JP2006313061A - Hearth carriage connection structure of rotary hearth furnace - Google Patents

Hearth carriage connection structure of rotary hearth furnace Download PDF

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JP2006313061A
JP2006313061A JP2006103171A JP2006103171A JP2006313061A JP 2006313061 A JP2006313061 A JP 2006313061A JP 2006103171 A JP2006103171 A JP 2006103171A JP 2006103171 A JP2006103171 A JP 2006103171A JP 2006313061 A JP2006313061 A JP 2006313061A
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hearth
carriage
cart
bogie
spacer
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JP4312774B2 (en
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Shinji Shima
真司 嶋
Toshitaka Nakayama
俊孝 中山
Tomoaki Shibata
智明 柴田
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Nippon Steel Corp
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Nippon Steel Corp
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Priority to JP2006103171A priority Critical patent/JP4312774B2/en
Priority to PCT/JP2006/318889 priority patent/WO2007113929A1/en
Priority to CN2006800545647A priority patent/CN101438117B/en
Priority to US12/226,033 priority patent/US8021602B2/en
Priority to EP06798273A priority patent/EP2006625B1/en
Priority to KR1020087024307A priority patent/KR101073115B1/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hearth carriage connection structure capable of preventing the floating up of an inner ring of a rotary hearth attendant on heating, avoiding breakage or trouble of a carriage caused by an excess load, and making unnecessary the control of the fastening amount every temperature change of preheating, cooling or the like. <P>SOLUTION: This hearth carriage connection structure comprises a plurality of hearth carriages 10 in which each hearth carriage 10 on which a hearth 5 is placed, has running devices 32-34, and adjacent hearth carriages 10 are connected through a spacer 21 with bolts and nuts in one line at certain intervals. Even if each hearth carriage 10 causes thermal deformation in operation, since it has structure capable of freely deforming without restricting each other to curved deformation, each hearth carriage 10 is always kept in a stable state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、鉄鉱石や製鉄廃棄物などの酸化鉄と炭材などの還元剤とからなる酸化鉄塊成物を加熱・還元して還元鉄塊成物を製造する回転炉床炉の炉床台車結合構造に関する。   The present invention relates to a hearth of a rotary hearth furnace in which a reduced iron agglomerate is produced by heating and reducing an iron oxide agglomerate composed of iron oxide such as iron ore and ironmaking waste and a reducing agent such as a carbonaceous material. The present invention relates to a truck coupling structure.

回転炉床炉は、走行装置を有する炉床台車上に炉床耐火物が設置されている。この炉床耐火物の上面に原料を積載し、原料を上方より加熱し、焼結・還元する。この炉床は、製作・運搬の観点で複数の炉床台車を環状に結合した構造となっている。その結合構造は、図１０に示す隣り合う炉床台車の部材１４ａ、１４ｂを溶接する溶接構造５０や、図１１に示す上下２段のボルト５３による多段ボルト締結構造５２により、炉底を一体構造にしていることが特徴であった。   In a rotary hearth furnace, a hearth refractory is installed on a hearth carriage having a traveling device. The raw material is loaded on the upper surface of the hearth refractory, and the raw material is heated from above to be sintered and reduced. This hearth has a structure in which a plurality of hearth carts are connected in an annular shape from the viewpoint of production and transportation. The joint structure is formed by integrating the bottom of the furnace with a welding structure 50 for welding the members 14a and 14b of adjacent hearth carts shown in FIG. 10 and a multi-stage bolt fastening structure 52 with upper and lower two-stage bolts 53 shown in FIG. It was the feature to have.

しかしながら、この回転炉床炉の炉床台車は、高温の炉内から熱を受け、上面の温度が下面の温度より高くなる。この結果、図１２（ａ）に示すように各炉床台車１０を一体構造にすると、熱膨張差で炉床台車１０の内周側車輪３２が浮き上がり、外周側車輪３３に過大な重量が集中して走行障害を引き起こすという問題があった。さらに、この内周側車輪３２の浮き上がりは、図１３に示すように炉床耐火物と炉壁耐火物との干渉を引き起こすという問題を有していた。   However, the hearth carriage of the rotary hearth furnace receives heat from the high temperature furnace, and the upper surface temperature becomes higher than the lower surface temperature. As a result, as shown in FIG. 12A, when each hearth cart 10 is integrated, the inner peripheral side wheel 32 of the hearth cart 10 is lifted due to the difference in thermal expansion, and excessive weight is concentrated on the outer peripheral side wheel 33. Then, there was a problem of causing running trouble. Further, the lifting of the inner peripheral side wheel 32 has a problem of causing interference between the hearth refractory and the hearth refractory as shown in FIG.

