Ultrasonic effect of ultrasonic welding machine

When the ultrasonic propagates in the medium, the physical and chemical changes of the medium occur due to the interaction between the ultrasonic and the medium, resulting in a series of mechanical, thermal, electromagnetic and chemical ultrasonic effects

Mechanical effect

The mechanical action of ultrasound can make the liquid emulsify, make the gel liquefy and disperse the solid. When standing wave is formed in ultrasonic fluid medium, due to mechanical force, micro particles suspended in the fluid will condense on the wave node and form Periodic space accumulation. When ultrasound propagates in piezoelectric and magnetostrictive materials, induced polarization and magnetization are caused by its mechanical action (see dielectric physics and magnetostriction).

Cavitation.

A large number of small bubbles will be produced when ultrasound acts on liquid. One reason is that the internal parts of the liquid present tensile stress and form negative pressure. The decrease of pressure makes the gas dissolved in the liquid supersaturate and become small bubbles. Another reason is that the strong pulling force "tears" the liquid into a hole called a "hole". In vacuum, there are liquid vapor or other gases dissolved in the liquid, which may be a vacuum. With the vibration of the surrounding medium, small bubbles formed by cavitation will move, grow up or suddenly disappear from time to time. The liquid around the disillusionment agent suddenly rushes into the bubble and produces high temperature, high pressure and shock wave. The internal friction with cavitation can form charge and generate light in the bubble due to discharge. The stopping technology of liquid ultrasonic treatment is mainly related to cavitation.

Heat effect

Ultrasonic has high frequency and high energy. When it is absorbed by medium, it can produce obvious thermal effect.

Chemical reaction effect

The effect of ultrasound may cause some chemical reactions to attack or accelerate. For example, pure distilled water is treated by ultrasonic to produce hydrogen peroxide; Nitrous acid was produced by ultrasonic treatment; Discoloration or fading of Dye Aqueous Solution by ultrasonic treatment. The above phenomena usually occur simultaneously with cavitation. Ultrasound can also accelerate the hydrolysis, synthesis, polymerization and other chemical processes. The effect of ultrasound on photochemistry and electrochemistry is also obvious. After ultrasonic treatment, the characteristic absorption bands of amino acids and other organic substances in aqueous solution disappear, showing average common absorption, which indicates that the molecular structure has changed.

Vertical heater

Device principle

The plastic component to be fused is heated at the interface of the joint to be fused with a metal sheet higher than the melting point of the plastic material to melt the interface of the plastic component. After the plastic joint is melted, the hot metal plate is moved away, and the upper and lower plastic parts are pressurized to fuse the joint.

Device characteristics.

The utility model has the advantages of simple structure, convenient operation and high power consumption efficiency. It is suitable for welding thermoplastic products of various shapes, sizes and materials. The process is widely used, economic and practical, high consumption efficiency, and has a certain promotion value. According to the process characteristics, consumption efficiency and automation level of various plastic parts, users can choose one machine multi-mode welding process. In one welding process, several plastic parts can be welded at the same time, or they can choose the multi worktable hot plate welding machine with higher automation level to realize the termination of multi position welding. It can also use the special multi plate welding machine for multi welding surface to complete all the process requirements at one time.

Scope of application

Automotive Industry: bumper, instrument panel, fuel tank, cylinder head, front and rear combination lamp, heat grille, ventilation pipe, sun visor, etc. Other: steam iron, washing machine, vacuum cleaner, floating ball, large ceiling board and other large irregular, water tight, air tight, high strength plastic parts. It is suitable for welding of lamp, balance ring of washing machine, storage battery, steam iron, automobile water tank and other large irregular plastics.