We know that when an object vibrates, it makes a sound. Scientists call the number of vibrations per second the frequency of sound, in Hertz. The frequency of sound waves that we human ears can hear is 20 ~ 20000 Hz. When the vibration frequency of sound wave is greater than 20000 Hz or less than 20 Hz, we can't hear it. Therefore, we call sound waves with frequencies higher than 20000 Hz "ultrasonic". The ultrasonic frequency commonly used in medical diagnosis is 1 ~ 5 MHz. Ultrasonic wave has the characteristics of good directivity, strong penetration ability, easy to obtain concentrated sound energy, long propagation distance in water and so on. It can be used for ranging, speed measurement, cleaning, welding, gravel, etc. It has many applications in medicine, military, industry and agriculture.
Theoretical research shows that under the condition of the same amplitude, the vibration energy of an object is directly proportional to the vibration frequency. When ultrasonic waves propagate in the medium, the vibration frequency of medium particles is very high, so the energy is very large In the dry winter in northern China, if the ultrasonic wave is introduced into the water tank, the violent vibration will break the water in the tank into many small droplets, and then blow the droplets indoors with a small fan, the indoor air humidity can be increased This is the principle of ultrasonic humidifier iaryngopharyngitis. Tracheitis and other diseases, it is difficult for Jinbai to reach the diseased part when calling Jinnian Using the principle of humidifier, atomize the liquid medicine and let the patient inhale, which can improve the curative effect Using the huge energy of ultrasound can also make the stones in human body vibrate violently and break, so as to slow down the pain and achieve the purpose of cure.
Now, with the continuous development of society, ultrasonic has played an important role in plastic welding, and has been applied to various industries and highly recognized.
Compared with the traditional process, ultrasonic plastic welding equipment has the following advantages:
1. Fast and accurate - most ultrasonic welding can be completed in 0.1-0.5 seconds
2. Stable quality ---- mechanized production, stable and reliable product quality
3. Economic benefits - avoid using a large number of fixtures and adhesives, reduce labor and reduce costs
4. Beautiful and clean - the surface is well formed without damage or deformation. No scratch and adhesive residue
5. The process is simple - there is no need for preheating, cleaning and other front and rear processes
6. Convenient operation ---- as long as the welding parameters are set, the operation is very convenient
7. High strength and good air tightness - the weld composition is the same as that of the base metal, with high strength, good air tightness, no water leakage and air permeability
8. Automatic welding can be realized ----- 15K ultrasonic plastic welding machine is very easy to realize automation,