JPH0442045Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a tundish heater for continuous casting in which the structure of the heat generating chamber communicating with the molten metal holding chamber of the tundish is improved.

(Prior art) Generally, when continuously casting billets, the molten metal melted in a melting furnace is first received in a tundish, and from there it is simultaneously poured into multiple ring-shaped water-cooled molds to continuously cast long billets. It is being done.

However, in recent years, as continuous casting lines have become larger, if a large amount of molten metal is stored in the tundish, the temperature of the molten metal will drop and the appropriate casting temperature cannot be maintained. The temperature of molten metal is raised by attaching it to the metal.

The structure of a conventional continuous casting tundish equipped with such a tundish heater is as shown in FIG. 4, for example.

The tundish 1 has a crucible-shaped molten metal holding chamber 3 formed inside thereof with a refractory material 2, and an opening 4 on the side thereof. A tap nozzle is formed at the bottom or lower side of the molten metal holding chamber 3.

6 is a tundish heater, heating coil 7
A horizontal crucible-shaped heating chamber 8 is formed inside of the refractory material 2, and an opening 9 of this heating chamber 8 communicates with the opening 4 of the molten metal holding chamber 3.

Tundish canteen 1 and Tundish canister heater 6
, the flanges 11a, 11b at the joint 10
are integrally joined by.

The molten metal 12 stored in the molten metal holding chamber 3 is inductively heated by a heating coil 7 in a heat generating chamber 8, and stirred and convected to heat and raise the temperature of the entire molten metal.

When the tundish heater 6 is operated for a long period of time in this manner, the refractory material 2 forming the heat generating chamber 8 gradually wears out due to stirring of the molten metal 12. If the refractory material 2 becomes thin, there is a risk of water leakage, so the condition of the refractory material 2 should be inspected and repaired periodically to prevent accidents and extend the service life of the refractory material 2. is being extended.

When carrying out this periodic inspection or repair, first, the entire amount of molten metal 12 in the molten metal holding chamber 3 and heating chamber 8 is tapped out,
After it has cooled, remove the bolts on the flanges 11a and 11b, peel off the joint 10 with jack bolts, and
After that, the tundish heater 6 had to be moved to the rear and lifted up by a crane, which made the separation work time-consuming.

In addition, when pouring out the entire amount of molten metal 12, the heating chamber 8
The bottom of the molten metal 12 is almost horizontal due to the slope of the cutting die during furnace construction, and since the molten metal 12 whose temperature has decreased has increased viscosity, it is not completely discharged from the heat generating chamber 8, causing heat generation as shown in Figure 4. The residual metal 12a remains from the bottom of the chamber 8 to the bottom of the molten metal holding chamber 3.

As a result, the remaining metal 12a solidifies and the metal solidified layer 1
Since the tundish heater 6 was stuck to the upper part of the joint 10, it was extremely troublesome to separate the tundish heater 6 from the tundish 1 by peeling off the joint 10.

If you try to forcefully separate this, as shown in FIG.
2b, and the repair area expanded to include the tundish 1 side, and in some cases, the furnace had to be rebuilt.

(Problems to be Solved by the Invention) The present invention eliminates the above drawbacks and provides a tundish heater for continuous casting that allows inspection and repair of the inside of the heating chamber to be easily carried out without removing the entire tundish heater. The purpose is to

[Structure of the idea]

(Means for Solving the Problems) The present invention involves winding a heating coil around the outer periphery of a heat-generating chamber made of refractory material, which is formed into a cylindrical shape with openings at both ends along the lateral direction, and opening one end of the heat-generating chamber. In a continuous casting tundish heater, which is formed into a horizontal crucible shape by communicating with an opening provided in a side wall of a molten metal holding chamber and closing an opening at the other end of the heating chamber with a closing part,
The heat generating chamber is characterized in that the space between the opening and the closing part at the other end of the heat generating chamber is vertically divided and removably joined.

(Function) To explain the function of the tundish heater for continuous casting of the present invention, the closed part side of the heat generating chamber of the tundish heater has a split structure, so when inspecting and repairing the inside of the heat generating chamber, the heater body By separating and removing the closed side while the side is connected to the tundish, the heating chamber can be opened from the opposite side, and the refractory material can be inspected and repaired from there.

(Example) Hereinafter, the present invention will be described in detail with reference to an example shown in the drawings.

FIG. 1 shows an embodiment of the present invention, in which a tundish 1 has a crucible-shaped molten metal holding chamber 3 formed with a refractory material 2 inside, an opening 4 on the side surface, and a bottom or lower side surface. There is a hot water nozzle 5
is formed.

A tundish heater 6 is integrally joined to the side of the tundish 1. This tundish heater 6 has a heating coil 7 wound around the outer periphery of a refractory material 2 formed into a cylinder with both ends opened in the lateral direction to form a heat generating chamber 8, and one end of the heat generating chamber 8. The opening 9 communicates with the opening 4 provided in the side wall of the molten metal holding chamber 3, and the opening at the other end of the heating chamber 9 is closed with a closing portion 13 to form a horizontal crucible shape.

