The Design And Research Of Electronic Belt Weighting Control System In Tobacco Line

The measurement and control system of electronic belt scale for the tobacco factory applications is prudently studied which is based on the sufficient understanding of the domestic and abroad development of electronic belt balance as well as the advanced applications utilized in the field of tobacco industry. The weighting principle of electronic belt scale is deeply analyzed, especially the error detection and reduction methods. A high-precision dynamic measuring control system of electronic belt scale, SIEMENS S7-300 PLC as control center, is systematically designed.The design methods and general requirements of the novel electronic belt scale are developed accorded with the technological characteristics of the programmable logic controller applied internationally and domestically. The features of dynamic measuring control system are analyzed, and then the structure of belt scale system is chosen which is regarded as suitable for the tobacco industry. As to the hardware, the SIEMENS S7-300 PLC was concerned as the controlling core, dual-sensor pairs of roller weighing no fulcrum weighting system as balance platform, SEW high-speed rotary encoder for belt velocity measurement, the mechanical step less automatic correction system for data correction, state-of-art HMI from Japan as control interface the motor reducer unit of SEW company and RITTAL standard industrial control cabinets, Germany, and Mitsubishi inverters, merit-based matching of host computer and system hardware all for the control system.On the aspects of system in software, the PLC software is designed and debugged in the compiling environment of S7-300, SIMATIC STEP7 V5.4 and all the functions, the monitoring software of HMI and hardware configurations of the system are realized with the configuration of SIMATIC in hardware. With the study of practical domestic and abroad applications in electronic belt scale, the cutting edge technologies of frequency conversion velocity modulation, pulse measurement, touch-screen as HMI and PLC are organically and efficiently integrated as a whole.On the shoulder of implementation of system designing requirements, furthermore, the effect of non-target parameters such as the temperature for measurement accuracy are studied, the temperature and voltage fluctuations are taken as a non-target parameter which is on the behalf of enhancing the stability of data detection. The simulation experiments are successfully fulfilled and c with pressure sensors of non-linear compensation for improving the stability of data measurement by using RBF neural network method, which is also considered as valuable for control industry.The operation of the system is proved to be stable and successful by the electrical installation and debug of the design of "electronic belt scale monitoring and control system" on the spot. All of the functions are realized with no accident. The control system with PLC is proved to be positive for the insurance of product quality and efficiency by real application. Hence, and higher practical value, but the excellent advantages like reduction of the project cost, improvement the cost-effective and high value for industrial options are all attributed to the significant control performance of the electronic belt scale system. .