1, definition
What is ultrasonic: waves can be divided into three kinds, namely infrasound, sound waves, ultrasound. The frequency of infrasound is below 20Hz; the frequency of sound wave is 20Hz~20kHz; the frequency of ultrasonic wave is above 20kHz. The infrasound and ultrasound waves are generally inaudible to the human ear. Ultrasonic waves due to the high frequency, short wavelength, and therefore the propagation of the direction of good, penetrating ability, which is why the design and production of ultrasonic cleaning machine.
2, ultrasonic how to complete the cleaning work
Ultrasonic cleaning is the use of ultrasound in the liquid cavitation, acceleration and direct flow into the role of the liquid and dirt directly, indirectly, so that the dirt layer is dispersed, emulsification, stripping to achieve the purpose of cleaning. Currently used in the ultrasonic cleaning machine, cavitation and direct flow into the role of more applications.
(1) Cavitation: Cavitation is the role of ultrasonic compression and decompression of more than 20,000 times per second interactive high-frequency transformations to the liquid for transmittance. In the decompression effect, the liquid produces a vacuum core group bubble phenomenon, in the compression effect, the vacuum core group bubble pressure crushed to produce a strong impact, thus stripping the dirt on the surface of the cleaning material, so as to achieve the purpose of precision cleaning.
In the ultrasonic cleaning process, the naked eye can see the bubble is not the vacuum nucleus group bubble, but the air bubble, which inhibits the cavitation effect to reduce the cleaning efficiency. Only the air bubbles in the liquid is completely removed, the cavitation effect of the vacuum core group bubble to achieve the best results.
(2) straight into the role of the flow: ultrasound in the liquid along the direction of sound propagation to produce the phenomenon of flow is called straight into the flow. Acoustic intensity of 0.5W/cm2, the naked eye can see straight into the flow, perpendicular to the vibration surface to produce flow, the flow rate of about 10cm/s. Through this straight into the flow of micro-oil dirt on the surface of the cleaned object is stirred, the cleaning fluid on the surface of the dirt also produces convection to dissolve the dissolved solution of the dirt and the new liquid mix, so that the dissolution speed to accelerate the handling of dirt plays a great role.
(3) acceleration: the acceleration generated by the liquid particles to promote. For higher frequency ultrasonic cleaning machine, cavitation is not significant, when the cleaning mainly rely on the liquid particles ultrasonic acceleration impact particles on the dirt ultra-precision cleaning.
3, the composition of ultrasonic cleaning machine
Ultrasonic cleaning machine is mainly composed of ultrasonic cleaning tank and ultrasonic generator two parts. Ultrasonic cleaning tank with strong elasticity, corrosion-resistant high-quality stainless steel made of ultrasonic transducer installed at the bottom of the vibrator; ultrasonic generator produces high-frequency high-pressure, through the cable linkage line to the transducer, transducer and vibration plate with the production of high-frequency **** vibration, so that the solvent in the cleaning tank by the ultrasonic action of the dirt to wash.
Ultrasonic cleaning machine (English note Ultrasonic Cleaning Machine) applications
1, Overview:
A certain frequency range of sound waves in the liquid medium can play a role in cleaning the role of the workpiece, this cleaning technology since its inception, by the general concern of all walks of life. The use of ultrasonic cleaning has greatly improved the efficiency and cleaning effect, in the past, cleaning dead ends, blind holes and hard to reach the hidden dirt has been making people feel bewildered, ultrasonic cleaning development and use of this work has become a breeze. In recent years, with the rapid changes in electronic technology, ultrasonic cleaning is also inseparable from our daily work, ultrasonic cleaning machine after several generations of evolution, technology is more advanced, the effect is more significant, the same, its price is more and more socially acceptable, in all walks of life is gradually being widely used.
