AOI inspection machine is the use of computer technology, high-speed image processing and identification technology, automatic control technology, precision mechanical technology and optical technology integration to form a comprehensive detection technology, with a high degree of automation, fast detection and high-resolution detection capabilities, can reduce labor intensity, improve the accuracy of discrimination, has good generality, is a key procedure of SMT. Can be divided into precision mechanical system, control system, image processing system, software system 4 major parts.
1. Precision mechanical system
In the inspection of each PCB board, the AOI system of the table to automatically move to the camera position, image ingestion action, even if the program has been set up with these actions related to data, but if the mechanical movement of the parameters have changed due to changes in precision, it will lead to the failure to complete the correct detection process. In order to achieve accurate operation of the precision table, a precision ball screw driven by an AC servo motor and guided by a rolling linear guide is used to achieve closed-loop control of position.
2. Control system
The control system of AOI is composed of main control computer, motion control card, image card, I/O interface board, etc., to realize 3D coordinate and peripheral I/O interface control, to ensure the accuracy and fast response of the motion, and to realize the function of the whole machine with mechanical and visual modules. positioning, vacuum solenoid valve automatic control and other functions.
3. Image processing system
The image processing system is called CCD vision system, which is mainly composed of camera, image card and LED programmable light source. The video image signal acquired by the camera is transmitted to the image acquisition card, which is controlled by the image acquisition card to complete the image acquisition, the main control computer will collect the video image processing, the results will be returned to the main control program, through the display can be real-time observation of the image and complete other corresponding control processes.
4. Software system
AOI software system mainly consists of motion control, visual processing and algorithms, the user can complete a variety of motion control, visual recognition through the window interface, AOI system software supports process data programming, process programming can be achieved WYSIWYG characteristics, support a variety of ways of operation simulation and simulation, so that the operator to verify and test the operational data before the batch operation, to avoid leakage and mis-inspection It allows the operator to verify and test the operation data before the batch operation, avoiding missed inspection and false inspection.
