Research And Implementation Of Automatic System For Solar Dicing By Laser

With the rapid development of the photovoltaic industry,the output of solar cells(hereinafter referred to as “cells”)has been increasing year by year,and the amount of solar cell fragments(hereinafter referred to as “fragments”)generated during its production has gradually increased.Solar photovoltaic modules are electronic wastes that must be collected and recycled.Existing fragment processing methods have problems such as environmental pollution,low efficiency,and poor adaptability.It is difficult to be required for fragment green recycling.Considering that fragments can be cut into useful small wafers by laser,the system will be designed and experimented in this dissertation.Based on the combination of verification and laser processing technology,combined with the visual servo technology,the automatic solar laser scribing(hereinafter referred to as "dicing machine")system was studied and implemented.The characteristics of fragmentation and the shortcomings of the existing mechanical processing methods is analysed in this dissertation;it is based on the visual servo technology and combines it with laser processing technology.The high-precision and high-efficiency processing of fragments is completed;the modular design concept is adopted,the system of dicing machine is divided into mechanical system design and control system design;the Soildworks software is used to complete the modeling of the mechanical system;the ANSYS software is applied to realize the optimization of key components.By adopting the open control architecture system,the design of the control system based on "IPC + Motion Control Card + PLC" is completed in this dissertation.To optimize the control performance of the motion control system and the quality of laser cutting,Based on the lumped parameter modeling method,the mathematical model of the ball screw secondary motion system in the laser cutting device is established;based on the sliding mode control(SMC)method,a double-power sliding mode approach law(DSMC)method is designed,and the PID method and the DSMC method are tested and analyzed;in order to enhance the control performance of the system,Based on the in-depth study of the laser cutting characteristics,a fuzzy adaptive double power sliding mode control(FDSMC)method is proposed for the fuzzy relationship between laser cutting depth,speed and control gain in the DSMC method,and its performance is discussed.Conduct experiments and results analysis.