Ultrasonic cleaning is conducted in liquids with fluctuations above the human auditory sound. When the sound waves propagate in the detergent, the sound waves are a kind of longitudinal waves, and the action of the longitudinal waves pushes the medium to cause a change in the pressure in the liquid. A tiny vacuum bubble is called a "hole effect." Fried Food is one of the traditional foods in our country, whether it is fried rice, fried spring rolls, croquettes, or fried dough sticks, oil cakes, noodles, and French fries in children's favorite snacks. Fried bread, fried chicken wings, and fried potato chips and fried biscuits in snacks are all fried foods. Fried Food Bean Paste,Fried Peanuts,Original Melon Seeds,Pecan Flavored Melon Seeds Hangzhou Aiyomi food co.,LTD , https://www.aiyomisnacks.com Introduction to the principle of ultrasound
When the bubble is pressed and blasted, it will generate strong impulse energy, which can disperse the dirt fixed in the dead angle of the object and enhance the cleaning effect of the cleaning. Because the ultrasonic frequency is high and the wavelength is short, the penetrating power is strong, so Washings with concealed slits or complex structures can achieve amazing cleaning results. Ultrasonic cleaning is based on cavitation, that is, numerous bubbles are rapidly formed in the cleaning solution and quickly imploded. The resulting impact peels off the dirt on the inner and outer surfaces of the workpiece immersed in the cleaning liquid. As the ultrasonic frequency increases, the number of bubbles increases and the blasting impact is weakened. Therefore, high-frequency ultrasound is particularly suitable for cleaning small particles without damaging the surface of the workpiece. The expansion of cavitation bubbles and burst (implosion) bubbles are generated by applying high frequency (ultrasonic frequency), high intensity sound waves to the liquid. Therefore, any ultrasonic cleaning system must have three basic components: a tank for holding the cleaning fluid, a transducer for converting electrical energy into mechanical energy, and an ultrasonic generator for generating high-frequency electrical signals. The important part of the transducer and generator ultrasonic cleaning system is the transducer. There are two types of transducers, one is a magnetic transducer made of nickel or a nickel alloy; and the other is a piezoelectric transducer made of lead zirconate titanate or other ceramics. When a piezoelectric material is placed in an electric field of varying voltage, it deforms. This is called the 'piezoelectric effect'. Relatively speaking, magnetic transducers are made of materials that deform in a changing magnetic field. Regardless of the transducer used, the basic factor of Zui is usually the strength of the cavitation effect it produces. Ultrasound, like other sound waves, is a series of pressure points, an alternating wave of compression and expansion (as shown below). If the sound energy is strong enough, the liquid is pushed away during the expansion phase of the wave, thereby generating bubbles; and during the compression phase of the wave, these bubbles burst or impinge instantaneously in the liquid, producing a very effective impact force, especially Suitable for cleaning. This process is called cavitation. The compression and expansion of sound waves are theoretically analyzed. The bursting cavitation bubbles will generate pressures in excess of 10,000 psi and temperatures of 20,000 °F (11,000 °C), and the shock waves will radiate outward rapidly at the moment of bursting. The energy released by a single cavitation bubble is small, but there are millions of cavitation bubbles bursting at the same time every second. The cumulative effect will be very strong, and the powerful impact will peel off the surface of the workpiece. This is the hallmark of all ultrasonic cleaning. If the ultrasonic energy is large enough, cavitation will occur throughout the cleaning fluid, so the ultrasonic waves can effectively clean tiny cracks and holes. Cavitation also promotes chemical reactions and accelerates the dissolution of the surface film. However, cavitation occurs only in the region when the liquid pressure in a region is lower than the gas pressure in the bubble, so that the ultrasonic amplitude generated by the transducer is sufficiently large to satisfy this condition. The small power of zui required to generate cavitation is called the cavitation critical point. Different liquids have different cavitation critical points, so the ultrasonic energy must exceed the critical point to achieve the cleaning effect. That is to say, cavitation bubbles can be generated only for energy exceeding the critical point for ultrasonic cleaning. The importance of frequency produces noise when the operating frequency is low (within the human hearing range). When the frequency is below 20 kHz, the working noise not only becomes very large, but may exceed the limits of safety noise as stipulated by occupational safety and health laws or other regulations. In applications where high power is required to remove dirt without regard to surface damage of the workpiece, lower cleaning frequencies ranging from 20 kHz to 30 kHz are typically selected. Cleaning frequencies in this frequency range are often used to clean large, heavy-duty or high-density workpieces. Jiekang provides a 20KHz magnetic transducer and a 25KHz piezoelectric transducer. CavitationStrengthRelativeto40kHz high frequencies are often used to clean smaller, more delicate parts or to remove tiny particles. High frequencies are also used in applications where damage is not allowed on the surface of the workpiece. The use of high frequencies improves cleaning performance in several ways. As the frequency