| The design and research of chemical tower equipment has an important status in chemical engineering and petroleum mechanical industry. The development of parameter design and drawing of CAD system for chemical tower equipment is very important on progress in chemical machine. In this thesis, the properties, function and key technology of developing process in chemical tower equipment CAD software are introduced in detail. This professional CAD software is based on AutoCAD 2000 software platform in the Windows 2000 system. And the paper discusses the technology.The software's development takes advantage of ObjectARX 2000 which is the newest language in the second development of AutoCAD at present. Through the programming environment of Visual C++ 6.0, the Visual interface design of the software is realized. ObjectARX 2000 is a development tool of AutoCAD 2000 software platform, which is supported by Autodesk company and can support Object-Oriented programming, using C++ , visit and control AutoCAD directly, then develop the software based on drawing interface. This method of development has integrated the following two advantages -one is powerful image displaying displaying and compiling function under AutoCAD ambient, it can operate drawing database by using class and standard library offered by Autodesk company, to realize drawing function. And the other is design CAD system efficiently by making great use of the resources of Windows , class of MFC and visual program tool. For these reason, ObjectARX becomes the prior tool in the secondary development of CAD.In modern mechanical CAD, parametric design which adopting the idea of Object-Oriented Programming is widely used. By analyzing the process of design,we can find that it has characteristics, such as the main parts and components of the chemical tower equipment have a little changes according to the structure of different series. Their size and specification can also be found from database. So we can create a parametric system of design and drawing, and realize drawing by gaining the main parameter.In the process of design Interface, the methods of realizing the Visual interface design by combining ARX(AutoCAD Runtime Extension) and class of MFC are analyzed. The techniques of AutoCAD menu development and start interface development are also discussed. At the same time, the paper discusses the essentials of technique , for instance, modification , stability and dynamic updating of data.The process of programming uses Object-Oriented programming idea, processes the modularization technology. During the course, the key technology and development are discussed, such as the technology of Object-Oriented programming, the interface technology of the parametric CAD system, the modularization idea, the method of realizing parametering design of CAD system, the techniques of ARX and MFC combination, the technology of process basic function module, the foundation of database, and so on. The process of development includes selecting main parameter, function building, data searching, body drawing and database operation, and so on.The software accomplished parametric design of the chemical tower equipment, established engineering database, and realized design and drawing automatically. The important features and capabilities of this CAD system include, according to radical parameters of design, the design system can extract data from assigned database automatically, generate draw in AutoCAD by using easy-use friendly interactive interface. When the parameters are changed, the software will search data and calculate parameter again, and create new draw rapidly.At last, we use the software time and again by different parameters. Under the above foundation, the system has a friendly interface, simply operation way, powerful function and runs safely, realizes parametric design and draw from data to draw. The software can not only save the time and energy of designers, but also reduce factitiously mistake of design or drawing, speed up the proceeding o...
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