JP2543642Y2 - Electrode support equipment for electric furnaces - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode supporting device for an electric furnace such as a three-phase arc furnace.

[0002]

2. Description of the Related Art In a three-phase arc furnace of this kind, a large current flows, so that it is necessary to suppress the power loss of electric equipment. For this reason, various devices have been devised for the electrode supporting device so as to reduce the bus for supplying electricity to the furnace electrode and the impedance of the furnace electrode.

[0003] As this prior art, For example, Japanese fairness 4-49
No. 760 is known. Before Kitoku fairness 4-49
No. 760 discloses an arrangement in which three electrode support arms are arranged in parallel, and a vertical portion having the same cross-sectional shape as the cross-sectional shape of the support arm is provided at the tip of the electrode support arm. The three electrode support arms are arranged as close as possible without the overhang portion, and the electrodes are held as close as possible to the lower end of the vertical portion, so that the electrodes are brought as close as possible.

[0004] Then, coated with good conductors an outer surface of the electrode support arms, while increasing the self geometrical mean distance as typical spite of busbars, arranged left and right of the electrode support arms at the same height, the central The electrode support arms are arranged in a higher order, that is, in a so-called triangular arrangement, the mutual geometric average distance is reduced, and the impedance is reduced.

[0005]

[Problem to be solved by the present invention ] Japanese Patent Publication No. 4-49760
According to the publication, three electrode support arms are arranged in a triangle.
The left and right electrode support arms move up and down
Facing the top of the mast, so that the top of the mast is
There is a problem that induction heating can be performed. Thus the central rise
The top of the descending mast is guided by the left and right electrode support arms.
When heated, the upper end of the central lifting mast is the electrode support arm
Is burned to the underside of the
There was a possibility that it would become impossible. Also, place the electrode support arm in the center
The mounting bolts for fixing to the lifting mast are
Damage and make it impossible to replace this bolt.
There was also a fear that.

Furthermore, those the conventional is Installing <br/> with portions of the electrodes are provided on the vertical portion, since the vertical portion is exposed to a high temperature be positioned above the furnace top The service life of the vertical portion is short, and frequent repair and replacement may be required. In addition, in this conventional device, since the electrodes must be mounted from the lower surface side of the vertical portion, the electrodes cannot be mounted and removed by hanging them with a crane or the like, and the electrode replacement work is difficult. There was.

Accordingly, an object of the present invention is to provide an electrode supporting device which solves the above-mentioned problems.

[0008]

In order to achieve the above object, the present invention takes the following measures. That is, the present invention
Of the lifting mast
Hold the electrodes at the tips of the three electrode support arms
An electrode holder is provided, and an outer peripheral surface of each of the electrode support arms is provided.
Are covered with good conductors and these
Of the pole support arms, the left and right electrode support arms are the same height
The center electrode support arm is located on the left and right electrode support arms.
To the electrode support device of the electric furnace located above the
In this case, the lower surface of the middle part of the electrode supporting arm is
Cool between the upper end surface of the central lifting mast that supports the arm.
It is characterized by the fact that a jacket is interposed
Item 1).

In this case, the center electrode supporting arm is raised to the center.
Bolts for fixing to the descending mast, cooling jacket
It is preferable to provide so as to penetrate (claim 2). Also, the central electrode support arm and a central support
As a specific connection structure with the descending mast, a base plate provided on the lower surface side of the electrode support arm is fixed with first bolts, and an insulator provided on the lower surface side of the base plate and a lower surface side of the insulator The cooling jacket fixed to the upper surface of the lifting mast and the cooling jacket may be fixed by a second bolt (claim 3) .

Furthermore, in the present invention, and the electrode support arm and the electrode holder, it is good to removably connected by male and female fitting portion (claim 4). Further, an electrode insertion hole penetrating vertically is formed in each of the electrode holders.
In addition, a clamp block for clamping an electrode inserted into the electrode insertion hole is provided so as to be movable in a radial direction of the electrode insertion hole, and each of the electrode support arms is configured to move the clamp block in the radial direction. embedded devices as a unit, is good to detachably couple the clamp block and the drive unit (claim 5).

[0011]

According to the present invention, placing the left and right of the electrode support arms at the same height, the central electrode support arm, by arranging the upper than the left and right of the electrode support arms, three of the electrode support arm Since the equiangular arrangement can be used as the triangular arrangement, three-phase equilibrium is improved.

