In fact, some masks are made with ultrasonic waves---Nanshan ultrasonic spot melting machine

In fact, some masks are made with ultrasonic waves---Nanshan ultrasonic spot melting machine

We can hear all kinds of sounds from around us every day, but when the frequency of sound waves exceeds 20,000 hertz (Hz), we can no longer hear them. This kind of sound wave is called ultrasound. Ultrasound has the same essential properties as the sound we hear every day, the difference is the frequency is different. Ultrasonic propagation has the advantages of strong directivity, easy concentration of energy, and large enough propagation displacement. ‍And ultrasound is not far from our daily life. Some of the masks we use every day are made of ultrasound. ---Nanshan ultrasonic spot melting machine

　　

　　Schematic diagram of ultrasound positioning

　　in nature

　　"Super Sound"

　　Since we can't hear ultrasound, how did we discover it? This has to tell this little story: a scientist named Lazaro Spaltier found that bats can still fly flexibly and prey in the dark, so he did a series of experiments on bats: blindfolded bats Eyes, plugging the bat's nose, and smearing paint on the bat's body did not affect the bat's ability to fly. Finally, when the bat's ears are blocked, the bat can no longer fly freely and freely, and it becomes bumpy everywhere and quickly falls to the ground. Only then did Spaltier understand that bats rely on sound to "observe" the environment and avoid obstacles. ---Nanshan ultrasonic spot melting machine

　　

　　Bats use ultrasonic waves to move at night. Through further research, it has been found that bats can emit extremely high-frequency ultrasonic waves through their throats. The ultrasonic waves travel rapidly in a straight line, and when they encounter objects, they are reflected back like the light of a flashlight shining on a mirror. Its ears can pick up ultrasonic signals that the human ear cannot. Bats rely on this kind of ultrasound, which humans cannot hear, to navigate the dark night. There are not only bats in nature, but also other ultrasonic masters. Dolphins can use the airbags under their breathing holes to emit ultrasonic waves. The ultrasonic waves fed back by fish are information about predation. The ultrasonic waves emitted by the same kind can be used for communication, and the ultrasonic waves fed back by obstacles can be used to detect information about the surrounding environment. In addition, there are many animals that can emit or hear ultrasonic waves, such as elephants and jellyfish. Scientists imitate the phenomenon of ultrasonic waves in nature, using ultrasonic equipment to send out ultrasonic signals, which come back when they encounter other objects in the propagation medium. The azimuth and distance of the target can be measured by receiving and recording the time interval and azimuth of the returned ultrasonic waves. Scientists have designed the sonar system based on this principle.

　　"Ultrasound" Science Pioneer

　　With the rapid development of science and technology, ultrasonic technology is getting closer and closer to people's lives, and the scope of use is getting wider and wider. In the military field, submarines imitate dolphins and detect underwater combat targets through the ultrasonic waves emitted by the sonar system on the submarine. Ultrasound has very little attenuation in liquid, and it can also realize long-distance monitoring in the deep sea where one can't see five fingers. It is the most effective deep-sea detection method so far. In addition, ultrasonic waves are also used in weapons. The high-frequency sound waves emitted by ultrasonic weapons can cause strong air pressure to a certain extent, and cause physiological reactions such as blurred vision and nausea. In the field of scientific research, there is a new type of material called amorphous alloy. Amorphous alloys are prone to crystallization and oxidation during resistance welding. At this time, ultrasonic welding shows its outstanding advantages. The traditional electric welding process needs to rely on high temperature melting to realize the combination of two workpieces. When using ultrasonic welding, as long as a certain pressure is maintained, the continuous vibration of ultrasonic waves is used to make the upper and lower parts to be welded. The workpiece produces friction and deformation, which increases the temperature at the joint surface. This technology achieves non-melting solid welding, effectively avoiding spatter and oxidation during resistance welding. ---Nanshan ultrasonic spot melting machine

　　

　　Ultrasonic inspection of steel plates for defects In the latest high-end smartphones, amorphous alloys are used as eagle wing hinges for the screen rotating structure, which shows the special characteristics of this material. Researchers have recently discovered that the use of ultrasonic technology can achieve room temperature manufacturing and forming of amorphous alloys, which completely breaks through its traditional manufacturing and forming methods, and has attracted widespread attention from researchers in this field.

　　Ultrasound figure on the front line of anti-epidemic

　　The new coronavirus is still raging around the world. Masks are essential medical supplies to block the spread of the virus and have become hard currency in various countries. KN95 masks are composed of 5~6 layers of non-woven filter cloth, nose bridge strips and ear straps.

Among those used in mask production, ultrasonic welding technology is the core component of the KN95 mask automatic production line. The KN95 mask automatic production line is composed of a non-woven filter cloth feeding mechanism, an ultrasonic welding mechanism for the nose bridge line, an ultrasonic welding mechanism for ear straps and a mask folding mechanism. Taking the earband welding mechanism as an example, it uses the high-frequency vibration transmitted by ultrasonic waves to rub the earbands of the mask and the surface of the non-woven filter cloth against each other, resulting in local high temperature, so that the non-woven filter cloth and the earband are fused. After the ultrasonic wave is stopped, continue to maintain the pressure for a certain period of time to solidify the joint, so that the strength after welding can be close to the strength of the raw material. In addition, the indentation, edge sealing, and the assembly of the nose bridge line on the KN95 mask are all completed by the ultrasonic welding process. You may wish to take a mask and touch the joints to experience the actual combat results of ultrasonic welding technology. ---Nanshan ultrasonic spot melting machine