First, the choice of power
The effect of the ultrasonic cleaner is not necessarily proportional to (power × 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. Large, 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.
Second, the choice of frequency
Ultrasonic cleaning frequency is from 28 kHz to 120 kHz. The physical cleaning force caused by cavitation when using water or water cleaning agent is obviously beneficial to low frequencies, generally around 28-40 kHz. 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. When cleaning the watch parts, use 400kHz. If you use broadband FM cleaning, the effect is better.
Third, the use of the cleaning basket
When cleaning small parts, the basket is often used, and it is particularly noticeable because the mesh is causing ultrasonic attenuation. It is better to use a mesh of 10 mm or more when the frequency is 28 khz.
Fourth, the choice of cleaning fluid temperature
The most suitable cleaning temperature for the water cleaning solution is 40-60 ° C. Especially in the case of cold weather, if the cleaning liquid 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 vacuole increases, causing the impact sound pressure to drop, reflecting the multiplication of these two factors.
5. Determination of the amount of cleaning fluid and the location of the cleaning parts
Generally, the liquid level of the cleaning liquid is preferably more than 100 mm above the surface of the vibrating body. 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.
Sixth, ultrasonic cleaning process and selection of cleaning fluid
Before purchasing the cleaning system, the following application analysis should be carried out on the parts to be cleaned: clarify the material composition, structure and quantity of the parts to be washed, analyze and clarify the dirt to be removed, which are all deciding which cleaning method to use and judging the application. Aqueous cleaning solutions are also a prerequisite for solvents. 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 a cleaning fluid.
When choosing a cleaning solution, there are three factors to consider:
1. Cleaning efficiency: When selecting the most effective cleaning solvent, it is necessary to do the experiment. If ultrasound is introduced into an 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.
Seven, different cleaning fluids, the cleaning system to be distinguished
Aqueous system: usually consists of an open trough, 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-slot system formed by 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.
Eight, cleaning parts processing
Another consideration for ultrasonic cleaning is the design of the upper and lower materials of the cleaning member or the tooling in which the cleaning member is 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 best ultrasonic cleaning system is greatly reduced. Hooks, shelves and beakers can be used to support the cleaning parts.
9. Clear cleaning time, type of workpiece and quantity
※ The use of the machine working mode is fully automatic, semi-automatic and manual.
※ Machine size and cost.
Ten, other
Parts that are cleaned of large amounts of dirt are generally pre-cleaned by dipping, spraying, and the like. After removing most of the dirt, the remaining dirt is ultrasonically cleaned, and the effect is good. If you clean small items and items (parts) with complicated shapes, if you use a cleaning net or rotate the cleaning object, you can use ultrasonic radiation while vibrating to get even cleaning.
4 Wire Intercom System,Analog Intercom System Doorbell,China 4 Wire Video Door Phone,4 Wire Connection System,4 Wire Intercom
Zhuhai Mingke Electronics Technology Co., Ltd , https://www.zhmkdz-electronics.com