An energy-saving AC demagnetization device and method for electromagnetic detection of ferromagnetic tubes and rods

Abstract

The invention discloses an energy-saving AC demagnetization device and method for electromagnetic detection of ferromagnetic tubes and rods. The device includes a demagnetizer, a current controller, a photoelectric sensor, and a magnetic sensor. The negative feedback method is used to monitor the workpiece by the magnetic sensor The surface magnetic field strength, when the magnetic field strength reaches the demagnetization requirement, it will be fed back to the current controller in time, stop increasing the demagnetization current, and stop sending current to the demagnetizer when there is no load (that is, no workpiece). In this way, the purpose of automatically controlling the demagnetization current is realized, and the beneficial effects of ensuring the demagnetization effect, reducing energy consumption and protecting the reliability of equipment are achieved.

Description

Technical field [0001] The present invention relates to a non-destructive detection device and method, and more particularly to an energy-saving AC demagnetization apparatus and method for electromagnetic detection of ferromagnetic rods. Background technique [0002] At present, the AC retirement in the market is generally composed of the air core copper coil. It is mainly used for the returning treatment after the eddy current of the ferromagnetic material. In order to ensure different specifications, the tube, the rod, the wire is passed, and it can obtain effective dendys. Effect, usually applies a sufficiently large AC current, thereby easily generating a coil fever, increased power consumption, which is not conducive to the long-term stability of the devilizer. In view of the general steel manufacturers, they should be adapted to certain range of product specifications, and designers are designed to meet the maximum specific requirements, the production line workers are gene...

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Problems solved by technology

[0002] The AC demagnetizers currently on the market are generally composed of air-core copper coils, which are mainly used for demagnetization treatment after eddy current or magnetic flux leakage inspection of ferromagnetic materials. In order to ensure that tubes, rods and wires of different sizes can be effectively demagnetized when they pass As a result, it is usually necessary to apply a sufficiently large AC current, which is likely to generate heat in the coil and increase power consumption, which is not conducive to the long-term stable operation of the demagnetizer

In view of the fact that the same production line of general iron and steel manufacturers must adapt to a certain range of product specifications, and designers design to meet the maximum specification requirements, production line workers generally want to be convenient, and are unwilling to test and modify demagnetization current parameters in time, resulting in excessive residual magnetism or power loss. waste, reduced equipment reliability

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