JP6973974B2 - Heat resistant structure - Google Patents

Description

The present invention relates to a heat resistant structure.

Since the ceiling and lid of the container that holds the molten metal are exposed to the heat from the held molten metal, heat resistance is required. These heat-resistant structures such as ceilings and lids are configured to have a block-shaped refractory on the inner peripheral surface of the iron skin. That is, these heat-resistant structures have a structure in which a block-shaped non-firing refractory is suspended on the inner peripheral surface of the iron skin.

As a general method of lifting a refractory, a method of combining refractories to form an arch and restraining them from the surroundings, a method of combining uneven portions provided on the refractory and restraining them from the surroundings, and a method of restraining the refractory from the surroundings are made of metal. A method is known in which a member (metal fitting) is embedded and molded, or a metal fitting is embedded in a refractory by post-processing, and then the metal fitting is welded and fixed to an iron skin.

In the method of embedding the metal fittings in the refractory and welding the metal fittings to the iron skin, the contact area between the metal fittings and the refractory material is wide, and the refractory material can be restrained with a large force. In addition, in this method, the metal fittings are embedded in the refractory and processed, so even if the refractory material receives heat and thermally expands, the metal fittings expand further and the restraint becomes stronger, making it difficult for the metal fittings to come off the refractory material. It was.

A heat-resistant structure having this configuration is described in, for example, Patent Document 1. Patent Document 1 describes a method of embedding a metal fitting in a refractory and suspending it from a metal iron skin (structure) in order to facilitate repair of the refractory. In this method, the metal fittings are slidably suspended from a ceiling structure such as a blast furnace pig iron cover, and the suspended refractory is restrained by a metal side wall to fix the refractory.

However, since the ceiling structure of Patent Document 1 is manufactured by embedding metal fittings in a refractory material, the positional accuracy of the embedded metal fittings tends to be low. If the position accuracy of the metal fittings is low, when the refractory material is hung from the iron skin and assembled, the amount of joint opening between the refractory materials will vary, and the joints of the refractory material will be damaged in advance or the joints will be opened due to damage. There was a risk that the metal hanging metal fittings and skin members would be deformed due to the infiltration of heat.

On the other hand, in the method of embedding the metal fittings in the refractory and welding the metal fittings to the iron skin, it is difficult to accurately embed the metal fittings depending on the molding conditions of the refractory material. For example, when embedding metal fittings in a fixed form brick for press molding, the mold is filled with a raw material (raw material powder) for bricks, the metal fittings are also installed in the mold in the process, and then press molding (compression molding) is performed. In this case, the raw material powder of the brick flowed during press molding, and the position and orientation of the metal fittings deviated from the installation position in the mold. In order to prevent the metal fittings embedded in the refractory from slipping, there is a method of installing a fixing jig for fixing the metal fittings to the mold. However, it is necessary to change the position of the metal fittings embedded in the refractory depending on the assembly position of the refractory. In other words, it was troublesome and costly because it was necessary to make a jig for each refractory and replace it. Further, removing the jig from the refractory molded body has also been a factor in increasing the cost.

Jitsukaisho 61-114298 Gazette

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat-resistant structure for accurately fixing a refractory material to a skin member regardless of the dimensional accuracy of the refractory material.

The heat-resistant structure of the present invention that solves the above-mentioned problems is a heat-resistant structure having a heat-resistant metal skin member and a refractory material arranged on the back surface side of the skin skin member. , The protrusion has a protrusion protruding from the surface facing the skin member, the protrusion integrally has a flange portion extending in the radial direction, and the skin member penetrates at a position corresponding to the protrusion with a diameter smaller than that of the flange portion. It is characterized in that a hole is formed and a flange portion that covers the through hole is welded.

The heat-resistant structure of the present invention has a flange portion extending in the radial direction at a protruding portion protruding from the refractory material. Then, the flange portion and the skin member are fixed by welding. In this configuration, welding and fixing can be performed even if the positional accuracy between the flange portion and the skin member is low. That is, the heat-resistant structure of the present invention can accurately fix the refractory material to the skin member.

