Research Of Container Crane Automatic Positioning Control System System Based On BPS

With the rapid development of logistics globalization, the traditional manual operation doesn’t meet the demand of sustained high-speed container throughput development. In order to solve the problems of the long period, low efficiency and positioning difficult existed in the course of container load and unload operation, a type of container crane automatic positioning control system which based on BPS (barcode positioning system) was proposed. Instead of human eyes, positioning barcode was used to measure the positioning of each operation mechanism of container crane. With the container crane automatic positioning control system, the automatic container loading and unloading operation was realized and the yard handling efficiency was improved greatly.Based on the functional requirements of system, the simulation laboratorial platform was built, the overall design of the system was completed. According to the theory of the barcode displacement, the design steps of positioning barcode was analyzed, the installation of the barcode position system on container simulation platform was finished. Finally the design method of control program was completed with Unity Pro XL. The concrete research content was as follows.1. Interrelation between one-dimension bar code and two-dimensional bar code as well as the difference of both were described in detail. According to the characteristics of guided positioning of crane cart and car operation, one-dimension bar code was chosen as the localization bar code, laser scanning equipment was chosen as the barcode recognition equipments.2. According to the work flow of container crane automatic positioning control system, the demand for functions of system was analyzed. The system was divided into:barcode positioning system, automatic control system for crane and interface of human-computer interaction operation and real-time supervise. Lastly, on the basis of the analysis mentioned above, the whole structure, logical structure was built.3. In order to reduce related cost and risk of the system development. In the thesis, a mechanical model in 1:15 scale penetrates of crane container was developed as the hardware basis of system development. The mechanical model consists of mechanical parts and electrical parts, and could hoist the container model, just like the real container crane.4. According to the displacement coding theorem, the location information was transformed into the selected one-dimensional code through the channel coding and the source coding. With the example of Code39 barcode, the encoding and conversion of digital- position information in the process of displacement encoding was discussed by using Visual Basic and the character encoding mapping.5. The automatic control system for crane which based on Schneider PLC was designed. The control circuit diagrams of mechanisms of crane cart, car and hoist, which including the safety limit switch and start switch. Finally the design method of control program was completed with Unity Pro XL. With the sequential control design method, the PLC ladder diagram, which based on the real-time position feedback of of crane cart and car, was designed by using Unity Pro XL. The design of interface of industrial PC control system was completed by using industrial configuration software WinCC, which had high portability and a better man-machine interface function.