JP5103797B2 - Refractory hearth of walking hearth furnace - Google Patents

Refractory hearth of walking hearth furnace Download PDF

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JP5103797B2
JP5103797B2 JP2006160660A JP2006160660A JP5103797B2 JP 5103797 B2 JP5103797 B2 JP 5103797B2 JP 2006160660 A JP2006160660 A JP 2006160660A JP 2006160660 A JP2006160660 A JP 2006160660A JP 5103797 B2 JP5103797 B2 JP 5103797B2
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hearth
block
refractory
corner block
corner
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JP2007327714A (en
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尚平 西田
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Daido Steel Co Ltd
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Description

本発明は、耐火性のブロックを多数個並設することにより構成されるウオーキングハース炉の耐火性炉床に関するものである。   The present invention relates to a refractory hearth of a walking hearth furnace configured by arranging a large number of refractory blocks in parallel.

一般にウオーキングハース炉は、鋼片（ビレット）を固定炉床と可動炉床に交互に支持させて炉内を搬送するもので、搬送時に鋼片が固定炉床や可動炉床の縁部（コーナー部）に接触し衝撃を与えるために、その炉床耐火物が減耗、又は割損し易いものであった。
また、従来のウオーキングハース炉の耐火性炉床は、下記特許文献１にも示されたように、上記縁部を不定形耐火物（キャスタブル）により形成したものであった。
特開昭４９−９１００７号公報 In general, a walking hearth furnace conveys steel billets (billets) alternately between a fixed hearth and a movable hearth and transports them inside the furnace. ) And the hearth refractory was easily worn or damaged.
Moreover, the refractory hearth of the conventional walking hearth furnace is one in which the edge is formed of an indeterminate refractory (castable) as shown in Patent Document 1 below.
JP-A-49-91007

ところが、不定形耐火物は水分を多く含ませて型枠に流し込んで自然乾燥させるものであるので、自然乾燥および型枠除去の工程に多大な時間を費やし、施工期間が長くなると共に、自然乾燥後も内部に多量の水分を含有するため、炉内にて焼成される際にその水分が水蒸気化し、内部応力が生じて破裂・崩壊を引き起こす危険性がある。
また、不定形耐火物は、予め成形・焼成された定形ブロック（定形レンガ）と比較すると概して耐熱温度が低く、鋼片との接触により減耗し易いので寿命が短いという問題があるほか、鋼片から受ける荷重、衝撃によってクラックが発生するとそのクラックが周囲にも波及し崩落し易く、一気に搬送トラブルを招くおそれがあるなどの問題がある。 However, amorphous refractories contain a lot of moisture and are poured into the formwork and let it dry naturally. Therefore, a lot of time is spent on the process of natural drying and formwork removal, and the construction period becomes longer. Since a large amount of moisture is contained in the interior, the moisture is vaporized when fired in the furnace, and there is a risk of causing internal stress to cause rupture / collapse.
In addition, amorphous refractories generally have a lower heat-resistant temperature compared to pre-formed and fired shaped blocks (shaped bricks), and they tend to wear out due to contact with steel slabs, resulting in a short life. When a crack is generated by a load or an impact received from the surface, the crack easily spreads to the surrounding area and collapses, which may cause a trouble in transportation at a stretch.

そこで、本発明に係るウオーキングハース炉の耐火性炉床は、不定形耐火物に依らず、予め成形・焼成されたコーナーブロックによって縁部が容易に形成されるようにし、上記問題点を解決しようとするものである。   Therefore, the refractory hearth of the walking hearth furnace according to the present invention is not dependent on the irregular refractory, so that the edge is easily formed by the pre-formed and fired corner block to solve the above problems. It is what.