It is a partially enlarged sectional view which shows the structure of the ceiling structure 1 of Embodiment 1. FIG. It is a top view of the refractory 4 of the ceiling structure 1 of Embodiment 1. FIG. It is a partially enlarged sectional view of the refractory 4 of the ceiling structure 1 of Embodiment 1. FIG. It is a partially enlarged sectional view which shows the structure of the ceiling structure 1 of Embodiment 2. FIG. It is a partially enlarged sectional view which shows the structure of the ceiling structure 1 of Embodiment 3. FIG.

Hereinafter, the heat-resistant structure of the present invention will be specifically described using a ceiling structure as an embodiment.

[Embodiment 1]
As shown in the cross section of FIG. 1, the ceiling structure 1 of the present embodiment has an iron skin 2, a heat insulating material 3, a refractory material 4, a bolt 5, and a welding piece 6. The ceiling structure 1 of the present embodiment is a structure that forms the ceiling of the container that holds the molten metal and the lid of the container that holds the molten metal. In this embodiment, in the ceiling structure 1, the surface on the side where the molten metal is located is the back surface side, and the surface facing the back surface is the front surface. The lower side in the vertical direction in FIG. 1 is the back surface side, and the upper side is the front surface side.

The iron skin 2 corresponds to a skin member and is formed by molding a plate-shaped heat-resistant metal. The iron skin 2 is a member for suspending and fixing the refractory 4 to the lower side of the ceiling structure 1. The shape of the iron skin 2 is not limited as long as it can be assembled in a container that holds the molten metal.

The thickness of the plate-shaped heat-resistant metal of the iron skin 2 is not limited. The thickness can be the same as that of the conventional ceiling structure 1. Further, the material of the heat-resistant metal (metal composition) is not limited. In this embodiment, it is formed of an iron plate having a thickness of 6 mm.
The iron skin 2 has a through hole 21 formed at a position corresponding to the bolt 5 described later. The shape and size of the through hole 21 are not limited. In this embodiment, it is a hole having an opening of φ30 mm.

The heat insulating material 3 is a plate-shaped member having a predetermined thickness arranged on the back surface side (lower side in the vertical direction in FIG. 1) of the iron skin 2. The heat insulating material 3 of the present embodiment has a front surface heat insulating material 31 arranged in contact with the back surface 2a of the iron skin 2, and a back surface heat insulating material 32 arranged in contact with the back surface side of the surface heat insulating material 31. It has a structure in which layers are laminated. The heat insulating material 3 is arranged between the refractory material 4 and the iron skin 2, and suppresses heat transfer from the refractory material 4 to the iron skin 2.
In this embodiment, the heat insulating material 3 is formed by laminating two layers of the front surface heat insulating material 31 and the back surface heat insulating material 32, but the structure is not limited to this. It may be one layer or three or more layers.
Further, in the present embodiment, the heat insulating material 3 is arranged between the iron skin 2 and the refractory material 4, but the heat insulating material 3 may not be arranged.
The presence or absence of the heat insulating material 3 and the number of layers are appropriately determined according to the required heat resistance and heat insulating property.

The thickness, material, and the like of the front surface heat insulating material 31 and the back surface heat insulating material 32 of the heat insulating material 3 are not limited. It can be the same as the heat insulating material of the conventional ceiling structure 1. In this embodiment, as the back surface heat insulating material 32 and the front surface heat insulating material 31, a plate-shaped molded body of crystalline alumina short fibers was used. In this embodiment, the heat insulating material of the same material is used for the back surface heat insulating material 32 and the front surface heat insulating material 31, but different materials may be used. It is preferable that the back surface heat insulating material 32 exposed to heat of a higher temperature has higher heat resistance and heat insulating property than the front surface heat insulating material 31.

