JP2006028776A - End structure of working link, and end structure of boom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an end structure of a working link, which hardly causes a weld defect due to an inclination of bulkhead plating, which facilitates positioning of the bulkhead plating, and which reduces welding operations. <P>SOLUTION: A reinforcing plate 15 comprises the flat plate-shaped bulkhead plating 14, and left and right side plate parts 15a and 15b which are elongated backward from the bulkhead plating 14. Welding brings about integration in a state wherein the side of the bulkhead plating 14 is inserted between upper and lower plate parts 13b and 13c of an end closing plate 13 and between bracket side plates 11 and 12; end surfaces on the side of rear stepped parts 13d and 13e of the closing plate 13 are butt-welded to end surfaces of upper and lower plates 1 and 2 of a boom body 5; and end surfaces of the side plate parts 15a and 15b of the reinforcing plate 15 are butt-welded to those of left and right side plates 3 and 4 of the boom body 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an end structure of a work link, and in particular, a working machine in which a connecting bracket portion is integrally joined to one end of a link main body formed by an upper plate, a lower plate, and left and right side plates such as a boom of a hydraulic excavator. The present invention relates to an end structure of a link and an end structure of a boom.

  As an example of the end structure of a conventional work link, there is an end structure of a boom of a hydraulic excavator described in Japanese Utility Model Laid-Open No. 5-10541, for example. This end structure of the boom is constructed by integrally joining a connecting bracket portion to the end of a link main body (boom main body) formed by an upper plate, a lower plate, and left and right side plates.

  The connecting bracket part is made of forged or thick plate left and right bracket side plates, bent plate structure end closing plates, link left and right brackets to improve rigidity against bending and torsion. It is comprised by the flat reinforcement board (partition board) arrange | positioned so that it may be enclosed with a side plate and an edge part closing plate.

  The end closing plate includes a bent plate portion constituting the closed end portion, and an upper plate portion and a lower plate portion extending rearward from the bent plate portion, and the upper plate portion and the lower plate portion from the bent plate portion of the end closing plate. The left and right end edge portions are welded to the inner surfaces of the left and right bracket side plates over a part of the plate portion, thereby being integrally joined between the left and right bracket side plates.

  The reinforcing plate (partition plate on the flat plate) welds the upper and lower end edges of the reinforcing plate to the inner surfaces of the upper and lower plate portions of the end closing plate, By welding the inner surface of the bracket side plate, the left and right bracket side plates and the end closing plate are integrally joined.

  With the left and right bracket side plates, end closing plates, and reinforcing plates integrated in this way, the rear end edges of the left and right bracket side plates are butted against the front end edges of the left and right side plates of the link body. The end edge portions of the upper plate portion and the lower plate portion of the end closing plate are joined to the link main body integrally by butt welding to the upper end edge portions of the upper and lower plates of the link main body.

Japanese Utility Model Publication No. 5-10541

  As described above, the end structure of the conventional work link is a partition plate that is surrounded by the left and right bracket side plates and the end closing plate in order to improve the rigidity against bending and torsion at the link tip. Is arranged. However, since this partition plate has a flat plate shape, when it is joined to the surrounding bracket side plate and the end closing plate by welding, there is no pressing and the wall plate easily falls. If the partition plate is tilted and tilted to some extent, a gap is formed between the surrounding bracket side plate and the end closing plate. Therefore, when welding is performed in this state, a terminal weld portion is formed and defects are likely to occur.

  Moreover, since the partition plate is disposed on the back side of the enclosed space in a state surrounded by the left and right bracket side plates and the end closing plate, it is difficult to locate the mounting position. As a result, it took time to adjust the position of the partition plate. In addition, it is necessary to add a jig or a member for adjusting the inclination and positioning of the partition plate.

  An object of the present invention is to provide an end structure of a work link and an end structure of a boom which are less likely to cause a welding defect due to the inclination of the partition plate, can easily position the partition plate, and can shorten the welding operation. It is.

