Working process and technical parameters of ultrasonic cleaning equipment

Addtime：2019-03-21 09:47:18 Visits：886 Share：

Working Process and technical Parameters of Ultrasonic cleaning equipment

Ultrasonic cleaning equipment utilizes the socialization effect, acceleration effect, and direct flow effect of ultrasonic waves in liquids to directly and indirectly act on liquids and contaminants, causing the contaminant layer to be dispersed, emulsified, and stripped to achieve the cleaning purpose. Among the ultrasonic cleaning machines currently in use, cavitation and direct flow effects are applied more frequently. (1) Cavitation: Cavitation refers to the transmission of ultrasonic waves into a liquid in a high-frequency alternating manner of more than 20,000 times per second of compressive and compressive forces. Under the effect of depressurization, the phenomenon of vacuum bubble clusters is generated in the liquid. When ultrasonic cleaning is subjected to compressive force, the vacuum bubble clusters are crushed under pressure, generating a powerful impact force, which peel-off the dirt on the surface of the object to be cleaned, thereby achieving the purpose of precise cleaning. (2) Direct current effect: The phenomenon where ultrasonic waves flow in a liquid along the direction of sound propagation is called direct current. When the intensity of the sound wave is 0.5W/cm ², a direct flow can be observed with the naked eye, generating a flow perpendicular to the vibration surface, with a flow velocity of approximately 10cm/s. This direct flow stirs the micro-oil dirt on the surface of the object to be cleaned, and the cleaning liquid on the dirt surface also generates convection. The dissolved liquid that dissolves the dirt mixes with the new liquid, accelerating the dissolution speed and playing a significant role in the transportation of the dirt. (3) Acceleration: The acceleration generated by the push of liquid particles. For ultrasonic cleaning machines with higher frequencies, cavitation is not very significant. At this time, the cleaning mainly relies on the acceleration of liquid particles under ultrasonic action to impact particles and perform ultra-precise cleaning of dirt. The main parameters of ultrasonic cleaning equipment: 1. Frequency: ≥" 20KHz can be divided into three segments: low frequency, medium frequency and high frequency. 2. Power density: Power density = emission power (W)/ Emission area (cm ²) usually ≥ At 0.3W/cm ², the higher the power density of ultrasonic waves, the stronger the cavitation effect, the faster the speed, and the better the cleaning effect. However, for precise objects with extremely high surface finish, prolonged high-power-density cleaning can cause "... "effects on the object's surface. "Cavitation" Corrosion. 3. Ultrasonic frequency: The lower the ultrasonic frequency, the easier cavitation occurs in the liquid, the greater the force generated, and the stronger the effect. It is suitable for the initial cleaning of workpieces (rough and dirty). The higher the frequency, the stronger the directionality of ultrasonic waves, which is suitable for cleaning delicate objects. 4. Cleaning temperature: Generally speaking, the cavitation effect of ultrasonic waves is the best at 30℃-40℃. The higher the temperature of the cleaning agent, the more significant its effect. In practical applications of ultrasonic waves, a working temperature range of 50℃ to 70℃ is usually adopted.