Ultrasound is 46,000 vibrations per second in the liquid conduction, because ultrasound is a compression of longitudinal waves, in the use of propulsion medium will make the pressure change in the liquid and produce countless tiny vacuum bubbles, resulting in the cavity effect, when the bubbles are burst under pressure, it will produce a strong impact, at the same time, there is ultrasound emulsification and neutralization of ultrasonic waves can be more effective in preventing the cleaning of the oil and dirt reattachment in the object to be cleaned. The cleaning object.
2, the scope of application:
In all the cleaning methods, ultrasonic cleaning is the most efficient, the best results of a kind, the reason why ultrasonic cleaning to achieve such an effect, is closely related to its unique principle of operation and cleaning methods. We know that in production and life, the need to clean a lot of things, the need to clean the types and links are also many, such as: the removal of pollutants from the object, dredge the tiny holes, common manual cleaning methods for shaped objects and objects hidden places undoubtedly can not meet the requirements, even if it is a steam cleaner and high-pressure water jet cleaning can not meet the demand for a higher degree of cleanliness, ultrasonic cleaning of the object can also be achieved to kill bacteria, dissolve organic pollutants, preventing and cleaning the object. Bacteria, dissolve organic pollutants, prevent corrosion, etc., therefore, ultrasonic cleaning is increasingly widely used in all walks of life:
(1) machinery industry: the removal of rust and grease; gauge cleaning; mechanical parts of the de-oil rust; engine, carburetor and automotive parts cleaning; filters, filters, such as dredging cleaning.
(2) Surface treatment industry: oil and rust removal before plating; cleaning before ion plating; phosphating treatment; removal of carbon deposits; removal of oxidized skin; removal of polishing paste; surface activation treatment of metal workpieces and so on.
(3) Instrumentation industry: high cleanliness of precision parts before assembly cleaning, etc..
(4) electronics industry: printed circuit boards in addition to rosin, welding spot; high-pressure contacts and other mechanical and electronic parts of the cleaning.
(5) medical industry: medical equipment cleaning, disinfection, sterilization, cleaning of laboratory equipment.
(6) Semiconductor industry: semiconductor wafer cleaning of high cleanliness.
(7) Watch head, jewelry industry: remove sludge, dust, oxidation layer, polishing paste, etc..
(8) chemical and biological industries: cleaning and descaling of experimental vessels.
(9) Optical industry: oil removal of optical devices, de-sweat, ash, etc..
(10) textile printing and dyeing industry: cleaning textile spindles, spinnerets and so on.
(11) petrochemical industry: metal filter cleaning and dredging, chemical containers, exchanger cleaning.
3, the advantages of ultrasonic cleaning:
Compared with a variety of other cleaning methods, ultrasonic cleaning machine shows great superiority. Especially in the specialized, group production enterprises, has gradually used ultrasonic cleaning machine to replace the traditional immersion, brushing, pressure washing, vibration cleaning and steam cleaning and other process methods. Ultrasonic cleaning machine of high efficiency and high cleanliness, thanks to its sound wave propagation in the medium when the penetration and cavitation shock wave. So it is easy to with complex shape, cavity and fine empty parts clean, on the general degreasing, rust, phosphating and other processes, under the action of ultrasonic waves can be completed in just two or three minutes, its speed than the traditional method can be increased by several times to dozens of times, the cleanliness can also reach a high standard, which is in many of the surface quality of the product and the productivity requirements of the higher occasions, more prominently displayed with other processing methods The results are difficult to achieve or irreplaceable.
The advantages are summarized as follows:
(1) fast cleaning speed, good cleaning effect, high cleanliness, consistent cleanliness of the workpiece, no damage to the surface of the workpiece.
(2) No manual contact with the cleaning fluid, safe and reliable for deep holes, seams and hidden parts of the workpiece is also clean.
(3) Save solvent, heat, workplace and labor.
(4) High cleaning precision, can be powerful cleaning of small stain particles.
4. Precautions:
(1) The power supply of the ultrasonic cleaning machine and the power supply of the heater must have a good grounding device.
