| With the development of our nation economy transportation has restricted the economic development one of the factors. We must use advanced technology and equipment, road construction, and constantly improve the level of China's highway construction Because of the growing traffic volume, a variety of heavy, large number of vehicles on our roads asked for china's road more and more high quality requirements. Among the many road construction machinery asphalt mixing station is the largest consumption of resources, high-tech equipment, the sophistication of their equipment so a direct impact on the quality of road construction.Based on the present domestic and international characteristics of asphalt mixing plant equipment, the use of advanced theory and computer simulation of dynamic weighing system on the stone weighing process was more thorough research. The establishment of a dynamic mathematical model of weighing process, and made a computer simulation and qualitative analysis. Process for the whereabouts of a gap between stone and model parameter uncertainty, weighing in on the dynamic process of stone made a further analysis based on the second weighing method and the proposed iterative learning control method, and to control system design and computer simulation study. Simulation results show that the iterative control algorithm is applied to stone weighing control system, can achieve the desired results. Subsequently, because of the control system lag issue, therefore, design and development of the Smith predictor to solve this problem. Finally, more advanced control ideas S7-300 PLC on stone weighing system programming, and through STEP7V5.3 software and S7-PLCSIM simulation software designed for programming and simulation, the simulation results show that this stone weighing system designed to process achieved the desired results.Through this study, stone weighing system greatly improved the control accuracy and efficiency, to achieve automatic adjustment of the control process, reducing the failure rate for high-precision and high efficiency production of large amount of asphalt to provide a favorable condition. |
