JP2000054435A - Counterweight device for construction machine - Google Patents

Counterweight device for construction machine

Info

Publication number
JP2000054435A
JP2000054435A JP10231156A JP23115698A JP2000054435A JP 2000054435 A JP2000054435 A JP 2000054435A JP 10231156 A JP10231156 A JP 10231156A JP 23115698 A JP23115698 A JP 23115698A JP 2000054435 A JP2000054435 A JP 2000054435A
Authority
JP
Japan
Prior art keywords
counterweight
mounting
cylinder
lifting cylinder
construction machine
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP10231156A
Other languages
Japanese (ja)
Inventor
Isao Osato
勲 大里
Original Assignee
Hitachi Constr Mach Co Ltd
日立建機株式会社
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.)
Filing date
Publication date
Application filed by Hitachi Constr Mach Co Ltd, 日立建機株式会社 filed Critical Hitachi Constr Mach Co Ltd
Priority to JP10231156A priority Critical patent/JP2000054435A/en
Publication of JP2000054435A publication Critical patent/JP2000054435A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/18Counterweights

Abstract

PROBLEM TO BE SOLVED: To efficiently perform counterweight attaching/detaching work and to simplify constitution. SOLUTION: A counterweight 11 is provided with an elevating cylinder 5, and the counterweight 11 is elevated almost vertically between an abutting plate 6 of a revolving frame 3 and the ground surface G by this elevating cylinder 15. In the case of performing work of attaching/detaching the counterweight 11 to/from the revolving frame 3 in the work field or the like, a crane or the like for lifting the counterweight 11 can therefore be dispensed with, and attaching/detaching work can be efficiently performed. Since there is no need to provide link mechanism or the like between the revolving frame 3 and the counterweight 11, constitution can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight device for a construction machine suitably used for a construction machine such as a hydraulic shovel and a hydraulic crane.

[0002]

2. Description of the Related Art In general, in a construction machine such as a hydraulic shovel, a working device is provided so as to be able to ascend and descend on a front side of an upper revolving structure as a construction machine body, and a weight of the working device is provided on a rear side of the upper revolving structure. A counterweight for balancing is provided.

[0003] The above-mentioned hydraulic excavator is usually loaded on a trailer or the like and carried into a work site.
If the weight of the hydraulic excavator exceeds the loading limit of the trailer, disassemble the upper revolving unit and the counterweight, carry them separately to the work site, and then attach the counterweight to the rear side of the upper revolving unit at the work site. I do work. When the hydraulic excavator is carried out of the work site, the work of removing the counterweight from the rear side of the upper swing body is performed.

[0004] Here, in the case where the counterweight is to be attached / detached while the counterweight is suspended using a hydraulic crane or the like, a hydraulic crane is required every time the counterweight is attached / detached at the work site. The attaching / detaching operation cannot be performed efficiently.

On the other hand, in order to efficiently attach / detach the counterweight to / from the upper revolving unit, a counterweight attaching / detaching device for a working machine having a structure in which the counterweight is raised and lowered on the upper revolving unit side between the upper revolving unit and the ground. (For example, Japanese Patent Application Laid-Open No. 7-268908).

In this counterweight attaching / detaching device, a link mechanism is provided on the rear end side of the frame of the upper swing body,
With the counterweight connected to the distal end side of the link mechanism by a connecting tool or the like, the link mechanism is rotated by expanding and contracting the hydraulic cylinder to raise and lower the counterweight toward the rear end side of the frame. .

[0007]

However, in the above-described counterweight attaching / detaching apparatus according to the prior art, the link mechanism is used to lift the counterweight, and the link mechanism is rotated by a hydraulic cylinder. In addition to the complicated structure, there is a problem that the load applied to the hydraulic cylinder from the counterweight increases due to the link ratio.

