Aluminum solution stirring device of air-cooled composite magnetic field

Abstract

The invention discloses an aluminum solution stirring device of an air-cooled composite magnetic field. The aluminum solution stirring device comprises a rotating shaft which is vertically arranged on a frame, wherein the bottom end of the rotating shaft is connected with a power device; a magnetic yoke of which the upper plane inclines outwards is arranged at the upper end of the rotating shaft;at least two grid-type direct-current coils which are annularly distributed uniformly at intervals and are vertical to the upper plane are arranged on the upper plane; an iron core is arranged in each grid-type direct-current coil; the equidirectional ends of every two adjacent iron cores have opposite polarities; a high-temperature-resistant permanent magnet of which the polarity is repellent tothat of the upper end of each iron core is arranged between every two grid-type direct-current coils; the outer side of each grid-type direct-current coil is provided with an air cooling device; and a non-magnetic outer cover is arranged above the frame. The stirring device disclosed by the invention has a large acting range on an aluminum solution in an aluminum smelting furnace under the actionof a composite magnetic field formed by the coaction between an electromagnetic field and a permanently-magnetic field; the height and the intensity of a magnetic line of force are enhanced; and the aluminum solution stirring device has large permeation depth on the aluminum solution, large magnetic field force, large stirring force, high efficiency for stirring and a wide application range.

Description

technical field [0001] The invention relates to the technical field of non-contact stirring equipment in aluminum smelting, in particular to an air-cooled composite magnetic field aluminum solution stirring device installed at the bottom of an aluminum smelting furnace. Background technique [0002] During the aluminum smelting process, in order to speed up the melting speed and make the alloy composition uniform after adding the alloy, it is necessary to periodically stir the molten aluminum in the furnace. The currently used non-contact stirring methods are: AC excitation stirring, permanent magnetic stirring and DC excitation stirring. AC excitation stirring is to use multiple coils placed in parallel, and use the periodic current phase difference method to form a traveling wave magnetic field to stir the molten aluminum. The problem with this stirring method is: large power consumption, a 30-ton aluminum melting furnace Using an AC excitation stirrer consumes 250-315 ki...

AI Technical Summary

Problems solved by technology

AC excitation stirring is to use multiple coils placed in parallel, and use the periodic current phase difference method to form a traveling wave magnetic field to stir the molten aluminum. The problem with this stirring method is: large power consumption, a 30-ton aluminum melting furnace Using an AC excitation stirrer consumes 250 kW to 315 kW per hour, and the mechanism is complex and the failure rate is high

Due to the use of a large number of high-temperature-resistant magnetic materials for permanent magnetic stirring, although the power consumption is only one-tenth to one-fifteenth of that of AC excitation stirring, the magnetic material contains many rare metals, which are rare earth materials mined under state control. Expensive, compared with the same tonnage of AC excitation stirring, the cost is more than twice that of AC excitation stirring, which limits its development to a certain extent

The DC excitation stirrer adopts the form of parallel discharge of DC coils, there is no repulsive magnetic pole in the middle, and the magnetic force lines form the shortest loop. Although the power consumption is only about one tenth of that of the AC excitation stirrer, the magnetic field radiation area, depth and intensity are smaller. Small, the stirring range and the amount of aluminum solution to be stirred are small; moreover, because the DC coil adopts solid winding and natural cooling, the heat dissipation of the coil is slow, easy to overheat, the magnetic attenuation is large, and the excitation power should not be increased, so it can only be applied to small furnaces and It is used when the furnace bottom is thinner, and the application range is narrow

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