KR20170015628A

KR20170015628A - Electrode for electric furnace

Info

Publication number: KR20170015628A
Application number: KR1020150107409A
Authority: KR
Inventors: 류재왕
Original assignee: 주식회사 포스코
Priority date: 2015-07-29
Filing date: 2015-07-29
Publication date: 2017-02-09

Abstract

An embodiment of the present invention provides an electrode rod for an electric furnace which prevents current density from being raised by increasing a contact area of an electrode connection portion. According to an aspect of the present invention, the electrode rod for the electric furnace comprises: first and second electrode rods coupled to each other with a nipple as a medium; and a conductive fluid supply unit provided in at least one of the first and second electrode rods coupled to each other, supplying a conductive fluid to a gap between at least one of the coupled electrode rods and the nipple.

Description

[0001] ELECTRODE FOR ELECTRIC FURNACE [0002]

The present invention relates to an electrode rod for an electric furnace used for forming a flame in an electric furnace.

Generally, an electric furnace supplies a large current through an electrode rod, and dissolves the scrap using arc heat generated between the electrode rod and the scrap. Electrodes are continuously consumed in the process of forming an arc, so they are connected and connected continuously.

On the other hand, the electrode may have a smaller contact area of the connection part connected to the other electrode than the other part, and the current density may increase at the electrode connection part and heat may be generated. In this way, the electrode connection portion of the electrode rod can change the material of the glowing portion.

In addition, in the operation of the electric furnace, the process of the electrode rod being reddried as the electric current is supplied, and the process of cooling the electrode rod in the non-operation of the electric furnace may be repeated so that the connection of the electrode connection portion can be loosened, The electrode connection portion is frequently broken due to the vibration generated at the time electrode.

Accordingly, it is required to develop a technique for preventing an increase in the current density by increasing the contact area of the electrode rod for the electric furnace with respect to the electrode connection portion, but there is still room for further improvement.

Korean Patent Application No. 10-1996-0000698 (1996.01.16) Korean Patent Application No. 10-1994-0000689 (Jan. 17, 1994)

An object of the present invention is to provide an electrode rod for an electric furnace which increases a contact area of an electrode connection portion to prevent an increase in current density.

An electrode rod for an electric furnace according to an aspect of the present invention includes first and second electrode rods fastened to each other via a nipple; And a conductive fluid supply unit for supplying a conductive fluid between the at least one electrode rod and the nipple provided in at least one of the first and second electrode cooperating with each other.

The first and second electrode rods may have first and second nipple grooves corresponding to the first and second electrode rods, respectively. The conductive fluid supply unit may include at least one of the first nipple groove and the second nipple groove, So that the conductive fluid can be discharged to the space between the nipple and the first nipple groove or the second nipple groove when the nipple is coupled to the nipple.

The conductive fluid supply portion may include a recessed portion formed in an end portion of at least one of the first nipple groove and the second nipple groove, and a second recessed portion provided on at least one end of the nipple to be inserted into the recessed portion, And a pressing protrusion for pressing the nipple to be discharged into the space between the first nipple groove or the second nipple groove.

The conductive fluid supply portion is inserted into the recessed portion, the conductive fluid is stored therein, and a portion exposed through the recessed portion is covered with the membrane member, so that when the nipple is engaged, And a storage container in which the conductive fluid is torn and the conductive fluid is discharged.

In addition, the conductive fluid supply unit may be filled with the conductive fluid at the end of at least one of the first nipple groove and the second nipple groove, and may be pushed out into a gap around the nipple when the nipple is coupled.

In addition, the conducting fluid may comprise a conductive grease.

The apparatus may further include an area increasing unit provided at an end of the first electrode or the second electrode which is in contact with the electrode.

Here, the area increasing unit may include a plurality of circular protrusions formed concentrically on one end surface of the first electrode bar or the second electrode bar, and a plurality of circular protrusions formed on the other end surface of the first electrode bar or the second electrode bar And a plurality of circular receiving grooves formed to receive and contact the circular protrusions.

