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| How to Use Transducer Correctly |
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| Source：Suzhou Jiahui Ultrasonic Technology Co., Ltd Release time：2018-06-11 |
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Some manufacturers do the ultrasonic cleaning machine, cleaning tank bottom or wall of the vibration plate transducers are too densely distributed, one by one in a row, such as: input transducer power intensity of 2-3 watts per square centimeter, such a high intensity on the one hand will accelerate the surface of the vibration plate cavitation corrosion, shorten the service life, on the other hand, because the sound intensity is too high, will produce large near the surface of the vibration plate. A large number of bubbles, far away from the transducer, weaken the cleaning effect. Normally, the power intensity is less than 1.5 W per square centimeter (calculated according to the area of vibration plate with transducer). The bonding quality between transducer and vibration plate has a great influence on the quality of the whole ultrasonic cleaner. It is not only necessary to adhere firmly, but also to have a uniform adhesive layer, no glue shortage and no cracks, so that the ultrasonic energy can be transmitted to the cleaning solution to the maximum extent, so as to improve the efficiency and cleaning effect of the whole machine.
At present, there are some cleaning equipment to avoid the transducer falling off. It is good to adopt screw and viscose fixing method, but there are many hidden dangers. If the screw is not welded well, such as not perpendicular to the surface of the stainless steel plate, the glue layer will be uneven or lack glue when the transducer is screwed on, and the energy transmission will be weakened. On the other hand, if the screw is not welded well, it will also affect the surface of the stainless steel, leading to accelerated cavitation corrosion and shorten the service life. One of the methods to judge the bonding quality of transducer is to measure the temperature rise of transducer after putting the vibration plate into water and working for a period of time. If the temperature of one of the transducers rises very fast, it indicates that the transducer may not bond well.
In terms of performance, some people will think that the higher the power, the more transducers. The better the performance, the higher the value, and even the value. This understanding is not comprehensive. As mentioned above, the transducer is too dense and the power density is too high, not only the cleaning effect is not good, but also the bottom of the groove is prone to cavitation corrosion. The efficiency of the ultrasonic cleaner includes two parts: one is the efficiency of the ultrasonic frequency power supply, i.e. the percentage of the high frequency power of the input transducer to the power consumption of the power frequency; the other is the electro-acoustic conversion efficiency, i.e. the percentage of the sound power entering the cleaning solution to the electric power of the input transducer.
In the low-ultrasonic frequency band (20-100KHz), most of the piezoelectric transducers (composite transducers) are clamped by single screw in industry. The structural difference lies mainly in the shape of the radiator (aluminium block bonded with stainless steel plate), one is conical horn, the other is straight rod. The sound radiation efficiency of the horn transducer is higher than that of the rod transducer, i.e. the same input electric power. The larger sound power is obtained in the cleaning tank and the less electric power is consumed on the transducer, so the heat of the transducer is also lower. When the electric power of the input transducer is the same, the sound intensity of the radiation surface of the horn is lower than that of the rod transducer because the area of the radiation surface of the horn is larger than that of the rod transducer. The surface cavitation corrosion of stainless steel plate is small. The service life of the cleaning tank (or immersion transducer) is prolonged. In order to further improve the efficiency of sound radiation and broaden the frequency band, a Semi-Perforated broadband ultrasonic cleaning transducer has been developed in China.
This kind of transducer has more advantages, especially in the high frequency band {40KHz > because it can weaken the harmful effect of transverse vibration, because the frequency band is wider, and it is also conducive to frequency sweep cleaning. In some occasions, for example, when cleaning deeper screw holes, it is advisable to use a transducer with high radiation sound intensity. At this time, the radiator of the transducer often has a sharp focusing shape to improve the sound intensity of the radiation surface. This transducer is usually not bonded to the cleaning tank, but directly inserted into the liquid for cleaning.
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