Piezoelectric ceramic actuator structure for reducing compressive internal stress

The invention provides a piezoelectric ceramic actuator structure capable of reducing compressive stress, and relates to the field of piezoelectric ceramic actuators. The piezoelectric ceramic actuator structure based on pressure internal stress reduction comprises a metal outer shell and a piezoelectric ceramic body, one end of the upper portion of the metal outer shell is fixedly connected with a locking nut, a moving part is arranged at the center of the locking nut, and the end, close to the piezoelectric ceramic body, of the moving part is fixedly connected with a connecting base; two pre-tightening discs are arranged on the upper portion in the metal outer shell, and the end, away from the locking nut, of the metal outer shell is fixedly connected with a base. According to the invention, the piezoelectric ceramic main body and the actuator fixing piece can be combined by utilizing a non-fixed contact mode between the hemispherical surface of the hemispherical shaft and the conical concave groove, the fo