A frequency-adjustable constant magnetic field demagnetizer

Abstract

The invention provides an adjustable-frequency constant magnetic field demagnetizer. The adjustable-frequency constant magnetic field demagnetizer consists of an alternating-current power supply, a circuit breaker protector, a transformer, a rectifying bridge, a switch element, a demagnetizing coil, a control transformer, a control power supply, a compensation system, a CPU plate, a feedback module, a protection system and a sensor; two IGBT modules are used as the switch element, and the CPU plate is used for providing the power supply which is alternately switched on by two circuits of high level and low level to the two switch elements, so that the switch elements can be alternately switched on, and the switch-on frequency can be adjusted. The adjustable-frequency constant magnetic field demagnetizer can substitute the traditional demagnetizer on the market and is high in applicability, and the field requirement can be met by adjusting the magnetic field of a demagnetizing coil according to different materials.

Description

technical field [0001] The invention belongs to the technical field of magnetic separation machinery, in particular to the technical field of demagnetization, and relates to a constant magnetic field demagnetizer with adjustable frequency, which is applicable to various working sites with adjustable frequency. Background technique [0002] According to the existing technology, the energy consumption of ball mill grinding accounts for more than 60% of the total energy consumption of ore beneficiation in the beneficiation process, and in the crushing stage before ore grinding, the ore enters the bulk pre-selection and throws tails to reduce the waste rock entering the mill can be greatly reduced Reduce the energy consumption of ore dressing and improve the effective grinding efficiency of the ball mill. However, after the strong magnetic minerals are pre-thrown by magnetic separation, there is residual magnetism in the minerals, and it is easy to form magnetic agglomeration af...

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Problems solved by technology

[0006] However, it is applicable to the actual needs of different working conditions on site. For the demagnetizer applied for in Chinese Patent No. 200520092075, which is superior to the traditional demagnetizer, no matter whether it is two demagnetization coils plus two capacitors, two alternating LC oscillations are formed. Demagnetization is carried out by a demagnetization circuit, or the demagnetization is directly connected to the demagnetization coil by alternating current, or the frequency adjustable demagnetizers currently on the market, all of which have unfavorable phenomena such as instability and high energy consumption during work.

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