Application principle of ultrasonic cleaning
The application principle of ultrasonic cleaning is the high-frequency oscillation signal emitted by the ultrasonic generator, which is converted into high-frequency mechanical oscillation by the transducer and propagated to the medium. The ultrasonic wave in the cleaning solvent is densely radiated in the cleaning liquid to make the liquid Flowing and generating tens of thousands of tiny bubbles, tiny bubbles (cavitational nuclei) present in the liquid vibrate under the action of the sound field. When the sound pressure reaches a certain value, the bubbles grow rapidly and then suddenly close, when the bubbles are closed. Produces a shock wave, generates thousands of atmospheric pressures around it, and has a high temperature of several hundred degrees. The explosion shock wave at the time of closure destroys the insoluble dirt and disperses them in the cleaning liquid. When the group particles are wrapped by the oil, they adhere to the cleaning part. On the surface, the oil is emulsified, and the solid particles are detached, thereby achieving the purpose of purifying the surface of the cleaning member. Due to the inherent penetrating power of the ultrasonic wave, it is possible to clean various complex and shape-specific objects, which have a good cleaning effect on small holes and slits, and the best cleaning effect on objects that do not absorb sound or have a small sound absorption coefficient.
Proper use of ultrasound equipment
1, understand the ultrasound
Ultrasound can be divided into three types, namely, infrasound, sound waves, and ultrasonic waves. 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.
2. How does the ultrasonic work complete the cleaning work?
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.
(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.
3. What is the principle of the ultrasonic cleaning machine?
The ultrasonic transducer converts the high-frequency oscillating electrical signal into a high-frequency mechanical oscillation, which is radiated in the cleaning liquid in the form of a longitudinal wave. During the half-wave expansion of the radiation wave, the compactness of the cleaning liquid is destroyed and numerous bubbles of 50-500 μm in diameter are formed. This bubble is filled with solution vapor. During the compressed half-wave, the bubble speed is closed, resulting in a local hydraulic impact of hundreds of MPa. This phenomenon is called the "cavitation" effect. Under the continuous action of the "cavitation" effect, the dirt on the surface or concealed part of the workpiece is cracked and peeled off. At the same time, under the action of ultrasound, the osmosis of the cleaning solution is strengthened; the pulsation stirring is intensified; the dissolution, dispersion and emulsification are accelerated; thus the workpiece is thoroughly cleaned.
4. Which parts of the ultrasonic cleaning machine are made up of
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.
5. What are the characteristics of the ultrasonic cleaning machine?
Ultrasonic cleaning has the following unique advantages over various chemical, physical, electrochemical, and physical cleaning methods:
· Quickly and thoroughly remove all kinds of dirt on the surface of the workpiece.
·It can clean precision parts with complex shapes such as cavities and grooves.
· Loss to the surface of the workpiece.
· A variety of cleaning agents can be used.
• Wash at room temperature or by appropriate heating (about 60 ° C).
· The integrated structure of the whole machine is easy to move.
· Save solvent, cleaning paper, energy, work space and labor.
6, how to use ultrasonic cleaning machine
The use of ultrasonic cleaners should be carried out in strict accordance with the following requirements.
(1) connecting the cable between the cleaning tank and the generator;
(2) Pour the cleaning solution into the cleaning tank (the amount of the cleaning liquid poured into the object to be cleaned is preferably about three-quarters of the whole liquid level);
Ultrasonic cleaning application principle and correct use of ultrasonic equipment
2008/7/9/08:20 Source: HC Network Auto Maintenance Industry Channel
(3) placing the object to be cleaned into the washing tank;
(4) Plug in the power plug;
(5) Set up cleaning time and start up.
7, what should be paid attention to when using ultrasonic cleaning machine
(1) The ultrasonic cleaner power supply and the electric heater power supply must have good grounding devices.
(2) The ultrasonic cleaning machine is strictly prohibited to start without cleaning liquid, that is, the cleaning cylinder does not add a certain amount of cleaning liquid, and the ultrasonic switch must not be combined.
(3) The cleaning equipment with heating equipment is strictly prohibited to open the heating switch when there is no liquid.
(4) It is forbidden to hit the bottom of the cleaning cylinder with heavy objects (iron pieces) to avoid damage to the energy converter chip.
(5) The ultrasonic generator power supply should be used separately with a 220V/50Hz power supply and equipped with a regulator of 2000W or more.
(6) The bottom of the cleaning cylinder should be flushed regularly, and there should be no excessive impurities or dirt.
(7) Each time the new liquid is changed, the parts can be washed after the ultrasonic is started.
8, the best way to make ultrasonic cleaning
(1) The temperature of the ultrasonic cleaning tank is preferably 30 to 50 °C.
(2) Select the cleaning agent correctly according to different cleaning objects. Cleaning agents are generally classified into water-based (alkaline) cleaning agents, organic solvent cleaning agents, and chemical reaction cleaning agents. The most commonly used water-based cleaners.
(3) Different cleaning time is selected according to the degree of contamination of the object to be cleaned and the nature of the dirt.
9, tips for saving cleaning fluid
The cleaning solution of the ultrasonic cleaning machine can be recycled. This cleaning method can save a lot of cleaning liquid. After each use of the cleaning machine, it is best to put the cleaning liquid into the container, and then pour it into the cleaning tank the next time, the rest. The precipitate can be disposed of. If the concentration of the cleaning solution is not enough, add a proper amount and repeat it.
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