| In this paper, the control system of the asphalt concrete mix plant based on the construction machinery group is developed, which plays an important role in national fundamental construction. In favor of 863 state program "machine group intellectual construction machinery", the control system of the asphalt concrete mix plant as one of the core technologies is researched and the hardware and software of the control system is developed. The dissertation combines theoretical analysis, control method and design skill. The main works are as following: 1. The task, function and the technical requirement of the control system is presented based on the production process. The master-slave frame is constructed. The slave is programmable logic control system,and the master is a industrial control computer. 2. The key technology of the field control, which consists of equipment startup and shutdown, metage, mixing, transportation, serial communication modules, is introduced, and the program is designed by STEP7. 3. The supervisor and information management software of the master is developed under the Windows platform by Microsoft Visual C++. In former module multithread unlogged serial communication is realized with the user-defined serial port class called Win32 API functions. In the later module the ADO technology is adopted to manage the ACCESS databases, which stored recipes, production report, error recording etc.. 4. The metage as one of key technologies is discussed. The control strategy of double self-leaning is given according to the model of the weight process. The asphalt mixer can be weighted precisely by the proposed method. 5. The communication technology of the plant in the network of the machine group is discussed. And the net interface is designed. The control system of asphalt mix plant is successfully developed and tested. Engineering application shows that it has good performance and stability, and meets the demand of the building of first rate highroad. |
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