Media

      Driven by technology, the development of ultrasonic cleaning machines is getting faster and faster, mainly because of the good ultrasonic cleaning effect and the simple operation of the equipment. What needs to be emphasized is the power of the ultrasonic cleaning machine, which has a direct relationship with the cleaning effect.

      The sound that people hear is a sound wave signal with a frequency of 20-20000Hz, so the sound wave higher than 20000Hz is called ultrasonic wave. Since the transmission of sound waves follows the longitudinal propagation of the sinusoidal curve, one layer is stronger and the other is weaker , which are transmitted in turn, so when the weak acoustic signal acts on the liquid, it will generate a certain negative pressure on the liquid, that is, the volume of the liquid increases, the molecular gap in the liquid increases, and many tiny bubbles are formed.

      Ultrasonic cleaning machine uses this point to play a cleaning role, and the operating frequency of the equipment must be kept within a certain range, if the frequency is lower than 20kHz, not only the working noise will not only become very large , and may exceed safe noise limits set by the Occupational Safety and Health Act or other regulations.

      Under normal circumstances, in applications that require the high power of an ultrasonic cleaner to remove dirt without concern for surface damage, a lower cleaning frequency in the range of 20kHz to 30kHz is usually selected. Cleaning frequencies in this frequency range are often used to clean large, heavy parts or workpieces with high density materials.

      Ultrasonic cleaning machine using low frequency is usually used to clean smaller, more precise parts, or remove tiny particles; and high frequency is also used for applications where the surface of the workpiece is not allowed to be damaged, with the frequency increases, the number of cavitation bubbles increases linearly, resulting in more and denser shock waves that can penetrate into smaller gaps.

      If the power of the ultrasonic cleaning machine remains unchanged, the cavitation bubbles become smaller, and the energy released by them decreases accordingly, which effectively reduces the damage to the workpiece surface. So for ultrasonic cleaning, another advantage of high frequency is to reduce the viscous boundary layer.