JP4265040B2 - Multistage boom - Google Patents
Multistage boom Download PDFInfo
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- JP4265040B2 JP4265040B2 JP22925799A JP22925799A JP4265040B2 JP 4265040 B2 JP4265040 B2 JP 4265040B2 JP 22925799 A JP22925799 A JP 22925799A JP 22925799 A JP22925799 A JP 22925799A JP 4265040 B2 JP4265040 B2 JP 4265040B2
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- Prior art keywords
- boom
- bending
- multistage
- welding
- present
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Description
【０００１】
【発明の属する技術分野】
本発明は板材を長さ方向に沿って二箇所で直角に折り曲げ、その高さが左右で異なるように形成した部材（左右非対称の折り曲げ部材）を用いた多段式ブームに関するものである。
【０００２】
【従来の技術】
ブームを製作する方法としては、図６（ａ）、（ｂ）に示すように板材を２箇所で折り曲げて左右対称な部材とし、これを溶接する方法がある。
しかし図６（ｃ）に示すようにブームの縦の長さが横の長さよりかなり大きいものにおいては、通常の曲げ工具では角部を二度で曲げられず、図６（ｅ）、（ｆ）に示すように、板材の中心部を外から内へ曲げておいて角部を折り曲げ、その後、中央部を元に戻すという方法や、図６（ｄ）に示すように特殊な形状の曲げ工具を使用する必要がある。
そこでブームの縦横比が大きい場合には図７に示すように通常の曲げ工具を用いて左右の高さが異なるよう（左右非対称）に曲げ、その左右非対称部材を上下互い違いに組み合わせて溶接する方法が用いられることが多い。
【０００３】
【発明が解決しようとする課題】
しかし、このような左右非対称部材を用いた多段式ブームでは、溶接部が左右非対称となるので、溶接部の残留応力等によって稼働時に横曲がりやねじれが同方向に増幅されるおそれがある。
そこで本発明は、稼働時の左右の変位が大きくならないような多段式ブームを提供することを目的とする。
【０００４】
【課題を解決するための手段】
以上のような課題を解決するために、本発明は次のような多段式ブームを採用した。すなわち、請求項１記載の多段式ブームは、板材を長さ方向に沿って二箇所で直角に折り曲げ、その高さが左右で異なるように形成した部材を上下互い違いに組み合わせて溶接して形成した各ブームからなる多段式ブームであって、前記部材の左右一方の高さの高い方の部分が、基端ブームから先端ブームまで左右交互となるように配置されていることを特徴とするものである。
【０００５】
【作用】
本発明に係る多段式ブームにおいては、左右非対称の部分が基端部から先端部にかけて左右交互になるように配置されているので、溶接部の非対称性を打ち消し、溶接残留応力による横曲がりやねじれが大きくならない。なお、本明細書でいう「ブーム」は、「ジブ」をも含む広い意味のものである。
【０００６】
【発明の実施の形態】
本発明に係る多段式ブームについて、以下図面に基づいて説明する。
図１は、本発明に係るブームの一実施例を示す図である。図１に示すように各ブームは左右非対称の折り曲げ部材を溶接して製作されており（図１（ａ））、ブームの側面を形成する左右の長い方の部材が基端部から先端部まで左右交互になるように配置されている。
図１（ｂ）は、ブームを伸長させたときの斜視図であり、図１（ｃ）は、ブーム断面図である。これらの図からわかるように、左右の溶接位置の高低が交互になっていて左右の非対称性を打ち消すので、稼働時のブームの曲げやねじれによる左右の偏差が生じにくい。
【０００７】
次に他の実施例を図２に示す。図２に示す多段式ブームでは、左右非対称の折り曲げ部材からなるブームと左右対称の折り曲げ部材からなるブームとを組み合わせたものであり、左右非対称の折り曲げ部材からなる二つのブームにおいて、左右の長さの長い方の部材が左右交互になるように配置されている。
【０００８】
基端ブームに左右非対称の折り曲げ部材を用いた場合、左右非対称性から生じるブームの変位は、基端ブーム先端ではさほど大きくないが、その先の各ブームの長さが長いため、先端ブーム先端では、その変位が相当拡大されることになる。
すなわち、先端ブーム先端の変位を小さくするためには、特に基端部付近の左右非対称性を解消しておく必要がある。
このような考えを基にした他の実施例を図３に示す。このように、基端部とその次の二つのブームにおいて、左右非対称部分が交互になるようにしておき、それより先は左右非対称部分が交互にならないようにしておいてもよい。
【０００９】
ブームの下側には、稼働時に圧縮力がかかり挫屈するおそれがあるので、上側より強度を増す必要がある。そこで、図４に示すように左右非対称の折り曲げ部材の板厚を変化させ、上になる方を薄く、下になる方を厚くしてブームを形成してもよい。
また、ブームの断面形状は図５に示すように、矩形断面に限らず、矩形断面の角部を折り曲げたもの、角部を円弧状にしたもの、多角形断面のものでもよい。
【００１０】
【発明の効果】
本発明に係る多段式ブームにおいては、基端部から先端部にかけて折り曲げ部材の左右非対称部分の配置が左右交互になっているので、溶接部の非対称性が緩和され溶接の残留応力による横曲がりやねじれが増幅されず、稼働時におけるブーム先端位置のぶれが少ない。
【図面の簡単な説明】
【図１】本発明に係る多段式ブームの一実施例を示す図である。
【図２】本発明に係る多段式ブームの他の実施例を示す図である。
【図３】本発明に係る多段式ブームの他の実施例を示す図である。
【図４】板厚の異なる折り曲げ部材からなるブームを示す図である。
【図５】本発明に係る多段式ブームの断面形状を示す図である。
【図６】ブームを形成する板材を折り曲げる方法を示す図である。
【図７】板材を折り曲げて左右非対称な部材でブームを形成する方法を示す図である。
【符号の説明】
