The wide application of ultrasound

Ultrasound not only convenient are of great use in welding, ultrasonic wave is widely used in other industries, such as ultrasonic application in cleaning, ultrasonic how to complete the cleaning job, is the use of ultrasonic cavitation in the liquid, acceleration and straight into the flow of liquid and dirt of direct and indirect effect, make the dirt layer by dispersion, emulsification, stripping and cleaning. In the ultrasonic cleaning machine used, cavitation and direct flow action are used more. Cavitation: Cavitation is the ultrasonic wave with more than twenty thousand times per second compression force and pressure reduction interactive high frequency transformation to the liquid transmission. When the pressure is reduced, the phenomenon of vacuum nuclear group bubbles in the liquid will be produced. When the compression force is used, the vacuum nuclear group bubbles will produce a strong impact force when crushed by the pressure, so as to peel off the dirt on the surface of the cleaned object, so as to achieve the purpose of precision cleaning. Direct flow effect: ultrasonic wave in the liquid along the propagation direction of sound flow phenomenon known as direct flow. When the intensity of sound wave is 0.5W/cm2, the naked eye can see the direct inlet flow, which is perpendicular to the vibration surface and generates flow with a velocity of 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 produces convection. The dissolved liquid of the dissolved dirt mixes with the new liquid, which speeds up the dissolution rate and plays a great role in the handling of the dirt. Acceleration: The acceleration caused by the propelling of a liquid particle. For the high frequency of Shanghai ultrasonic cleaning machine, cavitation is very insignificant, then the cleaning is mainly by the acceleration of liquid particles under the action of ultrasonic impact particles to carry out ultra-precision cleaning of dirt.



The first world war humans learned to use ultrasonic, which is the use of "sonar" principle to detect underwater targets and their status, such as the position of submarines. At this time, people send a series of ultrasonic waves of different frequencies into the water, and then record and process the reflected echoes. From the characteristics of the echoes, we can estimate the distance, shape and dynamic changes of the detected objects. The earliest use of ultrasound in medicine is in 1942, Austrian doctor Dusick first use ultrasound technology to scan the brain structure; Then in the 1960s doctors began to use ultrasound to detect abdominal organs. Nowadays, ultrasonic scanning technology has become an indispensable tool in modern medical diagnosis.