これらの問題を回避するためには、図１２（ｂ）に示す熱変形後の姿となるように各炉床台車１０が自由に動ける構造とする必要がある。従来、採用されていた図１１に示す多段ボルト結合構造５２は、炉床台車１０の熱変形に応じて徐々にナット５４を緩めることで炉床台車間の結合に自由を与えることができる構造である。しかし、炉が冷却した際にはボルト・ナット間に緩みが発生し、炉床台車１０間にガタが生じることが避けられなかった。したがって、冷間では炉床は円形を保つことはできず、回転に支障をきたすという欠点を有していた。それを防止するためには、操業による加熱や冷却等の温度変化のたびにボルト・ナットの締め付量を調整する必要がある問題があった。   In order to avoid these problems, it is necessary to have a structure in which each hearth cart 10 can freely move so as to have the shape after thermal deformation shown in FIG. The conventional multi-stage bolt coupling structure 52 shown in FIG. 11 is a structure that can give freedom to the coupling between the hearth trucks by gradually loosening the nuts 54 according to the thermal deformation of the hearth carriage 10. is there. However, when the furnace is cooled, loosening occurs between the bolts and nuts, and it is inevitable that looseness occurs between the hearth carts 10. Therefore, the hearth cannot keep a circular shape when it is cold, and it has a drawback that it hinders rotation. In order to prevent this, there is a problem that it is necessary to adjust the tightening amounts of the bolts and nuts every time the temperature changes such as heating or cooling due to operation.

本発明は、各炉床台車が自由に動けるような炉床台車構造とその結合手段を提供し、炉床が熱変形を生じた後も車輪が全て接地して回転することで、過大な荷重による台車破損や事故を回避すると共に、操業による加熱や冷却等の温度変化のたびにボルト・ナットの締め付量を調整することを不要とする炉床台車結合構造を提供するものである。   The present invention provides a hearth cart structure and its coupling means that each hearth cart can move freely, and the wheels are all grounded and rotated even after the hearth is thermally deformed, so that an excessive load is applied. It is intended to provide a hearth-cart combination structure that eliminates the need for adjusting the tightening amount of bolts and nuts every time temperature changes such as heating and cooling due to operation.

前記課題を解決するために、本発明による回転炉床炉の炉床台車結合構造は、炉床を載置している炉床台車がそれぞれ走行装置を有する複数の炉床台車からなり、隣り合う前記炉床台車の結合を、ボルト・ナットをスペーサーを介して水平面上で１列に間隔をおいて結合する構造としたことを特徴としている。   In order to solve the above-mentioned problem, the hearth cart combination structure of the rotary hearth furnace according to the present invention is composed of a plurality of hearth carts each having a traveling device, each of the hearth carts on which the hearth is mounted, and adjacent to each other. The connection of the hearth cart is characterized by a structure in which bolts and nuts are connected at intervals in a row on a horizontal plane via a spacer.

前記炉床台車結合構造において、スペーサーの長さδを下記式で導き出す長さとすることが好ましい。
δ≧０．５×α×ΔＴ×Ｗ×ｌ／Ｌ
α ： 台車フレーム主材料の線膨張係数
ΔＴ： 操業時における台車フレームの上面と下面との温度差
Ｗ ： 台車の長さ
ｌ ： 台車上面からスペーサー（結合ボルト）取り付け用孔までの距離
Ｌ ： 台車フレームの高さ In the hearth cart connection structure, it is preferable that the length δ of the spacer is a length derived from the following formula.
δ ≧ 0.5 × α × ΔT × W × l / L
α: Linear expansion coefficient of the main material of the bogie frame ΔT: Temperature difference between the upper and lower surfaces of the bogie frame during operation W: Length of the bogie l: Distance from the upper surface of the bogie to the spacer (coupling bolt) mounting hole L: Bogie Frame height

前記炉床台車結合構造において、炉床台車の移動用車輪は、当該炉床台車の下部に設けられており、各炉床台車において外周炉壁側に２個、内周炉壁側に１個またはこの逆に配置されていることが好ましい。   In the hearth cart connection structure, the wheel for moving the hearth cart is provided in the lower part of the hearth cart. In each hearth cart, two on the outer furnace wall side and one on the inner furnace wall side. Or it is preferable to arrange | position reversely.

前記炉床台車結合構造において、炉床の耐火物築造床と炉床台車とを別個に設け、互いに変位可能に結合することが好ましい。   In the hearth trolley coupling structure, it is preferable that the refractory building floor of the hearth and the hearth trolley are separately provided and coupled so as to be displaceable from each other.

本発明の炉床台車結合構造では、炉床台車を結合している結合ボルトが水平面上で１列に間隔をおいて配置されているので、各炉床台車が操業時に熱変形しても、湾曲状の変形に対しては相互拘束せずに自由に変形できる構造であるために、各炉床台車は常に個々に安定した状態に保たれる。また、結合ボルトがスペーサーを介して隣り合う炉床台車を結合しているので、操業時に熱変形で隣り合う台車どうしが接触しないように、台車間の隙間がスペーサーにより維持される。さらに、この隙間は台車間の角度が変化した場合に結合部の距離変化を最小にする働きをする。このような構造とすることで、結合ボルトはその曲げ応力および引張応力をボルト母材の許容応力内に抑えることができる。   In the hearth cart connection structure of the present invention, since the connecting bolts connecting the hearth cart are arranged in a row on the horizontal plane, even if each hearth cart is thermally deformed during operation, Each of the hearth carts is always kept in a stable state because it has a structure that can be freely deformed without being constrained against curved deformation. Moreover, since the coupling bolt couples the adjacent hearth carts via the spacers, the gap between the carts is maintained by the spacers so that the neighboring carts do not contact each other due to thermal deformation during operation. Further, this gap serves to minimize the change in the distance of the connecting portion when the angle between the carriages changes. By adopting such a structure, the connecting bolt can suppress the bending stress and tensile stress within the allowable stress of the bolt base material.