そのために請求項１に記載したウオーキングハース炉の耐火性炉床は、側面が略Ｌ形なるように予め成形・焼成されたコーナーブロックをその起立辺部が外側となるように炉床基盤の側縁に隣接状に並設するとともに、定形ブロックを隣接する該各コーナーブロックの水平辺部上に跨るように載置し、該定形ブロックの荷重により該各コーナーブロックが炉床基盤の側縁に移動不能に保持されるようにしたことを特徴とする。
このため、定形ブロックの重力がコーナーブロックの水平辺部上に掛かり、各コーナーブロックが振動、衝撃等によって無用に移動することがない堅固なものになる。
また、請求項２に記載した発明は、上記耐火性炉床において、水冷管が埋設された炉床基盤の側縁材に上面が内向傾斜状の斜面部を形成するとともに、コーナーブロックの踵部下面に該斜面部に沿う切欠面を形成し、該切欠面が前記斜面部上に当たるように該コーナーブロックを並設したことを特徴とする。
このため、コーナーブロックの重力が斜面部に掛かることにより該コーナーブロックに内向きに動こうとする力が掛かるので、ブロック同士が常に隙間無く整然とした状態に保形され堅固なものとなる。 For this purpose, the refractory hearth of the walking hearth furnace according to claim 1 is a side of the hearth base so that the side of the corner block that has been molded and fired in advance so that the side surface is substantially L-shaped, the rising side is the outside. Adjacent to the edge, the fixed block is placed so as to straddle the horizontal side of each adjacent corner block, and each corner block is placed on the side edge of the hearth base by the load of the fixed block. It is characterized by being held immovable.
For this reason, the gravity of the regular block is applied to the horizontal side of the corner block, and the corner block does not move unnecessarily due to vibration, impact, or the like.
The invention described in claim 2 is characterized in that, in the above-mentioned refractory hearth, the side wall of the hearth base in which the water-cooled pipe is embedded forms a slope portion whose upper surface is inclined inwardly, and the flange portion of the corner block A notch surface is formed on the lower surface along the slope portion, and the corner blocks are arranged side by side so that the notch surface hits the slope portion.
For this reason, when the gravity of the corner block is applied to the slope portion, a force to move inward is applied to the corner block, so that the blocks are always kept in an orderly state with no gaps and become firm.

本発明に係る耐火性炉床では、縁部の強度、耐久性が向上し、ブロック崩落の危険性が少なくできる。   In the refractory hearth according to the present invention, the strength and durability of the edge are improved, and the risk of block collapse can be reduced.

図１は本発明の実施形態を示すウオーキングハース炉の耐火性炉床の横断面図で、１ａ〜１ｃは固定炉床、２ａ，２ｂは可動炉床、３ａ，３ｂは炉壁である。なお、Ａは搬送物である鋼片を示す。該固定炉床１ａ〜１ｃおよび可動炉床２ａ，２ｂは、図２に中央の固定炉床１ｂについて拡大して示したように、Ｈ形鋼からなる枠体４の上面を耐熱性金属板からなる側縁材５により囲繞し、該側縁材５の内側に水冷管６を配設し、該水冷管と側縁材５の内面とに接合板７を溶接して連結し、該接合板７の上面に内向傾斜状（傾斜角約１１度）の斜面部８が形成されるようにする。そして、側縁材５の内側に不定形耐火物９を多層に形成することにより炉床基盤１０を構築する。   FIG. 1 is a cross-sectional view of a refractory hearth of a walking hearth furnace showing an embodiment of the present invention, wherein 1a to 1c are fixed hearths, 2a and 2b are movable hearths, and 3a and 3b are furnace walls. In addition, A shows the steel piece which is a conveyed product. The fixed hearths 1a to 1c and the movable hearths 2a and 2b are enlarged from the center fixed hearth 1b in FIG. 2, and the upper surface of the frame 4 made of H-shaped steel is formed from a heat-resistant metal plate. A water-cooled tube 6 is disposed inside the side edge member 5, and a joining plate 7 is welded and connected to the inner surface of the water-cooled tube and the side edge member 5. 7 is formed with an inwardly inclined surface 8 (inclination angle of about 11 degrees). And the hearth base 10 is constructed | assembled by forming the amorphous refractory 9 in multiple layers inside the side edge material 5. As shown in FIG.

