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3D CAD technology in the visual design, assembly design, design analysis, has incomparable superiority of the two-dimensional graphic design, such as machining simulation is an important means to improve the quality of design. However, most of the three-dimensional CAD software are universal design software, the lack of design and development of enterprise-specific programs, can not be more effective in improving the efficiency of enterprise development and design. In this case, to the commercialization of CAD software platform for the development of secondary development, so that foreign software tools suitable for the design of mechanical production requirements, has become an important issue faced by the domestic promotion and use of CAD software. Autodesk's Inventor is an excellent mechanical CAD / CAE / CAM integration software. It is based on full composite entity modeling, feature modeling, assembly modeling technology, to design a complex product models. In addition, it also has good openness, different levels of secondary development, rapid and efficient implementation of the special requirements of the user. Based on Inventor 3D CAD platform, for the complex structure of a design institute plant belt conveyor design requirements, the design of a heavy workload, has formed a serialization characteristics developed special 3D parametric modeling of belt conveyor system. The main work of the paper include: First, study the basic theory of the three-dimensional modeling software Inventor: theory of solid modeling, feature technology, Parametric Technology, for the development of the system has laid a theoretical foundation. Secondly, in the content of the general process, the overall design of belt conveyor design selection and component design based on the use of software engineering methods, the overall design of the belt conveyor 3D parametric modeling system. Inventor secondary development method again, according to the Inventor API help documentation, in-depth study and compare the VBA Add-In separate EXE, Apprentice Server's strengths and weaknesses and the scope of application of the secondary development method, the final create a system in the form of plug-in Add-In. Then, to explore the use of Visual C Inventor secondary development method, such as procedures and Inventor connection, dimension-driven, database selection and programming, system inlet design Finally, more research in this paper, developed in the Inventor environment a belt conveyor 3D parametric modeling system, the system has a user-friendly interface, simple and practical. Practice has proved that the system greatly improves the efficiency of belt conveyor design, reduce the workload of the designers, and has high practical value.
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