Research On The Longitudinal Torsion Piezoelectric Vibrating Disc And Its Excitation Circuit

Vibrating plate is an auxiliary feeding device used in the field of industrial automation It is the main component to solve the problem of automatic feeding of parts.Vibrating can arrange all kinds of parts in an orderly,and accurately convey them to the next process,and then cooperate with automatic assembly machine to complete the assembly of products.The core component of the vibration plate is the vibration exciter,.which is the power source of the vibration plate.Generally divided into electromagnetic actuator and piezoelectric actuator,electromagnetic actuator is gradually replaced by piezoelectric actuator because of its high noise and energy consumption.Traditional piezoelectric vibration devices are usually linear or disc spiral.Their common characteristics are that they use bi-piezoelectric wafers with spring blades to generate exciting force to drive the feeding plate,which has the characteristics of small volume and light weight for material delivery.In this paper,a sandwich piezoelectric transducer with slotted front cover of circular tube is designed.The transducer generates longitudinal-torsional vibration to drive the plate and complete the feeding task.Using finite element software,the structure of the transducer is designed,and the working parameters of the piezoelectric vibration plate are obtained.According to the working parameters of the piezoelectric vibration plate,the corresponding driving and control circuits are designed.The main work of this paper is as follows:1 The design scheme of the longitudinal-torsional composite vibration piezoelectric vibration plate system is given,including the mechanical structure of the longitudinal-torsional piezoelectric vibration plate and the peripheral driving circuit2 Using finite element simulation software,a three-dimensional finite element model of piezoelectric vibration plate with longitudinal and torsional vibration is established,and the vibration modes of piezoelectric vibration plate are simulated.The simulation results show that the frequency of the transducer’s combined longitudinal and torsional vibration is 198.84Hz,and the transducer’s longitudinal and torsional vibration displacement is larger at the resonance frequency3 According to the working parameters of the piezoelectric vibration plate,the external driving circuit of the transducer is designed.It mainly includes low frequency oscillation circuit and power amplifier circuit.The low-frequency oscillation circuit generates an oscillation signal with a frequency of 198.84Hz.The power amplifier circuit amplifies the oscillation signal and excites the longitudinal-torsional composite vibration piezoelectric transducer,which makes the vibration disc produce low-frequency vibration.The Multisim software is used to simulate the performance of the circuit.4 The driving circuit of the longitudinal-torsional piezoelectric vibration disc is constructed and tested.The experimental results show that the developed driving circuit can drive the piezoelectric vibration plate effectively,and the parameters of each part meet the design requirements.The piezoelectric vibrating plate designed in this paper originates from the high-power longitudinal-torsional composite sandwich piezoelectric circular tube transducer in acoustics.Because of the high power of the transducer,the mass range of the transportable materials becomes wider,and it is suitable for the transportation of larger materials.Moreover,the system has the characteristics of low working frequency,high processing capacity,low power consumption and no electromagnetic radiation.The research results have certain significance for the design of large piezoelectric vibration plate in industry.