The development and application of mechanical equipment is to make up for the lack of manual work. The visual inspection system can successfully complete the accurate and rapid measurement of micro size, shape matching and color identification, which are tasks that cannot be completed by human. Machine vision detection technology is to capture the image by CCD camera and send it to the computer or special image processing module. Through digital processing, the size, shape and color can be judged according to the pixel distribution, brightness, color and other information.
What are the advantages of visual inspection system in detection?
The parallelism and perpendicularity of large-scale workpiece is measured by laser scanning and CCD detection system. It takes the stable collimating laser beam as the measuring baseline, and rotates the pentagonal prism to sweep out the parallel or vertical datum plane, and compares it with each face of the measured large workpiece. When machining or installing large workpieces, it can be used to measure the parallelism and perpendicularity between surfaces.
In this system, the flash is used as the illumination light source, and the area array and linear array CCD are used as the detection devices of the outline dimension of the hot-rolled deformed steel bar.
The real-time monitoring of bearing condition adopts visual inspection technology to monitor the load and temperature changes of bearing in real time, so as to eliminate the danger of overload and overheating. This technology changes the traditional passive measurement to ensure the machining quality and safe operation by measuring the ball surface into active monitoring.
The intelligent integrated test system of instrument panel assembly based on machine vision is equipped with speed odometer, water temperature meter, gasoline meter, ammeter, signal alarm lamp, etc. on the automobile instrument panel assembly, its production batch is large, and a final quality inspection is required before leaving the factory. The detection items include the indication error of five instruments such as speedometer, whether 24 signal warning lights and some lights are damaged or missing. The intelligent integrated test system of machine vision inspection system technology has changed this situation, realized the intelligent, automatic and fast quality inspection of instrument panel assembly, overcame various errors caused by manual inspection, and greatly improved the efficiency and reliability of detection.
The automatic flaw detection system for metal plate surface, when testing special large metal plate with high surface quality requirements, the original detection method is manual visual inspection or dial indicator plus probe. This method is not only easily affected by subjective factors, but also may bring new scratches to the tested surface. The automatic flaw detection system of metal plate surface uses machine vision inspection system technology to automatically inspect metal surface defects. It can detect metal surface defects at high speed and accurately in the production process. At the same time, because the system adopts non-contact measurement, the possibility of new scratch is avoided.
In this system, each laser and camera unit is calibrated offline. At the same time, there is a calibration device calibrated by CMM in offline state to calibrate the camera online. The detection system can detect three types of car bodies at the speed of detecting one body every 40 seconds. The system can test three types of car bodies Compared with the qualified dimension extracted from CAD model, the measurement accuracy is ± 0.1 mm.
The inspection system for the surface quality of car body is composed of direct phase acquisition of projection grating, high-speed digital image processing, automatic recognition of surface defect image pattern, intelligent quality judgment, adaptive system learning technology, loose self-adjusting software and hardware structure and robot system control technology. The system can complete welding on the production line with transmission speed of 5m / min On line inspection of BIW.
There is no doubt that the technology of visual inspection system has made great progress in improving the level of automatic production and intelligent detection. In the future, the development space of automatic visual inspection system technology will also be promising.