[0012] Thus the electrode support arm triangle arrangement, but the top of the center of the lift mast is induction heated to face the left and right of the electrode support arm, in the present invention, the center electrode
The lower surface of the middle part of the support arm and the center lift supporting this arm
A cooling jacket is interposed between the top surface of the descending mast and
Therefore, this cooling jacket is
Prevent temperature rise of the part.

Also, the center electrode support arm is
Bolts for fixing to the strike
The cooling jacket surrounds the bolts.
The bolts are prevented from being damaged by the induction heating. Change
In addition, since the electrode holder is configured to be detachable from the electrode support arm by the male and female fitting portions , replacement of the electrode holder is facilitated.

Further, a driving device of the electrode clamping device is
Since it is provided on the electrode support arm side, the degree of receiving high heat from the furnace top is reduced, and its life is extended. And since the drive device is unitized, the adjustment can be performed before assembling, and the adjustment is easy.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, the electrode support device of the present invention has three electrode support arms 1 arranged in parallel with each other and horizontally. Each of the electrode support arms 1 is supported by an elevating mast 2 at an intermediate portion in the longitudinal direction.

An electrode holder 4 having an electrode insertion hole 3 penetrating in the vertical direction is provided at the tip of each electrode support arm 1. The electrode holder 4 of the central electrode support arm 1
Are arranged on an extension of the support arm 1, and the electrode holders 4 of the left and right electrode support arms 1 are arranged in a bent shape toward the center. This refraction angle is set to 30 ° with respect to the center line. Each of the electrode holders 4 is arranged such that the center of the electrode insertion hole 3 is located at the vertex of an equilateral triangle.

An electrode 5 is inserted and held in the electrode insertion hole 3 of each electrode holder 4. The lower end of each electrode 5
It is inserted from the furnace top of an electric furnace (not shown). A power supply cable 6 is connected to an end of each of the electrode support arms 1 opposite to the electrode holder. 3 to 6,
The details of the mounting structure between the electrode support arm 1 and the lifting mast 2 are shown. The electrode support arm 1 has a square pipe-shaped cross section, and its outer surface is formed of a good conductor 7 such as copper.
Coated with A water cooling space is formed between the good conductor 7 and the support arm 1. This good conductor 7
Transmits the current from the power supply cable 6 to the electrode holder.
4 is a conductor flowing through the electrode 6 held by the electrode 4. And, of the three electrode support arms 1, those on both the left and right
They are arranged at the same height, with the central one being located higher than its left and right ones.

The three electrode support arms 1 are arranged as close as possible to each other. In order to enable this arrangement as close as possible, the electrode support arm 1 at the center and the lifting mast 2 have a joint structure that does not have a flange that projects laterally. That is, the central electrode support arm
1 and the lifting mast 2 are connected to the electrode support arm 1
Are connected within the width direction dimension. Specifically, the following coupling structure is employed.

That is, a projection 9 protruding downward is provided on the lower surface of the electrode support arm 1 at the center, and a base plate 11 having a concave groove 10 fitted into the projection 9 is attached to the lower surface of the electrode support arm 1. Are fixed by first bolts 12. An insulator 13 is laid on the lower surface of the base plate 11, and the insulator 13
A water cooling jacket (cooling jacket) 14 is provided on the lower surface of 13, and the lifting mast 2 is fixed to the lower surface of the water cooling jacket 14.

The base plate 11 and the water-cooled jacket 14
The fixing between is fixed to the base plate 11, and
This is performed by screwing a nut 16 to an embedded bolt 15 which is a second bolt that penetrates the water cooling jacket 14 and protrudes downward. The buried bolt 15 and the water cooling jacket 14 are insulated by an insulating sleeve washer 17.

Thus, the middle of the central electrode support arm 1
On the central lifting mast 2 in supporting the arm 1 and the lower surface
A water-cooled jacket 14 is interposed between the end face and
Also, fix the center electrode support arm 1 to the center lifting mast 2
Embedded bolts 15
It is provided so as to penetrate. The base plate 11
And the width of the water-cooled jacket 14
Is smaller than or equal to the width dimension of

The water cooling jacket 14 faces the electrode support arms 1 arranged on both left and right sides. That is,
The water cooling jacket 14 is for preventing the lifting mast 2 from being heated by dielectric heating due to a large current flowing through the good conductor 7 on the outer surface of the electrode support arm 1 on the left and right sides thereof. An outwardly protruding bracket 18 is fixed to the outer side surfaces of the left and right electrode support arms 1, and the lower surface of the bracket 18 and the lifting mast 2 are connected by the same configuration as that of the central portion. However, water cooling jackets may be omitted on both the left and right sides.

