Dynamic Characteristics And Optimum Structure Of Electromagnetic Vibratory Feeder

Electromagnetic vibratory feeders are widely used in automatic production, such as food, machinery, electronic product, pharmaceutical product and so on. As the best of vibratory feeder's various structural parameters, directional mechanism and the size of driving force are determined and affected by the different materials'character, shapes, and surface features and feeding requirements, the matching problem of the multi-performance indexes and multi-influence parameters is still a difficult and key issue in research. Therefore, it is necessary to use the theoretical and calculational methods to establish the dynamic model and the kinematic model, to further study on optimum structural design of electromagnetic vibratory feeder and its dynamic characteristics.In this paper, based on detailedly analyzing present situation of the electromagnetic vibratory feeder at home and abroad, the main problems existing in optimizing structure against the current electromagnetic vibratory feeder was studied. Through the method of theoretical calculation and simulation with the finite element, the bias-type vibratory feeder's deformation of leaf spring and the mode of meeting materials'transportation are systematically studied.After systematically analyzing the working principle of electromagnetic vibratory feeder, the kinematics model and the dynamics model of the disc-shaped and electromagnetic vibratory feeder are established. Relationship between the upper and lower body mass and its relative amplitudes was calculated through studying the theoretical dynamics model. Based on the characteristic curve of amplitude-frequency, the working status of the electromagnetic vibratory feeder was determined and relationship between the natural frequency and the frequency of excitation force was analyzed. Through studying the theoretical kinematics model of the electromagnetic vibratory feeder, the effect of the bias coefficient and the radius of different track on relationship between the angle of vibration and the oblique angle of leaf spring was analyzed, and sliding index and throwing of materials was analyzed. Finally, we received the conclusion: the relationship between the angle of vibration and the forward (reverse) sliding index, and the relationship between the sliding state of part and the kinematics parameter.In the paper, the main point is that the theoretical and equivalent stiffness of the leaf spring was calculated by using the method of energy. The theoretical and vertical stiffness of the leaf spring was simulated by using the finite element method, thus we got the revised formula of the leaf spring's stiffness. Another main point is that the electromagnetic vibratory feeder's the theoretical and natural frequency of the leaf spring with inertial points was calculated. The modal analysis of its structure's the natural frequency was simulated by using the finite element method, thus we got the revised formula of the natural frequency through comparison and revision. Therefore, the designers laid the foundation of calculating the natural frequency of the relative right in the design stage.