スペーサーの長さδを、
δ≧０．５×α×ΔＴ×Ｗ×ｌ／Ｌ
で求めれば、熱変形による隣り合う台車どうしの接触を防ぐことができる適正なスペーサー長さδを簡便に求めることができる。 The length δ of the spacer is
δ ≧ 0.5 × α × ΔT × W × l / L
Thus, an appropriate spacer length δ that can prevent contact between adjacent carts due to thermal deformation can be easily obtained.

炉床台車がその下部に移動用車輪を有し、各炉床台車において外周炉壁側に２個、内周炉壁側に１個またはこの逆に配置されている構造のものでは、操業に伴い台車フレームが熱変形した場合でも、すべての車輪は常時かつ確実にレールと接触し、レールおよび車輪に加わる負荷を一定にすることが可能で、レールおよび車輪の寿命を延ばすことができる。   In the case of a structure in which the hearth carriage has a moving wheel at its lower part, and each hearth carriage is arranged on the outer furnace wall side, two on the inner furnace wall side or vice versa, As a result, even when the bogie frame is thermally deformed, all the wheels always and reliably come into contact with the rail, the load applied to the rail and the wheel can be made constant, and the life of the rail and the wheel can be extended.

炉床の耐火物築造床と炉床台車とを別個に設け、互いに変位可能に結合した構造のものでは、操業に伴い炉床台車の台車フレームが熱変形しても、耐火物築造床に変形や外力等の影響が及ぶことがない。したがって、炉床台車の台車フレームが熱変形しても、炉床耐火物が破損することはない。   If the refractory building floor of the hearth and the hearth carriage are separately provided and connected to each other so as to be displaceable, even if the bogie frame of the hearth carriage is thermally deformed during operation, it is transformed into a refractory building floor. And no influence from external force. Therefore, even if the bogie frame of the hearth bogie is thermally deformed, the hearth refractory is not damaged.

図１〜４は、本発明の実施の一形態を示している。この実施の形態では、回転炉床炉１の炉床５は、複数台の炉床台車１０を結合装置２０により環状に結合して構成されている。炉床５は、耐火物築造床６および炉床材７で築造されている。耐火物築造床６は、台車上面鉄板８の上に配置されている。炉床台車１０は、主として台車フレーム１２、走行装置３０および台車上面鉄板支持金物４０からなっている。   1 to 4 show an embodiment of the present invention. In this embodiment, the hearth 5 of the rotary hearth furnace 1 is configured by connecting a plurality of hearth carts 10 in a ring shape by a connecting device 20. The hearth 5 is constructed with a refractory building floor 6 and a hearth material 7. The refractory building floor 6 is disposed on the carriage top surface iron plate 8. The hearth carriage 10 mainly includes a carriage frame 12, a traveling device 30, and a carriage upper surface iron plate support metal 40.

結合装置２０は、図３に示すようにスペーサー２１、結合ボルト２４、ナット２５，２６からなっている。複数の結合装置２０は、炉床台車１０の幅方向に沿い間隔をおいて配置されている。複数の結合装置２０は同一水平面上に整列する１列だけであり、上下複数段に配置されてはいない。炉床台車１０は、隣り合うもの例えば１０ａ、１０ｂどうしが、結合装置２０で結合されている。すなわち、操業停止（常温）状態では、図３に示すように後端縦部材１４ａｒのウエブ１５ａおよび前端縦部材１４ｂｆのウエブ１５ｂが鉛直かつ互いに平行となっている。隙間δに短管からなるスペーサー２１が挿入されている。隙間δは、操業実績または熱変形量の計算に基づいて操業時に熱変形で隣り合う台車どうしが接触しない大きさに設定されている。   As shown in FIG. 3, the coupling device 20 includes a spacer 21, a coupling bolt 24, and nuts 25 and 26. The plurality of coupling devices 20 are arranged at intervals along the width direction of the hearth cart 10. The plurality of coupling devices 20 are only one row aligned on the same horizontal plane, and are not arranged in a plurality of upper and lower stages. In the hearth cart 10, adjacent ones, for example, 10a and 10b are coupled by a coupling device 20. That is, in the operation stop (normal temperature) state, as shown in FIG. 3, the web 15a of the rear end vertical member 14ar and the web 15b of the front end vertical member 14bf are vertical and parallel to each other. A spacer 21 made of a short tube is inserted in the gap δ. The gap δ is set to a size such that adjacent carts do not come into contact with each other due to thermal deformation during operation based on the operation results or the calculation of the amount of thermal deformation.

