JP2735577B2 - Shaft structure - Google Patents
Shaft structureInfo
- Publication number
- JP2735577B2 JP2735577B2 JP63234272A JP23427288A JP2735577B2 JP 2735577 B2 JP2735577 B2 JP 2735577B2 JP 63234272 A JP63234272 A JP 63234272A JP 23427288 A JP23427288 A JP 23427288A JP 2735577 B2 JP2735577 B2 JP 2735577B2
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- stirrer
- cylindrical shell
- welded
- wing
- 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.)
- Expired - Lifetime
Links
Landscapes
- Accessories For Mixers (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明の撹拌翼を具えた撹拌機に係り、特に、その軸
の信頼性を向上させるための改良に関する。Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to a stirrer having a stirring blade of the present invention, and more particularly to an improvement for improving the reliability of a shaft thereof.
［従来の技術］ 従来、撹拌機の軸は、一般に中実の単一材質が用いら
れている。撹拌機の軸は一般に一ヶ以上の翼を具えてお
り、翼は翼取付台を介して軸に取付けられるのである
が、翼取付台は軸に溶接により直接結合され、翼取付台
と翼は溶接、ボルト等により結合される。これを図で示
すと、撹拌機は、一般に円筒容器（不図示）内に第２図
のような撹拌翼が軸に取付けて配設される。第２図にお
いて、１は軸、２は翼取付台、３は翼を示す。翼３は翼
取付台２を介して軸１に取付けられるのであって、翼取
付台２は溶接により軸１に取付けられ、翼取付台２と翼
３は溶接又はボルトにより結合される。[Prior Art] Conventionally, a solid single material is generally used for a shaft of a stirrer. The shaft of the stirrer generally has one or more blades, and the blades are attached to the shaft through a blade mount. The blade mount is directly connected to the shaft by welding. Joined by welding, bolts, etc. As shown in the drawing, the stirrer is generally provided with a stirring blade as shown in FIG. 2 attached to a shaft in a cylindrical container (not shown). In FIG. 2, 1 is an axis, 2 is a wing mount, and 3 is a wing. The wing 3 is attached to the shaft 1 via the wing mount 2, and the wing mount 2 is attached to the shaft 1 by welding, and the wing mount 2 and the wing 3 are connected by welding or bolts.
腐食環境、高温環境下等で使用される撹拌機において
は、軸には一般にステンレス鋼が用いられるが、ある温
度以上で使用される場合、軸が有する残留応力、翼の取
付台の溶接による残留応力が使用中の温度、応力で緩和
され、軸が曲げ変形を生じることがある。曲げ変形を発
生すると回転振動が問題となり、信頼性は低下する。In a stirrer used in a corrosive environment, high-temperature environment, etc., stainless steel is generally used for the shaft, but when used at a certain temperature or higher, the residual stress of the shaft, the residual stress due to welding of the blade mounting base The stress may be relieved by the temperature and stress during use, and the shaft may be bent. When bending deformation occurs, rotational vibration becomes a problem, and reliability decreases.
他の従来例として、軸にライニング施工を行なって軸
を二重構造としたものがあり、これはライニング材を縦
割りの曲面板とし、軸と一体化のため軸方向、周方向と
も溶接施工を行なったものであるが、そのため、軸には
複雑で大きな残留応力が残存し、単一材の軸の場合と同
様、使用条件によっては軸が曲げ変形を生じる。As another conventional example, there is a case where a shaft is double-structured by performing lining work on the shaft, and the lining material is a vertically curved curved plate, and welding is performed in the axial direction and circumferential direction for integration with the shaft. However, as a result, complicated and large residual stress remains in the shaft, and the shaft is bent and deformed depending on the use conditions as in the case of the shaft made of a single material.
［発明が解決しようとする課題］ 上記のように従来技術による撹拌機では、温度等の使
用環境によっては、軸の曲げ変形が生じる等、信頼性が
著しく低下することがある。本発明の目的は、撹拌機に
おいて最も信頼性が要求される軸の信頼性を向上するこ
とにある。[Problems to be Solved by the Invention] As described above, in the stirrer according to the related art, depending on the use environment such as temperature, bending reliability of the shaft may be remarkably reduced, etc. An object of the present invention is to improve the reliability of a shaft that requires the highest reliability in a stirrer.
