JP4106168B2 - Airtight device for large diameter rotating body - Google Patents

Airtight device for large diameter rotating body Download PDF

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Publication number
JP4106168B2
JP4106168B2 JP33980399A JP33980399A JP4106168B2 JP 4106168 B2 JP4106168 B2 JP 4106168B2 JP 33980399 A JP33980399 A JP 33980399A JP 33980399 A JP33980399 A JP 33980399A JP 4106168 B2 JP4106168 B2 JP 4106168B2
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Japan
Prior art keywords
rotating body
diameter rotating
sliding
airtight device
annular seal
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JP33980399A
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JP2001153563A (en
Inventor
智郎 吉武
美郎 時村
重 御手洗
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Nippon Steel Engineering Co Ltd
Nippon Steel Plant Designing Corp
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Nittetsu Plant Designing Corp
Nippon Steel Engineering Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、例えば、産業廃棄物処理設備、セメント、アルミナ、コークス、石灰石等の製造設備に使用されるロータリーキルン、ロータリークーラ、ロータリドライヤ等の回転体と、その周囲に配置された固定部材とのガスシールを行う大径回転体の気密装置に関する。
【0002】
【従来の技術】
ロータリーキルンやロータリークーラ等は、傾斜した回転円筒形の装置で、内部装入物を転動によって軸方向下流側に移動させ、ガスとの熱交換によってこれを加熱する。内部の燃焼を制御するため、その装入口や排出口をエアシールすることによって、外部からの空気の侵入を防止していた。このエアシールの方法として、ラビリンスシールを用いたものや、例えば、実開昭57−63157号公報には、シール部分に弾性を有するシールプレートを使用したものが提案されている。また、特公平5−71869号公報に記載のように、密封装置を多数のバネ部材を部分的に重ねて環状配置して構成したものも提案されている。
しかし、前記ラビリンスシールだけではシール作用が十分でなく、侵入空気が多く燃焼制御が困難となっていた。また、実開昭57−63157号公報に記載のエアシール装置においては、回転体が真円の場合には特に問題がないが、回転体が大径の場合は、一般的に外周面が均一とならず、隙間があいて空気が漏れるという問題があった。さらに、特公平5−71869号公報に記載の密封装置においても、多数のバネ部材から漏れる空気があり、使用する装置によってはシールが不十分な場合があった。
【0003】
これらの発明の欠点を補うため、本願出願人は、特開平09−079756号公報において、図6に示す気密装置70を開示した。気密装置70は、大径回転体71の周面にローラチェーン72を巻き付け、リング状で断面L字状の弾性シール部材73を有している。弾性シール部材73は、大径回転体71の半径方向外側に隙間を有して配置された固定部材74に、その外側端部を取付け、内側端部を大径回転体71の周面に摺接させている。そして、中間部をローラチェーン72のL字形リンクプレート75に取付け金具76、77を介して固定している。このように構成することによって、大径回転体71の周面の凹凸に追随してシールを行うことができた。
【0004】
【発明が解決しようとする課題】
しかしながら、前記従来の気密装置は、ロータリーキルン等の内圧が上昇すると、シール部分を介して大径回転体71の内部から外部にガスが噴出することがあった。また、大径回転体71が大きく重量があるためシール材に加わる力が大きくなり、シール寿命が短かった。
本発明はかかる事情に鑑みてなされたもので、内部ガスの噴出を防ぎ、シール材の寿命を長くすることができる大径回転体の気密装置を提供することを目的とする。
【0005】
【課題を解決するための手段】
前記目的に沿う発明に係る大径回転体の気密装置は、駆動源によって駆動される大径回転体と、その周囲に少しの隙間を有して設けられた固定部材とのシールを行う気密装置であって、前記大径回転体の外周に断面山形状に設けられ、対となって予め表面加工された摺動部を備えた傾斜リング部材と、該傾斜リング部材の半径方向外側に位置し、前記固定部材に取付けリング部材を介して軸方向に重合して設けられ、それぞれの半径方向内側の端部を前記傾斜リング部材の各摺動部にそれぞれ押し当てる環状シール部材とを有する。
対となる摺動部にそれぞれの内側端部が押し当てられる環状シール部材を有しているので、シール部分を2重にして正圧時にガスが外部に噴出することを防止することができる。また、摺動部を断面山形状に形成しているので、重合する環状シール部材による押圧方向を稜線方向の両側に分散でき、大径回転体に加わる摺動抵抗力を均等にして、運転時のシール部材の傾きやねじれを防止することができる。
【0006】
ここで、前記環状シール部材は、板状弾性体をシール材で覆って構成することも可能である。
