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Knowledge of ultrasonic cleaning machine

Ultrasonic knowledge:

The frequency of sound wave is the frequency of vibration of sound source.The so-called vibration frequency is the number of reciprocating motions per second, and the unit is Hertz, or Hertz for short.Wave is the propagation of vibration, that is, the vibration is transmitted according to the original frequency.So the frequency of the wave is the frequency of the vibration of the sound source.Waves can be divided into three types, namely infrasonic waves, acoustic waves and ultrasonic waves.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 ultrasonic waves are generally inaudible to human ears.Ultrasonic wave because of its high frequency, short wavelength, so the propagation of good directivity, strong penetration, which is why the design and production of ultrasonic cleaning machine reasons.

Fundamentals:

Ultrasonic cleaning machine can play the role of cleaning dirt, its process is caused by the following:cavitation, acoustic flow, acoustic radiation pressure and acoustic capillary effect.
In the cleaning process, the surface of unclean matter will produce the phenomenon of surface fouling film destruction, peeling, separation, emulsification and dissolution.Different factors have different effects on the cleaning machine.For those dirt that is not attached tightly, cleaning mainly depends on the vibration force of cavitation bubbles (unexploded cavitation bubbles).At the edge of dirt, the strong vibration and explosion of pulse bubbles destroy the adhesion between dirt film and object surface, and play the role of tearing and peeling.Acoustic radiation pressure and acoustic capillary effect promote the washing liquid to penetrate into the tiny concave surface and micropores of the cleaned object, and the acoustic flow can accelerate the dirt to separate from the surface.If the adhesion between the dirt and the surface is relatively firm, the micro-shock wave produced by the explosion of cavitation bubbles is needed to tear the dirt off the surface.
Ultrasonic cleaning mainly makes use of the" cavitation effect" of liquid-when ultrasonic waves radiate in liquid, liquid molecules are sometimes pulled and sometimes pressed, forming countless tiny cavities, which are called" cavitation bubbles" .When the cavitation bubble breaks instantly, local hydraulic shock wave will be generated (the pressure can be as high as 1000 atmospheres).Under the continuous impact of this pressure, all kinds of dirt adhered to the workpiece surface will be peeled off; At the same time, under the action of ultrasonic wave, the pulsating stirring of cleaning solution is intensified, and the dissolution, dispersion and emulsification are accelerated, thus cleaning the workpiece.

Cleaning benefits:

A) Good cleaning effect, high cleanliness and consistent cleanliness of all workpieces;
B) The cleaning speed is fast and the production efficiency is improved;
C) No manual contact with the cleaning liquid, safe and reliable;
D) Deep holes, fine seams and hidden parts of workpieces can also be cleaned;
E) No damage to the surface of the workpiece;
F) Save solvent, heat energy, work space and labor, etc.

Two main parameters of ultrasound:

Frequency:F ≥ 17.6 kHz Power density ρ=emission power (w)/emission area (cm2) Usually ρ ≥ 0.3W/CM2

Cleaning effect and related parameters
Cleaning medium:

Chemical solvent and water-based cleaning agent
② Power density
③ Ultrasonic frequency
④ Cleaning temperature:40 ℃-60 ℃ is the best working temperature.Low temperature will reduce the chemical activity of solution.While high temperature improves the elasticity of gas in bubbles.

Selection and calculation method of ultrasonic wave:

The usual calculation method is:100W ultrasonic power pushes water within 8kg, and so on.Generally, the rated power of each oscillator is 50W [peak power is generally 100W]), and sufficient cavitation strength can be ensured by calculation.Users only need to determine the size of the washing cylinder according to the size of the workpiece to be cleaned and the productivity (generally, the cleaning time for small workpieces is 3-7 minutes per time, and the cleaning time for coarse miscellaneous workpieces is 10-30 minutes).

Comparison of the efficacy of different frequencies:

According to ultrasonic frequency, it is divided into 25KHZ;; 30KHZ; For the three models of 40kHz, see the following table

There are few cavitation bubbles, but the blasting impact is strong, so the cleaning time is short

18 ~ 25kHz

30kHz

40 ~ 50kHz

There are few cavitation bubbles, but the blasting impact is strong, so the cleaning time is short

Moderate

There are many cavitation bubbles, but the blasting impact is weak, but the permeability is strong and the cleaning time is long

Noisy

ditto

Less noise

Suitable for cleaning thicker or heavier stains

ditto

Suitable for cleaning lighter and finer workpieces


Frequency drift ≤ 2kHz.There is only one frequency signal that resonates with the transducer from the ultrasonic generator, so that it can play the highest efficiency and automatically track, stabilize at this frequency, and avoid the trouble of tuning from time to time.If the generator frequency is forced to change, the output power will be greatly reduced and the characteristics will deteriorate.Therefore, the ultrasonic cleaning machine can only select one of the three frequencies according to the needs.