In the heat insulating material 3, spaces 33 and 34 are formed in a portion corresponding to the welding piece 6 so as to accommodate the welding piece 6. The front surface heat insulating material 31 is formed with a space 33 for accommodating the flange portion 62 of the weld piece 6, and the back surface heat insulating material 32 is formed with a space 34 for accommodating the nut portion 61 of the weld piece 6. The spaces 33 and 34 are formed so that the welding pieces 6 can be fitted when the welding pieces 6 are accommodated.

The refractory material 4 is a block-shaped member having a predetermined thickness arranged on the back surface side (lower side in the vertical direction in FIG. 1) of the heat insulating material 3. In the ceiling structure 1 of the present embodiment, the refractory material 4 is a member facing the molten metal held in the container. The refractory material 4 suppresses the transfer of heat from the molten metal toward the iron skin 2.

As shown in the top view in FIG. 2 and the cross-sectional view in FIG. 3, the refractory material 4 is fixed with a cap nut 41 embedded therein. The cap nut 41 is a nut with one side closed, one closed side is located on the back surface side (lower side in the vertical direction in FIG. 1), and the opposite open side is the surface 4b side of the refractory material 4 (FIG. 1). It is embedded in the refractory 4 in a state of being opened (upper side in the vertical direction inside). The cap nut 41 does not penetrate the refractory material 4. That is, the end portion 42 on the back surface side of the cap nut 41 is provided in a state of being embedded in the refractory material 4. The cap nut 41 preferably has an uneven shape on the outer peripheral surface. With this configuration, the surface area increases and the binding force fixed to the refractory 4 increases.
The cap nut 41 is fixed by screwing the lower end portion 51 of the bolt 5.

The number of cap nuts 41 in the refractory 4 is not limited. The number of cap nuts 41, the arrangement interval, and the like are determined so that the block-shaped refractory 4 can be fixed to the iron skin 2. In this embodiment, four cap nuts 41 are provided in a rectangular shape at equal intervals on one of the refractory objects 4 having a substantially rectangular surface 4b.

The specific configuration of the refractory material 4, such as thickness and material, is not limited. It can be the same as the refractory material of the conventional ceiling structure 1. In this embodiment, the refractory material 4 is formed by molding (press molding) a heat-resistant inorganic material powder (ceramic powder). The refractory material 4 of this embodiment is formed in a rectangular block shape having a thickness of 100 mm or more in the vertical direction.

The bolt 5 is a rod-shaped member whose lower end portion 51 is screwed and fixed to the cap nut 41. The bolt 5 is integrally fixed to the refractory material 4 by being screwed into the cap nut 41. The bolt 5 is fixed to the refractory material 4, and the upper end portion 52 protrudes from the surface 4b of the refractory material 4. The bolt 5 corresponds to a protrusion.

The bolt 5 is integrally fixed with the welded piece 6 in a screwed state. The weld piece 6 has a flange portion 62 as described later, and when the weld piece 6 is fixed to the bolt 5, the flange portion 62 spreads along the radial direction of the bolt 5 (protruding portion).
The weld piece 6 has a nut portion 61 and a flange portion 62.
The nut portion 61 is screwed with the bolt 5. As a result, the weld piece 6 is fixed to the bolt 5.

The flange portion 62 has a plate shape extending along the upper surface of the nut portion 61. The flange portion 62 has a plate shape in which both sides extend along the radial direction of the bolt 5 (the direction perpendicular to the axial direction of the bolt 5) when the weld piece 6 is fixed to the bolt 5.

The plate-shaped flange portion 62 has a shape having a diameter larger than that of the through hole 21. According to this shape, when the iron skin 2 is placed on the refractory material 4, at least a part of the flange portion 62 is formed so as to cover the opening edge of the through hole 21 of the iron skin 2, and is fixed by welding as described later. Is possible. As in this embodiment, the flange portion 62 has a shape that closes the through hole 21 when the bolt 5 inserts the through hole 21 (a shape that covers the opening of the through hole 21, that is, a shape larger than the through hole 21). Is preferable. It is more preferable that the flange portion 62 has a shape that completely closes the through hole 21.

