JP3105166B2 - Skid button device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of supporting a material to be heated such as a slab or a billet in a walking beam type heating furnace or a heat treatment furnace and supporting the material to be heated from below in a furnace. The present invention relates to a skid button device for moving a material to be heated.

[0002]

2. Description of the Related Art A conventional skid button device 30 is shown in FIG.
As shown in the figure, a ceramic 32 is filled in a heat-resistant metal tubular case 31 whose upper surface is closed,
It is known that the lower end of a heat-resistant metal cylindrical case 31 is welded to the upper surface of a heat-resistant metal pedestal 20 which is welded to the upper surface of a horizontal metal skid pipe 10 covered with a cover (for example, Shokai 61). -82950).

More specifically, the inside of the skid pipe 10 is usually made of mild steel and is cooled by cooling water flowing inside. The reason that it is covered with fireproof insulation C is
The water-cooled, low-temperature skid pipe 10 removes heat (heat removal) from the slab, billet, or the like, which is a material to be heated supported by the skid button device 30, and generates a so-called skid mark in which the temperature is locally lowered. Is to prevent

[0004] The heat-resistant metal tubular case 31 constituting the skid button device 30 is made of heat-resistant, for example, heat-resistant cobalt-nickel-chrome cast steel, and is usually a cylindrical cast product. A molten metal of heat-resistant cast steel is poured, cooled, and then removed from the mold to be manufactured one by one. The ceramic 32 filled in the heat-resistant metal tubular case 31 also has heat resistance, for example, alumina, silica, zircon, titanium oxide, silicon carbide, titanium carbide, tungsten carbide, other simple substance or compound,
Consists of a mixture.

[0005]

According to the skid button device 30 described above, the metallic cylindrical case 31 is attached to the ceramic 3
2 is filled, the strength is high, the insulation is high,
Although it is presumed that the heat removal preventing effect is high, since the metal cylindrical case 31 is a cast product with low productivity, the production of the mold is costly and may have a defect peculiar to the cast product.
Furthermore, since it is directly welded to the pedestal 20, when replacing it with a new one at the time of burnout, breakage, or wear, removal of the refractory heat insulating material C, fusing of the base with the pedestal 20, re-welding to the new pedestal 20, etc. Is required, and the replacement operation is complicated.

Accordingly, an object of the present invention is to provide a heat insulating material which is excellent in heat removal from a material to be heated, does not need to be cast one by one, is inexpensive, and has a base for fusing at the base and mounting a new product. An object of the present invention is to provide a skid button device that does not require complicated operations such as welding and is easy to replace.

[0007]

In order to achieve the above object, a flat skid pipe covered with a refractory is welded to the upper surface and formed by welding four pieces of ordinary steel square bars.
A round piece of stainless steel (2
b) a skid body welded with its lower end inscribed
The skid button device (3) of the present invention, which is attached to the tongue holder (2), supports the material to be heated (90) such as a slab billet from below, and moves the material to be heated (90) by swinging. , liked head buttons fitted on the upper portion of the round bar piece (2b) of the holder (2), the lower end surface is held by the upper surface of the square frame (2a), formed by cleavage of centrifugal casting made of heat-resistant cast steel pipe Short tube (3a) and short tube (3
A horizontal hole is punched in the refractory castable (3b) filled in the short pipe (3a) while leaving a gap (S) at the upper end of the round pipe piece (2b) and the short pipe (3a). A pin (4) that is inserted into the pin hole (2c, 3c) so that the short pipe (3a) can be detachably attached to the round bar piece (2b) (claim 1).

Further, another skid button device (5) of the present invention is configured such that the short pipe (3a) having the structure of the first aspect of the present invention is filled with a refractory castable (3b) and is left hollow. (Claim 2).

The symbols in parentheses described in the means for solving the above-mentioned problems correspond to the symbols described in the drawings and the embodiments of the invention described later.

