What are the following points should to pay attention to when buying an ultrasonic cleaning machine?

1. Power selection

Ultrasonic cleaning sometimes uses low power and takes a long time without removing dirt. If the power reaches a certain value, the dirt will be removed quickly. If the power is too large, the cavitation strength will be greatly increased, and the cleaning effect will be improved. However, at this time, the more precise parts will also produce corrosion spots. Moreover, the vibration plate at the bottom of the ultrasonic cleaning machine is seriously cavitation, and the water point corrosion will also increase. When using organic solvents such as trichloroethylene, there is basically no problem. However, when using water or water-soluble cleaning solution, it is easy to be subject to water point corrosion. If the surface of the vibration plate has been damaged, Cavitation and corrosion are more serious under high power, so ultrasonic power should be selected according to actual use.

2. Frequency selection

The ultrasonic cleaning frequency ranges from 28 kHz to 120 kHz. When water or water cleaning agent is used, the physical cleaning force caused by cavitation is obviously beneficial to the low frequency. Generally, about 28-40 kHz is used. For parts with small gaps, slits and deep holes, it is better to use high frequency (generally above 40KHz) or even several hundred kHz. When cleaning clock parts, use 100kHz. If you use broadband FM cleaning, the effect is better.

3. Use of cleaning basket

When cleaning small parts and articles, the net basket is often used. Because the mesh will cause ultrasonic attenuation, special attention should be paid. It is preferable to use a mesh of 10 mm or more when the frequency is 28 kHz.

4. Cleaning liquid temperature

The most suitable cleaning temperature of water cleaning liquid is 40-60 ℃, especially in cold weather, if the temperature of cleaning liquid is low and the cavitation effect is poor, the cleaning effect is also poor. Therefore, some ultrasonic cleaning machines wrap heating wires around the outside of the cleaning cylinder for temperature control. When the temperature rises, cavitation is easy to occur, so the cleaning effect is good. When the temperature continues to rise, the gas pressure in the cavity increases, causing the impact sound pressure to drop, and the effect will also weaken. The organic solvent cleaning liquid is cleaned at a temperature close to the boiling point.

5. Determination of the amount of cleaning liquid and the position of cleaning parts

Generally, it is preferable that the liquid level of the cleaning liquid is more than 100mm above the surface of the vibrator. Because the single frequency ultrasound cleaning machine is affected by the standing wave field, the amplitude at the wave node is very small, and the amplitude at the wave amplitude is large, resulting in uneven cleaning. Therefore, the best position for cleaning articles should be placed at the wave amplitude. (more effective range: 3-18 cm)