Piezo Ceramic Disc For Ultrasonic Cleaning 50mm 45KHz 35W

Piezo Ceramic Disc For Ultrasonic Cleaning 50mm 45KHz 35W

 

In the current tide of market economy, the application range of ultrasonic cleaning machines is becoming wider and wider, and they are playing an increasingly important role in people’s normal work and life! Various manufacturers have stricter and stricter requirements on the quality of their products, and higher and higher requirements on product quality. In order to ensure the quality of their products, all manufacturers are now paying more and more attention to ultrasonic cleaning machines. The problem of manual cleaning cannot be solved by handing it to the ultrasonic cleaning machine.

 

Where the ultrasonic cleaner is used: for example, it can be used to clean clock parts, optical glasses, microscope lenses, engine parts, crankshafts, cylinder blocks, cylinder heads, crankshafts, connecting rods, reduction gearboxes, clutches, precision bearing parts, gears, Piston rings, knives, saw blades, jewelry, medical syringes, medical medicine bottles, aluminum caps, aluminum-plastic caps, laboratory glassware, etc.; it can also be used to clean PCBA boards, SMT patches, semiconductor wafers, and kinescopes Precision parts, ceramic components, silicon wafers, ceramic wafers, welding wires, and other products.

 

Classification of ultrasonic cleaning methods:

 

The cleaning of a workpiece can be divided into two methods: physical and chemical. For example, it can be cleaned by physical force, such as washing the dirt on the clothes with hands back and forth, such as washing the surface of the workpiece with a high-pressure water gun. These are all physical. Powerful cleaning. There are also chemical cleaning methods, such as the corresponding chemical reaction between washing powder and clothing dirt. When cleaning rust, use acid treatment. These are all chemical cleaning methods. Ultrasonic cleaning with tap water or purified water as the cleaning fluid is a physical cleaning. If some detergent is added to the cleaning fluid, it belongs to combined cleaning. Different detergents are used for different cleaning objects, which has a more obvious cleaning effect. .

 

Table 1 compares the cleaning effects of several cleaning methods. The above data are all from authoritative department reports!

 

Introduction to the principle of ultrasonic cleaning:

One of the principle decryption: Put the cleaning solvent into the ultrasonic cleaning tank, and apply ultrasonic waves to the tank. Because ultrasonic waves are dense and dense vibration waves like sound waves, the pressure of the medium changes alternately. If you observe a certain point in the liquid, the pressure at this point is shown in curve A in the figure below.

 

 

With static pressure (generally one atmosphere) as the center, the pressure increases and decreases. If the intensity of the ultrasound is sequentially increased, the pressure amplitude will also increase, as shown in the curve B in Figure 2. The oscillating signal with a frequency higher than 20KHz is amplified by the ultrasonic generator and converted into high-frequency mechanical vibration energy by the inverse piezoelectric effect of the ultrasonic transducer (vibration head). The sound radiation in the cleaning medium makes the cleaning liquid The molecules vibrate and produce countless tiny bubbles. Bubbles form and grow in the negative pressure zone along the ultrasonic propagation direction, and rapidly close in the positive pressure zone to produce thousands of atmospheres of instantaneous high pressure and blast, forming countless microscopic high-pressure shock waves that act on the surface of the workpiece to be cleaned. This is the “cavitation effect” in ultrasonic cleaning. Ultrasonic cleaners work based on the basic principle of “cavitation effect”.

 

The second principle of decryption: the reason for the peeling of dirt: because the ultrasonic cavitation bubble produces a strong shock wave when the bubble bursts, the dirt layer is peeled off under the action of the shock wave, that is, it is dispersed and peeled off. The bubbles shown in Figure a below are generated due to cavitation.

 

 

The gaps and voids between the dirt layer and the surface formed by the impact penetrate. Because this kind of small bubbles expand and contract in synchronization with the sound pressure, a physical force like peeling is generated. Repeated action is applied to the dirt layer, and the dirt is peeled off layer by layer. , As shown in Figure b below

 

 

The small bubbles continue to push forward until the dirt layer is peeled off. This is the secondary effect of cavitation.

The third deciphering principle: the force of the ultrasonic vibration of the cleaning liquid itself on the cleaning in the ultrasonic cleaning.

For example: 20kHz, 2w/cm2 ultrasonic waves propagate in the cleaning solution, it will cause the vibration of the particle, the speed is 0.16m/s, the acceleration is 2.04X104m/sz, and the sound pressure is 1.45X105Pa, which indicates that the surface of the cleaning object is The dirt layer will be violently impacted 20,000 times per second. This kind of high-intensity and high-frequency impact can hardly escape the violent “attack” of ultrasonic mechanical waves, even the tough dirt layer. To

 

Principle Four: The cleaning agent also dissolves dirt and produces emulsifying and dispersing chemical forces. The cleaning agent can chemically react with the dirt on the workpiece to be cleaned, and the dirt is quickly disintegrated under the violent attack of the ultrasonic wave. The main principle of ultrasonic cleaning is ultrasonic cavitation. To obtain a good cleaning effect, it is very important to reasonably select the acoustic parameters of the sound field in the cleaning tank and the physical and chemical properties of the cleaning liquid.

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