Eight steps to purchase an ultrasonic cleaner: eight steps, let you buy ultrasonic cleaners. When purchasing ultrasonic cleaners, first understand how your products can be washed, and second, what to achieve. The third kind of cleaning effect, the third is to predict how much the company's development output will reach, the maximum capacity of the machine to be purchased is the most, the fourth step is to understand the cleaning process, ask yourself what kind of process is used, or consult Ultrasonic manufacturers have no updated cleaning process. The fifth is to select some professional production companies to compare the cleaning process, price and after-sales service guarantee. The sixth is to make the equipment used in the equipment brand model, consumables Price, maintenance terms, etc. are written into the contract agreement to prevent fraud of some bad production enterprises. The seventh is acceptance. If it is a large-scale equipment, you should bring your workpiece to the production enterprise to go to the site for acceptance. After installing the training for your company's employees, you are sure that your employees are really learning, not the installers. He said to have trained before.
First, the choice of power: ultrasonic cleaning sometimes uses low power, it takes a long time and does not remove dirt. If the power reaches a certain value, the dirt is quickly removed. 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 also have an etch point, and the vibration plate at the bottom of the cleaning machine is cavitation and the water point corrosion is also increased. When using an organic solvent such as trichloroethylene, there is basically no problem, but when using water or a water-soluble cleaning solution, it is susceptible to water pitting corrosion. If the surface of the vibrating plate has been scratched, cavitation corrosion is more serious under high power. The ultrasonic power should be selected according to the actual use.
Second, the frequency selection: ultrasonic cleaning frequency from 28 kHz to 120 kHz, the physical cleaning force caused by the action of holes when using water or water cleaning agent is obviously beneficial to the low frequency, generally about 28-40kHz. For parts with small gaps, slits and deep holes, it is better to use high frequency (generally 40 kHz or more), even several hundred kHz. Use 100 kHz for cleaning watch parts. If you use broadband FM cleaning, the effect is better.
Third, the use of the cleaning basket: in the cleaning of small parts, often use the basket, because the mesh to cause ultrasonic attenuation, to pay special attention. It is better to use a mesh of 10 mm or more when the frequency is 28 khz.
Fourth, the temperature of the cleaning solution: the most suitable cleaning temperature of the water cleaning solution is 40-60 ° C, especially in the case of cold weather, if the cleaning solution temperature is low, the cavitation effect is poor, and the cleaning effect is also poor. Therefore, some washing machines are wound around the heating cylinder to heat the heating wire for temperature control. When the temperature rises, cavitation is easy to occur, so the cleaning effect is good. When the temperature continues to rise, the gas pressure in the bubble increases, causing the impact sound pressure to drop and the effect is also weakened. The organic solvent cleaning solution is washed at a temperature close to the boiling point.
5. How much the amount of cleaning liquid and the position of the cleaning parts are determined: Generally, the liquid level of the cleaning liquid is higher than the surface of the vibrating surface by more than 100 mm. Since the single-frequency cleaning machine is affected by the standing wave field, the amplitude at the node is small, and the amplitude at the amplitude is large, resulting in uneven cleaning. Therefore, the best choice for cleaning items should be placed at the volatility. (more effective range 3-18 cm)
Sixth, 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 washed parts, analyze and clarify the dirt to be removed, these are Decide which cleaning method to use and determine the preconditions for applying the aqueous cleaning solution or solvent. The final cleaning process also requires a cleaning experiment to verify. Only in this way can a proper cleaning system, a well-designed cleaning process and a cleaning solution be provided. Considering the influence of the physical properties of the cleaning solution on ultrasonic cleaning, the vapor pressure, surface tension, viscosity and density should be the most significant factors. Temperature can affect these factors, so it also affects the efficiency of cavitation. Any cleaning system must use cleaning fluid.
Seven, when choosing a cleaning solution, the following three factors should be considered: 1 . Cleaning efficiency: When choosing the most effective cleaning solvent, be sure to experiment. If ultrasound is introduced into the existing cleaning process, the solvent used generally does not have to be changed; 2 . Simple operation: the liquid used should be safe and non-toxic, easy to operate and long in service life; 3 . Cost: The cost of using the cheapest cleaning solvent is not necessarily the lowest. The cleaning efficiency and safety of the solvent, the amount of solvent that can be cleaned, and the highest 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 the most common cleaning solution, so the system using water-based solution is easy to operate, low in cost, and widely used. However, for certain materials, as well as dirt and the like, which are not suitable for aqueous solutions, there are many solvents to choose from. Different cleaning fluids, the washing system to be distinguished from the aqueous system: usually consists of an open tank, the workpiece is submerged. The complex system consists of multiple tanks and is equipped with a circulating filtration system, a shower tank, a drying tank and other accessories. Solvent system: mostly ultrasonic vapor phase degreasing machine, often equipped with continuous waste recovery device. The ultrasonic vapor phase degreasing process is accomplished by an integrated multi-tank system of solvent evaporation tanks and ultrasonic immersion tanks. Oil, grease, wax, and other solvent-soluble soils are removed by the combination of hot solvent vapor and ultrasonic agitation. After a series of cleaning processes, the workpieces that are unloaded are heated, cleaned, and dried.
8. Cleaning parts processing: Another consideration for ultrasonic cleaning is the design of the upper and lower materials of the cleaning parts or the tooling for placing the cleaning parts. 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 best ultrasonic cleaning system is greatly reduced. Hooks, shelves and beakers can be used to support the cleaning parts. Cleaning time: 1-10 minutes, preferably in a timed manner.
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