Ultrasonic peening gun shell assembly with built-in gas circuit and ultrasonic peening gun using same

The invention discloses an ultrasonic peening gun shell assembly with a built-in gas circuit and an ultrasonic peening gun using the same, the gas circuit is arranged on the inner surface of the peening gun shell assembly composed of a shell, a front cover and a peening needle sleeve, and an ultrasonic device for driving a stepped peening needle is arranged in the inner space of the assembly composed of the peening needle sleeve, the front cover and the shell. Compressed gas is blown to the thin end of the stepped impact needle through the gas path, and the impact needle is blown to the end face of the amplitude-change pole through the compressed gas, so that the impact needle can automatically and smoothly rebound and be in good contact with the end face of the amplitude-change pole after impacting a workpiece every time, all the impact needles can be in a good impact state, and the service life of the impact needle is prolonged. Interference between the impact gun and a workpiece during transverse movement