Distribution and bonding issues of 12 transducers in cleaning tanks

At present, some ultrasonic cleaning machine products have transducers that are too densely distributed on the bottom or wall of the cleaning tank, arranged one by one. The input power intensity of the transducers reaches 2-3 watts per square centimeter. This high intensity will accelerate the cavitation corrosion of the stainless steel plate surface (the surface in contact with the cleaning solution), shorten the service life, and on the other hand, due to the high sound intensity. A large number of large bubbles will occur near the surface of the steel plate, increasing sound propagation loss and weakening the cleaning effect away from the transducer. It is generally advisable to choose a power intensity of less than 1.5 watts per square centimeter (calculated based on the area of the steel plate with the transducer attached). If the cleaning tank is deep, in addition to the transducer attached to the bottom of the tank, the transducer should also be considered for bonding on the tank wall. The bonding quality between the transducer and the cleaning tank has a significant impact on the overall quality of the ultrasonic cleaning machine. It is not only necessary to adhere firmly, but also to ensure that the adhesive layer is uniform, without missing glue, and no cracks are allowed, so as to maximize the transmission of ultrasonic energy into the cleaning solution and improve the efficiency and cleaning effect of the entire machine. At present, some cleaning equipment is used to prevent the transducer from falling off the cleaning tank. Adopting a screw and adhesive fixation method, although the transducer will not fall off, there are many hidden dangers in this connection method. If the welding quality of the screw is poor, such as not perpendicular to the surface of the stainless steel plate, the adhesive layer will be uneven, and there may even be cracks or missing adhesive, which will weaken energy transmission; On the other hand, poor welding can also affect the smoothness of the stainless steel surface, leading to accelerated cavitation corrosion and shortened service life. One of the methods to determine the bonding quality is to clean the tank with water and start working for a period of time, then measure the temperature rise of the transducer. If one of the many transducers has a particularly fast temperature rise, it indicates that the transducer may not bond well. This is because at this time, the sound radiation is poor, and most of the electrical energy is consumed by the transducer and generates heat. Another method is to measure the impedance of each transducer under small signal conditions to determine the bonding quality. Spot welding machine

At present, there are still some vague understandings about the performance of ultrasonic cleaning machines: the higher the power, the more transducers there are. The better the performance, the higher the value, and even the argument is based on this. This understanding is not comprehensive. As mentioned above, if the transducers are arranged too densely and the power density is too high, not only will the cleaning effect be poor, but also the bottom of the tank is prone to cavitation and corrosion. On the other hand, At present, the power indicated by ultrasonic cleaning machine products is mostly electrical power rather than acoustic power. If the indicated power refers to the consumption of power frequency, the quality of ultrasonic cleaning machines should be judged by efficiency. If the efficiency is low, Xinwandesheng ultrasonic equipment will have better efficiency when it has the same cleaning effect

 

 

 

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