KR20170112722A - electrode slipping apparatus and electric furnace - Google Patents

Abstract

The present invention provides an electrode pressing apparatus. The electrode reduction device of the present invention comprises: a main frame surrounding an electrode; A lower clamping unit having at least two or more first clamping modules installed at equal intervals on the main frame and clamping and unclamping the electrode rod; An upper clamping unit having at least two second clamping modules spaced apart from the upper portion of the lower clamping unit and equidistantly installed, the upper clamping unit clamping and unclamping the electrode rod; And lowering cylinder units positioned between the lower clamping unit and the upper clamping unit to up-down the upper clamping unit.

Description

[0001] The present invention relates to an electrode slipping apparatus and an electric furnace,

The present invention relates to an electric furnace, and more particularly, to an electrode reduction apparatus for clamping / unclamping an electrode rod of an electric furnace to continuously charge the electrode rod into the main body, The present invention is an improvement for improving the performance of the apparatus.

Generally, the electrode reduction device of an electric furnace has a role of reducing the length of the electrode rod by a length consumed during the steelmaking process, and a holder for holding the electrode rod. The electrode reduction device mainly comprises a lower clamping unit and an upper clamping unit.

The electrode reduction device is positioned at the top of the electrode rod 102 exposed from the mantle. The upper clamping unit performs an operation of clamping / unclamping the electrode rod and a pushing operation of moving the electrode rod under a predetermined interval in a clamped state.

10 is a view showing a conventional electrode pressing apparatus.

Referring to FIG. 10, in the conventional electrode reduction apparatus, the cotter operates the clamp by the operation of the clamping / unclamping cylinder, and the clamp operates by tightening / loosening the steel band.

The conventional electrode pressing apparatus has the following problems.

First, since the conventional electrode press-down device performs both clamping and unclamping by using hydraulic pressure, when the hydraulic line is in trouble during clamping or when an emergency situation such as power failure occurs during unclamping operation, clamping is not performed Occurs. If the electrode is not clamped, it may cause slip of the electrode and / or severance of the electrode.

Second, in the conventional electrode press-down device, the piping resistance to each pressing cylinder and the load applied to each cylinder are different. Therefore, when the pressure is lowered and when the upper clamping unit is lifted up, the respective four cylinders are not adjusted in the same manner. The unbalance of the hydraulic line caused the breakdown.

Third, the conventional electrode pressing apparatus has a complicated internal structure and a lot of processing, which increases the production cost (processing cost, production cost), and there are many fault occurrence points due to the complicated configuration, and it is difficult to repair or replace the apparatus when a fault occurs. It is difficult to disassemble / reinstall because bracket is welded to install various accessories (sensors, etc.).

Korean Patent Publication No. 10-2011-0132277 (published on Dec. 07, 2011)

An object of the present invention is to provide an electrode reduction device and an electric furnace capable of clamping an electrode rod without using hydraulic pressure.

An object of the present invention is to provide an electrode reduction apparatus and an electric furnace capable of minimizing welding and machining points.

An object of the present invention is to provide an electrode reduction apparatus and an electric furnace which are easy to maintain.

An object of the present invention is to provide an electrode reduction device and an electric furnace which can be easily transported and installed through modularization.

The problems to be solved by the present invention are not limited thereto, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a plasma processing apparatus comprising: a main frame surrounding an electrode; A lower clamping unit having at least two or more first clamping modules installed at equal intervals on the main frame and clamping and unclamping the electrode rod; An upper clamping unit having at least two second clamping modules spaced apart from the upper portion of the lower clamping unit and equidistantly installed, the upper clamping unit clamping and unclamping the electrode rod; And a lowering cylinder unit positioned between the lower clamping unit and the upper clamping unit to up-down the upper clamping unit.

In addition, the main frame has a regular polygonal shape, and the first clamping module may be installed on each side of the polygon.

The lower clamping unit may include a cylinder frame in which the first clamping module is installed; A first connecting plate connected to and supporting the lower ends of the neighboring cylinder frames and fixed to the main frame; And a second connecting plate for connecting and supporting an upper end of the adjacent cylinder frame.

