JP2007291670A - Work arm of work machine - Google Patents

Work arm of work machine Download PDF

Info

Publication number
JP2007291670A
JP2007291670A JP2006119103A JP2006119103A JP2007291670A JP 2007291670 A JP2007291670 A JP 2007291670A JP 2006119103 A JP2006119103 A JP 2006119103A JP 2006119103 A JP2006119103 A JP 2006119103A JP 2007291670 A JP2007291670 A JP 2007291670A
Authority
JP
Japan
Prior art keywords
side plates
arm
working
boom
plates
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
Application number
JP2006119103A
Other languages
Japanese (ja)
Inventor
Takayuki Yuasa
孝之 湯浅
Yasunori Komatsubara
靖則 小松原
Masaya Yorifuji
雅也 依藤
Eiji Akabane
英司 赤羽根
Akiyasu Yamada
晃廉 山田
Tomomi Imatani
智美 今谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Japan Ltd
Caterpillar Mitsubishi Ltd
Original Assignee
Caterpillar Mitsubishi Ltd
Shin Caterpillar Mitsubishi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Caterpillar Mitsubishi Ltd, Shin Caterpillar Mitsubishi Ltd filed Critical Caterpillar Mitsubishi Ltd
Priority to JP2006119103A priority Critical patent/JP2007291670A/en
Publication of JP2007291670A publication Critical patent/JP2007291670A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Body Structure For Vehicles (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To increase the strength of a boom 8 of a hydraulic shovel without producing welding distortion therearound. <P>SOLUTION: A cylindrical reinforcement plate 17 is so assembled into holes 13a and 14a so formed in the left and right side surface plates 12, 13 of the boom 8 as to face each other that both the left and right ends thereof are projected from the left and right side surface plates 13, 14 to the left and right outer sides. The projecting parts 17a of the reinforcement plate 7 and the left and right side surface plates 13, 14 are formed integrally with each other by the welding 20 by fillet welding. Since a cylindrical through hole X is so formed that a cylindrical wall is present all around the cylindrical hole, the boom 8 can be reinforced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、油圧ショベルのフロントアタッチメントとして装備されるブームのように中空断面を有して形成される作業機械における作業腕の技術分野に属するものである。   The present invention belongs to the technical field of working arms in a working machine formed with a hollow cross section like a boom equipped as a front attachment of a hydraulic excavator.

一般に、作業機械のなかには中空断面を有する作業腕を設けたものがあり、このような作業腕として油圧ショベルのブームが代表的なものとして例示され、以下、このブームを例にして説明する。このようなブームは、上下面板と左右側面板とで中空断面を有した箱型形状に形成されているが、剛性を維持する必要があり、そこで箱型内部に補強板を設けることが試みられている（例えば特許文献１、２参照）。
特開２０００−２４８５７３号公報 特開２００２−２４２２２７号公報 In general, some work machines are provided with a work arm having a hollow cross section. A typical example of such a work arm is a boom of a hydraulic excavator. Hereinafter, the boom will be described as an example. Such a boom is formed in a box shape having a hollow cross section between the upper and lower side plates and the left and right side plates, but it is necessary to maintain rigidity, and there is an attempt to provide a reinforcing plate inside the box type. (For example, see Patent Documents 1 and 2).
JP 2000-248573 A JP 2002-242227 A

