KR20140083131A - Arm for excavator having inner reinforcement plate - Google Patents

Arm for excavator having inner reinforcement plate Download PDF

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Publication number
KR20140083131A
KR20140083131A KR1020120152092A KR20120152092A KR20140083131A KR 20140083131 A KR20140083131 A KR 20140083131A KR 1020120152092 A KR1020120152092 A KR 1020120152092A KR 20120152092 A KR20120152092 A KR 20120152092A KR 20140083131 A KR20140083131 A KR 20140083131A
Authority
KR
South Korea
Prior art keywords
arm
plate
reinforcing plate
excavator
inner reinforcing
Prior art date
Application number
KR1020120152092A
Other languages
Korean (ko)
Other versions
KR102017345B1 (en
Inventor
윤희상
윤희문
Original Assignee
두산인프라코어 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 두산인프라코어 주식회사 filed Critical 두산인프라코어 주식회사
Priority to KR1020120152092A priority Critical patent/KR102017345B1/en
Publication of KR20140083131A publication Critical patent/KR20140083131A/en
Application granted granted Critical
Publication of KR102017345B1 publication Critical patent/KR102017345B1/en

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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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/14—Booms only for booms with cable suspension arrangements; Cable suspensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2200/00—Type of vehicle
    • B60Y2200/40—Special vehicles
    • B60Y2200/41—Construction vehicles, e.g. graders, excavators
    • B60Y2200/412—Excavators

Abstract

The present invention relates to an excavator arm having an inner reinforcement plate forming a front operating apparatus of an excavator and, more specifically, to an excavator arm having an inner reinforcement plate which can improve the strength while minimizing the increase of the weight of the arm by having the inner reinforcement plate inside the excavator arm.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an excavator having an inner reinforcing plate,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator arm having an internal reinforcing plate constituting a front working device of an excavator, and more particularly, To an excavator arm having a reinforcing plate.

The excavator is a construction machine that performs various works in civil engineering, construction, and construction work. The excavator is composed of a traveling body that plays a role of moving equipment, a front swing body mounted on the traveling body and rotated 360 degrees, and a front working device .

On the other hand, the arm is usually composed of a hollow structure surrounded by a top plate, a bottom plate, and a side plate, while a load due to vertical / horizontal stresses and moments is large in field work such as excavation or lifting.

Therefore, there arises a problem that deformation occurs in the arm or a crack occurs in the steel plate. Particularly, in case of a super long reach arm having a length of 4 [m] or more, it is more vulnerable to such a problem because of its long shape.

However, if the thickness of the iron plate constituting the arm is increased, the performance of the excavator due to the increase in weight, the decrease in the fuel consumption and the increase in the manufacturing cost are not sufficiently effective there is a problem.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide an internal reinforcing plate inside of an excavator, To provide an excavator arm.

To this end, an excavator arm having an internal reinforcing plate according to the present invention is characterized in that, in an arm constituting a front working device of an excavator, starting from a point where a boom is connected, And an internal reinforcing plate provided within a first condition range corresponding to a point of 70%.

In this case, it is preferable that the internal reinforcing plate is provided within a second conditional range corresponding to the first conditional range and starting from a point where the straight section of the upper plate of the arm ends, 1000 [mm].

Further, the internal reinforcing plate is provided within a third condition range that satisfies the first condition range and the second condition range, respectively, starting from the welding portion of the side plate of the arm and corresponding to 800 [mm] to 1000 [mm] .

Preferably, the inner reinforcing plate is one of a semicircular plate having a semicircular groove on one side of a rectangular plate and a rectangular plate, and a curved plate having a groove having a curvature other than the semicircular shape on one side of the rectangular plate.

In addition, it is preferable that the arm is a super long reach arm having an overall length of 4 [m] or more.

The present invention as described above includes an inner reinforcing plate inside the excavator instead of thickening the thickness of the steel plate of the excavator.

Therefore, the increase in the weight of the arm is minimized, so that the strength and the performance of the excavator can be prevented while preventing the decrease in the fuel consumption.

Further, the present invention can maximize the above effects by optimizing the installation position of the inner reinforcing plate and the shape of the inner reinforcing plate.

1 is a perspective view showing an excavator arm having an internal reinforcing plate according to the present invention.
2 is a front view showing an excavator arm having an internal reinforcing plate according to the present invention.
3 is a first embodiment showing an internal reinforcing plate of an excavator arm having an internal reinforcing plate according to the present invention.
4 is a second embodiment of an internal reinforcing plate of an excavator arm having an internal reinforcing plate according to the present invention.
5 is a third embodiment of an internal reinforcing plate of an excavator arm having an internal reinforcing plate according to the present invention.

