20Khz 50mm Ultrasonic welding transducer for plastic welding
| Item |
Frequency |
Impedance |
Capacitance |
| 5020-4Z |
19.8 |
6 |
12000 |
Ultrasonic transducer is a kind of energy converter. Its function is to convert the input electric power into mechanical power (ultrasound) and then transmit it out, and it consumes only a small amount of power.
The ultrasonic generator converts 220V mains electricity into high-frequency current and transmits it to piezoelectric ceramics. The piezoelectric ceramics resonate at ultrasonic frequency. The piezoelectric effect of the material converts the electrical signal into linear mechanical vibration, and then passes the ultrasonic horn Amplify (reduce) the amplitude, and finally transmit it to the tool head for work. Ultrasonic transducers generally come in two forms: magnetostrictive and piezoelectric ceramics. All transducers used by our company are piezoelectric ceramics.
Magnetostriction: The effect of a material being deformed under the action of a magnetic field or a magnetic field is generated when the material is deformed. These materials usually incorporate nickel which exhibits strong magnetostriction. Magnetostrictive materials (usually laminated) are used in magnetostrictive sensors. Due to eddy currents, magnetostrictive transducers generally have higher losses than piezoelectric transducers, and therefore have higher cooling requirements.
The composition of ultrasonic transducer
Almost all piezoelectric transducers used for power ultrasound are of the anerin type, that is, one or more piezoelectric ceramics are mechanically compressed (prestressed) between the front driver and the rear driver.
The ultrasonic transducer is mainly composed of a central piezoelectric element, front and rear metal cover plates of porcelain elements, prestressed screws, telegraph sheets and insulation beads.
Rear driver: the circular cylindrical element on the back of the piezoelectric transducer. The rear driver is close to the last piece of piezoelectric ceramic, and the tightening pressure is usually applied by stacking bolts.
Electrode sheet: A thin conductive disc between the adjacent piezoelectric ceramics of the transducer. The transducer drive voltage is applied between these electrodes.
Front-end driver: Transmit the ultrasonic energy of the transducer to the horn or tool head. The front-end driver usually includes a mounting flange for connecting the housing. , Prestressed screw: A single stacked bolt passes through the center hole of Tao Moxibustion. After tightening the screw, the ceramic will be compressed between the rear driver and the front driver, thereby applying the required compliance stress to the electricity.
Piezoelectric ceramics: Piezoelectric Youyan is the heart of the transducer, a component that converts the electrical signal of the ultrasonic generator into linear mechanical vibration.
Ultrasonic welding transducer has the advantages of low heat generation, high output power, low resonance impedance, high conversion efficiency, and long continuous working time;
The principle of ultrasonic welding transducer is to offset the expansion stress of piezoelectric ceramics by applying prestress to achieve large amplitude and high frequency vibration;
Ultrasonic welding transducer is a high-power transducer, which requires a large instantaneous power and high requirements on materials and processes;
Usually combined with the horn and tool head to form a vibration system to complete the ultrasonic welding of plastics, metals and other materials;
Ultrasonic welding is the ultrasonic vibration generated by the transducer, which produces high-frequency vibration and frictional heat on the surface of the welded object contacting the gap under pressure, so as to achieve the purpose of cutting and hot-melt welding.
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