As a
metal detection machine (also called metal detector)used for detection of food raw materials, additives, food, pill, candy, aquatic products, dried vegetables, frozen food, shoes, toys, plastics, metal foreign bodies, chemical and other industries.
Shanghai Shigan Industrail Co,.Ltd metal detection machine is the core component of the structure of products in the shape of the upper machine testing header, detection in the first three coil inside, typically use a casting molding, to ensure that the coil and the overall, reliable and is not affected by the interference of external factors, such as mechanical vibration, etc.), good stability, has high precision, stable performance, strong anti-interference ability, etc.
Le détecteur de métal est généralement composé de deux parties, à savoir la bobine de détection et le dispositif d'élimination automatique, dont la bobine de détection est la partie centrale.Lorsque la bobine est sous tension, un champ magnétique sera généré et le métal entrera dans le champ magnétique , ce qui modifiera le champ magnétique. Par conséquent, les impuretés métalliques peuvent être jugées.Tout d'abord, nous devons comprendre quelques concepts, à savoir, qu'est-ce qu'un courant vortex? Comment un champ magnétique est-il créé? Lorsqu'un objet métallique est dans un champ magnétique changeant ou se déplace dans un champ magnétique, un courant induit sera généré dans le métal. . Ce courant forme une boucle à l'intérieur du métal sous la forme d'un vortex, appelé courant de Foucault.Selon le principe du champ électromagnétique, la génération du champ magnétique est relativement simple. Le champ électrique changeant avec le temps peut générer un champ magnétique, tandis que le champ magnétique changeant avec le temps peut générer un champ électrique. Les deux sont interdépendants et indispensables.
Now that we know how eddy currents and magnetic fields are generated, let's talk about the coils of a metal detector.Contains three coil detection head, three into a symmetric relationship, in the middle of the coil (launch) through the high frequency oscillator to launch high frequency electromagnetic field, on both sides of the (receive coil) used to receive the electromagnetic wave signals, when the outside world without metal objects close to the electromagnetic field, because of the way through reverse polarity connection on both sides of the coil, no induction voltage output.At this point if there is a metal impurity entering the magnetic field influence area, two receiving coil can appear signal cannot be offset, output induction difference is not zero, the induced voltage flows through filtering, demodulation circuit, system real-time acquisition the numerical value and to the high speed DSP calculation analysis, concluded that detect the presence of metal, controlled by the controller to realize the alarm, and automatically remove metal material.All metal foreign body detection model of the working principle of the coil, but for the aluminium film packaging testing machine, metal coil structure, winding and your work style is different, the upper and the lower side of the aluminium film packaging testing machine part is composed of many a coil, according to the size of the probe head, ranging from a dozen to a few dozen, and each coil is composed of many uniform copper wire winding on a coil skeleton, and installed on each coil skeleton powerful magnet, when the outside world has a ferromagnetic metal near the detection head, can appear cutting lines, by the electromagnetic field theory, we know that cutting the magnetic field will be induced in the coil winding current,The strength of the current reflects the size of the metal. The current signal flows through the current detector on the circuit board of the metal detection machine system, and the change of the current is detected and compared with the memory value. Once the value exceeds the current value, it will be judged as metal impurities, so as to complete the detection of metal substances.Si vous avez encore des questions ou souhaitez en savoir plus,
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