Principle of Ultrasonic Automatic Cleaning Machine

2024-07-13 14:05:50

The principle of ultrasonic automatic cleaning machine is mainly to convert the sound energy of the power ultrasonic frequency source into mechanical vibration through a transducer, and radiate the ultrasonic waves into the cleaning solution in the tank through the cleaning tank wall. Due to the radiation of ultrasonic waves, microbubbles in the liquid inside the tank can maintain vibration under the action of sound waves. Disrupting the adsorption of dirt and cleaning surfaces, causing fatigue damage to the dirt layer and detachment, and the vibration of gas bubbles scrubbing the solid surface.

Ultrasonic waves are sound waves with frequencies higher than 20000 Hz. They have good directionality, strong penetration ability, and are easy to obtain concentrated sound energy. They have a long propagation distance in water and can be used for distance measurement, speed measurement, cleaning, welding, crushing, sterilization, and disinfection. There are many applications in medicine, military, industry, and agriculture. Ultrasound is named after its lower frequency limit, which is approximately equal to the upper limit of human hearing. The principle of ultrasonic automatic cleaning machine is mainly to convert the sound energy of the power ultrasonic frequency source into mechanical vibration through a transducer, and radiate the ultrasonic waves into the cleaning solution in the tank through the cleaning tank wall. Due to the radiation of ultrasonic waves, microbubbles in the liquid inside the tank can maintain vibration under the action of sound waves.

When the sound pressure or intensity reaches a certain level of pressure, bubbles will rapidly expand and then suddenly close. During this process, a shock wave is generated at the moment when the bubble closes, causing a pressure of 1012-1013pa and local temperature adjustment around the bubble. The enormous pressure generated by ultrasonic cavitation can destroy insoluble pollutants and cause them to differentiate into the solution. Steam type cavitation has a direct reverse impact on the pollutants.

On the one hand, it can destroy the adsorption between the dirt and the surface of the cleaning part, and on the other hand, it can cause fatigue damage of the dirt layer and be rejected. The vibration of gas bubbles cleans the solid surface. Once there is a gap in the dirt layer that can be drilled, the bubbles immediately "drill in" and vibrate to make the dirt layer fall off. Due to cavitation, the two liquids quickly disperse and emulsify at the interface. When solid particles are wrapped in oil and adhere to the surface of the cleaning part, the oil is emulsified and the solid particles fall off on their own. When ultrasound propagates in the cleaning liquid, positive and negative alternating sound pressure is generated, forming a jet that impacts the cleaning part. At the same time, due to nonlinear effects, acoustic flow and micro acoustic flow are generated. Ultrasonic cavitation produces high-speed micro jets at the interface between solid and liquid. All of these effects It can destroy dirt, remove or weaken boundary fouling layers, and increase stirring and diffusion effects, Accelerate the dissolution of soluble pollutants and enhance the cleaning effect of chemical cleaning agents. From this, it can be seen that wherever a liquid can penetrate and a sound field exists, there is a cleaning effect, which is suitable for cleaning parts with very complex surface shapes. Especially after adopting this technology, the amount of chemical solvents used can be reduced, greatly reducing environmental pollution.

The second ultrasonic wave propagates in the liquid, causing the liquid and the cleaning tank to vibrate together at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequency, which is the frequency of sound waves, so people hear buzzing sounds.

In addition, during the ultrasonic cleaning process, the visible bubbles are not vacuum core bubbles, but air bubbles, which suppress cavitation and reduce cleaning efficiency. Only when the air bubbles in the liquid are completely dragged away, can the cavitation effect of vacuum core bubbles achieve good results.