To solve the problems of low efficiency, high labor intensity, and poor working environment in plywood production, a surface defect repair equipment for plywood based on visual detection and automation control technology to improve the surface quality and production efficiency of plywood was designed. The equipment mainly included a visual detection and intelligent control system, a positioning system, an extrusion system, and a repairing mechanism. The visual detection and intelligent control system identified the size and position of defects through visual detection technology and generated corresponding G-code instructions (the most widely used CNC programming language for computer numerical control machines), which were transmitted to the positioning system and extrusion system. The positioning system used the CoreXY mechanism (dual motor drive (Motors M1 and M2), timing belt drive, X-shaped structure), and the system received the instructions and controls the repairing mechanism to determine the defect repair point through the coordination of M1, M2, and Z motors. The putty extrusion machine of the extrusion system was used to realize stable extrusion and even coverage of the putty at the defect site. The test showed that the detection accuracy of the equipment for holes, cracks and other defects reached 97.1% and 70.6% respectively, which can effectively cover the surface defects of the plywood and avoid large areas of coating. The repaired plywood is superior to manual repair in terms of putty residue, usage and repair time, providing an effective solution for the automatic repair of the plywood processing industry.
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