Optimization Design Of Transmission Mechanism Of The Mechanical Movable Sieve Jigger

In china, the main methods of the coal preparation industry is jigging, the mechanical movable sieve jigger is widely used in the coal preparation. The country improve the requirements of coal preparation accuracy, in order to reduce waste of mineral resources and implement the policy of integration of coal resources, therefore it has great significance for improving the separation effectiveness of the mechanical movable sieve jigger.The mechanical movable sieve jigger emit the light products and heavy products according to stratification of the density, It has many advantages, such as device structure is simple, separation accuracy is high, process is simple and the costs of investment, operation and maintenance are low. The core component of the mechanical movable sieve jigger is the transmission mechanism, it drives sieve bed up and down reciprocating motion, it determines the law of the motion of the sieve bed. If you want to have a higher separation accuracy of the mechanical movable sieve jigger, the design of the transmission mechanism must be reasonable. It has a significant impact for the transmission performance and the separation effectiveness of the mechanical movable sieve jigger. This paper based on the understanding of the structural and working principle of the mechanical movable sieve jigger, the various factors which can affect the separation effectiveness of jigging are analyzed. The mathematical model of transmission mechanism is built, the motion of transmission mechanism are analyzed by using MATLAB/SimMechanics.The curves of each bar of angular displacement, angular velocity and angular acceleration are acquired, the separation effectiveness of mechanical movable sieve jigger and the motion characteristics of each bar of the transmission mechanism.The transmission mechanism of the mechanical movable sieve jigger is optimized, to improved the separation effectiveness of the mechanical movable sieve jigger and the reliability and stability of the equipment. The mathematical model of multi-objection optimization of the transmission mechanism are built, the quick return characteristics of the transmission mechanism and the uniform velocity are selected as object function and the component size is used as optimization variables, the bound for object function have crank conditions of existence, the bound conditions of the optimization variables, the condition of minimum transmission angle and the amplitude range of the sieve bed. The optimal results are obtained applying the MATLAB optimization toolbox. The after optimized results and the before optimized results are compared, the conclusions show that the separation effectiveness are improved by the optimized the transmission mechanism, the reliability and stability of the equipment also are improved.Final, the3D software UG is selected as the platform, according to idiographic request and range of size, the model of the optimized transmission mechanism is established, the motion interference of the transmission mechanism is checked to verify the correctness of the optimized design, the feasibility of the optimized transmission mechanism is proved.