The Design And Implementation Of Control System Of Wire-Grinding Machine And Wire-Stripping Machine Based On PLC

With the development of automatic control theory and PLC technology, the PLC control technology which has the advantages of use easily, powerful function, high reliability, strong expansion,wide applicability and the simplicity of building a control system and so on, has got a broad application increasingly.During the study time of graduate, the author has finished the research work of two projects which are wire-grinding machine and wire-stripping machine. Both of the systems are based on PLC technology. These are the backgrounds to this article which mainly discusses the application of the PLC control technology, and the following research work is completed.First, this article gives a overview of PLC control technology about it's generation, development, status quo of application at home and abroad, and the contrast with other control technique. The source, background, status quo of research at home and abroad, significance of research about the two projects, the control system of wire-grinding machine and wire-stripping machine, are introduced.Second, a method which is suited widely about the design of control system based on PLC is covered. Starting with the structure and design principle of control system based on PLC, analyzes the method and steps of hardware design and software design emphatically.Third, the design which includes the overall design, hardware design and software design to the control system of wire-grinding machine based on PLC is implemented. During the system's overall design, a method of multistage wire-grinding is proposed, and the theory of calculating wire diameter is also analyzed. The selection of PLC equipment, I/O distribution, PLC wiring diagram, the wire diameter detector, analog input module and servo amplifiers are belong to the system's hardware design. The software design to the system includes the design of many modules of PLC program and many human-machine interfaces.Fourth, the design which includes the overall design, hardware design and software design to the control system of wire-stripping machine based on PLC is completed. To the system's overall design, calculating the pulse number of stepping motor is analyzed. What's more is that the method of speed curve like ladder controlling stepping motor is used also. The design of hardware to the system includes the design of reducing PLC input numbers, the selection of PLC equipment, I/O distribution, PLC wiring diagram, stepping motor and so on. The design of software to the system is the design of PLC program which includes main routines, two segments wire-stripping module, three segments wire-stripping module, functional pressed keys module and the input module of digital pressed keys and so on.Since the control system of wire-grinding machine based on PLC began to process wire, the system which last about half and one year runs stably and reliably, and the production has a high quality. According to the user's identification (referring to appendix), this system's performance index has arrived at the same level of this kinds of products in foreign. At present, the control system of wire-stripping machine based on PLC is in an advanced state of debugging and development. As it is developed successfully, it will bring a great beneficial effect to the economy.