JP2003261957A - Bucket for construction equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bucket for construction equipment, which has its weld zone less exposed in an outer surface of a bottom plate thereof, to thereby improve the life of the weld zone, i.e., the life of the bucket. <P>SOLUTION: According to the structure of the bucket (10), the bottom plate (14) has bottom plate width-spread portions (28) at the respective weld zones between the bottom plate (14) and respective side plates (16a, 16b). That is, at each bottom plate width-spread portion (28), a side portion of the bottom plate (14) is protruded outward from each of the side plates (16a, 16b) in a width direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bucket equipped on a construction machine and used for excavating and loading earth and sand.

[0002]

2. Description of the Related Art A typical example of a bucket equipped in a construction machine will be described with reference to FIGS. The bucket, generally designated by the numeral 40, includes a bottom plate 42 that is bent into a substantially U shape, and a pair of side plates 44a and 44b that are welded to both sides of the bottom plate 42 in the width direction. The bottom plate 42 is sandwiched between the side plates 44a and 44b, and both ends of the bottom plate 42 are welded and attached by fillet welding W11 and W12 as shown in FIG.

On the outer surface of each of the side plates 44a and 44b, side surface reinforcing plates 46 are welded and attached by fillet welds W13 and W14 to the peripheral edges on the side of the bottom plate 42, respectively.
FIG. 7 shows another form of the side reinforcing plate 46, in which the side plate 44a (44b) of FIG. 6 and the side reinforcing plate 46 overlapped with it are formed by a single thick plate member 48. Is. According to this, one fillet weld W
14 can be omitted, and the number of welding points can be reduced.

On the outer surface of the bottom plate 42, a plurality of (3 in the figure are shown.
Individual rectangular bottom reinforcing plates 50 are side plates 44a, 44b.
In between, the peripheral edge is welded and attached to the bottom plate 42 by fillet welding W15.

A cutting blade 52 is provided at one end of the bottom plate 42 of the bucket 10 in the bending direction, and a plurality of cutting blades 52 (shown as 5 in the drawing).
Individual) excavating blades 54 are attached. This cutting edge 52,
The excavation work is performed by inserting the bucket 40 into the sand from the side of the excavation blade 54.

[0006]

The conventional bucket 40 having the above-mentioned configuration has a problem that the welded portion is easily damaged.

That is, when excavating and loading earth and sand with the bucket 40, the outer surface of the bottom plate 42 is most likely to be worn and worn by earth and sand. In particular, the welds indicated by D in FIG. 6 and E in FIG. 7 are exposed on the outer surface of the bottom surface, so that they directly contact the sediment, and the sediment flows along the fillet of the weld. Therefore, the welded portion is easily damaged and worn, which shortens the life of the bucket.

The present invention has been made in view of the above facts, and its technical problem is to make it possible to reduce the exposed welds on the outer surface portion of the bottom plate of the bucket, and to improve the life of the welds, that is, the life of the bucket. It is to provide a bucket for a construction machine that can be improved.

[0009]

In the present invention, as a bucket for solving the above technical problems, a bottom plate bent in a substantially U shape and both widthwise side portions orthogonal to the bending direction of the bottom plate are provided. A pair of welded side plates, the welded portion of the bottom plate and the side plate, both sides of the bottom plate includes a bottom plate widening portion protruding outward in the width direction from each of the side plates, A construction machine bucket is provided.

A bottom plate widened portion is provided by projecting both side portions of the bottom plate outward in the width direction from the respective side plates. In this portion, the side plates are welded to the bottom plate on the inner surface side of the bottom plate, and the outer surface of the bottom plate is formed. Be able to reduce the exposed welding on the side.

In a preferred embodiment, a cutting edge is provided at one end in the bending direction of the bottom plate, and the bottom plate widening portion is formed on the end side of the cutting edge. Further, a side surface reinforcing plate is welded to the outer surface of each of the side plates of the bottom plate widening portion adjacent to the bottom plate, and a groove for welding is formed between the side surface reinforcing plate and the bottom plate by the side surface reinforcing plate, the side plate and the bottom plate. Has been formed. Further, a bottom surface reinforcing plate is welded to the outer surface of the bottom plate of the bottom plate widening portion, and both ends of the bottom surface reinforcing plate in the width direction are projected outward from the bottom plate.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a bucket of a construction machine constructed according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of a hydraulic excavator which is a typical example of the construction machine. To do.