(2) ultrasonic cleaning machine is strictly prohibited without cleaning fluid boot, that is, the cleaning cylinder does not add a certain amount of cleaning fluid, shall not close the ultrasonic switch.
(3) Heating equipment cleaning equipment is strictly prohibited without liquid open the heating switch.
(4) Prohibit the use of heavy objects (iron) to hit the bottom of the cleaning cylinder, so as to avoid damage to the energy converter chip.
(5) The ultrasonic generator power supply should be used separately all the way 220V/50Hz power supply and equipped with 2000W or more voltage regulator.
(6) The bottom of the cleaning cylinder should be rinsed regularly, without excessive debris or dirt.
(7) Each time a new liquid, to be ultrasonic start before washing.
4, ultrasonic cleaning should pay attention to a number of issues
First, the choice of power
Ultrasonic cleaning effect is not necessarily proportional to the (power × cleaning time), and sometimes with a small power, spend a long time did not remove the dirt. If the power to reach a certain value, sometimes very quickly remove the dirt. If the choice of power is too large, cavitation intensity will increase greatly, the cleaning effect is improved, but then the more precise parts also produce etching points, the loss is not worth it, and the bottom of the cleaning cylinder vibration plate at the cavitation is serious, the water point corrosion also increased in the use of trichloroethylene and other organic solvents, basically no problem, but the use of water or water-soluble cleaning fluid, easy to be corroded by the water point, if the vibration plate surface has been scarred, strong Power underwater cavitation corrosion is more serious, so the actual use of ultrasonic power selection.
Second, the choice of frequency
Ultrasonic cleaning frequency from a dozen kHz to 100kHz, in the use of water or water cleaning agent by the physical cleaning force caused by the role of cavitation is obviously favorable to the low-frequency, generally use 15-30kHz or so. For small gaps, slits, deep holes in the parts cleaning, with high frequency (generally more than 40kHz) is better, or even hundreds of kHz. the clock parts cleaning, with 400kHz. if you use a broadband FM cleaning, the effect is even better.
Third, the use of cleaning cage
In the cleaning of small parts items, often use the cage, due to the mesh to cause ultrasonic attenuation, to pay special attention. When the frequency of 28khz when using more than 10mm mesh is good.
Fourth, the choice of cleaning fluid temperature
The most suitable cleaning fluid water cleaning temperature of 40-60 ℃, especially in the cold if the cleaning fluid temperature is low cavitation effect is poor, the cleaning effect is also poor. Therefore, some of the cleaning machine in the cleaning cylinder around the outside of the heating wire for temperature control, when the temperature rises after cavitation is easy to occur, so the cleaning effect is better. When the temperature continues to rise later, the gas pressure within the air bubble increases, causing the impact of sound pressure drops, reacting to the multiplying effect of these two factors.
Fifth, on the amount of cleaning fluid and cleaning parts of the location of the determination
General cleaning fluid level above the surface of the vibrator more than 100mm for the best. For example, 300W, 24kHz liquid surface is about 120mm high; 600W, 24kHz liquid surface is about 150mm high. due to the single-frequency cleaning machine by the influence of the standing wave field, the amplitude of the wave section at the amplitude is very small, wave amplitude at the amplitude of the large cause of uneven cleaning. Therefore, the best choice of cleaning items should be placed in the location of the amplitude.
Six, the other
Cleaning a large number of dirt parts are generally used to dip, spray and other methods of pre-cleaning. After removing most of the dirt, and then ultrasonic cleaning of the remaining dirt, then the effect is good. If the cleaning of small items and complex shape of the items (parts), if the use of cleaning net or make the cleaning of rotating, vibration side of the ultrasonic radiation, can get uniform cleaning.
VII, ultrasonic cleaning machine cleaning technology features
Good cleaning effect, high cleanliness and all the workpiece cleanliness is consistent. Cleaning speed, improve productivity, do not have to manually touch the cleaning fluid, safe and reliable. Deep holes, slits and hidden parts of the workpiece can also be cleaned. No damage to the surface of the workpiece, saving solvent, heat, workplace and labor.