That is, in the prior art, the counterweight is moved up and down so as to draw an arc-shaped trajectory by rotating the link mechanism with the hydraulic cylinder.
At this time, the hydraulic cylinder receives a large bending moment via the link mechanism. For this reason, a specially-designed hydraulic cylinder is required to increase the rigidity against the bending moment, which not only raises the cost, but also requires special reinforcement on the counterweight mounting portion side of the frame. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made in consideration of the above-mentioned problems. It is intended to provide a device.

[0010]

According to the present invention, there is provided a counterweight mounting portion provided on a frame of a construction machine, and a counterweight removably provided on the counterweight mounting portion. Applied to counterweight devices for construction machinery.

A feature of the structure adopted in the first aspect of the present invention is that the counterweight is provided with an elevating cylinder for raising and lowering the counterweight with respect to the counterweight mounting portion.

With this configuration, for example, when the counterweight is mounted on the counterweight mounting portion of the frame, the counterweight is located on the ground near the counterweight mounting portion. Then, the counterweight can be lifted up to the position of the counterweight mounting portion without providing a complicated link mechanism or the like only by raising the counterweight upward by the lifting cylinder, thereby facilitating the mounting work of the counterweight. be able to.

Further, when removing the counterweight from the counterweight mounting portion, the counterweight can be easily removed by lowering the counterweight downward by the lifting cylinder.

According to a second aspect of the present invention, the counterweight mounting portion is provided with a mounting member for mounting the counterweight to the counterweight mounting portion while the counterweight is held at the ascending position by the lifting cylinder. .

With this configuration, the counterweight is lifted to the position of the counterweight mounting portion by the lifting cylinder, and the counterweight held at the raised position is mounted on the counterweight mounting portion by the mounting member, so that the counterweight can be mounted. Can be easily mounted.

Further, the invention according to claim 3 is characterized in that the counterweight is provided with a cylinder accommodation space extending upward and downward and accommodating the lift cylinder.

[0017] With this configuration, the lifting cylinder is accommodated in the cylinder accommodating space and provided on the counterweight in a state substantially perpendicular to the ground. The effect of the bending moment due to the weight of the member can be suppressed.

According to a fourth aspect of the present invention, the elevating cylinder comprises a hydraulic cylinder which expands and contracts a rod with respect to a tube by supplying and discharging pressure oil from the outside. Another object of the present invention is to provide a grounding plate extending along the lower surface of the weight and capable of grounding on the ground.

With this configuration, when the counterweight is raised and lowered with respect to the counterweight mounting portion by the lifting cylinder, the grounding plate grounded on the ground supports the weight of the counterweight with a large grounding area. The weight can be raised and lowered in a stable state.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a counterweight device for a construction machine according to the present invention will be described below in detail with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a lower traveling body, 2 denotes an upper revolving body as a construction machine main body which is pivotably mounted on the lower traveling body 1, and the upper revolving body 2 comprises a revolving frame 3; Cab 4 and building 5 provided on the revolving frame 3
And a counter weight 11 described later.

Reference numeral 6 denotes an abutment plate as a counterweight mounting portion provided at the rear end of the revolving frame 3.
Is a part of the revolving frame 3, and the counterweight 11
In the width direction of the revolving frame 3 (left,
Right). Then, the counterweight 11 is fixed to the abutment plate 6 by bolts 20 to be described later, with the front surface 11C of the counterweight 11 being abutted against the rear surface of the abutment plate 6.
Are attached to the rear side of the upper swing body 2 (see FIG. 2).

Reference numeral 7 denotes a working device provided on the front side of the upper revolving unit 2. The working device 7 includes a boom 8 provided at the center of the front part of the revolving frame 3 so as to be able to move up and down. An arm 9 provided on the distal end side so as to be capable of raising and lowering;
And a backhoe-type bucket 10 rotatably provided at the tip end of the backhoe. The working device 7 excavates earth and sand by rotating the bucket 10 on the tip side of the arm 9 while raising and lowering the boom 8 and the arm 9.

