When the ultrasonic welder has no sound waves, the mold can be removed to check for sound waves. If the sound wave still does not exist, continue to check if the current pointer is swung. If the pointer swings correctly, you need to check if the oscillator line is off. For the phenomenon that the ultrasonic welder has no sound wave output, firstly, it is necessary to judge whether there is ultrasonic current output, that is, whether the load table is oscillated or not. The normal ultrasonic no-load current is generally about 0.5a; if Re is not such a current, it basically means ultrasonic wave. The generator is damaged and the ultrasonic board is damaged, so we should pay attention to it. Check the repair circuit.
If the output of the ultrasonic board is greater than 0.5A to 1A, it indicates that the ultrasonic generator has an oscillating current and cannot effectively transmit the sound wave to the portion of the ultrasonic transducer, for example, opening the connection in the middle. Of course, the inside of the ultrasonic sensor may also be completely damaged. At this point, the simple method is to use a normal sensor test to distinguish the problem; of course, if the current is larger, greater than 1A, greater than the normal no-load current, then the sensor part should be inspected, whether there is crack. Does the horn have cracks, etc.
After determining the problem with the ultrasonic generator, it is important to check whether the test triggered by the ultrasonic wave of the circuit is triggered. The total circuit is controlled by a relay. If the relay is operating without current output, the post-stage oscillating circuit is damaged. If the push relay does not operate, the relay must be checked. Drive circuit.
The common problem with the rear-stage oscillating circuit is the damage of the power board, which accounts for 50% of all faults in the ultrasonic welder. The replacement and repair of the ultrasonic power board is very simple and will not be discussed in this article. Other faults are component damage in the resonant circuit, such as frequency modulation inductors, resonant capacitors, biasing elements of power transistors, base accelerators of power transistors, and the like.
After excluding the above problem, be sure to check the output circuit. The output circuit is connected to the ultrasonic sensor and forms a parallel resonant circuit with the ultrasonic sensor. Due to failure or change of various components in the circuit, the vibration may be deactivated or weakened and should be completely eliminated.
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