According to another aspect of the present invention, there is provided an electrode rod for an electric furnace, comprising: first and second electrode rods fastened to each other via a nipple; And an area increase unit provided at an end of the first electrode or the second electrode that is in contact with the electrode.

The first and second electrode rods may be formed with first and second nipple grooves to which the nipple is fastened. The area increasing portion may include a plurality of concentric circles And a plurality of circular receiving grooves formed on an end surface of the other of the first electrode bar and the second electrode bar to receive and contact the circular protruding portion.

According to an embodiment of the present invention, it is possible to improve the contact area of the electrode connection portion, thereby preventing the current density from rising, preventing the occurrence of the red-hot phenomenon and minimizing the electrode loss, As a result, the production cut-off time and the trouble-shooting time due to electrode breakage can be reduced, thereby improving the overall production and economical efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an electrode in an electric furnace according to an embodiment of the present invention. FIG.
2 is a front view of an electrode rod for an electric furnace according to an embodiment of the present invention;
FIG. 3 is an enlarged cross-sectional view of a part of an electrode rod for an electric furnace according to an embodiment of the present invention; FIG.
4 is an enlarged cross-sectional view showing a state immediately before the electrode rod for an electric furnace is coupled according to an embodiment of the present invention.
FIG. 5 is an enlarged cross-sectional view illustrating a state in which an electrode rod for an electric furnace is coupled according to an embodiment of the present invention; FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. The shape and the size of the elements in the drawings may be exaggerated for clarity and the same elements are denoted by the same reference numerals in the drawings.

FIG. 2 is a front view of an electrode rod for an electric furnace according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of an electric rod according to an embodiment of the present invention. Fig. 5 is an enlarged cross-sectional view of a part of an electric furnace electrode according to an embodiment of the present invention. FIG. 4 is an enlarged cross-sectional view of an electrode rod for an electric furnace according to an embodiment of the present invention, and FIG. 5 is an enlarged view of an electrode rod for an electric furnace according to an embodiment of the present invention Section

1 to 3, the electrode rod 100 for an electric furnace according to the present embodiment can be utilized to generate an arc A to dissolve the steel material 20 such as scrap stored in an electric furnace.

The electrode rod 100 for an electric furnace can be worn during the process of generating the steel material 20 and the arc A such as scrap in the melting process of the electric furnace 10 and accordingly the electrode arm 30 is used down have. On the other hand, if the arc arm A can not be generated even when the electrode arm 30 is lowered, a new electrode assembly may be assembled on the upper side using an electrode assembly.

For example, the length of the electrode rod 100 is about 2,400 mm, and the electrode rod 100 having a diameter of 600 mm is connected to a maximum of three. When the electrode rod 100 is worn to have a length of about two, (A) by continuously connecting the arc lamps (100).

The electrode rod 100 may include a first electrode rod 110 and a second electrode rod 130 connected to the first electrode rod 110. The first electrode rod 110 and the second electrode rod 130 may include a nipple (Not shown).

To this end, a first nipple groove 112 for coupling the nipple 150 may be formed at an end of the first electrode rod 110. A second nipple groove 132 may be formed at an end of the second electrode rod 130 to correspond to the first nipple groove 112 of the first electrode rod 110.

The nipple 150 is a frusto-conical member formed in both directions, and a first helical groove 152 may be formed on the outer circumferential surface. The second helical groove 114 and the third helical groove 134 may be formed in the first nipple groove 112 and the second nipple groove 132, respectively.

The first helical groove 152 is engaged with the second helical groove 114 and the third helical groove 134 of the first nipple groove 112 and the second nipple groove 132, The electrode rod 110 and the second electrode rod 130 can be integrally coupled.

Meanwhile, the electrode rod 100 of the present embodiment may include a conductive fluid supply unit 140 provided in at least one of the first nipple groove 112 and the second nipple groove 132.