１ 板材
２ 溶接ビーム
１０ 曲げ工具[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multistage boom using a member ( asymmetrical bending member ) formed by bending a plate material at two right angles along the length direction and having different heights on the left and right.
[0002]
[Prior art]
As a method of manufacturing the boom, there is a method in which a plate material is bent at two locations to form a symmetrical member as shown in FIGS. 6A and 6B and welded.
However, in the case where the vertical length of the boom is considerably larger than the horizontal length as shown in FIG. 6 (c), the corner portion cannot be bent twice by a normal bending tool, and FIGS. As shown in FIG. 6 (d), the center portion of the plate material is bent from the outside to the inside, the corner portion is bent, and then the center portion is returned to the original position, or the bending of a special shape as shown in FIG. It is necessary to use a tool.
So if the aspect ratio of the boom is greater bending so that the height of the left and right are different (asymmetric) using conventional bending tool as shown in FIG. 7, a method of welding the asymmetrical member vertically alternately in combination Is often used.
[0003]
[Problems to be solved by the invention]
However, in such a multistage boom using a left / right asymmetric member, the welded portion is asymmetrical in the left / right direction, so that there is a risk that lateral bending and torsion are amplified in the same direction during operation due to residual stress in the welded portion and the like.
Therefore, an object of the present invention is to provide a multistage boom in which the left and right displacement during operation does not increase.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following multistage boom. That is, the multistage boom according to
[0005]
[Action]
In the multistage boom according to the present invention, the left and right asymmetrical portions are arranged so as to alternate from left to right from the base end portion to the distal end portion, so that the asymmetry of the welded portion is canceled, and lateral bending or twisting due to welding residual stress is caused. Does not grow. The “boom” in this specification has a broad meaning including “jib”.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
A multistage boom according to the present invention will be described below with reference to the drawings.
FIG. 1 is a view showing an embodiment of a boom according to the present invention. As shown in FIG. 1, each boom is manufactured by welding asymmetrical bending members (FIG. 1A), and the long left and right members forming the side of the boom are from the proximal end to the distal end. They are arranged so as to alternate left and right.