結合ボルト２４が、隣り合うウエブ１５ａ、１５ｂおよび座金２８のボルト孔２９、ならびにスペーサー２１の軸穴２２を貫通している。ウエブ１５ａ、１５ｂをスペーサー２１を介して結合ボルト２４のナット２５で締め付けて、炉床台車１０ａと炉床台車１０ｂとを結合している。この状態では、スペーサー２１の両端全面がそれぞれウエブ１５ａ、１５ｂ面に接している。縦部材１４とボルト２４の頭部およびナット２５との間にそれぞれ座金２８が挿入されている。スペーサー２１は、短管に代えて環状のディスクであってもよい。なお、スペーサー２１の材質としては、操業に伴う台車の熱変形時にスペーサー２１にかかる圧縮応力に耐える強度と、２００〜２５０℃以上の耐熱温度を有するものであればよく、一般的な鋼製のもので十分に使用に耐える。   The connecting bolt 24 passes through the bolt holes 29 of the adjacent webs 15 a and 15 b and the washer 28 and the shaft hole 22 of the spacer 21. The webs 15a and 15b are tightened with the nuts 25 of the coupling bolts 24 via the spacers 21, and the hearth carriage 10a and the hearth carriage 10b are coupled. In this state, the entire surfaces of both ends of the spacer 21 are in contact with the surfaces of the webs 15a and 15b, respectively. Washers 28 are inserted between the vertical member 14 and the head of the bolt 24 and the nut 25, respectively. The spacer 21 may be an annular disk instead of the short pipe. In addition, as a material of the spacer 21, what is necessary is just to have the intensity | strength which can bear the compressive stress concerning the spacer 21 at the time of the thermal deformation of the trolley | bogie accompanying operation, and a heat-resistant temperature of 200-250 degreeC or more. Withstand enough use.

上記のように構成された炉床台車結合構造において、炉床台車間に挟まれたスペーサー２１は、図４に示すように操業時に熱変形で隣り合う台車どうしが接触しないように炉床台車の隙間を保持する。この隙間は、炉床台車の熱変形により後端縦部材１４ａｒおよび前端縦部材１４ｂｆの相対する２面の間の角度θが変化した場合、結合部の距離変化を最小にする働きを持つ。この構造により、炉床台車を結合する結合ボルト２４の伸びを最小にするため、台車相互の結合面変位のほとんどを結合ボルト２４の曲げと伸びで吸収することができ、台車の結合には僅かのガタしか生じない。この結果、個々の台車フレームは比較的自由に変形することができる。また、ナット２５により結合ボルト２４を初期に締め付け調整するだけで、予熱、冷却等の温度変化のたびに締付け量を再調整する必要はない。   In the hearth cart combination structure configured as described above, the spacer 21 sandwiched between the hearth carts is arranged so that the adjacent carts do not come into contact with each other due to thermal deformation during operation as shown in FIG. Hold the gap. This gap has a function of minimizing the distance change of the coupling portion when the angle θ between the two opposing surfaces of the rear end vertical member 14ar and the front end vertical member 14bf changes due to thermal deformation of the hearth carriage. With this structure, since the elongation of the coupling bolt 24 that couples the hearth truck is minimized, most of the coupling surface displacement between the carriages can be absorbed by the bending and elongation of the coupling bolt 24. Only play. As a result, each bogie frame can be deformed relatively freely. Further, it is not necessary to readjust the tightening amount each time the temperature changes such as preheating and cooling, only by adjusting the fastening bolt 24 with the nut 25 at the initial stage.

この結合装置２０を水平面上に複数用いることにより、結合ボルト２４の曲げおよび引張応力を結合ボルト母材の許容応力内に抑えることができる。   By using a plurality of the coupling devices 20 on the horizontal plane, the bending and tensile stress of the coupling bolt 24 can be suppressed within the allowable stress of the coupling bolt base material.

上記結合装置において、実際の隙間δ（＝スペーサーの長さ）は、次のように設定するとよい。図１および図２に示すように、炉床台車１０の上部には耐火物築造床６を介して炉床材７が載置され、該炉床材７の上部には還元用の原料（図示しない）が積載され、該原料が上から順次下に向かって加熱・焼結・還元される。この時、図５に示すように操業前（常温時）の台車１０の長手方向距離Ｗは加熱されることでその上部が長く伸びてＷ′となる。一方、当該台車の下面は、上面ほど温度が高くならない。このことから、台車１０は図のように上方に向かって凸に湾曲する。図５に示す状態は、前記両台車の伸びＷ′により、隣り合う台車の上端部が接触している状態であり、これが変形の許容限界である。   In the above coupling device, the actual gap δ (= spacer length) may be set as follows. As shown in FIGS. 1 and 2, a hearth material 7 is placed on the top of the hearth cart 10 via a refractory building floor 6, and a raw material for reduction (illustrated) is placed on the top of the hearth material 7. No) is loaded, and the raw material is heated, sintered, and reduced sequentially from the top to the bottom. At this time, as shown in FIG. 5, the longitudinal distance W of the carriage 10 before operation (at room temperature) is heated so that the upper portion of the carriage 10 is elongated and becomes W ′. On the other hand, the temperature of the lower surface of the cart is not as high as that of the upper surface. From this, the cart 10 is convexly curved upward as shown in the figure. The state shown in FIG. 5 is a state in which the upper ends of adjacent carriages are in contact with each other due to the extension W ′ of both carriages, and this is an allowable limit of deformation.