Further, the upper clamping unit may include a cylinder frame in which the second clamping module is installed; A third connecting plate for supporting the lower ends of the neighboring cylinder frames and respectively supported by the lowering cylinder units; And a fourth connecting plate for connecting and supporting the upper end of the neighboring cylinder frame.

The electrode reduction device may further include: a cleaner installed at an upper end of the upper clamping unit to clean the surface of the electrode; And an encoder that contacts the surface of the electrode to measure a movement amount of the electrode when the electrode is pressed down, and detects an arbitrary movement of the electrode.

Each of the first clamping module and the second clamping module clamps the clamping pad by contacting the electrode with the electrode using the elastic force of the elastic member and contacts the clamping pad from the electrode using the hydraulic pressure of the cylinder, can do.

Each of the first clamping module and the second clamping module includes a pad member having a clamping pad positioned in front of the cylinder frame so as to face the electrode, and being movable in the longitudinal direction on the cylinder frame; A clamping elastic member provided on the cylinder frame and pressing the pad member in all directions so that the clamping pad clamps the electrode rod; And an unclamping cylinder installed in the cylinder frame, the clamping pad presses the pad member in a rearward direction to unclamp the electrode rod.

Each of the first clamping module and the second clamping module includes a fixing plate installed on the cylinder frame; An operating rod installed on the fixed plate so as to be movable back and forth; A clamping pad located in front of the cylinder frame facing the electrode rod and installed at the tip of the actuating rod; A moving plate fixedly installed at a rear end of the operating rod and spaced apart from the fixed plate; A support plate spaced apart from the moving plate and supported by the fixed plate by a plurality of support rods; A clamping resilient member positioned between the moving plate and the support plate and pressing the moving plate in all directions so that the clamping pad clamps the electrode rod; And an unclamping cylinder mounted on the fixed plate, the clamping pad pressing the movable plate in the backward direction to unclamp the electrode rod.

According to an aspect of the present invention, A cover which opens and closes the open top of the body and has through holes; An electrode rod inserted into the body through the through hole of the cover; An electrode elevating device for elevating the electrode rod; And an electrode reduction device installed in the electrode elevating device for pressing down the electrode, the electrode reduction device comprising: a main frame; At least two or more first clamping modules installed at regular intervals on the main frame clamp the electrode using the elastic force of the elastic member; At least two second clamping modules spaced apart from the upper portion of the lower clamping unit and installed at equal intervals clamp the electrode using the elastic force of the elastic member; And downward cylinder units positioned between the lower clamping unit and the upper clamping unit to up-down the upper clamping unit.

Each of the first clamping module and the second clamping module may include a clamping elastic member for clamping the clamping pad by contacting the electrode using the elastic force of the elastic member; And an unclamping cylinder for unclamping the clamping pad from the electrode using the hydraulic pressure of the cylinder.

According to the embodiment of the present invention, the electrode rod is clamped by using the elastic force, so that it has a remarkable effect of preventing the electrode slip or the deviation phenomenon due to the abnormality of the hydraulic line.

According to the embodiment of the present invention, it is possible to minimize the number of welding and machining points, and has a remarkable effect of easy maintenance.

According to the embodiment of the present invention, the transportation and installation through modularization can be facilitated.

The effects of the present invention are not limited to the above-mentioned effects, and the effects not mentioned can be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

1 is a view showing an electric furnace according to an embodiment of the present invention.
2 is an enlarged view of the electrode pressing apparatus shown in Fig.
3 is a perspective view of the electrode pressing apparatus.
4A and 4B are a plan view and a side view of the electrode reduction device shown in FIG.
5 and 6 are views showing the clamping state and the unclamping state of the first clamping module, respectively.
Figs. 7A to 7F are views showing steps of mounting the lower clamping unit. Fig.
8A to 8F are views showing a step of mounting the upper clamping unit.
9 is a view showing a procedure for maintenance of a clamping pad.
10 is a view showing a conventional electrode pressing apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout the specification and claims. The description will be omitted.

1 is a view showing an electric furnace according to an embodiment of the present invention

1, an electric furnace 1 for melting an iron-containing material such as an alloy iron includes a furnace shell 10, a cover 20, a three-phase alternating current electrode unit (100), and a power supply unit (90).