Ultrasonic cleaning machine:Ultrasonic cleaning machine is mainly composed of ultrasonic cleaning tank and ultrasonic generator.Ultrasonic cleaning tank is made of high-quality stainless steel with strong elasticity and corrosion resistance, and ultrasonic transducer vibrator is installed at the bottom; Ultrasonic wave generator produces high frequency and high voltage, which is transmitted to transducer through cable connecting line.Transducer and vibration plate produce high frequency resonance together, so that solvent in cleaning tank can be washed by ultrasonic wave

cleaning characteristics
From the cleaning principle of ultrasonic cleaning machine, we can easily understand why its cleaning efficiency and effect are exceptionally excellent.
No matter how complex the shape of the workpiece is, put it into the cleaning liquid, as long as it can touch the liquid, the ultrasonic cleaning effect can be achieved;
When cleaning, the bubbles generated in the liquid are very uniform, and the cleaning effect of the workpiece will be very uniform;
With the use of cleaning agent, accelerate the separation and dissolution of pollutants, which can effectively prevent the corrosion of cleaning solution to workpieces;
No manual cleaning is needed, which eliminates the damage caused by manual cleaning to workpieces and avoids heavy and dirty manual labor.
Cleaning efficiency:
Since the ultrasonic cleaning technology came out, its outstanding cleaning efficiency has won the favor of the vast number of industry users, especially for its remarkable improvement of cleaning efficiency and cleaning effect, which makes people fall in love at first sight.In the past, complex mechanical parts that needed to be cleaned manually for a long time through heavy manual labor in dirty environment, after the application of ultrasonic cleaning machine, not only the working environment was improved and the labor intensity was reduced, but also the cleaning time was shortened to a quarter of the original on the basis of greatly improving the cleaning accuracy.Compared with all current cleaning methods, ultrasonic cleaning has the highest efficiency.
3.Cleaning cost:
In all cleaning methods, cleaning costs can be roughly divided into:equipment costs and consumption costs.The service life of ultrasonic cleaning equipment is about ten years, Except that the purchase cost of equipment is higher than that of manual cleaning and organic alkaline solvent scrubbing, Lower than gas phase cleaning and high pressure water jet cleaning, For consumption cost, With an effective size of 600 × 400 × 350 mm, The power is 1KW, For example, an ultrasonic cleaning machine with a price of about 10,000 yuan, Work for an hour, Power consumption is 1 degree, The cost is about 0.5 yuan.Alkaline metal cleaning agent 1 kg, The price is about 20 yuan.It can be used repeatedly for 20-50 hours (depending on the pollution level), Equivalent to 0.4-1 yuan/hour, However, the cleaning time of general workpieces is only 3-15 minutes, and a certain number and volume of workpieces can be cleaned at the same time by one cleaning.Therefore, as far as the consumption cost is concerned, ultrasonic cleaning not only has the best cleaning effect, but also the cleaning cost is equivalent to less than 0.04 yuan/piece, which is not the labor cost saved, far lower than other cleaning methods.
Cleaning effect:
As far as cleaning methods are concerned, The cleaning method used in industrial cleaning is generally manual cleaning, Organic solvent cleaning, Steam gas phase cleaning, High pressure water jet cleaning and ultrasonic cleaning, According to the cleaning effect, the cleaning methods can be clearly distinguished, Ultrasonic cleaning is internationally recognized as the most efficient at present, The best cleaning method, The cleaning efficiency reaches over 98%, The cleaning cleanliness has also reached the highest level, However, the cleaning efficiency of traditional manual cleaning and organic solvent cleaning is only 60%-70%, Even the cleaning efficiency of meteorological cleaning and high pressure water jet cleaning is lower than 90%, Therefore, in industrial cleaning, ultrasonic cleaning machine is undoubtedly the best choice for cleaning because of its high efficiency, good effect and suitability for heavy workload cleaning, which is why all industries with high requirements for cleanliness, such as aviation instruments, vacuum coating, optical equipment, medical equipment and other industries choose ultrasonic cleaning.
What is the frequency of ultrasonic waves commonly used?What is the difference in application?
