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      Ultrasonic cleaners solve industrial cleaning challenges

      There are many manufacturers and models of ultrasonic cleaning machines, but their main function is to complete the cleaning of various objects, and its cleaning effect has been widely recognized by the majority of users. Many industrial manufacturers are faced with such a problem. The liquid that penetrates into the welding joints during the process of degreasing, rust removal, water washing, surface conditioning, and phosphating of the workpiece is difficult to discharge, and cannot be completely removed by water washing. rust. If these residual liquids cannot be completely dried during the drying process, when the powder is sprayed and dried at high temperature, the residual liquid will seep out of the weld due to thermal expansion, affecting the combination of the coating and the metal surface, resulting in a decrease in the adhesion of the coating. even break away.

      In this regard, the general factory adopts high-pressure spraying and multiple washings, or changes the drying process and increases the drying temperature to solve the residual liquid in the cracks. These methods not only cause waste of water resources and energy, but also damage the phosphating film and reduce its corrosion resistance by high-temperature drying, so the effect is not ideal. The ultrasonic rinsing utilizes the "pervasive" characteristics of ultrasonic waves and the "cavitation" effect, so it can quickly and thoroughly remove the residual liquid and debris in the welding gap to meet the quality requirements of subsequent processing.

      Studies have shown that the effect of ultrasonic rust removal and rinsing depends on cavitation, and the generation of cavitation is related to the intensity of ultrasonic waves. Usually, cavitation can be generated when the ultrasonic power per unit area is 0.3/cm2 in the water-soluble medium. Within a certain range, the greater the ultrasonic intensity, the more obvious the cavitation effect. Generally, it is appropriate to select a power density of 1~1.2w/cm2 in cleaning.

      Ultrasonic vibration frequency has a great influence on the cleaning effect. Under the same power, low frequency is easy to intensify cavitation, that is, 16~25khz cavitation is the best. During surface treatment, 16~20khz low frequency is suitable for large and medium-sized mechanical parts with serious oil stains and rust, and 26khz is suitable for some parts with high surface cleanliness requirements and blind holes and wire holes.

      Ultrasonic cleaning temperature is an important factor affecting the cleaning speed. Properly increasing the cleaning temperature can increase the cavitation capacity and shorten the cleaning time. However, if the temperature exceeds a certain temperature, the cavitation effect will be reduced due to the increase of the vapor pressure. Therefore, it must be maintain a certain temperature. The test shows that the water-soluble medium generally has the best effect at 50℃±5.