前記両台車間の端面部の傾きをスペーサー２１を中心として互いに角度θで傾いているとした時に、隣り合う台車端部の上部が接触することを防止するための前記スペーサー２１の理論上に必要な長さδは、
δ≧ｌ×ｔａｎθ ……（１）
ｌは、台車上面からスペーサー（結合ボルト）取り付け用孔までの距離である。
一方、前記と同じ状態時の、両台車端部における下部の隙間は、
Ｗ′−Ｗ＝Ｌ×ｔａｎθ ……（２）
Ｌは、台車フレームの高さである。また、同様に
α×ΔＴ×Ｗ＝Ｌ×ｔａｎθ ……（３）
ここで、αは台車フレーム主材料の線膨張係数であり、ΔＴは操業時における台車フレームの上面と下面との温度差である。前記（３）式と前記（１）式とから、
δ≧α×ΔＴ×Ｗ×l／Ｌ ……（４）
が得られる。 It is theoretically necessary for the spacer 21 to prevent the upper portions of adjacent cart ends from contacting each other when the tilt of the end surface between the carts is tilted at an angle θ around the spacer 21. The length δ is
δ ≧ l × tan θ (1)
l is the distance from the upper surface of the carriage to the spacer (coupling bolt) mounting hole.
On the other hand, in the same state as above, the lower gap at the end of both carts
W′−W = L × tan θ (2)
L is the height of the bogie frame. Similarly,
α × ΔT × W = L × tan θ (3)
Here, α is a linear expansion coefficient of the main material of the bogie frame, and ΔT is a temperature difference between the upper surface and the lower surface of the bogie frame during operation. From the equation (3) and the equation (1),
δ ≧ α × ΔT × W × l / L (4)
Is obtained.

本発明者らの実機の調査と解析結果によると、実際の操業においては台車フレームの塑性変形や水封装置の冷却効果などにより、前記傾きθは、約半分に減じられることが判明した。それにより、実際の設定にあたっては、上記δの計算結果に係数０．５を乗じた下記（５）式のスペーサー長さ（隙間）を使用するとよい。
δ≧０．５×α×ΔＴ×Ｗ×ｌ／Ｌ ……（５）
また、その上限については、両台車間上に載置する耐火物等の落下防止の点から５０ｍｍとすればよい。 According to the investigations and analysis results of the present inventors by the present inventors, it has been found that in the actual operation, the inclination θ is reduced by about half due to the plastic deformation of the carriage frame and the cooling effect of the water seal device. Accordingly, in actual setting, it is preferable to use the spacer length (gap) of the following formula (5) obtained by multiplying the calculation result of δ by a coefficient of 0.5.
δ ≧ 0.5 × α × ΔT × W × l / L (5)
The upper limit may be set to 50 mm from the viewpoint of preventing a refractory or the like placed between the two carriages from falling.

走行装置３０は、図２に示すように内周炉壁２側に車輪３２が、外周炉壁３側に車輪３３がそれぞれ台車フレーム１２の底部に取り付けられている。台車フレーム１２の下方の基礎３６上に車輪３２、３３が転動するレール３４が、炉中心周りに環状に敷設されている。   As shown in FIG. 2, the traveling device 30 has wheels 32 attached to the inner peripheral furnace wall 2 side and wheels 33 attached to the outer peripheral furnace wall 3 side at the bottom of the carriage frame 12. A rail 34 on which wheels 32 and 33 roll on a foundation 36 below the carriage frame 12 is laid in an annular shape around the furnace center.

炉床台車はスムースにレール上を走行することが求められるが、図６（ａ）に示すように、車輪３８が軸受台３７を介して基礎３６に取り付けられ、レール３９が炉床台車１０の底部に設けられた場合、熱変形によって拡大する台車間の隙間により、車輪３８とレール３９の接触に不連続部が生じてしまう。これは車輪３８およびレール３９の間に恒常的な段差による衝撃が生じることを示しており、長期的にはそれぞれが疲労破壊することとなる。これを回避するために、本発明では図６（ｂ）に示すように車輪３２、３３は炉床台車１０の底部に設けている。   Although the hearth truck is required to smoothly travel on the rail, as shown in FIG. 6A, the wheel 38 is attached to the foundation 36 via the bearing base 37, and the rail 39 is connected to the hearth truck 10. When provided at the bottom, a discontinuity occurs in the contact between the wheel 38 and the rail 39 due to the gap between the carriages that expands due to thermal deformation. This indicates that an impact due to a constant step is generated between the wheel 38 and the rail 39, and in the long term, each of them will undergo fatigue failure. In order to avoid this, in the present invention, the wheels 32 and 33 are provided at the bottom of the hearth carriage 10 as shown in FIG.

