JP2015151741A - canning structure and construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique, in a canning structure including a boss, allowing restricting cracks to a plate to which the boss is welded.SOLUTION: An arm 24 includes a top plate 41, a lower plate 42, a left side plate 43, a right side plate 44 and a boss BS1. The boss BS1 is arranged so that the axis direction DR is perpendicular to the left side plate 43 and the right side plate 44, and is welded to the lower plate 42. The lower plate 42 is divided into a lower plate 42A and a lower plate 42B. The boss BS1 has a weir WR1 projecting from a side to which the lower plates 42A, 42B are welded, and extending in the axis direction DR. The lower plates 42A, 42B abut against both sides of the weir WR1 from the extending direction of the lower plate 42 and are welded to the weir WR1.

Description

The present invention relates to a can manufacturing structure having a boss and a technology related thereto.

  In construction machines such as hydraulic excavators, an attachment constituted by a boom and an arm is connected to the machine body. The arm is provided with a boss for connecting to the boom. For example, in the hydraulic excavator described in Patent Document 1, the boss member (11) is welded to the lower plate (7) constituting the arm (3).

JP-A-9-125441

  However, in Patent Document 1, since the boss member (11) and the lower plate (7) are welded only from the side of the arm (3), depending on how the arm (3) is melted, There was a problem that the plate (7) cracked. Specifically, as shown in the reference diagram of FIG. 9, when the weld penetration for joining the boss (11) and the lower plate (7) is shallow, the lower plate (7) is cracked starting from the point PT. The problem arises.

  Then, an object of this invention is to provide the technique which can suppress that a crack arises in the plate to which the said boss | hub is welded in the can manufacturing structure provided with a boss | hub.

  In order to achieve the above object, the present invention includes a first plate and a second plate that face each other, a third plate and a fourth plate that connect the first plate and the second plate and face each other, A can-making structure having an axial direction perpendicular to the third plate and the fourth plate, and a boss welded to the inside of the first plate, wherein the first plate is The boss is divided into a first welded plate and a second welded plate, and the boss protrudes from the surface on which the first welded plate and the second welded plate are welded and extends in the axial direction. The first welded plate and the second welded plate are butted against both sides of the weir from the extending direction of the first plate and are welded to the weir. A can structure is provided.

  Further, at least one of the first butted surface of the first welded plate to the weir and the second butted surface of the second welded plate to the weir has an angle with respect to the axial direction. preferable.

  The boss has a first surface in contact with the first welded plate and a second surface in contact with the second welded plate, and the first surface and the second surface are bordered by the weir. It is preferable to have a predetermined angle.

  Further, the can making structure is a structure of an arm can of a work machine, and the boss is preferably arranged at a base end portion of the arm.

  The present invention is also a construction machine, comprising a machine body and an attachment connected to the machine body, the attachment having a can-making structure, and the can-making structures are first to face each other. A plate and a second plate, and a third plate and a fourth plate that connect the first plate and the second plate and face each other, and an axial direction is orthogonal to the third plate and the fourth plate. And a boss welded to the inside of the first plate, the first plate is divided into a first welded plate and a second welded plate, and the boss is The first welded plate and the second welded plate have a weir that protrudes from the surface to which the first welded plate and the second welded plate are welded and extend in the axial direction. A construction machine characterized by being abutted on both sides of the weir from the extending direction of the first plate and welded to the weir It has to offer further.

  According to the can manufacturing structure of claim 1, since the weir provided on the boss and the first plate are welded in the axial direction, the deformation of the first plate accompanying the welding is alleviated, and the first plate It is possible to suppress the occurrence of cracks.

  According to the can manufacturing structure of Claim 2, compared with the case where both the 1st butting surface and the 2nd butting surface are parallel with respect to the axial direction of a boss | hub, the welding bead which joins a 1st board and a weir is It is possible to increase the stress on the first plate and the boss.

  According to the can manufacturing structure according to claim 3, even if the first surface and the second surface have a predetermined angle and it is difficult to align the first welded plate and the second welded plate, The alignment can be easily performed with reference to the weir.

  According to the can manufacturing structure of Claim 4, it can suppress that a crack arises in the board to which a boss | hub is welded among the boards which comprise an arm can.

  According to the construction machine of the fifth aspect, it is possible to alleviate the deformation of the first plate due to the welding and suppress the occurrence of cracks in the first plate.

1 is a side view showing a hydraulic excavator according to an embodiment of the present invention. The side view of an arm. The III arrow line view of FIG. The side view which expanded the boss periphery. The perspective view which expanded the boss periphery. The figure which shows a mode that the lower board of an arm and the boss | hub are welded. The figure which shows the weir and lower plate which concern on a modification. The figure which shows the shape of the weir and lower plate which concern on a modification. Reference diagram for explaining the problem.

