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1. What is ultrasound? Waves can be divided into three kinds: infrasound, sound and ultrasound. The frequency of infrasound is below 20 Hz, the frequency of sound wave is between 20 Hz and 20 kHz, and the frequency of ultrasound is above 20 kHz. Infrasound and ultrasound are not audible to the human ear. Because of its high frequency and short wavelength, the ultrasonic wave has good direction and penetration ability, which is why the ultrasonic cleaning machine is designed and manufactured.
2. Composition of the ultrasonic cleaning machine: The ultrasonic cleaning machine is mainly composed of two parts: the ultrasonic cleaning tank and the ultrasonic generator. The ultrasonic cleaning tank is made of high quality stainless steel with strong elasticity and corrosion resistance. The bottom of the tank is equipped with an ultrasonic transducer oscillator. The ultrasonic generator generates high frequency and high pressure, which is transmitted to the transducer through a cable connection line. The transducer and the vibration plate produce high frequency resonance, so that the solvent in the cleaning tank can be cleaned by ultrasonic wave.
3. How to finish the cleaning work by ultrasonic wave: ultrasonic cleaning is to use the socialization, acceleration and direct inflow of ultrasonic wave in liquid to make the dirt layer dispersed, emulsified and peeled to achieve the purpose of cleaning. At present, the cavitation and direct inflow are most widely used in the ultrasonic cleaning machine.
(1) Cavitation: Cavitation is the transmission of ultrasonic waves to liquids by means of high-frequency transformation of compression force and pressure-reducing reciprocity more than 20,000 times per second. In the process of pressure reduction, vacuum nucleus bubbles are produced in liquid. In the process of compression, vacuum nucleus bubbles produce strong impact force when crushed under pressure, which peels off the dirt on the surface of the cleaned products, so as to achieve the purpose of precise cleaning.
Note: In the process of ultrasonic cleaning, the bubbles visible to the naked eye are not vacuum nucleus bubbles, but air bubbles, which can inhibit the cavitation and reduce the cleaning efficiency. Only when the air bubbles in the liquid are completely removed, the vacuum nucleus group bubbles with cavitation can achieve the best effect.
(2) Direct inflow: The phenomenon that ultrasound flows along the direction of sound propagation in liquid is called direct inflow. When the intensity of sound wave is 0.5W/cm2, direct inflow can be seen with naked eyes, and flow is generated perpendicular to the vibration surface. The velocity of flow is about 10cm/s. Through this direct inflow, the micro-oil dirt on the surface of the cleaned object is stirred, and the cleaning liquid on the surface of the dirt also generates convection. The solution of the dissolved dirt is mixed with the new solution, which speeds up the dissolution and plays a great role in the removal of the dirt.
(3) Acceleration: Acceleration caused by liquid particles. For the high frequency ultrasonic cleaning machine, the cavitation effect is not significant. At this time, the cleaning mainly relies on the acceleration impact particles under the action of liquid particle ultrasound to clean the dirt with ultra-precision.
4. The principle of ultrasonic cleaning is that the high-frequency oscillation signal emitted by the ultrasonic generator is converted into high-frequency mechanical oscillation by transducer and transmitted to the medium. The forward radiation of the ultrasonic wave in the cleaning solvent in the dense phase makes the liquid flow to produce tens of thousands of micro-bubbles, and the micro-bubbles (cavitation nucleus) existing in the liquid are in sound. Under the action of field vibration, when the sound pressure reaches a certain value, the bubbles grow rapidly and then close suddenly. When the bubbles close, a shock wave is generated, which generates thousands of atmospheric pressure around them, destroys the insoluble dirt and makes them disperse in the cleaning liquid. When the group particles are encased by oil dirt and adhere to the surface of the cleaning parts, the oil is emulsified, and the solid particles are separated, so as to achieve the cleaning. Purpose of surface cleaning of washed parts. Because of the inherent penetrating force of ultrasound, it can clean all kinds of objects with complex surface and special shape. It has a good cleaning effect on small holes and cracks. It is the best cleaning effect for objects with no sound absorption or small sound absorption coefficient.
5. Two main parameters of Jiahui Ultrasound: Frequency 20KHz-200KHz Power Density = Transmitting Power (W)/Transmitting Area (CM2)
6. Ultrasound cleaning effect and related data
(1) Cleaning media: Ultrasound cleaning, there are generally two types of cleaning agents, namely chemical solvents and water-based cleaning agents. The chemical action of cleaning medium can accelerate the effect of ultrasonic cleaning. The ultrasonic cleaning is a physical action, which combines the two functions to fully and thoroughly clean the object.
