JPH07239040A - Device for sealing rotating shaft - Google Patents
Device for sealing rotating shaftInfo
- Publication number
- JPH07239040A JPH07239040A JP6055236A JP5523694A JPH07239040A JP H07239040 A JPH07239040 A JP H07239040A JP 6055236 A JP6055236 A JP 6055236A JP 5523694 A JP5523694 A JP 5523694A JP H07239040 A JPH07239040 A JP H07239040A
- Authority
- JP
- Japan
- Prior art keywords
- sealing device
- rotating shaft
- rotary shaft
- contact
- elastic seal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Sealing Of Bearings (AREA)
- Sealing With Elastic Sealing Lips (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、工作機械や、その他
種々の産業機械における回転軸のシール一般に適用さ
れ、特に立型で用いられる回転軸に好適に使用可能な回
転軸の密封装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to rotary shaft sealing in machine tools and various other industrial machines, and more particularly to a rotary shaft sealing device which can be suitably used for a rotary shaft used in a vertical shape.
【０００２】[0002]
【従来の技術】最近の工作機械の主軸では、生産性向上
のために高速化の傾向にあり、主軸軸受の潤滑もエアオ
イル、ジェット潤滑等の油を使用するものが多くなって
来ている。その場合、軸受のオイル漏れ防止や塵埃の侵
入阻止のために、ハウジングの主軸突出部にシールが施
される。このシールとして、接触型のものを使用すれば
確実な油漏れが防げるが、高速回転する回転軸のシール
では、接触シールは発熱が大きくて好ましくない。その
ため、従来はラビリンスシールを使用しているが、高速
回転時はシール性が良好であっても、低速時や停止時は
効果が少ない。これを補うために、圧縮空気を用いたエ
アシールが併用されている。2. Description of the Related Art In recent spindles of machine tools, there is a tendency toward higher speeds in order to improve productivity, and the lubrication of spindle bearings is increasingly using oil such as air oil and jet lubrication. In that case, in order to prevent oil leakage of the bearing and prevent invasion of dust, a seal is provided on the main shaft protrusion of the housing. If a contact type seal is used as this seal, reliable oil leakage can be prevented, but a seal of a rotating shaft rotating at a high speed is not preferable because the contact seal generates a large amount of heat. Therefore, a labyrinth seal has been conventionally used, but even if the sealability is good at high speed rotation, it is less effective at low speed or at stop. To compensate for this, an air seal using compressed air is also used.
【０００３】図３は、従来のラビリンス構造の一例で、
エアシールを併用したものである。回転軸５１は、工具
が下端に装着される立型の主軸であり、ハウジング５２
に軸受５３を介して支持されている。軸受５３の下方に
ラビリンスシール５４が設けられ、その下方において、
ハウジング５２の内周面に圧縮空気の供給路５５と、環
状吹出し溝５６とが設けてある。この構成によると、供
給路５５から吐出された圧縮空気が環状吹出し溝５６か
ら回転軸５１の全周に流れて軸方向に吹き出すことによ
り、回転軸５１の低速時や停止時のシールが得られる。FIG. 3 shows an example of a conventional labyrinth structure.
It also uses an air seal. The rotary shaft 51 is a vertical main shaft on which a tool is attached to the lower end, and
Are supported by bearings 53. A labyrinth seal 54 is provided below the bearing 53, and below that,
A supply passage 55 for compressed air and an annular blowing groove 56 are provided on the inner peripheral surface of the housing 52. According to this configuration, the compressed air discharged from the supply passage 55 flows from the annular blow-out groove 56 to the entire circumference of the rotary shaft 51 and blows out in the axial direction, so that a seal can be obtained when the rotary shaft 51 is low speed or stopped. .
【０００４】図４は従来の他の密封装置の提案例であ
り、オイルシール５８とエアシール５９とを併用したも
のである。停止時には上部に取り付けられたオイルシー
ル５８により密封し、回転中にはスライド部材６０によ
りオイルシール５８のリップ部５８ａを開放し、エアシ
ール５９により密封する。このように回転中にリップ部
５８ａを非接触状態とするため、接触摩擦による発熱も
なく、駆動動力も小さくて済む。FIG. 4 is a proposal example of another conventional sealing device, in which an oil seal 58 and an air seal 59 are used together. When stopped, the oil seal 58 mounted on the upper portion seals the oil seal 58. During rotation, the slide member 60 opens the lip portion 58a of the oil seal 58 and the air seal 59 seals. Since the lip portion 58a is brought into a non-contact state during the rotation as described above, heat generation due to contact friction does not occur and driving power can be small.