FIG. 7 shows a detailed structure of the electrode holder 4. The center electrode holder 4 is provided at a position one step lower than the center electrode support arm 1, and the left and right electrode holders 4 are provided at the same height as the left and right electrode support arms 1. The two electrode holders 4 are arranged at the same height. As shown in FIG. 7, the central electrode holder 4 is detachably fixed to a front surface of a hanging portion 19 provided to protrude downward from the tip of the electrode support arm 1 by a bolt 20. In this case, the bolt 20 is arranged within the width dimension of the electrode support arm 1. That is, since there is no connection flange projecting to the left and right sides of the electrode support arm 1, the approach arrangement of the three electrode support arms 1 is not hindered.

A clamp block 21 is provided on the electrode holder 4.
Are provided slidably in the radial direction of the electrode insertion hole 3. The inner peripheral surface of the clamp block 21 comes into contact with the outer peripheral surface of the electrode 6 so as to be able to freely contact and separate, and the electrode 6 is inserted into the electrode insertion hole 3.
The electrode 6 is pressed against the inner peripheral surface to fix the electrode 6 to the electrode holder 4. A drive device 22 for moving the clamp block 21 is detachably provided on the hanging portion 19 of the electrode support arm 1.

The driving device 22 includes a cylinder 24 fixed to a gantry 23, a connecting rod 27 connected to a piston rod 25 of the cylinder 24 via a coupling 26, and an externally connecting the connecting rod 27. The biasing elastic member 28 is assembled as a unit. And the base of this unit
23 is detachably attached to the rear surface of the hanging part 19 via a bolt 30. The connecting rod 27 and the clamp block 21 are removably connected by connecting pins 31.

Thus, the clamp block 21 is urged by the elastic member 28 toward the center of the electrode insertion hole 3 to clamp the electrode 6. The release of the electrode clamp is performed by moving the piston rod 25 against the elastic member 28. The left and right electrode holders 4
The electrode support arm 1 is detachably fixed to the front surface of a bending portion 32 provided in a bending shape on the outer side of the distal end of the electrode supporting arm 1 by bolts in the same manner as the center one. The electrode holder 1 is also provided with a clamp block 21, the structure of which is the same as that of the central one. A driving device 22 is provided on the bending portion 32, and the driving device 22 is the same as the central device.

FIG. 8 shows a structure in which the electrode holder 4 and the electrode support arm 1 are connected by one-touch connection without using bolts. That is, the electrode support arm 1 and the electrode holder 4 are detachably connected by the male and female fitting portions 33, 34, and the electrode support arm 1 and the electrode holder 4 are detached from the male and female fitting portions 33, 34. A cotter 35 for preventing the occurrence of stagnation is provided detachably.

The male and female fitting portions 33 and 34 are provided with electrode supporting arms.
1 and a male fitting portion 33 formed at the rear end of the electrode holder 1 so as to engage with the female fitting portion 34 from above. It is composed of The female fitting portion 34 has a dovetail shape with a narrow tip and a large depth. The male fitting portion 33 is substantially T-shaped. When the male fitting portion 33 is fitted into the female fitting portion 34 from above, a gap is formed between the narrow portion of the female fitting portion 34 and the T-shaped projection of the male fitting portion 33. You. The pair of left and right cotters 35 are press-fitted into the gap from above, thereby forming the electrode holder 4.
Is fixed to the electrode support arm 1.

According to the embodiment of the above configuration, three electrodes 6
Can be placed as close as possible to the electrode 6
Can be reduced. In addition, since the outer surface of the electrode support arm 1 is made of the good conductor 7 so that the electrode current flows, the self-geometric average distance can be increased. In addition, since the three electrode support arms 1 are arranged in parallel and substantially equidistantly, the mutual geometric average distance can be equalized and minimized in all three phases, and the impedance of the power supply path can be reduced. .

