The Role Of Ultrasonic Plastic Welder Machine

The ultrasonic plastic welder machine is composed of pneumatic transmission system, control system, ultrasonic generator, transducer, tool head and mechanical device.

1. Pneumatic transmission system

Including: flow regulator, pressure reducing valve, lubricator, commutator, throttle valve, cylinder, etc.

When working, the stroke cylinder is first driven by an air compressor to drive the ultrasonic transducer vibration system to move up and down. The power air pressure is adjusted according to the welding needs in the medium and small power ultrasonic welding.

2. Control system

The control system is composed of time relay or integrated circuit time timer. The main functions are: One is to control the operation of the gas transmission system, so that the gas valve is opened under timing control during welding. The cylinder is pressurized to lower the welding head and press the welded object with a certain pressure. After the welding is completed, the pressure is maintained for a period of time. , And then the control system reverses the gas path valve to reset the welding head; the second is to control the working time of the ultrasonic welding generator, and only activate the button to generate a trigger pulse during operation, and the whole welding process can be automatically completed. The sequence of the entire control system is: the power supply activates a trigger control signal pneumatic transmission system, the cylinder pressurizes the welding head to descend and presses the welding to trigger the ultrasonic generator to work, emit ultrasound and maintain a certain welding time, remove the ultrasonic emission, continue to maintain a certain pressure, and depressurize , The welding head rises and the welding ends.

3. Ultrasonic welding generator

(1) Ultrasonic plastic welding machine with higher power, the generator signal adopts a phase-locked frequency automatic tracking circuit, so that the output frequency of the generator is basically consistent with the resonant frequency of the transducer.

(2) The generator used in the ultrasonic plastic welder with a power above 500W adopts a self-excited power oscillator, which also has a certain frequency tracking ability.

4. Acoustic system used by ultrasonic plastic welding machine

(1) Transducer

The acoustic system for ultrasonic plastic welding equipment includes three parts: 1 driving part, 2 fixed part and 3 working part. In the above three components, the drive is the core. Generally, a longitudinal vibration transducer clamped by a bolt is used. The half-wavelength longitudinal vibrator is the same as the quarter-wavelength longitudinal vibrator, and the half-wavelength longitudinal vibrator is the same as the half-wavelength concentrator. The connection forms a full-wavelength plastic welding transducer, and the quarter-wavelength longitudinal vibrator is connected with the quarter-wavelength concentrator to form a half-wavelength transducer.

(2) Tool head

Different welding objects need different tool heads. Whether it is near-field welding or transmission welding, only half-wavelength tool heads can achieve the maximum amplitude of the welding end face. Tool head, there are two types with amplitude amplification and without amplitude amplification. The tool head of the acoustic system for ultrasound plastic welding machine is usually made of aluminum alloy, and its end surface is plated with hard alloy. When the power is high, it can also be made of titanium alloy material. The fatigue strength of this material is more than twice that of aluminum alloy.