Research On Recognition System Of Scrap Metal Based On Dual Energy X-ray Separation Technology

With the rapid development of metal resource recycling industry, the resource-environmental pressure caused by the mining of native mineral resources has been reduced, and the sustainable development of the economy has also been promoted. Separating scrap metal materials is the precondition of metal resources recycling. The development of metal resource recycling industry in China is restricted by the relatively backward scrap metal separation technology. In order to realize the effective separation of scrap metal materials, dual-energy X-ray transmission technology was studied in this paper. The details are as follows:(1) Based on the theory of dual-energy X-ray transmission, the curve fitting method and double energy R-value algorithm were analyzed. A new algorithm about R-value curve fitting was proposed,and the actual effect of this algorithm was conformed. As a result, the accuracy of scrap metal materials’ identification was improved.(2) Based on image processing technology, the X-ray transmission signal scanned by linear array detector was processed. And the distortion correction and image feature extraction of the materials’ images were completed to figure out the positions of moving materials effectively. The matching method about the positions and types of metal materials was also studied.(3) Based on dual-energy X-ray transmission technology, the software system of material recognition was developed, including the control and communication modules of the X-ray source machine, line array detector, conveyor and the separation device. According to the results processed by recognition software system, the separation device was controlled to realize the efficient separation of scrap materials.Finally, recognition system was verified by the experiments in this paper. According to the results of the studies above, scrap metal materials can be identified effectively.