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Ultrasonic Parts Washing Equipment

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ultrasonic cleaning machine is based on the Ultrasonic cavitation bubbles that quickly formed and the countless rapid explosion in the ultrasonic cleaning solution . The resulting impact of dirt immersed in the cleaning solution inside and outside surfaces of the workpiece comes off . With the improvement of the ultrasonic frequency , the increase in the number of bubbles bursting impact weakened , therefore , particularly suitable for small high-frequency ultrasonic cleaning of the dirt particles without destroying the surface of the workpiece . The bubbles are applied to a high-frequency ( ultrasonic frequency ) , high intensity acoustic waves generated in the liquid . Therefore, any ultrasonic cleaning systems must have three basic components: a groove accommodating the cleaning liquid , the electrical energy into mechanical energy transducer generating a high frequency electric signal and an ultrasonic generator.


ultrasonic transducer and Ultrasonic generator
The most important part of the ultrasonic cleaning system of the transducer . Two existing transducer is a magnetic transducer , is made of nickel or a nickel alloy ; a Piezoelectric Transducer made ​​of lead zirconate titanate , or other ceramics. The piezoelectric material into a voltage change of the electric field , it will deform , which is called the ' piezoelectric effect ' . Relatively speaking, the magnetic transducer deformation will occur with changes in the magnetic field in the material .
Regardless of the transducer , the intensity of cavitation typically generated for the most basic factor . And other ultrasonic sound waves , is a series of pressure points , i.e., an alternating compression and expansion waves ( as shown below ) . If the acoustic energy is strong enough, the liquid is pushed in the expansion phase of the wave , thereby generating bubbles ; compression wave in phase, these bubbles burst or implosion moments in liquid , to produce a very effective impact, particularly for cleaning . This process is known of the role of the short .
Theoretically, cavitation bubble burst will produce more than 10,000 psi of pressure and 20,000 ° F (11,000 ° C) temperatures , and will quickly radiate outward in its moment of shock wave burst . The energy released by a single cavitation bubble is small, but there are several million per second cavitation bubbles burst simultaneously , the cumulative effect of it will be very strong , powerful impact force dirt surface spalling this is all the features of the ultrasonic cleaning .
If the ultrasonic energy is large enough, cavitation will generate around cleaning fluid , so tiny ultrasonic cleaning can effectively cracks and holes. Cavitation also promotes and accelerates the dissolution reaction of the surface film .
However, cavitation will be generated only in the region of a fluid pressure in the region below the gas pressure within the bubble , in order to satisfy this condition the amplitude of the ultrasonic wave generated by the transducer is sufficiently large . Cavitation minimum required power is called short of the critical point. Different liquids have different critical point of cavitation , the ultrasonic energy must exceed the critical point to achieve the cleaning effect . That is, only to produce energy exceeds the critical point of cavitation bubbles for ultrasonic cleaning.
The importance of frequency
When the operating frequency is low ( in the range of human hearing ) will produce noise. When the frequency is less than 20kHz, working noise only becomes large , and may exceed the limits specified in the Occupational Safety and Health Act or other regulations safe noise. High Power is required to remove dirt and damage the workpiece surface regardless of the application, generally selected from the range of 20kHz to 30kHz in the lower cleaning frequency . The cleaning frequency within the frequency range are often used for cleaning large, heavy parts or high density materials of the workpiece . 20KHz to 25KHz magnetic transducer and a piezoelectric transducer.
High frequency is typically used for cleaning smaller, more sophisticated parts, or remove tiny particles . High-frequency applications are also used to damage the workpiece surface is not allowed . The use of high frequency can improve cleaning performance from several aspects . As frequency increases , the number of cavitation bubbles increases linearly , resulting in more and more intense shock wave so that it can enter into a smaller gap. If power is kept constant, the smaller the cavitation bubbles , a corresponding reduction in the release of energy , which effectively reduces the damage to the workpiece surface . Another advantage is to reduce the high-frequency viscous boundary layer ( Park Nuri effect ) , so that the ultrasound can ' find' very small particles. Sidi pebbles can see this situation is similar to reducing the water level in the creek .Ultrasonic Parts Washing Equipment

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