  (1) In order to achieve the above object, the present invention provides an end structure of a work machine link in which a connection bracket portion is integrally joined to one end of a link body formed by an upper plate, a lower plate, and left and right side plates. The connecting bracket portion is positioned between the left and right bracket side plates, the left and right bracket side plates, the end closing plate closing the tip opening of the link body, and the left and right bracket side plates and the end portions. It consists of a reinforcing plate that improves the rigidity against bending and torsion at the end of the link by a flat partition wall part surrounded on all sides by the closing plate, and the end closing plate constitutes the closing end A bent plate portion, and an upper plate portion and a lower plate portion extending rearward from the bent plate portion, each having a U-shaped longitudinal section, and the reinforcing plate includes the flat plate-shaped partition plate portion and the partition plate portion. Left and right extending backward from The end plate is integrated with the left and right bracket side plates by welding, and the reinforcing plate is between the upper plate portion and the lower plate portion of the end plate. The partition plate portion side is inserted between the left and right bracket side plates, and the left and right bracket side plates and the end closing plate are integrated by welding.

  In this way, the reinforcing plate is formed into a U-shaped horizontal section by the partition plate portion and the left and right side plate portions, and the partition plate portion side of the reinforcing plate is placed between the upper plate portion and the lower plate portion of the end closing plate and between the left and right sides. In the state inserted between the bracket side plates, the left and right bracket side plates and the end closing plate are integrated by welding so that the left and right side plate portions of the reinforcing plate are the surrounding members (the upper plate portion of the end closing plate and The partition plate is prevented from falling by being supported by the lower plate portion and the left and right bracket side plates), the occurrence of unwelded portions during welding due to the inclination of the partition plate is reduced, and welding defects are less likely to occur. In addition, since the position of the partition plate can be adjusted by inserting and removing the left and right side plate portions of the reinforcing plate with respect to the surrounding members, only the partition plate is surrounded by the left and right bracket side plates and the end closing plate. Compared with the case where it arrange | positions in the back | inner side, positioning of a partition plate becomes easy, adjustment time of the position of a partition plate is shortened, and shortening of welding operation can be aimed at. Furthermore, since the partition plate does not fall and positioning is easy, it is not necessary to add a member other than the partition plate, such as an adjustment jig.

  (2) In the above (1), preferably, the rear portions of the left and right side plate portions of the reinforcing plate extend to the outside of the left and right bracket side plates, and the rear end portions of the left and right bracket side plates are formed of the reinforcing plate. The left and right bracket side plates, end closing plates and reinforcing plates are joined by welding at the contact portions with the outer surfaces of the left and right side plate portions, and the rear end surfaces of the end closing plates are connected to the upper and lower plates of the link body. The link body is integrated with the link body by welding with the end face of the plate and by welding the end surfaces of the left and right side plate portions of the reinforcing plate with the end surfaces of the left and right side plates of the link body.

  As a result, part of the left and right side plate parts of the reinforcing plate come out of the left and right bracket side plates, making it easier to adjust the position of the partition plate part than when the entire reinforcing plate is placed inside the left and right bracket side plates. Thus, the adjustment time of the position of the partition plate is shortened, and the welding work can be shortened.

  (3) Moreover, in order to achieve the said objective, this invention is the edge part structure of a boom formed by integrally joining a connection bracket part to the front-end | tip of the boom main body formed with the upper board, the lower board, and the right-and-left side board. The connecting bracket portion is positioned between the left and right bracket side plates, the left and right bracket side plates, the end closing plate closing the tip opening of the boom body, and the left and right bracket side plates and the end portions. It consists of a reinforcing plate that improves the rigidity against bending and torsion at the end of the boom by a flat partition wall part surrounded on all sides by the closing plate, and the end closing plate constitutes the closing end A bent plate portion, and an upper plate portion and a lower plate portion extending rearward from the bent plate portion, each having a U-shaped longitudinal section, and the reinforcing plate includes the flat plate-shaped partition plate portion and the partition plate portion. Left and right extending backward from The end plate is integrated with the left and right bracket side plates by welding, and the reinforcing plate is between the upper plate portion and the lower plate portion of the end plate. And the left and right bracket side plates are integrated with the left and right bracket side plates and the end portion closing plate in a state in which the partition plate portion side is partially inserted.