［課題を解決するための手段］ 前記目的を達成するため、本発明による撹拌機による
軸構造は、加工前に応力除去焼鈍が容易で、しかも容易
に残留応力が緩和される炭素鋼を軸材とする軸と、撹拌
翼と共に撹拌機使用環境に耐え、しかも前記軸に溶接可
能な材質のものであって、軸方向に相隔てられると共
に、前記軸に軸対称溶接された複数の翼取付台と、該翼
取付台と同様な材質のものであって、前記軸を包囲する
と共に、端部が前記翼取付台および前記軸に対して軸対
称溶接された複数の円筒殻とからなることを特徴とする
ものである。また、同じく、前記に加えて前記円筒殻
は、その周方向に一周する膨出部を有することを特徴と
するものである。[Means for Solving the Problems] In order to achieve the above object, a shaft structure using a stirrer according to the present invention is made of a carbon steel material in which stress relief annealing is easy before processing and residual stress is easily reduced. A plurality of blade mounts, which are made of a material which can withstand the use environment of the stirrer together with the shaft and the stirring blade, and which can be welded to the shaft, are separated in the axial direction, and are axially symmetrically welded to the shaft. And a plurality of cylindrical shells, which are made of the same material as the wing mount and surround the shaft, and whose ends are axisymmetrically welded to the wing mount and the shaft. It is a feature. In addition, similarly, in addition to the above, the cylindrical shell has a bulging portion that makes one round in the circumferential direction.
［作用］ 上記円筒殻を撹拌機使用環境に耐えるに適した材質の
ものとすることにより、軸が環境から保護される。円筒
殻の端部は、軸に軸対称溶接された翼取付台および軸に
対して軸対称溶接されているため、曲げ変形が生じにく
く、また残留応力も単純化、低減化される。円筒殻に周
方向に延びる膨出部を予め形成しておけば、軸と円筒殻
との熱膨張差を良好に吸収し得る。[Operation] The shaft is protected from the environment by using the cylindrical shell made of a material suitable for withstanding the use environment of the stirrer. Since the ends of the cylindrical shell are axisymmetrically welded to the blade and the blade mounting base that is axisymmetrically welded to the shaft, bending deformation is less likely to occur, and residual stress is simplified and reduced. If a bulging portion extending in the circumferential direction is formed in the cylindrical shell in advance, the difference in thermal expansion between the shaft and the cylindrical shell can be favorably absorbed.
［実 施 例］ 第１図は本発明の実施例による撹拌機の軸構造を示
す。第１図において１は軸、２は翼取付台、３は翼、４
は使用環境に対して好適な円筒殻である。本構造におい
て、軸方向に相隔てられた複数の翼取付台２は軸１に軸
対称溶接され、単位となる各円筒殻４の軸方向長さは、
翼取付台２の間の長さに見合うものとし、円筒殻４の端
部は、翼取付台２および軸１に対して軸対称溶接されて
いる。円筒殻４の端部のうち翼取付台２と直接隣接して
いない部分同士は互に溶接されると共に軸１に軸対称溶
接されている。FIG. 1 shows a shaft structure of a stirrer according to an embodiment of the present invention. In FIG. 1, 1 is an axis, 2 is a wing mount, 3 is a wing, 4
Is a cylindrical shell suitable for the use environment. In this structure, the plurality of blade mounts 2 spaced apart in the axial direction are welded axisymmetrically to the shaft 1, and the axial length of each cylindrical shell 4 as a unit is
The end of the cylindrical shell 4 is axisymmetrically welded to the wing mount 2 and the shaft 1 so as to match the length between the wing mounts 2. Portions of the ends of the cylindrical shell 4 that are not directly adjacent to the wing mount 2 are welded to each other and axially symmetric to the shaft 1.
