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Ultrasonic welding machine welding system - selection of ultrasonic transducer, horn and welding head

How the ultrasonic transducer works

Ultrasonic transducer converts electrical energy into mechanical vibration and amplifies it Amplitude components mainly include ultrasonic transducers, ultrasonic horns and ultrasonic welding joints. The working principle of the ultrasonic transducer on the ultrasonic plastic welding machine is to use the inverse piezoelectric effect of the piezoelectric ceramic material to generate vibration. Piezoelectric crystals are placed in an external electric field. Under the action of the electric field, the center of gravity of the positive and negative charges inside the crystal moves. This polarization shift causes the crystal to deform. This is called the reverse piezoelectric effect.

Ultrasonic horn is an important component of the ultrasonic vibration system in ultrasonic treatment equipment part one. During the operation of the ultrasonic vibration system, since the vibration amplitude generated by the radiating surface of the ultrasonic transducer is small, when the operating frequency is in the range of 20 kHz, the amplitude of the radiating surface of the ultrasonic transducer is only a few times in ultrasonic welding. microns, the required amplitude is approximately tens to hundreds of microns. Therefore, it is necessary to use a horn to amplify the displacement and moving speed of mechanically vibrating particles and concentrate the ultrasonic energy on a smaller area to produce an energy collection effect. Ultrasonic horns can also be used as mechanical impedance converters to bridge the gap between the transducer and the load for impedance matching, allowing ultrasonic energy to be transmitted more efficiently from the transducer to the load.

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