The main body 10 is provided with a cover 20 for covering the upper portion of the main body. A raw material inlet pipe 22 is provided at one edge of the cover 20 and a ventilation duct 24 for exhausting non-product and gas generated inside the main body 10 is provided at a position opposite to the raw material inlet pipe 22 Respectively. The inside of the main body 10 is forcedly exhausted through the ventilation duct, thereby generating negative pressure therein.

Three through holes 26 are provided in the vicinity of the center of the cover 20. In the through hole 26, the electrode rod 102 of the electrode unit 100 is disposed. In this embodiment, only two electrode units 100 and two through holes 26 are opened for the sake of simplicity.

The power supply unit 90 is for supplying power to the electrode rod 102 and the power supply unit 90 is connected to the electrode rod 102 through the path of the flexible cable 99, .

 The electrode units 100 all have the same configurations. Therefore, one electrode unit will be described in this embodiment.

Referring again to FIG. 1, the electrode unit 100 includes an electrode rod 102, a mantle 104, an electrode elevating device 110, and an electrode reduction device 200.

The electrode rod 102 can be inserted into the interior of the main body 10 through the through hole 26 of the cover 20. The lower end of the electrode rod 102 is positioned so as to be locked at a certain depth in the melt. When a large current is applied to the electrode rod 102 of the electrode unit 100, a high temperature arc heat and resistance heat are generated, and the raw material supplied into the main body 10 is melted.

The length of the electrode rod 102 is shortened due to high temperature and abrasion during working. Accordingly, when the length of the electrode rod 102 is shortened, the carbon case is further connected to the upper end of the electrode rod 102, and the carbon paste is supplied to the inside of the electrode case 102. During the process, the carbon paste is melted and cured, .

The mantle 104 is installed to surround the electrode rod 102. And has a gap between the mantle 104 and the electrode rod 102.

The electrode lifting device 110 is for adjusting the height of the electrode rod 102. The electrode elevating device 110 adjusts the height of the electrode rod 102 in accordance with the height of the melt in the main body 10 since the lower end of the electrode rod 102 must be locked to a certain depth in the melt. The electrode elevating apparatus 110 includes a cylinder unit 112 installed in a vertical direction on a fixed frame 2 in the field where the electric furnace 1 is installed and a cylinder unit 112 connected to an end of the rod 114 of the cylinder unit 112, And a lifting bracket (116) secured to the base (104).

Although not shown, a guide roller (not shown) for guiding the mantle 104 moved by the electrode elevating apparatus 110 is installed between the stationary frame 2 and the mantle 104 where the electrode elevating apparatus 110 is installed .

The lifting bracket 116 is provided with an electrode reduction device 200. The electrode reduction device 200 has a role of reducing the length of the electrode rod 102 by a length consumed during the steelmaking process and a holder for holding the electrode rod 102.

The upper end of the electrode rod 102 exposed toward the upper end of the mantle 104 is fixed by the electrode reduction device 200 and the lower end of the electrode rod 102 exposed below the mantle 104 is fixed to the lower end of the power feeding unit 90 The electrode rod 102 is fixed to the electrode holder 92 provided on the tapered ring and does not completely fix the lower end of the electrode rod 102 but holds the electrode rod 102 at a constant pressure. Can be reduced.

Fig. 2 is an enlarged view of a portion A shown in Fig. 1, Fig. 3 is a perspective view of the electrode reduction device, and Figs. 4a and 4b are a plan view and a side view of the electrode reduction device shown in Fig.

2 to 4B, the electrode reduction device 200 may include a main frame 210, a lower clamping unit 220b, an upper clamping unit 220a, and a push-down cylinder unit 300. [

The electrode reduction device 200 is located at the top of the electrode rod 102 exposed from the mantle 104. The upper clamping unit 220a performs an operation of clamping / unclamping the electrode rod 102 and a pushing operation of moving the electrode rod 102 downward by a predetermined distance in a clamped state.