板状弾性体としては、例えば、ゴム(好ましくは耐熱性を有するゴム)や可撓性のプラスチックや金属板等を使用することができる。シール材には、例えば、アスベスト等の耐摩耗性、耐熱性を有するものを使用することができる。可撓性に優れた板状弾性体を耐摩耗性に優れたシール材で覆うことによって、シール部に一定圧力を安定して加えることができると共に摺動による摩耗を少なくし、また板状弾性体に直接熱が伝わらないようにして、環状シール部材の寿命を長くすることができる。
【0007】
発明に係る大径回転体の気密装置において、前記摺動部に、給脂配管を介して潤滑剤を連続、又は断続的に供給することも可能である。潤滑剤を供給するので、摺動抵抗を減らして環状シール部材の寿命を長くすることができる。
【0008】
【発明の実施の形態】
続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態について説明し、本発明の理解に供する。
図1、図2に示すように、本発明の第1の実施の形態に係る大径回転体の気密装置10、11は、ロータリーキルン29の図示しない駆動源によって駆動される横置きされた大径回転体12と、その周囲に少しの隙間を有して設けられた固定部材13とのシールを行う装置である。
まず、図2を参照して、気密装置10、11を適用するロータリーキルン29の構成について説明する。なお、図1〜図3では、左側を上流側、右側を下流側とする。
大径回転体12を囲む固定部材13の大径回転体12より上流側位置には、大径回転体12に原料を供給するスクリューフィーダ30が設けられ、その直上部には、大径回転体12内の原料を加熱するバーナ31が設けられている。また、大径回転体12の周面が載置される固定部材13の下部の中央には、駆動源からのトルクを大径回転体12に伝達するスプロケット32、33及び図示しないチェーンが設けられ、その上、下流側には、大径回転体12を回転可能に支持する従動ローラ34、35がそれぞれ設けられている。
大径回転体12は、内部に耐火物36を施工し、外周を鉄皮37で覆った円筒状の部材で、上流側端部に供給口43、下流側端部に排出口44を有している。
固定部材13に設けられたスプロケット33、及び従動ローラ34、35に符合する大径回転体12の外周面上には、チェーンでスプロケット33と連結される大径スプロケット38、及び2本の環状レール部材39がそれぞれ設けられている。
気密装置10、11は、大径回転体12の上流側端部、及び下流側端部の外周の半径方向外側に隙間を有して設けられた筒状フランジ部にそれぞれ設けられている。筒状フランジ部と鉄皮37の間には、冷却用の空気が吹き込まれ、シール部分の温度上昇を抑えている。以下、図1を参照して気密装置10について詳しく説明する。
【0009】
気密装置10は、回転する大径回転体12の上流側の外周に筒状フランジ部、取付けフランジ部40、41を介して円錐台側部形状の摺動部14、15を備えた傾斜リング部材16、17を固着して設けている。傾斜リング部材16、17の摺動部14、15は対となって予め表面加工されており、それぞれの拡径部側を対向させ断面山形状に配置されている。
また、気密装置10は、傾斜リング部材16、17の半径方向外側に位置する環状シール部材18、19を有している。
環状シール部材18、19は、それぞれ耐熱素材であって板状弾性体の一例である環状ゴム板25をシール材の一例であるアスベストクロス26で覆って構成される無負荷状態では同一形状の部材である。
【0010】
環状シール部材18、19の各々の半径方向の外側端部22は、固定部材13に設けられた環状取付け部20に、断面L字状の取付けリング部材21を介して軸方向に重合して取付けられている。環状取付け部20、取付けリング部材21、環状シール部材18、19の外側端部22は、それぞれ複数のボルト23及びナット24によって周方向に所定間隔おきに締結固定されている。
環状シール部材18、19のそれぞれの半径方向内側の端部は、傾斜リング部材16、17の各摺動部14、15にそれぞれ押し当てられている。環状シール部材18は、傾斜リング部材16の下流側に拡径した摺動部14に当接して上流側に屈曲し、環状シール部材19は、逆に下流側に屈曲している。すなわち、環状シール部材18、19は、それぞれを構成する環状ゴム板25の復元力を利用して傾斜リング部材16、17の各摺動部14、15を一定圧力で押圧しているのである。この押圧力は、環状ゴム板25の厚みtと、傾斜リング部材16の摺動部14、15の傾斜角度θによって調整可能であり、本実施の形態では、厚みtを3〜10mm、傾斜角度θを20〜70度、(好ましくは45〜65度)に設定している。
【0011】
気密装置10より上流側の大径回転体12と固定部材13の隙間には、環状に形成された固定板27を介してゴミ避けとなるアスベストヤーン28が環状配置されている。なお、アスベストヤーン28には、大径回転体12の内圧の急激な変動を吸収するダンパーの役目も果たしている。
図2に示すように、大径回転体12の下流側の端部付近に設けられた気密装置11は、上流側に設けられた気密装置10と同じ形状、構造で対向配置されているので、説明は省略する。
次に、ロータリーキルン29の稼働時の気密装置10、11の状態について説明する。
【0012】
大径回転体12にスプロケット32、33、大径スプロケット38を介して動力が伝達されると、大径回転体12は、外周面に取付けられ従動ローラ34、35に支持される環状レール部材39と共に回転する。また、大径回転体12の上、下流側端部にそれぞれ設けられた気密装置10、11の各環状シール部材18、19は、各傾斜リング部材16、17の摺動部14、15に押圧された状態で摺動しながら回転する。
大径回転体12の外周面は、真円状に形成することが難しく、このため、大径回転体12の各環状レール部材39の軸芯が一致せず、傾きや振動を伴って回転し、シール位置が軸方向、半径方向にずれることがあった。
【0013】
例えば、大径回転体12が固定部材13に対して下流側に移動した場合、環状シール部材18が摺動部14を押圧する力は弱くなるが、環状シール部材19が摺動部15を押圧する力は強くなる。また、大径回転体12が上流側に移動すると、逆に環状シール部材18の力が強くなり、環状シール部材19による力が弱くなる。このように、シール部分を2重に設け、各摺動部14、15を対向させ傾斜配置しているので、大径回転体12の軸方向への移動に伴うシール部分の圧力の低下を防止することができ、大径回転体12内が高圧になってもガスがシール部分から外部に噴出することを防止することができる。