  As a result, as described in (1) above, welding defects due to the inclination of the partition plate are less likely to occur, and the positioning of the partition plate is easy, and the welding operation can be shortened. Further, it is not necessary to add a member other than the partition plate such as an adjustment jig.

  ADVANTAGE OF THE INVENTION According to this invention, in the assembly and welding operation | work of the end part structure of a work link or the end part structure of a boom, it is hard to produce the welding defect by the inclination of a partition plate, and can provide a high quality end part structure.

  Moreover, the positioning of the partition plate is easy, and the welding work can be shortened. Further, it is not necessary to add a member other than the partition plate such as a jig for adjustment, so that the welding equipment can be simplified and the welding operation can be further shortened.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 are views showing an end structure of a boom according to an embodiment of the present invention. FIG. 1 is a top view, FIG. 2 is a side view, and FIG. 3 is a perspective view.

  In FIG. 1 to FIG. 3, the end structure of the work link according to the present embodiment is applied to the tip of the boom of a hydraulic excavator and is cross-sectioned by an upper plate 1, a lower plate 2, and left and right side plates 3 and 4. A connecting bracket portion 6 is integrally joined to one end of a boom body (link body) 5 formed in a rectangular shape by welding. The upper plate 1, the lower plate 2, and the left and right side plates 3, 4 are each a flat plate made of steel, and the left and right side plates 3, 4 are positioned so as to be located inward from both side edges of the upper plate 1 and the lower plate 2. It joins so that it may become a cross-sectional rectangle with respect to the board 1 and the lower board 2, and the both-sides edge part of the upper board 1 and the lower board 2 protrudes slightly from the outer surface of the right-and-left side surfaces 3 and 4. FIG.

  The connecting bracket 6 is positioned between the left and right bracket side plates 11 and 12, the left and right bracket side plates 11 and 12, and the end closing plate 13 that closes the tip opening of the boom body 5, and the left and right bracket side plates 11. , 12 and the end closing plate 13 have a flat partition plate 14 surrounded on all sides, and the partition plate 14 portion enhances the rigidity against bending and torsion at the boom tip. It consists of a plate 15.

  The left and right bracket side plates 11 and 12 are steel plate members made of forged or thick plates, pin holes 11a and 12a are opened at the front end portions, and the bracket side plates 11 and 12 are placed rearward at the rear end portions. Upper and lower inclined surfaces 11b and 12b and linear end surfaces 11c and 12c, which are narrowed toward the end, are provided.

  Each of the end closing plate 13 and the reinforcing plate 15 has a bent plate structure. The end closing plate 13 includes a bent plate portion 13a constituting a closed end portion, and an upper plate portion 13b extending rearward from the bent plate portion 13a. And the lower plate portion 13c are formed in a U-shaped longitudinal section, and the reinforcing plate 15 is horizontally formed by a plate-shaped partition plate 14 portion and left and right side plate portions 15a and 15b extending rearward from the partition plate 14 portion. The cross section is U-shaped. Stepped portions 13d and 13e that are wider than the other portions are formed at the rear end portions of the upper plate portion 13b and the lower plate portion 13c of the end closing plate 13.

  The end closing plate 13 is integrated by welding between the left and right bracket side plates 11 and 12, and the reinforcing plate 15 is provided between the upper plate portion 13 b and the lower plate portion 13 c of the end closing plate 13 and between the left and right bracket side plates 11, 12. In a state in which the partition plate 14 portion side is inserted between 12, the left and right bracket side plates 11, 12 and the end closing plate 13 are integrated by welding. The rear portions of the left and right side plate portions 15 a and 15 b of the reinforcing plate 15 extend to the outside of the left and right bracket side plates 11 and 12, and the linear end surfaces 11 c and 12 c at the rear of the left and right bracket side plates 11 and 12 are the reinforcing plate 15. The left and right side plate portions 15a and 15b are joined by welding at the contact portions with the outer surfaces. The linear end surfaces 11c and 12c of the left and right bracket side plates 11 and 12 have substantially the same size (width in the vertical direction in FIG. 2) as the size (width) at the welded portion of the left and right side plate portions 15a and 15b of the reinforcing plate 15. Have.

