What is ultrasonic wave
Wave can be divided into three types, namely infrasonic wave, sound wave and ultrasonic wave. The frequency of infrasound waves is below 20Hz; the frequency of sound waves is 20Hz~20kHz; the frequency of ultrasonic waves is above 20kHz. The infrasound and ultrasonic waves are generally inaudible to human ears. Due to its high frequency and short wavelength, ultrasonic waves have good propagation direction and strong penetration ability. This is why ultrasonic cleaning machines are designed and manufactured.
Principle of ultrasonic cleaning machine:
Ultrasonic cleaning machine uses an ultrasonic generator to amplify the electric power of the oscillating signal with a frequency higher than 20KHz and then passes it through the ultrasonic transducer (vibrator). The inverse piezoelectric effect is converted into high-frequency mechanical vibration energy through acoustic radiation in the cleaning medium, causing the molecules of the cleaning fluid to vibrate and generate countless tiny bubbles. The bubbles form and grow in the negative pressure area along the direction of ultrasonic propagation, and quickly close in the positive pressure area. The instant high pressure of thousands of atmospheres is generated and exploded, forming countless microscopic high-pressure shock waves that act on the surface of the workpiece to be cleaned.
This is the "cavitation effect" in ultrasonic cleaning. Amap's ultrasonic cleaning machine works based on the basic principle of "cavitation effect". Therefore, ultrasonic cleaning is suitable for workpieces with complex internal and external structures, microscopically uneven surfaces, slits, small holes, corners, dead corners, dense components, etc. It has excellent cleaning ability that is unmatched by other cleaning methods. As the ultrasonic frequency increases, the number of bubbles increases and the blasting impact force weakens. Therefore, high-frequency ultrasonic is particularly suitable for cleaning small particles of dirt without damaging the surface of the workpiece.
The composition of an 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. An ultrasonic transducer vibrator is installed at the bottom. The ultrasonic generator generates high frequency and high voltage, which is transmitted to the transducer through the cable connection line. The transducer and the vibration plate are together High-frequency vibration is generated, so that the solvent in the cleaning tank is affected by ultrasonic waves to clean the dirt
There are many factors that affect the effect of the ultrasonic cleaning machine, the main ones are as follows:
< p>Wave power density: The higher the power density, the stronger the cavitation effect, the better the cleaning effect, and the faster the cleaning speed. For workpieces that are difficult to clean, high power density should be used, and for precision workpieces, low power density should be used.Ultrasonic frequency: The lower the frequency, the better the cavitation, the higher the frequency, the better the refraction effect. Low frequency should be used for simple surfaces, and high frequency should be used for complex surfaces and deep blind holes. (20KHz/28KHz/40KHz/80KHz/0.8MHz)
Cleaning temperature: Ultrasonic cavitation is best at 40℃~50℃. The higher the temperature, the more conducive to the decomposition of dirt. However, when the temperature reaches 70°C to 80°C, it will affect the function of ultrasonic waves and reduce the cleaning effect.
Cleaning time: The longer the cleaning time, the better the effect, except for special materials.
Types of cleaning solution (medium): Choose different parameters according to different objects to achieve the best cleaning effect.
The process of the ultrasonic cleaning machine is as follows:
Hot soaking → Ultrasonic rough cleaning → Ultrasonic fine cleaning → Ultrasonic rinsing → Compressed air drying → Hot air drying and other processes.
Users can increase or decrease the above process appropriately according to the cleaning objects.
Dual-frequency: The dual-frequency ultrasonic cleaner breaks through the traditional form of one machine with a single frequency for decades. Through the conversion of two frequencies of 40KHz and 59KHz, the workpiece to be cleaned can be cleaned in two ways: rough cleaning and fine cleaning. Cleaning generates a secondary wave peak power in the cleaning tank, which helps to clean stubborn dirt, or strengthens the cavitation effect of semi-aqueous and hydrocarbon solvents, so that dirt of different properties that may exist on the workpiece to be washed is fully eliminated. Cleaning, at the same time, the 59KHz frequency range of the cleaner not only has a cleaning effect, but also has ideal effects for degassing, defoaming, mixing, and chemical extraction that are unmatched by frequencies below 40KHz.
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