JP2008133165A

JP2008133165A - Support structure for hearth bed

Info

Publication number: JP2008133165A
Application number: JP2006322143A
Authority: JP
Inventors: Kenji Ujiie; 謙二氏家; Tomoki Matsuba; 知樹松葉
Original assignee: Central Glass Co Ltd
Current assignee: Central Glass Co Ltd
Priority date: 2006-11-29
Filing date: 2006-11-29
Publication date: 2008-06-12
Anticipated expiration: 2026-11-29
Also published as: JP4770720B2

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with re-adjustment, even in a hot condition, for each height of upper surfaces of respective hearth beds having been adjusted in a cold condition so as not to form step differences. <P>SOLUTION: The support structure of hearth beds juxtaposed to each other in a heating furnace for conveying glass sheets in a floating state comprises supporting frames to be fitted by supporting blocks and under surfaces thereof horizontally disposed in parallel with the conveyance direction of the glass sheets in two sides opposing each other in the bottom surface of the hearth bed, supporting rods penetrating the supporting blocks and the supporting frames at four corners of the hearth beds and inserted into upper fitting holes of engaging implements located down below, and struts erected from a retaining stand and their upper end parts are inserted into lower fitting holes of the engaging implements. The supporting rod, the supporting block and the strut are made of ceramic refractory of a low expansion nature. The supporting rod and the strut are clothed in a rigid tubular protecting tube and a rigid strut-protecting tube, respectively, in the hot condition, the upper end of each of the supporting rod and the strut is protruded from the upper end of each of the tubular protecting tube and the strut-protecting tube, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、熱風ガスにより浮上させて支持される板ガラスを、加熱炉内で並設したハースベッド上を移送することにより曲げ成形するガス炉のハースベッドの支持構造に関する。 The present invention relates to a support structure for a hearth bed of a gas furnace in which plate glass floated and supported by hot air gas is bent by being transferred on a hearth bed arranged in parallel in a heating furnace.

従来、自動車用の窓ガラスなどに使用される湾曲ガラス板は、型枠上に載置された板ガラスを加熱軟化し、自重により垂下させて曲げる自重曲げ方式や、曲げ型を使用して加熱された板ガラスを両面からプレス曲げするプレス曲げ方式、ハースベッドから噴出される高温ガスにより、ガラス板を浮揚移動させながら曲げるガスハース曲げ方式、板ガラスを搬送ロールによって搬送しながら搬送ロールの形状に倣って曲げるローラハース曲げ方式など、湾曲ガラス板の大きさ、形状によって適宜効率の良い方法がとられ、使い分けられている。 Conventionally, curved glass plates used for window glass for automobiles are heated using a self-weight bending method in which a plate glass placed on a mold is softened by heating and bent by its own weight, or by using a bending die. Press bending method to bend glass plate from both sides, gas hearth bending method to bend the glass plate by levitating and moving by high-temperature gas ejected from the hearth bed, and bend the plate glass according to the shape of the transport roll while transporting it by the transport roll Depending on the size and shape of the curved glass plate, such as a roller hearth bending method, an efficient method is taken as appropriate.

これらのガラス板の曲げ加熱方式のうち、ガスハース曲げ炉と呼ばれる方式は、耐火製のハースベッドの上面に無数の小孔を設け、該小孔より圧縮エアまたはガスを噴出させることによってガラス板を浮上させながら搬送させるものであるが、安定した姿勢で搬送させる為に、ガラス板の搬送方向に直交するハースベッドの片側方向に僅かに傾斜させて、浮上するガラス板を傾斜面の下方側に移動させ、ガラス板の下端辺の複数箇所及び搬送方向の上流側辺にガラス板の形状に合わせて支承具を当接させることによって浮上するガラス板の姿勢を一定に維持して搬送しながら、加熱炉内で曲げ加工する方式である。 Among these glass plate bending heating methods, a method called a gas hearth bending furnace is provided with innumerable small holes on the upper surface of a fireproof hearth bed, and compressed air or gas is ejected from the small holes. In order to carry it while floating, in order to carry it in a stable posture, it is slightly inclined in one direction of the hearth bed perpendicular to the conveying direction of the glass plate, and the floating glass plate is placed below the inclined surface. While moving and maintaining the posture of the glass plate that floats by contacting the support tool in accordance with the shape of the glass plate at the plurality of locations on the lower end side of the glass plate and the upstream side in the transport direction, This is a method of bending in a heating furnace.

前記従来の支持構造はハースベッドの長さ方向にわたりその底部両側に横設した耐火物からなる支持ブロック、および該支持ブロックの下面を被嵌する耐熱性の金属たとえばステンレス鋼よりなる支持枠と、ハースベッドの四隅部において該支持枠を担持し保持台より立設した金属の支柱よりなり、保持台には昇降調整手段を設けたものが知られている。 The conventional support structure is a support block made of a refractory material provided laterally on both sides of the bottom of the hearth bed in the length direction, and a support frame made of a heat-resistant metal such as stainless steel covering the lower surface of the support block; 2. Description of the Related Art There are known metal support columns that support the support frames at four corners of a hearth bed and are erected from a holding table.

