of the 10 industry machinery industry, whether it is production, or variety, have achieved attract people's attention achievement, has provided the powerful safeguard for the rapid development of China's food industry and packaging industry. At present, China has e one of the world's food and packaging machinery industry production and consumption country This paper to plastic packaging machine as the main research object, design system of this kind of packaging machine sealing mechanism of main transmission mechanism, including a two stage expansion design and cam type conical cylindrical gear reducer, puts forward the design method and form plete design of key parts, finally draw the 3D model by using UG software. Keywords: plastic packaging machine, two stage reducer; cam mechanism; UG
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