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Knowledge About Ultrasonic Cleaner

What is ultrasonic cleaner

Ultrasonic waves spread in the liquid, causing the liquid to vibrate together with the cleaning tank at the ultrasonic frequency. When the liquid and the cleaning tank vibrate, they have their own natural frequencies. This vibration frequency is the acoustic frequency, so people hear the humming sound. With the continuous development of the cleaning industry, more and more industries and enterprises have applied ultrasonic cleaning machines.

Features for Ultrasonic Cleaning

The cleaning effect is good, the cleanliness is high and the cleanliness of all the workpiece is consistent. The cleaning speed is fast, the production efficiency is improved, and the cleaning liquid is not required to be touched by human hands, which is safe and reliable. Deep holes, slits and hidden parts of the workpiece can also be cleaned. No damage to the surface of the workpiece, saving solution, heat, work space and labor.

Ultrasonic cleaning are better than conventional cleaning methods, especially when the surface of the workpiece is complex, such as some surface irregularities, mechanical parts with blind holes, some products that are particularly small and have high requirements for cleanliness such as watches and clocks. Precision mechanical parts, electronic components, circuit board components, etc., can achieve excellent results by ultrasonic cleaning.

Principle of Ultrasonic Cleaning

The principle of ultrasonic cleaning machine is the high-frequency oscillating signal emitted by the ultrasonic generator, which is converted into high-frequency mechanical oscillation by the transducer and spreads to the medium--cleaning solution. The ultrasonic wave is radiated in the cleaning liquid in a dense phase to make the liquid generate tens of thousands of tiny bubbles with a diameter of 50-500μm, and the tiny bubbles existing in the liquid vibrate under the action of the sound field. These bubbles form and grow in the negative pressure region in which the ultrasonic waves spread longitudinally, and in the positive pressure region, when the sound pressure reaches a certain value, the bubbles rapidly increase and then suddenly close. And when the bubble is closed, a shock wave is generated, thousands of atmospheric pressures are generated around it, and the insoluble dirt is destroyed to disperse them in the cleaning liquid. When the group particles are wrapped by the oil and adhere to the surface of the cleaning member, the oil is emulsified, and the solid is solid. Particles and detachment, so as to achieve the purpose of cleaning the cleaning parts. In this process known as the "cavitation" effect, the bubble closure can form a high temperature of several hundred degrees and an instantaneous high pressure of more than 1000 atmospheres.

The Advantages of Ultrasonic Cleaning

The ultrasonic cleaning effect is good, and the operation is simple. The sound that people hear is an acoustic signal with a frequency of 20-20000 Hz. The sound wave higher than 20000 Hz is called ultrasonic wave, and the transmission of sound wave spreads longitudinally according to the sinusoidal curve, generating a large number of small bubbles. One reason is that a tensile stress is locally generated in the liquid to form a negative pressure. The decrease in pressure causes the gas originally dissolved in the liquid to be supersaturated, and escapes from the liquid to become small bubbles; another reason is that the strong tensile stress tears the liquid apart to become a hollow, called cavitation.

Applications for Ultrasonic Cleaning

Ultrasonic cleaning machines are widely used in surface coating processing industry, machinery industry, electronics industry, medical industry, semiconductor industry, watch and jewelry industry, optical industry, textile printing and dyeing industry. Other industries, etc., the use of ultrasonic cleaning machine is as follows


1. Aerospace, aviation - cleaning precision parts. Electronic circuit boards, aircraft wheels, brake systems, air   

    conditioning heat exchangers, bearings, various metal parts.

2. Railway - various gate valves, brake valves, shock absorbers, bearing sets, passenger cars, refrigerated truck 

     refrigeration system condensers, radiators, locomotive internal combustion engine zeros, components, electrical 

     zeros, components.

3. Automobile, motorcycle manufacturing - cylinder block, cover, steering mechanism, shock absorbers and various 

    machined parts, chassis, wheel de-oiling, derusting, descaling before electrophoresis.

4. Liquid crystal (LCD) manufacturing - LCD substrate before ITO film cleaning, LCD substrate etching, liquid crystal 

    front, and subsequent process cleaning.

5.Optical components - camera lens, microscope, telescope, glasses, watch glass, optical lens after grinding, 

    cleaning before coating.

6.Containers - a variety of oral liquid containers, food glass metal containers, cosmetic containers, packaging 

    containers, dental appliances cleaning, inspection board.

7.Medical equipment - endoscopes, surgical instruments, syringes, test tubes, biochemical test containers, glass of 

    blood, tissue fluid, dirt cleaning.

8.The effective ingredient extraction of Chinese herbal medicine - replace the traditional high-temperature boiled 

    extraction process, efficient and protect the active ingredients.

9.Electronic manufacturing, communications, computers - SMT patch, PCB soldering flux, impurity cleaning.

10.Microelectronics - single crystal silicon wafers, process cleaning of integrated circuit manufacturing.