例えば、本出願人による出願による実公平２−１３４５３号公報には、ガス炉のハースベッドの長さ方向にわたりその底部両側に横設した支持ブロックおよび該支持ブロックの支持枠と、ハースベッドの四隅部において前記支持ブロックおよび支持枠に貫挿しかつ下方に位置した係止具の上部嵌合孔に挿入したサポートロッドと、前記係止具下部嵌合孔に上端部を挿入し保持台より立設した支柱よりなり、前記支持ブロック、サポートロッド、支柱は低膨張性耐火物よりなることを特徴とするハースベッドの支持構造が開示されている（特許文献１）。
実公平２−１３４５３号公報 For example, in Japanese Utility Model Publication No. 2-13453 filed by the present applicant, there is a support block horizontally provided on both sides of the bottom of the hearth bed of the gas furnace, a support frame of the support block, and four corners of the hearth bed. The support rod inserted into the support block and the support frame at the upper part and inserted into the upper fitting hole of the locking tool positioned below, and the upper end portion of the locking tool lower fitting hole is inserted into the holding tool and erected from the holding base. There is disclosed a support structure for a hearth bed, characterized in that the support block, the support rod, and the support are made of a low-expansion refractory (Patent Document 1).
Japanese Utility Model Publication No. 2-3453

ガスハース炉においては、ハースベッドの上面に設けた小穴より熱風ガスを噴出させて、板ガラスを浮上させて被接触で、該板ガラスの上面形状に倣うようにガラス板を正確に湾曲させるので、板ガラス面にキズを付けないようにして湾曲成形させることができる反面、該ガラス板の下面とハースベッドの上面との間隔、すなわちガラス板の浮上量がガラス板の形状によっても異なるが、概ね０．５〜１ｍｍ程度となり、特に複数個並設したハースベッドの後半においてはガラス板の湾曲形状をハースベッドの湾曲形状に合わせるために前記浮上量を少なく設定している。このため、並設したハースベッドの上面相互の段差を前記間隔より小さくし、好ましくは０．２〜０．５ｍｍ以下としないと、該段差部分でガラス面に接触してキズが発生してしまうことになる。 In the gas hearth furnace, hot glass gas is blown out from a small hole provided on the upper surface of the hearth bed, and the glass plate is floated to be brought into contact, and the glass plate is accurately curved so as to follow the shape of the upper surface of the glass plate. Although it can be curved and formed without scratching, the distance between the lower surface of the glass plate and the upper surface of the hearth bed, that is, the flying height of the glass plate varies depending on the shape of the glass plate, but is generally 0.5. In the latter half of a plurality of hearth beds arranged side by side, the flying height is set small in order to match the curved shape of the glass plate to the curved shape of the hearth bed. For this reason, unless the step between the upper surfaces of the arranged hearth beds is made smaller than the above-mentioned distance, and preferably 0.2 to 0.5 mm or less, the stepped portion contacts the glass surface and scratches are generated. It will be.

従来の耐熱金属製の支柱を用いたものは、線膨張係数が大のため、ガス炉の稼動前に
冷間で支柱に設けた高さ調整手段により並設する各ハースベッドの上面同士の高さを揃えても、ガス炉の加熱後に炉内温度分布に起因して場所毎に上記部材の膨張代に差が生じてハースベッドの上面に段差をもたらすだけでなく、熱間で再度綿密に昇降調整しなければならないため、非常に手間と時間を要するという問題があった。 Since the conventional heat-resistant metal column has a large linear expansion coefficient, the height of the upper surfaces of the hearth beds arranged in parallel by the height adjusting means provided in the column in the cold before the operation of the gas furnace is high. Even if it is evenly arranged, not only does the expansion allowance of the above-mentioned member differ from place to place due to the temperature distribution in the furnace after heating the gas furnace, resulting in a step on the upper surface of the hearth bed, There is a problem that much time and effort are required because the elevation adjustment must be performed.

これらの問題点を改善した前記特許文献１に記載の発明は、図６にも示したように、支柱を低膨張の溶融シリカ製の支柱とし、その周囲を支柱の長さより長さの短いステンレス鋼の保護管で囲って補強して膨張を抑えたものであるが、支柱が脆性の溶融シリカであるため大変脆く、また保護管の内部と支柱間に隙間が小さいので、熱歪等により保護管が曲がり、溶融シリカの支柱がこの変形に追従できず、割れてしまうというという問題点があり、また、保護管の熱膨張に引っ張られて高さ方向に変動してしまうという問題点があった。 As shown in FIG. 6, the invention described in Patent Document 1 that has improved these problems has a support column made of low-expansion fused silica, and its periphery is a stainless steel whose length is shorter than the length of the support column. It is surrounded by a steel protective tube and reinforced to suppress expansion, but it is very brittle because the struts are brittle fused silica, and the gap between the inside of the protective tube and the struts is small, so it is protected by thermal strain etc. There is a problem that the tube is bent, and the fused silica column cannot follow this deformation and breaks, and it is pulled by the thermal expansion of the protective tube and fluctuates in the height direction. It was.

さらに、特許文献１のハースベッドと当接する支持ロッドは耐熱金属製であるために炉内の加熱による熱膨張によってハースベッドの上面の高さ間に段差が発生し易いという問題点があった。 Further, since the support rod that contacts the hearth bed of Patent Document 1 is made of a heat-resistant metal, there is a problem that a step is easily generated between the heights of the upper surface of the hearth bed due to thermal expansion by heating in the furnace.

本発明は、このような問題点に鑑みてなされたものであり、加熱炉内のハースベッドを支持する支柱及び支持ロッドが脆性材料であっても、破損することなく、冷間で高さ調整手段により調節した各ハースベッドの上面同士の高さが、加熱後でも再調整不要で段差を発生させることなく一定とし、ガラス板を複数のハースベッド上でスムーズに搬送できることを目的とする。 The present invention has been made in view of such problems, and even when the support rod and the support rod that support the hearth bed in the heating furnace are brittle materials, the height is adjusted cold without being damaged. An object of the present invention is to make the height of the upper surfaces of the respective hearth beds adjusted by the means constant even after heating without causing readjustment without causing a step, and to smoothly convey a glass plate on a plurality of hearth beds.