Numeral 11 designates a counterweight which is detachably provided on the rear side of the upper revolving unit 2 in order to maintain a weight balance with the working device 7. The counterweight 11 has an upper surface as shown in FIGS. Part 11A, lower part 11B, front part 11C, rear part 11D and left and right side parts 11
It is formed as a mass having E, 11E. Further, a plurality of counterweights 11 (for example, penetrating in the front and rear directions from the front surface 11C to the rear surface 11D) (
(2) bolt insertion holes 12, 12 are spaced apart in the left and right directions.

Reference numeral 13 denotes a concave portion as a cylinder housing space provided in the counterweight 11, and the concave portion 13
The upper surface 11A to the lower surface 11B of the counterweight 11
, And extends in the upward and downward directions, and is formed as a rectangular groove by extending a middle portion in the left and right directions of the front surface portion 11C to the rear surface portion 11D side. An elevating cylinder 15, which will be described later, is accommodated in the recess 13 so as to be able to expand and contract in the upward and downward directions.

Reference numerals 14 and 14 denote a pair of brackets projecting from the upper surface portion 11A of the counterweight 11, and the brackets 14 are arranged to face each other in the left and right directions with the recessed portion 13 interposed therebetween.

Reference numeral 15 denotes an elevating cylinder provided on the counterweight 11, and the elevating cylinder 15 is a tube 15
A and a hydraulic cylinder composed of a rod 15B attached to a piston (not shown) slidably inserted into the tube 15A, and each oil chamber (not shown) of the tube 15A It is connected to a hydraulic source (not shown) mounted on the hydraulic excavator using a hydraulic hose 16 or the like.

Here, a mounting eye 17 is fixed to the bottom side of the tube 15A, and both ends of a pin 18 inserted into the mounting eye 17 are fixed to each of the brackets 14 so that the lifting cylinder 15 can be moved. The counter weight 11 is accommodated in the recess 13 and is attached to the counter weight 11 while maintaining a posture substantially perpendicular to the ground G.

Reference numeral 19 denotes a grounding plate fixed to the rod tip side of the elevating cylinder 15. The grounding plate 19 extends along the lower surface 11B of the counterweight 11, and has a slightly smaller area than the lower surface 11B. It consists of a rectangular steel plate. When the rod 15B of the lifting cylinder 15 is retracted into the tube 15A and contracts, the grounding plate 19 moves the counterweight 1 as shown in FIGS.
When the rod 15B of the elevating cylinder 15 extends from the tube 15A when it comes into contact with the lower surface 11B of the cylinder 1 as shown in FIG.

Therefore, for example, as shown in FIG. 4, after the counterweight 11 is placed on the ground G with the rod 15B of the lifting cylinder 15 reduced, the rod 15B is extended, as shown in FIG. The counterweight 11 can be raised vertically from the ground G to a position facing the abutment plate 6 of the revolving frame 3. The weight of the counterweight 11 and the like at this time is supported with a large grounding area by the grounding plate 19 provided at the distal end of the rod 15B, so that the counterweight 11 can be stably held at the raised position shown in FIG. It has a configuration.

Reference numerals 20 and 20 denote bolts serving as attachment members for fastening the counterweight 11 to the abutment plate 6 of the revolving frame 3. Each bolt 20 is inserted into each bolt insertion hole 12 from the rear surface 11D side of the counterweight 11. The counterweight 11 is fastened to the abutment plate 6 by screwing a screw portion on the tip end side to the abutment plate 6.

The counterweight device of the hydraulic shovel according to the present embodiment has the above-described configuration, and a method of attaching and detaching the counterweight using the counterweight device will be described below.

First, when the counterweight 11 is mounted on the turning frame 3 of the hydraulic excavator, as shown in FIG. 4, the counterweight 11 holding the rod 15B of the lifting cylinder 15 reduced is transported by a trailer or the like. Then, after placing the counterweight 11 on the ground G, the rear end of the revolving frame 3 is made to approach the counterweight 11 by running the hydraulic shovel.