【０００５】[0005]
【発明が解決しようとする課題】図３の立型の回転軸５
１において、軸受５３にジェット潤滑やアンダーレース
潤滑を行った場合には、軸受５３におけるオイル量が多
く、オイルの流下も生じ易いため、オイル漏れの問題が
考えられる。しかも、エアシールでは停止中も圧縮空気
の供給を続ける必要があり、空気使用量が多くなるとい
う問題点がある。停止中に圧縮空気の供給を止めると、
ラビリンスシール５４よりも下の部分にあった油が主軸
を伝って流出することになる。The vertical rotary shaft 5 shown in FIG.
In No. 1, when the bearing 53 is subjected to jet lubrication or underlace lubrication, the amount of oil in the bearing 53 is large and oil may easily flow down, which may cause a problem of oil leakage. Moreover, in the air seal, it is necessary to continue the supply of compressed air even when the air seal is stopped, and there is a problem that the amount of air used increases. If the supply of compressed air is stopped while stopped,
The oil located below the labyrinth seal 54 will flow out along the main shaft.
【０００６】図４の例では、停止中はオイルシール５８
で密封する構造であるため、上記の問題点は解消される
が、装置が大きくなり、部品点数も多くなる。すなわ
ち、運転中にシールリップ５８ａをピストン６０で押し
て非接触にするには、ピストン６０のストロークを大き
くすることが必要で、シールのための構成スペースが大
きくなってしまう。また、高価な部品であるオイルシー
ル５８の使用により、コスト高になる。In the example of FIG. 4, the oil seal 58 is in operation during stoppage.
Since the structure is hermetically sealed, the above problems are solved, but the device becomes large and the number of parts also increases. That is, in order to push the seal lip 58a by the piston 60 to make it non-contact during operation, it is necessary to increase the stroke of the piston 60, and the construction space for sealing becomes large. In addition, the use of the oil seal 58, which is an expensive component, increases the cost.
【０００７】この発明の目的は、装置をコンパクト化
し、部品点数を減らし、低コストで停止時のシール性能
の向上が図れ、かつ高速回転の障害とならない回転軸の
密封装置を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary shaft sealing device which is compact in size, has a reduced number of parts, can be improved in sealing performance at a low cost, and which does not hinder high-speed rotation. .
【０００８】[0008]
【課題を解決するための手段】この発明の密封装置は、
直軸部から次第に窄まるテーパ部を有する回転軸に適用
される。この回転軸の直軸部に接触しかつテーパ部に対
して非接触となる内径の弾性シールリングを設け、この
弾性シールリングをスライド部材に保持させて前記直軸
部とテーパ部との間に流体圧アクチュエータで移動させ
るようにする。流体圧アクチュエータは、スライド部材
を軸方向移動自在に支持した密封装置本体に内蔵する。
また、密封装置本体と回転軸との間の隙間に圧縮気体を
供給するエアシール装置を設ける。The sealing device of the present invention comprises:
It is applied to a rotary shaft having a tapered portion that gradually narrows from a straight shaft portion. An elastic seal ring having an inner diameter that is in contact with the straight shaft portion of the rotating shaft and is not in contact with the tapered portion is provided, and the elastic seal ring is held by the slide member so as to be provided between the straight shaft portion and the tapered portion. Move with a fluid pressure actuator. The fluid pressure actuator is built in the sealing device body that supports the slide member so as to be movable in the axial direction.
Further, an air seal device for supplying compressed gas is provided in the gap between the sealing device body and the rotary shaft.