また、環状シール部材18、19は環状ゴム板25を屈曲させてシールしているので、大径回転体12が半径方向外側、又は内側に移動したときでも、環状シール部材18、19は、大径回転体12の動きに追随してシールを行うことができ、また、シール部分が2重になっているので、確実にシールすることができる。
【0014】
次に、図3を参照して、変形例に係る気密装置42について説明する。なお、気密装置42は、気密装置10に給脂配管45を追加しただけなので、気密装置10と同一の部材には同一番号を付して、説明を省略する。
傾斜リング部材16、17の摺動部14、15にはグリス供給用の孔が周方向に所定間隔で形成されている。摺動部14、15の裏側には、それぞれ給脂配管45の先部が取付けられ、給脂配管45の基部側は、図示しないグリス供給装置又は、供給容器に接続されている。供給方法は、手動でもよく、また、コンプレッサーを使用して自動で行うことも可能である。
このように構成することによって、給脂配管45を介して摺動部14、15に潤滑剤を連続、又は断続的に供給することができる。そして、摺動部14、15及び環状シール部材18、19の摺動時の摩擦抵抗を小さくして、環状シール部材18、19の寿命を長くすることができる。
【0015】
続いて、図4、図5を参照して、第2の実施の形態に係る大径回転体の気密装置46について説明する。
気密装置46は、駆動源によって駆動される大径回転体12と、その周囲に少しの隙間を有して設けられた固定部材13とのシールを行う気密装置であって、第1の実施の形態に係る大径回転体の気密装置10、11と実質的に同じ位置に設けられ、ロータリーキルン29に適用することができる。以下、気密装置46をロータリーキルン29の下流側に設けた場合について説明する。なお、既に説明した部材と同一の部材には同一番号を付して、説明を省略する。
気密装置46は、大径回転体12の外周に筒状フランジ部を介して固定配置され、予め表面加工された摺動部53をその周面に備える摺動リング部材47を有し、摺動リング部材47の半径方向外側には、無端チェーン部材49が摺接して巻着されている。
【0016】
摺動リング部材47は、その外周面を摺動部53としている。無端チェーン部材49は、摺動リング部材47の周方向に設けられた多数のローラ50の軸方向の両側(上、下流側)を、平板状のリンクプレート51と、外側端部を軸方向の両側にそれぞれ伸延させた取付け部材を含む断面L字形のリンクプレート52でそれぞれ交互に連結して構成されている。無端チェーン部材49の周方向の所定位置には、隣合うローラ50を近づける方向に付勢する、例えば、コイルばね等の緊張手段が設けられている。
無端チェーン部材49には、半径方向内側が開口した弾性中空環状部材の一例であるタイヤ状ゴム環54がその外側から被せられている。タイヤ状ゴム環54の開口部を形成する両端部55、56は、ローラ50の上、下流側にそれぞれ少しの隙間を有して配置されている。なお、両端部55、56が自由状態にあるときには、ローラ50の内側端(摺動部53と同一面)より半径方向内側に少し突出する状態となるように構成されている。
【0017】
気密装置46は、固定部材13と、無端チェーン部材49を連結してシールを行う環状シール部材57を有している。2枚の環状シール部材57は、それぞれの外側端部が軸方向に重合して設けられ、重合した外側端部を固定部材13に取付けリング部材21、環状取付け部20を介して取付けている。2枚の環状シール部材57は、それぞれの内側部で、タイヤ状ゴム環54を軸方向両側から挟み、また、各々の内側端部をタイヤ状ゴム環54の両端部55、56の下方に対向配置し、摺動リング部材47に摺接させている。そして、各環状シール部材57の内側部を、タイヤ状ゴム環54を介して、リンクプレート52の取付け部材にボルト58及びナット59を使用して締結固定している。
無端チェーン部材49は環状シール部材57等を介して固定部材13に接続されているので、摺動リング部材47を固着した大径回転体12が回転しても、無端チェーン部材49本体は周方向に移動せずに、ローラ50のみが摺動リング部材47に当接した状態で回転する。環状シール部材57は、バネ性を有するタイヤ状ゴム環54の両端部55、56によって半径方向内側に付勢され、回転する摺動リング部材47の摺動部53に押圧される。
【0018】
環状シール部材57の内側部は、緊張手段を備えた無端チェーン部材49に取付けられ、その両端部が摺動リング部材47に当接しているので、大径回転体12が偏心等の原因によって半径方向、又は軸方向に移動しても、環状シール部材57の両端部を無端チェーン部材49と共に追随して移動させることができ、摺動リング部材47の摺動部53に与える押圧力の変動を防止することができる。また、端部をローラ50の上、下流側の2箇所に設けているので、シールを2重構造にすることができ、大径回転体12内の圧力が急激に上昇して気体が噴出することを防止することができる。
なお、本実施の形態においても、図示しない給脂配管を介して摺動部53に潤滑剤を連続、又は断続的に供給することが可能である。
【0019】
以上、本発明に係る実施の形態について説明してきたが、本発明は、前記実施の形態に限定されるものではなく、例えば、取付けリング部材21を、金属製のものに限定することも可能である。金属製であるので、強度を強くして、環状シール部材の大きさ、及びこれに加わる張力を小さくして破損を防止することができる。
また、前記実施の形態において説明した各部材のうち、環状に形成したもの(例えば、環状シール部材18、19や傾斜リング部材16、17)は2〜8に分割して製造することも可能である。分割することによって、各部材を安価に製造することができ、また、交換も簡単に行うことができる。
また、各部材の連結は、ボルト及びナットを使用して、交換やメンテナンスを容易に行うことができるように構成しているが、溶接等の他の固定手段を利用することも可能である。また、使用するグリスは、環状シール部材側から供給することもできる。
【0020】
【発明の効果】
請求項1〜3記載の大径回転体の気密装置においては、対となる摺動部と重合する環状シール部材を有しているので、シール部分を2重にして正圧時に内部ガスが外部に噴出することを防止することができる。また、摺動部を断面山形状に形成しているので、環状シール部材による押圧方向を軸方向の両側に分散でき、大径回転体に加わる摺動抵抗力を均等にして、運転時のシール部材の傾きやねじれを防止することができる。
