Ultrasonic transducer is a kind of energy conversion device. Its function is to convert the input electric power into mechanical power (ultrasound) and then transmit it, and it consumes a small part of the power (less than 10%). Therefore, the problem that should be considered when using an ultrasonic transducer is the matching with the input and output ends, followed by mechanical installation and matching dimensions. There are many types of ultrasonic machines on the market, and customers must provide accurate and reliable indicators to ensure that the transducer products provided can be well matched with your expensive machines and perform well.
Due to the wide variety of transducers, here are some transducer parameters.
① Resonance frequency: f, unit: KHz
The frequency refers to the frequency measured by the transmission line method with a frequency generator, millivoltmeter, etc., or the frequency measured with an impedance characteristic analyzer or similar instruments. Generally known as small signal frequency. The opposite is the machine frequency, that is, the actual operating frequency measured when the customer connects the transducer to the drive power supply through a cable and is powered on with no load or load. Because the matching circuits of customers are different, the frequency displayed by the same transducer with different driving power is different, and such frequency cannot be used as the basis for ordering.
② Transducer capacity: CT, unit: PF
That is, the free capacitance of the transducer can generally be measured with a capacitor bridge at a frequency of 400Hz-0Hz, or an impedance characteristic analyzer similar to the instrument. No matter how simple it is, measuring with a general portable capacitance meter can also meet the requirements.
③ Working mode of transducer
Due to different processing methods and requirements, the working mode of the transducer can be roughly divided into continuous work (lace machine, CD set machine, zipper machine, metal welding, etc.) and pulse work (such as plastic welding machine). The requirements of the transducer are different. Generally speaking, continuous work has almost no pause time, but the operating current is not very large, and the pulse work is intermittent, with pauses, but the instantaneous current is very large. On average, the power in both states is large.
④ Transducer type and high power
Machine manufacturers may have different regulations for the nominal power of machines for different purposes and purposes. In other words, the nominal power of the same transducer used on different machines may be different. To avoid ambiguity, customers should specify the structure of the transducer, such as column type, inverted horn type, etc., as well as the diameter and number of piezoelectric ceramic wafers.
⑤ Installation and matching dimensions
Mainly include horn material, surface treatment method and shape. The connecting thread of the transducer and the horn, the connecting thread of the horn and the mold, the diameter, thickness, number and position of notches or screw holes at the flange of the horn.
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