本実施例では軸材１には一般の炭素鋼を用いた。軸材
として使用する炭素鋼は、加工前に応力除去焼鈍が容易
で、しかも容易に残留応力が緩和され、その後の円筒殻
４の溶接は、軸方向に一定間隔に位置するが軸対称溶接
であるため、曲げ変形は生じにくい。又、翼取付台２は
円筒殻４と結合されているため、応力が緩和されても、
軸の変形には殆ど寄与しない。In this embodiment, a general carbon steel is used for the shaft 1. The carbon steel used as the shaft material can be easily subjected to stress relieving annealing before processing, and the residual stress is easily relieved. Thereafter, the cylindrical shell 4 is welded at a certain interval in the axial direction, but by axially symmetric welding. Therefore, bending deformation is unlikely to occur. Further, since the wing mount 2 is connected to the cylindrical shell 4, even if the stress is relieved,
It hardly contributes to shaft deformation.
従来の軸のライニング構造では、軸方向に縦割りにし
た分割曲面板を円周方向および軸方向に溶接することに
より軸との一体化溶接を行なっていたが、しかし、この
構造では、軸に多種類の複雑で大きな残留応力が残存
し、しかも、多くの製作工数を必要とする。In the conventional shaft lining structure, integral curved welding was performed by welding a divided curved plate vertically divided in the axial direction in the circumferential direction and the axial direction. Many kinds of complicated and large residual stresses remain, and many man-hours are required.
これに対して、本発明実施例では、単位の円筒殻４の
端部を、軸に軸対称溶接された翼取付台および軸に対し
て軸対称溶接することで軸と一体化させるので、残留応
力が複雑にならず、製作工数も著しく削減できる。In contrast, in the embodiment of the present invention, the end of the cylindrical shell 4 of the unit is integrated with the shaft by performing axisymmetric welding on the shaft and the wing mounting base that is axisymmetrically welded on the shaft. The stress is not complicated, and the number of manufacturing steps can be significantly reduced.
本実施例において、撹拌機の存する構内温度が急激に
上昇する場合は、第３図に示すような軸本体と円筒殻と
の間で非定常的に温度差を生じる場合がある。すなわ
ち、第３図において、Ｂは軸の平均温度、Ａは円筒殻の
平均温度を示すが、昇温過程において両者間で温度差Δ
Ｔを生じることがある。この様な場合、あるいは、円筒
殻４の線膨張係数が軸１より大きい場合は、第４図に示
すように、円筒殻４は半径方向変形を生じようとする
が、円筒殻４の両端部のみが溶接および軸取付台により
拘束される。In this embodiment, when the temperature inside the premises where the stirrer is present rises rapidly, a temperature difference may occur unsteadily between the shaft body and the cylindrical shell as shown in FIG. That is, in FIG. 3, B represents the average temperature of the shaft, and A represents the average temperature of the cylindrical shell.
T may occur. In such a case or when the coefficient of linear expansion of the cylindrical shell 4 is larger than the axis 1, the cylindrical shell 4 tends to deform in the radial direction as shown in FIG. Only the weld and the shaft mount are restrained.
また、軸方向にも円筒殻には圧縮応力（又は引張応
力）を生じるが、これを軽減するには、第５図に示すよ
うに、円筒殻４に円周的に膨出部５を予め形成しておい
てベローの効果を与えることにより、応力を緩和するよ
うにすればよい。Further, compressive stress (or tensile stress) is generated in the cylindrical shell also in the axial direction. To reduce this, as shown in FIG. The stress may be alleviated by giving a bellows effect after forming.
［発明の効果］ 本発明によれば、撹拌機の槽内における腐食環境、高
温環境下等での使用に対し、それに好適な材質の円筒殻
の端部を、軸に軸対称溶接された翼取付台および軸に対
して軸対称溶接して軸表面に配設することにより、使用
中の温度、腐食、変動付加応力などによる残留応力緩和
が防止でき、軸の曲げ変形を防止することができる。[Effects of the Invention] According to the present invention, a blade in which the end of a cylindrical shell made of a material suitable for use in a corrosive environment or a high-temperature environment in a tank of a stirrer is axisymmetrically welded to an axis. By arranging the shaft symmetrically with respect to the mounting base and the shaft and disposing it on the shaft surface, it is possible to prevent residual stress relaxation due to temperature, corrosion, fluctuating added stress, etc. during use, and prevent bending deformation of the shaft. .
また、軸の外部に配設する円筒殻は、翼取付台間の長
さに見合って軸方向の単位長さを有するため、製作も容
易で、従来のライニング軸構造に対し大幅な工数低減、
コスト低減を図ることができる。In addition, since the cylindrical shell disposed outside the shaft has a unit length in the axial direction corresponding to the length between the blade mounts, it is easy to manufacture and greatly reduces the man-hour compared to the conventional lining shaft structure.
