Overview of Ultrasonic Transducers
The ultrasonic transducer part is mainly composed of three parts: transducer, amplifier (also known as secondary rod, booster), horn(also known as welding head).
Transducer (TRANSDUCER): The role of the transducer is to convert electrical signals into mechanical vibration signals. There are two physical effects that can be applied to convert electrical signals into mechanical vibration signals. A: Magnetostrictive effect, B: Inverse effect of piezoelectric effect. Magnetostrictive effect is commonly used in early ultrasonic applications. Its advantage is that it has a large power capacity; the disadvantage is that it is low in conversion efficiency and difficult to produce, and it is difficult to apply to mass industrial production. Since the invention of the Langevin piezoelectric ceramic transducer, the application of the reverse effect of the piezoelectric effect has been widely adopted. Piezoelectric ceramic transducers have the advantages of high conversion efficiency and suitable for mass production. The disadvantage is that the produced power capacity is relatively small. Existing ultrasonic machines generally use piezoelectric ceramic transducers. The piezoelectric ceramic transducer is made by sandwiching the piezoelectric ceramic between two metal front and rear load blocks and tightly connected by a screw. The output amplitude of the usual transducer is about 10 μm.
Horn: The function of the welding head is to make specific plastic parts and meet the requirements of the shape and processing range of the plastic parts.
Transducers, booster, and horn are all designed to be half the wavelength of the working ultrasonic frequency, so their size and shape must be specially designed. Any changes may cause changes in frequency and processing effects. They need to be modified. Professional production. Depending on the material used, the size will vary. The materials suitable for ultrasonic transducers, booster and horn are: titanium alloy, aluminum alloy, alloy steel, etc. Since ultrasonic waves vibrate constantly at a high frequency of about 20kHz, the requirements for materials are very high, which is not what ordinary materials can withstand.
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