The Research Of Scraper Selecting Based On The Differential Evolution Algorithm

Scraper is widely used in pillar-less sublevel caving due to its high ore drawing efficiency, mobility, flexibility and general, purpose application. In scraper sizing, the mining structural parameter, one ore-caving amount, production capacity and economic benefit are considered by the mines. However, there hasn't been a quantizing calculation method for the selection of the shovel size of scraper and the analogy method has been used widely, the real cases of both internal and external mines have been taken as example, and this data is an unsatisfactory result frequently. Therefore, it would be a significant work to explore the relationship between scraper sizing and the related factors. It can provide scientific basis for the decision-maker in scraper sizing for mines.In this thesis, we want to choose the most optimum scheme from the given scheme set by using differential evolution algorithm with discrete space and constraint handling. Actually it is a multi-objective optimization problem because some economic and technical indexes as ore drawing efficiency, operation cost, engineering investment and equipment investment must be considered in optimization processing. So, in the view of the real fact that sublevel caving is mainly used in China's mines, calculating processing is processed on given schemes set with the shovel size of scrapers being 2m3,3m3,4m3, 5m3 and 6m3 respectively. Three indexes are obtained through the simulation for each scheme, that is, total operation cost, equipment investment and unit-shift efficiency of ore drawing, and we could use this calculated result to set the objective matrix up. And then the weight matrix also could be set up according to their concentration level. Finally, the objective matrix and weight matrix is put into the simulation program of differential evolution algorithm as the initialized parameters and run for enough generations on a corresponding population to calculate the optimum result and make a right decision according to the result.On the basis of study which is made on the extracting equipment selecting of mines using sublevel mining by discrete space and constraint handling differential evolution algorithm, the conclusion is obtained. If the hauling distance is confirmed, when the drift space is 10m, the scraper with 4m3 shovel size should be selected, and when the drift space is increased to 15m or 20m, the scraper with 5m3 shovel size should be selected. Furthermore, with the increasing of hauling distance and drift space, the high performance of scraper with 5m3 shovel is shown obviously.If the optimization algorithm is used on the global given schemes matrix and scraper shovel size vector, the conclusion could be obtained, that is when the hauling distance is 100m, sublevel height is 20m and drift space is 20m, the best scraper shovel size is 5m3 to realize the optimization target. This choice could avoiding the increasing of engineering investment because of using scraper with big shovel size, and in another hand, it also can accord to the present development trend of large scaling of both mining structural parameters and ore drawing equipment.