すなわち、本発明は、ガラス板を浮上させながら搬送する加熱炉内に並設したハースベッドの支持構造において、
ガス炉のハースベッドの底面部の対向する２辺で、かつガラス板の搬送方向に平行に横設した支持ブロックおよび該支持ブロックの下面を被嵌する支持枠と、
ハースベッドの四隅部において前記支持ブロックおよび支持枠に貫挿しかつ下方に位置した係止具の上部嵌合孔に挿入した支持ロッドと、
前記係止具の下部嵌合孔に上端部を挿入し保持台より立設した支柱からなり、
前記支持ロッド、支持ブロック、支柱を低膨張性のセラミック耐火物として、前記支持ロッドおよび支柱の周囲に、それぞれ剛性で耐熱材料の筒状保護管、および支柱保護管を被着させ、かつ、操業時の熱間において、支持ロッド、および支柱のそれぞれの上端が筒状保護管、および支柱保護管の上端より上方に突出するようにしたことを特徴とするハースベッドの支持構造である。 That is, the present invention, in the support structure of the hearth bed arranged in parallel in the heating furnace that conveys while floating the glass plate,
A support block horizontally provided parallel to the conveying direction of the glass plate on two opposite sides of the bottom portion of the hearth bed of the gas furnace, and a support frame for fitting the lower surface of the support block;
A support rod that is inserted into the support block and the support frame at the four corners of the hearth bed and is inserted into the upper fitting hole of the latch located below;
The upper end is inserted into the lower fitting hole of the locking tool and consists of a support column erected from the holding stand.
The support rod, support block, and column are made of ceramic refractory with low expansion, and a cylindrical protective tube and a column protective tube made of a rigid and heat-resistant material are attached around the support rod and the column, respectively. This is a hearth bed support structure characterized in that the upper ends of the support rod and the support column protrude upward from the upper ends of the cylindrical protection tube and the support column protection tube during the time.

あるいは、本発明は、前記支柱を少なくとも３つに分割したことを特徴とする上述のハースベッドの支持構造である。 Alternatively, the present invention is the above-described hearth bed support structure, wherein the support column is divided into at least three.

あるいは、本発明は、前記分割した支柱の外径と、支柱保護管の内径間に隙間を設けるようにしたことを特徴とする上述のハースベッドの支持構造である。 Alternatively, the present invention is the above-described hearth bed support structure in which a gap is provided between the outer diameter of the divided struts and the inner diameter of the strut protection tube.

本発明のハースベッドの支持構造によれば、加熱炉内の熱による支持構造の膨張は低膨張性耐火物である支持ロッドおよび支柱の膨張により支配されるが、それらは膨張係数１０^−７／℃程度またはそれ以下ときわめて小さく、６００℃以上に加熱しても無視しうる程度の膨張代であるので冷間で高さ調整手段により調節した各ハースベッドの上面の各高さが熱間においても再調整不要で段差を発生させることなく一定となり、浮上するガラス板を複数のハースベッド間に跨ってスムーズに搬送できる。 According to the support structure of the hearth bed of the present invention, the expansion of the support structure due to the heat in the heating furnace is governed by the expansion of the support rod and the support column, which are low-expansion refractories, and they have an expansion coefficient of 10 ⁻⁷ / Since the expansion allowance is so small that it is negligible even when heated to 600 ° C or higher, each height of the upper surface of each hearth bed adjusted by the height adjusting means is hot. However, no re-adjustment is required, and there is no step difference, and the rising glass plate can be smoothly transported across a plurality of hearth beds.

本発明のハースベッドの支持構造は、ガス炉のハースベッド１の底面部の対向する２辺、かつガラス板の搬送方向に平行に横設した支持ブロック４および該支持ブロック４の下面を被嵌する支持枠５と、ハースベッド１の四隅部において前記支持ブロック４および支持枠５に貫挿しかつ下方に位置した係止具６の上部嵌合孔に挿入した支持ロッド２と、前記係止具６の下部嵌合孔に上端部を挿入し保持台より立設した支柱７からなり、
前記支持ロッド２、支持ブロック４、支柱７の材質を低膨張性のセラミック耐火物製として、前記支持ロッド２および支柱７の周囲に、それぞれ剛性の筒状保護管３、および支柱保護管８を被着させ、熱間において、支持ロッド２、および支柱７のそれぞれの上端が筒状保護管３、および支柱保護管８の上端より上方に突出させるようにしたものであり、その突出する長さを、１〜３ｍｍとするのが好ましい。 The support structure of the hearth bed of the present invention includes a support block 4 that is disposed in parallel to the opposite sides of the bottom surface of the hearth bed 1 of the gas furnace and parallel to the conveying direction of the glass plate, and the lower surface of the support block 4 is fitted. A support frame 5 that is inserted into the support block 4 and the support frame 5 at the four corners of the hearth bed 1 and inserted into an upper fitting hole of a lock tool 6 positioned below, and the lock tool 6 is composed of a support column 7 that is inserted into the lower fitting hole 6 and is erected from a holding stand.
The support rod 2, the support block 4, and the support column 7 are made of a low expansibility ceramic refractory, and a rigid cylindrical protection tube 3 and a support column protection tube 8 are provided around the support rod 2 and the support column 7, respectively. The upper ends of the support rod 2 and the support column 7 protrude above the upper ends of the cylindrical protection tube 3 and the support column protection tube 8 in the hot state. Is preferably 1 to 3 mm.

また、支柱保護管８内に配設した前記支柱７は、上下方向に少なくとも３分割し、上下方向に直列に配設するのが好ましく、円柱状の低膨張性のセラミック耐火物製とし、その周囲に支柱保護管８を被着させた。該支柱保護管８の最下端部は閉状態で密閉されているので支柱７が下方に落下することはない。 Further, the column 7 disposed in the column protection tube 8 is preferably divided into at least three parts in the vertical direction and arranged in series in the vertical direction, and is made of a columnar low expansion ceramic refractory, A column protection tube 8 was attached to the periphery. Since the lowermost end of the column protection tube 8 is closed and sealed, the column 7 does not fall downward.