The lower clamping unit 220b performs a clamping / unclamping operation. When the upper clamping unit 220a is in the clamping state and the lower clamping unit 220b is in the unclamping state, the upper clamping unit 220a The electrode rod 102 is pressed down. When the lowering of the electrode rod 102 is completed, the lower clamping unit 220b is returned to the clamping state, and the upper clamping unit 220a is returned to the original position by the lowering cylinder unit in the unclamping state of the upper clamping unit 220a.

The main frame 210 may be provided in a regular polygonal shape and the first clamping module of the lower clamping unit 220b may be installed on each side of the polygon. The main frame 210 may be fixed on the lifting bracket 116 of the electrode elevating apparatus 110.

Referring to FIG. 7A, the main frame 210 has four sides 212 corresponding to the sides of the main frame 210. The main frame 210 has corners 212 corresponding to the diagonal lines of the rectangles at adjacent positions, And may be formed to have an octagonal shape having sides 214. A mounting plate 216 is mounted on the corner 214 and the first connecting plate 222 may be mounted on the mounting plate 216 by a plurality of bolts. In this embodiment, a main frame having four sides and four corner sides is shown, but a hexagonal shape having three sides and three corner sides or a hexagonal shape having five sides and five corner sides Can be provided in various shapes.

The lower clamping unit 220b may include a cylinder frame 224, a first connecting plate 222, a second connecting plate 226 and a first clamping module 230.

The cylinder frames 224 are interconnected by a first connecting plate 222 and a second connecting plate 226. The first connecting plate 222 connects and supports the lower end of the adjacent cylinder frame 224 and the second connecting plate 226 connects and supports the upper end of the neighboring cylinder frame 224. The cylinder frames 224 and the first connecting plates 222 and the second connecting plates 226 are mutually fixed by bolting.

The first connecting plate 222 is bolted to the mounting plate 216 of the main frame 210. The first connecting plate 222 includes fastening holes 222a (shown in Fig. 7B) for connection with the cylinder frame 224 at both ends.

The second connection plate 226 is provided in substantially the same form as the first connection plate 222 and the second connection plate 226 is provided at both ends with fastening holes 226a for connection with the cylinder frame 224 As shown in FIG.

The first clamping module 230 is installed in the cylinder frame 224. The first clamping module 230 has the same configuration as the second clamping module 270 of the upper clamping unit 220a.

The first clamping module 230 clamps the clamping pad 242 by contacting the electrode rod 102 by using the elastic force of the elastic member and unclamps the clamping pad 242 from the electrode rod by using the hydraulic pressure of the cylinder .

5 and 6 are views showing the clamping state and the unclamping state of the first clamping module, respectively.

5 and 6, in an embodiment of the present invention, the first clamping module 230 may include a pad member 240, a clamping elastic member 250, and an unclamping cylinder 260.

The pad member 240 includes a clamping pad 242 positioned to face the electrode rod 102 in front of the cylinder frame 224, an operation rod 244 installed to be movable back and forth on the fixed plate 232, And a moving plate 246 fixedly installed at the rear end of the fixed plate 232 and spaced apart from the fixed plate 232. The fixing plate 232 is fixed to the cylinder frame 224.

The clamping resilient member 250 includes a support plate 254 and a spring 252. The support plate 254 is supported on the fixed plate 232 by a plurality of support rods 256. The support plate 254 is disposed at a predetermined distance from the moving plate 246, and a spring 252 is provided therebetween. The spring 252 resiliently urges the movable plate 246 in the direction of the left arrow while the movable plate 246 is supported by the support plate 254 and the movable plate 246 moves in the clamping direction Thereby clamping the electrode rod 102.

The unclamping cylinder 260 is installed on the fixed plate 232. The unclamping cylinder 260 presses the moving plate 246 backward so that the clamping pad 242 unclamps the electrode rod 102 (the direction of the arrow shown in Fig. 6). An opening 232a is formed at the center of the fixed plate 232 and the push rod 262 of the unclamping cylinder 260 is brought into contact with one surface of the moving plate 246 through the opening 232a.