  Furthermore, the end surfaces of the end closing plate 13 on the rear stepped portions 13 d and 13 e side are welded to end surfaces of the upper plate 1 and the lower plate 2 of the boom body 5, and the left and right side plate portions 15 a and 15 b of the reinforcing plate 15 are welded. The end surfaces are attached and welded to the end surfaces of the left and right side plates 3 and 4 of the boom body 5, whereby the left and right bracket side plates 11 and 12, the end closing plate 13 and the reinforcing plate 15 are integrated with the boom body 5. The stepped portions 13d and 13e of the end closing plate 13 have shapes and dimensions that are continuous with the upper plate 1 and the lower plate 2 of the boom body 5 at the butting portions (welded portions), and the left and right side plate portions of the reinforcing plate 15 15a and 15b have a shape and a dimension which are continuous with the left and right side plates 4 and 5 of the boom main body 5 at a butting portion (welded portion). As a result, the width of the reinforcing plate 15 has a dimension that matches the distance between the outer surfaces of the left and right side plates 4, 5 of the boom body 5.

  4 and 5 show details of the welded portion. The detail of a welding part is demonstrated with a welding procedure using FIG.4 and FIG.5.

  First, the end closing plate 13 is sandwiched between the left and right bracket side plates 11 and 12, and the bent portion 13a of the end closing plate 13 to the portions other than the stepped portions 13d and 13e of the upper plate portion 13b and the lower plate portion 13c. Then, fillet welds are made from the outside of the end closing plate 13 at the contact portions between the left and right edge portions of the end closing plate 13 and the inner surfaces of the left and right bracket side plates 11 and 12 (A and B in FIGS. 4 and 5). ). Next, the rear inclined end surfaces 11b and 12b of the left and right bracket side plates 11 and 12 are welded to the stepped portions 13d and 13e of the end closing plate 13 (C and D in FIGS. 4 and 5). Next, the partition plate 14 side of the reinforcing plate 15 is partially inserted between the upper plate portion 13b and the lower plate portion 13c of the end closing plate 13 and between the left and right bracket side plates 11 and 12, and the partition wall of the reinforcing plate 15 is inserted. From the plate 14 portion to the left and right side plate portions 15a, 15b, contact portions between the upper and lower end surfaces of the reinforcing plate 15 and the inner surfaces of the upper plate portion 13b and the lower plate portion 13c of the end closing plate 13 are corners from the inner side of the reinforcing plate 15. 4 and FIG. 5, and contact portions between the straight rear end surfaces 11 c and 12 c of the left and right bracket side plates 11 and 12 and the outer surfaces of the left and right side plate portions 15 a and 15 b of the reinforcing plate 15. Is fillet welded from the outside of the reinforcing plate 15 (G and H in FIGS. 4 and 5).

  As described above, the left and right bracket side plates 11 and 12, the end closing plate 13 and the reinforcing plate 15 are integrated by welding. Thereafter, the end surfaces of the stepped portions 13d and 13e of the upper plate portion 13b and the lower plate portion 13c of the end closing plate 13 are butted against the rear end surfaces of the upper plate 1 and the lower plate 2 of the boom body 5, and the reinforcing plate 15 The rear end surfaces of the left and right side plate portions 15a, 15b are butted against the end surfaces of the left and right side plates 3, 4 of the boom body 5, and the butted portions are welded (butt welding) (I, J, K, L in FIGS. 4 and 5). Further, the contact portions between the upper and lower end surfaces of the left and right side plate portions 15a and 15b of the reinforcing plate 15 and the inner surfaces of the upper plate 1 and the lower plate 2 of the boom body 5 and the stepped portions 13d and 13e of the end closing plate 13 are provided. A fillet weld is made from the outside of the reinforcing plate 15 at the contact portion with the inner surface (M, N, P, Q in FIGS. 4 and 5). As a result, the left and right bracket side plates 11, 12, the end closing plate 13, and the reinforcing plate 15 are integrated with the boom body 5 to complete the end structure of the boom.

