The principle of the ultrasonic cleaning machine is mainly to convert the sound energy of the power ultrasonic frequency source into mechanical vibration through the transducer, and to irradiate the ultrasonic wave into the cleaning liquid in the groove through the cleaning tank wall. Due to the radiation of the ultrasonic waves, the microbubbles in the liquid in the tank can be kept vibrated by the action of the sound waves. When the sound pressure or sound intensity is subjected to a certain degree of pressure, the bubble expands rapidly and then suddenly closes. During this process, the shock wave is generated at the moment when the bubble is closed, so that the pressure around the bubble is 1012-1013pa and the local temperature is adjusted. The huge pressure generated by the ultrasonic cavitation can destroy the insoluble dirt and cause them to differentiate into the solution. The direct repeated impact of steam-type cavitation on dirt.

On the one hand, it destroys the adsorption of dirt and the surface of the cleaning member, on the other hand, it can cause the fatigue damage of the dirt layer to be rejected, the vibration of the gas-type bubble scrubs the solid surface, and once the seam is drilled, the bubble immediately “ Drilling into the vibration causes the soil layer to fall off. Due to cavitation, the two liquids are rapidly dispersed and emulsified at the interface. When the solid particles are wrapped by the oil and adhere to the surface of the cleaning member, the oil is emulsified and the solid particles fall off by themselves. When propagating in the cleaning solution, it will produce positive and negative alternating sound pressure, forming a jet, impacting the cleaning member, and at the same time, due to nonlinear effects, sound and micro-acoustic flow will be generated, and ultrasonic cavitation will produce high speed at the solid and liquid interface. Micro-jet, all these effects, can destroy dirt, remove or weaken the boundary layer, increase the stirring and diffusion, accelerate the dissolution of soluble dirt, and strengthen the cleaning effect of chemical cleaning agent. It can be seen that all liquids can be immersed in the place where the sound field exists, and the characteristics are suitable for the cleaning of parts with very complicated surface shapes. In particular, the use of this technology can reduce the amount of chemical solvents, thereby greatly reducing environmental pollution.

The second ultrasonic wave propagates in the liquid, causing the liquid to vibrate together with the cleaning tank at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, it has its own natural frequency, and the vibration frequency is the acoustic wave frequency, so people hear the click sound.

In addition, in the ultrasonic cleaning process, the bubbles visible to the naked eye are not vacuum nuclear group bubbles, but air bubbles, which inhibit the cavitation and reduce the cleaning efficiency. Only the air bubbles in the liquid are completely towed away, and the cavitation vacuum core group bubble can achieve the best effect.

The ultrasonic wave propagating in the liquid can clean the dirt on the surface of the object. The principle can be explained by the phenomenon of "cavitation": when the ultrasonic wave propagates in the liquid to a pressure of one atmosphere, the power density is 0.35w/cm2. At this time, the peak of the ultrasonic wave pressure can reach the vacuum or the negative pressure, but in fact no negative pressure exists, so a large force is generated in the liquid, and the liquid molecules are pulled into a cavity and a cavitation nucleus. This cavity is very close to the vacuum, which ruptures when the ultrasonic pressure is reversed to the maximum, and the strong impact due to the rupture strikes the dirt on the surface of the object. This shock wave phenomenon caused by the cracking of numerous small cavitation bubbles is called the "cavitation" phenomenon.