The difference between ultrasonic wave and high frequency wave is that both have a wave. Many people think that high-frequency waves are a kind of ultrasonic waves, and their difference is only the frequency. In fact, this is a completely wrong understanding. Simply put, ultrasonic waves are sound waves and high-frequency waves are electromagnetic waves. Aren't they the same wave? Will it be the same again?
According to their definition, ultrasonic wave is sound wave with frequency higher than 20000Hz, which has good directivity and strong penetration ability, and it is easy to obtain concentrated acoustic energy, while high-frequency wave refers to electromagnetic wave with frequency higher than 100 kHz. The high-frequency electromagnetic field is used to make the molecules in the material collide with each other violently to produce high temperature to achieve the purpose of welding and welding, while the ultrasonic wave uses the principle that friction generates heat and plastic components are not easy to dissipate heat to generate a lot of heat to achieve the purpose of welding and welding.
High-frequency machine uses high-frequency electric field to make molecules in plastics oscillate to generate heat energy to fuse various products. The electromagnetic field generated by the oscillation of high-voltage rectification self-excited electron tube instantly changes the molecules of plastic, and achieves the effects of welding, cutting, sealing and inlaying under the action of external pressure and mold. The operation is easy to learn and understand, the efficiency is high, it is suitable for welding and cutting of large plastic products, the process is simpler and the effect is more perfect. High-frequency welding machine is suitable for welding, fusing and bronzing of various PVC-based plastics. Blister packaging (including upper and lower double blister heat sealing trimming, blister and cardboard heat sealing trimming, etc.). ), automobile interior parts, cushions, trademarks, stationery, stickers, plastic covers, blowing toys, footwear products, rain sails, umbrellas, raincoats, purses, famous brands, waterbeds, sun visors, door panels, heat sealing processing of various packaging bags, portable soft bags, and patterns of various concave-convex switches.
Ultrasonic can be used for ranging, measuring speed, cleaning, welding, breaking stones, sterilization and disinfection. Now the developed welding products include ultrasonic plastic welding machine, ultrasonic metal welding machine, ultrasonic cleaning machine and other welding machines. High-frequency is mainly used in blister packaging, automobile interiors, cushions, trademarks, stationery, stickers, plastic covers, blowing toys, footwear products, raincoats, rain sails, umbrellas and so on. High-frequency welding can only weld pure PVC or soft and hard films, leather or cloth containing more than 30% PVC, and ultrasonic welding machines are widely used. Ultrasonic welding can weld most plastics and a small amount of metals.
Theoretical research shows that the vibration energy of an object is directly proportional to the vibration frequency under the same amplitude. When the ultrasonic wave propagates in the medium, the vibration frequency of the medium particles is very high, so the energy is very large. In the dry winter in northern China, if the ultrasonic wave is put into the water tank, the violent vibration will break the water in the water tank into many small drops, and then the water drops will be blown indoors by a small fan. You can increase the humidity of the indoor air. This is the principle of ultrasonic humidifier. For pharyngitis, tracheitis and other diseases, it is difficult for drugs to flow to the affected area. Using the principle of humidifier, the therapeutic effect can be improved by atomizing the liquid medicine for patients to inhale. Using the great energy of ultrasonic waves and violent forced vibration, stones in human body can be crushed, thus alleviating pain and achieving the purpose of cure. This is the application of ultrasound in medical treatment.
Ultrasonic metal welding machine uses tens of thousands of high-frequency vibration waves per second to transmit to the surfaces of two metal workpieces to be welded, and then applies a certain pressure to make the metal surfaces rub against each other to form the fusion between molecular layers, thus achieving the purpose of welding. It can weld copper, aluminum, tin, nickel, gold, silver, molybdenum, stainless steel and other non-ferrous materials such as thin plates, thin rods, wires, sheets, strips and other materials in an instant, with a total thickness of 2-4 mm. Welding cases include lithium batteries, polymer batteries, copper foil and nickel plates, aluminum foil and aluminum sheets. The wires are fused with each other, offset into one and fused with multiple wires, and the wire harness is welded. Wires are fused with various electronic components, contacts and connectors. Fusion of large heat sinks, heat exchange fins and honeycomb cores for various household appliances and automobile supplies. High-current contacts such as electronic component leads, relays, electromagnetic switches and fuseless switches, and mutual melting of dissimilar metal plates. The sealing and cutting of the metal tube can be watertight and airtight.
Ultrasonic can also be used to weld plastic products without adding any reagents and other auxiliary materials. Ultrasonic plastic welding machine is widely used in plastics, electronics, toys, digital and other fields.