High frequency machine, high frequency plastic welding machine (hereinafter referred to as English Hing freguency plastic welder), converts electrical energy into electromagnetic wave is made up of vacuum tubes, through oscillation become high frequency electromagnetic fields, in all kinds of transmission path to high frequency transmission to Mo (pole), PVC tape at Mo and grounding (i.e., high frequency electromagnetic field in the upper and lower pole), between polar molecules plastic polarization strenuous exercise and heat generation.Under the pressure of the die, the adhesive can achieve the effect of welding finalizing.
The key technology of high frequency machine is to generate high frequency electromagnetic field.The vacuum tube of the welding machine converts high voltage electric energy into electromagnetic energy, which generates high frequency electromagnetic field through the oscillation of the oscillating barrel.The oscillation frequency of the oscillating barrel directly affects the strength of the output force, and then affects the welding quality of the product. In mechanization, digital today, high frequency plastic welding machine oscillation frequency regulation is still dependent on workers with experience.This kind of manual adjustment mode often leads to defects or even failure of product welding, and the production cost rises. Therefore, the best way to solve this problem is to measure the optimal oscillation frequency with electronic instruments.
Zhengzhou Defy digital oscilloscope has two methods to measure signal frequency: software method and hardware method.Software method is the software in the oscilloscope memory real-time storage of waveform intercept one of the calculation of the average period, and then converted to frequency.The frequency of the hardware method is measured by the hardware frequency meter, which takes the calculated trigger times per second of the trigger circuit as the frequency, so the signal must be in the trigger state when measuring. The measured values of software method and hardware method are consistent when measuring regular waveforms, but for irregular waveforms, there will be a big difference in the measured values. At this time, the measured values of software method are constantly changing and have no practical significance. The measured values of hardware method are more stable and closer to the average frequency, which can be used as a reference. In addition, the measurement of oscillation frequency requires high precision, which needs to be accurate to 3 decimal places, the software measurement value is only 2 decimal places, and the hardware frequency meter can reach more than 3 places.Because of the high requirement of frequency precision, it is better to use the active crystal oscillator oscilloscope.
Found in the actual measurement, signal noise is bigger, lead to frequency meter display and the actual hardware is wrong, which requires the oscilloscope is enough to have very good the ability to deal with noise filtering, SDS1000CFL with its unique function of the digital filter (low-pass, high-pass, band-pass, with resistance), which can effectively avoid noise caused by false trigger, make more accurate measurements.
Measurement is different from the ordinary measuring induction method, inductive method to measure the passive sensor probe and virtual circuit, formed between grounding alligator clip when electromagnetic fields through this circuit generates a induction and through probe into the oscilloscope, so the earthing grounding alligator clip, probe is separated from the crocodile clip to form linear antenna or connect probe and alligator clip form a loop. In order to avoid the interference of noise, the ground crocodile clip should be grounded.Since only the frequency value needs to be measured, the operation steps are relatively simple. Firstly, adjust the horizontal and vertical gears of the oscilloscope to the appropriate position (multiple tests are required in advance), turn on the digital filtering function, probe induction signal, observe the reading of the hardware frequency meter, and finally record the best oscillation frequency of different products.In the production of the corresponding products, the oscillation frequency is adjusted to the best reproduction to improve the yield.
The method of measuring the frequency of oscillations by induction can be applied to other high-frequency machines that work on similar principles. This is a simple application of oscilloscope.With the increase of function and precision, oscilloscope will gain more applications and popularity in the field of measurement and measurement.