Hereinafter, an excavator arm having an internal reinforcing plate according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1, an excavator arm 10 having an internal reinforcing plate according to the present invention includes a boom installed at a front end thereof and a bucket installed at a rear end thereof and a front work device of an excavator . The boom, arm and bucket are operated by hydraulic cylinders, respectively.

An excavator arm (hereinafter, referred to as "arm") 10 having an internal reinforcing plate according to the present invention is composed of an upper plate, a lower plate, and an arm box surrounded by both side plates. An inner reinforcing plate 20 ) Is installed. The inner reinforcing plate 20 is welded in a vertically erected state.

Therefore, the strength of the arm 10 is increased without increasing the thickness of the steel plate constituting the upper plate, the lower plate, the side plate, and the like. Further, since the strength is increased by the inner reinforcing plate 20, the weight of the arm 10 is minimized and the performance and fuel consumption of the excavator are prevented from decreasing.

Particularly, when the arm 10 is a super long reach arm 10 having an overall length of 4 [m] or more, the effect of providing the internal reinforcing plate 20 of the present invention is doubled do.

2, the inner reinforcing plate 20 includes a portion corresponding to a point from 50% to 70% of the entire length A of the arm 10, starting from a portion where the boom is connected. 1 conditions.

The overall length A of the arm 10 is generally the length between the boom connecting shaft hole X1 provided at the front end of the arm 10 and the shaft hole X2 for bucket connection provided at the rear end of the arm 10 .

The reason why the internal reinforcing plate 20 is provided from the 50% point to the 70% point of the total length A of the arm 10 as described above is that the central portion of the entire length A of the arm 10 is the arm 10 ) And is particularly vulnerable to damage to the steel plate, so it includes a 50% point.

At the same time, according to the design shape of the arm 10 itself, the width is narrowed toward the end portion, so that it becomes weak to the work load, and on the contrary, it is limited to 70%

The inner reinforcing plate 20 according to the present invention may be formed from the point (or the starting point of the slope section) at which the upper plate straight section H of the arm 10 ends, together with the first condition or the first condition as described above , And is set within a second condition range that corresponds to 1000 [mm] (U).

As for the top plate shape of the arm 10, there is a straight section H and a slope section from the front end where the boom is connected to the rear end where the bucket is connected. Therefore, the installation position of the inner reinforcing plate 20 is limited to within 1000 [mm] of the slope section.

In the slope section, the width of the arm 10 is continuously narrowed, so it is vulnerable to a workload. On the other hand, as described above, since it is away from the central portion of the total length A of the arm 10, it is limited to within 1000 [mm] from the point where the upper plate straight section H ends.

In addition, the internal gusset 20 of the present invention can be welded together with the first and second conditions, or independently from the first and second conditions, starting from the side plate welded portion W of the arm 10 to 800 [mm] 1000 [mm] (B).

The side plates are usually manufactured in such a manner that two steel plate end portions are abutted against each other. At this time, the internal reinforcing plate 20 is welded at 800 [mm] to 1000 [mm] .

If it is too close to the side plate welding portion W, the other side portion of the arm 10 having a narrow width can not be sufficiently reinforced by being excessively biased to one side portion of the arm 10 to which the boom is connected. On the other hand, It is not possible to reinforce a relatively weak welded portion.

Hereinafter, the internal reinforcing plate of the present invention as described above will be described.

FIG. 3 shows an internal reinforcing plate 20 according to a first embodiment of the present invention. FIG. 4 shows an internal reinforcing plate 20 according to a second embodiment of the present invention. The internal reinforcing plate 20 according to the third embodiment is shown.

The inner reinforcing plate 20 shown in Fig. 3 is a rectangular plate 21, the inner reinforcing plate 20 shown in Fig. 4 is a semicircular plate 22 having a semicircular groove 22a formed on one side of a rectangular plate, The inner reinforcing plate 20 is a curved plate 23 having grooves 23a having curvatures other than the semicircular shape formed on either side of the rectangular plate.

The strength of the arm 10 can be reinforced even if a general rectangular plate 21 is used as shown in Fig. 3, thereby achieving the object of the present invention.

4 and 5, the inner gusset plate 20 according to an embodiment of the present invention may be in the form of a semicircular plate 22 and / or a curved plate 23. The semicircular plate 22 and / or the curvature plate 23 may be provided with a semicircular groove 22a and / or a groove 23a having a curvature.

The corresponding part of the inner stiffening plate 20 does not come into contact with the inner surface of the arm 10 due to the semicircular groove 22a and / or the groove 23a having the curvature.

Accordingly, the corresponding portion avoids the concentration of stress due to the load of the arm 10, and prevents the inner reinforcing plate 20 welded inside the arm 10 from being damaged.

