High-accuracy metal detection sensor device

Abstract

The invention discloses a high-accuracy metal detection sensor device which comprises an inner cylinder, a detection coil, a magnetic permeability layer and an electromagnetic shielding layer. A groove is arranged in the middle of the outer surface of the inner cylinder, and the detection coil is wound in the groove and comprises a primary coil and a secondary coil. The high-accuracy metal detection sensor device is characterized in that the primary coil is wound in the groove of the inner cylinder, the secondary coil is wound on the outer surface of the primary coil, the magnetic permeability layer is fixed on the outer surface of the inner cylinder, namely the outer surface of the detection coil, and the electromagnetic shielding layer is arranged outside the magnetic permeability layer. The high-accuracy metal detection sensor device is simple in structure, high in interference resistance, high in metal detection sensitivity, fine in stability, low in maintenance cost and applicable to various metal detection and separation devices, and can detect tiny ferrous and nonferrous metal particles such as copper, aluminum, stainless steel and alloy.

Description

technical field [0001] The invention relates to a high-precision metal detection sensor device, which is a device for detecting metal from non-metallic granular or massive materials. Background technique [0002] Metal detector is a kind of metal detection equipment, which is generally based on the principle of electromagnetic induction, which generates induction signals for metal impurities in mixed products or metal substances carried by the human body, and has achieved the function of eliminating or alarming. In the metal detection process, the metal detection sensor plays a vital role, which directly affects the sensitivity, metal detection accuracy, anti-interference and stability of the entire metal detector. [0003] There are three sets of coils distributed inside the sensor probe of the traditional metal detection sensor. The three sets of coils are the central transmitting coil and two equivalent receiving coils. The electromagnetic wave generator connected to the ...

AI Technical Summary

Problems solved by technology

This kind of metal detection sensor adopting the principle of balanced coil has the disadvantages of poor anti-interference, weak stability, and prone to malfunction.

[0004] Chinese patent document CN 2815506Y discloses a "Gyromagnetic Metal and Nonmetal Separator", which provides a separator that can separate metal and nonmetal materials with similar volumes, which improves the separation efficiency to a certain extent. It reduces the labor intensity of workers, but this metal separator has shortcomings: first, it can only separate metals and non-metallic materials with similar volumes, and cannot separate tiny metal particles, and the separation accuracy is not high; secondly, only Can separate ferrous metals that can be attracted by magnetic strips, but cannot separate other metals, and the separation efficiency is relatively low

[0005] At present, there are relatively complete series of products in metal detection abroad, such as the German S+S metal detection and separation device, which has high sensitivity and good reliability, but the price is extremely expensive.

At present, metal detection devices produced by some domestic manufacturers are still plagued by many technical problems during use, such as physical vibration, voltage fluctuations, external radio wave interference, etc., the measurement accuracy is not high, the field interference is too large, and the measurement results Distortion, possible fluctuations in sensitivity to sense metallic foreign objects

Images