25KHZ 28KHZ 33KHZ 40KHZ 60KHZ
Relatively speaking, the higher the frequency, the greater the density acting on the cleaned objects, the higher the cleanliness, but the weaker the strength.Most of them are used to clean optical glass and other products with high cleanliness; On the contrary, the frequency is lower, and it is mostly used for cleaning ordinary workpieces, such as wax removal and oil removal cleaning of hardware.
How long is the service life of ultrasonic vibrator?
Under normal use, the service life of imported seismo (our company adopts chip seismo imported from America) is about 8 years.By normal use we mean:
1.Dry shock is strictly prohibited.That is, ultrasonic work is started without liquid;
2.It is strictly forbidden to step on or hit the adhesive surface of the ultrasonic vibrator to avoid the vibrator falling off;
3.The working environment of the ultrasonic generator should be well ventilated and cleaned and maintained regularly;
4.Do not replace or adjust the primordial gas parts in the ultrasonic generator at will
Application field
Among all the cleaning methods at present, ultrasonic cleaning is the one with the highest efficiency and the best effect.The reason why ultrasonic cleaning can achieve such an effect is closely related to its unique working principle and cleaning method.We know, In production and life, There are many things that need to be kept clean, and there are many kinds and links that need to be cleaned.Common manual cleaning methods undoubtedly cannot meet the requirements, and even steam cleaning and high-pressure water jet cleaning cannot meet the demand for higher cleanliness.Therefore, this is why ultrasonic cleaning is increasingly widely used in all walks of life.
1.Machinery industry:removal of antirust grease; Measuring tool edge
Cleaning of tools; Oil and rust removal of mechanical parts; Cleaning of engine, carburetor and automobile parts, dredging and cleaning of filter and filter screen, etc.
2.Surface treatment industry:oil and rust removal before electroplating; Cleaning before ion plating; Phosphating treatment; Remove carbon deposits, scale, polishing paste, metal workpiece surface activation treatment, etc.
3.Medical industry:cleaning, disinfection and sterilization of medical devices, cleaning of experimental vessels, etc.
4.Instrument industry:high cleanliness cleaning of precision parts, cleaning before assembly, etc.
5.Electromechanical and electronic industry:removing rosin and solder spots from printed circuit boards; Cleaning of mechanical and electronic parts such as high-voltage contacts and terminals, etc.
6.Optical industry:degreasing, sweating and dust removal of optical devices.
7.Semiconductor industry:High cleanliness cleaning of semiconductor wafers.
8.Science and education culture:cleaning and descaling of experimental utensils such as chemistry and biology.
9.Watch jewelry:Remove oil sludge, dust, oxide layer, polishing paste, etc.
10.Petrochemical industry:cleaning and dredging of metal filter screen; Cleaning of chemical containers and exchangers, etc.
11.Textile printing and dyeing industry:cleaning textile spindles, spinnerets, etc.
12.Others:Ultrasonic cleaning:Remove pollutants and dredge small holes, such as cleaning seals, repairing antiques, dredging automobile electric nozzles, etc.
Ultrasonic stirring:Accelerate dissolution, improve uniformity, accelerate physical and chemical reactions, prevent over-corrosion, accelerate oil-water emulsification,
Such as solvent dye mixing, ultrasonic phosphating, etc.
Ultrasonic coagulation:Accelerate precipitation and separation, such as seed flotation and beverage deslagging.
Ultrasonic sterilization:killing bacteria and organic pollutants, such as sewage treatment and degassing.
Ultrasonic crushing:Reduce solute granularity, such as cell crushing, chemical detection, etc.
Ultrasonic sealing:Eliminate gap gas and improve overall density, such as impregnating paint on workpiece
How to choose ultrasonic cleaning machine.
According to the experience of ultrasonic cleaning, different workpieces, different manufacturing processes and materials of the same workpiece have different cleanliness requirements, different geometric shapes of workpieces and different selection of cleaning agents, which have great influence on the cleaning process, thus the structure of cleaning equipment is also different.Some even need to be determined by experiments.Choosing a reasonable cleaning process route can achieve good results and reduce the manufacturing cost of equipment.


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