【０００９】[0009]
【作用】回転軸が停止している間は、弾性シールリング
を直軸部に位置させて接触状態とし、油漏れを防ぐ。回
転中は、流体圧アクチュエータでスライド部材と共に弾
性シール部材を回転軸のテーパ部に移動させることよ
り、回転軸に対して非接触とし、かつエアシール装置か
らの噴出気体によるエアシールで油漏れを防ぐ。When the rotary shaft is stopped, the elastic seal ring is positioned on the straight shaft portion so as to be in contact therewith to prevent oil leakage. During rotation, the fluid pressure actuator moves the elastic seal member together with the slide member to the taper portion of the rotary shaft so that the elastic seal member is not in contact with the rotary shaft and the oil leak is prevented by the air seal caused by the gas ejected from the air seal device.
【００１０】[0010]
【実施例】この発明の一実施例を図１および図２に基づ
いて説明する。図１はマシニングセンタ等の工作機械に
おける主軸頭の先端部の断面を示す。回転軸１は、下端
に工具が装着される立型の主軸であり、軸受２を介して
ハウジング３に支持されている。回転軸１の下端の外径
面は、直軸部１ａと、この直軸部１ａから続いて先窄ま
りとなるテーパ部１ｂとに形成されている。前記ハウジ
ング３の下端にこの密封装置５が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a cross section of a tip portion of a spindle head in a machine tool such as a machining center. The rotating shaft 1 is a vertical main shaft having a tool attached to the lower end thereof, and is supported by the housing 3 via a bearing 2. The outer diameter surface of the lower end of the rotating shaft 1 is formed into a straight shaft portion 1a and a tapered portion 1b which is tapered from the straight shaft portion 1a. The sealing device 5 is provided at the lower end of the housing 3.
【００１１】この密封装置５は、弾性シールリング６、
スライド部材７、密封装置本体８、流体圧アクチュエー
タ９、およびエアシール装置１０等で構成される。弾性
シールリング６はＯリング等からなり、回転軸１の直軸
部１ａに接触してテーパ部１ｂに対して非接触となる内
径に形成されている。スライド部材７は、流体圧アクチ
ュエータ９のピストン部７ａを外径部に有するリング状
のものであり、内径面に形成した環状溝に前記弾性シー
ルリング６を嵌合させてある。The sealing device 5 includes an elastic seal ring 6,
It is composed of a slide member 7, a sealing device body 8, a fluid pressure actuator 9, an air seal device 10, and the like. The elastic seal ring 6 is composed of an O-ring or the like, and has an inner diameter that comes into contact with the straight shaft portion 1a of the rotary shaft 1 and does not come into contact with the tapered portion 1b. The slide member 7 is a ring-shaped member having a piston portion 7a of the fluid pressure actuator 9 on the outer diameter portion, and the elastic seal ring 6 is fitted in an annular groove formed on the inner diameter surface.
【００１２】密封装置本体８は、３個のリング部材１１
〜１３を組み立てたものであり、内部に流体圧アクチュ
エータ９の前記ピストン部７ａを軸方向移動自在に嵌合
させるリング状の流体圧室９ａが形成される。流体圧室
９ａにはリング部材１１の外径面に開口した流体供給路
１７が開通させてある。スライド部材７は、上下のリン
グ状部材１１，１３の間で軸方向移動が可能であり、ピ
ストン部７ａの周方向複数箇所に形成した各ばね収容孔
１８内に、圧縮コイルばねからなる復帰ばね１４が収容
してある。The sealing device body 8 comprises three ring members 11
13 to 13 are assembled, and a ring-shaped fluid pressure chamber 9a into which the piston portion 7a of the fluid pressure actuator 9 is fitted so as to be movable in the axial direction is formed inside. The fluid pressure chamber 9a has a fluid supply path 17 opened to the outer diameter surface of the ring member 11. The slide member 7 is movable in the axial direction between the upper and lower ring-shaped members 11 and 13, and is a return spring formed of a compression coil spring in each spring accommodating hole 18 formed at a plurality of circumferential positions of the piston portion 7a. 14 are housed.
