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Beijing Sino Metal Material Co., Ltd. to fly an aluminum wire drawing machine wire live sets production equipment is consensus core equipment, mainly by motor driven reels, the friction generated by the roll, the raw silk (aluminum or steel) through multi- level drawing dies after stretching, one to put into finished cold-drawn wire filament of a special device. Original equipment is imported second-hand equipment, control technology backward, control accuracy and stability are poor, severely affected production. Live sets wire drawing machine adopts DC motor drag, to achieve a wide range stepless, expanding the selection of rolls range between elongation and looper in the drawing process for each reel have had a Rally or reverse tension. There is a looper looper tension and anti-pull tension, the pulling force can reduce, extend life and reduce the kinetic energy of the drawing dies consumption. This study is based on live sets wire drawing machine basic working principle, the use of company SIEMENS S7-300 series PLC, most high-end S7-318-2DP, fully digital DC converter 6RA70 and HMI TP177B, to design a system based on Profibus-DP, bus speed and torque of double-loop DC speed control system, can be a good solution to the motor starting process and the steady-state operation, and to ensure that the system, in theory, the motor speed no static errors. The system leverages the advantages of digital DC speed and improve the quality of drawing and drawing speed. Main tasks are as follows: (a) processing technology from aluminum wire and wire drawing machine structural characteristics start using tension - Speed ??- Torque three closed loop DC scheme, in-depth study of the tension control and speed control principle, complete closed-loop tension and incremental digital closed-loop speed PI regulator design, and gives the system design diagram. (2) Based on company SIEMENS S7-300 series PLC, most high-end S7-318-2DP, fully digital DC converter 6RA70 and HMI TP177B, the design of the system hardware circuit, including the main circuit and control circuit. At the same time by the tension - Speed ??- Torque three closed loop DC algorithm, Profibus-DP, bus communication, the operation of the various parts of the logic device control software, gives the system software flow chart of each sub-module implementation. (3) in the original machinery and equipment on the basis of: to achieve the whole apparatus of the electronic control system set up, completed the overall debugging, to protect the security and stability and efficient operation, gives the application results and conclusions. The system has been successfully applied to Beijing Sino Metal Material Co., Ltd. to fly an aluminum wire drawing machine wire live sets. Application results show that: the control system hardware structure more simple, easy maintenance, more stable, more convenient operation, improve the operating rate and the full realization of the real-time automatic control.
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