ところで前記従来の補強板を内部に溶着により設ける場合、補強板は、ブーム自体が上下左右四面の外板によって箱型となっているため一面への溶着ができないという問題がある。このため前記特許文献１のものはブームを、補強板が溶着された分割型として、該分割されたもの同志をさらに溶着することで補強板全周の溶着ができるようにしている。また特許文献２のものは、補強板を、部材接合部分の裏当て金を兼ねた構造にして溶接接合部分の削減ができるようにしている。
ところがこれらのものは、補強板の溶着が突合せ溶着となるため、充分な強度確保が難しいだけでなく、周回り全体に溶接するものであるため、例えばアームシリンダ取付け部位等の補強部位に合わせて補強板を組み込んだ場合、溶接ダレや溶接歪みが発生したところにシリンダ取付け部材を取付けなくてはならず、強度的に問題が発生する惧れがあるだけでなく、精度の良い加工が難しいという問題がある。しかも後者のものは、外板の溶接隙間以上の厚みが補強板に求められることになって軽量化が果たせないという問題があり、これらに本発明が解決すべき課題がある。 By the way, when the conventional reinforcing plate is provided inside by welding, there is a problem that the reinforcing plate cannot be welded to one side because the boom itself is box-shaped by the upper, lower, left and right outer plates. For this reason, the thing of the said patent document 1 makes it possible to weld a reinforcement board perimeter by further welding this divided thing as a split type | mold with which the reinforcement board was welded. Moreover, the thing of patent document 2 makes it possible to reduce a welding junction part by making the reinforcement board the structure which served as the backing metal of the member junction part.
However, these are not only difficult to secure sufficient strength because the reinforcement plate is welded butt, but also welded to the entire circumference. For example, according to the reinforcement part such as the arm cylinder attachment part. When a reinforcing plate is incorporated, the cylinder mounting member must be mounted where welding sag or welding distortion occurs, which may cause problems in strength and is difficult to perform with high accuracy. There's a problem. In addition, the latter has a problem that the thickness cannot be reduced because the reinforcing plate is required to have a thickness equal to or greater than the weld gap of the outer plate, and there is a problem to be solved by the present invention.

本発明は、上記の如き実情に鑑みこれらの課題を解決することを目的として創作されたものであって、請求項１の発明は、上下面板もしくは前後面板と左右側面板とで形成された中空断面を有する作業腕を供えた作業機械において、前記作業腕は、左右側面板に開設した孔間に渡した補強板を該左右側面板に溶着して左右方向に貫通する貫通筒孔を形成して補強したことを特徴とする作業機械における作業腕である。
請求項２の発明は、補強板は、左右側面板よりも左右方向に突出させ、該突出部位を左右外側から溶接により左右側面板に溶着されていることを特徴とする請求項１記載の作業機械における作業腕である。
請求項３の発明は、補強板は、左右側面板に開設した孔に対応した形状の筒体によって形成されていることを特徴とする請求項１または２記載の作業機械における作業腕である。
請求項４の発明は、貫通筒孔は、作業機械に取付けられる取付け部材の収容室になっていることを特徴とする請求項１ないし３の何れか１記載の作業機械における作業腕である。 The present invention has been created in view of the above-described circumstances and has been created for the purpose of solving these problems. The invention of claim 1 is a hollow formed by an upper and lower surface plate or front and rear surface plates and left and right side plates. In a working machine provided with a working arm having a cross section, the working arm forms a through cylinder hole penetrating in the left-right direction by welding a reinforcing plate passed between holes formed in the left and right side plates to the left and right side plates. It is the working arm in the working machine characterized by having reinforced.
The invention according to claim 2 is characterized in that the reinforcing plate protrudes in the left-right direction from the left and right side plates, and the protruding portion is welded to the left and right side plates by welding from the left and right outer sides. It is a working arm in the machine.
The invention according to claim 3 is the work arm in the work machine according to claim 1 or 2, wherein the reinforcing plate is formed by a cylindrical body having a shape corresponding to the hole formed in the left and right side plates.
According to a fourth aspect of the present invention, in the work arm in the work machine according to any one of the first to third aspects, the through-cylinder hole is a storage chamber for an attachment member attached to the work machine.

請求項１の発明とすることで、作業腕は、左右側面板間には左右方向に渡って貫通する貫通筒孔が形成されることで補強されることになるが、該貫通筒孔は、形成部位を自由に設定できるため、補強したい部位に対応させての形成が簡単で、しかも外部からの溶着でよいため溶着作業および検査が容易となる。
請求項２の発明とすることで、補強板は、左右側板から突出した部位を外側から溶接することで左右側面板に固着されることになって強度アップが確実になると共に、溶着作業も容易になる。
請求項３の発明とすることで、作業腕への貫通筒孔の形成が容易になる。
請求項４の発明とすることで、作業腕を補強するための貫通筒孔が取付け部材の収容室に兼用されることになると共に、取付け部材の保護が図れることになる。 With the invention of claim 1, the work arm is reinforced by forming a through-cylinder hole penetrating in the left-right direction between the left and right side plates. Since the formation site can be set freely, the formation corresponding to the site to be reinforced is easy, and since welding from the outside is sufficient, welding work and inspection are easy.
According to the invention of claim 2, the reinforcing plate is fixed to the left and right side plates by welding the portions protruding from the left and right side plates from the outside, so that the strength is increased and welding work is easy. become.
By setting it as invention of Claim 3, formation of the penetration cylinder hole to a work arm becomes easy.
By setting it as invention of Claim 4, while the penetration cylinder hole for reinforcing a work arm serves as a storage chamber of an attachment member, the attachment member can be protected.