【００１３】密封装置本体８の上側のリング部材１１の
内径、およびスライド部材７の内径は、回転軸１の直軸
部１ａの外周に若干の隙間を介して遊嵌する径に形成さ
れている。下側のリング部材１３は、回転軸１のテーパ
部１ｂの軸方向位置にあり、その内径面はテーパ部１ｂ
と平行なテーパ面で、かつテーパ部１ｂに若干の隙間を
介して遊嵌する内径に形成されている。この下側リング
部材１３の内径面には、環状吹出し溝１５が形成され、
中間リング部材１２の外径面に開通した流体供給路１６
が溝底面に開口している。これら流体供給路１６と環状
吹出し溝１５等でエアシール装置１０が構成される。The inner diameter of the ring member 11 on the upper side of the sealing device main body 8 and the inner diameter of the slide member 7 are formed so as to be loosely fitted to the outer periphery of the straight shaft portion 1a of the rotary shaft 1 with a slight gap. . The lower ring member 13 is located at the axial position of the tapered portion 1b of the rotary shaft 1, and the inner diameter surface of the lower ring member 13 is the tapered portion 1b.
It has a tapered surface parallel to and has an inner diameter that fits loosely in the tapered portion 1b with a slight gap. An annular blowing groove 15 is formed on the inner diameter surface of the lower ring member 13,
Fluid supply channel 16 opened to the outer diameter surface of the intermediate ring member 12
Is open at the bottom of the groove. The air seal device 10 is constituted by the fluid supply passage 16 and the annular blowing groove 15.
【００１４】上記構成の動作を説明する。休止中（機械
の運転をしないとき）など、回転軸１を停止させている
間は、各流体供給経路１６，１７には作動流体を供給せ
ず、復帰ばね１４の付勢でスライド部材７を上昇位置に
位置させておく。これにより、図１のように弾性シール
リング６は回転軸１の直軸部１ａに接触して密封装置本
体８との間の隙間を密封する。このように接触シールと
することにより、オイル漏れや塵埃の侵入が確実に阻止
される。回転時は、図２のようにリング部材１１の流体
供給路１７から作動流体として例えば圧縮空気を供給
し、スライド部材７を下方に移動させる。これにより、
弾性シールリング６は回転軸１のテーパ部１ｂに移動
し、非接触となる。同時に、別の流体供給路１６から圧
縮空気を供給し、内径面の環状吹出し溝１５から吹き出
させる。吹き出し空気は、回転軸１の全周で軸方向に吹
き出し、これにより密封装置本体８と回転軸１との間の
隙間がシールされ、油漏れが防止される。The operation of the above configuration will be described. While the rotary shaft 1 is stopped, such as during rest (when the machine is not operating), the working fluid is not supplied to the fluid supply paths 16 and 17, and the slide member 7 is urged by the return spring 14 to urge the fluid. Keep it in the raised position. As a result, as shown in FIG. 1, the elastic seal ring 6 comes into contact with the straight shaft portion 1 a of the rotary shaft 1 to seal the gap between the elastic seal ring 6 and the sealing device body 8. By using the contact seal as described above, oil leakage and intrusion of dust are reliably prevented. During rotation, compressed air, for example, is supplied as a working fluid from the fluid supply passage 17 of the ring member 11 as shown in FIG. 2, and the slide member 7 is moved downward. This allows
The elastic seal ring 6 moves to the taper portion 1b of the rotary shaft 1 and becomes non-contact. At the same time, compressed air is supplied from another fluid supply passage 16 and blown out from the annular blow-out groove 15 on the inner diameter surface. The blown air is blown in the axial direction around the entire circumference of the rotary shaft 1, whereby the gap between the sealing device body 8 and the rotary shaft 1 is sealed, and oil leakage is prevented.
【００１５】この密封装置５によると、このように流体
圧の供給により、自在に弾性シールリング６を回転軸１
に接触させたり、離したりすることができ、停止中のシ
ール性確保と、回転時のトルク損失および発熱が防止で
きる。また、弾性シールリング６は回転軸１の直軸部１
ａとテーパ部１ｂとの間に移動させて接触状態と非接触
状態とに切り換えるため、移動距離が短くて済み、しか
も構成が簡単で部品点数も少なく、コンパクトにするこ
とができる。流体圧アクチュエータ９が密封装置本体８
内に構成されていることからも、装置がコンパクト化さ
れ、構成がより簡単なものとなる。さらに、この密封装
置５によると、全ての部品を一つにまとめたユニットに
構成でき、各種機器への設置や取扱に便利である。According to the sealing device 5, the elastic seal ring 6 is freely attached to the rotary shaft 1 by the fluid pressure thus supplied.
