Ultrasonic plastic welding machine is composed of pneumatic transmission system, control system, ultrasonic generator, transducer, tool head and mechanical device. 1, pneumatic transmission system includes: niigata, pressure reducing valve, oil mist, commutator, throttle valve, cylinder, etc. When working, the air compressor firstly drives the stroke cylinder to drive the vibration system of ultrasonic transducer to move up and down. The dynamic pressure is adjusted according to the welding needs in the ultrasonic welding of medium and small power.

2. Control system The control system consists of time relay or integrated circuit time timer. The main functions are: one is to control the pneumatic transmission system work, so that the welding under the timing control to open the gas valve, the cylinder pressure welding head down, with a certain pressure on the welding object, when the welding is finished after a period of pressure, and then the control system will be gas valve reversing, so that the welding head back reset; The second is to control the ultrasonic generator working time, the system makes the whole welding process to achieve automation, operation only start the button to produce a trigger pulse, it can automatically finish the whole welding process. The sequence of the whole control system is as follows: the power supply starts a trigger control signal pneumatic transmission system, the cylinder pressure welding head drops and presses the welding trigger ultrasonic generator to work, emits ultrasonic and maintains a certain welding time, removes ultrasonic emission and continues to maintain a certain pressure time to withdraw pressure, and the welding head rises and finishes.

3, ultrasonic generator (1) high power ultrasonic plastic welding machine, the generator signal adopts phase-locked frequency automatic tracking circuit, so that the frequency of the generator output is basically consistent with the resonant frequency of the transducer. (2) The generator used in the ultrasonic plastic welding machine with more than 500W power adopts the self-excited power oscillator, and also has a certain frequency tracking ability.

4. The acoustic system used by ultrasonic plastic welding machine
(1) The acoustic system of ultrasonic plastic welding machine includes three parts: 1 driving part, 2 fixed part and 3 working part. In the above three parts, the driver is the core, generally adopts bolt clamping longitudinal vibration transducer, the half wave vertical oscillator with a quarter of the wavelength of longitudinal vibrator, half the wavelength of longitudinal vibration and the half wave shaped device connected to form a full wavelength plastic welding transducer, and the quarter wave vertical oscillator with quarter wave shaped device is linked together, Form a half-wavelength transducer.
(2) The tool head needs different tool heads for different welding objects, whether it is near field welding or transmission welding, only the tool head with half wavelength can achieve the maximum amplitude of the welding end face. There are two kinds of tool head with amplitude amplification and without amplitude amplification. The acoustic system tool head for plastic welding machine is usually made of aluminum alloy, and its end face is plated with hard alloy. When the power is large, it is also made of titanium alloy, and the fatigue strength of this material is more than twice that of aluminum alloy.