  FIG. 6 is a side view of a boom of a hydraulic excavator provided with an end structure according to an embodiment of the present invention. The boom 51 has an overall shape bent in a dogleg shape, and an end portion structure having pin holes at the distal end portion 52 and the proximal end portion 53 is provided. In this embodiment, the end structure of the present invention is provided at the tip 52 of the boom 51.

In FIG. 7, the external appearance of the small turning hydraulic excavator provided with the boom 51 is shown. The excavator includes a lower traveling body 101, an upper revolving body 102 that is turnably mounted on the lower traveling body 101, and a top end portion of the upper revolving body 102 that pivots vertically and horizontally via a swing post 103. And a front work machine 104 connected to each other. The lower traveling body 101 is of a crawler type, and a blade 106 for earth removal is provided on the front side of the track frame 105 so as to be movable up and down. The upper swivel body 102 includes a swivel base 107 having a basic lower structure, and a canopy type cab 108 provided on the swivel base 107. The front work machine 104 includes a boom 51, an arm 112, and a bucket 113. The base end of the boom 51 is pin-coupled to the swing post 103, and the tip of the boom 51 is connected to the arm 112 via the end structure of the present invention . The base end is pin-coupled, and the tip of the arm 112 is pin-coupled to the bucket 113. The boom 51, the arm 112, and the bucket 113 are rotated by expanding and contracting the boom cylinder 115, the arm cylinder 116, and the bucket cylinder 117.

  When work such as excavation work is performed by the front work machine 104, loads are applied to the pin coupling portions of the boom 51, the arm 112, and the bucket 113. Among them, the tip 52 of the boom 51 is a severe part in terms of load. By using the above-described end structure of the present invention for the tip 52 of the boom 51, the strength of the boom tip 52 can be increased, and the life of the front work machine 104 can be improved.

  When work such as excavation work is performed, a load is also applied to the base end portion 53 of the boom 51 and the pin connection portion of the base end portion of the arm 112 (pin connection portion with the front end portion 52 of the boom 51). The end structure of the present invention may be provided on the base, whereby the strength of the boom base end or arm base end can be increased.

  8 and 9 show a conventional boom end structure. 8 is a top view and FIG. 9 is a side view. In the figure, the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals.

  The differences between the conventional boom end structure shown in FIGS. 8 and 9 and the boom end structure of the present invention are as follows. The left and right bracket side plates 211 and 212 of the connecting bracket 206 have extension portions 211d and 212d inclined inward in the thickness direction at the further rear portions of the inclined surfaces 211b and 212b, and linear ends are formed on the extension portions 211d and 212d. Edge portions 211c and 212c are formed and abutted against the end surfaces of the left and right side plates 3 and 4 of the boom body 5. The reinforcing plate consists only of a flat partition wall 214 corresponding to the partition wall 14 of the reinforcing plate 15 of the present invention.

  The end closing plate 213 has substantially the same shape as the end closing plate 13 of the present invention, and is integrated between the left and right bracket side plates 211 and 212 by welding. The reinforcing plate (partition plate) 214 is surrounded on all sides by the upper plate portion 213b and the lower plate portion 213c of the end closing plate 213 and the left and right bracket side plates 211 and 212, and is integrated with them by welding. The left and right bracket side plates 211 and 212 are integrated by welding in a state where the linear end surfaces 211c and 212c of the extension portions 211d and 212d are attached to the end surfaces of the left and right side plates 3 and 4 of the boom body 5. .

  10 and 11 show details of the welded portion. In the figure, a to p are welding locations. Around the partition plate 214, there are four welds e, e, f, and f with respect to the left and right bracket side plates 211 and 212 and the reinforcing plate 213. The edge portions of the extension portions 211d and 212d of the left and right bracket side plates 211 and 212 are butt welded by welding portions i and j.

