The Dynamics Analysis And Optimization Design Of The Asphalt Mixing Plant Shaker

As one of the key equipments in the highway construction, the shaker has attracted widespread attention, and its production capacity, screening efficiency and lifetime level have an important influence on the highway construction. After the actual investigation and test, we can find that shakers often have the low screening efficiency, short life and other issues which are caused by the irrational structure. In this paper, we studied the 4000 type of asphalt mixing plant shaker, established the detailed kinetic model, carried out the dynamic analysis and finite element simulation of the shaker, and optimized the structure. The specific jobs are listed below:Firstly, the three-dimensional solid model of the shaker was established with the help of the cooperated manufacturers. The structure of the shaker was analyzed combined with the solid model. The multi-DOF dynamic model of the shaker was established by using the Newton’s method, the NEWMARK method was been programmed to solve the dynamic model, so the displacements and movements of the screen sieve and exciters were obtained. On this basis, the relationships between the amplitude of the screen sieve and the support spring stiffness, exciter frequency, screen surface inclination angle and the direction angle of vibration were explored, thus providing a reference for the design of the shaker.Secondly, the modal analysis of the shaker was done, then the natural frequencies and mode shapes formation of the screen sieve were obtained. It could be observed that the operating frequency kept away from the natural frequencies, the resonance would not occur in working. By the transient kinetic analysis of the finite element model, the equivalent contours stress of the screen sieve was obtained. It showed that the structural strength requirements were satisfied. From the stress- time curve in y direction of one node, we could learn that when the shaker was under the action of the harmonic force, the stress of node was simply harmonic changes with time.Lastly, a multi-objective optimization model was proposed. By using the sequential quadratic programming method, the optimal values for achieving the lightest quality, the highest production in per power and the maximum vibration intensity were obtained. The optimize results were checked by the finite element software, it showed that the shaker would not resonate and its structure could meet the strength requirements.This paper links the theoretical analysis to the simulation analysis, the force and movement of the various components of the shaker were analyzed in detailed, and a relevant institutions optimization for the asphalt mixing plant shaker was put forward, it has a certain reference value to the design and use of the vibrating screen.