Moreover, the tundish heater 6 is removably joined to the space between the opening at the other end of the heat generating chamber 8 and the closing part 13 by dividing the space into two parts in the vertical direction.

The closing member 6B constituting the closing portion 13 of the heat generating chamber 8 and the heater main body 6A are integrally joined by flanges 16a and 16b with a sealing material 15 interposed on the dividing surface 14.

The tundish 1 and tundish heater 6 also have flanges 11a, 1 at the joint 10.
1b.

In the tundish heater for continuous casting having the above structure, when the operation is stopped and the entire amount of molten metal 12 is discharged, the remaining metal 12a whose temperature has decreased and the viscosity has increased is transferred from the bottom of the heat generating chamber 8 to the molten metal holding chamber. 3 remains at the bottom of the opening 4.

At this time, the remaining hot water 12a at the bottom of the heat generating chamber 8 on the closed part 13 side (near the dividing surface 14) is removed from the opening 9.
I won't stay here because I'm being pulled to the side. When the temperature of the remaining hot metal 12a decreases and solidifies, the metal solidified layer 12b is stuck to cover the joint portion 10.

During periodic inspection or repair, the flanges 11a and 11b of the joint portion 10 are left joined as they are, and the flanges 16a and 16b of the dividing surface 14 are first removed to separate the closing member 6B from the heater main body 6A. As a result, the closed portion 13 of the heat generating chamber 8 on the opposite side to the opening portion 4 is also opened, and the inside of the heat generating chamber 8 is inspected and repaired from there. Note that in this state, the metal coagulation layer 12b remaining at the bottom of the heat generating chamber 8 can be easily peeled off from the inside.

FIG. 2 shows another embodiment of the present invention, in which a temperature sensor 17 is inserted into the heat generating chamber 8 from the closing part 13 by horizontally penetrating the center of the closing member 6B.

In the above structure, since the temperature sensor 17 is provided in the heat generating chamber 8, the temperature of the molten metal can be managed and controlled. Furthermore, since the temperature sensor 17 has a relatively short lifespan, it needs to be replaced, but since the closing member 6B has a divided structure, it can be easily replaced.

FIG. 3 shows another embodiment of the present invention, in which support arms (retainers) 18,
18 is horizontally protruded, and a guide rail 19 is attached to the upper part of this.

Further, on the side of the tundish heater 6, brackets 20 are provided protruding from both the left and right sides of the heater main body 6A and the closing member 6B, and rollers 21 are provided at the bottom of the brackets 20, respectively.
... are attached, and these rollers 21 ... run on the guide rails 19.

With this structure, during periodic inspection or repair of the heat generating chamber 8, the flanges 16a and 16b of the dividing surface 14 are removed and the closing member 6B is moved backward along the guide rail 19, thereby easily separating it from the heater main body 6A. It is also easy to align when joining.

Note that when the entire tundish heater 6 is separated from the tundish 1 at the joint 10, it can be moved along the guide rail 19 in the same manner.

The present invention can be applied not only to tundish heaters but also to the heat generating chamber structure of a pot (channel) type holding furnace which is provided with a molten metal holding chamber and a heat generating chamber.

[Effect of idea]

As explained above, according to the present invention, since the closed part side of the heat generating chamber of the tundish heater has a divided structure, when inspecting and repairing the inside of the heat generating chamber,
By separating and removing the closed part side while the heater main body side is connected to the tundish, the heating chamber can be opened from the opposite side, and inspection and repair can be easily carried out from there.

Therefore, even if the solidified metal layer is stuck continuously from the bottom of the heating chamber to the top of the joint, there is no need to separate the joint between the tundish dish and the tundish heater, and the blockage can be avoided. Since only the sides need to be separated, it is possible to obtain a tundish heater for continuous casting that has excellent workability and can prevent damage to the refractory material.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing a tundish heater for continuous casting according to one embodiment of the present invention, FIG. 2 is a longitudinal sectional front view showing a tundish heater for continuous casting according to another embodiment of the present invention, and FIG. FIG. 4 is a front view showing a tundish heater for continuous casting according to another different embodiment; FIG. 4 is a longitudinal sectional front view showing a conventional tundish heater for continuous casting; FIG. be. 1... Tanditetsu, 2... Fireproof material, 3...
Molten metal holding chamber, 4, 9...Opening, 6...Tundish heater, 6A...Heater body, 6B...
...Closing member, 7...Heating coil, 8...Heating chamber,
10... Joint part, 12... Molten metal, 12a...
Remaining hot water, 12b... Metal solidified layer, 13... Blocked part,
14... Divided surface, 17... Temperature sensor, 19...
...Guide rail.

Claims (1)

[Scope of utility model registration request] A heating coil is wound around the outer circumference of a heat generating chamber made of refractory material, which is formed into a cylindrical shape with both horizontal ends open.
A tundish for continuous casting in which an opening at one end of a heat generating chamber is communicated with an opening provided in a side wall of a molten metal holding chamber, and an opening at the other end of the heat generating chamber is closed with a closing part to form a horizontal crucible shape. A tundish heater for continuous casting, characterized in that the space between the opening and the closing part at the other end of the heat generating chamber is vertically divided and removably joined.