特に、請求項2記載の大径回転体の気密装置においては、環状シール部材は、板状弾性体をシール材で覆って構成されるので、可撓性と耐摩耗性を向上させ、シール部に一定圧力を安定して加えることができると共に摺動による摩耗を少なくし、また板状弾性体に直接熱が伝わらないようにして、環状シール部材の寿命を長くすることができる。
請求項記載の大径回転体の気密装置においては、潤滑剤を供給するので、摺動抵抗を減らして環状シール部材の寿命を長くすることができる。
【図面の簡単な説明】
【図1】本発明の第1の実施の形態に係る気密装置の断面図である。
【図2】同気密装置を適用したロータリーキルンの断面図である。
【図3】同気密装置の変形例に係る気密装置の断面図である。
【図4】本発明の第2の実施の形態に係る気密装置の断面図である。
【図5】同気密装置の部分拡大断面図である。
【図6】従来例に係る気密装置の断面図である。
【符号の説明】
10、11:気密装置、12:大径回転体、13:固定部材、14、15:摺動部、16、17:傾斜リング部材、18、19:環状シール部材、20:環状取付け部、21:取付けリング部材、22:外側端部、23:ボルト、24:ナット、25:環状ゴム板(板状弾性体)、26:アスベストクロス(シール材)、27:固定板、28:アスベストヤーン、29:ロータリーキルン、30:スクリューフィーダ、31:バーナ、32、33:スプロケット、34、35:従動ローラ、36:耐火物、37:鉄皮、38:大径スプロケット、39:環状レール部材、40、41:取付けフランジ部、42:気密装置、43:供給口、44:排出口、45:給脂配管、46:気密装置、47:摺動リング部材、49:無端チェーン部材、50:ローラ、51:リンクプレート、52:リンクプレート(取付け部材)、53:摺動部、54:タイヤ状ゴム環(弾性中空環状部材)、55、56:端部、57:環状シール部材、58:ボルト、59:ナット
[0001]
BACKGROUND OF THE INVENTION
The present invention includes, for example, a rotary kiln, a rotary cooler, a rotary dryer and the like used in industrial waste treatment facilities, cement, alumina, coke, limestone and other production facilities, and a fixing member disposed around the rotary member. The present invention relates to an airtight device for a large-diameter rotating body that performs gas sealing.
[0002]
[Prior art]
A rotary kiln, a rotary cooler, or the like is an inclined rotating cylindrical device that moves an internal charge to the downstream side in the axial direction by rolling and heats it by exchanging heat with gas. In order to control internal combustion, air intrusion from the outside is prevented by air-sealing the inlet and outlet. As a method of this air seal, a method using a labyrinth seal, or a method using a seal plate having elasticity at a seal portion is proposed in, for example, Japanese Utility Model Publication No. 57-63157. In addition, as described in Japanese Patent Publication No. 5-71869, a sealing device in which a large number of spring members are partially overlapped and arranged annularly has been proposed.
However, the labyrinth seal alone does not provide a sufficient sealing action, and the amount of intrusion air is large, making combustion control difficult. In the air seal device described in Japanese Utility Model Publication No. 57-63157, there is no particular problem when the rotating body is a perfect circle. However, when the rotating body has a large diameter, the outer peripheral surface is generally uniform. However, there was a problem that air leaked due to a gap. Furthermore, even in the sealing device described in Japanese Patent Publication No. 5-71869, there is air leaking from a large number of spring members, and the seal may be insufficient depending on the device used.