また、各炉床台車１０において、図７に示すように車輪３２、３３は外周炉壁側に２個、内周炉壁側に１個、またはこの逆にそれぞれ配置されている。このように車輪３２、３３を配置することで、すべての車輪は常時、確実にレール３４と接触する。この結果、炉床台車１０は車輪３２、３３により安定して支持され、走行がスムースとなるので、炉床台車１０、車輪３２、３３およびレール３４が疲労破壊することはない。   Further, in each hearth cart 10, as shown in FIG. 7, two wheels 32 and 33 are arranged on the outer peripheral furnace wall side, one on the inner peripheral furnace wall side, or vice versa. By arranging the wheels 32 and 33 in this way, all the wheels are always in contact with the rail 34 reliably. As a result, the hearth cart 10 is stably supported by the wheels 32 and 33, and the running is smooth, so that the hearth cart 10, the wheels 32 and 33 and the rail 34 are not fatigued.

図８は、台車上面鉄板支持金物４０の一例を示している。台車上面鉄板支持金物４０は、細長の板からなり、その複数が板面を鉛直にして炉床台車１０の上面に固定されている。台車上面鉄板支持金物４０は炉床台車１０の長手方向（円周方向）に沿い台車全長にわたって延びており、隣り合う台車上面鉄板支持金物４０との間に適正な膨張代４９が設けられている。台車上面鉄板支持金物４０の高さは２５〜１５０ｍｍ、幅は９〜３２ｍｍ程度である。台車上面鉄板８が台車上面鉄板支持金物４０の上面４１に載っており、台車上面鉄板８は台車上面鉄板支持金物４０に対し変位可能である。また、炉床台車１０の上面に保持ボルト４５が固定されている。保持ボルト径より大きい複数のボルト孔（図示しない）が台車上面鉄板８に設けられており、このボルト孔を保持ボルト４５の上端部が貫通している。保持ボルト４５の上端部にナット４６がはめ合っており、台車上面鉄板８とナット４６との間に座金４８が挿入されている。台車上面鉄板８と台車上面鉄板支持金物４０とが相互に変位可能なように、ナット４６は緩く締められている。台車上面鉄板８の上面から突出する保持ボルト４５の上端部とナット４６とが入り込む空間が、耐火物築造床６の炉床耐火物の底部（図示しない）に設けられている。耐火物床支持金物４０は、材質においては２００〜２５０℃以上の耐熱温度を有し、機械的性質に優れたものが適しており、一般的には鋼鉄製のものが望ましい。   FIG. 8 shows an example of the carriage top surface iron plate support hardware 40. The carriage upper surface iron plate support metal 40 is formed of an elongated plate, and a plurality of the upper plate iron plate support metal 40 are fixed to the upper surface of the hearth carriage 10 with the plate surface vertical. The carriage upper surface iron plate support hardware 40 extends over the entire length of the carriage along the longitudinal direction (circumferential direction) of the hearth carriage 10, and an appropriate expansion allowance 49 is provided between adjacent carriage upper surface iron plate support hardware 40. . The height of the carriage top surface iron plate support metal 40 is about 25 to 150 mm, and the width is about 9 to 32 mm. The carriage upper surface iron plate 8 is placed on the upper surface 41 of the carriage upper surface iron plate support metal 40, and the carriage upper surface iron plate 8 can be displaced with respect to the carriage upper surface iron plate support metal 40. A holding bolt 45 is fixed to the upper surface of the hearth cart 10. A plurality of bolt holes (not shown) larger than the holding bolt diameter are provided in the carriage upper surface iron plate 8, and the upper end portion of the holding bolt 45 passes through the bolt holes. A nut 46 is fitted to the upper end portion of the holding bolt 45, and a washer 48 is inserted between the carriage upper surface iron plate 8 and the nut 46. The nut 46 is loosely tightened so that the cart upper surface iron plate 8 and the cart upper surface iron plate support metal 40 can be displaced from each other. A space in which the upper end of the holding bolt 45 protruding from the upper surface of the carriage upper surface iron plate 8 and the nut 46 enters is provided in the bottom (not shown) of the hearth refractory of the refractory building floor 6. The refractory floor support metal 40 has a heat resistant temperature of 200 to 250 ° C. or higher and is excellent in mechanical properties, and is generally made of steel.

上記のように構成された台車上面鉄板支持金物４０を有する炉床台車１０では、炉床台車１０が熱変形を生じた場合、台車上面鉄板８と台車上面鉄板支持金物４０とが相互に変位するので、その熱変形が耐火物築造床６や台車上面鉄板８に変形や外力を及ぼすことはなく、耐火物築造床６上の炉床耐火物の破損を回避することができる。また、保持ボルト４５は、台車上面鉄板８と台車フレーム１２の変位を規制し、両者間の大きなずれを防ぐ。   In the hearth carriage 10 having the carriage top surface iron plate support hardware 40 configured as described above, when the hearth carriage 10 is thermally deformed, the carriage top surface iron plate 8 and the carriage top surface iron plate support hardware 40 are displaced from each other. Therefore, the thermal deformation does not exert deformation or external force on the refractory building floor 6 or the carriage upper surface iron plate 8, and damage to the hearth refractory on the refractory building floor 6 can be avoided. In addition, the holding bolt 45 regulates the displacement of the carriage upper surface iron plate 8 and the carriage frame 12 and prevents a large shift between them.