さらに、前記支柱７を分割した場合には、支柱７の外径と、剛性の支柱保護管８の内径間には２ｍｍ前後の隙間を設けるのが好ましい。 Further, when the support column 7 is divided, it is preferable to provide a gap of about 2 mm between the outer diameter of the support column 7 and the inner diameter of the rigid support column protecting tube 8.

前記支持ブロック４は、ハースベッド１の底部両側でトンネル状の炉壁と平行な方向に伸ばした断面が矩形状のフレーム状部材であり、その長さはハースベッド１の底部の側辺の長さに略一致させるのが良く、その材質は、溶融シリカ製等の低膨張のセラミック耐火物とし、その線膨張率係数は０．５４ｘ１０^−６である。 The support block 4 is a frame-shaped member having a rectangular cross section extending in a direction parallel to the tunnel-shaped furnace wall on both sides of the bottom of the hearth bed 1, and the length thereof is the length of the side of the bottom of the hearth bed 1. The material is preferably a low-expansion ceramic refractory such as fused silica, and its coefficient of linear expansion is 0.54 × 10 ⁻⁶ .

また、前記支持ブロック４の下部には、支持ブロック４を保持する断面略コ字状の剛性の耐熱性金属からなる支持枠５を被嵌し、前記支持ブロック４、および支持枠５の両部材に設けられた穿孔部内を筒状保護管で被嵌された支持ロッド２を挿通させ、支持枠５の下面に当接するように配設した係止具６によって支持される。 Further, a support frame 5 made of a heat-resistant metal having a substantially U-shaped cross section for holding the support block 4 is fitted to the lower portion of the support block 4, and both the support block 4 and the support frame 5 are both members. A support rod 2 fitted with a cylindrical protective tube is inserted through the perforated portion provided in the support hole 5 and is supported by a locking tool 6 disposed so as to contact the lower surface of the support frame 5.

尚、支持枠５は、金属製であり低膨張性耐火物からなる支持ブロックより熱間においては膨張するため、冷間においては支持枠５の長手方向の長さを、支持ブロック４の長手方向の長さより熱膨張分だけ短くした。 The support frame 5 is made of metal and expands hotter than the support block made of a low-expansion refractory. Therefore, the length of the support frame 5 in the longitudinal direction is set to the length of the support block 4 in the cold state. The thermal expansion was made shorter than the length of.

前記係止具６は、剛性の耐熱性金属からなるブロック形状であり、上面側に前記筒状保護管３の外径と一致する内径の上部嵌合孔、下面側には前記支柱保護管８の外径と一致する下部嵌合孔を有しており、上部嵌合孔と下部嵌合孔の中心軸を一致するように設けた。 The locking tool 6 has a block shape made of a rigid heat-resistant metal, has an upper fitting hole having an inner diameter that matches the outer diameter of the cylindrical protective tube 3 on the upper surface side, and the support column protective tube 8 on the lower surface side. A lower fitting hole that matches the outer diameter of the upper fitting hole and the center axis of the upper fitting hole and the lower fitting hole are provided to coincide with each other.

前記ハースベッド１は周知の低膨張性耐火物が用いられているが、支持ブロック４も低膨張性耐火物を用いることにより熱によるハースベッド１と支持ブロック４との長さ方向、すなわち加熱炉の壁面に平行な方向の膨張差が生じず、したがつて直列に並設したハースベッド１、１、・・間に隙間が生ずることがなく、勿論ハースベッドの長さと同一に設定した支持ブロック４、４間にも隙間が生じない。 The hearth bed 1 uses a known low-expansion refractory, but the support block 4 also uses a low-expansion refractory, so that the length direction of the hearth bed 1 and the support block 4 by heat, that is, a heating furnace is used. No difference in expansion in the direction parallel to the wall of the wall, and therefore no gap between the hearth beds 1, 1,. There is no gap between 4 and 4.

後述するように、係止具６の上部嵌合孔の下端面と下部嵌合孔の上端面間を仕切る隔壁の厚みを薄くすれば、金属製である係止具６の熱による膨張を考慮しても２０ｍｍ以下とするのが好ましいが、実用上５〜１０ｍｍ程度であれば充分である。このように、その影響は微小であるので、全体としての膨張代は僅少となり、並設するハースベッド１、１、・・に操業上支障となるような段差が生じることはない。 As will be described later, if the thickness of the partition wall that partitions the lower end surface of the upper fitting hole and the upper fitting surface of the lower fitting hole is reduced, the expansion of the metal locking device 6 due to heat is taken into consideration. Even if it is preferable to set it to 20 mm or less, if it is about 5-10 mm practically, it is enough. In this way, since the influence is minute, the expansion allowance as a whole is small, and there is no level difference that hinders operation in the hearth beds 1, 1,.

支持ブロック４、支持ロッド２、支柱７は、線膨張係数０．５４Ｘ１０^−６／℃程度、もしくはそれ以下の低膨張性耐火物が用いられ、適応する耐火物としては工業的に大量生産かつ入手が容易な高純度の溶融シリカブロックが推挙できる。 For the support block 4, the support rod 2, and the support column 7, a low expansion refractory having a coefficient of linear expansion of about 0.54 × 10 ⁻⁶ / ° C. or lower is used. It is possible to recommend a high-purity fused silica block that is easy to handle.

支持ブロック４を支持する支持枠５、および係止具６は剛性の金属材料より任意に選択しうるが、強度や耐熱性に優れており、かつ入手容易な材料であるステンレス鋼を用いるのが通例である。 The support frame 5 that supports the support block 4 and the locking member 6 can be arbitrarily selected from rigid metal materials, but stainless steel, which is excellent in strength and heat resistance and is easily available, is used. It is customary.

