Ultrasonic cleaning machine has the characteristics of high cleaning cleanliness and fast cleaning speed. Especially for blind holes and various geometric objects, there is a cleaning effect that cannot be achieved by other cleaning methods. So now ultrasonic cleaning machines are very popular. So, what is the principle of ultrasonic cleaning machines? Below is a detailed introduction for everyone.
The principle of ultrasonic cleaning machine is that the high-frequency oscillation signal emitted by the ultrasonic generator is converted into high-frequency mechanical oscillation by the transducer and propagated to the medium - cleaning solvent. The ultrasonic waves radiate forward in the cleaning solution, causing the liquid to flow and generate tens of thousands of tiny bubbles with diameters of 50-500 meters. The tiny bubbles existing in the liquid vibrate under the action of the sound field. These bubbles form and grow in the negative pressure zone where ultrasound propagates longitudinally, while in the positive pressure zone, when the sound pressure reaches a certain value, the bubbles rapidly increase and then suddenly close. And when the bubble closes, a shock wave is generated, generating thousands of atmospheres of pressure around it, destroying insoluble pollutants and dispersing them in the cleaning solution. When the group particles are wrapped in oil and adhere to the surface of the cleaning part, the oil is emulsified, and the solid particles detach, thus achieving the purpose of purifying the cleaning part. In this process known as cavitation effect, the closure of bubbles can form a high temperature and instantaneous high pressure of over 1000 atmospheres. The continuous generation of instantaneous high pressure is like a series of small explosions constantly impacting the surface of the object, causing the dirt on the surface and in the gaps of the object to quickly peel off, thus achieving the purpose of cleaning and purifying the surface of the object.
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 dragged away, can the vacuum core bubble of cavitation achieve the best effect.