図９は、台車上面鉄板支持金物の他の例を示している。台車上面鉄板支持金物４２は、短い円柱または角柱からなり、炉床台車１０の上面に鉛直に取り付けられている。台車上面鉄板支持金物４２の複数が、炉床台車１０の長手方向に沿い台車全長にわたって配置されており、高さは１０〜１２５ｍｍ、直径（角形）は５０〜１００ｍｍ程度である。台車上面鉄板８が台車上面鉄板支持金物４２の上面４３に載っており、台車上面鉄板８および台車上面鉄板支持金物４２は相互に変位可能である。保持ボルト４５の構成および台車上面鉄板支持金物４２の作用は、図８に示すものと同じである。   FIG. 9 shows another example of the carriage top surface iron plate support hardware. The carriage upper surface iron plate support metal 42 is formed of a short cylinder or a prism, and is vertically attached to the upper surface of the hearth carriage 10. A plurality of bogie upper surface iron plate support hardwares 42 are disposed over the entire length of the bogie along the longitudinal direction of the hearth bogie 10 and have a height of 10 to 125 mm and a diameter (square) of about 50 to 100 mm. The cart upper surface iron plate 8 is placed on the upper surface 43 of the cart upper surface iron plate support metal 42, and the cart upper surface iron plate 8 and the cart upper surface iron plate support metal 42 can be displaced from each other. The structure of the holding bolt 45 and the operation of the carriage upper surface iron plate support metal 42 are the same as those shown in FIG.

炉床台車１０と炉壁２、３との間に、炉心を中心とする環状の水封装置９が設けられている。水封装置９は、高温の炉内ガスが炉外へ漏出したり、または大気が炉外から炉内へ侵入したりして、炉内の還元雰囲気を損なうことを防ぐ。   Between the hearth carriage 10 and the furnace walls 2 and 3, an annular water seal device 9 centering on the core is provided. The water seal device 9 prevents high-temperature furnace gas from leaking out of the furnace or air from entering the furnace from outside the furnace to impair the reducing atmosphere in the furnace.

本発明の炉床台車の構造を模式的に示す斜視図である。It is a perspective view which shows typically the structure of the hearth cart of this invention. 前記炉床台車の正面図である。It is a front view of the hearth trolley. 前記炉床台車の結合部の詳細図である。It is detail drawing of the coupling | bond part of the said hearth cart. 本発明の炉床台車の結合部の作用説明図である。It is operation | movement explanatory drawing of the coupling | bond part of the hearth cart of this invention. 本発明のスペーサーの長さと、炉床台車の寸法、台車上下部間の温度差、スペーサー位置などとの関係を説明する図面である。It is drawing which demonstrates the relationship between the length of the spacer of this invention, the dimension of a hearth trolley | bogie, the temperature difference between trolley | bogie upper and lower parts, a spacer position, etc. FIG. 車輪の取付け位置による走行装置の作用の相違を説明する模式図である。It is a schematic diagram explaining the difference in the effect | action of the traveling apparatus by the attachment position of a wheel. 本発明の炉床台車の熱変形を説明する図である。It is a figure explaining the thermal deformation of the hearth trolley | bogie of this invention. 本発明の台車上面鉄板支持金物の一例を模式的に示す斜視図である。It is a perspective view which shows typically an example of the trolley | bogie upper surface iron plate support metal fittings of this invention. 本発明の台車上面鉄板支持金物の他の例を模式的に示す斜視図である。It is a perspective view which shows typically the other example of the trolley | bogie upper surface iron plate support metal fittings of this invention. 従来の炉床台車の結合構造の例を示す図面である。It is drawing which shows the example of the connection structure of the conventional hearth trolley | bogie. 従来の炉床台車の結合構造の他の例を示す図面である。It is drawing which shows the other example of the connection structure of the conventional hearth trolley | bogie. 従来の炉床台車の熱変形を説明する図面である。It is drawing explaining the thermal deformation of the conventional hearth cart. 従来の炉床台車において、内周側車輪浮き上がりによる炉床耐火物と炉壁耐火物との干渉を説明する模式図である。In the conventional hearth carriage, it is a schematic diagram explaining the interference with the hearth refractory and the furnace wall refractory due to the inner peripheral side wheel lifting.

符号の説明Explanation of symbols

１ 回転炉床炉 ２、３ 炉壁
５ 炉床 ６ 耐火物築造床
７ 炉床材 ８ 台車上面鉄板
９ 水封装置 １０ 炉床台車
１２ 台車フレーム １４ 台車フレームの縦部材
２０ 結合装置 ２１ スペーサー
２２ スペーサーの軸孔 ２４ 結合ボルト
２５、２６ 結合ボルトのナット ２８ 座金
２９ ボルト孔 ３０ 走行装置
３２、３３ 車輪 ３４ レール
４０、４２ 台車上面鉄板支持金物 ４５ 保持ボルト
４６ 保持ボルトのナット ４８ 座金
４９ 膨張代 ５０ 溶接構造
５２ 多段ボルト締結構造
δ 台車間隙間 DESCRIPTION OF SYMBOLS 1 Rotating hearth furnace 2, 3 Furnace wall 5 Hearth 6 Refractory building floor 7 Hearth material 8 Bogie top iron plate 9 Water seal device 10 Hearth bogie 12 Bogie frame 14 Bogie frame vertical member 20 Coupling device 21 Spacer 22 Spacer Shaft hole 24 coupling bolt 25, 26 coupling bolt nut 28 washer 29 bolt hole 30 travel device 32, 33 wheel 34 rail 40, 42 bogie upper surface iron plate support metal 45 retaining bolt 46 retaining bolt nut 48 washer 49 expansion allowance 50 welding Structure 52 Multi-stage bolt fastening structure δ Clearance between trucks