  In the above-described conventional boom end structure, the partition wall is surrounded by the left and right bracket side plates 211 and 212 and the end closing plate 213 in order to improve the rigidity against bending and twisting at the tip of the boom. A plate 214 is arranged. However, since the partition plate 214 has a flat plate shape, when it is joined to the surrounding bracket side plates 211 and 212 and the end portion closing plate 213 by welding, there is no pressing and the wall plate 214 easily falls. If the partition plate 214 is tilted to some extent, there is a gap between the surrounding bracket side plates 211, 212 and the end closing plate 213. Prone to defects.

  In addition, the partition plate 214 is disposed on the back side of the enclosed space in a state surrounded by the left and right bracket side plates 211 and 212 and the end closing plate 213, so that it is difficult to locate the mounting position. It is. As a result, it takes time to adjust the position of the partition plate 214, and it is necessary to add a jig or a member for adjusting the inclination and positioning of the partition plate 214.

  On the other hand, in the present embodiment, the reinforcing plate 15 is formed in a U-shaped horizontal section by the partition plate 14 and the left and right side plate portions 15a and 15b, and the partition plate 14 side of the reinforcing plate 15 is the end closing plate. 13 is integrated with the left and right bracket side plates 11 and 12 and the end closing plate 13 by welding while being inserted between the upper plate portion 13b and the lower plate portion 13c and between the left and right bracket side plates 11 and 12. Thus, the left and right side plate portions 15a and 15b of the reinforcing plate 15 are supported by the surrounding members (the upper plate portion 13b and the lower plate portion 13c of the end closing plate 13 and the left and right bracket side plates 11 and 12), thereby separating the partition plate. 14 is prevented, the occurrence of unwelded portions during welding due to the inclination of the partition plate 14 is reduced, welding defects are less likely to occur, and a high-quality end structure can be provided.

  In addition, since the position of the partition plate 14 can be adjusted by inserting and removing the left and right side plate portions 15a and 15b of the reinforcing plate 15 with respect to the surrounding members, only the partition plate 214 is connected to the left and right bracket side plates 211 and 212. Compared to the conventional end structure disposed on the back side of the space surrounded by the part closing plate 213, the positioning of the partition plate 14 is facilitated, the time for adjusting the position of the partition plate 14 is shortened, and the welding work is reduced. It can be shortened. In addition, since the partition plate 14 does not fall down and positioning is easy, it is not necessary to add a member other than the partition plate, such as an adjustment jig, simplifying the equipment and shortening the welding work in this respect as well. Can be planned.

  In the present embodiment, since the left and right side plate portions 15a and 15b of the reinforcing plate 15 partly come out of the left and right bracket side plates 11 and 12, the entire reinforcing plate is disposed inside the left and right bracket side plates. Compared to the case, the position adjustment of the partition plate 14 is facilitated, the adjustment time of the position of the partition plate 14 is further shortened, and the welding work can be shortened.

  In the above embodiment, the rear portions of the left and right side plate portions 15 a and 15 b of the reinforcing plate 15 are extended to the outside of the left and right bracket side plates 11 and 12, and the end surfaces of the side plate portions 15 a and 15 b are left and right of the boom body 5. The left and right bracket side plates 11 and 12 are provided with extension portions 211d and 212d in the same manner as the conventional end structure shown in FIGS. The rear portions of the left and right side plate portions 15 a and 15 b are terminated in the extension portions 211 d and 212 d of the left and right bracket side plates 11 and 12, and the end surfaces of the extension portions 211 d and 212 d of the left and right bracket side plates 11 and 12 are left and right of the boom body 5. The end plates of the side plates 3 and 4 may be welded together. Also by this, the partition plate 14 side of the reinforcing plate 15 is inserted between the upper plate portion 13b and the lower plate portion 13c of the end closing plate 13 and between the left and right bracket side plates 11 and 12, thereby preventing the partition plate 14 from falling down. In addition, the left and right side plate portions 15a and 15b of the reinforcing plate 15 can be taken in and out of the surrounding members, whereby the position of the partition plate 14 can be adjusted, and welding defects due to the inclination of the partition plate 14 are less likely to occur. Positioning of the partition plate 14 becomes easy, and the welding work can be shortened.