Can be contacted with or separated from, and it is possible to secure the sealing performance during stoppage and prevent torque loss and heat generation during rotation. Further, the elastic seal ring 6 is the straight shaft portion 1 of the rotary shaft 1.
Since the contact state and the non-contact state are switched by moving between a and the taper portion 1b, the movement distance is short, the configuration is simple, the number of parts is small, and the device can be made compact. The fluid pressure actuator 9 is the sealing device body 8
The internal structure also makes the device compact and makes the structure simpler. Furthermore, according to the sealing device 5, all the parts can be configured as a unit, which is convenient for installation and handling in various devices.
【００１６】なお、前記実施例ではスライド部材７の駆
動用の流体供給路１７と、エアシール用の流体供給路１
６とを別々に設けたが、両者１４，１６を連通させて１
か所で圧縮空気の供給を行うようにしても良い。また、
駆動用およびシール用の流体は、使用条件によっては、
空気に限らず、各種の気体を使用することもできる。密
封装置本体８は、ハウジング３の一部からなるものとし
ても良い。In the above embodiment, the fluid supply passage 17 for driving the slide member 7 and the fluid supply passage 1 for air seal are used.
6 and 6 are provided separately, but both 14 and 16 are connected to each other to
The compressed air may be supplied at some places. Also,
Depending on the operating conditions, the driving and sealing fluids may
Not only air but also various gases can be used. The sealing device body 8 may be a part of the housing 3.
【００１７】[0017]
【発明の効果】この発明の回転軸の密封装置は、弾性シ
ールリングを回転軸の直軸部とテーパ部との間に移動さ
せて接触状態と非接触状態とに切り換えるようにしたの
で、弾性シールリングと共に移動するスライド部材の移
動距離が短くて済み、また構成が簡単で部品点数も少な
く、コンパクトにすることができる。また、停止時は弾
性シールリングによる接触シール、回転時はエアシール
となるため、トルク損失や発熱を防止し、停止中から高
速回転までシール性を確保できる。According to the rotary shaft sealing device of the present invention, the elastic seal ring is moved between the straight shaft portion and the taper portion of the rotary shaft to switch between the contact state and the non-contact state. The slide member, which moves together with the seal ring, needs only a short moving distance, has a simple structure, has a small number of parts, and can be made compact. Further, since the contact seal is made by the elastic seal ring at the time of stop and the air seal is made at the time of rotation, torque loss and heat generation can be prevented, and the sealing performance can be secured from the time of stop to high speed rotation.
【図１】この発明の一実施例にかかる回転軸の密封装置
を応用した工作機械の部分断面図である。FIG. 1 is a partial cross-sectional view of a machine tool to which a rotary shaft sealing device according to an embodiment of the present invention is applied.
【図２】その異なる動作状態を示す部分拡大図である。FIG. 2 is a partially enlarged view showing the different operation state.
【図３】従来例の断面図である。FIG. 3 is a sectional view of a conventional example.
【図４】他の従来例の断面図である。FIG. 4 is a sectional view of another conventional example.