<1. Embodiment>
A construction machine and a can manufacturing structure according to an embodiment of the present invention will be described with reference to FIGS. Hereinafter, the hydraulic excavator 1 and the arm 24 (also referred to as an arm can) will be described as examples of the construction machine and the can manufacturing structure, respectively.

  As shown in FIG. 1, the hydraulic excavator 1 includes a crawler type lower traveling body 2 and an upper swing body 3.

  The upper swing body 3 is mounted on the lower travel body 2 and can swing around the vertical axis with respect to the lower travel body 2. A work attachment 4 is mounted on the upper swing body 3. The work attachment 4 includes a boom 14 that can be raised and lowered, an arm 24 that is rotatably attached to the tip of the boom 14, and a bucket 34 that is attached to the tip of the arm 24.

  Hereinafter, the arm 24 of the present embodiment will be specifically described with reference to FIGS. 2 to 6. In FIG. 2, for the sake of convenience, the left-right direction of the drawing is described as the front-back direction of the arm 24.

  As shown in FIGS. 2 and 3, the arm 24 includes an upper plate 41, a lower plate 42, a left side plate 43, and a right side plate 44. Here, the upper plate 41 and the lower plate 42 face each other. The left side plate 43 and the right side plate 44 connect the upper plate 41 and the lower plate 42 and face each other. The lower plate 42 is divided into two plates 42A and 42B.

  As shown in FIGS. 2 and 3, the arm 24 includes a boss BS1 having a pin hole HL at a base end portion (also referred to as an arm foot). As shown in FIG. 3, the boss BS <b> 1 is arranged so that the axial direction DR of the pin hole HL is orthogonal to the left side plate 43 and the right side plate 44. The arm 24 is pivotally attached to the boom 14 (FIG. 1) by inserting a connecting pin through the pin hole HL of the boss BS1.

  FIG. 4 is an enlarged side view of a welding location between the boss BS1 and the lower plates 42A and 42B, and FIG. 5 is an enlarged perspective view of the welding location.

  As shown in FIGS. 4 and 5, the boss BS1 has a weir WR1 that protrudes downward from the gap between the lower plates 42A and 42B. The weir WR1 protrudes from the surfaces 52A and 52B on the side where the lower plates 42A and 42B are welded and extends in the axial direction DR. The surfaces 52A and 52B have a predetermined angle with the weir WR1 as a boundary.

  As shown in FIG. 5, the lower plate 42 is composed of two lower plates 42A and 42B divided by the weir WR1 as a boundary, and extends from the extending direction (main stress direction) of the lower plate 42 to both sides of the weir WR1. It is faced. When the lower plates 42A and 42B are abutted on both sides of the weir WR1, a line LN1 is formed between the lower plate 42A and the weir WR1, and a line LN2 is formed between the lower plate 42B and the weir WR1. The In FIG. 4, the gap between the lower plates 42A and 42B and the weir WR1 is shown wider for the sake of explanation.

  Then, as shown in the enlarged portion of the area AR in FIG. 4, the lower plate 42A and the boss BS1 are welded along the lines LN1, LN2 (that is, the axial direction DR), respectively, and the weld beads BD1, BD2 are line LN1. , LN2. In short, the lower plates 42A and 42B are abutted on both sides of the weir WR1 and welded to the weir WR1. Here, the butted surfaces 62A and 62B of the lower plates 42A and 42B with respect to the weir WR1 are parallel to the axial direction DR.

  As shown in FIG. 6, the lower plates 42 </ b> A and 42 </ b> B and the boss BS <b> 1 are also welded from the side of the arm 24. Specifically, the left and right ends of the lower plates 42A and 42B and the boss BS1 are welded from the side of the arm 24 along the extending direction of the arm 24 to form weld beads BD3 and BD4 shown in FIG.

  As described above, in this embodiment, the weir WR1 provided on the boss BS1 protrudes from the surfaces 52A and 52B and extends in the axial direction DR of the boss BS1 (see FIGS. 4 and 5). The lower plates 42A and 42B are abutted on both sides of the weir WR1 from the extending direction of the lower plates 42A and 42B and are welded to the weir WR1.

  Therefore, as compared with the case where the lower plates 42A and 42B and the boss BS1 are welded only from the side of the arm 24, the deformation of the lower plates 42A and 42B accompanying the welding is alleviated and the lower plates 42A and 42B are cracked. Can be suppressed.

