The ultrasonic plastic welding 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 work of the pneumatic transmission system to open the gas circuit valve under timing control during welding. The cylinder pressurizes 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 generator. This system automates the entire welding process. During operation, only the button is activated to generate a trigger pulse, and it can be completed automatically. In the whole welding process. 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 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 welding machine 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 machine includes three parts: 1 driving part, 2 fixed part and 3 working part. Among the above three components, the drive is the core. Generally, a bolt-clamped longitudinal vibration transducer 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 welded 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 welding end faces. Tool heads, with and without amplitude amplification, are used for acoustic system tool heads for plastic welding machines. The material used is usually aluminum alloy, and the end surface is plated with cemented carbide. When the power is high, it can also be made of titanium alloy. As a result, the fatigue strength of the material is more than twice that of aluminum alloy.
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 work of the pneumatic transmission system to open the gas circuit valve under timing control during welding. The cylinder pressurizes 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 generator. This system automates the entire welding process. During operation, only the button is activated to generate a trigger pulse, and it can be completed automatically. In the whole welding process. 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 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 welding machine 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 machine includes three parts: 1 driving part, 2 fixed part and 3 working part. Among the above three components, the drive is the core. Generally, a bolt-clamped longitudinal vibration transducer 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 welded 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 welding end faces. Tool heads, with and without amplitude amplification, are used for acoustic system tool heads for plastic welding machines. The material used is usually aluminum alloy, and the end surface is plated with cemented carbide. When the power is high, it can also be made of titanium alloy. As a result, the fatigue strength of the material is more than twice that of aluminum alloy.
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