When you plan to purchase Chinese ultrasonic cleaner and consult a supplier, you should try your best to provide the following information, so that the Chinese supplier can quickly and accurately recommend a suitable ultrasound transducer cleaner for you.
- Workpiece material, characteristics, size, end use
Such as metals, glass, plastics, etc.;
Avoid processing some workpieces that are not suitable for cavitation cleaning or related cleaning solutions;
Useful for confirming the inner tank size and power of ultrasonic cleaning devices;
Based on past experience, suppliers can quickly provide ultrasonic cleaning processes and solutions for similar workpieces.
- Dirt composition and characteristics
Such as cutting oil and debris for machining, polishing wax or stamping oil, abrasives for optical lenses, etc.
- The choice of cleaning solvent
Based on previous experience, choose water-based solutions or organic solvent solutions, comparing their economy, production safety, etc.
- Daily output and production capacity of upstream and downstream process equipment
According to the current maximum production capacity, design the ultrasonic bath capacity, please avoid following the five-year or ten-year development plan blindly, then propose excessive production capacity requirements.
Under the conditions of unsaturated capacity, a high-capacity ultrasonic washing machine consumes much more water and energy, occupies a relatively large area, and leads to relatively high investment, which will inevitably be uneconomical in use.
- Selection of cleaning process and drying process
Based on your own user experience or refer to the user experience of counterparts, and compare to the improved process proposed by the Chinese supplier.
- Budget and lifetime cost accounting
The lifetime cost calculation should focus on power consumption, water consumption, consumables, and maintenance costs.
Even if the ultrasonic washer has the same process, due to different designs, the calculation of the above cost will be quite different.
- Waste removal and environmental protection issues
Some export-oriented enterprises should also consider policy restrictions and regulations in the fields where their products are exported.
Of course, before placing an order, it is best to do more than 1 cleaning experiment with a professional supplier, verify the process effect.
The following Chinese ultrasonic cleaner purchasing guide can help you better source ultrasonic cleaning devices from China.
Chinese Ultrasonic Cleaner Purchasing Guide
The ultrasonic cleaning effect is not always proportional to the power and cleaning time.
Sometimes, a low-power ultrasonic cleaning machine is used for a long time without removing the dirt.
And if the ultrasonic power reaches a certain value, the dirt can be removed soon.
If the ultrasonic power is too large, the cavitation intensity will be greatly increased.
Although the cleaning effect is improved, it will also erode the precision parts, and the gain will outweigh the loss.
Moreover, the bottom vibrating plate of the high-power ultrasonic wash tank suffers from severe cavitation, and pitting corrosion will increase accordingly.
If the cleaning solvent is trichloroethylene, there is basically no problem;
But when the water cleaning solution is used, it is prone to pitting corrosion.
If there are scars on the vibrating plate surface, the cavitation corrosion will be more serious under strong power, so the ultrasonic power should be suitable for actual use.
The higher the power, the better the cleaning effect, there is no doubt about this.
However, if the power is too high, it will slightly corrode the objects to be cleaned, so too much power is not good.
So how should you choose?
In fact, some manufacturers have also taken this into consideration.
Some ultrasonic cleaning devices can adjust the ultrasonic power by themselves, 1% to 99% adjustable.
Purchase an ultrasonic washing machine with adjustable power, if budget is enough, try to buy a high-power one.
The frequency of ultrasonic cleaning is between 20kHz and 400kHz.
When water solution is used, the physical cleaning power caused by cavitation is obviously beneficial to low frequency, generally, about 28-40kHz is used.
For cleaning parts with small gaps, slits, and deep holes, it is better to use high frequency (generally above 40KHz), even hundreds of kHz;
For machinery, hardware, automobile and motorcycle, compressor, or general objects with heavy pollution, ultrasonic cleaning machines with a frequency of 20KHz are mostly used;
For circuit boards, lens, optoelectronics, and general lab utensils, ultrasonic cleaning devices with a frequency of 40kHz are mostly applied;
For microelectronic components, integrated circuit chips, silicon wafers, and wave films, etc., mostly use 80kHz or higher frequency ultrasonic baths, which can remove micron and sub-micron dirt without damaging the workpieces.
When cleaning watch parts, use 400kHz, if it is broadband frequency adjustment cleaning, the effect will be better.
Most of the ultrasonic cleaners on the market have a frequency around 40-50kHz, this frequency is the most commonly used and is suitable for application in most scenarios.
However, because this frequency is used the most, the vibrator quality supplied by different suppliers varies.
Ultrasonic baths with high frequency (around 100kHz) or low frequency (25kHz) have relatively good vibrator quality, especially for some dual-frequency ultrasonic bath machines, the vibrator quality is definitely better than single-frequency ones.
Therefore, when purchasing, if the budget is enough, you can first choose dual frequency ultrasonic cleaners, and then choose high-frequency or low-frequency according to the object to be cleaned.
Ultrasonic cleaning process and solutions
Before purchasing ultrasonic cleaning systems, you should clarify the material composition, structure & quantity of the parts to be washed, analyze and clarify the dirt to be removed.
So that the cleaning process can be determined, and based on this, it can be judged whether to use water cleaning solution or solvent.
Ultrasonic cleaning system and process
The final cleaning process needs to be verified by cleaning experiments.
Only in this way can we provide a suitable sonic wave cleaner, a well-designed cleaning process, and choose suitable cleaning solutions.
- Water system
It is usually composed of an open tank in which the workpiece is immersed, while a complex system consists of multiple tanks and is equipped with a circulation filter system, a spray cleaning tank, a drying tank, and other accessories.
- Solvent system
Most of them are gas-phase degreaser ultrasonic cleaners, often equipped with continuous recycling equipment for waste liquid.
