardware structure of the detection system is designed.Aiming at the problem that the on-line detection of ceramic shells requires manual adjustment of the angle of the parts,a multi-laser ring light path projection structure is designed.There are eight straight-line lasers in different directions in this optical path,which can fully cover the rotation angle of the ceramic shell from all directions.Combining the ring light path structure and the angle detection algorithm,a laser adaptive projection algorithm is designed.It does not need to manually adjust the rotation angle of the ceramic shell,and automatically selects the laser projection in the appropriate direction to measure the inner groove depth of the ceramic shell.4)Test the diameter,distance,angle and depth parameters of the temperature controller ceramic shell through the test platform.Experimental data shows that the detection accuracy of diameter and distance is within 0.007mm,the error of angle recognition is not more than 1°,and the accuracy of depth measurement is less than 0.01mm.