低膨張性耐火物からなる前記支柱７を保護する金属製の支柱保護管８は支持金具１２によって架台２３に支持され、該支柱保護管８の下端部は、加熱炉の炉床より下方位置にあり、また、支柱保護管８の下端には高さ調整部材１１を設け、該高さ調整部材１１によって支柱保護管８及び支柱７の高さを調整自在である。 A metal support tube 8 that protects the support column 7 made of a low-expansion refractory is supported on a pedestal 23 by a support fitting 12, and the lower end portion of the support column protection tube 8 is positioned below the hearth of the heating furnace. In addition, a height adjustment member 11 is provided at the lower end of the column protection tube 8, and the heights of the column protection tube 8 and the column 7 can be adjusted by the height adjustment member 11.

図４は、図３のハースベッド１を支持ロッド２により支持する部分の拡大図であり、通常ハースベッド１の上面は図１に示したように、ガラス板の支承具２４側が下辺となるように傾斜させるため、支持ロッド２はハースベッド１の下面に対して法線方向に設置し、係止具６の下部嵌合孔と嵌合する支柱７は、床面に対して垂直方向に設置した。 4 is an enlarged view of a portion where the hearth bed 1 of FIG. 3 is supported by the support rod 2. As shown in FIG. 1, the upper surface of the normal hearth bed 1 is such that the support 24 side of the glass plate is the lower side. The support rod 2 is installed in the normal direction with respect to the lower surface of the hearth bed 1, and the column 7 that fits into the lower fitting hole of the locking tool 6 is installed in the direction perpendicular to the floor surface. did.

また、ハースベッドが支持ロッドからズレて落下しないように、図示しないストッパーを落下防止用に設けている。 In addition, a stopper (not shown) is provided to prevent the hearth bed from falling off the support rod and falling.

尚、図１の符号２７はガスバーナーであり、符号２２は炉内雰囲気ガスを循環させる循環ファンである。 Reference numeral 27 in FIG. 1 denotes a gas burner, and reference numeral 22 denotes a circulation fan that circulates the furnace atmosphere gas.

次いで、本発明のハースベッドの支持構造の作用を説明する。 Next, the operation of the hearth bed support structure of the present invention will be described.

前記支持ロッド２、支柱７を低膨張性耐火物としたのは、加熱炉内に並設するハースベッド１、１、・・を支持する支持ロッド２や支柱７を冷間で高さ調整しても、加熱後の支持ロッド２や支柱７の熱膨張により、並設したハースベッド１、１、・・間の高さに段差が生じないようにし、ハースベッド１上で浮上するガラス板がハースベッド１に衝突したり接触したりしないように熱間において再調整を不要とするものである。 The support rod 2 and the support column 7 are made of a low-expansion refractory. The height of the support rod 2 and the support column 7 supporting the hearth beds 1, 1,. However, the thermal expansion of the support rod 2 and the support column 7 after heating does not cause a step in the height between the arranged hearth beds 1, 1,. In order not to collide with or come into contact with the hearth bed 1, readjustment is not necessary during the heat.

すなわち、支持ロッド２、支柱７を低膨張性耐火物とすれば、冷間で高さ調整したあとに、熱間での再調整作業は不要となる。 That is, if the support rod 2 and the support column 7 are made of a low-expansion refractory, a hot readjustment operation becomes unnecessary after the cold height adjustment.

また、支持ロッド２、支柱７を低膨張性耐火物としたのは、炉内の調整作業のために図１の加熱炉のドア２６や、図示しない覗き窓等の開閉により、炉内温度分布が一時的に変動して、ハースベッドの表面に段差が発生する要因ともなっている。 Moreover, the support rod 2 and the support column 7 are made of a low-expansion refractory because the furnace temperature distribution is provided by opening and closing the door 26 of the heating furnace in FIG. This is also a factor that causes a step on the surface of the hearth bed.

また、低膨張性耐火物の支持ロッド２、および支柱７の外周部に、それぞれ剛性の金属製の筒状保護管８、および支柱保護管８を被着させたのは、低膨張性耐火物が脆性であり、破損しやすいため、その補強を目的として設けられたものである。 The low expansion refractory is made by attaching the rigid metal cylindrical protective tube 8 and the column protective tube 8 to the outer periphery of the support rod 2 and the column 7 of the low expansion refractory, respectively. Since it is brittle and easily damaged, it is provided for the purpose of reinforcement.

さらに、筒状保護管３、および支柱保護管８の上端より、それぞれ支持ロッド２、および支柱７を熱間で１〜３ｍｍだけ上方に突出させるようにしたのは、ハースベッドの高さを支持ロッド２、および支柱７によって支配し、筒状保護管３、および支柱保護管８によって支配させないようにするためである。 Furthermore, the height of the hearth bed is supported by projecting the support rod 2 and the support column 7 upward by 1 to 3 mm from the upper ends of the cylindrical protection tube 3 and the support column protection tube 8, respectively. This is because it is controlled by the rod 2 and the support column 7 and is not controlled by the cylindrical protection tube 3 and the support column protection tube 8.

支柱７を上下方向に少なくとも３分割し、上下方向に直列に配設したのは、熱膨張等によって支柱７をカバーする支柱保護管８の変形時に、支柱７の材料が脆性材料であることにより折損するため、支柱７を分割し、支柱保護管８の変形に追従できるようにしたものである。 The column 7 is divided into at least three in the vertical direction and arranged in series in the vertical direction because the column 7 is made of a brittle material when the column protection tube 8 that covers the column 7 is deformed by thermal expansion or the like. In order to break, the support column 7 is divided so as to follow the deformation of the support column protection tube 8.

