Abstract
A piezoelectric vibration feeder with a magnetic spring is discussed in this paper. The feeder can keep resonance frequency relatively stable under changing loading. Through the analysis on the working principle and magnetic spring stiffness characteristic of this feeder, the dynamic model was established and the relationship among system resonance frequency, loading and magnetic spring stiffness was obtained. The analysis showed that, as the loading changed, the magnetic spring stiffness changed accordingly, which maintained a trend of stability in the system resonance frequency. A prototype was made for the experiment, and the relationship among the loading, magnetic spring axial clearance and system resonance frequency was obtained. The result showed that, when the loading changes, the resonance frequency and feeding speed tended to be stable, which matched the theoretical analysis. Through comparison with a traditional vibration feeder, within nominal loading, this new feeder has more stable resonance frequency and feeding speed.
Highlights
Because of good patterning, guiding performance, and high efficiency, a vibrating feeder is widely used in automatic assembly, processing and inspection, etc. [1]
Finite Element Analysis (FEA) and experiment analysis were done on the feeder [8]
The structure of the magnetic spring piezoelectric vibration feeder is shown in Figure 1 below
Summary
Because of good patterning, guiding performance, and high efficiency, a vibrating feeder is widely used in automatic assembly, processing and inspection, etc. [1]. In China, some universities are working on piezoelectric vibrating feeder research [10,11,12,13,14,15,16,17,18], such as Tianjin University, Dalian Science and Technology University, Nanjing. Feeders are usually working at resonance conditions. The feeder spring stiffness can change and the resonance frequency can function as well. With the same structure and size, the annular magnetic spring has good mechanical properties and wide changing range [19,20], which can simplify the system, reduce the noise level, and can eliminate fatigue deformation. Based on adjustable stiffness of the magnetic spring, a novel piezoelectric resonance feeder is proposed. With theoretical analysis and experiment, the material mass, magnetic spring stiffness and system resonance frequency changes were analyzed initially, and the possibility to stabilize the system resonance frequency with the magnetic spring was validated
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