In contemporary society, various plastic products have penetrated into all areas of people’s daily lives. Traditional processing technology can no longer meet the development needs of modern plastics industry. When welding plastic products, the ultrasonic plastic welding machine neither needs to add any adhesive, filler or solvent, nor consumes a large amount of heat source. It has the advantages of simple operation, fast welding speed, high welding strength and high production efficiency. Therefore, ultrasonic welding technology is more and more widely used. The ultrasonic transducer system usually includes an ultrasonic transducer and an ultrasonic horn, which are the basic components for ultrasonic welding processing, and a good ultrasonic transducer is a prerequisite for ensuring ultrasonic welding processing.
Design of Ultrasonic Transducer
When the ultrasonic plastic welding machine is working, high-frequency longitudinal vibration is needed to process the plastic workpiece, which makes the upper and lower molds of the workpiece vibrate at high frequency to melt the welding layer and obtain the welding effect. Therefore, the type of transducer selected is a longitudinal composite transducer with a simple structure. The schematic diagram is shown in Figure 2. The first and the last two are metal cover plates; the middle is a piezoelectric ceramic crystal stack, which is generally a longitudinally polarized sheet or tube with a circular hole, or a radially polarized tube; a stress screw tightens these 3 parts Press firmly.
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