Claims (4)

炉床を載置している炉床台車がそれぞれ走行装置を有する複数の炉床台車からなり、隣り合う前記炉床台車の結合を、ボルト・ナットをスペーサーを介して水平面上で１列に間隔をおいて結合する構造としたことを特徴とする回転炉床炉の炉床台車結合構造。   The hearth cart on which the hearth is mounted is composed of a plurality of hearth carts each having a traveling device, and the adjacent hearth carts are connected in a row on the horizontal plane by bolts and nuts through spacers. A hearth cart combination structure of a rotary hearth furnace characterized by having a structure in which the two are connected with each other. 前記スペーサーの長さδを下記式で導き出す長さとしたことを特徴とする請求項１記載の回転炉床炉の炉床台車結合構造。
δ≧０．５×α×ΔＴ×Ｗ×ｌ／Ｌ
α ： 台車フレーム主材料の線膨張係数
ΔＴ： 操業時における台車フレームの上面と下面との温度差
Ｗ ： 台車の長さ
ｌ ： 台車上面からスペーサー（結合ボルト）取り付け用孔までの距離
Ｌ ： 台車フレームの高さ 2. The hearth cart combination structure of a rotary hearth furnace according to claim 1, wherein the length δ of the spacer is derived from the following formula.
δ ≧ 0.5 × α × ΔT × W × l / L
α: Linear expansion coefficient of the main material of the bogie frame ΔT: Temperature difference between the upper and lower surfaces of the bogie frame during operation W: Length of the bogie l: Distance from the upper surface of the bogie to the spacer (coupling bolt) mounting hole L: Bogie Frame height 前記炉床台車の移動用車輪は、当該炉床台車の下部に設けられており、各炉床台車において外周炉壁側に２個、内周炉壁側に１個またはこの逆に配置されていることを特徴とする請求項１または請求項２記載の回転炉床炉の炉床台車結合構造。   The moving wheels of the hearth cart are provided at the lower part of the hearth cart, and are arranged on the outer hearth wall side on each of the hearth carts, one on the inner hearth wall side or vice versa. 3. A hearth bogie coupling structure for a rotary hearth furnace according to claim 1 or 2, wherein 炉床の耐火物築造床と炉床台車とを別個に設け、互いに変位可能に結合したことを特徴とする請求項１、２または３記載の回転炉床炉の炉床台車結合構造。   The refractory building floor of the hearth and the hearth carriage are separately provided and coupled to each other so as to be displaceable with each other.
JP2006103171A 2005-04-08 2006-04-04 Rotary hearth furnace Active JP4312774B2 (en)

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JP2006103171A JP4312774B2 (en) 2005-04-08 2006-04-04 Rotary hearth furnace
PCT/JP2006/318889 WO2007113929A1 (en) 2006-04-04 2006-09-19 Hearth carriage connection structure for rotary hearth furnace
CN2006800545647A CN101438117B (en) 2006-04-04 2006-09-19 Hearth carriage connection structure of rotary hearth furnace
US12/226,033 US8021602B2 (en) 2006-04-04 2006-09-19 Hearth carriage coupling structure of rotary furnace hearth
EP06798273A EP2006625B1 (en) 2006-04-04 2006-09-19 Hearth carriage connection structure for rotary furnace hearth
KR1020087024307A KR101073115B1 (en) 2006-04-04 2006-09-19 Hearth carriage connection structure for rotary hearth furnace

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103542720A (en) * 2013-08-28 2014-01-29 江苏高皓工业炉有限公司 Double-head pallet car furnace
CN103643026A (en) * 2013-12-26 2014-03-19 四川德胜集团钒钛有限公司 Steel feeding platform of steel-pushing-type heating furnace
CN103836973A (en) * 2012-12-04 2014-06-04 洛阳力合机械有限公司 Plate type steel structure trolley body

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103836973A (en) * 2012-12-04 2014-06-04 洛阳力合机械有限公司 Plate type steel structure trolley body
CN103542720A (en) * 2013-08-28 2014-01-29 江苏高皓工业炉有限公司 Double-head pallet car furnace
CN103542720B (en) * 2013-08-28 2015-04-22 江苏高皓工业炉有限公司 Double-head pallet car furnace
CN103643026A (en) * 2013-12-26 2014-03-19 四川德胜集团钒钛有限公司 Steel feeding platform of steel-pushing-type heating furnace

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