As is well known, the sound that people hear is a sound wave signal with a frequency of 20-20000Hz. Sound waves above 20000Hz are called ultrasonic waves. The transmission of sound waves follows a sine curve longitudinal propagation, that is, one layer strong and one layer weak, transmitted in sequence. When weak sound wave signals act on the liquid, they will generate a certain negative pressure on the liquid, causing many small bubbles to form inside the liquid. When strong sound wave signals act on the liquid, they will generate a certain positive pressure on the liquid, thus crushing the small bubbles formed in the liquid. Through research, it has been proven that when ultrasound is applied to a liquid, the rupture of each bubble in the liquid produces a highly energetic shock wave, equivalent to instantly producing high temperatures of several hundred degrees and pressures of up to thousands of atmospheres. This phenomenon is called the "cavitation effect", and ultrasonic cleaning uses the shock wave generated by the rupture of bubbles in the liquid to clean and flush the inner and outer surfaces of the workpiece. Ultrasonic cleaning machine uses ultrasonic signals higher than 20KHZ, which are converted into high-frequency mechanical oscillations by a transducer and transmitted into the cleaning solution. Ultrasonic waves radiate forward in a sparse and dense manner in the cleaning solution, causing the liquid to flow and generate tens of thousands of tiny bubbles. These bubbles grow in the negative pressure zone formed by the longitudinal propagation of ultrasonic waves, and quickly close in the positive pressure zone. The formation, growth, and rapid closure of these bubbles are called cavitation phenomenon. In the phenomenon of cavitation, the closure of these bubbles forms an instantaneous high pressure of over 1000 atmospheres, which continuously bombards the surface of the object like a series of small "explosions", causing the dirt on the surface and in the gaps to quickly peel off, achieving a rapid cleaning effect; When the sound pressure or intensity reaches a certain level of pressure, bubbles will rapidly expand and then suddenly close. During this process, a shock wave is generated at the moment when the bubble closes, causing a pressure of 1012-1013pa and local temperature adjustment around the bubble. The enormous pressure generated by ultrasonic cavitation can destroy insoluble pollutants and cause them to differentiate into the solution. Steam type cavitation has a direct reverse impact on the pollutants. On the one hand, it can destroy the adsorption between the dirt and the surface of the cleaning part, and on the other hand, it can cause fatigue damage of the dirt layer and be rejected. The vibration of gas bubbles cleans the solid surface. Once there is a gap in the dirt layer that can be drilled, the bubbles immediately "drill in" and vibrate to make the dirt layer fall off. Due to cavitation, the two liquids quickly disperse and emulsify at the interface. When solid particles are wrapped in oil and adhere to the surface of the cleaning part, the oil is emulsified and the solid particles fall off on their own. When ultrasound propagates in the cleaning liquid, positive and negative alternating sound pressure is generated, forming a jet that impacts the cleaning part. At the same time, due to nonlinear effects, sound flow and micro sound flow are generated. Ultrasonic cavitation produces high-speed micro jet at the interface between solid and liquid. All of these effects can... Destroying dirt, removing or weakening boundary fouling layers, increasing stirring and diffusion effects, Accelerate the dissolution of soluble pollutants and enhance the cleaning effect of chemical cleaning agents. From this, it can be seen that wherever a liquid can penetrate and a sound field exists, there is a cleaning effect, which is suitable for cleaning parts with very complex surface shapes. Especially after adopting this technology, the amount of chemical solvents used can be reduced, greatly reducing environmental pollution. The second ultrasonic wave propagates in the liquid, causing the liquid and the cleaning tank to vibrate together at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequency, which is the frequency of sound waves, so people hear buzzing sounds. In addition, during the ultrasonic cleaning process, the visible bubbles are not vacuum core bubbles, but air bubbles, which suppress cavitation and reduce cleaning efficiency. Only when the air bubbles in the liquid are completely dragged away, can the vacuum core bubble of cavitation achieve the best effect. The above figure is a cross-sectional view of a transducer working in water: in the middle is a layer of stainless steel plate with a certain thickness, and the transducer head is attached to this layer of steel plate. The transducer head and stainless steel plate are driven by an AC signal with a certain frequency and voltage generated by an ultrasonic source to perform high-frequency vibration together. When the steel plate vibrates upwards, the water is pushed upwards. When the steel plate vibrates downwards, the water cannot keep up with the vibration speed of the steel plate, and a gap is formed between the water and the steel plate. This repeated vibration will result in the formation of many bubbles, as shown in the figure: these bubbles are generated by the "cavitation effect", which we call cavitation bubbles. Cavitation bubbles propagate in the direction of vibration towards the water. If there is a workpiece in the water, the cavitation bubbles collide with the surface of the workpiece, generating an impact force of thousands of atmospheres, which drives the dirt on the surface of the workpiece to fall off.