JP2642838B2 - Hearth structure of vertical induction heating furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical induction heating furnace of a lower charging type in which a slab is charged from below into a furnace and is heated at a high temperature and uniformly by induction heating. The present invention relates to a hearth structure of a vertical induction heating furnace in which a lower hearth metal member for fixing a possible hearth metal member is independently supported for each column.

[0002]

2. Description of the Related Art A vertical induction heating furnace is used to heat a slab, which has been heated to a predetermined temperature in advance by a continuous heating furnace or the like, at a higher temperature and more uniformly. 62-224630 and JP-A-3-4.
One described in Japanese Patent No. 5885 and the like is known.

[0003] In these devices, an induction heating coil is disposed on the outer periphery of a furnace body made of a box-shaped refractory heat insulating material having a slab loading port at a lower portion. And, on the hearth metal arranged below the inlet of the furnace body, a slab with a width direction up and down is mounted and supported, and the slab is loaded into the furnace body by raising the hearth, The slab is to be induction heated by an induction heating coil. After the heating, the hearth descends and the slab is carried out of the furnace.

[0004] The structure of the hearth is, for example, as shown in FIG. 4, a plurality of water cooling tubes 4 are arranged above a column group in which a plurality of water cooling tubes 4 are arranged in parallel at predetermined intervals in the furnace length direction. Each lower metal part 5 of the hearth is independently supported, and a lower part of the hearth extending in the furnace length direction is formed. Brick-shaped hearth metal members 6 are independently fixed on the upper parts of the respective hearth lower metal members 5. The plurality of hearth hardware 6
Are arranged side by side at predetermined intervals in the furnace length direction, and the slab 7 can be mounted and supported on the upper surface thereof.

[0005] The plurality of water cooling tubes 4 can be moved up and down synchronously by an elevating device (not shown). Note that, as described in Japanese Patent Laid-Open No. 4-36587, each of the above-mentioned hearth metal fittings has conventionally been integrally formed into a single brick shape. In order to improve the resistance of the
It has also been proposed to form each hearth metal 6 by a plurality of blocks 6a and 6b which can be divided as shown in FIG.

[0006]

The hearth is one in the furnace length direction.
Since it is designed so as to be longer than 0 m, it is divided into a plurality of pieces along the furnace length direction as described above, and each furnace length lower metal part 5 is independently supported by the water cooling pipe 4. In the conventional hearth structure, since the water cooling tubes 4 are not connected to each other, the hardware 5, 6 supported on the upper part of the water cooling tubes 4 are individually shaken and placed on the hearth hardware 6. It is necessary to set the rigidity of each water-cooled tube 4 to a predetermined value or more so that the slab 7 does not become unstable.

[0007] In particular, when the slab is charged into the furnace and heated, the temperature of the hearth metal on which the slab is placed also rises and thermally expands. When it is taken out of the furnace, a predetermined thermal expansion and contraction occurs in the hearth metal due to the temperature change so that it is allowed to cool down and is rapidly cooled and contracted.In recent years, directional silicon steel and the like have been manufactured. It is necessary to heat the slab to a high temperature of 1400 ° C. or more, and the higher the temperature at which the slab is heated, the greater the amount of thermal expansion and contraction generated in the hearth metal for mounting and supporting the slab. The slab placed on top tends to become unstable, and it is desired that the hearth support by the water-cooled tube be further strengthened.

The present invention has been made in view of the above problems, and has as its object to improve the stability of a slab placed on a hearth by firmly connecting water cooling tubes. I have.

[0009]

Means for Solving the Problems To achieve the above objects, a hearth structure of a vertical induction heating furnace according to the present invention comprises: a furnace body having a lower opening provided with a slab charging opening; A plurality of columns, which are arranged in parallel in the furnace length direction at predetermined intervals below the inlet of the furnace main body and can be raised and lowered in synchronization with each other, and a plurality of furnace floors individually fixed on the upper portions of the respective columns. In a vertical induction heating furnace comprising a metal part and a plurality of metal hearths fixed on the metal hearth lower part of the hearth and arranged in parallel at predetermined intervals in the furnace length direction, each of the metal hearths is The metal parts are placed so as to straddle between adjacent metal parts of the lower hearth, and are fixed to both metal parts of the lower hearth.

[0010]

Since each hearth metal is fixed so as to straddle between adjacent hearth metal, the lower metal hearths are firmly connected to each other by the hearth metal. The pillars supporting the lower metal part of the hearth are firmly connected to each other via the metal part of the hearth. As a result, the deflection of each of the columns and the hearth supported by the columns is restrained by the other columns, and the stability of the slab placed on the hearth supported by the group of columns is improved. .

[0011]

An embodiment of the present invention will be described with reference to the drawings.
First, the configuration will be described. As shown in FIG. 3, an induction heating coil 2 which is divided into upper and lower parts is horizontally wound around the outer periphery of a box-shaped furnace main body 1 having a slab charging inlet 1a formed below. . The induction heating coil 2 is connected to an induction power supply 3 so that induction heating can be performed by electric power supplied from the induction power supply 3.