１…回転軸、１ａ…直軸部、１ｂ…テーパ部、２…軸
受、３…ハウジング、５…密封装置、６…弾性シールリ
ング、７…スライド部材、７ａ…ピストン部、８…密封
装置本体、９…流体圧アクチュエータ、９ａ…流体圧
室、１０…エアシール装置、１４…復帰ばね、１６，１
７…流体供給路DESCRIPTION OF SYMBOLS 1 ... Rotating shaft, 1a ... Straight shaft part, 1b ... Tapered part, 2 ... Bearing, 3 ... Housing, 5 ... Sealing device, 6 ... Elastic seal ring, 7 ... Sliding member, 7a ... Piston part, 8 ... Sealing device main body , 9 ... Fluid pressure actuator, 9a ... Fluid pressure chamber, 10 ... Air seal device, 14 ... Return spring, 16, 1
7 ... Fluid supply path
Claims (1)
記回転軸の直軸部に接触し、かつ前記回転軸の前記直軸
部から次第に窄まるテーパ部に対して非接触となる内径
の弾性シールリングと、前記密封装置本体に軸方向移動
自在に支持されて前記弾性シールリングを保持し、この
弾性シールリングを前記直軸部とテーパ部との間に移動
させるリング状のスライド部材と、前記密封装置本体内
に設けられて前記スライド部材を軸方向に移動させる流
体圧アクチュエータと、前記密封装置本体と前記回転軸
との間の隙間に圧縮気体を供給するエアシール装置とを
備えた回転軸の密封装置。1. A main body of a sealing device which penetrates a rotary shaft, and an inner diameter which is in contact with a straight shaft portion of the rotary shaft and which is not in contact with a tapered portion of the rotary shaft which gradually narrows from the straight shaft portion. And an elastic seal ring that is axially movably supported by the main body of the sealing device, holds the elastic seal ring, and moves the elastic seal ring between the straight shaft portion and the tapered portion. And a fluid pressure actuator that is provided in the sealing device body to move the slide member in the axial direction, and an air seal device that supplies compressed gas to a gap between the sealing device body and the rotating shaft. Sealing device for rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6055236A JPH07239040A (en) | 1994-02-28 | 1994-02-28 | Device for sealing rotating shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6055236A JPH07239040A (en) | 1994-02-28 | 1994-02-28 | Device for sealing rotating shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07239040A true JPH07239040A (en) | 1995-09-12 |
Family
ID=12992979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6055236A Pending JPH07239040A (en) | 1994-02-28 | 1994-02-28 | Device for sealing rotating shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07239040A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279339A (en) * | 2013-07-11 | 2015-01-14 | 发那科株式会社 | Machine tool |
| CN104565368A (en) * | 2015-01-12 | 2015-04-29 | 大连华阳密封股份有限公司 | Parking seal device for top stirrer and seal method thereof |
| CN104712765A (en) * | 2015-03-12 | 2015-06-17 | 湖南中天龙舟农机有限公司 | Agricultural machinery rotating wheel pre-compression elastic rotary seal device |
| CN108644386A (en) * | 2018-05-29 | 2018-10-12 | 哈尔滨联科包装机械有限公司 | Rotary shaft sealing gland ring type sealing device and encapsulating method |
| CN110914002A (en) * | 2018-06-13 | 2020-03-24 | 诺维尔里斯公司 | System and method for cooling rolls in metal processing |
| CN112343924A (en) * | 2020-10-29 | 2021-02-09 | 广州市昊志机电股份有限公司 | Main shaft contact type sealing structure, main shaft and machine tool |
| US10953447B2 (en) | 2018-06-13 | 2021-03-23 | Novelis Inc. | Systems and methods for containing viscous materials in roll processing |
-
1994
- 1994-02-28 JP JP6055236A patent/JPH07239040A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279339A (en) * | 2013-07-11 | 2015-01-14 | 发那科株式会社 | Machine tool |
| US9709170B2 (en) | 2013-07-11 | 2017-07-18 | Fanuc Corporation | Machine tool including sealing structure in rotation unit |
| CN104565368A (en) * | 2015-01-12 | 2015-04-29 | 大连华阳密封股份有限公司 | Parking seal device for top stirrer and seal method thereof |
| CN104712765A (en) * | 2015-03-12 | 2015-06-17 | 湖南中天龙舟农机有限公司 | Agricultural machinery rotating wheel pre-compression elastic rotary seal device |
| CN108644386A (en) * | 2018-05-29 | 2018-10-12 | 哈尔滨联科包装机械有限公司 | Rotary shaft sealing gland ring type sealing device and encapsulating method |
| CN110914002A (en) * | 2018-06-13 | 2020-03-24 | 诺维尔里斯公司 | System and method for cooling rolls in metal processing |
| US10814365B2 (en) | 2018-06-13 | 2020-10-27 | Novelis Inc. | Systems and methods for cooling a roll in metal processing |
| US10953447B2 (en) | 2018-06-13 | 2021-03-23 | Novelis Inc. | Systems and methods for containing viscous materials in roll processing |
| CN110914002B (en) * | 2018-06-13 | 2022-04-29 | 诺维尔里斯公司 | System and method for cooling rolls in metal processing |
| CN112343924A (en) * | 2020-10-29 | 2021-02-09 | 广州市昊志机电股份有限公司 | Main shaft contact type sealing structure, main shaft and machine tool |
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