The conduction fluid supply unit 140 may be configured such that the first electrode rod 110 and the second electrode rod 130 are connected to the nipple 150 and the first nipple groove 112 or the second nipple groove 132, The conductive fluid P can be supplied to the space between the first electrode rod 110 and the second electrode rod 130 to increase the contact area as the gap is filled with the conductive fluid P. Accordingly, it is possible to disperse the current delivered to the connection portion, and increase of the current density can be suppressed as the transfer area increases.

In this embodiment, the conductive fluid supply part 140 may include a recessed part 142 provided at an end of at least one of the first nipple groove 112 and the second nipple groove 132, Groove portion 142 may be filled.

Further, the nipple 150 may have a pressing protrusion 154 formed on at least one end thereof. The pressing protrusion 154 may be provided to be inserted into the recessed portion 142. When the nipple 150 is coupled to the first electrode rod 110 or the second electrode rod 130, The conductive fluid P filled in the recessed portion 142 can be pushed into the space between the nipple 150 and the first nipple groove 112 or the second nipple groove 132 as it is inserted into the groove portion 142 .

In this embodiment, the conduction fluid supply part 140 may be provided in a state filled with the recessed part 142, but the configuration of the conduction fluid supply part 140 is not limited and may be variously changed.

For example, the conduction fluid supply part 140 may further include a storage container 144 in which the conduction fluid P inserted into the recessed part 142 is stored.

The portion of the storage container 144 that is exposed to the outside through the recessed portion 142 in a state where the storage container 144 is inserted into the recessed portion 142 may be provided in a state covered with the film member 146. That is, the storage container 144 may be provided in a shape corresponding to the recessed groove 142, and the end exposed after being inserted into the recessed groove 142 is blocked by the membrane member 146, (P) can be prevented from being discharged to the outside.

The membrane member 146 is attached to the end portion of the nipple 150, preferably the end portion of the nipple 150, in the process of inserting the nipple 150 into the first nipple groove 112 or the second nipple groove 132. [ It can be provided to discharge the conductive fluid P torn by the provided pressing projection 154 and stored therein.

At this time, the conductive fluid P filled in the end of at least one of the first nipple groove 112 or the second nipple groove 132 passes through the nipple 150 and the first nipple groove 112 or the second nipple groove 132, And the contact between the first electrode rod 110 and the second electrode rod 130 can be provided in an amount sufficient to fill the connection portion.

The conductive fluid P may be a fluid having a predetermined viscosity so that the electrode rod 100 does not flow out during storage or movement of the electrode rod 100. As the conductive fluid P, a conductive grease is typically used It is also possible to use a conductive grease containing a carbon component or a silver component for improving the conductivity.

Meanwhile, in the present embodiment, the first electrode rod 110 and the second electrode rod 130 may be brought into close contact with each other in the process of coupling the electrode rod 100 with the nipple 150.

Preferably, in the present embodiment, a contact portion of the first electrode rod 110 or the second electrode rod 130 may be provided with an area increasing portion for increasing the contact area.

For example, the area increasing portion may include a plurality of circular protrusions 116 arranged in a concentric circle formed on one of the first electrode bar 110 and the second electrode bar 130.

A plurality of circular receiving grooves 136 may be formed concentrically in correspondence with the circular protruding portions 116 on the other end surface of the first electrode rod 110 or the second electrode rod 130.

The circular protrusion 116 may be received and brought into contact with the circular receiving groove 136 in a process in which the first electrode rod 110 and the second electrode rod 130 are brought into contact with each other.

The circular protrusions 116 and the circular receiving grooves 136 are formed in a triangular shape. Alternatively, the circular protrusions 116 and the circular receiving grooves 136 may be formed in a semicircular shape, a square shape, or a trapezoidal shape. And may be formed in various forms such that the electrode rod 130 is in close contact with each other when the electrode rod 130 is abutted.

