Control system of ultrasonic welding machine

Abstract

The invention belongs to the technical field of welding and relates to a control system of an ultrasonic welding machine. The control system solves the problems of poor working stability, low efficiency, low working quality and the like of the existing ultrasonic welding machine. The control system of the ultrasonic welding machine comprises an inverter, an ultrasonic transducer and a central processing unit; the inverter is respectively connected with the central processing unit and the ultrasonic transducer; a frequency tracking control system is connected between the inverter and the ultrasonic transducer; a sensor which is used for detecting a frequency signal and arranged at a tool head is connected between the ultrasonic transducer and the central processing unit; the inverter inputsvoltage and current signal parameters to the central processing unit, and the sensor inputs the frequency signal parameters at the tool head to the central processing unit, the processing is carriedout, and the controlled quantity is calculated; and a pulse generator which is used for generating a frequency pulse signal according to the controlled quantity is further connected between the inverter and the central processing unit. The control system of the ultrasonic welding machine has the advantages of simple structure, good stability, high working efficiency and quality and the like.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a welding device, in particular to a control system of an ultrasonic welding machine. Background technique [0002] The ultrasonic power supply provides ultrasonic frequency alternating current signals to the ultrasonic transducer, and its realization circuit is also called the ultrasonic drive circuit. In the 20th century, with the rapid development of electronic technology, the power devices used in ultrasonic inverter power supply have gone through four stages: electron tube, thyristor, transistor and IGBT. In recent years, new circuit topologies and new power devices have been used in circuit design. The reliability, load adaptability, and product consistency of ultrasonic power supplies have been further improved. At the same time, the efficiency has also been greatly improved, and the volume of products has also been reduced at any time. [0003] The traditional ultrasonic ...

AI Technical Summary

Problems solved by technology

For example, for the self-excited oscillation mode, if the piezoelectric transducer has multiple resonance modes, this method is unreliable; for the phase-locked mode, the frequency automatic tracking needs to add a transducer compensation component in the drive circuit; and for the dynamic Feedback frequency tracking method, the direction of frequency adjustment is still difficult to grasp, and it is difficult to realize automatic control

In addition, in various frequency tracking methods, the feedback signals come from ultrasonic transducers or oscillation control signals, ignoring the influence of ultrasonic equipment such as horns and tool heads on resonance, and not detecting the actual frequency output conditions at the tool head ( Usually after adding the load, the output frequency will be obviously changed), such as the Chinese patent authorization announcement number CN201147869Y named "High Power Ultrasonic Metal Welding Machine Adaptive Signal Source"

According to the above analysis, the current implementation schemes of high-power ultrasonic welding processing control are not ideal, and all have defects.

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