The ultrasonic cleaning method exceeds the general to the conventional cleaning methods, especially the surface of the workpiece is more complex, such as some of the uneven surface, there are blind holes in the mechanical parts, some especially small and high requirements for cleanliness of products such as: watches and precision machinery parts, electronic components, circuit board components, etc., the use of ultrasonic cleaning can achieve very satisfactory results.
The role of ultrasonic cleaning mechanism mainly has the following aspects: due to cavitation bubble burst when a powerful shock wave, part of the dirt layer under the action of the shock wave was stripped down, dispersed, emulsified, and fall off. Because the cavitation phenomenon produces bubbles, formed by the impact of the dirt layer and the gap between the surface layer and the gap penetration, due to this small bubbles and acoustic pressure synchronous expansion, contraction, like peeling the same physical force repeatedly act on the dirt layer, dirt layer layer by layer is peeled off, bubbles continue to penetrate inward until the dirt layer is completely peeled off. This is the secondary effect of cavitation. Ultrasonic cleaning in the cleaning fluid ultrasonic vibration impact on the dirt. Ultrasonic accelerate the dissolution process of the chemical cleaning agent on the dirt, chemical force combined with physical force to accelerate the cleaning process.
Eight, the main parameters of the ultrasonic cleaning machine:
1) Frequency: ≥ 20KHz, can be divided into low-frequency, medium frequency, high frequency 3 sections.
2) cleaning medium: the use of ultrasonic cleaning, generally two types of cleaning agents: chemical solvents, water-based cleaning agents. The chemical action of the cleaning medium can accelerate the effect of ultrasonic cleaning, ultrasonic cleaning is a physical role, the two roles combined to objects for full and thorough cleaning.
3) power density: power density = launch power (W) / launch area (cm2) is usually ≥ 0.3W/cm2, the higher the power density of ultrasound, the stronger the cavitation effect, the faster the speed, the better the cleaning effect. But for precision, surface finish is very high objects, using a long time of high power density cleaning will produce "cavitation" corrosion on the surface of the object.
4) ultrasonic frequency: the lower the ultrasonic frequency, the easier the cavitation generated in the liquid, resulting in a large force, the role of the stronger, applicable to the workpiece (coarse, dirty) initial wash. High frequency ultrasonic wave direction is strong, suitable for fine objects cleaning.
5) cleaning temperature: In general, ultrasonic cavitation at 30 ℃ -40 ℃ when the best results. Cleaning agent, the higher the temperature, the more significant effect. Usually the actual application of ultrasound, the use of 50 ℃ -70 ℃ working temperature.
Nine, common ultrasonic cleaning machine products:
1) KQ-700DV desktop CNC ultrasonic cleaner
2) KQ-600DV desktop CNC ultrasonic cleaner
3) KQ-500V desktop ultrasonic cleaner
4) KQ-500DV desktop CNC ultrasonic cleaner
5)High-power floor-standing SK-12E
6)KQ-700DE benchtop CNC ultrasonic cleaner
7)KQ-700DB benchtop CNC ultrasonic cleaner
8)KQ-700DA benchtop CNC ultrasonic cleaner
9)KQ-300V benchtop ultrasonic cleaner
10)KQ-600DB Desktop CNC Ultrasonic Cleaner
11)TH-100B Desktop CNC Ultrasonic Cleaner
12)TH-200 Desktop Ultrasonic Cleaner
13)TH-300BQ Desktop Ultrasonic Cleaner
14)TH-400BQG High-power Ultrasonic Cleaner
15)TH-500BQH constant temperature CNC ultrasonic cleaning machine
16)TH-600BQE CNC dual-frequency ultrasonic cleaning machine
17)TH-800V ultrasonic pipette cleaner
18)TH-800BY medical ultrasonic cleaner
19)THL-II ultrasonic cartridge Cleaner
20)THL-I type ultrasonic titanium rod cleaner