Use ultrasonic equipment correctly

1. Understand ultrasonic waves

Using ultrasonic waves can be divided into three types, namely infrasonic waves, acoustic waves and ultrasonic waves. The frequency of infrasound waves is below 20Hz; the frequency of sound waves is 20Hz-20kHz; the frequency of ultrasonic waves is above 20kHz. The infrasound and ultrasonic waves are generally inaudible to human ears. Due to its high frequency and short wavelength, ultrasonic waves have good propagation direction and strong penetration ability. This is why ultrasonic cleaning machines are designed and manufactured.

2. How does ultrasonic wave complete the cleaning work?

Ultrasonic cleaning uses the socialization effect, acceleration effect and direct flow effect of ultrasonic waves in the liquid to directly and indirectly clean the liquid and dirt. Function, the dirt layer is dispersed, emulsified and peeled off to achieve the purpose of cleaning. Among currently used ultrasonic cleaning machines, cavitation and direct flow are used more frequently.

(1) Cavitation: Cavitation is the transmission of ultrasonic waves into the liquid in the form of high-frequency interactive transformation of compression force and decompression pressure more than 20,000 times per second. When the pressure is reduced, the phenomenon of vacuum core bubbles is generated in the liquid. When the compression force is applied, the vacuum core bubbles generate a strong impact force when they are crushed by the pressure, thereby peeling off the dirt on the surface of the object to be cleaned, thereby achieving precision. Cleansing purposes.

(2) The effect of straight flow: The phenomenon that ultrasonic waves produce flow in the liquid along the direction of sound propagation is called straight flow. When the sound wave intensity is 0.5W/cm2, the straight flow can be seen with the naked eye, and the flow is generated perpendicular to the vibration surface. The flow rate is about 10cm/s. Through this straight flow, the slight oily dirt on the surface of the object to be cleaned is stirred, and the dirt surface The cleaning liquid also produces convection, and the dissolved liquid that dissolves the dirt is mixed with the new liquid, which accelerates the dissolution speed and plays a great role in the transportation of dirt.

(3) Acceleration: the acceleration generated by the push of liquid particles. For ultrasonic cleaning machines with higher frequencies, the cavitation effect is very insignificant. The cleaning at this time mainly relies on the acceleration of liquid particles under the action of ultrasound to impact particles to carry out ultra-precise cleaning of dirt.

3. What is the principle of ultrasonic cleaning machine

The ultrasonic transducer converts high-frequency oscillating electrical signals into high-frequency mechanical oscillations, which radiate in the cleaning fluid in the form of longitudinal waves. During the half-wave period of the expansion of the radiation wave, the density of the cleaning fluid is destroyed and countless bubbles with a diameter of 50-500 μm are formed. This bubble is filled with solution vapor. During the half-wave of compression, the bubbles close quickly, resulting in a local hydraulic impact of hundreds of MPa. This phenomenon is called the "cavitation" effect. Under the continuous action of the "cavitation" effect, the dirt on the surface or hidden areas of the workpiece is exploded and peeled off. At the same time, under the action of ultrasound, the penetration of the cleaning liquid is strengthened; the pulsating stirring is intensified; the dissolution, dispersion and emulsification are accelerated; thus the workpiece is thoroughly cleaned.

4. What parts does the ultrasonic cleaning machine consist of?

The ultrasonic cleaning machine mainly consists of an ultrasonic cleaning tank and an ultrasonic generator. The ultrasonic cleaning tank is made of high-quality stainless steel with strong elasticity and corrosion resistance. An ultrasonic transducer vibrator is installed at the bottom. The ultrasonic generator generates high frequency and high voltage, which is transmitted to the transducer through the cable connection line. The transducer and the vibration plate are together High-frequency vibration is generated, so that the solvent in the cleaning tank is affected by ultrasonic waves to clean dirt.

5. What are the characteristics of ultrasonic cleaning machine

Compared with various chemical, physical, electrochemical and physical and chemical cleaning methods, ultrasonic cleaning has the following unique advantages:

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·Can quickly and thoroughly remove all kinds of dirt on the surface of the workpiece.

·Can clean precision parts with complex shapes such as cavities and grooves.

·No damage to the surface of the workpiece.

·A variety of cleaning agents can be used.

·Cleaning can be done at room temperature or with appropriate heating (around 60°C).

·The integrated structure of the whole machine makes it easy to move.

·Save solvents, cleaning paper, energy, work space and labor.

6. How to use the ultrasonic cleaning machine

The use of the ultrasonic cleaning machine should be carried out in strict accordance with the following requirements.

(1) Connect the cable between the cleaning tank and the generator;

(2) Pour the cleaning fluid into the cleaning tank (the amount of cleaning fluid poured is When entering the object to be cleaned, the liquid level should be approximately three-quarters of the way across the entire surface);

(3) Put the object to be cleaned into the cleaning tank;

(4 ) Plug in the power plug;

(5) Set the cleaning time and turn on the machine.

7. What issues should be paid attention to when using an ultrasonic cleaning machine

1. The power supply of the ultrasonic cleaning machine and the electric heater power supply must have good grounding devices.

2. It is strictly forbidden to start the ultrasonic cleaning machine without cleaning fluid, that is, the ultrasonic switch must not be turned on without adding a certain amount of cleaning fluid to the cleaning tank.

3. For cleaning equipment with heating equipment, it is strictly forbidden to turn on the heating switch when there is no liquid.

4. It is prohibited to hit the bottom of the cleaning tank with heavy objects (iron parts) to avoid damage to the energy converter chip.

5. The ultrasonic generator power supply should use a separate 220V/50Hz power supply and be equipped with a voltage regulator of more than 2000W.

6. The bottom of the cleaning tank should be flushed regularly to avoid excessive debris or dirt.

7. Every time you change the liquid, wait until the ultrasonic wave is started before washing the parts.

8. The best way to achieve the best ultrasonic cleaning effect

(1) The temperature of the ultrasonic cleaning tank is best 30-50℃.

(2) Choose the correct cleaning agent according to different cleaning objects. Cleaning agents are generally divided into water-based (alkaline) cleaning agents, organic solvent cleaning agents and chemical reaction cleaning agents. Water-based cleaners are usually used the most.

(3) Choose different cleaning times according to the degree of contamination of the object to be cleaned and the nature of the dirt.

9. Tips for saving cleaning fluid

The cleaning fluid of the ultrasonic cleaning machine can be recycled. This cleaning method can save a lot of cleaning fluid. After each use of the cleaning machine , it is best to put the cleaning fluid into a container and pour it into the cleaning tank the next time you use it. The remaining sediment can be disposed of. If the concentration of the cleaning solution is not enough, add an appropriate amount and it can be reused.