If you want to use ultrasonic cleaning machine correctly, you must first understand ultrasonic
Waves can be divided into three types, namely infrasound wave, sound wave and ultrasonic wave. The frequency of infrasound wave is below 20Hz; The frequency of sound wave is 20hz~20khz; The frequency of ultrasonic wave is above 20kHz. Among them, infrasound waves and sound waves are generally inaudible to human ears. Because of its high frequency and short wavelength. Ultrasonic wave has good directionality and strong penetration ability, which is why the ultrasonic cleaning machine is designed and manufactured.
Second, we need to know how the ultrasonic cleaning machine completes the cleaning work:
Ultrasonic cleaning refers to the direct and indirect effects of the formation of ultrasonic wave in the liquid, instantaneous explosion, acceleration and direct inflow on the liquid and dirt, so that the dirt layer is dispersed, emulsified and stripped to achieve the purpose of cleaning. At present, cavitation and direct flow are more widely used in ultrasonic cleaning machines.
cavitation is the transmission of ultrasonic wave to liquid in the form of high-frequency transformation with the interaction of compressive force and pressure reduction more than 20000 times per second. During the pressure reduction, the phenomenon of vacuum nuclear bubbles is produced in the liquid. During the compression force, the vacuum nuclear bubbles will produce a strong impact when crushed by pressure. So as to peel off the dirt on the surface of the cleaned object, so as to achieve the purpose of precise cleaning.
(2) Direct inflow:
the phenomenon of ultrasonic wave flowing along the direction of sound propagation in liquid is called direct inflow. When the sound wave intensity is 0.5w/cm2. The naked eye can see the direct inflow, which is perpendicular to the vibrating surface, and the flow rate is about 10cm / s. Through this direct inflow, the micro oil dirt on the surface of the cleaned object is stirred. And the cleaning liquid on the dirt surface also generates convection. The solution of dissolved dirt is mixed with the new liquid, which accelerates the dissolution speed and plays a great role in the handling of dirt.
the acceleration generated by the propulsion of liquid particles. For the ultrasonic cleaning machine with high frequency, the cavitation effect is not significant. At this time, the cleaning mainly relies on the acceleration of liquid particles under the ultrasonic action to impact the particles for ultra precision cleaning of dirt.
Third, understand the principle of ultrasonic cleaning machine:
Ultrasonic transducers convert high-frequency oscillatory electrical signals into high-frequency mechanical oscillations, which radiate in the form of longitudinal waves in the cleaning solution. During the half wave of radiation wave expansion. The compactness of the cleaning fluid is destroyed and countless 50-500 diameters are formed μ M bubble. This bubble is filled with solution vapor. During the half wave of compression, the bubble velocity closes, and a local hydraulic impact of hundreds of MPA will occur. This phenomenon is called “cavitation” effect. Under the continuous action of “cavitation” effect, the dirt on the surface of the workpiece or in the hidden place is cracked and peeled off. At the same time, under the action of ultrasound, the penetration of cleaning fluid is strengthened; Pulsating agitation intensifies; Accelerated dissolution, dispersion and emulsification; So as to thoroughly clean the work piece.
Fourth, be familiar with the parts of the ultrasonic cleaning machine:
Ultra wave cleaning machine is mainly composed of ultrasonic cleaning tank and ultrasonic generator. The ultrasonic cleaning tank is made of high-quality stainless steel with strong elasticity and corrosion resistance, and the bottom is equipped with ultrasonic transducer vibrator; The ultrasonic generator generates high-frequency and high-voltage, which is transmitted to the transducer through the cable connecting line. The transducer and the vibrating plate generate high-frequency resonance together, so that the solvent in the cleaning tank can be cleaned by ultrasound.