Bk.view.catalog().start("0"); What is ultrasound

According to the frequency wave, it can be divided into three types, namely, infrasound, sound wave, and ultrasonic wave. The frequency of the infrasound wave is below 20 Hz; the frequency of the acoustic wave is 20 Hz to 20 kHz; and the frequency of the ultrasonic wave is above 20 kHz. The secondary sound waves and ultrasonic waves are generally inaudible to the human ear. Due to the high frequency and short wavelength, the ultrasonic wave has good directionality and strong penetrating power, which is why the ultrasonic cleaning machine is designed and manufactured.

The basis of ultrasonic cleaning

(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.

(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.

Principle of ultrasonic cleaning

The high-frequency oscillating signal emitted by the ultrasonic generator is converted into a high-frequency mechanical oscillation by the transducer and propagates into the medium---cleaning solvent, and the ultrasonic wave is radiated forward in the cleaning liquid to make the liquid flow. Tens of thousands of tiny bubbles of 50-500 μm in diameter, and tiny bubbles present in the liquid vibrate under the action of the sound field. These bubbles form and grow in the negative pressure region in which the ultrasonic waves propagate longitudinally, and in the positive pressure region, when the sound pressure reaches a certain value, the bubbles rapidly increase and then suddenly close. And when the bubble is closed, a shock wave is generated, thousands of atmospheric pressures are generated around it, and the insoluble dirt is destroyed to disperse them in the cleaning liquid. When the group particles are wrapped by the oil and adhere to the surface of the cleaning member, the oil is emulsified and solid. Particles and detachment, so as to achieve the purpose of cleaning the cleaning parts. In this process known as the "cavitation" effect, the bubble closure can form a high temperature of several hundred degrees and an instantaneous high pressure of more than 1000 air pressure, continuously generating instantaneous high voltage like a series of small "explosions" constantly impacting objects. The surface causes the surface of the object and the dirt in the gap to peel off rapidly, thereby achieving the purpose of cleaning and purifying the surface of the object.

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.

Ultrasonic cleaning machine

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.