28Khz High Power Ultrasonic Transducer With Booster For Plastic Ultrasound Welder

High Power 28Khz Ultrasound Transducer with Booster for Plastic Welder

Ultrasonic vibrator principle:

The horn is a passive device that does not generate vibration itself. It simply changes the amplitude of the input vibration and then transmits it out, completing the impedance transformation. Ultrasonic transducers can generate regular vibrations under suitable electric field excitation. The amplitude is generally about 10 microns. It is not enough to complete the welding and processing steps directly. Therefore, the transducers are connected with a properly designed horn. Thereafter, the amplitude of the ultrasonic waves can be varied over a wide range as long as the material strength is sufficient and the amplitude can exceed 100 microns.

Specifications:

The main components of the ultrasonic welder:

The ultrasonic welding machine is mainly composed of the following parts: a generator, a pneumatic part, a program control part, and a transducer part. The main function of the generator is to convert the power frequency of the power frequency 50Hz into high-frequency (for example, 20KHz) high-voltage waves by using electronic circuits; the main function of the pneumatic part is to complete the pressure and pressure holding work in the process; Partially control the workflow of the whole machine to achieve a consistent processing effect; the transducer part converts the high-voltage electric wave generated by the generator into mechanical vibration, and transmits, amplifies, and reaches the machined surface.
At present, there are two kinds of generators that are widely used in China: one is a bridge type power amplifier circuit represented by American BRANSON company, and the protection circuit adopts phase protection, and the working frequency is generally 20KHz. The advantage is that the electric conversion efficiency is high, the disadvantage is that the frequency adjustment inductance has a narrow adjustment range and the frequency tracking performance is poor; another disadvantage is that the power cannot be made very large, and the maximum is the 3KW left vibration friction welding machine right; the other is Taiwanese machines generally use Class B power amplifiers, overcurrent protection, and bridge feedback. The advantage is that the power can be made larger (such as 4.2KW), the frequency tracking performance is good, and the working frequency of 15KHz is generally used in the case of high power. The disadvantage is that the conversion efficiency is low, the working frequency of 15KHz is heard by the human ear, reflecting the noise, and there are also machines using automatic frequency tracking technology in Switzerland, Germany and Japan. Because of its high price, it is not common in China.

High Power 28Khz Ultrasound Transducer with Booster for Plastic Welder