The push-down cylinder unit 300 is provided between the lower clamping unit 220b and the upper clamping unit 220a to up-down the upper clamping unit 220a. The push-down cylinder unit 300 is installed in the second connecting plate 226. The push-down cylinder unit 300 can be located in the space between the cylinder frames 224 of the lower-end clamping unit 220b. The cylinder rod 310 of the push-down cylinder unit 300 protrudes from the upper portion of the second connecting plate 226 and the third connecting plate 227 is mounted at the end of the cylinder rod 310. That is, the push-down cylinder unit 300 is moved up and down by the third connecting plate 227 while being supported by the second connecting plate 226.

2 to 4B, the upper clamping unit 220a is provided in almost the same configuration as the lower clamping unit 220b.

The upper clamping unit 220a may include a cylinder frame 223, a third connecting plate 227, a fourth connecting plate 228, and a second clamping module 270. Here, the cylinder frame 223 is the same as the cylinder frame 224 of the lower clamping unit 220b, and the second clamping module 270 has the same configuration as that of the first clamping module 230, .

On the other hand, the third connecting plate 227 is supported by the cylinder rod 310 of the knock down cylinder unit 300 (see Fig. 8B), and both ends thereof are fixed to the cylinder frame 223. That is, the cylinder frame 223 is supported by the third connecting plates 227. The upper end of the cylinder frame 223 is connected and supported by the fourth connecting plates 228.

As described above, the lower clamping unit 220b and the upper clamping unit 220a can be easily transported and installed through modularization, thereby reducing the construction period and reducing the cost by minimizing welding and machining points . In particular, the lower clamping unit and the upper clamping unit are simple in structure and easy to maintain.

The fourth connection plate 228 is provided with a cleaner 290 for cleaning the surface of the electrode rod, an encoder 298 for contacting the surface of the electrode rod 102 to measure the amount of movement when the electrode rod is pressed down and sensing any movement of the electrode rod, And a phase voltage meter 299 for measuring the phase voltage of the phase current.

The cleaner 290 includes a half-shaped scraper 292 to contact the surface of the electrode when the electrode rod 9102 is lowered to remove foreign matter adhering to the surface of the electrode. The scraper 292 may be made of a rubber material to minimize electrode surface damage.

The encoder 298 measures the movement amount when the electrode rod is depressed and measures whether any movement occurs in the clamped state of the electrode rod.

FIGS. 7A to 7F are views showing the step of mounting the lower clamping unit in a stepwise manner, and FIGS. 8A to 8F are views showing a step of mounting the upper clamping unit.

Referring to FIGS. 7A to 7F, a first connection plate 222 is installed on the main frame 210. And the cylinder frame 224 is installed between the first connection plates 222. The first clamping module 230 is mounted on the cylinder frame 224. After the four first clamping modules 230 are all mounted, the upper ends of the cylinder frames 224 are connected to and supported by the second connecting plate 226, and the lower clamping unit 220b is mounted Is completed.

8A to 8F, the push-down cylinder unit 300 is installed on the second connecting plate 226 before the upper clamping unit 220a is installed. The cylinder rod 310 of the screw down cylinder unit 300 protrudes from the upper portion of the second connecting plate 226 and the third connecting plate 227 is installed at the end of the cylinder rod 310. The third connecting plates 227 are provided with the cylinder frame 223 and the cylinder frame 223 is provided with the second clamping module 270. When the mounting of the four cylinder frames 223 and the four second clamping modules 270 is completed, the upper ends of the cylinder frames 223 are interconnected and supported using the fourth connecting plate 228.

The cleaner 290, the encoder 298 and the phase voltage meter 299 are installed on the fourth connection plate 228 by covering the portion where the push-down cylinder unit 300 is installed by using the cover 390 The installation of the electrode pressing apparatus is completed.

9 is a view showing a procedure for maintenance of a clamping pad.