(2) Power density: The higher the power density of ultrasound is, the stronger the cavitation effect is, the faster the speed is, and the better the cleaning effect is. But for the object with high precision surface finish, long time high power density cleaning will cause cavitation and corrosion on the surface of the object.
(3) Ultrasound frequency: The lower the frequency of ultrasound, the easier the cavitation in the liquid, the greater the force produced and the stronger the effect. It is suitable for rough, dirty and initial washing of workpiece. High frequency makes the direction of ultrasound strong, and it is suitable for fine object cleaning.
(4) Cleaning temperature: Ultrasound has the best cavitation effect in the range of 30 40 in general, the higher the temperature of the cleaning agent, the more significant the effect. Usually, the working temperature of 40 60 is used in practical application of ultrasonic cleaning.
7. The advantages of ultrasonic cleaning have shown tremendous advantages. Especially in specialized and group enterprises, ultrasonic cleaning machine has gradually replaced traditional soaking, scrubbing, pressure washing, vibration cleaning and steam cleaning methods. The high efficiency and high cleanliness of ultrasonic cleaning machine benefit from its sound wave propagation in media. The penetration and cavitation shock are guilty, so it is easy to clean the parts with complex shape, inner cavity and hollow. For general degreasing, rust-proof, phosphating and other process, it can be completed in two or three minutes under the action of ultrasound. Its speed is several times higher than that of traditional methods, even tens of times, and its cleanliness can reach high standards. This can be achieved on many product surfaces. Where the quality and productivity requirements are high, the results that are difficult to achieve or irreplaceable by other treatment methods are highlighted.
The advantages are summarized as follows: u has good cleaning effect, high cleanliness and the cleanliness of all workpieces is the same. U cleaning speed, improve production efficiency. U does not require manual contact with cleaning fluid, safe and reliable. U can also clean deep holes, slits and workpiece concealment. U saves solvents, heat, workplaces and manpower, etc. Applicable to industry and scope of electronics, electrical, instruments, instruments, machinery, hardware, tools, bearings, hydraulic, electroplating pretreatment, medical, aviation, glass, glasses, clocks and watches, jewelry, ceramics, chemical fibers, pen making. (Provides various cleaning agents such as degreasing, dirt, wax, decarbonization, rust removal, oxidation, phosphating, etc.).
8. The application of ultrasound in view of the above principles, ultrasonic cleaning can be widely used in all walks of life, to achieve the purpose that other cleaning methods are difficult to achieve. Its main applications are listed as follows:
(1) Cleaning of mechanical parts (especially precision parts): bearings; gears; oil pumps and nozzles; cylinders; automotive copper and aluminium water tanks; mechanical watch cores; textile spindles, oil drills; cutting tools and cutting tools.
(2) Cleaning of optical components: optical lenses, optical fibers, etc.
(3) Cleaning of hydraulic components: hydraulic valve body, etc.
(4) Cleaning and treatment of electromechanical components: contacts, semiconductor tube holders, high-performance electrical connectors, etc.
(5) Semiconductor chip cleaning: single crystal silicon, etc.
(6) Printed circuit board cleaning: flux and flux.
(7) Surface treatment of metal products: such as rust removal, oil removal, phosphating, passivation, etc.
(8) Cleaning all kinds of glass bottles and utensils: removing oil and dirt.
(9) Cleaning of filters: filter element, filter screen, etc.
(10) Cleaning of various seals: various inks.
(11) Cleaning of precious metals: all kinds of dirt on jewelry, glasses, etc.
(12) Pre-plating treatment: high cleanliness cleaning before vacuum plating and electroplating.
(13) Eliminate the blockage of the pen head of the advanced drawing pen
(14) Cleaning after processing of jades: removing abrasive paste and dirt.
(15) Cleaning of brass instruments: Cleaning abrasive paste and dirt.
(16) Surface Treatment of Electric Furnace Wire after Cold Drawing
(17) Tableware cleaning: remove abrasive paste and dirt.
(18) Comb hole cleaning of nylon filament board
(19) Cleaning of comb holes in rubber separators of storage batteries
(20) Emulsification of diesel oil and water
(21) Uniform mixing of solvents
(22) Aging Treatment of Liquor
(23) Ultrasound Flotation of Seeds
Therefore, ultrasonic technology is widely used in automotive machinery and electronics industry, metallurgical processing, food processing, medical and health light industry textile, art and art, printing industry, rubber industry, medicine and family fields. In addition, ultrasonic technology can also be used in welding, metal and gemstone drilling, metal cutting and grinding processes, and has a broad application prospect.
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