关 键 词：滚动轴承，视觉检测，装配缺陷，DSP，硬件设计
HARDWARE DESIGN OF EMBEDDED VISUAL DETECTION SYSTEM FOR DEEP GROOVE BALL BEARING ASSEMBLY DEFECT
ABSTRACT
China is the world's largest producer of bearings, the bearings industry has become an important economic component. But in comparison with foreign countries, there still exists a wide gap of the technology level of bearings production between ours and the foreign ones, especially in the automatic control and quality control of assembly defect.
Currently, the degree of automation is increasing in bearings production, while the traditional manual method of detection is difficult to guarantee the quality of their product. The technology of machine vision detection with a speediness detection, high precision, non-contact advantages, will be applied to the automatic detection of bearing assembly, can effectively overcome the shortcomings of artificial detection way, improve the efficiency and quality of production. Visual detection system have to complete on-line detection of bearing, so that we have to improve the visual image processing speed; Digital signal processor (DSP) can be well complete the detection task for bearing in automatic production line.
The leakage of rivets and rolling balls are the most common assemble defects in the automatic assembly process. In response to this problem, the design will developed an online automatic testing system for detecting the leakage of rivets and rolling balls, by using lamp-house, CCD camera, DSP chip and other external chips. The design made analysis about lighting techniques, image acquisition, video decoder chips, the selection of DSP chip, further, designing some functional circuit module. The system has integrated function, simple structure, flexible programming features to satisfy the demand of real-time detection. The design is expected to be an important technical reference for resolving the technology bottle-neck of detecting the missing rivets and rolling balls in bearings enterprises.
KEY WORDS: rolling bearing, visual inspection, assembly defect, DSP, hardware design