The specific configuration of the welded piece 6 is not limited as long as it has a nut portion 61 and a flange portion 62. In this embodiment, a metal plate (specifically, thickness 6 mm, φ50 mm) forming a flange portion 62 is formed on a metal nut (specifically, an M12 hexagon nut specified in JIS B 1181) forming the nut portion 61. ) Is welded and fixed integrally.
The welding piece 6 having the nut portion 61 and the flange portion 62 is fixed by welding a metal nut to a metal plate, but it may be configured to be threaded on the metal plate.

The weld piece 6 is fixed at a position where the surface 62b of the flange portion 62 coincides with the surface 3b of the heat insulating material 3. In this state, the heat insulating material 3 is sandwiched and fixed between the surface 4b of the refractory material 4 and the flange portion 62 of the welded piece 6.

Similar to the surface heat insulating material 31, the flange portion 62 of the welded piece 6 is arranged in a state where the surface 62b is in contact with the back surface 2a of the iron skin 2 and the through hole 21 is closed. At this time, the bolt 5 is in a state of penetrating the through hole 21. The flange portion 62 is welded and fixed to the iron skin 2. Further, when the flange portion 62 and the iron skin 2 are welded and fixed (when welding is performed), the welding small pieces 6 and the bolts 5 may be welded and fixed together.

(Manufacturing method of this embodiment)
The manufacturing method of the ceiling structure 1 of the present embodiment is not limited. For example, it can be manufactured by the following method.

First, the refractory material 4 is manufactured. In the production of the refractory material 4, the cap nut 41 is placed at a predetermined position in the mold, and the ceramic powder is put into the mold. Then, compression molding is performed under predetermined compression conditions. As a result, a refractory material 4 having a predetermined block shape in which the cap nut 41 is embedded and fixed is manufactured.
The refractory material 4 may be added with various additives or subjected to a firing step, if necessary.

Then, a plurality of block-shaped refractories 4 are arranged and joined with a joining material (resin mortar). In this embodiment, 25 block-shaped refractories 4 are arranged in a size of 5 × 5. At this time, the surfaces 4b are arranged and joined so as to face upward.

Further, the back surface heat insulating material 32 and the front surface heat insulating material 31 are arranged on the array of the refractory material 4 in an overlapping manner. At this time, the back surface heat insulating material 32 and the front surface heat insulating material 31 are attached and fixed in a state where the spaces 34 and 33 correspond to the positions of the cap nuts 41. The spaces 34 and 33 may be formed in advance on each of the back surface heat insulating material 32 and the front surface heat insulating material 31, or may be formed by cutting, drilling, or the like after being attached.
After that, the welding pieces 6 are inserted and arranged in the spaces 33 and 34. At this time, the cap nut 41 and the nut portion 61 of the welding piece 6 are coaxial.
With the welding piece 6 penetrating, the bolt 5 is inserted into the cap nut 41 and screwed. The weld piece 6 is integrally fixed to the bolt 5. The bolt 5 is integrally fixed to the cap nut 41 (refractory material 4).

Then, it is arranged so as to cover the metal plate forming the iron skin 2. At this time, the surface 62b of the flange portion 62 of the welded piece 6 and the surface 31b of the surface heat insulating material 31 are arranged in contact with the back surface 2a of the iron skin 2.

Then, the flange portion 62 of the welding piece 6 and the iron skin 2 are welded and joined. In this embodiment, the portion where the surface 62b of the flange portion 62 and the inner peripheral surface of the through hole 21 intersect is welded. Further, the flange portion 62 of the welding piece 6 and the bolt 5 are also welded together.
Then, if necessary, the bolt 5 is cut at a portion protruding from the flange portion 62. Preferably, it is cut so as not to protrude from the surface 2b of the iron skin 2.
As described above, the ceiling structure 1 of this embodiment is manufactured.