9, after the cleaner, the encoder, and the phase voltage meter provided in the fourth connection plate 228 are disassembled, a replacement support 90 and a round bar 92 are installed. A chain block 94 is provided on the round bar 92 and a chain block 94 is connected to the clamping pad 242. After the fixing bolts of the clamping pads 242 are disassembled, the maintenance and replacement work may be performed by lifting the clamping pads 242 upward by using the chain block 94.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Electrode unit 102: Electrode
110: Electrode lifting device 200: Electrode pressing device
210: main frame 220a: upper clamping unit
220b: lower clamping unit 300: push-down cylinder unit

Claims (10)

A main frame surrounding the electrode;
A lower clamping unit having at least two or more first clamping modules installed at equal intervals on the main frame and clamping and unclamping the electrode rod;
An upper clamping unit having at least two second clamping modules spaced apart from the upper portion of the lower clamping unit and equidistantly installed, the upper clamping unit clamping and unclamping the electrode rod; And
Down cylinder units positioned between the lower clamping unit and the upper clamping unit to up-down the upper clamping unit. The method according to claim 1,
The main frame
Wherein the first clamping module is installed on each side of the polygon. The method according to claim 1,
The lower clamping unit
A cylinder frame in which the first clamping module is installed;
A first connecting plate connected to and supporting the lower ends of the neighboring cylinder frames and fixed to the main frame; And
Further comprising a second connecting plate for connecting and supporting an upper end of the adjacent cylinder frame. The method of claim 3,
The upper clamping unit
A cylinder frame in which the second clamping module is installed;
A third connecting plate for supporting the lower ends of the neighboring cylinder frames and respectively supported by the lowering cylinder units; And
And a fourth connecting plate for connecting and supporting an upper end of the neighboring cylinder frame. 5. The method of claim 4,
The electrode reduction device
A cleaner provided at an upper end of the upper clamping unit to clean the surface of the electrode; And
Further comprising an encoder that contacts the surface of the electrode to measure a movement amount of the electrode when the electrode is pressed, and detects an arbitrary movement of the electrode. The method according to claim 1,
Each of the first clamping module and the second clamping module
Wherein the clamping pad is brought into contact with the electrode rod by using an elastic force of the elastic member to clamp the clamping pad, and the clamping pad is unclamped from the electrode rod by using the hydraulic pressure of the cylinder. 5. The method of claim 4,
Each of the first clamping module and the second clamping module
A pad member having a clamping pad positioned to face the electrode rod in front of the cylinder frame, the pad member being movable on the cylinder frame in a forward and backward direction;
A clamping elastic member provided on the cylinder frame and pressing the pad member in all directions so that the clamping pad clamps the electrode rod; And
And an unclamping cylinder installed in the cylinder frame for pressing the pad member in the rear direction so that the clamping pad unclamps the electrode rod. The method according to claim 1,
Each of the first clamping module and the second clamping module
A fixing plate installed on the cylinder frame;
An operating rod installed on the fixed plate so as to be movable back and forth;
A clamping pad located in front of the cylinder frame facing the electrode rod and installed at the tip of the actuating rod;
A moving plate fixedly installed at a rear end of the operating rod and spaced apart from the fixed plate;
A support plate spaced apart from the moving plate and supported by the fixed plate by a plurality of support rods;
A clamping resilient member positioned between the moving plate and the support plate and pressing the moving plate in all directions so that the clamping pad clamps the electrode rod; And
And an unclamping cylinder mounted on the stationary plate for pressing the movable plate in a rearward direction so that the clamping pad unclamps the electrode rod. In the electric furnace:
A main body having an opened upper surface;
A cover which opens and closes the open top of the body and has through holes;
An electrode rod inserted into the body through the through hole of the cover;
An electrode elevating device for elevating the electrode rod; And
And an electrode reduction device installed in the electrode elevating device for pressing down the electrode,
The electrode reduction device
Mainframe;
At least two or more first clamping modules installed at regular intervals on the main frame clamp the electrode using the elastic force of the elastic member;
At least two second clamping modules spaced apart from the upper portion of the lower clamping unit and installed at equal intervals clamp the electrode using the elastic force of the elastic member; And
And lowering cylinder units positioned between the lower clamping unit and the upper clamping unit to up-down the upper clamping unit. 10. The method of claim 9,
Each of the first clamping module and the second clamping module
A clamping elastic member for clamping the clamping pad by bringing the clamping pad into contact with the electrode using the elastic force of the elastic member; And
And an unclamping cylinder for unclamping the clamping pad from the electrode rod by using the hydraulic pressure of the cylinder.

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