| Belt Shaanxi coal group Ningtiaota Coal Mine annual production capacity of 18 million tons,the production layout for the north and South wings synchronous multilayer coal mining mode.On the one hand,due to the reasons of geological storage,the calorific value of coal in the north and the south sides of the Ningtiaota mine is quite different.The determination of coal price by the lowest calorific amount may bring losses to the coal mine.According to the quality requirements of raw coal for export sale,the continuous automatic proportioning of incoming coal from north and South wings on the main lifting belt conveyor system can meet the requirements for coal quality based on export.On the other hand,due to the influence of the amount of coal to the north and South wings by the production conditions,often in a light load or a main lifting belt conveyor,easy to cause the waste of energy and equipment wear.If the coal quality is guaranteed,according to the output of the two wings,the main hoisting belt conveyor system can achieve energy saving and reduce equipment wear,improve the production efficiency of enterprises,and achieve the purpose of energy saving and emission reduction.It is of great economic significance and reference value to study coal mine automatic blending and main operation control system optimization.This paper analyzes the resistance of belt conveyor during its running,and studies the energy consumption relationship of the belt conveyor.Through the analysis of the theoretical basis for the energy saving operation of belt conveyor,we deduce the expression of the optimal control objective function of the belt conveyor with the maximum filling rate of the belt conveyor when the belt conveyor has a certain load and normal production.In view of the parallel structure of the main transportation system of Ningtiaota coal mine,the relationship between the upper and lower belt conveyor is studied according to the material balance equation and the optimal control objective function.The product of the belt speed and filling transported in a unit time are fixed.When the load is fixed,According to the relationship between coal filling rate and belt speed of the upper belt conveyor.The minimum belt speed can be obtained when the filling rate of the lower belt conveyor is the largest,and the minimum speed of belt conveyor with optimized control system.The energy consumption of the whole belt conveyor system after optimized,is the sum of the total energy consumption of all belt conveyors at the minimum belt speed.In the automatic coal blending optimization control system,the goal of optimal control is to make the main transport belt conveyor capacity match its maximum capatcity,that is,it’s minimum deviation between the actual operating energy of the main belt conveyor and its specified capacity.Finally,the software and hardware of the system are designed.The hardware design includes the design of the control system and the selection of the components in the system.The software design includes the related programs and the design of the upper computer.We use the software and hardware platform of the optimization control system to debug the system.The results show that the automatic control system of coal blending and the optimized control system of main hoisting conveyor belt met the design requirements.. |
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