(Action and effect of this embodiment)
The ceiling structure 1 of the present embodiment has an iron skin 2 (skin member) made of heat-resistant metal, a heat insulating material 3 arranged on the back surface 2a side of the iron skin 2, and a fire resistance arranged on the back surface 3a side of the heat insulating material 3. It has a thing 4. The refractory material 4 has a bolt 5 (projecting portion) protruding from the surface 4b, which is a surface facing the heat insulating material 3. The bolt 5 integrally has a flange portion 62 extending in the radial direction. In the iron skin 2, a through hole 21 having a diameter smaller than the outer shape of the flange portion 62 is formed at a position corresponding to the bolt 5, and the flange portion 62 is in a state where the shaft of the bolt 5 penetrates the through hole 21. It is welded.

According to this configuration, the refractory 4 is fixed by welding the flange portion 62 integrally fixed to the refractory 4 to the iron skin 2. Then, welding is performed in a state where the flange portion 62 and the iron skin 2 are positioned with each other. That is, the ceiling structure 1 of the present embodiment can fix the refractory 4 to the iron skin 2 with high accuracy regardless of the dimensional accuracy of the refractory 4.

In this embodiment, since welding is performed with the flange portion 62 and the iron skin 2 positioned with each other, the shape of the refractory material 4 may vary (the dimensional accuracy of the refractory material 4 may be low), or the cap nut 41 may be used. And even if the position of the bolt 5 screwed to it varies, or the bolt 5 protrudes in the protruding direction (the bolt 5 tilts and protrudes), the refractory material 4 on the iron skin 2 as designed. Can be placed and fixed.

In this embodiment, the heat insulating material 3 is arranged between the iron skin 2 and the refractory material 4. According to this configuration, heat transfer from the refractory material 4 to the iron skin 2 can be suppressed more reliably.
In the ceiling structure 1 of the present embodiment, the flange portion 62 is in close proximity to the back surface 2a of the iron skin 2 (for example, the front surface 62b of the flange portion 62 is in contact with or in close contact with the back surface 2a of the iron skin 2). Will be welded in.
The ceiling structure 1 of the present embodiment is provided at a position where the bolt 5 penetrates the through hole 21. According to this configuration, positioning can be performed by the bolt 5 and the through hole 21.

The ceiling structure 1 of the present embodiment has a rod shape in which a bolt 5 is fixed by screwing an end portion (one end portion) located on the lower side to a cap nut 41 embedded in a refractory material 4. According to this configuration, the refractory material 4 in which the cap nut 41 is embedded can be manufactured, and by screwing the bolt 5, the refractory material 4 in which the bolt 5 is integrated can be manufactured. Compared with the case of manufacturing the refractory material 4 in which the bolt 5 is embedded, the cost required for manufacturing can be reduced.
The ceiling structure 1 of this embodiment is formed by press-molding a refractory material 4. According to this configuration, a refractory material having a predetermined shape can be easily manufactured.

[Embodiment 2]
In the ceiling structure 1 of the present embodiment, as shown in the cross section in FIG. 4, the flange portion 62 of the welded piece 6 is welded in a state of being arranged on the surface 2b side of the iron skin 2, and the heat insulating material 3 is provided. It has the same configuration as the above-mentioned form 1 except that it has one layer. The configuration and the like not specifically mentioned are the same as those in the above-mentioned form 1.
The ceiling structure 1 of the present embodiment has an iron skin 2, a heat insulating material 3, a refractory material 4, a bolt 5, and a welding piece 6 as in the above embodiment 1. In this embodiment, the upper end portion 52 of the bolt 5 protrudes from the surface 2b of the iron skin 2.
The heat insulating material 3 is made of an integral plate-shaped member formed only of the back surface heat insulating material 32 of the above-mentioned embodiment 1.

In the ceiling structure 1 of the present embodiment, the heat insulating material 3 is laminated on the refractory material 4, and the bolt 5 is screwed into the cap nut 41. After that, the iron skin 2 is placed at a predetermined position, and the welding piece 6 is assembled to the bolt 5. Then, the back surface 62a of the flange portion 62 is in contact with the surface 2b of the iron skin 2, and the flange portion 62 and the flange portion 62 are welded to and fixed to the iron skin 2.
The ceiling structure 1 of the present embodiment has the same configuration as that of the above-mentioned embodiment 1 except that the flange portion 62 is welded in a state of being arranged on the surface 2b side of the iron skin 2, and exhibits the same effect. do.

