The structure and application of food metal detector

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A metal detector is an instrument specifically used to detect metals. In addition to detecting mines with metal shells or metal parts, it can also be used to detect wires hidden in walls, water pipes and cables buried in the ground, and even Be able to explore treasure underground and find metal objects buried in the ground. Metal detectors can also be used as tools for youth national defense education and popular science activities, and of course it is also an interesting entertainment toy.


Structure and composition

A typical food metal detector consists of the following four main components:

Detection head

The detector coil is also called the detector head. It has a built-in "balanced coil". Three coils are wound on a non-metal frame or a former. The coils are completely parallel to each other. The coil in the middle generates a magnetic field through high-frequency current. The two coils on both sides of the middle coil are receiving coils. Since these two coils are exactly the same and keep the same distance from the transmitter, their induced electromotive force is exactly the same.

 food metal detector

When these coils are connected in reverse, the electromotive force cancels each other out, thus forming a "zero output", that is, reaching a state of equilibrium. Then it is poured with cement to ensure that when no product passes through, the magnetic field is in a dynamic equilibrium state, and is not affected by external environments such as temperature changes, vibration, and electromagnetic interference. During detection, the product passes through three coils one after the other. If it contains metal foreign objects, the balance of the magnetic field will be broken and induced current is generated to detect various metal foreign objects.


Control Panel

The user interface/control panel, commonly including touch screen type and button type, is generally installed directly on the detection head. However, if the sensor head is too small, or is installed in an inconvenient or inaccessible place, it can be installed remotely using a connecting cable.


Transmission system

The food metal detector transmission system is used to make the product pass through the opening. The most commonly used conveying device is the horizontal conveyor belt type. At the same time, for different product applications, you can choose the gravity drop type (powder or particles transported in the pipeline) or the horizontal pipeline type (liquid and fluid) And the plastic guide groove commonly used in the pharmaceutical industry.

 food metal detector

Automatic rejection system

The automatic rejection system is used to reject any infected products out of the production line, usually installed on the transmission system. There are many different types, including blowing type, push rod type, flap type and so on. The type of rejection system will depend on the product that needs to be tested.



Mainly used in: sauces, sausages, dumplings, ham, soup, candy, preserved food, salted food, fast food, food additives, starch, glucose, tobacco, fresh meat, dairy products and other industries, suitable for strong Product testing for product effects and other industries that have extremely high requirements for detection sensitivity, anti-interference ability and waterproofing. It is used to detect broken needles, iron wires or lead, copper, aluminum, tin, Various metals such as stainless steel.


If you are interested in our food metal detectors, you can contact us. We at JKDC also produce a lot of products. If you need them, you can visit our website.




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