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1. According to Principle 16: Vibration design of ultrasonic cleaning equipment standard ultrasonic cleaning principle:
The ultrasonic cleaner amplifies the electric power of the oscillating signal with frequency higher than 20KHz through the ultrasonic generator.
After that, the inverse piezoelectric effect of the ultrasonic transducer (shock head) is converted into high frequency mechanical vibration energy, which vibrates the molecule of the cleaning solution and generates numerous tiny bubbles through the acoustic radiation in the cleaning medium. Bubbles form and grow in the negative pressure region along the direction of ultrasonic propagation, and in the positive pressure region.
The rapid closure of pressure zone produces thousands of atmospheric pressure instantaneous high pressure and explosion, forming numerous micro high pressure shock waves acting on the surface of the cleaned workpiece. This is the "cavitation effect" in ultrasonic cleaning. Ultrasound cleaning machine is based on the basic principle of "cavitation effect"
Therefore, ultrasonic cleaning has excellent cleaning ability for workpieces with complex internal and external structures, micro-uneven surfaces, slits, small holes, corners, dead corners, component-intensive features, which is incomparable with other cleaning methods. With the increase of ultrasonic frequency, the number of bubbles increases and the impact force of blasting decreases. Therefore, high frequency ultrasound is especially suitable for cleaning small particles of dirt without breaking the surface of the workpiece. 
The equipment consists of three parts:
Ultrasound generator (also known as ultrasonic power supply), transducer and other auxiliary systems.
Ultrasound generator converts power frequency into high frequency electric signal above 28KHZ, and transmits it to transducer through cable. Usually, the ultrasonic transducer is fixed on the bottom of the cleaning tank, which is filled with liquid. When the transducer is added with high frequency voltage, its piezoelectric ceramic components will produce longitudinal vibration under the action of electric field.
Ultrasound transducer (also known as sound head) is an efficient energy transducer, which can convert electrical energy into powerful ultrasonic vibration. When generating ultrasonic vibration, it is like a small piston with a small amplitude of only a few microns. But this vibration acceleration is very large (tens to thousands); there are many transducers on the slot. When applying the same frequency and phase power, a huge piston is synthesized for reciprocating vibration. This vibration phenomenon is what we usually call ultrasonic. The following are the components of the ultrasonic wave. (1) Transducer: Sandwich type vibration head composed of special lead zirconate titanate PZT piezoelectric ceramic sheet has the advantages of high efficiency, long service life and not easy to break down. The transducer is fixed by special high temperature resistant, vibration resistant, high viscosity resin gum and special method, and can withstand high temperature (2) ultrasonic generator (power supply) at 100 150 C. The transducer uses power MOS transistor ultrasonic generator with advanced circuit, complete structure and sensitive and reliable integrated control system, which ensures the stability of the ultrasonic cleaner under various loads. Do. The generator is compact in size, novel in appearance, and easy to operate. Its product quality and technical level are comparable to those of similar products abroad. Once it is launched, it has attracted the attention of the peers and is welcomed by the vast number of users.
All kinds of ultrasonic generators can work independently or in parallel to complete large-scale cleaning projects. Easy maintenance.
If one group fails, it will not affect the work of other groups, which is more important for the production line. The cabinet is equipped with cooling fans for forced cold air to ensure the safety of long-term work. (3) Heating and Temperature Control System: The heater adopts cast aluminium heating sheet, which can resist acid and alkali, and has long service life. The purpose of heating is to heat the cleaning agent to increase the washing effect of the cleaning machine. The temperature can be automatically controlled. The cleaning tank can be adjusted at will within an appropriate range. (4) The cleaning tank is made of SU304 stainless steel welded by argon arc welding, and the tank body is equipped with a slag discharge overhaul, insulation and sound insulation layer. 5) The tank liquid circulating filtration system is equipped with a filter to dynamically filter the tank liquid. Maintain the cleanliness of the tank fluid. When the workpiece is out of the groove, the filtered liquid flows through the spray links on the upper part of the groove body to wash the workpiece once in order to wash the workpiece out of the groove, so as to avoid contamination of the lower groove fluid. (6) Conveying system: According to the shape, volume and batch of the workpiece being cleaned, the conveying mode and control of the ultrasonic cleaning machine are determined.
Way. Typical conveying modes are catenary, mesh belt, double chain, stepping, electric hoist, self-propelled hoist, drum, turntable, etc.
Gantry frame, manipulator, hanging basket, push plate and so on. (7) Spray rinsing system: According to the surface condition of the cleaned workpiece, some cleaners are equipped with spray rinsing process, which organically combines ultrasonic cleaning and spray cleaning. (8) Drying system: According to the condition of the cleaned workpiece, some cleaners are equipped with drying system. The drying system is mainly composed of heaters, fans, blowing nozzles and other components. The temperature is automatically controlled.
The ultrasonic cleaning equipment is mainly composed of the following components:
Cleaning trough: Stainless steel for workpiece to be washed. Heating and temperature control devices can be installed.
The bottom of the cleaning tank is bonded with an ultrasonic transducer.
Transducer (Ultrasound Generator): Converting Electric Energy into Mechanical Energy
Piezoelectric ceramic transducer, frequency and power depend on the specific model.
Power supply: Provide the required power inverters for transducers, import IGBT components, install overcurrent protection lines.