Furthermore, the shape of the portion not in contact with the arm 10 can be formed in a shape of a free-form curve having a semicircular shape and / or various curvatures, so that an optimal condition for dispersing the stress can be achieved.

However, in FIGS. 4 and 5, the reference numerals of "A" and "B " as used in FIG. 2 are used (" C " .

The reason why the same reference numerals are used is that the semicircular groove 22a of the rectangular plate 21 or the groove 23a having a curvature is formed from the entire length A or the welded portion W of the arm 10 to the inner reinforcing plate 20) to the length (B).

Although FIGS. 4 and 5 illustrate that the semicircular groove 22a and the groove 23a having a curvature are respectively formed on the lower portion of the rectangular plate, if the stress concentration can be dispersed, As shown in FIG.

The specific embodiments of the present invention have been described above. It is to be understood, however, that the scope and spirit of the present invention is not limited to these specific embodiments, and that various modifications and changes may be made without departing from the spirit of the present invention. If you have, you will understand.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

10: Excavator arm
20: Internal reinforcing plate
21: Internal reinforcing plate (square plate type)
22: Internal reinforcing plate (semicircular groove type)
23: Inner reinforcement plate (curvature groove type)
X1: Boom connection shaft
X2: Connecting the bucket
A: Arm length
B: Length between the welded portion and the inner reinforcing plate
C: Curvature
W: Weld
H: straight section of the top plate

Claims (5)

In an arm (10) constituting a front working device of an excavator,
And an internal reinforcing plate 20 provided within a first condition range corresponding to a point from 50% point to 70% point of the total length A of the arm 10 starting from a portion where the boom is connected. An excavator arm having an internal reinforcement plate. The method according to claim 1,
The inner reinforcing plate (20)
Is set within a second condition range that satisfies the first condition range and corresponds to 1000 [mm] starting from a point where the upper plate straight section (H) of the arm (10) ends, Excavator arm with reinforcing plate. 3. The method of claim 2,
The inner reinforcing plate (20)
Within a third condition range that satisfies the first condition range and the second condition range and corresponds to 800 [mm] to 1000 [mm] starting from the side plate welded portion W of the arm 10 And an inner reinforcing plate provided on the inner reinforcing plate. The method according to claim 1,
The inner reinforcing plate (20)
A curved plate 23 on which a semicircular groove 22a is formed at one side of a rectangular plate and a groove 23a having a curvature other than the semicircular shape are formed on either side of the rectangular plate, And an inner reinforcing plate disposed on the inner reinforcing plate. 5. The method according to any one of claims 1 to 4,
The arm (10)
Characterized in that the super long reach arm (10) has an overall length (A) of 4 [m] or more.
KR1020120152092A 2012-12-24 2012-12-24 Arm for excavator having inner reinforcement plate KR102017345B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120152092A KR102017345B1 (en) 2012-12-24 2012-12-24 Arm for excavator having inner reinforcement plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120152092A KR102017345B1 (en) 2012-12-24 2012-12-24 Arm for excavator having inner reinforcement plate

Publications (2)

Publication Number Publication Date
KR20140083131A true KR20140083131A (en) 2014-07-04
KR102017345B1 KR102017345B1 (en) 2019-09-02

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108425388A (en) * 2018-05-31 2018-08-21 马鞍山松鹤信息科技有限公司 A kind of excavator swing arm

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5471401U (en) * 1977-10-29 1979-05-21
JPH08333765A (en) * 1995-06-07 1996-12-17 Kubota Corp Boom structure for back hoe
JP2002242227A (en) * 2001-02-15 2002-08-28 Shin Caterpillar Mitsubishi Ltd Work arm structure for work machine
JP2002348903A (en) * 2001-05-25 2002-12-04 Kubota Corp Boom structure of back hoe
JP2003193512A (en) * 2001-12-28 2003-07-09 Komatsu Ltd Work machine and work machine boom of construction machine and manufacturing method therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5471401U (en) * 1977-10-29 1979-05-21
JPH08333765A (en) * 1995-06-07 1996-12-17 Kubota Corp Boom structure for back hoe
JP2002242227A (en) * 2001-02-15 2002-08-28 Shin Caterpillar Mitsubishi Ltd Work arm structure for work machine
JP2002348903A (en) * 2001-05-25 2002-12-04 Kubota Corp Boom structure of back hoe
JP2003193512A (en) * 2001-12-28 2003-07-09 Komatsu Ltd Work machine and work machine boom of construction machine and manufacturing method therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108425388A (en) * 2018-05-31 2018-08-21 马鞍山松鹤信息科技有限公司 A kind of excavator swing arm

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