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Basic parameters of ultrasonic cleaning machine

Ultrasonic cleaning is based on cavitation, so many bubbles in the cleaning solution are generated quickly and implode immediately. This impact will make the waste on the inner and outer surfaces of the workpiece soaked in the cleaning solution fall off. With the increase of ultrasonic frequency, the number of bubbles increases and the blasting impact becomes weaker. Therefore, high-frequency ultrasound is especially suitable for cleaning particle stains without damaging the surface of its workpiece. All ultrasonic cleaning systems need to have three basic components: a water tank for storing cleaning liquid, a transducer for converting electric energy into mechanical energy and an ultrasonic generator for generating high-frequency electrical signals.

(1) Frequency: ≥20KHz, divided into three types: low frequency, intermediate frequency and high frequency.

(2) Cleaning medium: ultrasonic cleaning, generally two kinds of cleaning agents: chemicals, water-based cleaning solution, etc. The chemical action of cleaning medium can accelerate the efficiency of ultrasonic cleaning. Ultrasonic cleaning is a physical action, and the two actions are combined to thoroughly clean articles.

(3) Power density: power density = emission power (W)/ emission area (cm2) is generally ≥0.3W/cm2. The higher the power density of ultrasonic wave, the stronger the cavitation effect, the faster the speed and the better the cleaning effect. However, for precision articles with high surface finish, long-term high power density cleaning will cause "cavitation" corrosion on the surface of the articles.

(4) Ultrasonic frequency: The lower the ultrasonic frequency, the easier it is to generate cavitation in the liquid. The greater the intensity, the stronger the effect, which is mainly used for cleaning the workpiece (rough and dirty). If the frequency is high and the ultrasonic wave has strong directivity, it is mainly used for the meticulous cleaning of articles.

(5) Cleaning temperature: In general, the space-time effect of ultra-basic sound wave is the best at 30℃-40℃. The higher the temperature of the detergent, the more obvious the effect. In general, the working temperature of ultrasonic is 50℃-70℃.

Specification for use of ultrasonic cleaning machine:

(1) The power supply of ultrasonic cleaning machine and electric heater must have a good grounding protection device.

(2) Do not start the ultrasonic switch when a certain amount of cleaning liquid is not added to the cleaning cylinder of the ultrasonic cleaning machine.

(3) Cleaning equipment with heating equipment is forbidden to turn on the heating switch when there is no liquid.

(4) It is forbidden to hit and clean the bottom of the cylinder with heavy objects (iron pieces) to prevent the transducer chip from being damaged.

(5) The power supply of the ultrasonic generator should only use a 220V/50Hz power supply, and be equipped with a voltage regulator above 2000W W. ..

(6) The bottom of the cleaning cylinder should be cleaned frequently, without too many impurities or stains.

(7) Every time a new liquid is replaced, the parts can be cleaned after the ultrasonic wave is started.

Selection of cleaning agent for ultrasonic cleaning machine;

When discussing the preparation of ultrasonic cleaning agent, the most important thing is to think about the cleaning principle and cleaning process of cleaning agent for dirt. Although washing has a long history, due to the complexity of the washing process and system, the theoretical circle has only explored it in essence so far, and it is difficult to control the washing process with data. Mainly because the solution system is a heterogeneous dispersion system. The dispersion medium is also a complex solution with various components: the surfaces and interfaces involved in the system and the nature of their stains are extremely complex.

The detergents used in ultrasonic cleaning machines are mostly liquid detergents, which are composed of surfactants, additives and other additives. When a substance is dissolved in water, even in a small concentration, it can obviously reduce the surface tension between water and air, or the interfacial tension between water and other substances. This substance is called surfactant. Surfactants can be divided into anionic, cationic, neutral and amphoteric surfactants according to the electrical properties of hydrophilic groups when they are dissolved in water.

The addition of auxiliaries will play the following roles: 1. Buffering effect: keep the PH value of detergent stable. 2. Corrosion resistance to metals. 3. It can increase the emulsifying ability and emulsifying stability of detergent. 4. It can make the solution have good suspension ability and the ability to stabilize the suspension system, and can prevent the stains from settling again. Selection principle of surfactant, chelating agent and auxiliary agent: (1) detergent has strong cleaning ability; (2) the chemical property is soft and does not damage clothes; (3) There is no chemical interaction between the two components, so the components are invalid; (4) It has good bleaching performance. The use temperature and concentration of the prepared washing liquid should be determined through specific experiments. The role of solvent-based cleaning agent is to achieve the purpose of cleaning by dissolving the glue, wax and asphalt on it. Therefore, in ultrasonic cleaning, it is necessary to choose a suitable cleaning agent according to the characteristics of dirt in the cleaning object, and only by choosing a suitable cleaning agent can a satisfactory cleaning effect be achieved.

Other applications of ultrasonic cleaning machine

Besides cleaning, ultrasonic cleaning machine can also be widely used for degassing, defoaming, emulsification, mixing, replacement, extraction, powder crushing and cell crushing. Among them, liquid degassing has become one of the main applications of ultrasonic cleaning machine besides cleaning and one of the necessary tools for liquid instruments.

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