3 Cleaning process
When the transducer converts the high-frequency electric energy into mechanical energy, it will produce high-frequency vibration with very small amplitude and propagate to the solution in the cleaning tank. Under the action of the transducer, a large number of tiny bubbles will be generated in the cleaning fluid and burst instantaneously. The breakdown of each bubble will produce shock waves of hundreds of degrees of high temperature and nearly 1000 atmospheric pressure, thus the workpiece will be washed clean.
Preparation of cleaning agent
The detergent used in ultrasonic cleaning machine is mostly liquid detergent, and its composition mode is surfactant, superfluous mixture and other detergents.
Auxiliaries, as well as other organic solvents such as trichloroethylene.
When a substance is dissolved in water, even at a very low concentration, it can significantly reduce the surface tension between water and air, or water and other substances.
The interfacial tension is called surfactant. The molecular structure of water-soluble surfactants is asymmetric and polar.
Adsorption on the interface between aqueous solution and other phases greatly changes the physical properties of the system, especially the interfacial tension of each phase.
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.
Chelating agent and some metal ions in solution, such as Ca2+, Mg2+, form stable chelates, so that detergent has the function of resisting hard water. When cleaning lens, it can also combine with some substances containing Ca2+, Mg2+ on lens surface to achieve cleaning effect.
4 Use related instructions
The addition of some additives can play the following roles:
Buffering effect: keep the PH value of detergent stable.
Corrosion resistance of metals.
It can increase the emulsifying ability and stability of detergent.
It can make the solution have good suspension ability and stability of suspension system, and prevent fouling from settling again.
The selection principles of surfactants, chelating agents and auxiliaries are as follows: (1) the detergent has strong cleaning ability; (2) the chemical property is soft and does not damage the washed product; (3) no chemical action occurs between the components to make the components invalid; (4) the detergent has good bleachability. The temperature and concentration of detergent preparation should be determined by specific experiments. The function of trichloroethylene is to clean it by dissolving glue, wax and asphalt.
5. Superiority of Ultrasound Cleaning
High Precision: Because the energy of ultrasonic wave can penetrate tiny cracks and holes, it can be used to clean any parts or assemblies. When the cleaned parts are precision parts or assemblies, ultrasonic cleaning is often the only one that can meet their special technical requirements.
Cleaning method;
Rapid: Compared with conventional cleaning methods, ultrasonic cleaning is much faster in dust removal and scale removal.
The assembly can be cleaned without disassembly. Ultrasound cleaning has the advantage of saving labor force, which often makes it the most economical cleaning method.
Consistency: Whether the cleaned parts are large or small, simple or complex, single or batch or on automatic assembly line, the use of ultrasonic cleaning can achieve an unparalleled uniform cleanliness of manual cleaning.
6 Product Example KQ400KDE Desktop High Power NC Ultrasound Cleaner
Technical Indicators:
Size: 320 264 380mm
Size of cleaning tank: 300 240 150 mm
Flume capacity: 10L
Ultrasound frequency: 40KHz
Ultrasound power: 400W power adjustable 40-100%
Influent level: 1-120 mm
Heating power: 600W
Temperature adjustable: 10-80 C
Adjustable time: 1-480 min
Dumping cap: Yes.
Intake and drainage: manual control
Shell: stainless steel
Usage: High-power NC ultrasonic cleaner with ultrasonic source and cleaning tank as one.
With high power ultrasonic transducer, high emission wavelength and strong ultrasonic impact, the stubborn dirt on the workpiece can be thoroughly cleaned and cleaned in all directions.
It is mainly applicable to industrial and mining enterprises, colleges and universities, scientific research units for ultrasonic liquid level, liquid temperature accuracy, ultrasonic frequency, ultrasonic time,
Ultrasound power and other high requirements, high cleanliness, high precision cleaning, degassing, defoaming, emulsification, mixing, rotation, extraction and cell crushing. It is the best choice for users.
Main properties and characteristics:
Reasonable "Three Packages" of Digital Display Products
Accumulative working time of digital display to realize reasonable "three packages"
Digital Memory and Set Ultrasound Working Time
Digital Memory and Setted Ultrasound Power
Digital Display Memory and Setted Influent Level
Actual liquid level in digital display container
Digital Display Memory and Setting Heating Temperature in Container
Digital Display Recording of Actual Temperature in Container
Digital Overtemperature, Overvoltage and Overcurrent Protection Indicators
Digital Low Water Level, No Solution Protection Instruction
Simultaneous Digital Display of Ultrasound Level, Solution Temperature, Ultrasound Time, Ultrasound Power
The cumulative working time of the instrument is 999999 hours.
The operation program of the instrument adopts the software of single chip computer.
KDV Series Cleaner with Volatile Water Vapor Automatic Recovery Device
KDV Series Cleaner with Sound Reduction and Heat Insulation Device
The transmitting power of each high power ultrasonic transducer of the cleaner is 100W.
Ultrasound frequencies are 20KHz, 25KHz, 28KHz, 40KHz, etc.
Argon welding forming of stainless steel mesh sieve for cleaner grids
High quality 304 stainless steel sheet stamping for inner groove of cleaner
High quality 304 stainless steel is used for the noise reduction cover and shell of the cleaner.
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