According to the first aspect of the present invention, the short pipe is filled with a highly heat-resistant refractory castable, and furthermore, the gap formed at the upper portion insulates the air, so that the area in contact with the material to be heated is small. The heat removal is smaller than in the conventional example in which the upper surface is covered with a metal surface. In addition, when replacing the skid button device, the short pipe can be easily removed from the round bar piece simply by pulling out the pin, and a new skid button device can be mounted on the short tube round bar piece. It can be implemented by extremely simple work such as external fitting of a pin and insertion of a pin.

According to the second aspect of the present invention, in addition to the operation and effect of the first aspect of the present invention, since it is air-insulated, a refractory castable is not required, and the cost is reduced.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing the skid button device 3 supporting a material to be heated 90, and FIG.
2 is a longitudinal sectional view showing the skid button device 3 according to the embodiment of the present invention, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG.
FIG. 7 is a sectional view taken along line BB of FIG. It is attached to the skid button holder 2 welded to the upper surface of the skid pipe 1 and supports the material to be heated 90 such as a slab and a billet in a walking beam type heating furnace / heat treatment furnace from below and swings the material to be heated 90 Is configured as follows.

The skid pipe 1 is a cocoon-shaped mild steel pipe that is long in the vertical direction, and its surface is covered with a refractory heat-insulating material as will be described later. The skid button device 3 has a short tube 3a formed by cutting a commercially available heat-resistant cast steel pipe formed by centrifugal casting as a main component,
The pin 4 is detachably fixed to the skid button holder 2.

The skid button holder 2 has a stainless steel round bar piece 2b inserted into the inner surface of a square frame 2a formed by welding four ordinary steel square bar pieces in order to simplify and reduce the cost. It is welded and configured as follows. That is, the round bar piece 2 is placed in the square frame 2a.
b is inserted and welded so that the lower end portion is inscribed,
Most of the upper part of the round bar piece 2b projects vertically above the square frame 2a. A pin hole 2c is formed in the upper part of the round bar piece 2b so that the pin 4 can be inserted in the horizontal direction.

The inside of the short tube 3a formed by cutting a pipe made of heat-resistant cast steel made by centrifugal casting is filled with a refractory castable 3b between the short tube 3a and the upper part of the round bar piece 2b, leaving a gap S at the upper end. . The reason for leaving the gap S is to reduce the area in direct contact with the material to be heated 90 and reduce heat removal from the material to be heated 90.

On the opposite side of the short tube 3a, pin holes 3c, 3c facing the pin hole 2c of the round bar piece 2b in the horizontal direction.
3c is drilled, and by inserting the pin 4 into the pin holes 3c, 2c, 3c, the short pipe 3a externally fitted to the upper portion of the round bar piece 2b is prevented from coming off. Further, washers 4a, 4
a is fitted and welded. The insertion direction of the pin 4 is perpendicular to the moving direction of the material 90 to be heated, and the pin 4 and the round bar piece 2b and the pin 4 and the short pipe 3
The washer 4a can be made unnecessary by strengthening the connection with a. Other outer surfaces of the skid pipe 1
The lower part is covered with a refractory and heat-insulating layer 1c made of, for example, castable high alumina material, and the upper part and the lower part of the skid button device 3 are covered with a refractory and heat-insulating layer 1d made of ceramic fiber which has excellent refractory and heat-insulating properties and is easily removed.

Next, the operation will be described. The material to be heated 90 supported on the upper end surface of the short tube 3a in the walking beam type heating furnace / heat treatment furnace,
Heat treatment is performed while moving forward in the furnace. During this time, cooling water is passed through the skid pipe 1 and cooled, but since the surface is covered with the refractory and heat-insulating layers 1c and 1d, heat is removed from the high-temperature material to be heated 90 to the skid pipe 1 by radiation. Is extremely small. In addition, the heat removal by the skid button device 3 also includes the lower portion covered with the refractory heat insulating layer 1d and the skid pipe 1
The portion located far from is filled with a refractory castable 3b, which has a long and thin heat transfer path, and has high heat insulation, and is further insulated by the gap S formed at the upper portion. Smaller than the conventional example covered with a metal surface.

