The ultrasonic cleaning machine is mainly composed of an ultrasonic cleaning tank and an ultrasonic generator. The ultrasonic cleaning tank is made of high-quality stainless steel with strong elasticity and corrosion resistance. The ultrasonic transducer vibrator is installed at the bottom; the ultrasonic generator generates high-frequency high-voltage, which is transmitted to the transducer through the cable coupling line, and the transducer is combined with the vibration plate. The high frequency resonance is generated, so that the solvent in the cleaning tank is subjected to ultrasonic waves to wash the dirt.
The principle of ultrasonic cleaning is a high-frequency oscillating signal emitted by an ultrasonic generator, which is converted into a high-frequency mechanical oscillation by a transducer and propagated to a medium. The ultrasonic wave in the cleaning solvent is radiated in a dense phase between the cleaning liquid to cause the liquid to flow. Producing tens of thousands of tiny bubbles, the tiny bubbles existing in the liquid vibrate under the action of the sound field. When the sound pressure reaches a certain value, the bubbles rapidly increase, then suddenly close, and a shock wave is generated when the bubble is closed. Thousands of atmospheric pressure are generated, destroying insoluble dirt and dispersing them in the cleaning liquid. When the group particles are wrapped by the oil and adhered to the surface of the cleaning member, the oil is emulsified, the solid particles are separated, and the cleaning member is cleaned. .
Ultrasonic cleaning is the direct and indirect effect of the socialization, acceleration and direct flow of ultrasonic waves on liquids and dirt, so that the dirt layer is dispersed, emulsified and stripped to achieve cleaning purposes. In the ultrasonic cleaning machines currently used, cavitation and direct flow are applied more.
(1) Cavitation: Cavitation is the transmission of ultrasonic waves to a liquid by a high-frequency transformation of compressive force and pressure reduction interaction of more than 20,000 times per second. When the pressure is reduced, a phenomenon of a vacuum core group bubble is generated in the liquid. When the compressive force acts, the vacuum core group bubble generates a strong impact force when crushed by the pressure, thereby peeling off the dirt on the surface of the object to be cleaned, thereby achieving precision. Washing purpose.
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 removed, and the cavitation vacuum nuclear group bubbles can achieve the best results.
(2) Straight inflow: The phenomenon that ultrasonic waves flow in the direction of sound propagation in the liquid is called straight flow. When the sound wave intensity is 0.5 W/cm2, the naked eye can see a straight flow, and a flow is generated perpendicular to the vibration surface at a flow rate of about 10 cm/s. Through this straight flow, the micro-oil dirt on the surface of the object to be cleaned is stirred, and the cleaning liquid on the surface of the dirt is also convected. The dissolved solution of the dissolved dirt is mixed with the new liquid, so that the dissolution rate is accelerated, and the handling of the dirt is very good. Great role.
(3) Acceleration: The acceleration generated by the liquid particles. For the ultrasonic cleaning machine with higher frequency, the cavitation effect is not significant. At this time, the cleaning mainly relies on the acceleration of the liquid particles under the action of ultrasonic to impact the particles to ultra-precision cleaning of the dirt.