Research And Development Of Control System For Photovoltaic Glass Round Hole Chamfering Machine Based On Machine Vision

With the rapid development of the photovoltaic industry,problems in the production of photovoltaic glass,such as low yield,poor processing quality,complex operations,and low degree of automation,have become increasingly obvious,resulting in low production efficiency and quality of photovoltaic glass.In order to improve the automation and quality of photovoltaic glass production,this paper studies a machine vision-based automatic photovoltaic glass round hole chamfering method,and introduces its overall scheme design and the realization of key technologies.The main research contents are as follows:First,research the processing objects and manufacturing procedures of the photovoltaic glass round hole chamfering equipment.Based on the photovoltaic glass chamfering processing technology and equipment requirements,the overall plan of the photovoltaic glass round hole chamfering machine is proposed;the control and the structure of the equipment are designed,and the basic hardware platform of the upper and lower computers of the equipment is selected.Aiming at the problem that it is difficult to accurately locate in the chamfering process,this paper builds a machine vision precise positioning system.Firstly,the hardware of the visual positioning system was first selected,and then the camera calibration method and calibration experiment were studied.Then according to the positioning requirements,the algorithm based on edge extraction with Canny operator,sub-pixel Gaussian curve fitting and least squares circular fitting was studied,the experimental results of the algorithm show that the algorithm is feasible and its positioning accuracy is 83.2%,79.5% and 5.7% higher than that of the direct fitting method in the X direction,Y direction and circle radius.which lays the foundation for the equipment to accurately locate the position of the circular hole.To realize the control model of the automatic photovoltaic glass round hole chamfering equipment,a software system architecture model is proposed,then the program and UI design of the PLC software and the vision software are completed respectively.Finally,the visual positioning software and processing of equipment are analyzed.The experimental results show that the vision system positioning success rate of the photovoltaic glass round hole digital chamfering equipment designed in this paper reached 99.3%,and the processing success rate of the equipment reached 94%,and the product qualification rate reached 96%,which is 4% and 20% higher than non-visual positioning photovoltaic glass round holes chamfering equipment and meets the equipment’s design requirements for processing stability and quality.In addition,the single glass processing time of this equipment reaches14.8s,which can meet the requirement of 4 pieces per minute for assembly line.Therefore,it is concluded that the performance of the glass round hole digital chamfering machine developed in this paper meets the production requirements.