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The industrial metal detector is intended for detection of foreign metallic impurities in raw materials, semi-finished products and finished goods.
Accordingly, conveyor metal detectors are designed to detect foreign ferromagnetic inclusions in the flow of raw materials transported on conveyor belts.
The use of these devices ensures the safety of products of processing and equipment from falling into them random bodies containing magnetic and non-magnetic metals.
Role in production
Industrial metal detectors allow to determine presence of metal objects in the form of details of machines and mechanisms, wire, foil, elements of clothes and ornaments, stationery, tool, shavings, wear of cutting and crushing Equipment, etc.
Automatic rejection systems are used to ensure that the production process does not suffer from stops to find and remove metallic impurities in the flow. After receiving a signal from the metal detector about the presence in the product of an external metal body, the rejection device is given a command to trigger. The "contaminated" volume of raw materials or finished products is deduced from the general flow. In the future from the rejected materials metal objects are either extracted manually or disposed together with a useful product. In cases where the metal is magnetic, the cleaning of the magnetic separators is carried out and the useful product is returned to production from the iron.
The designs of the rejection devices are produced using mechanical tray elements, reducing the conveyor length or using a compressed air jet. The choice of device type is determined by the specialists of the NGO "Erga" based on the requirements of the technological process at the customer's enterprise.
How it works
Most metal detectors work according to the following principle. On the transmitting coil of the metal detector is supplied alternating current, which forms around it "reference" variable magnetic field. At the same time the alternating current, fixed in size and phase, is brought on the receiving reel. When entering this field of metal object in the latter are induced eddy currents, which create their own magnetic field of the object, changing "reference". This change in the field results in a change in the value and phase of the current in the receiving coil and is fixed by the Signal Processing unit.
It should be noted that the pulse has many advantages: high sensitivity, weak reaction to the composition of the controlled product, simple construction. This principle is well-coordinated with the use of high-speed microcontrollers (DSP), allowing complex mathematical processing of the signal in real time.
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