Ultrasonic transducer is a device that can convert high-frequency electrical energy into mechanical energy. It is an energy conversion device. Its working principle is to convert the input electrical energy into mechanical energy (ultrasound) and then pass it on. Ultrasonic transducers play an important role in the ultrasonic welding process. The parameters of the ultrasonic transducer are: resonance frequency, transducer capacitance. The editor will lead you to understand the working mode of the transducer, the type and maximum power of the transducer, the installation and matching dimensions of the transducer.

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 of it is the computer frequency, that is, the actual operating frequency measured when the customer connects the transducer to the drive power supply through a cable and is energized when there is no load or load. Because the matching circuits of customers are different, the frequency of the same transducer with different driving power supply 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 capacitance bridge at a frequency of 400Hz-1000Hz, 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. How the transducer works

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 working current is not very large; 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 maximum power

The manufacturer of the complete machine may have different regulations for the nominal power of the machine for different purposes and purposes. In other words, the nominal power of the same transducer used on different machines may be different. In order 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 ultrasonic horn material, surface treatment method and shape. The ultrasonic transducer and the ultrasonic horn are connected with threads, the ultrasonic horn is connected with the ultrasonic mold, and the diameter, thickness, number and position of notches or screw holes at the flange of the ultrasonic horn.