次ぎに、本発明の実施の形態について図面に基づいて説明する。図中、１は油圧ショベルであって、該油圧ショベル１は、クローラ式の下部走行体２に上部旋回体３が旋回自在に設けられ、該上部旋回体３は、キャブ型の運転操縦室４、エンジンルーム５、カウンターウエイト６、フロントアタッチメント７が設けられ、該フロントアタッチメント７は、上部旋回体３に上下揺動自在に軸支される後述のブーム８、該ブーム８の先端に前後方向揺動自在に軸支されたアーム９、該アーム９の先端に前後方向揺動自在に軸支されたバケット１０とを備えて構成されていること等は何れも従来どおりである。   Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a hydraulic excavator. The hydraulic excavator 1 is provided with a crawler-type lower traveling body 2 in which an upper revolving body 3 is turnable. The upper revolving body 3 is a cab type operation cockpit 4. An engine room 5, a counterweight 6, and a front attachment 7. The front attachment 7 is pivotally supported by the upper swing body 3 so as to be swingable up and down. Conventionally, the arm 9 is movably supported, and the arm 9 is configured to include a bucket 10 supported at the tip of the arm 9 so as to be swingable in the front-rear direction.

本実施の形態においては、前記ブーム８に本発明が実施されている。つまりブーム８は、上下面板１１、１２と左右側面板１３、１４とを用いて断面中空状の箱体に形成されているが、左右側面板１３、１４には、アームシリンダ１５を取付けるための取付け部材１６が取付けられる部位に対応する位置、その少し先端側位置、そしてブーム８の先端位置に位置して左右に対向して同一形状の孔１３ａ、１３ｂ、１３ｃおよび１４ａ、１４ｂ、１４ｃがそれぞれ穿設されている。そして互いに左右に対向する孔同志１３ａと１４ａ、１３ｂと１４ｂ、１３ｃと１４ｃのあいだには、孔形状に対応して筒状に形成された補強板１７、１８、１９が、該補強板１７、１８、１９の左右両端部が左右側面板１３、１４から左右方向外方に突出するようにして組み込まれ、そして補強板１７、１８、１９と左右側面板１３、１４とは、前記突出部１７ａ、１８ａ、１９ａにおいて例えば隅肉溶接による溶着２０が左右方向外方から施されて補強板１７、１８、１９が左右両側板１３、１４に一体化されており、これによってブーム８は、長手方向に直交する左右方向を向いた方向の貫通筒孔Ｘ、Ｙ、Ｚが筒孔全周に筒壁が存在する状態で形成されていて補強されている。   In the present embodiment, the present invention is implemented in the boom 8. That is, the boom 8 is formed in a box having a hollow cross section using the upper and lower side plates 11 and 12 and the left and right side plates 13 and 14, but the left and right side plates 13 and 14 are for attaching the arm cylinders 15 to each other. A hole 13a, 13b, 13c and 14a, 14b, 14c having the same shape are located at a position corresponding to a portion to which the mounting member 16 is mounted, a slightly distal end position thereof, and a left and right position at the distal end position of the boom 8. It has been drilled. And between the holes 13a and 14a, 13b and 14b, 13c and 14c that are opposed to each other on the left and right, reinforcing plates 17, 18, and 19 that are formed in a cylindrical shape corresponding to the hole shape are the reinforcing plates 17, The left and right end portions of the left and right side plates 13, 19 are incorporated so as to protrude outward in the left-right direction from the left and right side plates 13, 14, and the reinforcing plates 17, 18, 19 and the left and right side plates 13, 14 are connected to the protruding portion 17a. , 18a, 19a, for example, a fillet weld 20 is applied from the outside in the left-right direction, and the reinforcing plates 17, 18, 19 are integrated with the left and right side plates 13, 14, whereby the boom 8 is moved in the longitudinal direction. The through-cylinder holes X, Y, and Z in the direction facing the right and left direction orthogonal to are formed and reinforced in a state where a cylinder wall exists around the entire circumference of the cylinder hole.