It is a top view which shows the edge part structure of the boom concerning one embodiment of this invention. It is a side view of the edge part structure of the boom shown in FIG. It is a perspective view of the edge part structure of the boom shown in FIG. It is a figure similar to FIG. 1 which shows the detail of a welding part. It is a figure similar to FIG. 2 which shows the detail of a welding part. It is a side view of the boom of the hydraulic shovel provided with the edge part structure concerning one embodiment of the present invention. It is a figure which shows the external appearance of the small turning hydraulic excavator provided with the boom with which the edge part structure of this invention is provided. It is a top view which shows the edge part structure of the conventional boom. It is a side view of the edge part structure of the conventional boom shown in FIG. It is a figure similar to FIG. 8 which shows the detail of a welding part. It is a figure similar to FIG. 9 which shows the detail of a welding part.

Explanation of symbols

1 Upper plate 2 Lower plate 3, 4 Left right plate 5 Boom body (link body)
6 Connecting bracket portions 11, 12 Left and right bracket side plates 11a, 12a Pin holes 11b, 12b Inclined surfaces 11c, 12c End surface 13 End closing plate 13a Bending plate portion 13b Upper plate portion 13c Lower plate portion 13d, 13e Stepped portion 14 Partition Plate 15 Reinforcing plates 15a, 15b Left and right side plate portions A to A welded portion

Claims (3)

In the end structure of the work machine link formed by integrally joining the connection bracket portion to one end of the link body formed by the upper plate, the lower plate, and the left and right side plates,
The connecting bracket portion is located between left and right bracket side plates, an end closing plate that is sandwiched between the left and right bracket side plates, and closes a front end opening of the link body; and the left and right bracket side plates and end closing plates And a reinforcing plate that improves rigidity against bending and torsion at the tip of the link by a flat partition wall portion surrounded on all sides,
The end closing plate is configured by a bent plate portion constituting the closed end portion, and an upper plate portion and a lower plate portion extending rearward from the bent plate portion in a vertical U-shape,
The reinforcing plate is configured in a U-shaped horizontal section by the flat partition plate portion and left and right side plate portions extending rearward from the partition plate portion,
The end closing plate is integrated by welding between the left and right bracket side plates, and the reinforcing plate is between the upper and lower plate portions of the end closing plate and between the left and right bracket side plates. The work link end structure is integrated with the left and right bracket side plates and the end closing plate by welding. The end structure of the work link according to claim 1,
The rear portions of the left and right side plate portions of the reinforcing plate extend to the outside of the left and right bracket side plates, and the rear end portions of the left and right bracket side plates are welded at the contact portions with the outer surfaces of the left and right side plate portions of the reinforcing plate. Are joined by
The left and right bracket side plates, end closing plates and reinforcing plates are welded with the rear end surfaces of the end closing plates attached to the end surfaces of the upper and lower plates of the link main body, and the left and right side plate portions of the reinforcing plates. An end structure of a work link characterized in that the end surface is integrated with the link main body by welding with end surfaces of left and right side plates of the link main body. In the end structure of the boom formed by integrally joining the connecting bracket portion to the tip of the boom body formed by the upper plate, the lower plate, and the left and right side plates,
The connecting bracket portion is positioned between left and right bracket side plates, an end closing plate that is sandwiched between the left and right bracket side plates, and closes a front end opening of the boom body, and the left and right bracket side plates and an end closing plate. And a reinforcing plate that improves rigidity against bending and torsion at the tip of the boom by a flat partition wall part surrounded by four sides,
The end closing plate is configured by a bent plate portion constituting the closed end portion, and an upper plate portion and a lower plate portion extending rearward from the bent plate portion in a vertical U-shape,
The reinforcing plate is configured in a U-shaped horizontal section by the flat partition plate portion and left and right side plate portions extending rearward from the partition plate portion,
The end closing plate is integrated by welding between the left and right bracket side plates, and the reinforcing plate is between the upper and lower plate portions of the end closing plate and between the left and right bracket side plates. The boom end portion structure is integrated with the left and right bracket side plates and the end portion closing plate by welding in a state where is partially inserted.

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