First, the hydraulic excavator will be described with reference to FIG. A hydraulic excavator generally designated by reference numeral 2 is a lower traveling body 4, an upper revolving body 6 mounted on the lower traveling body 4 so as to be horizontally rotatable, and an upper revolving body 6 is vertically swingably mounted. And the working arm 8 is attached. The bucket 10 is attached to the tip of the working arm 8. The upper swing body 6 is provided with a cab 12.

The working arm 8 includes a boom 8a swingably attached to the upper swing body 6 and an arm 8b swingably attached to the tip of the boom 8a. The bucket 10 swings to the tip of the arm 8b. It is movably attached. A boom operating cylinder 8c is provided between the upper swing body 6 and the boom 8a.
However, an arm operating cylinder 8d is interposed between the boom 8a and the arm 8b, and a bucket operating cylinder 8e is interposed between the arm 8b and the bucket 10.

The bucket 10 will be described with reference to FIGS. 2 and 3. The bucket 10 includes a bottom plate 14 that is bent in a substantially U shape, and a pair of side plates 16a and 16b that are welded to both side portions in the width direction orthogonal to the bending direction of the bottom plate 14. The bottom plate 14 and the side plates 16a and 16b form an essential part of a bucket for storing earth and sand. The bucket 10 is formed substantially symmetrically in the width direction.

At one end of the bottom plate 14 in the bending direction (the lower right end in FIG. 2, the right end in FIG. 3), a cutting blade 18 and a plurality of (five in the drawing) excavating blades attached to the cutting blade 18 are provided. 20 are provided. At the edge of the side plate 16a of the opening of the bucket formed by the bottom plate 14, the side plates 16a, 16b, the side cutting blade 22 is continuous with the cutting blade 18, and the side portion attached to the side cutting blade 22. A drilling blade 24 is provided (hidden in FIG. 2, but also provided on the side plate 16b). On the other end side of the bottom plate 14 in the bending direction (the upper left end side in FIG. 2), a pair of brackets 26 connected to the arm 8b of the working arm 8 and the bucket operating cylinder 8e are provided in the width direction.

The cutting edge 18 attached to the bottom plate 14 is formed in a rectangular shape with a width substantially the same as the width of the bottom plate 14 and is integrally welded to the bottom plate 14. The digging blade 20 is formed of cast steel or forged steel, and the tip portion is attached in a replaceable manner.

A description will be given with reference to FIG. 4 together with FIG. 2 and FIG. The welded portions between the bottom plate 14 and the side plates 16a, 16b are located at the ends (upper left end in FIG. 2, left end in FIG. 3) where the brackets 26, 26 are provided, and the bottom plate 14 is the side plates 16a, 16b.
It is sandwiched between b and both side portions in the width direction are side plates 1 respectively.
It is in contact with 6a and 16b. On the other hand, the cutting edge 18
From the end (the lower right end in FIG. 2, the right end in FIG. 3) of the side plate 1
In the part of the range L up to the part sandwiched between 6a and 16b, both side parts of the bottom plate 14 have a bottom plate widening part 28 protruding outward in the width direction from each of the side plates 16a and 16b by H1 (FIG. 4). Is forming. Therefore, in the bottom plate widening portion 28, the end of the side plate 16a (16b) is brought into contact with the bottom plate 14, and the inner surface side thereof is welded and attached by fillet welding W1 (FIG. 4). The welding W2 on the outer surface side will be described later.

The bottom plate 14 on the outer surface of each of the side plates 16a and 16b
Boomerang-shaped side reinforcing plates 30 are welded and attached to the peripheral edges of the sides in substantially the same range as the above range L. 2 to 4, the side plate 16a side is shown, but the side plate 16b side is also the same. A groove G for welding is formed between the side reinforcing plate 30 and the bottom plate 14 by the side reinforcing plate 30, the side plate 16a and the bottom plate 14, as is apparent from FIGS. As shown in FIG. 4, welding is performed by welding W2 so as to fill the groove G, so that the side surface reinforcing plate 30, the side plate 16a, and the bottom plate 14 in this portion are integrally joined. Portions other than the groove G are welded to the side plate 16a by fillet welding W3.

On the outer surface of the bottom plate 14 in the bottom plate widening portion 28, a plurality of (three in the figure) rectangular bottom reinforcing plates 32 are attached. The bottom surface reinforcing plate 32 extends in the width direction of the bottom plate 14, and both ends in the width direction are projected outward from the both side ends of the bottom plate 14 by a dimension H2 (FIG. 4). The bottom surface reinforcing plate 32 is attached by welding the entire circumference thereof to the outer surface of the bottom plate 14 at both side ends by fillet welding W4.

