Optimal Design and Experimental Study of Piezoelectric Vibrator With Multi-Order Bending Mode and Multi-Operating Frequency

In order to realize the accurate quantitative feeding of small block materials, this paper conducts theoretical and experimental research on the ultrasonic material conveying device, uses the ANSYS finite element analysis software to design the structure of the ring conveying vibrator, and conducts numerical analysis on the bending vibration modes and their corresponding natural frequencies of the conveying vibrator in the range of 20 kHz– 50 kHz, The influence of the structural parameters of the vibrator on its natural frequency and vibration mode is discussed in detail, the structural dimensions of the vibrator are determined, and the B11, B15 order bending modes and corresponding natural frequencies of the conveying vibrator are optimized. By redesigning the polarization zoning of the piezoelectric ceramic chips, a multi frequency design scheme with multiple bending modes for the same piezoelectric vibrator is realized. On the basis of theoretical analysis, an experimental prototype of a large ring piezoelectric ultrasonic material conveying device is designed and manufactured, and the bending mode and resonant frequency of the conveying vibrator are experimentally verified. The experimental results show that the actual frequency of the B11, B15 order bending mode of the conveying vibrator has certain deviation from the results of finite element analysis, but the frequency difference between the two resonant frequencies under the same order bending mode is almost zero. Finally, the conveying performance of the conveying device is tested experimentally. The designed conveying vibrator has good conveying capacity under the B11, B15 order bending working modes, and the conveying speed is adjustable within a certain range (140 mm/s-450 mm/s).