[0003]
In order to compensate for the drawbacks of these inventions, the present applicant has disclosed an airtight device 70 shown in FIG. 6 in Japanese Patent Application Laid-Open No. 09-079756. The hermetic device 70 has a roller chain 72 wound around a circumferential surface of a large-diameter rotating body 71, and has an elastic seal member 73 having a ring shape and an L-shaped cross section. The elastic seal member 73 has an outer end attached to a fixing member 74 arranged with a gap on the outer side in the radial direction of the large-diameter rotating body 71, and an inner end slid on the peripheral surface of the large-diameter rotating body 71. Touching. The intermediate portion is fixed to the L-shaped link plate 75 of the roller chain 72 via mounting brackets 76 and 77. With this configuration, the sealing can be performed following the irregularities on the peripheral surface of the large-diameter rotating body 71.
[0004]
[Problems to be solved by the invention]
However, in the conventional airtight device, when the internal pressure of the rotary kiln or the like rises, gas may be ejected from the inside of the large-diameter rotating body 71 to the outside through the seal portion. Further, since the large-diameter rotating body 71 is large and heavy, the force applied to the sealing material is increased, and the seal life is short.
This invention is made | formed in view of this situation, and it aims at providing the airtight apparatus of the large diameter rotary body which can prevent the ejection of an internal gas and can lengthen the lifetime of a sealing material.
[0005]
[Means for Solving the Problems]
An airtight device for a large-diameter rotating body according to the present invention that meets the above-mentioned object is an airtight seal that seals between a large-diameter rotating body that is driven by a drive source and a fixing member that is provided with a small gap around it An inclined ring member provided with a sliding portion provided in a cross-sectional mountain shape on the outer periphery of the large-diameter rotating body and previously surface-treated as a pair, and an apparatus positioned radially outward of the inclined ring member And an annular seal member that is provided by being overlapped with the fixing member in the axial direction via an attachment ring member and that presses each radially inner end portion against each sliding portion of the inclined ring member.
Since it has the annular seal member by which each inner side edge part is pressed by the sliding part used as a pair, it can prevent that a gas blows outside at the time of a positive pressure by making a seal part double. In addition, since the sliding part is formed in a cross-sectional mountain shape, the pressing direction by the overlapping annular seal member can be dispersed on both sides of the ridge line direction, and the sliding resistance force applied to the large-diameter rotating body is made even during operation. It is possible to prevent the seal member from tilting or twisting.
[0006]
Here, the annular sealing member may be configured by covering a plate-like elastic body with a sealing material.
As the plate-like elastic body, for example, rubber (preferably heat-resistant rubber), flexible plastic, metal plate, or the like can be used. As the sealing material, for example, a material having wear resistance and heat resistance such as asbestos can be used. Covering a flexible plate-like elastic body with a sealing material with excellent wear resistance allows a constant pressure to be stably applied to the seal part, reduces wear caused by sliding, and provides plate-like elasticity. The life of the annular seal member can be extended by preventing heat from being transmitted directly to the body.
[0007]
In the airtight device for a large-diameter rotating body according to the present invention, it is also possible to continuously or intermittently supply the lubricant to the sliding portion via a greasing pipe. Since the lubricant is supplied, the sliding resistance can be reduced and the life of the annular seal member can be extended.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
As shown in FIGS. 1 and 2, the large-diameter rotating body hermetic device 10, 11 according to the first embodiment of the present invention has a large-diameter transversely driven by a drive source (not shown) of the rotary kiln 29. This is a device that seals between the rotating body 12 and the fixing member 13 provided with a small gap around the rotating body 12.
First, with reference to FIG. 2, the structure of the rotary kiln 29 which applies the airtight apparatuses 10 and 11 is demonstrated. 1 to 3, the left side is the upstream side and the right side is the downstream side.
A screw feeder 30 for supplying the raw material to the large-diameter rotator 12 is provided at a position upstream of the large-diameter rotator 12 of the fixing member 13 surrounding the large-diameter rotator 12. A burner 31 for heating the raw material in 12 is provided. Sprockets 32 and 33 for transmitting torque from the drive source to the large-diameter rotary body 12 and a chain (not shown) are provided at the center of the lower portion of the fixing member 13 on which the peripheral surface of the large-diameter rotary body 12 is placed. In addition, driven rollers 34 and 35 for rotatably supporting the large-diameter rotating body 12 are provided on the downstream side, respectively.
The large-diameter rotating body 12 is a cylindrical member having a refractory 36 formed therein and covered with an iron skin 37, and has a supply port 43 at an upstream end and a discharge port 44 at a downstream end. ing.
A large-diameter sprocket 38 connected to the sprocket 33 by a chain and two annular rails are disposed on the outer peripheral surface of the large-diameter rotating body 12 that coincides with the sprocket 33 provided on the fixed member 13 and the driven rollers 34 and 35. Each member 39 is provided.
The airtight devices 10 and 11 are respectively provided on the upstream end of the large-diameter rotating body 12 and the cylindrical flange portion provided with a gap on the outer periphery in the radial direction of the outer periphery of the downstream end. Cooling air is blown between the cylindrical flange portion and the iron skin 37 to suppress the temperature rise of the seal portion. Hereinafter, the airtight device 10 will be described in detail with reference to FIG.