図４、図５にも示したように、１１はコーナーブロックで、該コーナーブロックは、ケイ石、アルミナ等の耐火材料により水平辺部１１ａと起立辺部１１ｂとからなる側面略Ｌ形に成形し、該コーナーブロックの踵部下面には前記斜面部８に沿う切欠面１１ｃ（図４中の角度αが約１１度）を形成し、該切欠面と相対する上面に逃がし用の面取面１１ｄを形成し、これを高温度で焼成してなるものである。   As shown in FIGS. 4 and 5, 11 is a corner block, and the corner block is formed into a substantially L-shaped side surface composed of a horizontal side portion 11a and an upright side portion 11b by a refractory material such as silica or alumina. A notch surface 11c (angle α in FIG. 4 is approximately 11 degrees in FIG. 4) is formed on the lower surface of the flange portion of the corner block along the inclined surface portion 8, and a chamfering surface for relief is formed on the upper surface facing the notch surface. 11d is formed and fired at a high temperature.

そしてこのコーナーブロック１１を、起立辺部１１ｂが外側となるように、かつ切欠面１１ｃが前記斜面部８上に当たるように炉床基盤１０の側縁に隣接状に並設し、該各コーナーブロック１１の水平辺部１１ａ上に跨るように直方形等の定形ブロック１２を載置する。（ちなみに、図３に示されるように、定形ブロック１２の幅はコーナーブロック１１の幅の２倍程度のものとして成形される）。こうして定形ブロック１２の荷重により該各コーナーブロック１１が炉床基盤１０の側縁に移動不能に保持されるようにする。なお、１３は定形ブロック１２の内側で炉床基盤１０上平面を覆うように配置された方形板状の定形ブロックである。これらの定形ブロック１２、１３はコーナーブロック１１と同様にケイ石、アルミナ等の耐火材料によりそれぞれ直方形、或いは方形板状等に成形され、これを高温度で焼成したもので、該定形ブロック１２、１３を炉床基盤１０の側縁を除く全面に配置することにより、該炉床基盤１０が高温度から保護されるようにする。
なお、固定炉床１ａ，１ｃおよび可動炉床２ａ，２ｂについてもこの固定炉床１ｂと同様にコーナーブロック１１と定形ブロック１２、１３を配置することにより構築される。 The corner blocks 11 are arranged adjacent to the side edge of the hearth base 10 so that the upright side portion 11b is on the outside and the notch surface 11c is in contact with the slope portion 8, and each corner block 11 is arranged side by side. The rectangular block 12 such as a rectangular shape is placed so as to straddle the 11 horizontal sides 11a. (By the way, as shown in FIG. 3, the width of the regular block 12 is formed to be about twice the width of the corner block 11). In this way, each corner block 11 is held immovably on the side edge of the hearth base 10 by the load of the fixed block 12. Reference numeral 13 denotes a rectangular plate-shaped fixed block arranged so as to cover the upper surface of the hearth base 10 inside the fixed block 12. These fixed blocks 12 and 13 are each formed into a rectangular shape or a square plate shape using a refractory material such as silica and alumina in the same manner as the corner block 11 and fired at a high temperature. , 13 are arranged on the entire surface excluding the side edges of the hearth base 10 so that the hearth base 10 is protected from a high temperature.
The fixed hearths 1a and 1c and the movable hearths 2a and 2b are also constructed by arranging the corner block 11 and the fixed blocks 12 and 13 in the same manner as the fixed hearth 1b.

このように構成した耐火性炉床は、定形ブロック１２の重力がコーナーブロック１１の水平辺部１１ａ上に掛かり、該各コーナーブロック１１が振動、衝撃等によって無用に移動することがない堅固なものになる。また、１つの定形ブロック１２が隣り合うコーナーブロック１１の水平辺部１１ａ上に跨って載置されるようにしたことにより、その一方のコーナーブロックがたとえ破壊したとしても隣のコーナーブロック１１が定形ブロック１２を支持し得るので、搬送中に鋼片が１つのコーナーブロックに衝突して破壊したとしても定形ブロック１２が崩落し難くなると共に、１つのコーナーブロック１１にクラックが入ってもそのクラックが他のコーナーブロックにも伝播して崩落が大きくなるようなことがない。   The refractory hearth constructed in this way is a rigid one in which the gravity of the regular block 12 is applied to the horizontal side 11a of the corner block 11 and each corner block 11 does not move unnecessarily due to vibration, impact, etc. become. Further, since one fixed block 12 is placed on the horizontal side portion 11a of the adjacent corner block 11, even if one corner block is destroyed, the adjacent corner block 11 is fixed. Since the block 12 can be supported, even if the steel piece collides with one corner block and breaks during conveyance, the fixed block 12 is not easily collapsed. It will not propagate to other corner blocks and the collapse will not increase.