1. Application in the pharmaceutical industry

Ultrasonic cleaning technology has been widely used in many pharmaceutical companies, especially for the cleaning of vials, oral liquid bottles, ampoules, large infusion bottles, and cleaning of butyl rubber stoppers and natural rubber stoppers. For the cleaning of bottles, ultrasonic cleaning technology is used to replace the original brushing machine, which is realized by the processes of inverted water injection, ultrasonic cleaning, internal and external washing, air drying, and turning.

2. Application in micro-powder industry

It is well known that to obtain particles of different sizes, the crushed material is ground in a ball mill and sieved through layers of different specifications. After the sieve is used for a long time, the sieve hole will be blocked (such as diamond sieve). Brushing by other methods will destroy the sieve, and the effect is not satisfactory. After many manufacturers' tests, ultrasonic cleaning will not damage the sieve but also the particles are completely recycled

3. Application in the service industry.

In daily production, glasses and jewelry can be cleaned with ultrasonic waves. It is fast and harmless. Large hotels and restaurants use it to clean tableware. It not only has good cleaning effect, but also has the effect of killing viruses.

4, Application in cleaning filter

We know that no matter what kind of filter or filter of any kind, after a period time of use, the permeability will be reduced due to impurities, and the average filter price is lower, but for the chemical fiber industry, Only the imported filter element, the price is nearly 10,000 yuan, it is a pity to abandon it. The ultrasonic filter cleaning machine developed by us in cooperation with other scientific research units uses a concentrating ultrasonic cleaning machine, which can concentrate the energy above 1KW on the radiation surface of 200×20mm2. The ultrasonic intensity is high, the plug can be quickly removed, and the equipment is equipped with a reverse filter. As long as you provide the core, CLEAR ULTRASONIC branded ultrasonic cleaner can provide you with a complete cleaning device. (The equipment takes 10-15 minutes to wash a filter element). Applicable to PP cotton filter, activated carbon filter, hollow fiber filter ceramic membrane filter.

5.Application in cleaning metal

It is well known that after the metal bar is extruded into a wire, the outer part of the wire often has a layer of carbonized film and oil. It is difficult to remove the dirt (especially the whole wire) by acid cleaning or other cleaning methods. The ultrasonic wire washing machine is According to the actual production needs, a continuous wire-cutting and high-efficiency cleaning equipment is used. The rough washing part is composed of a cleaning liquid storage tank, a transducer, a circulation pump, a filter and a matching piping system. After the wire is ultrasonically washed and washed, and then blow dry to complete the entire cleaning process. The whole set of equipment integrated control is simple, convenient and effective. It is widely used in other wires such as silk, tungsten wire, molybdenum wire, silk wire and copper wire (before insulation coating).

6. Application in phosphating

The pre-spraying process of the product is very important. The general traditional process uses acid to treat the workpiece, which has serious environmental pollution and poor working environment. At the same time, the biggest drawback is that the residual acid after pickling and rust removal of complex structural parts is difficult to rinse well. After the workpiece is sprayed, the time is not long, and rusting occurs along the crack, which damages the surface of the coating and seriously affects the appearance and internal quality of the product. Ultrasonic cleaning technology is applied to the pre-painting treatment, which not only can quickly peel off the dirt on the surface and the gap of the object, but also the coating layer of the coating is firm and does not return to rust.

Power Selection

Ultrasonic cleaning is not necessarily proportional to (power x cleaning time), sometimes with low power, and it takes a long time to remove dirt. And if the power reaches a certain value, the dirt is sometimes removed quickly. If the power is too large, the cavitation intensity will be greatly increased, and the cleaning effect will be improved. However, the more precise parts will also have an etch point, which is not worth the loss, and the cavitation at the bottom of the cleaning cylinder is severe, and the water point corrosion is also increased. When using organic solvents such as trichloroethylene, there is basically no problem, but when using water or water-soluble cleaning solution, it is easy to be affected by water spots. If the surface of the vibrating plate has been scratched, cavitation corrosion occurs under the high power. Severe, so,choose the ultrasound power according to the actual use.

Frequency Selection

In the case of low frequencies, the time during which the liquid is pressed and pulled becomes longer, therefore, the cavitation is generated for a longer period of time and the volume is also longer, and the impact force generated when cavitation is closed is proportional to the size of the cavitation bubble. So the lower the frequency, the stronger the cavitation.

The frequency we use in industrial cleaning is generally less than 60KHz, and the most used is between 20 and 40KHz. With a frequency of around 20 kHz, a relatively small number of cavitation bubbles can be obtained, but with large cavitation intensity and noise, it can be used to clean workpieces with high bonding strength between the surface of large parts and the surface of objects. At a frequency of about 40KHz, the number of cavitation bubbles generated under the same sound pressure is large, but the cavitation intensity generated during the crushing is low, the noise is small, the penetrating ability is strong, and the surface is complicated, blind holes, dirt and a workpiece with a weak surface bond.