Cost can be reduced.
第１図は本発明の実施例による撹拌機構造の断面図、第
２図（ａ），（ｂ）は従来の撹拌機軸構造を示す正面図
および側面図、第３図は温度変化時の軸と円筒殻の温度
差を示す図、第４図は円筒殻の径方向変形を示す断面
図、第５図は円筒殻に膨出部を設けた実施例の断面図で
ある。 １……軸、２……翼取付台 ３……翼、４……円筒殻（ライニング） ５……膨出部FIG. 1 is a sectional view of a stirrer structure according to an embodiment of the present invention, FIGS. 2 (a) and 2 (b) are front and side views showing a conventional stirrer shaft structure, and FIG. FIG. 4 is a cross-sectional view showing a radial deformation of the cylindrical shell, and FIG. 5 is a cross-sectional view of an embodiment in which a bulging portion is provided on the cylindrical shell. DESCRIPTION OF SYMBOLS 1 ... Shaft 2 ... Wing mount 3 ... Wing 4 ... Cylindrical shell (lining) 5 ... Swelling part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中元 英和 茨城県土浦市神立町502番地 株式会社 日立製作所機械研究所内 (72)発明者 木下 高年 山口県下松市東豊井794番地 株式会社 日立製作所笠戸工場内 (72)発明者 石部 雅彦 山口県下松市東豊井794番地 株式会社 日立製作所笠戸工場内 (56)参考文献 実開 昭48−29473（ＪＰ，Ｕ) 実公 昭39−28675（ＪＰ，Ｙ１) 実公 昭45−24698（ＪＰ，Ｙ１) ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidekazu Nakamoto 502 Kandachicho, Tsuchiura-shi, Ibaraki Pref.Hitachi, Ltd.Mechanical Research Laboratory Co., Ltd. Inside the Todo factory (72) Inventor Masahiko Ishibe 794, Higashitoyoi, Kudamatsu-shi, Yamaguchi Prefecture Inside the Kasado factory, Hitachi, Ltd. (56) References: Shokai 48-29473 (JP, U) Y1) Jiko 45-4698 (JP, Y1)
Claims (2)
易に残留応力が緩和される炭素鋼を軸材とする軸と、撹
拌翼と共に撹拌機使用環境に耐え、しかも前記軸に溶接
可能な材質のものであって、軸方向に相隔てられると共
に、前記軸に軸対称溶接された複数の翼取付台と、該翼
取付台と同様な材質のものであって、前記軸を包囲する
と共に、端部が前記翼取付台および前記軸に対して軸対
称溶接された複数の円筒殻とからなることを特徴とする
撹拌機の軸構造。1. A shaft using carbon steel as a shaft material, in which stress relieving annealing is easy before processing and the residual stress is easily relieved, and a stirring blade together withstand the use environment of a stirrer, and can be welded to said shaft. And a plurality of wing mounts which are axially separated from each other and are axially symmetrically welded to the shaft, and are made of the same material as the wing mount, and surround the shaft. A shaft structure of the stirrer, wherein an end of the shaft structure comprises a plurality of cylindrical shells which are welded axisymmetrically with respect to the blade mounting base and the shaft.
部を有することを特徴とする請求項１記載の撹拌機の軸
構造。2. The shaft structure of a stirrer according to claim 1, wherein said cylindrical shell has a bulging portion which makes a round in a circumferential direction thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63234272A JP2735577B2 (en) | 1988-09-19 | 1988-09-19 | Shaft structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63234272A JP2735577B2 (en) | 1988-09-19 | 1988-09-19 | Shaft structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0283025A JPH0283025A (en) | 1990-03-23 |
| JP2735577B2 true JP2735577B2 (en) | 1998-04-02 |
Family
ID=16968368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63234272A Expired - Lifetime JP2735577B2 (en) | 1988-09-19 | 1988-09-19 | Shaft structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2735577B2 (en) |
-
1988
- 1988-09-19 JP JP63234272A patent/JP2735577B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0283025A (en) | 1990-03-23 |
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