Abstract：Based on the propagation theory of the plane simple longitudinal wave,the switching reason of the ultrasonic wave type in cylindrical chute horn is analyzed,the mechanism of the longitudinal-torsion vibration is revealed and the relationship between the longitudinal vibration amplitude,the torsion vibration amplitude and the incident angle is established in the different material cylindrical chute horn.Through the vibration test on the opening of three chute vibration rod,it is show that chute vibration rod can produce longitudinal torsion vibration,and the relationship between the longitudinal vibration amplitude,the torsion vibration amplitude and the incident angle,which can provide an important reference for the design of the torsion vibration chute horn.

Keyword：ultrasonic;chute vibration horn;longitudinal-torsion vibration;vibration mechanism;propagation characteristics;