For example, the circular protrusion 116 is formed in the first electrode rod 110 and the circular receiving groove 136 is formed in the second electrode bar 130 in the present embodiment. However, the first electrode rod 110, A circular protrusion 116 may be formed in the second electrode bar 130 and a circular protrusion 116 may be alternately formed in the first electrode bar 110 and the second electrode bar 130, 116 and the circular receiving groove 136 may be formed.

The circular receiving groove 136 and the circular protruding portion 116 can increase the contact area of the first electrode rod 110 and the second electrode rod 130 compared to the case where the end faces of the first electrode rod 110 and the second electrode rod 130 are flat, The current can be dispersed and transmitted as the gap is filled. Accordingly, the increase of the current density can be minimized as the transfer area increases.

Although the conductive fluid supply unit 140 is described as being provided between the first electrode rod 110 and the nipple 150 in the present embodiment and the drawings, the same structure is also provided between the second electrode rod 130 and the nipple 150 The gap between the second electrode rod 130 and the nipple 150 can be filled with the conductive fluid P (P) in the process of coupling the second electrode rod 130 with the nipple 150. [ ). &Lt; / RTI >

The operation of the electrode rod 100 for an electric furnace constructed as described above will be described below.

First, an electric arc furnace 10 forms an arc A on a steel material 20 including a scrap by supplying an electric current to an electrode rod 100 coupled to the electrode arm 30, for example, the first electrode rod 110 The steel material 20 is dissolved.

The first electrode rod 110 may be abraded during the melting of the steel material 20 and the electrode cylinder 30 may be lowered to maintain the first electrode rod 110 at a certain distance from the steel material 20 .

The first electrode rod 110 may not maintain a predetermined distance from the steel material 20 only by lowering the electrode arm 30 according to the increase of the wear of the first electrode rod 110, ) To allow continuous dissolution work.

At this time, the nipple 150 is rotated and coupled to the second nipple groove 132 provided at the end of the second electrode rod 130.

The second electrode rod 130 coupled to the nipple 150 is rotated with respect to the first electrode rod 110 so that the nipple 150 is inserted into the first nipple groove 112 of the first electrode rod 110, do.

The nipple 150 can be inserted into the first nipple groove 112 by being rotated by being inserted into the first nipple groove 112 in the process of being inserted into the first nipple groove 112. The pressing protrusion 154 formed at the end of the nipple 150 preferably at the end of the nipple 150 can be inserted into the recessed portion 142 of the first nipple recess 112, The filled conductive fluid P, for example, grease may be supplied to fill the gap between the nipple 150 and the first nipple groove 112.

The reservoir 144 filled with the conductive fluid P may be inserted into the recess 142 and the press protrusion 154 may be coupled while piercing the membrane member 146 covering the reservoir 144 The conductive fluid P stored in the storage container 144 is discharged through the gap between the nipple 150 and the first nipple groove 112. [

The first electrode rod 110 and the second electrode rod 130 are connected to each other by a plurality of circular protrusions 116 and a plurality of corresponding circular recesses 136 formed in a cross- Are engaged with each other and the contact area is increased.

More preferably, the conductive fluid P filled in the recessed portion 142 or the storage container 144 is filled with the gap between the nipple 150 and the first nipple recess 112, (136) so as to fill the gap.

In the present embodiment, the conductive fluid P may be stored directly in the recessed portion 142 provided at the end of the first nipple groove 112 or the second nipple groove 132, The shape or position of the conduction fluid P is not limited and may be variously modified.

The conduction fluid supply part 140 is provided with a structure in which the conduction fluid P is directly filled in at least one end of the first nipple groove 112 or the second nipple groove 132 .

That is, the conductive fluid supply part 140 may be filled with the conductive fluid P at the end of at least one of the first nipple groove 112 and the second nipple groove 132, at which time the nipple 150 is inserted As the at least one end of the first nipple groove 112 or the second nipple groove 132 is pressed, the conductive fluid P filled in the end portion can be provided in a structure in which it is pushed out through a gap in the peripheral portion.

