Variable Frequency Ultrasonic Transducer 15Khz for Auto Parts Welding for sale

Description:

Ultrasonic transducer is an energy conversion device. 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 transducer is mainly composed of a central piezoelectric ceramic element, front and rear metal cover plates, pre-stressed screws, electrode sheets and insulating tubes. The specific composition is shown in the figure below.

1. Rear driver: the cylindrical element on the back of the piezoelectric transducer, the rear driver is close to the last piece of piezoelectric ceramic, and the pre-tightening pressure is usually applied by stacking bolts.
2. Electrode sheet: a thin conductive disc between the piezoelectric ceramics adjacent to the transducer. The transducer drive voltage is applied between these electrodes.
3. 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.
4. Prestressed screw: A single stacked bolt passes through the center hole of the ceramic. After tightening the bolt, the ceramic will be compressed between the rear driver and the front driver to apply the required prestress to the ceramic.
5. Piezoelectric ceramics: Piezoelectric ceramics is the heart of the transducer, a component that converts the electrical signal of the ultrasonic generator into linear mechanical vibration.

Specifications:

Is the prestress of the transducer larger the better?

Excessive prestress will reduce the performance of the transducer, which is mainly reflected in the following aspects:

The performance of piezoelectric ceramics changes under the action of compression bias. In particular, the maximum safe temperature at which the material can work effectively may be greatly reduced, and high compressive stress may lower the Curie temperature.
Excessive pretension will cause significant depolarization, and will also produce unstable impedance and aging.
Excessive prestress will reduce the service life of the transducer, and in severe cases will cause the ceramic chip of the transducer to crystallize.
Excessive prestress of the transducer will show a smaller impedance in the early stage, but the performance of the transducer will decrease with the passage of time, and it will be accompanied by high-impedance products.

Variable Frequency Ultrasonic Transducer 15Khz for Auto Parts Welding for sale