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Ultrasonic cleaning machine-related cleaning agent selection method?

Date: 2022-10-26Number: 211

Common types of ultrasonic cleaning machines:

Table top ultrasonic cleaning machine, ultrasonic pipette cleaning machine, single-trough ultrasonic cleaning equipment, ultrasonic pipette cleaning machine, high-power ultrasonic cleaning machine, ultrasonic cylinder parts cleaning machine, ultrasonic reed washer, ultrasonic dishwasher, immersion ultrasonic washer, ultrasonic titanium rod washer, ultrasonic core washer, ultrasonic aluminum barrel washer, ultrasonic cake washer, digital ultrasonic cleaning machine, ultrasonic cleaning machine, high-power ultrasonic cleaning machine, ultrasonic cleaning line, automatic ultrasonic cleaning machine, ultrasonic cleaning machine, double-slot ultrasonic cleaning machine, multi-slot ultrasonic cleaning machine, ultrasonic photoelectric glass cleaning machine, medical ultrasonic cleaning machine, etc. .

ultrasonic cleaning machines

The basic parameters of ultrasonic cleaning machine

Ultrasonic cleaning is based on cavitation, then many bubbles in the cleaning fluid rapidly generated and immediately imploded. The impact will be immersed in the cleaning fluid of the workpiece inside and outside the surface of the waste off. With the increase of ultrasonic frequency, the number of bubbles increases and the burst force weakens. Therefore, high-frequency ultrasound is especially suitable for cleaning the particle stain without damaging the surface of the workpiece. All ultrasonic cleaning systems require three basic components: a tank for the cleaning fluid, a transducer that converts electrical energy into mechanical energy, and an ultrasonic generator that generates high-frequency electrical signals.

(1) frequency: ≥20KHz, can be divided into low frequency, intermediate frequency, high frequency 3 kinds.

(2) cleaning medium: ultrasonic cleaning, general two types of cleaning agents: chemicals, water-based cleaning fluid. The chemical action of cleaning medium can speed up the effect of ultrasonic cleaning, ultrasonic cleaning is a physical effect, the combination of the two effects, and then carry out in-depth, complete and thorough cleaning of items.

(3) power density: power density = emission power (W)/emission area (CM2) generally ≥0.3 w/CM2, the higher the power density of ultrasound, the stronger the cavitation effect, the faster the speed, the better the cleaning effect. However, for precision, high surface smoothness of the goods, the use of long-term high-power density cleaning will cause the surface of the goods“Cavitation” corrosion.

(4) ultrasonic frequency: the lower the ultrasonic frequency is, the easier the cavitation in the liquid is, and the greater the force is, the stronger the effect is, and it is mainly used for cleaning the workpiece (coarse, dirty) . High frequency ultrasonic direction is strong, mainly used for careful cleaning of items.

(5) cleaning temperature: under normal circumstances, the best cavitation effect is obtained when the ultrasonic wave is over 30 ° C-40 ° C. Cleanser is high temperature, the more obvious the effect. The operating temperature of ultrasonic wave is 50 ° C-70 ° C.

Specification for use of ultrasonic cleaning machines:

(1) the power supply of ultrasonic cleaner and electric heater must have excellent earthing protection device.

(2) the ultrasonic switch can not be started without adding a certain amount of cleaning fluid to the cleaning cylinder of the ultrasonic cleaner.

(3) it is forbidden to open the heating switch when there is no liquid in the cleaning equipment with heating equipment.

(4) it is forbidden to wash the bottom of the cylinder with heavy objects (iron parts) to prevent the chip of the energy converter from being damaged.

(5) the power supply of ultrasonic generator should use only one 220V/50Hz power supply and install more than 2000W voltage regulator.

(6) the bottom of the cylinder should be cleaned frequently without excessive impurities or stains.

(7) after the ultrasonic wave is started, the parts can be cleaned every time the liquid is renewed.

Selection of cleaning agents for ultrasonic cleaning machines:

In the discussion of the preparation of ultrasonic cleaning agents, the most important thing is to remember the cleaning agent on the dirt cleaning principle and cleaning process. Although the history of scrubbing is long, the theory circle has only studied it in essence, but it is difficult to control the scrubbing process because of the complexity of scrubbing process and system. The main reason is that the solution system is a multiphase dispersion system. Dispersion media are also complex solutions with a wide variety of components: the surface and interface involved in the system, and the nature of its stains are extremely complex.

The cleaning agents used in ultrasonic cleaning machine are mostly liquid detergents, which are composed of superactive agent, superfluous mixture and other additives. A substance is called Surfactant when it can significantly reduce the surface tension between water and air, or the interfacial tension between water and other substances, even at very low concentrations. Depending on the electrical properties of the hydrophilic groups when Surfactant are dissolved in water, they can be classified as anionic, cationic, neutral and amphoteric.

The addition of some additives, and then play the following role: 1, buffer role: so that the PH of detergent can maintain stability. 2. Corrosion resistance to metals. 3. It can increase the emulsifying ability and emulsifying stability of detergent. 4, can let the solution has the very good suspension ability and the stable suspension system ability, can prevent the stain to settle again. The selection principle of epi-active agents, chelating agents and auxiliaries is: (1) the detergent composed of the detergent has strong cleaning ability, (2) the chemical property is gentle and does not harm the washed object; (3) there was no chemical interaction between the two components and the components failed. (4) the components had good bleaching property. The temperature and concentration of the washing liquid should be determined by the specific experiment. The role of solvent-based cleaning agent is through the rubber, wax, asphalt on the dissolution of the role to achieve cleaning purposes. Therefore, in the ultrasonic cleaning needs to be based on the characteristics of cleaning objects dirt, select the appropriate detergent, only select the appropriate detergent to achieve a satisfactory cleaning effect.

Other applications of ultrasonic cleaning machines

In addition to cleaning, the ultrasonic cleaning machine can be widely used in degassing, defoaming, emulsifying, blending, replacement, extraction, pulverizing and cell crushing. Among them, liquid degassing has become one of the main applications of ultrasonic cleaning machine in addition to cleaning, has become one of the essential tools of liquid-phase instruments.