Views: 1 Author: Site Editor Publish Time: 2019-04-18 Origin: Site
Ultrasonic transducers are widely used. They are divided into industry, agriculture, transportation, life, medical and military according to the applied industry. According to the functions realized, it is divided into ultrasonic processing, ultrasonic cleaning, ultrasonic detection, detection, monitoring, telemetry, remote control, etc.
Piezoelectric ceramic transformers use the piezoelectric effect of the piezoelectric body after polarization to achieve voltage output. The input part is driven by a sinusoidal voltage signal, which is vibrated by an inverse piezoelectric effect. The vibration wave is mechanically coupled to the output part through the input and output parts.
The output part generates electric charge by the positive piezoelectric effect, and realizes the electric energy-mechanical energy-electric energy conversion of the piezoelectric body, and obtains the highest output voltage at the resonant frequency of the piezoelectric ultrasonic transducer. Compared with electromagnetic transformers, this has small size, light weight, high power density and high efficiency,it is resistant to breakdown, high temperature, there is not afraid of burning, no electromagnetic interference and electromagnetic noise, and simple structure, easy to manufacture, easy to mass production, in some areas become an ideal replacement component of electromagnetic transformers. Such transformers are used in switching converters, notebook computers,light driver, etc.
2, ultrasonic motor
The ultrasonic motor uses the stator as a transducer. The inverse piezoelectric effect of the piezoelectric crystal causes the motor stator to vibrate at the ultrasonic frequency, and then the friction between the stator and the rotor transfers energy to drive the rotor to rotate. Ultrasonic motor is small in the size and large in torque.
High resolution, simple structure, direct drive, non-brake mechanism,non-bearing mechanism, these advantages are beneficial to the miniaturization of the device. Ultrasonic motors are widely used in the optical instruments, lasers, semiconductor microelectronics, precision machinery and instruments, robotics, medicine and biotechnology.
3, ultrasonic cleaning
The mechanism of ultrasonic cleaning transducer is to use the physical effects such as cavitation, radiation pressure and sound flow when the ultrasonic wave propagates in the cleaning liquid, to peel off the mechanical phenomenon generated by the dirt on the cleaning member, and at the same time to promote the chemistry of the cleaning liquid and the dirt. Reaching the purpose of cleaning the object has frequency used by the ultrasonic cleaner can be selected from 10 to 500 kHz depending on the size and purpose of the cleaning object, and is generally 20 to 50 kHz. As the frequency of the ultrasonic transducer increases a Langevin oscillator, a longitudinal vibrator, a thickness vibrator, etc. in terms of miniaturization.
There are radial vibrations and bending vibrations using a disk oscillator. Ultrasonic cleaning is used more and more widely in the various industries, agriculture, household equipment, electronics, automotive, rubber, printing, aircraft, food, hospital and medical research.
4, ultrasonic welding
ultrasonic textile welding transducer has two major categories: ultrasonic metal welding and ultrasonic plastic welding. Among them, ultrasonic plastic welding technology has been widely used. It uses ultrasonic vibration generated by the transducer to transmit ultrasonic vibration energy to the weld zone through the upper weldment due to welding. that is, the junction of the two weldments has a large sound resistance, so local high temperature is generated to melt the plastic, and the welding work is completed under the contact pressure. Ultrasonic plastic welding facilitates the welding of parts that cannot be welded by other welding methods. In addition, it also saves expensive mold costs for plastic products.
5, ultrasonic processing
The fine abrasive is applied to the workpiece with a certain static pressure along with the ultrasonic processing tool, and the same shape as the tool can be processed. The transducer needs to produce an amplitude of 15 to 40 microns at a frequency of 15 to 40 kHz during processing. Ultrasonic tool makes the surface of the workpiece.
Processing. In addition, when the ultrasonic transducer is vibrated on a common cutting tool, it can also improve the accuracy and efficiency.
6, ultrasonic weight loss
Ultrasonic degreasing was used in the bed and succeeded, 33KHz piezoelectric transducer is creating a precedent for plastic surgery and beauty. Ultrasonic degreasing technology has developed rapidly at home and abroad.
7, ultrasonic breeding
Ultrasonic irradiation of plant seeds with the appropriate frequency and intensity can increase the germination rate of seeds, reduce the rate of mildew, promote the growth of seeds, and increase the growth rate of plants. According to the data, ultrasound can increase the growth rate of some plant seeds by 2 to 3 times.
8, electronic blood pressure monitor
The piezoelectric ceramics transducer is used to receive the pressure of the blood vessel. When the balloon is pressed against the blood vessel, the applied pressure is higher than the vasodilating pressure, and the ultrasonic transducer does not feel the pressure of the blood vessel; and when the airbag is gradually deflated, the ultrasonic transducer pair .The pressure on the blood vessels is reduced.
