First, the principle of ultrasonic cleaning machine The basic composition of ultrasonic cleaning machine is: ultrasonic generator, transducer and cleaning sink.
First, the ultrasonic generator converts AC power to ultrasonic frequency power, and its frequency range is generally 16KHZ--68KHZ, up to 1000KHZ, and then the power is sent to the transducer through the cable. The transducer is often composed of several acoustic heads. The parallel combination is a sound array, in which the electrical energy is converted into the mechanical vibration energy of the same frequency and transmitted to the cleaning tank to form an ultrasonic sound field that oscillates back and forth in the cleaning liquid.
In the ultrasonic sound field, the vibrating negative pressure area cannot be replenished due to the surrounding liquid and forms numerous tiny vacuum bubbles. When the positive pressure comes, the tiny air bubbles suddenly close under pressure, and violent collision between the liquids generates a great shock wave. The formation of several thousand to tens of thousands of atmospheric pressure and instantaneous high temperature on Baidu, which is the "cavitation" role of ultrasound.
Cavitation has a very good cleaning and emulsifying effect, so that oil pollution from the surface of the cleaning workpiece, thus achieving a fast, clean cleaning purposes.
Second, the advantages of ultrasonic cleaning
1, clean and thorough: microscopic observation can be seen, the surface of the laundry pits, the bottom of the processing marks and the heel of the thread can be washed clean.
2, speed: Compared with immersion cleaning can improve work efficiency 10-20 times. Spray cleaning can improve efficiency by 20%-50%.
3, no dead angle: Compared with the spray, it does not clean the dead angle, so it is more suitable for complex internal and external structure, microscopic unevenness, with slits, holes, corners, components dense parts.
4, the workpiece does not deform, will not fly: Compared with the spray, for the thin plate workpiece and small parts will not be deformed and scattered.
5, to adapt to a variety of processes: can be used for degreasing, decontamination, derusting, in addition to oxide skin, passivation, and a variety of other processes.
6, for a wide range of materials: for steel, cast iron, stainless steel, copper, aluminum, glass, circuit boards, electronic and optical components and other parts.
Third, the ultrasonic cleaning effect and related physical quantities
1. Frequency: Generally refers to the fundamental frequency of the transducer. When the frequency is low, the 'cavitation' effect is easy to occur, but the cleaning accuracy is low, there is a certain cavitation corrosion of soft metals such as copper, aluminum, and is more suitable for coarse cleaning; high-frequency wave density, but the equipment components are very demanding High, costly, more suitable for precision cleaning.
2, power: enough output power is the basic guarantee of the ultrasonic cleaning equipment, otherwise the appearance is beautiful again, the function is comprehensive again, the end is still invisible to use "low energy child". But excessive pursuit of power is not economical.
3, power density: the definition is: Ï = W ÷ F (power density = transmit power ÷ emission area) usually when the frequency is around 20KHz, Ï â‰¥ o.33W/cm2, otherwise it is difficult to occur cavitation, if you consider To the absorption and attenuation of ultrasonic waves by workpieces and workstations, the value of Ï should be increased. According to the company's experience, generally, when the Ï value is increased to 0.5 to 0.75, stable and excellent ultrasonic cleaning can be achieved.
4. Washing temperature: Ultrasonic wave is best at 40°C-50°C. The higher the temperature, the more favorable the decomposition of the contaminants, but when the temperature reaches 70-80 °C the ultrasound works, but the cleaning effect is reduced.