In the ceiling structure 1 of the present embodiment, the flange portion 62 is welded in a state of being in close contact with the surface 2b of the iron skin 2. According to this configuration, the entire circumference of the outer periphery of the flange portion 62 is located on the surface 2b side of the iron skin 2.

[Embodiment 3]
The ceiling structure 1 of the present embodiment has the same configuration as that of the above-described first embodiment except that the bolt 5 is provided at a position where the bolt 5 does not penetrate the through hole 21, as shown in the cross section in FIG. It is the same as the above-mentioned mode 1 except for the configuration not specifically mentioned.
The ceiling structure 1 of the present embodiment has an iron skin 2, a heat insulating material 3, a refractory material 4, a bolt 5, and a welding piece 6 as in the above embodiment 1.

In the ceiling structure 1 of the present embodiment, the end surface of the upper end portion 52 of the bolt 5 is formed so as to coincide with the surface 62b of the flange portion 62 of the welded piece 6. That is, the upper end 52 of the bolt 5 does not protrude from the surface 62b of the flange 62. The upper end 52 of the bolt 5 may be on the surface side of the surface 62b of the flange portion 62.
The flange portion 62 has a shape that closes the through hole 21 (that is, a shape that can close the opening of the through hole 21) when the ceiling structure 1 is formed (that is, when the iron skin 2 is put on the refractory material 4). , A shape larger than the through hole 21).

In the ceiling structure 1 of the present embodiment, the heat insulating material 3 is laminated on the refractory material 4, and the bolt 5 is screwed into the cap nut 41. After that, the welding piece 6 is assembled to the bolt 5. Then, the iron skin 2 is put on the surface 62b of the flange portion 62 so as to be in contact with the back surface 2a of the iron skin 2. At this time, the bolt 5 is in a position where it does not overlap with the through hole 21. Then, the flange portion 62 and the iron skin 2 are welded and fixed.
The ceiling structure 1 of the present embodiment has the same configuration as that of the above-described first embodiment except that the bolt 5 is provided at a position where the bolt 5 does not penetrate the through hole 21, and exhibits the same effect.

[Other forms]
In the above embodiment, the configuration in which the present invention is applied to the ceiling structure 1 is described. The heat-resistant structure of the present invention is not limited to the ceiling structure 1. For example, it may be used for a container for molten metal, a furnace wall or a furnace bottom of a heating furnace. In this case, the refractory material 4 is used in a state of facing the molten metal or the inside of the furnace.

1: Ceiling structure 2: Iron skin 21: Through hole 3: Insulation material 31: Front surface insulation material 32: Back surface insulation material 4: Refractory material 41: Cap nut 5: Bolt 6: Welded small piece 61: Nut part 62: Flange part 2a, 62a: Back surface 2b, 3b, 31b, 4b, 62b: Front surface

Claims (6)

A skin member made of heat-resistant metal and
The refractory material arranged on the back surface side of the skin member and
It is a heat-resistant structure having
The refractory material has a protrusion protruding from the surface facing the skin member.
The protruding portion integrally has a flange portion extending in the radial direction.
The skin member has heat resistance, characterized in that a through hole having a diameter smaller than that of the flange portion is formed at a position corresponding to the protrusion, and the flange portion that covers the through hole is welded. Structure. The heat-resistant structure according to claim 1, wherein a heat insulating material is arranged between the skin member and the refractory material. The heat-resistant structure according to any one of claims 1 to 2, wherein the flange portion is welded in a state of being close to the back surface of the skin member. The heat-resistant structure according to any one of claims 1 to 2, wherein the flange portion is welded in a state of being close to the surface of the skin member. The heat-resistant structure according to any one of claims 1 to 4, wherein the protruding portion has a bolt whose one end is screwed and fixed to a nut embedded in the refractory. The heat-resistant structure according to any one of claims 1 to 5, wherein the refractory is press-molded.

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