[0009]
The hermetic device 10 includes an inclined ring member provided with sliding portions 14 and 15 in the shape of a truncated cone through a cylindrical flange portion and mounting flange portions 40 and 41 on the outer periphery on the upstream side of the rotating large-diameter rotating body 12. 16 and 17 are fixedly provided. The sliding portions 14 and 15 of the inclined ring members 16 and 17 are previously surface-treated in pairs, and are arranged in a cross-sectional mountain shape with the respective enlarged diameter portions facing each other.
In addition, the airtight device 10 includes annular seal members 18 and 19 located on the radially outer side of the inclined ring members 16 and 17.
The annular seal members 18 and 19 are members having the same shape in an unloaded state in which an annular rubber plate 25 which is a heat-resistant material and is an example of a plate-like elastic body is covered with an asbestos cloth 26 which is an example of a seal material. It is.
[0010]
The outer end 22 in the radial direction of each of the annular seal members 18, 19 is attached to the annular attachment portion 20 provided on the fixing member 13 by overlapping in the axial direction via an attachment ring member 21 having an L-shaped cross section. It has been. The outer end portions 22 of the annular mounting portion 20, the mounting ring member 21, and the annular seal members 18, 19 are fastened and fixed at predetermined intervals in the circumferential direction by a plurality of bolts 23 and nuts 24, respectively.
The radially inner ends of the annular seal members 18 and 19 are pressed against the sliding portions 14 and 15 of the inclined ring members 16 and 17, respectively. The annular seal member 18 is in contact with the sliding portion 14 whose diameter is expanded on the downstream side of the inclined ring member 16 and bent upstream, and the annular seal member 19 is bent downstream. That is, the annular seal members 18 and 19 press the sliding portions 14 and 15 of the inclined ring members 16 and 17 with a constant pressure by using the restoring force of the annular rubber plate 25 constituting each. This pressing force can be adjusted by the thickness t of the annular rubber plate 25 and the inclination angle θ of the sliding portions 14 and 15 of the inclined ring member 16, and in this embodiment, the thickness t is 3 to 10 mm and the inclination angle. θ is set to 20 to 70 degrees (preferably 45 to 65 degrees).
[0011]
An asbestos yarn 28 that avoids dust is arranged in an annular shape in the gap between the large-diameter rotating body 12 and the fixing member 13 upstream of the airtight device 10 through an annular fixing plate 27. The asbestos yarn 28 also serves as a damper that absorbs sudden fluctuations in the internal pressure of the large-diameter rotating body 12.
As shown in FIG. 2, the airtight device 11 provided in the vicinity of the downstream end of the large-diameter rotating body 12 is oppositely arranged in the same shape and structure as the airtight device 10 provided on the upstream side. Description is omitted.
Next, the state of the airtight devices 10 and 11 during operation of the rotary kiln 29 will be described.
[0012]
When power is transmitted to the large-diameter rotating body 12 through the sprockets 32 and 33 and the large-diameter sprocket 38, the large-diameter rotating body 12 is attached to the outer peripheral surface and supported by the driven rollers 34 and 35. Rotate with. Further, the annular seal members 18 and 19 of the airtight devices 10 and 11 provided on the upstream and downstream ends of the large-diameter rotating body 12 are pressed against the sliding portions 14 and 15 of the inclined ring members 16 and 17, respectively. Rotates while sliding in the applied state.
The outer peripheral surface of the large-diameter rotating body 12 is difficult to form in a perfect circle shape. For this reason, the axis of each annular rail member 39 of the large-diameter rotating body 12 does not match, and rotates with inclination and vibration. The seal position sometimes deviated in the axial direction and the radial direction.
[0013]
For example, when the large-diameter rotating body 12 moves downstream with respect to the fixed member 13, the force with which the annular seal member 18 presses the sliding portion 14 becomes weak, but the annular seal member 19 presses the sliding portion 15. The power to do becomes stronger. In addition, when the large-diameter rotating body 12 moves upstream, the force of the annular seal member 18 is increased and the force of the annular seal member 19 is decreased. In this way, since the seal portion is provided in a double manner and the sliding portions 14 and 15 are arranged to face each other, the pressure in the seal portion is prevented from being lowered due to the movement of the large-diameter rotating body 12 in the axial direction. Therefore, even if the inside of the large-diameter rotating body 12 becomes a high pressure, it is possible to prevent the gas from being ejected from the seal portion to the outside.
Further, since the annular seal members 18 and 19 are sealed by bending the annular rubber plate 25, the annular seal members 18 and 19 are large even when the large-diameter rotating body 12 moves outward or in the radial direction. Sealing can be performed following the movement of the radial rotating body 12, and since the sealing portion is doubled, sealing can be ensured.
[0014]
Next, an airtight device 42 according to a modification will be described with reference to FIG. In addition, since the airtight apparatus 42 only added the greasing piping 45 to the airtight apparatus 10, the same number is attached | subjected to the member same as the airtight apparatus 10, and description is abbreviate | omitted.