また、コーナーブロック１１の重力が斜面部８に掛かることにより該コーナーブロック１１には該斜面部８に沿って内向きに動こうとする力が掛かるので、ブロック同士が常に隙間無く整然とした状態に保形される。このため、一層堅固なものとなり、振動、衝撃等によりコーナーブロック１１がはみ出したり安易に脱落して搬送トラブルを起こすおそれがない。   Further, since the gravity of the corner block 11 is applied to the slope portion 8, a force to move inward along the slope portion 8 is applied to the corner block 11, so that the blocks are always in an orderly state without a gap. Shaped. For this reason, it becomes more firm, and there is no possibility that the corner block 11 protrudes or easily falls off due to vibration, impact or the like and causes a conveyance trouble.

本発明の実施形態を示すウオーキングハース炉の耐火性炉床の横断面図。The cross-sectional view of the refractory hearth of the walking hearth furnace showing the embodiment of the present invention. 図１の部分拡大図。The elements on larger scale of FIG. 図２の平面図。The top view of FIG. 本発明の実施形態を示すコーナーブロックの斜視図。The perspective view of the corner block which shows embodiment of this invention. 図４のコーナーブロックを他方面から見た斜視図。The perspective view which looked at the corner block of FIG. 4 from the other side.

符号の説明Explanation of symbols

１ａ〜１ｃ 固定炉床
２ａ，２ｂ 可動炉床
５ 側縁材
６ 水冷管
７ 接合板
８ 斜面部
１０ 炉床基盤
１１ コーナーブロック
１１ａ 水平辺部
１１ｂ 起立辺部
１１ｃ 切欠面
１２ 定形ブロック DESCRIPTION OF SYMBOLS 1a-1c Fixed hearth 2a, 2b Movable hearth 5 Side edge material 6 Water cooling pipe 7 Joint plate 8 Slope part 10 Hearth base 11 Corner block 11a Horizontal side part 11b Standing side part 11c Notch surface 12 Fixed block

Claims (2)

側面が略Ｌ形なるように予め成形・焼成されたコーナーブロックをその起立辺部が外側となるように炉床基盤の側縁に隣接状に並設するとともに、定形ブロックを隣接する該各コーナーブロックの水平辺部上に跨るように載置し、該定形ブロックの荷重により該各コーナーブロックが炉床基盤の側縁に移動不能に保持されるようにしたことを特徴とするウオーキングハース炉の耐火性炉床。   The corner blocks that are pre-shaped and fired so that the side faces are substantially L-shaped are juxtaposed side by side with the side edges of the hearth base so that the rising side is on the outside, and each corner block adjacent to the shaped block A walking hearth furnace characterized in that it is placed so as to straddle the horizontal side of the block, and each corner block is held immovably on the side edge of the hearth base by the load of the fixed block. Refractory hearth. 水冷管が埋設された炉床基盤の側縁材に上面が内向傾斜状の斜面部を形成するとともに、コーナーブロックの踵部下面に該斜面部に沿う切欠面を形成し、該切欠面が前記斜面部上に当たるように該コーナーブロックを並設したことを特徴とする請求項１に記載したウオーキングハース炉の耐火性炉床。   The side wall of the hearth base in which the water-cooled tube is embedded forms a slope portion whose upper surface is inclined inward, and a notch surface along the slope portion is formed on the bottom surface of the corner block, the notch surface being The refractory hearth of the walking hearth furnace according to claim 1, wherein the corner blocks are arranged side by side so as to hit the slope portion.
JP2006160660A 2006-06-09 2006-06-09 Refractory hearth of walking hearth furnace Expired - Fee Related JP5103797B2 (en)

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