FIG. 1B is a perspective view when the boom is extended, and FIG. 1C is a cross-sectional view of the boom. As can be seen from these figures, since the left and right welding positions are alternated to cancel the left and right asymmetry, it is difficult for left and right deviations due to boom bending or twisting during operation.
[0007]
Another embodiment is shown in FIG. The multistage boom shown in FIG. 2 is a combination of a boom made up of a bilaterally asymmetric bending member and a boom made up of a bilaterally symmetrical bending member. The longer member is arranged so as to alternate left and right.
[0008]
When a bilaterally asymmetrical bending member is used for the proximal boom, the displacement of the boom resulting from the lateral asymmetry is not so large at the distal end of the proximal boom. The displacement is considerably enlarged.
That is, in order to reduce the displacement of the tip boom tip, it is necessary to eliminate the left-right asymmetry particularly near the base end.
Another embodiment based on this idea is shown in FIG. As described above, the left and right asymmetric portions may be alternated between the base end portion and the next two booms, and the left and right asymmetric portions may not be alternated thereafter.
[0009]
Since the lower side of the boom may be cramped due to a compressive force during operation, it is necessary to increase the strength from the upper side. Therefore, as shown in FIG. 4, the boom may be formed by changing the plate thickness of the asymmetrical bending member so that the upper side is thinner and the lower side is thicker.
Moreover, as shown in FIG. 5, the cross-sectional shape of the boom is not limited to a rectangular cross section, but may be a bent cross section of a rectangular cross section, an arc shape of a corner, or a polygonal cross section.
[0010]
【The invention's effect】
In the multistage boom according to the present invention, the arrangement of the left and right asymmetric parts of the bending member is alternately left and right from the base end part to the front end part, so that the asymmetry of the welded part is relaxed and the lateral bending due to the residual stress of welding is reduced. Twist is not amplified, and there is little fluctuation of the boom tip position during operation.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a multistage boom according to the present invention.
FIG. 2 is a view showing another embodiment of the multistage boom according to the present invention.
FIG. 3 is a view showing another embodiment of the multistage boom according to the present invention.
FIG. 4 is a view showing a boom made of bending members having different plate thicknesses.
FIG. 5 is a diagram showing a cross-sectional shape of a multistage boom according to the present invention.
FIG. 6 is a diagram showing a method of bending a plate material forming a boom.
FIG. 7 is a view showing a method of forming a boom with a bilaterally asymmetric member by bending a plate material.
[Explanation of symbols]
1 Plate material 2
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22925799A JP4265040B2 (en) | 1999-08-13 | 1999-08-13 | Multistage boom |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22925799A JP4265040B2 (en) | 1999-08-13 | 1999-08-13 | Multistage boom |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001048475A JP2001048475A (en) | 2001-02-20 |
| JP4265040B2 true JP4265040B2 (en) | 2009-05-20 |
Family
ID=16889288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22925799A Expired - Fee Related JP4265040B2 (en) | 1999-08-13 | 1999-08-13 | Multistage boom |
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| Country | Link |
|---|---|
| JP (1) | JP4265040B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030274A (en) * | 2010-05-24 | 2011-04-27 | 韶关市起重机厂有限责任公司 | Jib arm structure of lorry-mounted crane |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10211481A1 (en) * | 2002-03-15 | 2003-10-02 | Teupen Maschbau Gmbh | Self-propelled work vehicle |
| CN103318782B (en) * | 2013-06-07 | 2015-03-18 | 三一汽车起重机械有限公司 | Boom main arm composite structure, crane, and boom main arm composition method |
| WO2017065066A1 (en) * | 2015-10-13 | 2017-04-20 | 株式会社タダノ | Work machine boom |
| CN109854169A (en) * | 2018-12-29 | 2019-06-07 | 中国铁建重工集团有限公司 | A kind of drill boom and the drill jumbo comprising it |
-
1999
- 1999-08-13 JP JP22925799A patent/JP4265040B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030274A (en) * | 2010-05-24 | 2011-04-27 | 韶关市起重机厂有限责任公司 | Jib arm structure of lorry-mounted crane |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001048475A (en) | 2001-02-20 |
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