If the skid button device 3 is burned, broken or worn due to long-term operation and needs to be replaced, the following measures are taken. That is, first, the easily removable ceramic fiber refractory and heat-insulating layer 1d is peeled off, and when the end face of the pin 4 is hit with a hammer or the like, the welded portion between the pin 4 and the washer 4a comes off. Thereby, the pin 4 can be pulled out, and the short tube 3a can be easily removed from the round bar piece 2b. The installation of the new short pipe 3a is also opposite to the above-mentioned removal work, and the short pipe 3a is first fitted over the round bar piece 2b,
Next, the pin 4 is inserted, the washers 4a, 4a are fitted at both ends, welded to the pin 4, and covered with the fire-resistant and heat-insulating layer 1d. Exchange is also significantly easier than in the prior art.

In this embodiment, the short tube 3a is filled with the refractory castable 3b. However, as shown in FIG. Good. According to this, the air is thermally insulated more strongly than the skid button device 3 shown in FIG. 2, and the heat removal is also smaller than that of the conventional example. In this case, the refractory castable 3b becomes unnecessary, and the cost is reduced.

[0020]

As described above, according to the first aspect of the present invention, since the heat insulating property is excellent and the heat removal from the material to be heated is small, the generation of skid marks can be prevented. Moreover,
Compared with the conventional example, there is no need for a mold and there is no need to cast one by one, and it can be easily manufactured using a commercially available material, so that it is inexpensive and has few defects peculiar to a cast product. In addition, since it is not necessary to perform complicated operations such as fusing of the base with the pedestal and welding for mounting a new product, the replacement is extremely easy.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the operation and effect of the invention, the air is strongly insulated and it is not necessary to fill the short pipe with the refractory castable, so that the cost is further reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a skid button device 3 supporting a material 90 to be heated.

FIG. 2 is a longitudinal sectional view showing the skid button device 3 according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a longitudinal sectional view showing another skid button device 5;

FIG. 6 is a longitudinal sectional view showing a skid button device 30 according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Skid pipe 1c Fireproof heat insulation layer 1d Fireproof heat insulation layer 2 Skid button holder 2a Square frame 2b Round bar piece 2c Pin hole 3 Skid button device 3a Short pipe 3b Fireproof castable 3c Pin hole 4 Pin 4a Washer 5 Skid button device 10 Skid pipe 20 Pedestal 30 Skid button device 31 Cylindrical case 32 Ceramic 90 Material to be heated C Fireproof insulation material S Gap

Continuation of the front page (56) References JP-A-4-341513 (JP, A) JP-A-3-118500 (JP, U) JP-A-2-149497 (JP, U) JP-B-4-57727 (JP) , B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) C21D 1/00 116 F27B 9/24 F27D 3/02

Claims (2)

(57) [Claims] (1) Welding on the upper surface of a horizontal skid pipe covered with a refractory material, and also for welding four ordinary steel square bar pieces.
Under the stainless steel round bar piece on the inner surface of the formed square frame
Skid buttonhole welded with inscribed ends
A skid button device which is attached to a holder, supports the material to be heated from below, and moves the material to be heated by swinging, wherein the lower end face is squarely fitted to the upper part of the round bar piece of the skid button holder. A short pipe formed by cutting a heat-resistant cast steel pipe made of centrifugally cast heat-resistant steel held on the upper surface of the frame, a refractory castable filled in the short pipe with a gap left at an upper end of the short pipe, and A skid button device comprising: a rod piece; and a pin that is inserted into a pin hole formed in a horizontal direction in the short pipe so as to detachably attach the short pipe to the round rod piece. 2. The skid button device according to claim 1, wherein the short pipe is left hollow instead of being filled with a refractory castable.