Ultrasound Welding Transducer

Ultrasound welding transducer is a kind of energy conversion device, its function is to convert the input electrical power into mechanical power (that is ultrasonic) and then transmitted, and its own consumption of a small part of the power (less than 10%). Therefore, the use of ultrasound transducers should be considered the most problem is matching with the input and output end, followed by mechanical installation and matching size. There are many kinds of ultrasonic machinery on the market, the customer must provide accurate and reliable indicators to ensure that the ultrasonic welding transducer products provided by the company can match your machine well and give full play to the best performance.

Because the processing means and requirement are different, the working mode of ultrasound welding transducer can be divided for continuous work roughly (ultrasonic lace machine, ultrasonic plastic welder, ultrasonic zipper machine, ultrasonic metal welder), different working mode is different to the requirement of ultrasonic transducer. Generally speaking, continuous work almost no pause time, but the working current is not very large, pulse work is intermittent, there is a pause, but the instant current is very large. On average, the power in both states is very high.

FAQ

Q: Comparative analysis of performance of ultrasound welding transducer?

In ultrasonic cleaning, ultrasonic transducers can be divided into yellow plate transducer and black plate transducer，according to the color of piezoelectric ceramic plate used. Yellow film refers to the ceramic sheet of PZT-8 material, the ceramic body of this material is brown-yellow; Black sheet refers to the ceramic sheet of PZT-4 material used, the ceramic body of this material is black. Yellow ceramic is characterized by low heat, small amplitude, low capacitance, low heat. Which can make the ceramic performance attenuation is small, long service life, low capacitance and that can make the circuit easy to match and good stability. Black ceramic is characterized by large heat, large amplitude, large capacitance. Ultrasonic transducer is most often used for cleaning or welding, if the cleaning machine of the yellow film transducer can meet the cleaning requirements, it should give priority to the yellow film transducer, and the ultrasonic plate used in high temperature liquid should give priority to the yellow film transducer.

Q: What are the common problems in ultrasonic welding? What are the specific aspects?

Ultrasonic problem 1: ultrasonic current overload is abnormal

When the generator gives an overload alarm, it should be checked as follows:

1. Sometimes, the no-load test is normal, but it can not work normally. It may be that the internal changes of sound energy components such as welding head lead to poor sound energy transmission. Here is a relatively simple judgment method: hand touch method. When the welding head or horn surface works normally, the amplitude is very uniform, and it feels smooth like velvet by hand. When the sound energy transmission is not smooth, there will be bubbles or burrs by hand. At this time, the elimination method should be used to eliminate the problematic parts. When the generator is abnormal, the same situation can also occur, because normally, the input waveform of the transducer should be a smooth sine wave when detecting the input waveform. This phenomenon can also occur when there are spikes or abnormal waveforms on the sine wave. At this time, another whole branch of sound energy element can be used for identification.

2. Ultrasonic no-load test, if the working current is normal, it may be that the ultrasonic welding head contacts the objects that should not be contacted or the parameter adjustment between the ultrasonic welding head and the welding seat fails.

3. When the ultrasonic no-load test is abnormal, you should first observe whether the ultrasonic mold has cracks and whether the installation is firm, and then remove the welding head for no-load test. Eliminate whether there is a problem with the ultrasonic transducer + ultrasonic horn, and eliminate it step by step. After eliminating the possibility of failure of the transducer + horn, replace the new welding head to judge.

Ultrasonic problem 2: abnormal heating of ultrasonic mold

When the ultrasonic mold is working, there will be certain heating phenomenon, which is caused by the loss of mechanical energy of the material itself and the heat conduction of the ultrasonic object. The judgment standard for the normal heating of the ultrasonic mold is that when there is no load (i.e. no contact with the workpiece), the ultrasonic wave is emitted continuously for more than half an hour, and the temperature should not exceed 50-70 ℃. If the heating is harmful, it proves that the ultrasonic mold has been damaged or the material is unqualified, and it needs to be replaced; Mold temperature is too high, usually accompanied by abnormal ultrasonic current;

Ultrasonic problem 3: abnormal howling of ultrasonic mold

When the ultrasonic mold screams, the following reasons should be analyzed:

1. Whether the ultrasonic mold is in contact with the objects that should not be contacted;

2. Whether the screws of ultrasonic welding head are loose;

3. Whether the ultrasonic mold has cracks;

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