The bucket 10 constructed as described above is
To explain with reference to FIG. 1, by operating the work arm 8 in the cab 12, for example, the cab 1 indicated by an arrow X
By pulling in the direction of 2, earth and sand will be excavated.

The operation of the bucket 10 as described above will be described.

(1) Prevention of Damage to Welds: Mainly referring to FIGS. 2 and 4, the bucket 1 according to the present invention will be described.
0, since the bottom plate widening portion 28 is provided by projecting both side portions of the bottom 14 outward from the side plates 16a and 16b in the width direction, the bottom plate 14 and the side plates 16a (1
6b) is welded to the inner surface of the bottom plate 14. Therefore, the welding exposed on the outer surface side of the bottom plate 14 can be reduced, damage and wear of the welded portion due to soil and the like can be minimized, and the life of the welded portion of the bucket, that is, the life of the bucket can be improved. it can.

In the widened portion 28 of the bottom plate, the side surface reinforcing plate 30 and the bottom plate 14 are welded to each other on the inner surface side of the bottom plate 14 so as to fill the groove G.
Since the end of the bottom plate 14 is widened and welded to the end face of the bottom plate 14, the bottom plate 14
It is possible to reduce the welding exposed on the outer surface side of the.

(2) Protecting the corner of the bucket: Furthermore, FIG.
Also, as is clear from FIG. 4, since the bottom surface reinforcing plate 32 can be easily projected (H2) in the width direction of the bucket 10, it is possible to easily protect the corner portion of the bucket that is particularly worn. Even if the weld W4 of the protruding portion of H2 is damaged or worn, the bottom surface reinforcing plate 32 is peeled off because both sides in the width direction are welded to the outer surface of the bottom plate 14 in addition to the both side ends of the bottom plate 14. Never.

(3) No special material required: Further, in order to reduce the number of welded parts, it is not necessary to use the thick plate material 48 (FIG. 7) as in the conventional case. It is also possible to eliminate the problem of high manufacturing cost.

[0027]

According to the bucket of the construction machine constructed according to the present invention, it is possible to reduce the exposed welded portion on the outer surface portion of the bottom plate of the bucket and improve the life of the welded portion, that is, the life of the bucket. You can

[Brief description of drawings]

1 is a side view of a hydraulic excavator that is a typical construction machine with a bucket constructed in accordance with the present invention.

FIG. 2 is a perspective view of the bucket shown in FIG. 1 viewed from the outer surface side of the bottom surface.

FIG. 3 is a partial side view of the bucket centering on a bottom surface portion as viewed in the direction of arrow A in FIG.

FIG. 4 is an enlarged cross-sectional view seen in the direction of arrow BB in FIG.

5 is a perspective view showing a conventional bucket viewed from the same direction as FIG.

FIG. 6 is an enlarged cross-sectional view of the welded portion as seen in the direction of arrows CC in FIG.

FIG. 7 is an enlarged cross-sectional view showing another form of the welded portion as viewed in the direction of arrows CC in FIG.

[Explanation of symbols]

2: Hydraulic excavator (construction machinery) 10: Bucket 14: Bottom plate 16a, 16b: side plates 18: Cutting edge 28: Widened bottom plate 30: Side reinforcement plate 32: Bottom reinforcing plate 40: Bucket 42: Bottom plate 44a, 44b: Side plates 46: Side reinforcement plate 50: Bottom reinforcing plate 52: Cutting edge G: Welding groove

Claims (4)

[Claims] 1. A bottom plate bent into a substantially U shape, and a pair of side plates welded to both sides in the width direction orthogonal to the bending direction of the bottom plate, wherein the welded part between the bottom plate and the side plate is A bucket for a construction machine, wherein both side portions of the bottom plate include bottom plate widening portions protruding outward in the width direction from each of the side plates. 2. The bucket for a construction machine according to claim 1, wherein a cutting edge is provided at one end of the bottom plate in the bending direction, and the bottom plate widening portion is formed on the end side of the cutting edge. 3. A side surface reinforcing plate is welded to the outer surface of each of the side plates of the bottom plate widening portion so as to be adjacent to the bottom plate, and the side surface reinforcing plate, the side plate and the bottom plate are used for welding between the side surface reinforcing plate and the bottom plate. The groove of claim 1 is formed.
Or the bucket of the construction machine according to 2. 4. A bottom reinforcing plate is welded to the outer surface of the bottom plate of the bottom plate widening portion, and each of the widthwise ends of the bottom reinforcing plate is
The bucket for a construction machine according to any one of claims 1 to 3, wherein the bucket projects more outward than the bottom plate.