JPH0510999U - Bottom electrode in DC arc furnace - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a bottom electrode in a DC arc furnace that can prevent the local wear of the furnace wall and uniformly heat the material to be heated without requiring an extra space. It is provided. According to the present invention, a plurality of electrode pins that are inserted into the bottom of a furnace are arranged in a donut shape as a whole, and the electrode pins are a donut-shaped conductive plate as a whole lacking a part outside the furnace. It is characterized in that a power feeding conductor is connected to one end of the conductive plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bottom electrode in a DC arc furnace. The DC arc furnace is equipped with a top electrode (cathode) and a bottom electrode (anode). The furnace bottom electrode is classified into an air-cooled multi-pin type and a water-cooled mold type, depending on the difference in the cooling mechanism for suppressing the consumption. The present invention relates to improvement of an air-cooled multi-pin type bottom electrode.

[0002]

[Prior Art]

 In a DC arc furnace, when a DC voltage is simply applied between both electrodes, the arc generated is deflected in one direction under the influence of electromagnetic force, and the furnace wall in that deflection direction is locally worn. Therefore, conventionally, in order to prevent such arc deflection and generate an arc in the vertical direction between both electrodes, a power supply conductor connected to the electrodes is arranged horizontally (actual open flat 2-24290) or for power supply. A horizontal arrangement of conductors surrounding electrodes (Japanese Patent Publication 1-52673) has been proposed.

However, the above-mentioned conventional proposals require a correspondingly large space for horizontally disposing the power feeding conductor, and the arc is concentrated in the vertical direction between both electrodes. It has a drawback that it cannot uniformly heat a metallic material, which is a heating material.

[0004]

[Problems to be solved by the device]

 The problem to be solved by the present invention is that the conventional proposal requires a correspondingly large space, and the material to be heated cannot be uniformly heated.

[0005]

[Means for Solving the Problems]

 In the present invention, however, a plurality of electrode pins that are inserted into the bottom of the furnace are arranged in a donut shape as a whole, and the electrode pins are a donut-shaped conductive plate that is partly lacking outside the furnace. The present invention relates to a bottom electrode in a DC arc furnace, wherein the bottom electrode is attached to an electric power supply conductor and is connected to one end of the conductive plate.

The bottom electrode of the present invention is of the air-cooled multi-pin type. The plurality of electrode pins are arranged in a donut shape as a whole. The electrode pin is attached to a doughnut-shaped conductive plate as a whole, a part of which is removed outside the furnace, and a power supply conductor is connected to one end of the conductive plate.

[0007]

[Action]

 When a DC voltage is applied between the furnace top electrode and the plurality of electrode pins that are the bottom electrode, the plurality of electrode pins are arranged in a donut shape as a whole, and the plurality of electrode pins are electrically connected to each other. Since the plate is formed in a donut shape as a whole with a part of it missing, the electromagnetic force acting in the direction of the side wall of the furnace body turns, and the arc turns under the influence of the electromagnetic force. As a result, local wear of the furnace wall can be prevented, and the material to be heated can be uniformly heated due to the stirring effect. Moreover, since the conductive plate is stored outside the furnace bottom, no extra space is required.

[0008]

【Example】

 1 is a longitudinal sectional view of an essential part schematically showing an embodiment of the present invention in relation to a DC arc furnace, and FIG. 2 is a bottom view of an essential part schematically showing the same embodiment. The DC arc furnace 11 is equipped with a furnace top electrode 21 and an air-cooled multi-pin type furnace bottom electrode 31, and the furnace bottom electrode 31 is provided with a plurality of electrode pins 41, a conductive plate 51 and a power supply conductor 61. . The electrode pins 41 are inserted into the furnace bottom 12 and are arranged in a donut shape as a whole, and their base ends are attached to a conductive plate 51 outside the furnace. The conductive plate 51 is formed in a donut shape as a whole with a part thereof omitted, and an insulating material 71 is interposed in the missing part. The power supply conductor 61 is connected to one end of the conductive plate 51, a portion of which is missing.

[0009]

[Effects of the Invention] As is apparent, the present invention described above has the effect of preventing localized wear on the furnace wall and requiring uniform heating of the material to be heated, without requiring an extra space. There is.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part schematically showing an embodiment of the present invention in relation to a DC arc furnace.

FIG. 2 is a bottom view of a main part schematically showing the same embodiment.

[Explanation of symbols]

11 ... DC arc furnace, 21 ... furnace top electrode, 31 ...
..Furnace bottom electrodes, 41 ... Electrode pins, 51 ... Conductive plates, 61 ... Power supply conductors

Claims (1)

[Claims for utility model registration] [Claim 1] A plurality of electrode pins inserted into the furnace bottom are arranged in a donut shape as a whole, and the electrode pins are partially removed outside the furnace. A bottom electrode in a DC arc furnace, wherein the bottom electrode is attached to a doughnut-shaped conductive plate, and a power supply conductor is connected to one end of the conductive plate.