The Study On The Linear Ultrasonic Vibration Feeding System Based On The Langevin Transducer

In this paper, with the National Natural Science Foundation"The Drive Theory And Research Methods On The Ultrasonic Vibration For Material Feeding", the linear ultrasonic vibration feeding system (called the ultrasonic vibration feeding system for short), using the Langevin Transducer as the vibration source, is proposed. According to the piezoelectric and ultrasonic driving technology, the relevant theoretical analysis and calculation has been done, and an ultrasonic vibration feeding system has been designed and manufactured. some experiments about the Langevin Transducer and the ultrasonic vibration feeding system are carried on, and some conclusions are obtained.The paper consists of six chapters, given as follows:Chapter 1: IntroductionAs one of the materials transmission equipment which is regularly used in the automatic processing and assembly enterprises, vibration feeder is mainly used in light industry, electronic products industry, and its driving mode is mainly based on electromagnetism and piezoelectricity. But the traditional feeders(electromagnetic and piezoelectric vibration feeder) are limited in certain degree in the clean and low noise occasions. Based on a full study on the development of the structure of the domestic and international multiple forms of vibration feeder, the linear ultrasonic vibration feeding system, using the Langevin Transducer as the vibration source, is proposed in the paper, and its advantages, disadvantages and application prospect are analyzed.Chapter 2: The basic theory of piezoelectricityIn this chapter, the basic concepts of piezoelectric effect is mainly expounded; the type of piezoelectric material, the preparation and polarization of piezoelectric ceramic is introduced; the four kinds of piezoelectric equation is listed; and the six kinds of performance parameters about the piezoelectric ceramic materials is analyzed. Through the introduction on piezoelectric physics foundation, the theory is provided for the design of the Langevin Transducer.Chapter 3: The piezoelectric transducerIn this chapter, advantages, applications and performance indicators of the ultrasonic transducers are expounded. The types of the piezoelectric transducer are introduced. The vibration mode of the ultrasound transducer is analyzed. Based on the above theory, the paper selects the bolts fastening type piezoelectric transducer (also called the Langevin Transducer) as excitation source of the ultrasonic vibration feeding system, which can provide vertical vibration mode. According to the corresponding boundary conditions, the transducer frequency and use requirements, the transducer's vibration equation is established, its structure is designed.Chapter 4: Design of the linear ultrasonic vibration feeding systemIn this chapter, working principle of the ultrasonic vibration feeding system is expounded. The eibration model and the mechanics model of the ultrasonic vibration feeding system are analyzed, the conditions which make materials produce slip movement and jumping movement is established. And based on them, the structure and the components of the ultrasonic vibration feeding system are designed and manufactured.Chapter 5: The experimental test and analysis on the ultrasonic vibration feeding systemIn this chapter, fiestly, the vibration model of the Langevin Transducer is analyzed by ANSYS; resonant frequency and impedance are tested by the Impedance Analyzer; the vertical vibration amplitude is tested by the Laser Rangefinder. Moreover, the system's resonant frequency of the ultrasonic vibration feeding system's prototype is tested by the Impedance Analyzer; through testing the performance of transmission capacity, the impact of drive power, frequency and amplitude on the transmission rate is discussed; the noise of the ultrasonic vibration feeding system's prototype which works in the best condition is tested by the Audio Analyzer, and is compared with it. the work noise of the traditional feeders.Chapter 6: Conclusion and expectationIn this chapter, the conclusion of the paper is given and through the theoretical analysis and experimental studies, the corresponding conclusions is elicited. At the same time, in allusion to the questions found In the experimental study, the optimization design of the prototype structure of the existing ultrasonic vibration feeding system is proposed.