| With the development and popularity of the coal mining's mechanical method, the gangue proportion and ash increase sharply. The quality of the coal reduce, which brings about negative effects on environment and equipment. For this reason, it is significant to receve gangue from the coal. Because of lower cost, compact structure, water conservation, high separating accuracy, simple technique, mature technique, the mechanical movable sieve jigger is widely used by the coal-separating plant in our country. It is found that the driving mechanism which is core components of mechanical movable sieve jigger can make a difference for separation.Firstly, Through resouring and field research, the jigging theory and the working principle of the mechanical movable sieve jigger had been learned. The movement of sieve tray is one of the leading factors of separation, which is determined by the driving mechanism. This paper simplified the driving mechanism for six-bar linkage, then analyzed the movement of six-bar linkage by the use of vector analysis with the matlab, which laid the foundation for the optimization design. Considering the equipment stability, the acceleration of sieve tray is as little as possible. However,the large accelaeration is propitious to receve gangue from the coal. When we designed the driving mechanism, the basic condition such as the principle of the bar linkage and transmission angle should be considered as well as the efficiency of separation. The mathematical model of the driving mechanism was created based on all of above.The optimal solution was abtained by the complex method with matlab.Lastly, the optimal solution was analyzed and examined. The new driving mechanism of mechanical movable sieve jigger was modeled with UG NX6.0, and it was motion simulated with dynamic simulation module. The dynamic simulation and kinematics curve were educed, and there was no interference to be found, which proved that the optimal solution was reasonable.
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