1. principle of ultrasonic cleaning machine mainly, the transducer converts the acoustic energy of the power ultrasonic frequency source into mechanical vibration, and then radiates the cleaning liquid in the tank to the ultrasonic waves through the tank wall. Due to the radiation of ultrasonic waves, the microbubbles in the liquid inside the tank can maintain vibration under the action of sound waves. When the sound pressure or sound intensity is subjected to pressure to a certain extent, the bubbles will rapidly expand and then suddenly close. During this process, an shock wave is generated at the moment the bubble closes, creating a pressure of 1012-1013 Pa and local temperature regulation around the bubble. The immense pressure produced by this ultrasonic cavitation can break down insoluble contaminants and dissolve them in the solution. The direct and repeated impact of steam-type cavitation on the contaminants.