前記支柱を分割し、さらに支柱の外径と支柱保護管８の内径間に２ｍｍ程度の隙間を設けるようにしたのは、図５に示すように、支柱保護管８が熱膨張によりくの字状に変形した場合でも、分割した支柱のそれぞれの位置がずれて、支柱保護管８の変形に追従させて、折損しないようにするものである。 The column is divided and the gap between the outer diameter of the column and the inner diameter of the column protection tube 8 is about 2 mm. As shown in FIG. Even when deformed into a shape, the positions of the divided struts are shifted so as to follow the deformation of the strut protection tube 8 so as not to break.

尚、ハースベッド１に高さは、支持ロッド２、係止具６、支柱７、高さ調整部材１１の冷間から熱間への熱膨張を考慮して、冷間にて調整するが、材質のばらつきや誤差、炉内温度分布の変動等により、計算値とずれるが、線膨張率を低く抑えることにより、これらの膨張の絶対量を低く抑えることができる。 The height of the hearth bed 1 is adjusted in the cold in consideration of the thermal expansion from the cold to the hot of the support rod 2, the locking tool 6, the column 7, and the height adjusting member 11. Although it differs from the calculated value due to variations in materials, errors, fluctuations in furnace temperature distribution, etc., the absolute amount of these expansions can be kept low by keeping the linear expansion coefficient low.

以下に本発明の実施例を図面にもとづき詳述する。 Embodiments of the present invention will be described below in detail with reference to the drawings.

［実施例１］
第１図、第２図において、１、１、・・はハースベッドであり、通例きわめて線膨張係数の小さい耐火物からなり、その上面の多数の小孔から高温のガス体を噴出しその噴出圧力を利用してガラス板２を浮上かつ移動させるようになっている。 [Example 1]
In FIGS. 1 and 2, reference numerals 1, 1,... Are hearth beds, which are usually made of a refractory material having a very low linear expansion coefficient. The glass plate 2 is lifted and moved using pressure.

尚、図１に示すように、ガラス板Ｇは、ハースベッド１の側方にハースベッドに沿って張架した搬送チェーン２５に付設しハースベッド１の上面側域上を浮動しながら支承具２４により支承されて搬送移動される。 As shown in FIG. 1, the glass plate G is attached to a transport chain 25 stretched along the hearth bed to the side of the hearth bed 1 and floats on the upper side area of the hearth bed 1. It is supported and transported.

ハースベッド１の底部両側にはその長さ方向にわたり支持ブロック４、４、および該支持ブロック４、４の支持枠５、５を横設した。 Support blocks 4, 4 and support frames 5, 5 of the support blocks 4, 4 were horizontally provided on both sides of the bottom portion of the hearth bed 1.

前記支持ブロック４、４は、線膨張係数０．５４×１０^−６／℃の低膨張性耐火物である純度９９．９％以上の溶融シリカブロックを用いた。 As the support blocks 4 and 4, a fused silica block having a purity of 99.9% or more, which is a low-expansion refractory having a linear expansion coefficient of 0.54 × 10 ⁻⁶ / ° C., was used.

これによりガラス板の搬送方向におけるハースベッド１の膨張は微小である。 Thereby, the expansion of the hearth bed 1 in the conveyance direction of the glass plate is minute.

なお支持ブロック３は、断面コ字形の金属製支持枠５に担持されるため亀裂の発生を防ぎ、また破断しても落下することはないが、むしろ予め２〜３分割しておくと取り扱いに便利である。 The support block 3 is supported by a metal support frame 5 having a U-shaped cross section, so that it does not crack and does not fall even if it breaks. Convenient.

図３に示したように、支持ロッド２は、前記支持ブロック３と同様低膨張性耐火物よりなり、該支持ロッド２を筒状保護管３内に挿入したものを、ハースベッド１の四隅部において支持ブロック４および支持枠５に貫挿し、上端部がハースベッド１に当接し、下端部は金属製の係止具６の上部嵌合孔に挿入される。 As shown in FIG. 3, the support rod 2 is made of a low-expansion refractory material similar to the support block 3, and the support rod 2 inserted into the cylindrical protective tube 3 is the four corners of the hearth bed 1. Are inserted into the support block 4 and the support frame 5, the upper end is in contact with the hearth bed 1, and the lower end is inserted into the upper fitting hole of the metal locking tool 6.

係止具６には支柱７を挿入する下部嵌合孔をも有し、この下部嵌合孔および上部嵌合孔を仕切る隔壁の厚みは熱による膨張を考慮して、１０ｍｍとした。 The locking tool 6 also has a lower fitting hole into which the support column 7 is inserted. The thickness of the partition wall that partitions the lower fitting hole and the upper fitting hole is set to 10 mm in consideration of expansion due to heat.

支柱７は支持ブロック４と同様低膨張性耐火物よりなるもので支柱に立設しているが、その上部を残し金属製の支柱保護管８内に挿入することにより、支柱の亀裂が防止され、万が一破断しても崩壊する恐れはない。 The support column 7 is made of a low-expansion refractory material like the support block 4 and is erected on the support column. By inserting the support column 7 into the metal support tube 8 while leaving the upper part thereof, cracking of the support column is prevented. In the unlikely event that it breaks, there is no risk of collapse.

さらに支柱保護管８の下端には、高さ調整手段２０を固設して、手操作により図示しないハンドル等を回転させることにより、任意に高さを調整できるので、ガス炉の基盤が水平でなかつたり、ハースベッド１、１の厚み、すなわち高さに若干の誤差があるような場合等にもハースベッド１、１の上面を揃えるべく対処できる。 Further, a height adjusting means 20 is fixed to the lower end of the column protection tube 8, and the height can be adjusted arbitrarily by rotating a handle or the like (not shown) manually, so that the base of the gas furnace is horizontal. Even when there is a slight error in the thickness of the hearth beds 1, 1, that is, the height, it can be dealt with so that the upper surfaces of the hearth beds 1, 1 are aligned.

