Digitalization
The digitization of this paper mainly refers to the acquisition and processing aspects of images. The image acquisition device used in the original laser sensor was an analog CCD. Usually, the maximum frame rate of image acquisition was 60 frames/s or 30 frames/s, so algorithms such as image processing or output control were also limited. With the development of electronics and information technology, as shown in Figure 3, image acquisition devices in laser sensors are gradually adopting more advanced digital CMOS devices, and the image acquisition rate can reach up to 3000 frames/s or 10000 frames/s. It creates conditions for high speed and high precision sensing. At the same time, the digital technology can be used to easily cut the target area of ​​the digital image, and eliminate the interference of other features of the adjacent weld fixture on the weld identification. Therefore, in the case where the surface of the workpiece is bright, the fixture is affected by the fixture or the high-speed sensing requirements such as laser welding, weld formation and defect detection, the laser vision sensor using the digital CMOS image detector has the sensor using the analog CCD. Performance.
2. Anti-reflective technology
Due to the adoption of digital technology, in addition to the greatly improved image quality, some better algorithms can be used in image processing, which can eliminate the interference of bright surface reflection of aluminum alloy, stainless steel, galvanized sheet, etc., and clearly identify The details of joints such as fillet welds and V-grooves are shown in Figure 4. While accurately tracking, geometric parameters such as gaps, misaligned edges and cross-sectional areas of the joints are accurately measured. The laser stripe in Figure 4a illuminates the stainless steel fillet weld surface, Figure 4b shows the image obtained without anti-reflective technology, and Figure 4c shows the image obtained with anti-reflective technology.
Figure 5 shows an application example of a TX/S digital laser vision sensor in adaptive welding of aerospace aluminum alloy large components. The laser vision sensor detects the geometric information of the bevel to be welded, realizes the automatic alignment of the welding gun and the automatic adjustment of the height. At the same time, the welding parameters are automatically optimized according to the detected groove clearance and cross-sectional area and adjusted online. Figure 5a shows the main components of an adaptive welding system. Figure 5b shows the TX/S sensor and its results on a very bright aluminum V-groove, completely eliminating the effects of reflections and accurately measuring parameters such as gaps, misalignments and cross-sectional areas.
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Ductile Spindle Assembly is a crucial part for your lawn mower cutting deck that work together with the pulleys and belts to perform clean and even mowing.
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