increases, the number of cavitation bubbles increases linearly, producing more denser shock waves that allow them to enter smaller gaps. If the power remains the same, the cavitation bubbles become smaller and the energy released is correspondingly reduced, thus effectively reducing the damage to the surface of the workpiece. Another advantage of high frequencies is the reduced viscous boundary layer (Ponuri effect), allowing the ultrasound to 'discover' very fine particles. This situation is similar to the pebbles at the bottom of the stream when the water level in the creek is lowered. Jiekang offers a range of intermediate frequency products with 40kHz, 80kHz, 120kHz and 170kHz. When cleaning very small particles, a product with a frequency of 350 kHz can be used. Jiekang recently introduced the MicroCoustics system for such applications at a frequency of 400 kHz. Advantages of Ultrasonic Cleaning Ultrasonic cleaning has been recognized as having the following advantages: High precision Because the energy of ultrasonic waves can penetrate tiny gaps and small holes, it can be applied to the cleaning of any component or assembly. When the parts to be cleaned are precision parts or assemblies, ultrasonic cleaning often becomes the only cleaning method that can meet its special technical requirements; rapid ultrasonic cleaning is much faster than conventional cleaning methods in dust removal and descaling of workpieces. The assembly can be cleaned without disassembly. Ultrasonic cleaning can save labor and often make it a way to clean the zui economy; consistent whether the parts being cleaned are large or small, simple or complex, single or batch or on an automatic assembly line, ultrasonic cleaning can be used to obtain manual cleaning. Comparable uniform cleanliness. Ultrasonic cleaning process and cleaning fluid selection Before purchasing the cleaning system, the following application analysis should be carried out on the cleaned parts: clarify the material composition, structure and quantity of the parts to be washed; analyze and clarify the dirt to be removed; determine the cleaning method to be used. To determine whether to apply the aqueous cleaning solution or the solvent, the Zui needs to do the cleaning experiment. Only in this way can a proper cleaning system, a well-designed cleaning process and a cleaning solution be provided.
The choice of chemical agent takes into account the effect of the physical properties of the cleaning solution on ultrasonic cleaning, where vapor pressure, surface tension, viscosity and density should be significant factors influencing Zui. Temperature can affect these factors, so it also affects the efficiency of cavitation. Any cleaning system must use a cleaning fluid. Aqueous systems typically consist of open channels in which the workpiece is submerged. A complex system consists of multiple tanks with a circulation filtration system, a shower tank, a drying tank, and other accessories. For the system using the solvent, it is mostly an ultrasonic vapor phase degreasing cleaning machine, which is often equipped with a waste liquid continuous recovery device. The ultrasonic vapor phase cleaning process is accomplished by an integrated multi-slot system consisting of a solvent evaporation tank and an ultrasonic immersion tank. Oil, grease, wax, and other solvent-soluble soils are removed by the action of hot solvent vapor and ultrasonic agitation. After a series of cleaning processes, the workpieces that are unloaded are heated, cleaned, and dried. When selecting a cleaning solution, the following three factors should be considered: Cleaning efficiency: When selecting an effective cleaning solvent for Zui, it is necessary to experiment. If ultrasonic is introduced into the existing cleaning process, the solvent used generally does not have to be changed; the operation is simple: the liquid used should be safe and non-toxic, easy to operate and long in service life; cost: the cost of using inexpensive cleaning solvents is not It must be low. The cleaning efficiency and safety of the solvent, the amount of solvent that can be cleaned, and the high utilization rate of the workpiece must be taken into consideration. Of course, the cleaning solvent chosen must achieve a cleaning effect and should be compatible with the material being cleaned. Water is a common cleaning solution for Zui, so the system using water-based solution is easy to operate, low in cost, and widely used. However, for certain materials and dirt, etc., which are not suitable for aqueous solutions, there are many solvents to choose from. Another consideration for the cleaning of the cleaning parts is the design of the upper and lower materials of the cleaning parts or the tooling in which the cleaning parts are placed. When the cleaning parts are in the ultrasonic cleaning tank, the cleaning parts and the cleaning basket must not touch the bottom of the tank. The total cross-sectional area of ​​the cleaning member should not exceed 70% of the cross-sectional area of ​​the ultrasonic bath. Rubber and non-rigid plastics absorb ultrasonic energy, so care should be taken when using such materials for tooling. Insulating cleaning parts should also be given special attention. The tool basket is not designed properly, or the workpiece is too heavy, even though the efficiency of the good ultrasonic cleaning system is greatly reduced. Any material, if the mesh is above 50 mesh, exhibits physical properties for the ultrasound and reflects the ultrasound back. When the mesh is larger than 1/4 inch, the performance of the open material is exhibited for the ultrasonic wave. Hooks, shelves and beakers can be used to support the cleaning parts.
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