The Applications Of Ultrasonic Transducer
Ultrasonic transducers are widely used, and are divided into industry, agriculture, transportation, life, medical care and military according to the application industries. According to the realized functions, it is divided into ultrasonic processing, ultrasonic cleaning, ultrasonic detection, detection, monitoring, telemetry, remote control, etc.; according to the working environment, it is divided into liquid, gas, living body, etc.; according to the nature, it is divided into power ultrasonic, detection ultrasonic, ultrasonic imaging, etc.
1. Piezoelectric Ceramic Transformer
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, and it vibrates through the inverse piezoelectric effect. The vibration wave is mechanically coupled to the output part through the input and output parts, and the output part generates charges through the positive piezoelectric effect to realize the electrical energy of the piezoelectric body. - Two transformations of mechanical energy-electrical energy to obtain the highest output voltage at the resonant frequency of the piezoelectric transformer. Compared with electromagnetic transformers, this has the advantages of small size, light weight, high power density, high efficiency, breakdown resistance, high temperature resistance, not afraid of burning, no electromagnetic interference and electromagnetic noise, and simple structure, easy to make, easy to mass production, in Some areas become ideal replacement components for electromagnetic transformers and other advantages. Such transformers are used in switching converters, notebook computers, neon lamp drivers, and more.
2. Ultrasonic Motor
The ultrasonic motor uses the stator as a transducer, uses the inverse piezoelectric effect of the piezoelectric crystal to make the motor stator vibrate at the ultrasonic frequency, and then transmits energy by the friction between the stator and the rotor to drive the rotor to rotate. Ultrasonic motors have small size, large torque, high resolution, simple structure, direct drive, no braking mechanism, and no bearing mechanism. These advantages are beneficial to the miniaturization of the device. Ultrasonic motors are widely used in optical instruments, lasers, semiconductor microelectronics, precision machinery and instruments, robotics, medicine and bioengineering.
3. Ultrasonic Cleaning
The mechanism of ultrasonic cleaning is to use the physical effects of cavitation, radiation pressure, sound flow, etc. when the ultrasonic wave propagates in the cleaning solution, to mechanically peel off the dirt on the cleaning parts, and at the same time, it can promote the chemical generation between the cleaning solution and the dirt. reaction to achieve the purpose of cleaning objects. The frequency used by the ultrasonic cleaning machine can be selected from 10 to 500 kHz according to the size and purpose of the cleaning object, generally 20 to 50 kHz. As the frequency of the ultrasonic transducer increases, Langevin oscillators, longitudinal oscillators, thickness oscillators, etc. can be used. In terms of miniaturization, there are also radial vibration and bending vibration of the wafer vibrator. Ultrasonic cleaning is increasingly used in various industries, agriculture, household equipment, electronics, automotive, rubber, printing, aircraft, food, hospitals, and medical research.
4. Ultrasonic Welding
Ultrasonic welding can be divided into two categories: ultrasonic metal welding and ultrasonic plastic welding. Among them, ultrasonic plastic welding technology has been widely used. It uses the ultrasonic vibration generated by the transducer to transmit the ultrasonic vibration energy to the welding area through the upper weldment. Due to the large acoustic resistance in the welding area, that is, the junction of the two weldments, a local high temperature will be generated to melt the plastic, and the welding work will be completed under the action of contact pressure. Ultrasonic plastic welding can facilitate the welding of parts that cannot be welded by other welding methods. In addition, it also saves the expensive mold cost of plastic products, shortens the processing time, improves the production efficiency, and has the characteristics of economy, speed and reliability.
5. Ultrasonic Processing
When the fine abrasive is added to the workpiece with a certain static pressure along with the ultrasonic machining tool, the same shape as the tool can be machined. During processing, the transducer needs to generate an amplitude of 15 to 40 microns at a frequency of 15 to 40 kHz. The ultrasonic tool makes the abrasive on the surface of the workpiece continuously impact with a considerable impact force, destroying the ultrasonic radiation part, and breaking the material to achieve the purpose of removing the material. Ultrasonic processing is mainly used in the processing of brittle and hard materials such as gems, jade, marble, agate, and cemented carbide, as well as the processing of special-shaped holes and fine and deep holes. In addition, when adding ultrasonic transducer vibration to ordinary cutting tools, it can also play a role in improving accuracy and efficiency.
6. Ultrasonic Weight Loss
Using the cavitation effect and micro-mechanical vibration of the ultrasonic transducer, the excess fat cells under the human epidermis are broken and emulsified and then discharged from the body, so as to achieve the purpose of losing weight and shaping. This is a new technology developed internationally in the 1990s.
7. Ultrasonic Breeding
Appropriate frequency and intensity of ultrasonic irradiation on plant seeds can improve the germination rate of seeds, reduce the rate of mildew and rot, promote the growth of seeds, and improve the growth rate of plants. According to information, ultrasound can increase the growth rate of some plant seeds by 2 to 3 times.
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