２１はブーム８に設けられる照明灯であって、該照明灯２１は、支軸２２によって揺動自在に支持されていて、前方を照射する作業姿勢と、貫通筒孔Ｘ内に収容される収容姿勢とに変姿できるようになっている。尚、照明灯２１は図示しない係止手段によって作業姿勢、収容姿勢に係止保持できるようになっている。また、これら貫通筒孔Ｘ、Ｙ、Ｚに収容されるものは照明灯に限らず、例えばバルブ類や工具類等各種の部材を必要において収容できることはもちろんである。   Reference numeral 21 denotes an illuminating lamp provided on the boom 8, and the illuminating lamp 21 is swingably supported by a support shaft 22, and has a working posture for irradiating the front, and an accommodation accommodated in the through cylinder hole X. It can be transformed into a posture. The illuminating lamp 21 can be locked and held in a working position and a stored position by locking means (not shown). Moreover, what is accommodated in these through-cylinder holes X, Y, and Z is not limited to illumination lamps, and of course, various members such as bulbs and tools can be accommodated as needed.

叙述の如く構成された本発明の実施の形態において、ブーム８は、左右側面板１３、１４に形成された対向位置の孔同志１３ａと１４ａ、１３ｂと１４ｂ、１３ｃと１４ｃのあいだに、孔形状に対応して筒状の補強板１７、１８、１９が組み込まれて溶着により左右側面板１３、１４に一体化されていて、貫通筒孔Ｘ、Ｙ、Ｚが形成されている結果、該貫通筒孔Ｘ、Ｙ、Ｚがブーム８の強度メンバーとなって機能し、ブーム８は強固に補強された高剛性のものになる。しかもブーム８は、左右側面板１３、１４に孔１３ａ、１４ａ、１３ｂ、１４ｂ、１３ｃ、１４ｃが開設された分、軽量化されることになる。   In the embodiment of the present invention configured as described above, the boom 8 has a hole shape between the holes 13a and 14a, 13b and 14b, and 13c and 14c at opposite positions formed in the left and right side plates 13 and 14, respectively. As a result, cylindrical reinforcing plates 17, 18, and 19 are incorporated and integrated with the left and right side plates 13 and 14 by welding, and through-holes X, Y, and Z are formed. The cylinder holes X, Y, and Z function as strength members of the boom 8, and the boom 8 is a highly rigid material that is reinforced. Moreover, the boom 8 is reduced in weight by the amount of opening of the holes 13a, 14a, 13b, 14b, 13c, 14c in the left and right side plates 13, 14.

しかもこの補強板１７、１８、１９による補強は、従来のように箱型周面全域にわたって溶着を施してするものではなく、左右側面板１３、１４の板幅の一部に溶着する補強でよいことになるから、上下面板１１、１２には補強のための溶着がないことになって溶接歪等が発生したりすることがなく、シリンダ取付け部材１６は溶接歪み等のない部位に精度よく取付けることができる。   Moreover, the reinforcement by the reinforcing plates 17, 18, 19 is not performed by welding over the entire area of the box-shaped peripheral surface as in the prior art, but may be reinforcement that is welded to a part of the plate width of the left and right side plates 13, 14. Therefore, the upper and lower plates 11 and 12 are not welded for reinforcement, so that welding distortion or the like does not occur, and the cylinder mounting member 16 is accurately attached to a portion without welding distortion or the like. be able to.

そしてこのような貫通筒孔Ｘ、Ｙ、Ｚによる強固な補強をするにあたり、左右側面板１３、１４に形成の孔形状に対応して形成された筒状の補強板１７、１８、１９を組み込んだ後に外側から溶接すればよいため、作業性が優れたものになる。しかもこのものでは、補強板１７、１８、１９は、左右両端部が左右側面板１３、１４から左右方向外方に突出するようにして組み込まれ、そして補強板１７、１８、１９と左右側面板１３、１４とは、前記突出部１７ａ、１８ａ、１９ａの外周について隅肉溶接による溶着２０が左右方向外方から施されて一体化されており、これによってブーム８は、隅肉溶接による優れた剪断応力を発揮できることになって、さらなる剛性アップが達成できると共に、溶接作業も簡便化される。   And, in order to reinforce firmly by such through cylinder holes X, Y, Z, cylindrical reinforcing plates 17, 18, 19 formed corresponding to the hole shapes formed in the left and right side plates 13, 14 are incorporated. After that, it only has to be welded from the outside, so the workability is excellent. In addition, in this structure, the reinforcing plates 17, 18, and 19 are assembled so that the left and right ends protrude from the left and right side plates 13 and 14 outward in the left and right directions, and the reinforcing plates 17, 18, and 19 and the left and right side plates are mounted. 13 and 14 are integrated with the outer periphery of the protrusions 17a, 18a, and 19a by applying fillet welding 20 from the outside in the left-right direction, so that the boom 8 is excellent by fillet welding. Since the shear stress can be exerted, the rigidity can be further increased and the welding operation is simplified.

そのうえこのものでは、貫通筒孔Ａが照明灯２１の収容室として兼用化できるため、照明灯２１の保護が図れることになるという利点もある。   Moreover, in this case, since the through-cylinder hole A can also be used as a storage chamber for the illuminating lamp 21, there is an advantage that the illuminating lamp 21 can be protected.

尚、本発明は前記実施の形態に限定されないものであることは勿論であって、本発明が実施される作業腕としては、ブーム８に限定されず、アーム９等、適宜のものに採用できることは言うまでも無い。また補強板の筒形状としては三角筒、四角筒等の多角筒は勿論のこと、円筒、楕円筒等の各種の筒形状にすることができる。   Needless to say, the present invention is not limited to the above-described embodiment, and the working arm in which the present invention is implemented is not limited to the boom 8 and can be adopted as appropriate, such as the arm 9. Needless to say. Further, as the cylindrical shape of the reinforcing plate, various cylindrical shapes such as a cylinder and an elliptic cylinder can be used as well as a polygonal cylinder such as a triangular cylinder and a square cylinder.

油圧ショベルの側面図である。It is a side view of a hydraulic excavator. ブームの斜視図である。It is a perspective view of a boom. ブームの側面図である。It is a side view of a boom. （Ａ）、（Ｂ）は補強板を分解した状態のブームの斜視図、要部の正面断面拡大図である。(A), (B) is the perspective view of the boom of the state which decomposed | disassembled the reinforcement board, and the front cross-sectional enlarged view of the principal part. 照明灯部位の平面断面図である。It is a plane sectional view of an illuminating lamp part.

符号の説明Explanation of symbols

８ ブーム
１１、１２ 上下面板
１３、１４ 左右側面板
１３ａ、１３ｂ、１３ｃ 孔
１４ａ、１４ｂ、１４ｃ 孔
１７、１８、１９ 補強板
２０ 溶着
Ｘ、Ｙ、Ｚ 貫通筒孔 8 Boom 11, 12 Upper and lower surface plates 13, 14 Left and right side plates 13 a, 13 b, 13 c Holes 14 a, 14 b, 14 c Holes 17, 18, 19 Reinforcement plate 20 Welding X, Y, Z Through cylinder hole

Claims (4)

上下面板もしくは前後面板と左右側面板とで形成された中空断面を有する作業腕を供えた作業機械において、前記作業腕は、左右側面板に開設した孔間に渡した補強板を該左右側面板に溶着して左右方向に貫通する貫通筒孔を形成して補強したことを特徴とする作業機械における作業腕。   In a working machine provided with working arms having a hollow cross section formed by upper and lower surface plates or front and rear surface plates and left and right side plates, the working arms include reinforcing plates passed between holes formed in the left and right side plates. A working arm in a working machine, wherein the working arm is reinforced by forming a through-cylinder hole that is welded to and penetrates in the left-right direction. 補強板は、左右側面板よりも左右方向に突出させ、該突出部位を左右外側から溶接により左右側面板に溶着されていることを特徴とする請求項１記載の作業機械における作業腕。   The working arm in a working machine according to claim 1, wherein the reinforcing plate protrudes in the left-right direction from the left and right side plates, and the protruding portion is welded to the left and right side plates by welding from the left and right outer sides. 補強板は、左右側面板に開設した孔に対応した形状の筒体によって形成されていることを特徴とする請求項１または２記載の作業機械における作業腕。   The working arm in the working machine according to claim 1 or 2, wherein the reinforcing plate is formed by a cylindrical body having a shape corresponding to a hole opened in the left and right side plates. 貫通筒孔は、作業機械に取付けられる取付け部材の収容室になっていることを特徴とする請求項１ないし３の何れか１記載の作業機械における作業腕。   The work arm in the work machine according to any one of claims 1 to 3, wherein the through cylinder hole is a storage chamber for an attachment member attached to the work machine.
JP2006119103A 2006-04-24 2006-04-24 Work arm of work machine Pending JP2007291670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006119103A JP2007291670A (en) 2006-04-24 2006-04-24 Work arm of work machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006119103A JP2007291670A (en) 2006-04-24 2006-04-24 Work arm of work machine

Publications (1)

Publication Number Publication Date
JP2007291670A true JP2007291670A (en) 2007-11-08

Family

ID=38762553

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006119103A Pending JP2007291670A (en) 2006-04-24 2006-04-24 Work arm of work machine

Country Status (1)

Country Link
JP (1) JP2007291670A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108643273A (en) * 2018-07-09 2018-10-12 三重机有限公司 Positioning pin, counterweight location structure and assembly method, excavator
WO2023185528A1 (en) * 2022-03-29 2023-10-05 中联重科股份有限公司 Hollowed-out boom segment, segmented type boom, and boom assembly

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03183824A (en) * 1989-12-13 1991-08-09 Kubota Corp Boom assembly of work machine
JPH11140901A (en) * 1997-11-07 1999-05-25 Komatsu Ltd Working machine arm for hydraulic shovel
JP2000248573A (en) * 1999-03-03 2000-09-12 Shin Caterpillar Mitsubishi Ltd Work arm structure of work machine
JP2003336279A (en) * 2002-05-20 2003-11-28 Yanmar Co Ltd Ultrasmall turning working vehicle
JP2004143853A (en) * 2002-10-25 2004-05-20 Hitachi Constr Mach Co Ltd Working device of construction machinery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03183824A (en) * 1989-12-13 1991-08-09 Kubota Corp Boom assembly of work machine
JPH11140901A (en) * 1997-11-07 1999-05-25 Komatsu Ltd Working machine arm for hydraulic shovel
JP2000248573A (en) * 1999-03-03 2000-09-12 Shin Caterpillar Mitsubishi Ltd Work arm structure of work machine
JP2003336279A (en) * 2002-05-20 2003-11-28 Yanmar Co Ltd Ultrasmall turning working vehicle
JP2004143853A (en) * 2002-10-25 2004-05-20 Hitachi Constr Mach Co Ltd Working device of construction machinery

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108643273A (en) * 2018-07-09 2018-10-12 三重机有限公司 Positioning pin, counterweight location structure and assembly method, excavator
CN108643273B (en) * 2018-07-09 2023-11-28 三一重机有限公司 Locating pin, counterweight locating structure, assembly method and excavator
WO2023185528A1 (en) * 2022-03-29 2023-10-05 中联重科股份有限公司 Hollowed-out boom segment, segmented type boom, and boom assembly

Similar Documents

Publication Publication Date Title
US7735248B2 (en) Piping struture of front work machine
US20140334906A1 (en) Arm for construction machine
WO2008018194A1 (en) Boom
JP2007085036A (en) Fixing structure of work machine
JP2007247145A (en) Boom of excavating work machine
JP2006321294A (en) Fuel tank of construction machine
JP2007291670A (en) Work arm of work machine
JP2010196408A (en) Revolving frame of construction machine
JP2010229746A (en) Working arm of construction machinery
JP2010090639A (en) Working machine
JP2006336291A (en) Boom structure for loader working machine
JP2007247143A (en) Arm of excavating work machine
JP6013286B2 (en) Work equipment boom
JP2007069807A (en) Cab and working machine
JP4940189B2 (en) Backhoe boom structure
JP4372045B2 (en) Body frame of work vehicle
JP4236645B2 (en) Mounting structure of rotary joint on turning work machine
KR20130116819A (en) Clamshell bucket
JP2016089375A (en) Construction machine boom
JP5949076B2 (en) Work machine
JP2004108019A (en) Working arm of construction machine and its manufacturing method
JP2008082019A (en) Cylinder installing structure of excavation work machine
JP2009203683A (en) Working vehicle
JP2006045976A (en) Construction machine
JP2004092210A (en) Working machine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20081120

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A711

Effective date: 20100713

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20100812

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20101122

A131 Notification of reasons for refusal

Effective date: 20110106

Free format text: JAPANESE INTERMEDIATE CODE: A131

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20110707