Further, since the central electrode support arm 1 does not have a flange or the like that protrudes to the left and right sides, the three electrode support arms 1 can be arranged close to each other. I have. Since the water-cooling jacket 14 is provided on the upper part of the elevating mast 2 at the center, dielectric heating can be prevented.

If the electrode holder 4 has a structure that does not use bolts, the attachment and detachment operation becomes easy. Clamp block 21
Since the drive device 22 is unitized, its assembly and adjustment are facilitated. The present invention is not limited to the above embodiment. For example, the male and female fitting structures of the electrode holder and the electrode support arm may be reversed.

[0032]

[Effect of the invention] According to the invention, the cooling jacket is guided.
Since to prevent a Atsushi Nobori of the mast top with the heating, the lift trout
The upper end of the electrode sticks to the lower surface of the electrode support arm and
It is possible to prevent the exchange of the
1). The cooling jacket also fixes the electrode support arm.
Around the bolts for induction
To prevent damage, the bolts may be
It is impossible to replace bolts due to
Naturally, it can be avoided (claims 2 and 3).

Further, the electrode holder is connected to the male and female fitting portions by the electrode.
Since it is detachable from the support arm, the electrode holder can be replaced.
This can be performed more easily than before (claim 4). Also, in the vertical direction
Clamp block that moves in the radial direction of the electrode insertion hole
The electrode is held by the
Is very easy and the block
Since the drive unit is located on the electrode support arm side, the furnace
Less heat received from the top and longer life
(Claim 5).

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view of the same.

FIG. 4 is a front view showing a coupling structure between an electrode support arm and a lifting mast.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a sectional view taken along line BB of FIG. 4;

FIG. 7 is a cross-sectional view showing details of a coupling structure between an electrode holder and an electrode support arm.

FIG. 8 is a sectional view showing another embodiment of the coupling structure of the electrode holder and the electrode support arm.

[Description of Signs] 1 Electrode support arm 3 Electrode insertion hole 4 Electrode holder 14 Cooling jacket (water cooling jacket) 21 Clamp block 22 Drive unit 33 Male fitting part 34 Female fitting part 35 Cotta

Claims (5)

(57) [Scope of request for utility model registration] 1. An upper end of each of three lifting masts (2)
Three parallel electrode support arms connected to each other (1)
The electrode holder (4) that holds the electrode (5) is provided at the tip of
Is the the outer circumferential surface good conductors of each electrode support arm (1) (7)
These electrode support arms
Of (1), the left and right electrode support arms (1) are arranged at the same height.
And the central electrode support arm (1) is
Electrode support for the electric furnace located above
The lower surface of the middle electrode support arm (1)
Between the upper end surface of the central lifting mast (2) that supports the
An electrode supporting device for an electric furnace , further comprising a cooling jacket (14) interposed therebetween. 2. An electrode supporting apparatus for an electric furnace according to claim 1, wherein a central electrode supporting arm (1) is fixed to a central lifting mast (2).
Bolt (15) passes through the cooling jacket (14)
An electrode supporting device for an electric furnace, wherein the electrode supporting device is provided as follows . 3. A electrode supporting device of an electric furnace according to claim 2, the coupling structure of the central lifting mast (2) for supporting the the electrode support arm Chuo (1), the electrode support arm (1) of the base plate (11) provided on the lower surface side is fixed by the first bolt (12), an insulator provided on the lower surface side of the base plate (11) and (13), the lower surface side of the insulating material (13) And the lifting mast (2)
The cooling jacket (14) fixed to the upper surface of the
An electrode supporting device for an electric furnace, which is fixed in (15) . 4. The electrode support device for an electric furnace according to claim 1, wherein said electrode support arm (1) and said electrode holder (4) are detachable by male and female fitting portions (33) (34). An electrode support device for an electric furnace, wherein the electrode support device is coupled to the electrode furnace. 5. The electrode support device of an electric furnace of claim 1, wherein in each electrode holder (4), the electrode inserted penetrating vertically
A through hole (3) is formed and this electrode insertion hole
(3) inserted through the electrode (5) clamping block (21) for clamping the is provided movably in the radial direction of the electrode insertion hole (3), wherein each electrode support arm (1), The clamp block
A drive device (22) for moving the (21) in the radial direction is detachably incorporated as a unit, and the drive device (22) and the clamp block (21) are detachably connected. Electrode support device for electric furnace.