As is well known, the sound that people hear is a sound wave signal with a frequency of 20Hz~20000Hz, and the sound waves above 20000Hz are called ultrasonic waves. The transmission of sound waves follows a sine curve longitudinal propagation, that is, one layer strong and one layer weak, transmitted in sequence. When a weak sound wave signal acts on a liquid, it will generate a certain negative pressure on the liquid, causing many small bubbles to form inside the liquid. When a strong sound wave signal acts on a liquid, it will generate a certain positive pressure on the liquid, thus crushing the small bubbles formed in the liquid. It has been proven through research that when ultrasound is applied to a liquid, the rupture of each bubble in the liquid produces the strongest shock wave, equivalent to instantaneous high temperature and up to thousands of atmospheres of pressure. This phenomenon is called the "cavitation effect", and ultrasonic cleaning is the use of the shock wave generated by the rupture of bubbles in the liquid to achieve the purpose of cleaning and flushing the inner and outer surfaces of the workpiece.
Ultrasonic waves can be divided into three types, namely infrasound waves, sound waves, and ultrasonic waves. The frequency of infrasound waves is below 20Hz, the frequency of sound waves is between 20Hz and 20kHz, and the frequency of ultrasonic waves is above 20kHz. Among them, infrasound waves and ultrasonic waves are generally inaudible to the human ear. Due to its high frequency and short wavelength, ultrasonic waves have good directionality and strong penetration ability.
The principle of ultrasonic cleaning machine is mainly to convert the sound energy of the power ultrasonic frequency source into mechanical vibration through the transducer, and to radiate the cleaning solution in the tank to ultrasonic waves through the cleaning tank wall. Due to the radiation of ultrasonic waves, microbubbles in the liquid inside the tank can maintain vibration under the action of sound waves.
When the sound pressure or intensity reaches a certain level of pressure, bubbles will rapidly expand and then suddenly close. During this process, a shock wave is generated at the moment when the bubble closes, causing a pressure of 1012 Pa to 1013 Pa around the bubble. The enormous pressure generated by ultrasonic vaporization can destroy insoluble pollutants and cause them to differentiate into the solution.
On the one hand, ultrasound destroys the adsorption between dirt and the surface of the cleaning part, and on the other hand, it can cause fatigue damage and detachment of the dirt layer. The vibration of gas bubbles cleans the solid surface. Once there is a gap in the dirt layer that can be drilled, the bubbles immediately "drill in" and vibrate to make the dirt layer fall off. Due to cavitation, the two liquids quickly disperse and emulsify at the interface. When solid particles are wrapped in oil and adhere to the surface of the cleaning part, the oil is emulsified and the solid particles fall off on their own. When ultrasound propagates in the cleaning solution, it generates positive and negative alternating sound pressure, forming a jet that impacts the cleaning part. At the same time, due to nonlinear effects, it produces sound flow and micro sound flow. Ultrasonic cavitation produces high-speed micro jet at the interface between solid and liquid. All of these functions can destroy pollutants, remove or weaken boundary pollution layers, increase stirring and diffusion effects, Accelerate the dissolution of soluble pollutants and enhance the cleaning effect of chemical cleaning agents.
From this, it can be seen that wherever a liquid can penetrate and a sound field exists, there is a cleaning effect, which is suitable for cleaning parts with very complex surface shapes. Especially after adopting this technology, the amount of chemical solvents used can be reduced, greatly reducing environmental pollution.
超聲波清洗機使用注意事項
Precautions for using ultrasonic cleaning machine
1、超聲波淸洗機電源及電熱器電源必須有良好接地裝置。
1. The power supply of ultrasonic cleaning machine and electric heater must have a good grounding device.
2、超聲波清洗機嚴禁無清洗液開機,即清洗缸沒有加一定數量的淸洗液,不得合超聲波開關。
2. It is strictly prohibited to start the ultrasonic cleaning machine without cleaning solution, that is, if the cleaning tank has not been filled with a certain amount of cleaning solution, the ultrasonic switch must not be turned on.
3、有加熱設備的淸洗設備嚴禁無液時打開加熱開關。
3. Cleaning equipment with heating devices is strictly prohibited from turning on the heating switch when there is no liquid.
4、禁止用重物(鐵件)撞擊淸洗缸缸底,以免能童轉換器晶片受損。
4. Do not hit the bottom of the cleaning tank with heavy objects (iron parts) to prevent damage to the converter chip.
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