Then, with the rear end of the revolving frame 3 approaching the counterweight 11 placed on the ground G, the hydraulic hose 1 is connected to the tube 15A of the lifting cylinder 15.
6 is connected.

Next, pressure oil from a hydraulic source (not shown) mounted on the hydraulic excavator is supplied and discharged into the tube 15A of the lifting cylinder 15 through the hydraulic hose 16, and the tube 1
Extend rod 15B from 5A. At this time, since the grounding plate 19 provided on the distal end side of the rod 15B is in contact with the ground G, the counterweight 11 is
5 rises vertically together with the tube 15A, and the front part 11C of the counterweight 11 faces the abutment plate 6 provided on the revolving frame 3 (see FIG. 5).

Then, as shown in FIG. 5, the position of the bolt holes provided in the abutment plate 6 and the position of the bolt insertion holes 12 provided in the counterweight 11 are matched with each other. Is stopped, and the counter weight 11 is held at the raised position. In this state, a bolt 20 is inserted into each bolt insertion hole 12 from the rear surface portion 11D side of the counterweight 11, and the bolt 20 is screwed into a bolt hole of the abutment plate 6, whereby the counterweight 11 is attached to the abutment plate 6. To conclude.

Thus, after the counterweight 11 is fastened to the butting plate 6 of the turning frame 3 by the bolt 20,
When the rod 15B of the lifting cylinder 15 is reduced and the ground plate 19 is brought into contact with the lower surface 11B of the counterweight 11 as shown in FIG. 2, the work of attaching the counterweight 11 to the turning frame 3 is completed.

On the other hand, when removing the counterweight 11 from the turning frame 3 of the hydraulic shovel, the rod 15B of the lifting cylinder 15 is extended while the counterweight 11 is fastened to the abutment plate 6 by the bolt 20. Then, the ground plate 19 is grounded to the ground G.

Then, while the ground plate 19 is in contact with the ground G, the bolt 20 is removed and the turning frame 3 is removed.
Of the abutment plate 6 and the counterweight 11 is released. As a result, the counterweight 11 can be detached from the turning frame 3 and is supported on the ground G by the grounding plate 19 and the lifting cylinder 15.

Next, in this state, the rod 15B of the elevating cylinder 15 is reduced, and the counterweight 1 is attached to the ground plate 19.
Counter weight 1 until lower surface 11B of
Lower 1 vertically downward.

Then, as shown in FIG. 4, with the lower surface 11B of the counterweight 11 abutting against the ground plate 19, each hydraulic hose 16 is removed from the tube 15A of the lifting cylinder 15 so that The work of removing the counterweight 11 is completed.

Thus, according to the present embodiment, the counterweight 11 is provided with the elevating cylinder 15, and the elevating cylinder 15 moves the counterweight 11 substantially vertically between the abutment plate 6 of the revolving frame 3 and the ground G. When the work for attaching and detaching the counterweight 11 to and from the revolving frame 3 is performed at a work site or the like, a crane or the like for lifting the counterweight 11 can be eliminated, and the attaching and detaching work can be performed efficiently. It can be carried out. Further, since there is no need to provide a link mechanism or the like between the turning frame 3 and the counterweight 11, the configuration can be simplified.

A grounding plate 19 is provided at the tip end of the rod 15B of the lifting cylinder 15 to raise and lower the counterweight 11 between the abutment plate 6 of the revolving frame 3 and the ground G. 19 is grounded, so that the entire weight of the counterweight 11 is supported with a large grounding area.
Can be raised and lowered in a stable state.