前記支持ロッド２および支柱７の周囲には、それぞれステンレス製の筒状保護管３、および支柱保護管８を被着させ、冷間において、支持ロッド２、および支柱７のそれぞれの上端が筒状保護管３、および支柱保護管８の上端より２ｍｍだけ上方に突出させるように調整した。 A cylindrical protection tube 3 and a support column 8 made of stainless steel are attached around the support rod 2 and the support column 7, respectively, and the upper ends of the support rod 2 and the support column 7 are cylindrical in the cold state. Adjustment was made so as to protrude upward by 2 mm from the upper ends of the protective tube 3 and the column protective tube 8.

すなわち、図３に示した一例において、冷間における支持ロッド２（低膨張性耐火物）の長さａ＝８７ｍｍ、筒状保護管３の長さ＝８５ｍｍとすると、７００℃まで加熱した時の支持ロッド２の上端と、筒状保護管の上端との差は、
２ｍｍ＋（８７×０．５４×１０^−６／℃−８５ｍｍ×１２×１０^−６／℃）×７００℃
＝２ｍｍ−０．６８ｍｍ＝１．３２ｍｍ
すなわち、支持ロッド２は、７００℃に加熱したときには、筒状保護管の上端より１．３２ｍｍ突出した状態でハースベッドを支持することになり、ハースベッドの上面レベルに対し支持ロッドや筒状保護管の熱膨張による影響を受けることはない。 That is, in the example shown in FIG. 3, when the length of the support rod 2 (low expansion refractory material) in the cold is a = 87 mm and the length of the cylindrical protective tube 3 is 85 mm, The difference between the upper end of the support rod 2 and the upper end of the cylindrical protective tube is
2 mm + (87 × 0.54 × 10 ⁻⁶ / ° C.−85 mm × 12 × 10 ⁻⁶ / ° C.) × 700 ° C.
= 2mm-0.68mm = 1.32mm
That is, when the support rod 2 is heated to 700 ° C., the support rod 2 supports the hearth bed in a state where it protrudes 1.32 mm from the upper end of the cylindrical protection tube, and the support rod and the cylindrical protection with respect to the upper surface level of the hearth bed. It is not affected by the thermal expansion of the tube.

また、支柱７（低膨張性耐火物）の長さ６２０ｍｍのうち７００℃まで昇温する温度領域内にある部分の長さｃ＝１８０ｍｍ、３００℃まで昇温する温度領域内にある炉床部以下の長さｄ＝４４０ｍｍ、係止具６（ステンレス製）の支持ロッド２と支柱７の先端部間の肉厚ｂ＝１０ｍｍ、高さ調整部材１１（ＳＳ鉄鋼材）の長さｅ＝６４０ｍｍとすれば、これらを７００℃に加熱した時の支持ロッド２から高さ調整部材１１までの全体の膨張後の長さは、
（（ａ＋ｃ）×０．５４×１０^−６／℃＋ｂ×１８Ｘ１０^−６／℃）×７００℃＋ｄ×０．５４×１０^−６／℃×３００℃＋ｅ×１１×１０^−６／℃×１００℃
＝（（８７ｍｍ＋１８０ｍｍ）×０．５４×１０^−６／℃＋１０ｍｍ×１８×１０^−６／℃）×７００℃＋４４０ｍｍ×０．５４×１０^−６／℃×３００℃＋６４０ｍｍ×１１×１０^−６／℃×１００℃
＝０．１０９＋０．１２６＋０．０７１＋０．７０４≒１．０６ｍｍ
ただし、シリカの膨張係数は、０．５４×１０^−６／℃であり、ステンレスの膨張係数は、１８×１０^−６／℃、ＳＳ鉄鋼材の線膨張係数は、１１×１０^−６／℃である。 Further, the length c of the column 7 (low expansion refractory) of 620 mm in the temperature range where the temperature is raised to 700 ° C. c = 180 mm, the hearth portion in the temperature range where the temperature is raised to 300 ° C. The following length d = 440 mm, thickness b = 10 mm between the support rod 2 of the locking tool 6 (made of stainless steel) and the tip of the column 7, and the length e of the height adjusting member 11 (SS steel material) = 640 mm Then, when these are heated to 700 ° C., the total length after expansion from the support rod 2 to the height adjusting member 11 is
((A + c) × 0.54 × 10 -6 / ℃ + b × 18X10 -6 /℃)×700℃+d×0.54×10 -6 / ℃ × 300 ℃ + e × 11 × 10 -6 / ℃ × 100 ℃
= ((87mm + 180mm) × 0.54 × 10 -6 / ℃ + 10mm × 18 × 10 -6 /℃)×700℃+440mm×0.54×10 -6 / ℃ × 300 ℃ + 640mm × 11 × 10 -6 / ℃ × 100 ℃
= 0.109 + 0.126 + 0.071 + 0.704 ≒ 1.06mm
However, the expansion coefficient of silica is 0.54 × 10 ⁻⁶ / ° C., the expansion coefficient of stainless steel is 18 × 10 ⁻⁶ / ° C., and the linear expansion coefficient of SS steel is 11 × 10 ⁻⁶ / ° C. It is.

したがつてこれらの寸法にバラツキがない限り並設するハースベッドの上面は揃っていてこれらが不均一に加熱されたとしてもその膨張差は実操業上支障ない程度のものである。 Therefore, as long as these dimensions do not vary, the upper surfaces of the hearth beds arranged side by side are aligned, and even if they are heated unevenly, the difference in expansion is such that there is no problem in practical operation.