A furnace floor structure as shown in FIGS. 1 and 2 is provided below the furnace body 1. That is,
A plurality of support pipes 4 whose axes are turned up and down are arranged along the furnace length direction, and at the top of each support pipe 4,
Since the lower metal hearths 5 are individually fixed, the plurality of lower metal hearths 5 are arranged so as to be arranged side by side in the furnace length direction to form a lower part of the hearth. A plurality of metal hearths 6 are fixed on the metal hearth lower part 5.

Each of the support pipes 4 has a double water-cooled pipe structure and is lined with a refractory and heat-insulating material. It can be moved up and down. Further, on the upper surface of each lower metal part 5 of the hearth, a convex part 5a extending in the furnace length direction at the center part in the furnace width direction is formed.

Each of the hearth metal fittings 6 is disposed on the lower block 6a fixed to the lower metal hearth metal fitting 5 and the lower block 6a in order to improve the resistance. It is constituted by a plurality of blocks including one or two upper blocks 6b on which the slab 7 can be directly mounted, and each is formed in a brick shape. The lower block 6a has, on its lower surface, a recess 6c that can be fitted to the projection 5a of the lower hearth metal fitting 5 along the furnace length direction. The biconvex part 5 of the hardware 5
a and are fixed to the protrusions 5a of the two lower metal hearths 5 by two pins 8 penetrating in the furnace width direction.

On the upper surface of the lower block 6a, one or two protrusions 6d extending in the furnace width direction are formed.
An engagement groove 6e and an engagement notch 6f are formed on both left and right sides of each protrusion 6d. In addition, each upper block 6b
A groove 6g extending in the furnace width direction is provided at the center of the furnace in the furnace length direction.
Are formed, and the left and right feet 6h of the groove 6g are relatively engaged with the locking groove 6e and the locking notch 6 of the lower block 6a.
and a pin that allows the foot h to engage with the locking groove 6e and the locking notch 6f of the lower block 6a, respectively, and penetrates the foot 6h in the furnace width direction. 9, the upper block 6b is fixed on the lower block 6a.

A slab 7 having a width in the vertical direction is mounted and supported on a hearth metal member 6 having a hearth structure configured as described above, and is operated via a support pipe 4 by the operation of a lifting device (not shown). The hearth and the slab 7 are raised, and the slab 7 is charged into the furnace body 1 and heated. When the heating of the slab 7 is completed, the hearth and the slab 7 are lowered and taken out of the furnace.

At this time, the plurality of lower metal hearths 5 independently fixed to the support pipes 4 are integrally connected by firmly connecting the lower metal hearths 5 adjacent to each other with the metal hearths 6. Therefore, even if the individual hearth metal pieces 6 and the lower hearth metal piece 5 attempt to oscillate independently, the other hearth metal pieces 6 and the lower hearth metal piece 5 restrain them and reduce the deflection. Therefore, even if the support pipe 4 having the same toughness and rigidity as the conventional one is used, the stability of the slab 7 mounted and supported on the hearth is improved by being firmly connected to each other via the hearth metal fitting 6. I do.

[0018]

As described above, the hearth structure of the vertical induction heating furnace according to the present invention has a simple connection structure.
The hardware that constitutes the hearth and the columns that support it are firmly connected to each other, so that the stability of the slab mounted and supported on the hearth is improved.

[Brief description of the drawings]

FIG. 1 is a side view showing a hearth structure of a vertical induction heating furnace according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a schematic configuration diagram showing a vertical induction heating apparatus according to an embodiment of the present invention.

FIG. 4 is a side view showing a hearth structure in a conventional vertical induction heating furnace.

FIG. 5 is a side view showing a second hearth structure in a conventional vertical induction heating furnace.

[Explanation of symbols]

 4 Support pipe (post) 5 Hearth lower hardware 6 Hearth metal 7 Slab

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-45885 (JP, A) JP-A-53-162110 (JP, U) JP-A-55-22348 (JP, U)

Claims (1)

(57) [Claims] 1. A furnace main body having a slab charging opening formed at a lower portion thereof, and a furnace main body below the charging opening of the furnace main body being arranged in parallel at a predetermined interval in a furnace length direction and synchronized. A plurality of columns that can be moved up and down, a plurality of lower metal parts of the hearth that are individually fixed to the upper parts of the respective columns, and are fixed on the lower metal parts of the hearth, and are arranged in parallel at predetermined intervals in the furnace length direction. In the vertical induction heating furnace provided with a plurality of hearth metal fittings, each of the above hearth metal fittings was placed so as to straddle between adjacent hearth lower metal fittings, and was fixed to both hearth lower metal fittings. A hearth structure for a vertical induction heating furnace, characterized in that: