WO2012144037A1 - 建設機械用ブーム - Google Patents
建設機械用ブーム Download PDFInfo
- Publication number
- WO2012144037A1 WO2012144037A1 PCT/JP2011/059748 JP2011059748W WO2012144037A1 WO 2012144037 A1 WO2012144037 A1 WO 2012144037A1 JP 2011059748 W JP2011059748 W JP 2011059748W WO 2012144037 A1 WO2012144037 A1 WO 2012144037A1
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- WIPO (PCT)
- Prior art keywords
- plate
- web
- boom
- plates
- lower flange
- Prior art date
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
Definitions
- the present invention relates to a boom for a construction machine that is suitably used as a work arm, for example, in a working device of a hydraulic excavator.
- a working device provided in a construction machine such as a hydraulic excavator includes a boom whose base end side is connected to a vehicle body side frame so as to be able to move up and down, an arm rotatably connected to a distal end side of the boom, A work tool such as an excavation bucket that is rotatably connected to the distal end side of the arm, and a boom cylinder, an arm cylinder, and a work tool cylinder for operating the boom, the arm, and the work tool.
- the boom includes a left and right web plate, an upper flange plate joined to the upper end side of the left and right web plates by welding, and a lower end side of the left and right web plates. It is formed as a box-shaped structure having a closed cross-sectional structure with a quadrangular cross section from a lower flange plate joined by welding.
- This boom constitutes a work arm for construction machinery, which is a long welded structure having a total length of several meters or more.
- the boom as a working arm for construction machinery takes a great deal of time in the manufacturing process including welding work, and improving the workability during assembly is a major issue.
- the boom is divided into three in the length direction, and a total of three box-type structures are manufactured in advance, and then the box-type structures are joined together by welding in the front and rear directions.
- patent document 1 what was set as the structure which assembles
- the boom according to the prior art receives a shock load due to the excavation reaction force generated during excavation work such as earth and sand, and receives a large bending moment, a torsional moment, etc., so it is necessary to form a sturdy structure.
- the left and right web plates and the upper and lower flange plates constituting the boom are also increased in bending strength, torsional strength, and the like by increasing the plate thickness.
- the present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to reduce the overall weight and reduce the weight while ensuring sufficient bending strength, torsional strength, and the like. It is to provide a boom for construction machinery.
- the present invention provides a left and right web plate, an upper flange plate joined by welding to the upper end side of the left and right web plates, and a lower end of the left and right web plates.
- a lower flange plate joined by welding to the side, and the left and right web plates and the upper and lower flange plates are formed as a box-type structure having a closed cross-sectional structure with a square cross section Applies to mechanical booms.
- a feature of the configuration adopted by the invention of claim 1 is that the left web plate and the right web plate are joined together at least five sheets of different shapes from each other along the weld line at the front and rear ends.
- the upper flange plate is formed by joining at least three plate members having different shapes from each other along the weld line at the front and rear end portions, and the lower flange plate is A total of at least six plate members having different shapes are joined together at the front and rear end portions along the weld line, and the end portions of the weld lines between the respective plate members constituting the upper flange plate
- the ends of the weld lines between the plate members constituting the left and right web plates are arranged at different positions in the front and rear directions, and the ends of the weld lines between the plate members constituting the lower flange plate Configure the left and right web plates
- the left web plate and the right web plate can be formed by joining at least five plate materials having different shapes from each other along the weld lines at the front and rear ends.
- the upper flange plate can be formed by joining at least a total of three plates with different shapes along the weld line at the front and rear ends, and the lower flange plate with at least a total of different shapes. It can be formed by joining six plate members along the weld line at the front and rear ends.
- the ends of the wires are connected to each other in the front and rear directions with respect to the end of the weld line between the plates constituting the upper flange plate and the end of the weld line between the plates constituting the lower flange plate, respectively. It can be arranged at different positions. As a result, it is possible to avoid the overlap of the end portions of the weld line where the weld defect is likely to occur, thereby reducing the possibility of the occurrence of the weld defect and manufacturing a boom having a high-strength weld structure. . As a result, it is possible to reduce the plate thickness of each plate material constituting the boom, thereby reducing the overall weight and reducing the weight. In addition, the impact resistance of the boom against excavation reaction force and the like can be increased, and sufficient bending strength and torsional strength can be secured.
- a boom foot side mounting member is provided between the left and right web plates and is welded between the upper and lower flange plates located on the rear end side in the front and rear directions.
- a boom cylinder mounting member is provided that is welded to a plate material that is positioned at the center most in the front and rear directions of the plate material, and is connected to the boom cylinder so as to be rotatable.
- the plate material on the rear end side to which the boom foot side mounting member is welded and the plate material located in the center are configured to be thicker than the other three plate materials.
- the plate member located at the center in the front and rear directions and the plate member on the rear end side where the boom foot side mounting member is provided A thick plate material can be used, and the other three plate materials can be thin plate materials.
- the plate member on the rear end side can support the boom foot side mounting member together with the upper and lower flange plates with a sturdy structure, and the support strength can be increased.
- the plate member located at the center can support the boom cylinder mounting member to which the boom cylinder is rotatably connected with a sturdy structure, and can increase the support strength.
- a boom foot side mounting member is provided between the left and right web plates and is welded between the upper and lower flange plates located on the rear end side in the front and rear directions.
- a boom cylinder mounting member is provided that is welded to a plate material that is positioned at the center in the front and rear directions of the sheet material, and a boom cylinder is rotatably connected to the upper flange plate, than the boom cylinder mounting member.
- An arm cylinder mounting member that is positioned on the upper surface of the plate material located in the center among the three plate materials in total and is connected to the arm cylinder so as to be rotatable is provided, and the left and right web plates are The plate located at the center is arranged such that the front and rear rear welding lines are substantially orthogonal to the first reference line connecting the boom foot side mounting member and the boom cylinder mounting member, Back in front The weld line has a configuration to place in a relationship substantially perpendicular to the second reference line connecting between the arm cylinder mounting member and the boom cylinder mounting member.
- the plate member located at the center in the front and rear directions is welded to the opposite plate member joined to the rear end portion.
- the line can be arranged at a position substantially orthogonal to the first reference line. For this reason, the welding strength of the plate material located in the center and the rear counterpart plate material can be increased against the stress generated between the boom cylinder mounting member to which the boom cylinder is coupled and the boom foot side mounting member.
- the plate material located at the center can be arranged at a position where the weld line between the other plate material joined to the end portion on the rear side is substantially orthogonal to the second reference line. For this reason, with respect to the stress generated between the boom cylinder mounting member to which the boom cylinder is connected and the arm cylinder mounting member to which the arm cylinder is connected, the welding strength between the plate material located at the center and the other counterpart plate material is reduced. Can be increased.
- the left and right web plates are joined to a first web member positioned on the rear end side in the front and rear directions, and a rear end portion is joined to a front end portion of the first web member.
- Each of the left and right plate members is composed of a total of five plate members, each of which includes a fourth web member and a fifth web member whose rear end is joined to the front end of the fourth web member.
- a first partition plate is provided between the upper and lower flange plates between the second web members constituting the web plate, and the upper and lower flange plates are provided between the fourth web members.
- a second partition plate is provided between them.
- the first partition plate is joined by welding between the second web member of the left and right web plates made of the first to fifth web members and located between the upper and lower flange plates.
- the first partition plate can increase the joining strength by welding between the left and right web plates and the upper and lower flange plates.
- a second partition plate can be provided by welding and located between the upper and lower flange plates.
- the left and right web plates are provided with arm-side attachment members that are positioned between the front and rear front ends and are welded between the upper and lower flange plates.
- the arm side mounting member can be provided by welding between the portion located on the front end side of the total length of the left and right web plates and the upper and lower flange plates, and this arm side mounting member
- the arm can be rotatably connected to the tip end side of the boom.
- FIG. 1 It is a front view which shows the hydraulic shovel provided with the boom by the 1st Embodiment of this invention. It is a front view which shows the boom in FIG. 1 as a single unit. It is the elements on larger scale of FIG. 2 which shows the length direction intermediate part of a boom. It is a disassembled perspective view which shows each board
- FIGS. 1 to 9 show a boom of a hydraulic excavator according to the first embodiment of the present invention.
- reference numeral 1 denotes a hydraulic excavator as a construction machine.
- the hydraulic excavator 1 is mounted on a crawler type lower traveling body 2 capable of self-propelling as shown in FIG.
- the upper revolving body 3 and a working device 8 to be described later are roughly configured.
- the upper swing body 3 of the hydraulic excavator 1 constitutes the vehicle body of the construction machine together with the lower traveling body 2.
- the upper swing body 3 includes a swing frame 4, a cab 5, a counterweight 6, a building cover 7, and the like, which will be described later.
- Reference numeral 4 denotes a revolving frame that constitutes a frame of the upper revolving structure 3.
- the revolving frame 4 has a working device 8 (described later) attached to the front side of the revolving frame 4 and a counterweight 6 (described later) attached to the rear side.
- a cab 5 is disposed on the left side of the front portion of the swivel frame 4, and the cab 5 defines a cab inside. In the cab 5, a driver's seat on which an operator is seated, an operation lever, a travel lever or a pedal (none of which are shown) are disposed.
- the counterweight 6 is a counterweight provided on the rear end side of the revolving frame 4.
- the counterweight 6 is detachably mounted on the rear end side of the revolving frame 4, and the entire upper revolving unit 3 with respect to the front working device 8.
- the weight balance is taken.
- a building cover 7 (described later) that houses an engine (not shown) and the like is provided.
- Reference numeral 7 denotes a building cover that is positioned between the cab 5 and the counterweight 6 and is erected on the revolving frame 4.
- the building cover 7 is formed by using a plurality of metal panels made of thin steel plates, for example.
- the machine room (not shown) which accommodates an engine etc. in the inside is formed.
- the working device 8 is a working device provided at the front portion of the upper swing body 3 so as to be able to be lifted and lowered.
- the working device 8 includes a boom 11 which will be described later, and an arm 9 which is attached to the tip side of the boom 11 so as to be able to be lifted and lowered.
- a bucket 10 as a work tool that is rotatably provided on the distal end side of the arm 9.
- the boom 11 of the work device 8 is moved up and down with respect to the revolving frame 4 by the boom cylinder 11A, and the arm 9 is moved up and down by the arm cylinder 9A on the tip side of the boom 11.
- the bucket 10 as a work tool is rotated up and down by the bucket cylinder 10 ⁇ / b> A on the distal end side of the arm 9.
- Reference numeral 11 denotes a boom that constitutes a working arm of the working device 8, and the boom 11 is formed as a long box-shaped structure as shown in FIG. It is something to be lifted.
- the boom 11 includes a pair of left and right web plates 12 and 12 that extend in the length direction (front and rear directions) of the boom 11 and face each other in the left and right directions.
- the upper and lower ends of each web plate 12 are joined together by welding, and the lower flange plates 14 and 16 are formed as box-shaped structures having a rectangular cross section.
- the left and right web plates 12 and the upper and lower flange plates 14 and 16 are formed using, for example, a plate material made of high-strength steel of 550 to 600 MPa (megapascal) class, thereby enabling the plate thickness of each plate material. I try to make it as thin as possible.
- partition plates 18 and 19, boss members 20 and 21, and bracket members 22 and 23, which will be described later, are also formed using steel materials made of similar high-tensile steel.
- the left web board 12 shows a pair of left and right web plates forming the side surface of the boom 11.
- the left web board 12 and the right web board 12 are formed in the mutually same shape, one web board 12 is demonstrated.
- the front and rear rear end sides in the length direction of the boom 11 correspond to the rear side of the boom 11 when viewed from the vehicle rear side of the excavator 1, and the front and rear front end sides are: This corresponds to the front side (tip side) of the boom 11 when viewed from the vehicle rear side of the excavator 1.
- the web plate 12 is sequentially arranged on the front side and the first web member 12 ⁇ / b> A located on the rear end side (the foot side of the boom 11) of the entire length of the web plate 12, and the shapes thereof are different from each other.
- the second web member 12B, the third web member 12C, the fourth web member 12D, and the fifth web member 12E are configured by a total of five plate members.
- the first web member 12A located on the most rear side in the front and rear directions is formed by press-molding the flat plate made of the high-tensile steel so that the width dimension in the upper and lower directions is directed from the rear side to the front side. It is formed in a rectangular shape that gradually increases.
- the first web member 12A is bent so as to warp outward in the left and right directions at the position of the folding line 12A1 near the front side.
- the second web material 12B is also formed into a quadrangular shape in which the width dimension in the upper and lower directions gradually increases from the rear side to the front side by press-molding the flat plate material made of the high-tensile steel. .
- the third web member 12C located in the front and rearmost center of the web plate 12 is formed in a parallelogram shape as shown in FIG. 2 by press-molding the flat plate made of the high-tensile steel. Yes.
- the upper and lower ends of the third web member 12C are arc-shaped edges 12C1 and 12C2 having predetermined curvatures, respectively.
- the upper edge portion 12C1 has, for example, a radius of curvature of 1800 mm before and after, and the lower edge portion 12C2 has a substantially similar radius of curvature.
- a circular punching hole 12C3 ⁇ ⁇ is formed in the third web member 12C between the edges 12C1 and 12C2, and an annular flange 21B of a boss member 21 described later is joined to the punching hole 12C3 by welding.
- the fourth web member 12D is formed in a trapezoidal shape in which the upper base is longer than the lower base by press-molding a flat plate made of the high-tensile steel. Therefore, the boom 11 has a shape in which a middle portion in the length direction is curved in a bow shape by the third web material 12C and the fourth web material 12D of the left and right web plates 12.
- the fifth web member 12E has the largest length in the front and rear directions and the smallest thickness.
- the second web member 12B has the rear end joined to the front end of the first web member 12A along the weld line 13A. Butt welding with a V-shaped groove is performed at the position of the welding line 13A, and this welding line 13A has one end 13A1 and the other end 13A2.
- the rear end of the third web member 12C is joined to the front end of the second web member 12B along the weld line 13B. Butt welding with a V-shaped groove is also performed at the position of the weld line 13B, and this weld line 13B has one end portion 13B1 and the other end portion 13B2.
- the rear end of the fourth web member 12D is joined to the front end of the third web member 12C along the weld line 13C. Butt welding by a V-shaped groove is also performed at the position of the weld line 13C, and this weld line 13C has one end portion 13C1 and the other end portion 13C2. Further, the fifth web member 12E has the rear end joined to the front end of the fourth web member 12D along the weld line 13D. Butt welding with a V-shaped groove is also performed at the position of the weld line 13D, and this weld line 13D has one end portion 13D1 and the other end portion 13D2.
- the load sharing is greatest in the first web member 12A and the third web member 12C.
- the first web member The plate thickness t1a of 12A and the plate thickness t1c of the third web member 12C are formed to be about 14 mm, for example.
- the plate thickness t1b of the second web material 12B and the plate thickness t1d of the fourth web material 12D are, for example, about 10 mm.
- the plate thickness t1e of the fifth web member 12E is, for example, about 9 mm and is formed to be the thinnest. Accordingly, the plate thicknesses t1a to t1e of the first to fifth web members 12A to 12E have the following relationship.
- the weld line 13B between the second web member 12B and the third web member 12C has an angle ⁇ 1 (for example, in a range close to a first orthogonal line AA described later) , ⁇ 1 ⁇ 4.5 to 4.9 degrees).
- the weld line 13C between the third web member 12C and the fourth web member 12D has an angle ⁇ 2 (for example, a range close to a second orthogonal line BB described later) ⁇ 2 ⁇ 10.5 to 11.5 degrees).
- the intersection of the upper edge portion 12C1 of the third web member 12C and the end portion 13C1 of the weld line 13C is the front side by a dimension a (for example, a ⁇ 113 to 116 mm) with respect to the rear end portion of the bracket member 23 described later. It is arranged at the position.
- the upper flange plate 14 is an upper flange plate joined to the upper end side of the left and right web plates 12 by fillet welding. That is, as shown in FIG. 4, the upper flange plate 14 is positioned on the rear upper flange member 14 ⁇ / b> A located on the rear side in the front and rear direction, and on the front side in the front and rear direction, of the entire length of the upper flange plate 14.
- the front upper flange member 14B and the intermediate upper flange member 14C disposed between the rear upper flange member 14A and the front upper flange member 14B are constituted by a total of three plate members.
- the middle upper flange member 14C is disposed at a position that covers a boss member 21 described later from above.
- the rear upper flange member 14A, the front upper flange member 14B, and the intermediate upper flange member 14C are each formed in a quadrangular shape by press-molding the flat plate material made of the high-tensile steel, and extend in the front and rear directions with different shapes. ing.
- the length of the rear upper flange member 14A is the shortest, the middle upper flange member 14C is the longest, and the front upper flange member 14B is formed at an intermediate length between the two.
- the upper flange plate 14 is formed to have a plate thickness t2c of the intermediate upper flange member 14C, for example, about 14 mm. .
- the plate thickness t2a of the rear upper flange member 14A is formed to an intermediate plate thickness of about 10 mm, for example, and the plate thickness t2b of the front upper flange member 14B is formed to be thinnest, for example, about 8 mm. Accordingly, the plate thickness t2a of the rear upper flange member 14A, the plate thickness t2b of the front upper flange member 14B, and the plate thickness t2c of the intermediate upper flange member 14C have the following relationship.
- the intermediate upper flange member 14C has a rear end joined to a front end of the rear upper flange member 14A along a weld line 15A. Butt welding with a V-shaped groove is performed at the position of the welding line 15A, and this welding line 15A has one end 15A1 and the other end 15A2.
- the front upper flange member 14B has a rear end joined to a front end of the intermediate upper flange member 14C along the weld line 15B. Butt welding with a V-shaped groove is also performed at the position of the weld line 15B, and this weld line 15B has one end 15B1 and the other end 15B2.
- the upper flange plate 14 is subjected to roll processing after plate joining in a state where the intermediate upper flange member 14C is joined along the weld lines 15A and 15B between the rear upper flange member 14A and the front upper flange member 14B. .
- the upper flange plate 14 is curved as shown in FIG. That is, the rear upper flange member 14 ⁇ / b> A and the intermediate upper flange member 14 ⁇ / b> C of the upper flange plate 14 are curved into a shape along an arcuate contour line on the upper end side of the web plate 12.
- the upper flange plate 14 composed of the rear upper flange member 14A, the front upper flange member 14B and the intermediate upper flange member 14C is joined to the upper end sides of the left and right web plates 12 by welding.
- the weld lines 13A, 13B, 13C, and 13D of the web plate 12 have end portions 13A1, 13B1, 13C1, and 13D1 that are end portions 15A1 and 15B1 ⁇ (end portions 15A2, 15B1, end portions of the weld lines 15A and 15B of the upper flange plate 14, respectively. 15B2) and the welding position are arranged so as not to overlap.
- end portions 13A1, 13B1, 13C1, 13D1 of the weld lines 13A to 13D and the end portions 15A1, 15B1 (end portions 15A2, 15B2) of the weld lines 15A, 15B are different from each other in the front and rear directions of the boom 11. Is arranged.
- the lower flange plate 16 is a lower flange plate joined to the lower end side of the left and right web plates 12 by welding. That is, as shown in FIG. 4, the lower flange plate 16 has a total of six plate members arranged in order from the rear side to the front side in the front and rear directions of the total length of the lower flange plate 16, that is, the first The lower flange member 16A, the second lower flange member 16B, the third lower flange member 16C, the fourth lower flange member 16D, the fifth lower flange member 16E, and the sixth lower flange member 16F are configured. Among these, the third lower flange member 16C is disposed at a position below the boss member 21 described later.
- These lower flange members 16A to 16F are each formed in a quadrangular shape by press-molding the flat plate material made of the high-tensile steel, and extend in the front and rear directions with different shapes.
- the length dimension of the third lower flange material 16C located at the middle between the front and rear directions is the longest, and the second lower flange material 16B and the sixth lower flange material 16F are formed the shortest.
- the fourth lower flange member 16D is formed longer than the second and sixth lower flange members 16B and 16F.
- the first lower flange member 16A and the fifth lower flange member 16E are formed shorter than the third lower flange member 16C and longer than the fourth lower flange member 16D.
- the lower flange plate 16 is formed to have a thickness t3c of the third lower flange member 16C located in the middle between the front and rear directions, for example, about 12 mm.
- the plate thicknesses t3a and t3b of the first and second lower flange members 16A and 16B are, for example, about 9 mm.
- the plate thicknesses t3d, t3e, and t3f of the fourth, fifth, and sixth lower flange members 16D, 16E, and 16F are, for example, about 8 mm and the thinnest. Accordingly, the plate thicknesses t3a to t3f of the first to sixth lower flange members 16A to 16F have the following relationship.
- the third lower flange member 16 ⁇ / b> C is subjected to roll processing prior to sheet joining, and the third lower flange member 16 ⁇ / b> C is curved into a shape along an arc-shaped contour line on the lower end side of the web plate 12. Is done. Thereafter, the front end of the third lower flange member 16C is joined to the rear end of the fourth lower flange member 16D along the weld line 17A, and butt welding with a V-shaped groove is performed at the position of the weld line 17A. Done. As shown in FIG. 5, the weld line 17A has one end 17A1 and the other end 17A2. As shown in FIG.
- the third lower flange member 16 ⁇ / b> C and the fourth lower flange member 16 ⁇ / b> D formed by joining each other are attached to the left and right web plates 12 which are canned and welded to the upper flange plate 14. On the other hand, it joins by welding so that the lower end side of the intermediate part of the length direction may be partially closed.
- the lower flange plate 16 is configured such that the second lower flange member 16B and the sixth lower flange member 16F having a short length partly block the lower end side of the left and right web plates 12. Joined by welding. At this time, the rear end portion of the second lower flange member 16B is joined along the weld line 17B (see FIG. 9) to the front end portion of the third lower flange member 16C, and the two are brought into contact with each other at the position of the weld line 17B. In this state, both sides are welded on the inside and outside. As shown in FIG. 9, the weld line 17B has one end 17B1 and the other end 17B2.
- the first lower flange member 16A and the fifth lower flange member 16E constitute a lid member that finally closes between the web plates 12 of the boom can assembly 31 described later. That is, when the boom 11 having a quadrangular closed cross-sectional structure is welded to the can, the first lower flange member 16A and the fifth lower flange member 16E are arranged at the lower end side with respect to the left and right web plates 12. Are joined by welding so as to be closed. At this time, the rear end portion of the first lower flange member 16A is joined to the front end portion of the second lower flange member 16B along the weld line 17C (see FIG. 9), and the backing material is located at the position of the weld line 17C. Butt welding with a V-shaped groove using (not shown) is performed. As shown in FIG. 9, the weld line 17C has one end 17C1 and the other end 17C2.
- the rear end of the fifth lower flange member 16E is joined to the front end of the fourth lower flange member 16D along the weld line 17D, and the front end of the fifth lower flange member 16E is the sixth lower flange member. It joins along the welding line 17E to the rear side edge part of the material 16F. Also in this case, butt welding with a V-shaped groove using a backing material (not shown) is performed at the positions of the welding lines 17D and 17E. As shown in FIG. 9, the weld line 17D has one end 17D1 and the other end 17D2, and the weld line 17E has one end 17E1 and the other end 17E2. Yes.
- the welding lines 17A of the lower flange plate 16 are arranged such that the end portions 17A1 and 17A2 do not overlap the welding positions with the end portions 13C2 and 13D2 of the welding lines 13C and 13D of the left and right web plates 12. ing. That is, the end portions 13C2 and 13D2 of the weld lines 13C and 13D and the end portions 17A1 and 17A2 of the weld line 17A are arranged at different positions in the front and rear directions of the boom 11.
- the end portions 17B1 and 17B2 of the weld line 17B are arranged so that the welding position does not overlap with the end portion 13A2 of the weld line 13A of the web plate 12. That is, the end portion 13A2 of the weld line 13A and the end portions 17B1 and 17B2 of the weld line 17B are arranged at different positions in the front and rear directions of the boom 11.
- the end portions 17C1C and 17C2 of the weld line 17C are also arranged so that the welding position does not overlap with the end portion 13A2 of the weld line 13A of the web plate 12, for example. That is, the end portion 13A2 of the welding line 13A and the end portions 17C1 and 17C2 of the welding line 17C are arranged at different positions in the front and rear directions of the boom 11.
- the end portions 17D1 and 17D2 of the welding line 17D are also arranged so that the welding position does not overlap with the end portion 13D2 of the welding line 13D, for example.
- the end portion 13D2 of the welding line 13D and the end portions 17D1, 17D2 of the welding line 17D are disposed at different positions in the front and rear directions of the boom 11.
- the end portions 17E1 and 17E2 of the welding line 17E are also arranged so that the welding position does not overlap with the end portion 13D2 of the welding line 13D, for example. That is, the end portion 13D2 of the welding line 13D and the end portions 17E1, 17E2 of the welding line 17E are arranged at different positions in the front and rear directions of the boom 11.
- Reference numeral 18 denotes a first partition plate as a partition provided inside the boom 11, and the first partition plate 18 is provided between the second web members 12 ⁇ / b> B constituting the left and right web plates 12 and above and below.
- the flange plates 14 and 16 are provided by being joined by means such as fillet welding.
- the upper end of the first partition plate 18 is joined to the intermediate upper flange member 14C of the upper flange plate 14 by means such as fillet welding.
- the lower end of the first partition plate 18 is joined to the third lower flange member 16C of the lower flange plate 16 by means such as fillet welding.
- the left and right ends of the first partition plate 18 are joined to the second web material 12B of the left and right web plates 12 by means such as fillet welding.
- Reference numeral 19 denotes a second partition plate as a partition provided in the boom 11, and the second partition plate 19 is provided between the fourth web members 12 ⁇ / b> D constituting the left and right web plates 12 and above and below.
- the flange plates 14 and 16 are provided by being joined by means such as fillet welding.
- the upper end of the second partition plate 19 is joined to the intermediate upper flange member 14C of the upper flange plate 14 by means such as fillet welding.
- the lower end of the second partition plate 19 is joined to the third lower flange member 16C of the lower flange plate 16 by means such as fillet welding.
- the left and right ends of the third partition plate 19 are joined to the fourth web member 12D of the left and right web plates 12 by means such as fillet welding.
- the boss member 20 is a boss member constituting the boom foot side mounting member. As shown in FIGS. 4 and 5, the boss member 20 includes a cylindrical boss portion 20A extending in the left and right directions and a left and right joint portion 20B integrally formed on both end sides of the boss portion 20A. It is configured. Each joint portion 20B of the boss member 20 is joined to the rear end side of the first web material 12A of the left and right web plates 12 using, for example, a welding means with a back V-shaped groove.
- the rear ends of the upper and lower flange plates 14, 16 (that is, the rear end of the rear upper flange member 14A and the rear end of the first lower flange member 16A) are upward and downward on the boss portion 20A of the boss member 20. It joins using a welding means so that it may pinch
- the boss member 20 is located on the rear end (base end) side of the boom 11 and the rear end of the left and right first web members 12A, the rear end of the rear upper flange member 14A, and the first lower flange member 16A. It is welded between the rear end.
- the boss member 20 constitutes a boom foot part for pin-coupling the base end side of the boom 11 to the revolving frame 4 (see FIG. 1) of the upper revolving structure 3 so as to be able to move up and down.
- the boss member 21 is another boss member which constitutes a boom cylinder mounting member provided in the middle part in the longitudinal direction of the boom 11.
- the boss member 21 includes a cylindrical boss portion 21A extending in the left and right directions, and left and right annular flange portions 21B integrally formed on both end sides of the boss portion 21A. It is comprised by.
- Each annular flange 21B of the boss member 21 is fitted to the third web material 12C of the left and right web plates 12 through a punched hole 12C3 and, for example, a punched hole 12C3 using welding means with a back V-shaped groove. It is joined around.
- the boss 21 ⁇ / b> A of the boss member 21 is pin-coupled so that the rod side of the boom cylinder 11 ⁇ / b> A can rotate.
- the first reference line L1 ⁇ connecting the centers of the boss portion 20A of the boss member 20 and the boss portion 21A of the boss member 21 is taken as the first reference line L1
- a first orthogonal line AA that is orthogonal.
- the third web member 12C located at the center in the front and rear directions has a weld line 13B between the second web member 12B as a counterpart and the first reference line L1. They are arranged in a range close to the first orthogonal line AA so as to have an orthogonal relationship.
- the angle ⁇ 1 formed by the first orthogonal line AA and the weld line 13B is set to an angle of 5 degrees or less (for example, ⁇ 1 ⁇ 4.5 to 4.9 degrees).
- the bracket member 22 is a bracket member constituting an arm side mounting member provided on the front end (tip) side of the boom 11.
- the bracket member 22 includes a pair of left and right bracket portions 22A having a bifurcated shape, and a joint portion 22B that integrally connects the bracket portions 22A.
- the rear ends of the left and right bracket portions 22A are joined to the front end sides of the left and right fifth web members 12E using, for example, welding means using a back V-shaped groove.
- the front end of the upper and lower flange plates 14, 16 (that is, the front end of the front upper flange member 14B and the front end of the sixth lower flange member 16F) is sandwiched in the upper and lower directions at the joint portion 22B of the bracket member 22. They are joined using welding means.
- the bracket member 22 is positioned on the front end (tip) side of the boom 11 and includes the front end of the left and right fifth web members 12E, the front end of the front upper flange member 14B, and the front end of the sixth lower flange member 16F. It is welded between them. As shown in FIG. 1, the base end side of the arm 9 is pin-coupled to such a bracket member 22 so as to be able to move up and down.
- the bracket 23 is another bracket member as an arm cylinder mounting member to which the arm cylinder 9A is coupled.
- the bracket member 23 is formed as a bifurcated bracket and has a pin hole 23A.
- the bracket member 23 is joined to the upper surface side of the intermediate upper flange member 14C of the upper flange plate 14 by using means such as fillet welding. As shown in FIG. 1, the bottom side of the arm cylinder 9A is rotatably coupled to the pin hole 23A of the bracket member 23.
- the hydraulic excavator 1 according to the first embodiment has the above-described configuration, and the operation thereof will be described next.
- the boom cylinder 11A and the arm cylinder 9A are expanded and contracted to raise and lower the boom 11 and the arm 9.
- the earth and sand excavation work is performed by rotating the bucket 10 with the bucket cylinder 10A while moving it.
- the manufacturing process of the boom 11 that constitutes the working arm of the working device 8 together with the arm 9 will be described with reference to FIGS.
- the left and right web plates 12 and the upper and lower flange plates 14 and 16 constituting the boom 11 are manufactured by press molding in separate processes.
- the left and right web plates 12 are welded to the first to fifth web members 12A to 12E formed in different shapes by press molding as shown in FIG. Join along the lines 13A, 13B, 13C, 13D in the front and rear direction by butt welding of V-shaped groove.
- the first web material 12A is bent so as to warp outward in the left and right directions at the position of the folding line 12A1 closer to the front side in the press molding stage before joining to the second web material 12B. Keep it.
- the upper flange plate 14 is formed in a different shape by press molding.
- the rear upper flange member 14A, the intermediate upper flange member 14C, and the front upper flange member 14B are butt welded with V-shaped grooves along the welding lines 15A and 15B.
- the upper flange plate 14 is joined to the upper flange plate 14 with the intermediate upper flange member 14C along the weld lines 15A and 15B between the rear upper flange member 14A and the front upper flange member 14B.
- the rear upper flange member 14A and the intermediate upper flange member 14C of the upper flange plate 14 are bent into a shape along the arc-shaped contour line on the upper end side of the web plate 12.
- the lower flange plate 16 is subjected to roll processing before plate joining to the third lower flange member 16C among the first lower flange member 16A to the sixth lower flange member 16F formed in different shapes by press molding.
- the third lower flange member 16 ⁇ / b> C is bent into a shape along the arcuate contour line on the lower end side of the web plate 12.
- the rear end of the fourth lower flange member 16D is integrated with the front end of the third lower flange member 16C by butt welding of the V-shaped groove along the welding line 17A. To be joined.
- the joined body of the first lower flange member 16A, the second lower flange member 16B, the third and fourth lower flange members 16C, 16D of the lower flange plate 16, the fifth lower flange member 16E, and the sixth lower flange member 16F are Without being joined to each other, it is kept waiting at a predetermined position until the final stage of the can assembly work of the boom 11 (lower flange plate can assembly process shown in FIG. 8).
- the left and right web plates 12 and the upper flange plate 14 are temporarily fixed on the can assembling jig 24 prepared in advance.
- the upper flange plate 14 composed of the rear upper flange member 14A, the front upper flange member 14B, and the intermediate upper flange member 14C is fixed to the upper end sides of the left and right web plates 12 in a form of being temporarily fixed by welding. .
- the weld lines 13A, 13B, 13C and 13D of the web plate 12 do not overlap the weld positions of the weld lines 15A and 15B of the upper flange plate 14 with the end portions 13A1, 13B1 of the weld lines 13A to 13D.
- 13C1 and 13D1 and the end portions 15A1 and 15B1 (end portions 15A2 and 15B2) of the weld lines 15A and 15B are arranged at positions alternately in the front and rear directions of the boom 11.
- first and second partition plates 18 and 19 are disposed between the left and right web plates 12 and the upper flange plate 14 so as to be temporarily fixed by welding. That is, the first partition plate 18 is temporarily fixed by partial welding between the left and right second web members 12B and the rear side of the intermediate upper flange member 14C. The second partition plate 19 is temporarily fixed by partial welding between the left and right fourth web members 12D and the front side of the intermediate upper flange member 14C.
- boss member 20 on the boom foot side is temporarily fixed to the front and rear rear end sides (rear end side) of the left and right web plates 12 and the upper flange plate 14 by welding.
- a boss member 21 for the boom cylinder 11A located temporarily between the left and right third web members 12C is temporarily fixed to the intermediate portion in the length direction by welding. That is, the annular flange 21B of the boss member 21 is temporarily fixed to the punched hole 12C3 of the third web material 12C by welding.
- the bracket member 22 for the arm 9 is temporarily fixed to the front end side in the front and rear directions of the left and right web plates 12 and the upper flange plate 14 by welding, and on the upper surface side of the intermediate upper flange member 14C. Temporarily fixes the bracket member 23 for the arm cylinder 9A by welding.
- the boom can assembly 31 which is a preliminary assembly of the boom 11 is manufactured using the can assembly jig 24 shown in FIG.
- the boom can assembly 31 includes the left and right web plates 12, the upper flange plate 14, the first and second partition plates 18 and 19, the boss members 20 and 21, and the bracket members 22 and 23 by temporary fixing. Can assembled.
- the boom can assembly 31 is set between a pair of rotary positioners 25 prepared in advance. Next, the boom can assembly 31 is rotated in the direction of arrow C in FIG. 7 by the pair of rotary positioners 25, and the boom can assembly 31 is internally welded. That is, internal welding over the entire length in the front and rear directions is performed at the joint portion between the left and right web plates 12 and the upper flange plate 14.
- the first partition plate 18 is internally welded by means such as fillet welding at the joint between the left and right second web members 12B and the rear side of the intermediate upper flange member 14C.
- the second partition plate 19 is also internally welded by means such as fillet welding at the joint between the left and right fourth web members 12D and the front side of the intermediate upper flange member 14C.
- the boss member 20 on the boom foot side performs internal welding on the joint portion between the left and right first web members 12A and the rear upper flange member 14A, and the boss member 21 for the boom cylinder 11A is also left, Internal welding is performed on the joint portion with the right third web member 12C, and both are fixed by welding.
- the bracket member 22 for the arm 9 is subjected to internal welding at the joining portion between the left and right fifth web members 12E and the front upper flange member 14B to fix them together.
- the joined body of the third lower flange member 16C and the fourth lower flange member 16D that are joined in advance is used as the left and right of the boom can assembly 31.
- the web plate 12 is joined by welding so as to partially close the lower end side of the intermediate portion in the longitudinal direction.
- the lower end of the first partition plate 18 is joined to the inner surface of the third lower flange member 16C by means such as fillet welding.
- the second partition plate 19 is also joined at its lower end side to the inner side surface of the third lower flange member 16C by means such as fillet welding.
- the second lower flange member 16B and the sixth lower flange member 16F of the lower flange plate 16 are welded and joined to the left and right web plates 12 so as to partially close the lower ends thereof.
- the rear end portion of the second lower flange member 16B is joined along the weld line 17B (see FIG. 9) to the front end portion of the third lower flange member 16C, and the two are brought into contact with each other at the position of the weld line 17B.
- both sides are welded on the inside and outside.
- the front end portion of the sixth lower flange member 16F is joined to the joint portion 22B of the bracket member 22 by double-sided welding between the inside and the outside in a state of butting in the front and rear directions.
- the first lower flange member 16A and the fifth lower flange member 16E are welded and joined to the left and right web plates 12 so as to close the lower ends thereof, and the can of the lower flange plate 16 is joined.
- Complete the assembly process That is, at the stage where the joining operation of the first lower flange member 16A and the fifth lower flange member 16E is completed, the lower end sides of the left and right web plates 12 are substantially closed over the entire length in the front and rear directions. .
- the rear end of the first lower flange member 16A is joined to the front end of the second lower flange member 16B along the weld line 17C (see FIG. 9).
- the rear end of the fifth lower flange member 16E is joined along the weld line 17D to the front end of the fourth lower flange member 16D, and the front end of the fifth lower flange member 16E is the sixth lower flange. It joins along the welding line 17E to the rear side edge part of the material 16F.
- butt welding with a V-shaped groove using a backing material is performed at the positions of the welding lines 17D and 17E, respectively, in an external welding process described later.
- the rear end of the first lower flange member 16A and the front end of the second lower flange member 16B are joined along the weld line 17C. Butt welding with a V-shaped groove using a backing material (not shown) in position is completed.
- the rear end portion of the fifth lower flange member 16E and the front end portion of the fourth lower flange member 16D are also joined along the weld line 17D, and the front end portion of the fifth lower flange member 16E is connected to the sixth end portion.
- the lower flange member 16F is also joined to the rear end portion along the weld line 17E. Butt welding with a V-shaped groove using a backing material (not shown) is also completed at the positions of these welding lines 17D and 17E.
- the boom 11 is completed as a welded structure composed of a long box-shaped structure by an external welding process using the welding robot 26. Thereafter, the boom 11 is transported to the assembly process of the working device 8 and assembled together with the arm 9 as a working arm of the working device 8 shown in FIG.
- the left and right web plates 12 of the boom 11 are combined with a total of five first to fifth web members 12A to 12E having different shapes from each other in the front and rear ends. It can be formed by joining along the weld lines 13A to 13D at the part.
- a total of three rear upper flange members 14A, front upper flange members 14B, and intermediate upper flange members 14C having different shapes are joined along the weld lines 15A and 15B at the front and rear ends.
- the lower flange plate 16 is formed by joining a total of six first to sixth lower flange members 16A to 16F of different shapes along the weld lines 17A to 17E at the front and rear end portions. can do.
- a boom structure 11 having a rectangular cross section is formed.
- the upper ends 13A1, 13B1, 13C1 and 13D1 of the weld lines 13A to 13D between the respective plate members constituting the left and right web plates 12 are used as the weld lines 15A between the respective plate members constituting the upper flange plate 14.
- 15B end portions 15A1 and 15B1 can be arranged at different positions in the front and rear directions, respectively.
- the lower end portions 13A2, 13B2, 13C2, 13D2 ⁇ ⁇ of the weld lines 13A to 13D are used as the end portions 17A1, 17B117, 17C1 of the weld lines 17A to 17E between the plate members constituting the lower flange plate 16, respectively.
- 17D1, 17E1 ends 17A2, 17B2, 17C2, 17D2, 17E2 can be arranged at different positions in the front and rear directions, respectively.
- the first web material 12A to which the boss member 20 on the boom foot side is joined, and the third web plate 12C positioned at the center most in the front and rear directions are: Use thick material.
- the second web material 12B, the fourth web material 12D, and the fifth web material 12E other than this can be made of a material that is thinner than the first web material 12A and the third web material 12C.
- the first web member 12A can support the boss member 20 on the boom foot side together with the rear upper flange member 14A of the upper flange plate 14 and the first lower flange member 16A of the lower flange plate 16 with a sturdy structure.
- the support strength on the boom foot side can be increased.
- the left and right third web members 12C can support the boss member 21 to which the rod side of the boom cylinder 11A is pivotally coupled by a sturdy structure, and can increase the support strength for the boom cylinder 11A. .
- the third web member 12C out of a total of five plate members constituting the left and right web plates 12 has a weld line 13B joined to the end of the second web member 12B. It can be arranged at a position close to an orthogonal line AA orthogonal to the first reference line L1. For this reason, the second web member 12B and the third web against the stress generated in the left and right web plates 12 between the boss member 21 and the boom foot-side boss member 20 due to the expansion and contraction operation of the boom cylinder 11A.
- the joining strength at the position along the welding line 13B with the material 12C, that is, the welding strength can be increased, and the welding life and reliability can be improved.
- the third web member 12C can be arranged at a position close to the orthogonal line BB perpendicular to the second reference line L2 with the weld line 13C joined to the end of the fourth web member 12D.
- the third web member 12 ⁇ / b> C against the stress generated in the left and right web plates 12 between the boss member 21 and the bracket member 23 due to the expansion / contraction operation of the arm cylinder 9 ⁇ / b> A and the expansion / contraction operation of the boom cylinder 11 ⁇ / b> A.
- the fourth web member 12D at the position along the weld line 13C that is, the welding strength can be increased, and the welding life and reliability can be improved.
- the first partition is located between the upper and lower flange plates 14 and 16 between the second web members 12B of the left and right web plates 12 made of the first to fifth web members 12A to 12E.
- the plate 18 can be provided by welding, and the first partition plate 18 can increase the joining strength by welding between the left and right web plates 12 and the upper and lower flange plates 14 and 16. it can.
- a second partition plate 19 can be provided between the upper and lower flange plates 14 and 16, and the second partition plate 19 can be provided. The plate 19 can increase the bonding strength by welding between the left and right web plates 12 and the upper and lower flange plates 14 and 16.
- the left and right web plates 12 and the upper and lower flange plates 14 and 16 can be formed of a plate material having a necessary minimum plate thickness, which reduces the material cost. It is possible to reduce the weight of the boom 11 as a whole. Accordingly, the boom cylinder 11A can be configured with a smaller hydraulic cylinder. In addition, the inertial force when the boom 11 is lifted and lowered by the boom cylinder 11A can be reduced, and the positioning performance when the boom 11 is stopped at an arbitrary position can be improved.
- FIG. 10 shows a second embodiment of the present invention.
- the feature of the second embodiment is that the left web plate and the right web plate are formed by a total of six plate members, the upper flange plate is formed by a total of four plate members, and the lower flange plate is a total of seven plate members. It is to be formed by.
- the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.
- reference numeral 41 denotes a boom employed in the second embodiment, and the boom 41 is configured in substantially the same manner as the boom 11 described in the first embodiment.
- the boom 41 extends in the length direction (front and rear) and is opposed to each other in the left and right directions, and a pair of left and right web plates 42 and 42 and the upper and lower ends of each web plate 42 are welded to each other. From the joined upper and lower flange plates 43 and 44, a box-shaped structure having a closed cross-sectional structure with a square cross section is formed.
- the left and right web plates 42 are different from those of the first embodiment in that they are formed by a total of six plate materials. That is, the web plate 42 includes first to fourth web members 42A to 42D formed in the same manner as the first to fourth web members 12A to 12D described in the first embodiment, a fifth web member 42E, and The sixth web member 42F is composed of a total of six plate members.
- the fifth web member 42E and the sixth web member 42F are formed by dividing the fifth web member 12E described in the first embodiment into two plate members. The front end of the fifth web member 42E is joined to the rear end side of the sixth web member 42F along a weld line (not shown).
- the first web material 42A of the web plate 42 is warped outward in the left and right directions at the position of the folding line 42A1 on the front side, similarly to the first web material 12A described in the first embodiment. It is bent. Further, the third web material 42C is similar to the third web material 12C described in the first embodiment, and the upper and lower ends thereof are arc-shaped edges 42C1 and 42C2, and the edges 42C1 and 42C2 Between them, a circular punching hole 42C3 is formed, to which the annular flange 21B of the boss member 21 is joined by welding.
- the upper flange plate 43 is different from the first embodiment in that it is formed of a total of four plate materials. That is, the upper flange plate 43 includes a first upper flange member 43A located on the rear end side of the entire length of the upper flange plate 14, a second upper flange member 43B located on the front side thereof, and a third piece located on the front side thereof.
- the upper flange member 43 ⁇ / b> C and a fourth upper flange member 43 ⁇ / b> D located on the front side thereof are constituted by a total of four plate members.
- the first upper flange member 43A is configured in the same manner as the rear upper flange member 14A described in the first embodiment, and the second upper flange member 43B is the intermediate upper member described in the first embodiment.
- the configuration is the same as the flange material 14C.
- the third upper flange member 43C and the fourth upper flange member 43D are formed by dividing the front upper flange member 14B described in the first embodiment into two plate members. The front end of the third upper flange member 43C is joined to the rear end of the fourth upper flange member 43D along a weld line (not shown).
- the lower flange plate 44 is different from that of the first embodiment in that it is formed of a total of seven plate materials. That is, the lower flange plate 44 includes first to fourth lower flange members 44A to 44D formed in the same manner as the first to fourth lower flange members 16A to 16D described in the first embodiment, and a fifth lower plate. It is composed of a total of seven plate members including a flange member 44E, a sixth lower flange member 44F, and a seventh lower flange member 44GE.
- the fifth lower flange member 44E and the sixth lower flange member 44F of the lower flange plate 44 are two of the fifth lower flange members 16E of the lower flange plate 16 described in the first embodiment. This is different from the form of the first embodiment in this point.
- the front end of the fifth lower flange member 44E is joined to the rear end of the sixth lower flange member 44F along a weld line (not shown).
- the seventh lower flange member 44G of the lower flange plate 44 is formed in the same manner as the sixth lower flange member 16F of the lower flange plate 16 described in the first embodiment.
- first to sixth web members 42A to 42F constituting the left and right web plates 42 and the first to fourth upper flange members 43A to 43D constituting the upper flange plate 43.
- the end portions of the weld lines are arranged at different positions in the front and rear directions.
- first to sixth web members 42A to 42F constituting the left and right web plates 42 and the first to seventh lower flange members 44A to 44G constituting the lower flange plate 44.
- the end portions of the weld lines are arranged at different positions in the front and rear directions.
- the left and right web plates 42 and the upper and lower flange plates 43 and 44 can be formed of a plate material having a necessary minimum thickness.
- substantially the same effects as those of the first embodiment can be obtained.
- the left and right web plates 42 are formed of six plates, the upper flange plate 43 is formed of four plates, and the lower flange plate 44 is formed of seven plates.
- the case of forming was described as an example. However, the present invention is not limited to this.
- the left and right web plates are formed of seven plates, the upper flange plate is formed of three plates, and the lower flange plate is formed of six plates. Also good.
- the left and right web plates may be formed of five plates, the upper flange plate may be formed of, for example, four plates, and the lower flange plate may be formed of six plates.
- the left and right web plates may be formed of five plate members, the upper flange plate may be formed of four plate members, and the lower flange plate may be formed of six plate members. That is, according to the present invention, the left and right web plates are formed of at least five plates, the upper flange plate is formed of at least three plates, and the lower flange plate is formed of at least six plates. What should I do?
- the boom 11 provided in the hydraulic excavator 1 is described as an example as a representative example of the construction machine.
- the present invention is not limited to this, and can also be applied to a boom as a work arm used in other construction machines such as a wheel-type hydraulic excavator.
Abstract
Description
左,右のウェブ板12(図4、図5中では一方のみ図示)は、プレス成形により互いに異なる形状に形成された第1~第5ウェブ材12A~12Eを、図5に示すように溶接線13A,13B,13C,13Dに沿ってV型開先の突合せ溶接により前,後方向で接合する。この場合、第1ウェブ材12Aについては、第2ウェブ材12Bと接合する前にプレス成形の段階において、前側寄りの折曲げ線12A1 の位置で左,右方向の外側に反るように折曲げておく。
次に、図6に示す缶組み工程では、予め用意した缶組み治具24の上に、左,右のウェブ板12と上フランジ板14とを仮止めするように配置する。この場合、後上フランジ材14A、前上フランジ材14Bおよび中間上フランジ材14Cからなる上フランジ板14は、左,右のウェブ板12の上端側に溶接により仮止めするかたちで固定しておく。このとき、ウェブ板12の溶接線13A,13B,13Cおよび13Dは、上フランジ板14の溶接線15A,15Bと溶接位置が重なることがないように、溶接線13A~13Dの端部13A1 ,13B1 ,13C1 ,13D1 と溶接線15A,15Bの端部15A1 ,15B1 (端部15A2 ,15B2 )とは、ブーム11の前,後方向で互い違いとなる位置に配置されている。
図7に示す内部溶接工程では、予め用意した一対の回転ポジショナ25の間にブーム缶組体31をセットする。次に、一対の回転ポジショナ25によりブーム缶組体31を図7中の矢示C方向に回転させ、ブーム缶組体31に内部溶接を施す。即ち、左,右のウェブ板12と上フランジ板14との接合部位に前,後方向の全長にわたる内部溶接を行う。第1の仕切板18には、左,右の第2ウェブ材12B間と中間上フランジ材14Cの後部側との接合部位に隅肉溶接等の手段で内部溶接を行う。第2の仕切板19についても、左,右の第4ウェブ材12D間と中間上フランジ材14Cの前部側との接合部位に隅肉溶接等の手段で内部溶接を行う。
次に、図8に示す下フランジ板16の缶組み工程では、予め接合された第3下フランジ材16Cと第4下フランジ材16Dとの接合体を、ブーム缶組体31の左,右のウェブ板12に対し、その長さ方向中間部の下端側を部分的に閉塞するように溶接により接合する。このとき、第1の仕切板18は、その下端側を第3下フランジ材16Cの内側面に隅肉溶接等の手段により接合する。第2の仕切板19についても、その下端側を第3下フランジ材16Cの内側面に隅肉溶接等の手段により接合する。
次に、図9に示すように、溶接工程の最終段階である外部溶接を複数台の溶接ロボット26を用いて行う。この外部溶接工程では、溶接ロボット26により左,右のウェブ板12と上フランジ板14との間を前,後方向の全長にわたって隅肉溶接する。同様に、左,右のウェブ板12と下フランジ板16との間も前,後方向の全長にわたって隅肉溶接する。一方、上フランジ板14のうち中間上フランジ材14Cの上面側には、予め仮止めされたブラケット部材23を隅肉溶接により強固に接合する。
8 作業装置
11,41 ブーム
12,42 ウェブ板
12A,42A 第1ウェブ材(後端側の板材)
12B,42B 第2ウェブ材(板材)
12C,42C 第3ウェブ材(中央に位置する板材)
12D,42D 第4ウェブ材(板材)
12E,42E 第5ウェブ材(板材)
13A~13D ウェブ板の溶接線
13A1 ,13B1 ,13C1 ,13D1 端部
13A2 ,13B2 ,13C2 ,13D2 端部
14,43 上フランジ板
14A 後上フランジ材(板材)
14B 前上フランジ材(板材)
14C 中間上フランジ材(板材)
15A,15B 上フランジ板の溶接線
15A1 ,15B1 ,15A2 ,15B2 端部
16,44 下フランジ板
16A~16F,44A~44F 第1~第6下フランジ材(板材)
17A~17E 下フランジ板の溶接線
17A1 ,17B1 ,17C1 ,17D1 ,17E1 端部
17A2 ,17B2 ,17C2 ,17D2 ,17E2 端部
18 第1の仕切板
19 第2の仕切板
20 ボス部材(ブームフート側取付部材)
21 ボス部材(ブームシリンダ取付部材)
22 ブラケット部材(アーム側取付部材)
23 ブラケット部材(アームシリンダ取付部材)
24 缶組み治具
31 ブーム缶組体
42F 第6ウェブ材
43A~43D 第1~第4上フランジ材(板材)
44G 第7下フランジ材(板材)
Claims (5)
- 左,右のウェブ板(12,42)と、該左,右のウェブ板(12,42)の上端側に溶接により接合される上フランジ板(14,43)と、前記左,右のウェブ板(12,42)の下端側に溶接により接合される下フランジ板(16,44)とを備え、前記左,右のウェブ板(12,42)と前記上,下のフランジ板(14,43),(16,44)とにより横断面が四角形の閉断面構造をなす箱型構造体として形成される建設機械用ブームにおいて、
前記左ウェブ板(12,42)と右ウェブ板(12,42)とは、互いに形状が異なる少なくとも合計5枚の板材(12A~12E,42A~42F)を前,後方向の端部で溶接線(13A~13D)に沿ってそれぞれ接合することにより形成し、
前記上フランジ板(14,43)は、互いに形状が異なる少なくとも合計3枚の板材(14A~14C,43A~43D)を前,後方向の端部で溶接線(15A,15B)に沿ってそれぞれ接合することにより形成し、
前記下フランジ板(16,44)は、互いに形状が異なる少なくとも合計6枚の板材(16A~16F,44A~44G)を前,後方向の端部で溶接線(17A~17E)に沿ってそれぞれ接合することにより形成し、
前記上フランジ板(14,43)を構成する各板材(14A~14C,43A~43D)間の溶接線(15A,15B)の端部(15A1 ,15B1 ,15A2 ,15B2 )と前記左,右のウェブ板(12,42)を構成する各板材(12A~12E,42A~42F)間の溶接線(13A~13D)の端部(13A1 ~13D1 ,13A2 ~13D2 )とは、前,後方向で互いに異なる位置に配置し、
前記下フランジ板(16,44)を構成する各板材(16A~16F,44A~44G)間の溶接線(17A~17E)の端部(17A1 ~17E1 ,17A2 ~17E2 )と前記左,右のウェブ板(12,42)を構成する各板材(12A~12E,42A~42F)間の溶接線(13A~13D)の端部(13A1 ~13D1 ,13A2 ~13D2 )とは、前,後方向で互いに異なる位置に配置する構成としたことを特徴とする建設機械用ブーム。 - 前記左,右のウェブ板(12)間には、前,後方向の後端側に位置して前記上,下のフランジ板(14,16)間に溶接されるブームフート側取付部材(20)を設けると共に、前記合計5枚の板材(12A~12E)のうち前,後方向で最も中央に位置する板材(12C)に溶接されブームシリンダ(11A)が回動可能に連結されるブームシリンダ取付部材(21)を設け、
前記左,右のウェブ板(12)を構成する合計5枚の板材(12A~12E)のうち前記ブームフート側取付部材(20)が溶接される前記後端側の板材(12A)と前記中央に位置する板材(12C)とは、他の3枚の板材(12B,12D,12E)よりも板厚を厚くする構成としてなる請求項1に記載の建設機械用ブーム。 - 前記左,右のウェブ板(12)間には、前,後方向の後端側に位置して前記上,下のフランジ板(14,16)間に溶接されるブームフート側取付部材(20)を設けると共に、前記合計5枚の板材(12A~12E)のうち前,後方向で最も中央に位置する板材(12C)に溶接されブームシリンダ(11A)が回動可能に連結されるブームシリンダ取付部材(21)を設け、
前記上フランジ板(14)には、前記ブームシリンダ取付部材(21)よりも前側となる位置でかつ前記合計3枚の板材(14A~14C)のうち中央に位置する板材(14C)の上面に位置しアームシリンダ(9A)が回動可能に連結されるアームシリンダ取付部材(23)を設け、
前記左,右のウェブ板(12)の前記中央に位置する板材(12C)は、その前,後方向の後側の溶接線(13B)を、前記ブームフート側取付部材(20)と前記ブームシリンダ取付部材(21)とを結ぶ第1の基準線(L1)にほぼ直交する関係に配置し、前,後方向の前側の溶接線(13C)を、前記ブームシリンダ取付部材(21)と前記アームシリンダ取付部材(23)とを結ぶ第2の基準線(L2)にほぼ直交する関係に配置する構成としてなる請求項1に記載の建設機械用ブーム。 - 前記左,右のウェブ板(12)は、前,後方向の後端側に位置する第1ウェブ材(12A)と、後側の端部が該第1ウェブ材(12A)の前側の端部に接合される第2ウェブ材(12B)と、後側の端部が該第2ウェブ材(12B)の前側の端部に接合される第3ウェブ材(12C)と、後側の端部が該第3ウェブ材(12C)の前側の端部に接合される第4ウェブ材(12D)と、後側の端部が該第4ウェブ材(12D)の前側の端部に接合される第5ウェブ材(12E)とからなる合計5枚の板材(12A~12E)によりそれぞれ構成し、
前記左,右のウェブ板(12)を構成する前記第2ウェブ材(12B)間には、前記上,下のフランジ板(14,16)間に位置して第1の仕切板(18)を設け、前記第4ウェブ材(12D)間には、前記上,下のフランジ板(14,16)間に位置して第2の仕切板(19)を設ける構成としてなる請求項1に記載の建設機械用ブーム。 - 前記左,右のウェブ板(12,42)には、前,後方向の前端側に位置して前記上,下のフランジ板(14,43),(16,44)間に溶接されるアーム側取付部材(22)を設ける構成としてなる請求項1に記載の建設機械用ブーム。
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CN201180069057.1A CN103403263B (zh) | 2011-04-20 | 2011-04-20 | 工程机械用起重臂 |
US13/994,821 US20140056677A1 (en) | 2011-04-20 | 2011-04-20 | Boom for construction machine |
PCT/JP2011/059748 WO2012144037A1 (ja) | 2011-04-20 | 2011-04-20 | 建設機械用ブーム |
EP11863797.4A EP2700752A4 (en) | 2011-04-20 | 2011-04-20 | BOOM FOR A CONSTRUCTION MACHINE |
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