  Further, when positioning the lower plates 42A and 42B, the lower plates 42A and 42B can be easily aligned by using the weir WR1 as a reference. In particular, as in this embodiment, when the boss surfaces 52A and 52B in contact with the lower plates 42A and 42B form a predetermined angle, it is more difficult to align the lower plates 42A and 42B. However, in the present embodiment, the lower plates 42A and 42B can be aligned without difficulty due to the presence of the weir WR1.

  In the present embodiment, since the lower plates 42A and 42B are configured by two plates, the necessary plate thickness can be adopted for each, and the lower plate 42 is configured by a single plate. In comparison, the weight of the arm 24 can be reduced.

<2. Modification>
The can-making structure and construction machine according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims.

  For example, in the above-described embodiment, as illustrated in FIGS. 4 and 5, the case where the butted surfaces 62A and 62B of the lower plates 42A and 42B to the weir WR1 are parallel to the axial direction DR is illustrated. However, the abutting surfaces may have an angle with respect to the axial direction DR.

  Specifically, as shown in FIG. 7, the weir WR2 of the boss BS2 has a U-shaped convex shape with respect to the lower plates 42C and 42D, and each butting surface of the lower plates 42C and 42D to the weir WR2 is a weir. You may make it have a U-shaped concave shape along the shape of WR2. In other words, both butted surfaces of the lower plates 42C and 42D may have an angle with respect to the axial direction DR.

  According to such a modification, as compared with the case where each butting surface is parallel to the axial direction DR, the weld beads that join the lower plates 42C and 42D and the weir WR2 are increased, and the lower plates 42C and 42D and the boss BS2 are joined. It is possible to relieve the stress on.

  In the above modification, the case where each butting surface of the lower plates 42C and 42D to the weir WR2 has a U-shaped concave shape is illustrated, but the present invention is not limited to this, as shown in FIG. As long as the weld bead has an increased shape, it may have a V-shaped concave shape. Alternatively, as shown in FIG. 8B, it may have a corrugated concave shape. Furthermore, as shown in FIG. 8C, a convex shape (U-shaped) may be used instead of the concave shape.

  Moreover, in each said modification, although the case where both butted surfaces of lower board 42C and 42D had an angle with respect to axial direction DR was illustrated, it is not limited to this, Only one butted surface is set to axial direction DR. You may make it have an angle with respect to it.

  As described above, the can making structure according to the present invention is suitable for an arm constituting an attachment of a construction machine, for example.

1 hydraulic excavator, 2 lower traveling body, 3 upper turning body, 4 work attachment,
14 Boom, 24 Arm, 34 Bucket, 41 Upper plate, 42A, 42B Lower plate,
43 left side plate, 44 right side plate, 52A, 52B surface,
AR area, BD1, BD2, BD3, BD4 weld bead, BS1, BS2 boss,
DR axial direction, HL pin hole, LN1, LN2 line, WR1, WR2 weir

Claims (5)

A first plate and a second plate facing each other;
A third plate and a fourth plate that connect the first plate and the second plate and face each other;
A boss that is arranged so that an axial direction is orthogonal to the third plate and the fourth plate, and is welded to the inside of the first plate;
A can making structure comprising:
The first plate is divided into a first welded plate and a second welded plate,
The boss has a weir that protrudes from the surface on which the first welded plate and the second welded plate are welded and extends in the axial direction.
The first and second welded plates are butted against both sides of the weir from the extending direction of the first plate and welded to the weir. The can making structure according to claim 1,
At least one of the first butting surface of the first welded plate to the weir and the second butting surface of the second welded plate to the weir has an angle with respect to the axial direction. Can manufacturing structure. In the can-making structure according to claim 1 or 2,
The boss has a first surface in contact with the first welded plate and a second surface in contact with the second welded plate,
The can manufacturing structure characterized in that the first surface and the second surface have a predetermined angle with the weir as a boundary. In the can manufacturing structure in any one of Claims 1 thru | or 3,
The can making structure is a structure of an arm can of a work machine,
The boss is arranged at a base end portion of the arm. A construction machine,
The machine body,
An attachment connected to the machine body;
With
The attachment has a can making structure,
The can structure is
A first plate and a second plate facing each other;
A third plate and a fourth plate that connect the first plate and the second plate and face each other;
A boss that is arranged so that an axial direction is orthogonal to the third plate and the fourth plate, and is welded to the inside of the first plate;
Have
The first plate is divided into a first welded plate and a second welded plate,
The boss has a weir that protrudes from the surface on which the first welded plate and the second welded plate are welded and extends in the axial direction.
The construction machine, wherein the first welded plate and the second welded plate are abutted on both sides of the weir from the extending direction of the first plate and welded to the weir.

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