Overview of transducer of ultrasonic plastic welding machine

As the name suggests, ultrasonic plastic welding machine is used to process plastic workpieces. Through the blessing of ultrasonic technology, it is applied to plastic workpieces to achieve the effect of welding. In order to pursue a good ultrasonic plastic welder mold, many factories will constantly debug the welding machine to make its welding more accurate. There are many reasons that affect the welding process of ultrasonic plastic welding machine, including ultrasonic vibration welding system. The transducer in this system has a great impact on welding. Let's understand the transducer of ultrasonic plastic welding machine.

When the ultrasonic plastic welding machine is welding the plastic workpiece, the plastic workpiece needs high-frequency Longitudinal Vibration, so that the upper and lower molds of the plastic workpiece can vibrate up and down with high frequency to produce melting phenomenon and form the effect of welding. Therefore, the transducer of the ultrasonic welding machine generally selects the longitudinal composite type. The structure of the transducer is relatively simple. There are two metal cover plates on both sides of the head and tail, and the middle is composed of piezoelectric ceramic crystal piles. These crystal piles are generally longitudinally polarized circular tubes or circular holes. Of course, they may also be radially polarized circular tubes. These three parts are tightly fixed by a stress screw. The length of electromechanical ceramic body and cover plate of ultrasonic plastic welding will affect the performance of transducer and the speed of ultrasonic transmission. The manufacturer of welding machine will continuously calculate the frequency generated by different front and rear cover plate lengths and diameters through experiments, and calculate the vibration speed ratio before and after through the vibration equation. In order to obtain a precise ultrasonic plastic mold, it is necessary to find a better connection elasticity between the cover plate and the ceramic crystal stack through this calculation and analysis. Through the experimental analysis of the manufacturer, it is found that under the principle of equivalent characteristic acoustic impedance, the ultrasonic plastic welder machine can replace the part connected between the rear cover plate and the ceramic crystal pile with hard aluminum.

The above is an overview of the transducer of ultrasonic plastic welder. Through the overview, we can know that the structure of the transducer includes metal cover plate, piezoelectric ceramic crystal pile and stress screw. The transducer of ultrasonic welding equipment can change its performance by changing the length of internal parts. The manufacturer of welding machine will get a better transducer through continuous research and experiment. Make the welding of ultrasonic plastic weld mold more accurate and make the welding process of the factory more smooth. It is hoped that more modern science and technology can be applied to the improvement of the transducer to make the vibration frequency of the ultrasonic plastic welding machine more stable and more effective.