Grease supply holes are formed at predetermined intervals in the circumferential direction in the sliding portions 14 and 15 of the inclined ring members 16 and 17. The front part of the greasing pipe 45 is attached to the back side of the sliding parts 14 and 15, respectively, and the base part side of the greasing pipe 45 is connected to a grease supply device or a supply container (not shown). The supply method may be manual or automatic using a compressor.
By comprising in this way, a lubrication agent can be continuously or intermittently supplied to the sliding parts 14 and 15 via the greasing pipe 45. And the frictional resistance at the time of sliding of the sliding parts 14 and 15 and the annular seal members 18 and 19 can be made small, and the lifetime of the annular seal members 18 and 19 can be lengthened.
[0015]
Subsequently, an airtight device 46 for a large-diameter rotating body according to a second embodiment will be described with reference to FIGS. 4 and 5.
The hermetic device 46 is a hermetic device that seals between the large-diameter rotating body 12 driven by a driving source and the fixing member 13 provided with a small gap around the large-diameter rotating body 12. The large-diameter rotating body airtight devices 10 and 11 according to the embodiment are provided at substantially the same position, and can be applied to the rotary kiln 29. Hereinafter, the case where the airtight device 46 is provided on the downstream side of the rotary kiln 29 will be described. In addition, the same number is attached | subjected to the member same as the already demonstrated member, and description is abbreviate | omitted.
The hermetic device 46 includes a sliding ring member 47 that is fixedly disposed on the outer periphery of the large-diameter rotating body 12 via a cylindrical flange portion and includes a sliding portion 53 that has been surface-treated in advance on its peripheral surface. An endless chain member 49 is slidably wound around the outer side of the ring member 47 in the radial direction.
[0016]
The sliding ring member 47 has an outer peripheral surface as a sliding portion 53. The endless chain member 49 includes a plate-shaped link plate 51 on both axial sides (upper and downstream sides) of a large number of rollers 50 provided in the circumferential direction of the sliding ring member 47 and an outer end portion in the axial direction. The link plates 52 each having an L-shaped cross section including attachment members extended on both sides are alternately connected to each other. At a predetermined position in the circumferential direction of the endless chain member 49, for example, tension means such as a coil spring is provided to urge the adjacent roller 50 in the direction of approaching.
The endless chain member 49 is covered with a tire-like rubber ring 54 which is an example of an elastic hollow annular member having an opening in the radial direction from the outside. Both end portions 55 and 56 forming the opening of the tire-like rubber ring 54 are arranged on the roller 50 with a slight gap on the downstream side. When both end portions 55 and 56 are in a free state, they are configured to protrude slightly inward in the radial direction from the inner end (same surface as the sliding portion 53) of the roller 50.
[0017]
The airtight device 46 includes an annular seal member 57 that performs sealing by connecting the fixing member 13 and the endless chain member 49. The two annular seal members 57 are provided with their outer end portions overlapped in the axial direction, and the overlapped outer end portions are attached to the fixing member 13 via the attachment ring member 21 and the annular attachment portion 20. The two annular seal members 57 sandwich the tire-like rubber ring 54 from both sides in the axial direction at the respective inner portions, and each inner end faces the lower side of both end portions 55 and 56 of the tire-like rubber ring 54. The sliding ring member 47 is disposed in sliding contact. Then, the inner portion of each annular seal member 57 is fastened and fixed to the attachment member of the link plate 52 using a bolt 58 and a nut 59 via the tire-like rubber ring 54.
Since the endless chain member 49 is connected to the fixing member 13 via the annular seal member 57 and the like, the endless chain member 49 main body remains in the circumferential direction even when the large-diameter rotating body 12 to which the sliding ring member 47 is fixed rotates. Without moving, the roller 50 only rotates while contacting the sliding ring member 47. The annular seal member 57 is urged radially inward by both end portions 55 and 56 of the tire-like rubber ring 54 having spring properties, and is pressed against the sliding portion 53 of the rotating sliding ring member 47.
[0018]
The inner part of the annular seal member 57 is attached to an endless chain member 49 provided with tension means, and both ends thereof are in contact with the sliding ring member 47, so that the large-diameter rotating body 12 has a radius due to eccentricity or the like. Even if it moves in the direction or axial direction, both ends of the annular seal member 57 can be moved along with the endless chain member 49, and the fluctuation of the pressing force applied to the sliding portion 53 of the sliding ring member 47 can be changed. Can be prevented. Further, since the end portions are provided at two positions on the downstream side of the roller 50, the seal can be formed in a double structure, and the pressure in the large-diameter rotating body 12 is rapidly increased and gas is ejected. This can be prevented.
Also in the present embodiment, it is possible to supply the lubricant to the sliding portion 53 continuously or intermittently via a greasing pipe (not shown).
[0019]
As mentioned above, although embodiment which concerns on this invention has been described, this invention is not limited to the said embodiment, For example, it is also possible to limit the attachment ring member 21 to a metal thing. is there. Since it is made of metal, the strength can be increased and the size of the annular seal member and the tension applied thereto can be reduced to prevent breakage.
Of the members described in the above embodiment, those formed in an annular shape (for example, the annular seal members 18 and 19 and the inclined ring members 16 and 17) can be divided into 2 to 8 and manufactured. is there. By dividing, each member can be manufactured at a low cost and can be easily replaced.