Ultrasonic vapor phase removal of grease is completed by an integrated multi-tank system, this system is composed of a solvent evaporation tank and an ultrasonic immersion tank.
Under the combined use of hot solvent steam and ultrasonic agitation, oil, grease, wax, and other solvent-soluble dirt are removed.
After a series of cleaning procedures, the unloaded workpieces are heated, clean, and dry.
Cleaning parts handling
Another consideration for cavitation cleaning is the loading and unloading of the cleaning parts or the ultrasonic basket design in which the cleaning parts are placed.
When the cleaning parts are in the ultrasonic cleaning tank, neither the cleaning parts nor the ultrasonic basket can touch the tank bottom.
The total cross-sectional area of the cleaning parts should not exceed 70% of the cross-sectional area of the ultrasonic bath.
Rubber and non-rigidized plastics will absorb ultrasonic energy, so take care when placing such materials in the ultrasonic basket.
Insulated cleaning parts should also pay special attention to.
If the ultrasonic basket design is improper or the workpiece is too heavy, the cleaning efficiency will be greatly reduced even with the best ultrasonic cleaning systems.
Hooks, racks, and beakers can all be used to support the cleaning parts.
The choice of ultrasonic solutions
Any ultrasonic cleaning machine must import cleaning solutions.
Considering the cleaning fluid physical properties’ impact on ultrasonic cleaning, the vapor pressure, surface tension, viscosity, and density are the most significant influencing factors.
Temperature can affect these factors, so it also affects the cavitation efficiency.
- Cleaning efficiency
When choosing the most effective cleaning solvent, be sure to do experiments.
If ultrasound is introduced into the existed cleaning process, the solvent used generally does not need to be changed;
- Easy to use
The liquid used should be safe, non-toxic, simple to operate, and have a long service life;
The cheapest cleaning solvent is not always equal to the lowest cost.
In use, factors such as the cleaning efficiency and solvent safety, how many workpieces can be cleaned by a certain amount of solvent, and the utilization rate must be considered.
Of course, the selected cleaning solvent must achieve the cleaning effect and be compatible with the workpiece material.
Water is the most common ultrasonic cleaning solution, so the system using the water-based solution is easy to operate, low in cost, and widely used.
However, for some materials and dirt, etc., it is not suitable for water solutions, so there are many solvents to choose from.
Ultrasonic solutions capacity and cleaning parts placement
Generally speaking, the cleaning liquid level is higher than the vibrator surface by more than 100mm.
Because the single-frequency ultrasonic cleaning machine is affected by the standing wave, the amplitude at the wave node is small, and the amplitude at the wave amplitude is large, resulting in uneven cleaning.
Therefore, the cleaning parts should be placed in the wave amplitude.
Ultrasonic cleaning solutions temperature
The most suitable cleaning temperature of the water cleaning solution is 40-60℃, especially in cold weather, if the temperature of the cleaning solution is low, the cavitation effect is poor, and the cleaning effect is also poor.
Therefore, some ultrasonic cleaning machines have heating wires around the outside of the tank for temperature control.
When the temperature rises, cavitation is prone to occur, so the cavitation cleaning effect is better.
Ultrasonic cleaner time
Different objects should be set to different cleaning times, ultrasonic power is a decisive factor.
When the ultrasonic power is relatively strong, the cleaning time is not long.
If it is cleaning glasses, necklaces, bracelets, gold, jewellery, and other small household items, and the objects to be cleaned are dirt, oil stains, it is usually 3-5 minutes;
But if the object to be cleaned is relatively large and the dirt is relatively heavy, 3-5 minutes are not enough.
Generally in the industry, the ultrasonic cleaning time can be set to 15-30 minutes.
When the ultrasonic power is too weak, it is not a problem of long and short cleaning time, it is very likely that the cleaning will not be effective.
For industrial ultrasonic cleaning tanks, the cleaning time is generally 15-30 minutes.
If the cleaning time is too long, it will cause cavitation spots on the surface of the cleaned workpiece, which will affect the surface finish;
When choosing an ultrasonic cleaning basket, the matters that need to consider are as follows:
The mesh-type ultrasonic cleaning basket facilitates the ultrasonic wave of the ultrasonic generator to reach the workpiece inside the basket, if it is closed ultrasonic basket, it will block the wave from reaching the workpiece inside.
In addition, the mesh-type open ultrasonic cleaning basket facilitates the runoff generated during the ultrasonic cleaning process, the runoff carries the dirt into the cleaning liquid, the dirt will not attach to the workpiece again.
Due to the different fineness degree of the workpieces, it is necessary to add a divider in the ultrasonic basket to avoid direct contact between these workpieces, thereby avoiding damage to the workpieces.
- Corrosion-resistant stainless steel material
This kind of tank is not easy to rust, it also extends the service life of the ultrasonic basket.
- Strong enough
If the ultrasonic basket is not strong enough, it will be separated due to long-term high-intensity vibration, so it must be made of high-strength stainless steel wire through high-strength welding.
Listen to the working sound
Listening to the sound refers to listening to the working sound of the ultrasonic cleaner.
In theory, ultrasound is a sound that cannot be heard by human ears, but in practice, the ultrasonic cleaning machine will make a certain amount of noise, which is caused by various reasons.
When the two different brand ultrasonic cleaning devices have basically the same material, and the same power and frequency, the one that has less noise is better.
The reason is: when the vibrator is working, it is not 100% in the ultrasonic frequency, a good vibrator is in the ultrasonic frequency for more time, and the noise is small.
The low noise indicates that the sealing between the materials is good, that is, the manufacturing process requirements are relatively high, and such equipment is more durable.
It shows that the manufacturer is truly thinking about customers, such a manufacturer will be better in terms of products and services.