［実施例２］
第５図に示したように、支柱７を３分割し、さらに支柱７の外径と支柱保護管８の内径間に２ｍｍ程度の隙間を設けるようにした。その他については、実施例１と同じである。 [Example 2]
As shown in FIG. 5, the support column 7 was divided into three parts, and a gap of about 2 mm was provided between the outer diameter of the support column 7 and the inner diameter of the support column protection tube 8. About others, it is the same as Example 1.

この場合は、ハースベッドの段差については、実施例１と同一効果が得られる。しかし、支柱保護管８が熱膨張により図５の２点鎖線の符号８’で示したように、くの字状に変形した時に、図７に示したような分割していない支柱７’を設けた場合に較べると、分割した支柱７のそれぞれの位置がずれて、支柱保護管８の変形形状に追従するため、支柱７の折損を免れることができる。 In this case, the same effect as the first embodiment can be obtained with respect to the step of the hearth bed. However, when the column protection tube 8 is deformed into a dogleg shape as indicated by the two-dot chain line 8 'in FIG. 5 due to thermal expansion, the undivided column 7' as shown in FIG. Compared with the case where it provides, since each position of the divided | segmented support | pillar 7 shift | deviates and it follows the deformation | transformation shape of the support | pillar protection tube 8, breakage of the support | pillar 7 can be avoided.

［比較例１］
第６図に示したように、支持ロッド２の外周部に筒状保護管を設けず、支持ロッド２の材質をステンレス製とした以外の部材は実施例１と同一である。 [Comparative Example 1]
As shown in FIG. 6, members other than the cylindrical protective tube provided on the outer periphery of the support rod 2 and the support rod 2 made of stainless steel are the same as those in the first embodiment.

常温における長さａ＝８７ｍｍのステンレス製の支持ロッド２を７００℃に加熱した時のそれぞれの膨張代は、
８７ｍｍ×１２×１０^−６／℃×７００℃≒０．７３１ｍｍ
となり、実施例１の低膨張性耐火物製の場合の、
８７ｍｍ×０．５４×１０^−６／℃×７００℃≒０．０３３ｍｍ
と比較すると、膨張代の差が約０．７ｍｍ程大きくなり、炉内温度分布の変動や、製作誤差、材質等のばらつきによって、ハースベッド１、１、・・間の上面に大きな段差が発生する恐れがある。 Each expansion allowance when the support rod 2 made of stainless steel having a length a = 87 mm at room temperature is heated to 700 ° C. is as follows:
87 mm × 12 × 10 ^{−6 /} ° C. × 700 ° C.≈0.731 mm
And in the case of the low expansion refractory of Example 1,
87 mm × 0.54 × 10 ^{−6 /} ° C. × 700 ° C.≈0.033 mm
Compared with, the difference in expansion allowance is increased by about 0.7 mm, and a large step occurs on the upper surface between the hearth beds 1,... Due to fluctuations in furnace temperature distribution, manufacturing errors, variations in materials, etc. There is a fear.

本発明に係るハース炉を示した縦断面図A longitudinal sectional view showing a hearth furnace according to the present invention 本発明に係るハースベッドの支持構造の一例を示した斜視図The perspective view which showed an example of the support structure of the hearth bed which concerns on this invention 本発明の支持構造の要部縦断面図Main part longitudinal cross-sectional view of the support structure of this invention 本発明の支持構造の支柱と支持ロッドの縦断面の拡大図Enlarged view of vertical section of support column and support rod of support structure of the present invention 本発明の分割した支柱を示す要部縦断面図。The principal part longitudinal cross-sectional view which shows the support | pillar divided | segmented of this invention. 従来の支持構造の要部縦断面図Longitudinal sectional view of main part of conventional support structure 従来の支柱を示す要部縦断面図。The principal part longitudinal cross-sectional view which shows the conventional support | pillar.

Explanation of symbols

Ｇガラス
１ハースベッド
２支持ロッド
３筒状保護管
４支持ブロック
５支持枠
６係止具
７分割支柱
７’ 支柱
８支柱保護管
１０高さ調整手段
１１高さ調整部材
１２支持金具
１３高さ調整ねじ
２０高さ調整手段
２１炉壁
２３架台
２４支承具
２５搬送チェーン G Glass 1 Hearth bed 2 Support rod 3 Cylindrical protection tube 4 Support block 5 Support frame 6 Locking tool 7 Dividing column 7 'Column 8 Column protection tube 10 Height adjusting means 11 Height adjusting member 12 Support metal fitting 13 Height adjustment Screw 20 Height adjusting means 21 Furnace wall 23 Mounting base 24 Bearing 25 Conveying chain

Claims

In the support structure of the hearth bed arranged in parallel in the heating furnace that conveys the glass plate while floating,
A support block horizontally provided parallel to the conveying direction of the glass plate on two opposite sides of the bottom portion of the hearth bed of the gas furnace, and a support frame for fitting the lower surface of the support block;
A support rod that is inserted into the support block and the support frame at the four corners of the hearth bed and is inserted into the upper fitting hole of the latch located below;
The upper end is inserted into the lower fitting hole of the locking tool and consists of a support column erected from the holding stand.
The support rod, support block, and column are made of ceramic refractory with low expansion, and a cylindrical protective tube and a column protective tube made of a rigid and heat-resistant material are attached around the support rod and the column, respectively. A support structure for a hearth bed, wherein the upper end of each of the support rod and the support column protrudes upward from the upper end of the cylindrical protection tube and the support column protection tube during the heat of time.

2. The hearth bed support structure according to claim 1, wherein the support column is divided into at least three.

3. The hearth bed support structure according to claim 2, wherein a gap is provided between an outer diameter of the divided support column and an inner diameter of the support column protection tube.