Moreover, although the connection of each member is comprised so that replacement | exchange and a maintenance can be performed easily using a volt | bolt and a nut, it is also possible to utilize other fixing means, such as welding. Moreover, the grease to be used can also be supplied from the annular seal member side.
[0020]
【The invention's effect】
In the airtight device for a large-diameter rotating body according to any one of claims 1 to 3, since it has an annular seal member that overlaps with a pair of sliding portions, the internal gas is externally generated when the seal portion is doubled and positive pressure is applied. Can be prevented from being ejected. In addition, since the sliding part is formed in a cross-sectional mountain shape, the pressing direction by the annular seal member can be distributed on both sides in the axial direction, and the sliding resistance applied to the large-diameter rotating body is made uniform, and the seal during operation Inclination and twisting of the member can be prevented.
In particular, in the airtight device for a large-diameter rotating body according to claim 2, since the annular seal member is configured by covering the plate-like elastic body with a seal material, the flexibility and wear resistance are improved, and the seal portion It is possible to stably apply a constant pressure to the plate, reduce wear due to sliding, and prevent heat from being directly transmitted to the plate-like elastic body, thereby extending the life of the annular seal member.
In the airtight device for the large-diameter rotating body according to the third aspect , since the lubricant is supplied, the sliding resistance can be reduced and the life of the annular seal member can be extended.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an airtight device according to a first embodiment of the present invention.
FIG. 2 is a sectional view of a rotary kiln to which the same hermetic device is applied.
FIG. 3 is a cross-sectional view of an airtight device according to a modification of the airtight device.
FIG. 4 is a cross-sectional view of an airtight device according to a second embodiment of the present invention.
FIG. 5 is a partially enlarged sectional view of the hermetic device.
FIG. 6 is a cross-sectional view of an airtight device according to a conventional example.
[Explanation of symbols]
10, 11: Airtight device, 12: Large-diameter rotating body, 13: Fixed member, 14, 15: Sliding part, 16, 17: Inclined ring member, 18, 19: Annular seal member, 20: Annular mounting part, 21 : Mounting ring member, 22: outer end, 23: bolt, 24: nut, 25: annular rubber plate (plate-like elastic body), 26: asbestos cloth (sealing material), 27: fixing plate, 28: asbestos yarn, 29: rotary kiln, 30: screw feeder, 31: burner, 32, 33: sprocket, 34, 35: driven roller, 36: refractory, 37: iron skin, 38: large-diameter sprocket, 39: annular rail member, 40, 41: mounting flange portion, 42: airtight device, 43: supply port, 44: discharge port, 45: grease supply pipe, 46: airtight device, 47: sliding ring member, 49: endless chain member, 5 : Roller, 51: link plate, 52: link plate (mounting member), 53: sliding portion, 54: tire-like rubber ring (elastic hollow annular member), 55, 56: end, 57: annular seal member, 58 : Bolt, 59: Nut

Claims (3)

駆動源によって駆動される大径回転体と、その周囲に少しの隙間を有して設けられた固定部材とのシールを行う気密装置であって、
前記大径回転体の外周に断面山形状に設けられ、対となって予め表面加工された摺動部を備えた傾斜リング部材と、
該傾斜リング部材の半径方向外側に位置し、前記固定部材に取付けリング部材を介して軸方向に重合して設けられ、それぞれの半径方向内側の端部を前記傾斜リング部材の各摺動部にそれぞれ押し当てる環状シール部材とを有することを特徴とする大径回転体の気密装置。
An airtight device that seals between a large-diameter rotating body driven by a driving source and a fixing member provided with a small gap around the rotating body,
An inclined ring member provided with a sliding portion that is provided in a cross-sectional mountain shape on the outer periphery of the large-diameter rotating body and is previously surface-treated as a pair;
Located on the outer side in the radial direction of the inclined ring member, the fixed member is provided by being overlapped in the axial direction via the attachment ring member, and the respective inner ends in the radial direction are provided on the sliding portions of the inclined ring member. An airtight device for a large-diameter rotating body having an annular seal member that presses each of the members.
請求項1記載の大径回転体の気密装置において、前記環状シール部材は、板状弾性体をシール材で覆って構成されることを特徴とする大径回転体の気密装置。  2. The airtight device for a large-diameter rotating body according to claim 1, wherein the annular seal member is configured by covering a plate-like elastic body with a sealing material. 請求項1及び2のいずれか1項に記載の大径回転体の気密装置において、前記摺動部には、給脂配管を介して潤滑剤が連続、又は断続的に供給されることを特徴とする大径回転体の気密装置。The airtight device for a large-diameter rotating body according to any one of claims 1 and 2 , wherein the lubricant is continuously or intermittently supplied to the sliding portion via a greasing pipe. An airtight device for large diameter rotating bodies.
JP33980399A 1999-11-30 1999-11-30 Airtight device for large diameter rotating body Expired - Fee Related JP4106168B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105115293A (en) * 2015-08-31 2015-12-02 中信重工机械股份有限公司 Rotary kiln sealing device high in air-tightness

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105115293A (en) * 2015-08-31 2015-12-02 中信重工机械股份有限公司 Rotary kiln sealing device high in air-tightness

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