Further, the counterweight 11 is provided with a concave portion 13 extending upward and downward.
Since the counterweight 11 is housed in the recess 13 in a state substantially perpendicular to the ground G,
The weight of the counterweight 11 acts in the direction in which the lift cylinder 15 expands and contracts. For this reason, it is possible to suppress a bending moment or the like from acting on the lifting cylinder 15 when the counterweight 11 is raised and lowered, as compared with, for example, a case where a custom-made lifting cylinder having increased rigidity as in the prior art is used. In addition, the cost of the lifting cylinder 15 can be reduced.

Further, by accommodating the lifting cylinder 15 in the recess 13 provided in the counterweight 11,
The lifting cylinder 15 can be protected from falling rocks during excavation and the like, and the aesthetic appearance of the entire hydraulic excavator including the counterweight 11 can be enhanced, thereby increasing the commercial value.

In the above-described embodiment, an example is described in which one elevating cylinder 15 is provided at the center of the counterweight 11 in the left and right directions, but the present invention is not limited to this. For example, as in a modification shown in FIG.
Two lifting cylinders 1 at positions symmetrical in the left and right directions
5 and 15 may be provided, and further, three or more elevating cylinders 15 may be provided.

In the above-described embodiment, the case where the tube 15A of the elevating cylinder 15 is attached to the counterweight 11 and the grounding plate 19 is provided at the tip end of the rod 15B is taken as an example. Alternatively, for example, the rod 15B of the lifting cylinder 15 may be attached to the counterweight 11 and the ground plate 19 may be provided at the distal end of the tube 15A.

Further, in the above-described embodiment, a hydraulic shovel has been described as an example of a construction machine having a counterweight device. However, the present invention is not limited to this. The present invention can be widely applied to a counterweight device.

[0049]

As described above in detail, according to the first aspect of the present invention, the counterweight is provided with an elevating cylinder, and the elevating cylinder moves the counterweight up and down with respect to the counterweight mounting portion of the frame. When the work of attaching and detaching the counterweight to and from the counterweight mounting portion of the frame is performed at the work site, a crane or the like for lifting the counterweight can be eliminated, and the attaching and detaching work can be performed efficiently. It can be carried out. Further, there is no need to provide a link mechanism or the like between the frame and the counterweight, so that the configuration can be simplified.

According to the second aspect of the present invention, the counterweight mounting portion is provided with a mounting member for mounting the counterweight to the counterweight mounting portion while the counterweight is held at the raised position by the lifting cylinder. The counterweight mounting operation can be easily performed simply by mounting the counterweight held at the raised position by the lifting cylinder to the counterweight mounting portion by the mounting member.

Further, according to the third aspect of the present invention, since the counterweight is provided with the cylinder housing space extending upward and downward for housing the lift cylinder, the counterweight is housed in the cylinder housing space. Thus, the lifting cylinder can be provided on the counterweight in a state substantially perpendicular to the ground. This makes it possible to suppress the bending moment and the like from acting on the lifting cylinder when the counterweight is raised and lowered. For example, the cost of the lifting cylinder is reduced as compared with the case where a custom-made lifting cylinder with increased rigidity is used. Can be reduced.

Further, by accommodating the lifting cylinder in the cylinder housing space, the lifting cylinder can be protected from falling rocks during excavation, etc., and the aesthetic appearance of the entire hydraulic excavator including the counterweight can be enhanced to enhance the commercial value. Can be.

According to the fourth aspect of the present invention, a grounding plate which extends along the lower surface of the counterweight and which can be grounded on the ground is provided on the rod tip side of the hydraulic cylinder constituting the lifting cylinder. Therefore, when the counterweight is lifted and lowered by the lifting cylinder, the grounding plate grounded on the ground supports the weight of the counterweight with a large ground contact area, so that the counterweight can be raised and lowered in a stable state.

[Brief description of the drawings]

FIG. 1 is an external view showing a hydraulic shovel to which a counterweight device for a construction machine according to an embodiment of the present invention is applied.