The conductive fluid P may be in a solid state in a state of being filled in at least one end of the first nipple groove 112 or the second nipple groove 132 and may be phase- Do.

The conductive fluid P may be a fluid having a predetermined viscosity so that the electrode rod 100 does not flow out during storage or movement of the electrode rod 100. Grease may be used as the conductive fluid P have.

It is also possible that the conducting fluid P is applied in the state of being applied to the second helical groove 114 of the first nipple groove 112 or the third helical groove 134 of the second nipple groove 132, It is also possible to provide various positions and configurations for receiving a pressing force in the process of coupling the nipple 150 to the first nipple groove 112 or the second nipple groove 132.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. It will be clear to those who have knowledge.

100: electrode rod for electric furnace 110: first electrode rod
112: first nipple groove 116: circular protrusion
130: second electrode rod 132: second nipple groove
136: Circular receiving groove 140: Conductive fluid supply part
142: recessed groove 144: storage container
146: membrane member 150: nipple
154: pressing projection P: conducting fluid

Claims

First and second electrode rods fastened to each other via a nipple; And
A conduction fluid supply unit for supplying a conduction fluid between at least one electrode rod and the nipple provided on at least one of the first and second electrode rods to be coupled to each other;
And an electrode for an electric furnace.

The method according to claim 1,
Wherein one end of each of the first and second electrode rods is formed with corresponding first and second nipple grooves to which the nipple is fastened,
Wherein the conductive fluid supply portion is provided in at least one of the first nipple groove and the second nipple groove so that the conductive fluid is supplied to the space between the nipple and the first nipple groove or the second nipple groove upon nipple groove coupling of the nipple, And an electrode for an electric furnace.

3. The apparatus of claim 2, wherein the conduction fluid supply
A recessed portion formed at an end of at least one of the first nipple groove and the second nipple groove,
A pressing projection which is provided at at least one end of the nipple and is inserted into the groove and which pressurizes the conductive fluid to discharge the space between the nipple and the first nipple groove or the second nipple groove;
And an electrode for an electric furnace.

4. The apparatus of claim 3, wherein the conduction fluid supply portion
The conductive fluid is stored in the recessed portion, and the exposed portion of the conductive fluid is covered with the membrane member. When the nipple is coupled, the membrane member is torn by the pressing protrusion, and the conductive fluid is discharged The electrode rod for an electric furnace further comprising a storage container.

3. The apparatus of claim 2, wherein the conduction fluid supply
Wherein at least one end of the first nipple groove or the second nipple groove is filled with the conductive fluid so that the nipple is pushed out by a gap in the periphery when the nipple is coupled.

The method according to any one of claims 1 to 5,
Wherein the conductive fluid comprises a conductive grease.

The method according to any one of claims 1 to 5,
And an area increasing unit provided at an end of the first electrode rod or the second electrode rod which is in contact with the electrode rod.

[8] The apparatus of claim 7,
A plurality of circular protrusions formed to be concentrically arranged on a cross section of one of the first electrode bar and the second electrode bar,
A plurality of circular receiving grooves formed on the other end face of the first electrode bar or the second electrode bar to receive and form the circular protrusions;
And an electrode for an electric furnace.

First and second electrode rods fastened to each other via a nipple; And
An area increasing unit provided at a contact end of the first electrode or the second electrode;
And an electrode for an electric furnace.

The method of claim 9,
Wherein the first and second electrode rods are formed with first and second nipple grooves to which the nipples are fastened,
The area increasing unit may include a plurality of circular protrusions formed to be concentrically arranged on one end face of the first electrode bar or the second electrode bar,
A plurality of circular receiving grooves formed on the other end face of the first electrode bar or the second electrode bar to receive and form the circular protrusions;
And an electrode for an electric furnace.