FIG. 2 is a partially cutaway side view showing, in an enlarged manner, a counterweight, a lifting cylinder, and the like in FIG. 1;

FIG. 3 shows a counterweight, a lifting cylinder, and the like.
It is sectional drawing seen from the arrow III-III direction in the middle.

FIG. 4 is a partially broken side view showing a state in which a lifting cylinder is reduced and a counterweight is lowered to the ground.

FIG. 5 is a partially broken side view showing a state in which a counterweight is raised by extending a lifting cylinder.

FIG. 6 is a cross-sectional view showing a counterweight device according to a modification of the present invention at the same position as in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving superstructure 3 Revolving frame (frame) 6 Impact plate (Counter weight mounting part) 11 Counter weight 13 Depressed part (Cylinder accommodation space) 15 Elevating cylinder 15A Tube 15B Rod 19 Ground plate 20 Bolt (Mounting member)

Claims (4)

[Claims]
1. A counterweight device for a construction machine, comprising: a counterweight mounting portion provided on a frame of a construction machine; and a counterweight removably provided on the counterweight mounting portion. A counterweight device for a construction machine, comprising a lift cylinder for raising and lowering the counterweight with respect to a counterweight mounting portion.
2. The construction according to claim 1, wherein the counterweight mounting portion is provided with a mounting member for mounting the counterweight to the counterweight mounting portion while the counterweight is held at a raised position by the lifting cylinder. Machine counterweight device.
3. The counterweight device for a construction machine according to claim 1, wherein the counterweight is provided with a cylinder housing space extending upward and downward and housing the elevating cylinder.
4. The lifting cylinder comprises a hydraulic cylinder which expands and contracts a rod with respect to a tube by supplying and discharging pressure oil from the outside, and a rod tip side of the hydraulic cylinder extends along a lower surface of the counterweight. The counterweight device for a construction machine according to claim 1, wherein a grounding plate is provided which extends and can be grounded on the ground.
JP10231156A 1998-08-03 1998-08-03 Counterweight device for construction machine Pending JP2000054435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10231156A JP2000054435A (en) 1998-08-03 1998-08-03 Counterweight device for construction machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10231156A JP2000054435A (en) 1998-08-03 1998-08-03 Counterweight device for construction machine

Publications (1)

Publication Number Publication Date
JP2000054435A true JP2000054435A (en) 2000-02-22

Family

ID=16919186

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10231156A Pending JP2000054435A (en) 1998-08-03 1998-08-03 Counterweight device for construction machine

Country Status (1)

Country Link
JP (1) JP2000054435A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010195589A (en) * 2009-02-16 2010-09-09 Bauer Maschinen Gmbh Construction vehicle
EP2354077A1 (en) * 2010-02-09 2011-08-10 Kobelco Cranes Co., Ltd. Mobile crane having counterweight
KR101324880B1 (en) * 2006-12-18 2013-11-01 두산인프라코어 주식회사 Structure for separating or mounting counterweght of heavy equipment
KR101532777B1 (en) * 2007-12-26 2015-06-30 두산인프라코어 주식회사 Apparatus for removing and mounting a counter weight of heavy equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101324880B1 (en) * 2006-12-18 2013-11-01 두산인프라코어 주식회사 Structure for separating or mounting counterweght of heavy equipment
KR101532777B1 (en) * 2007-12-26 2015-06-30 두산인프라코어 주식회사 Apparatus for removing and mounting a counter weight of heavy equipment
JP2010195589A (en) * 2009-02-16 2010-09-09 Bauer Maschinen Gmbh Construction vehicle
KR101234731B1 (en) * 2009-02-16 2013-02-19 바우어 머쉬넨 게엠베하 Vehicle, in particular construction vehicle
EP2354077A1 (en) * 2010-02-09 2011-08-10 Kobelco Cranes Co., Ltd. Mobile crane having counterweight
US8528755B2 (en) 2010-02-09 2013-09-10 Kobelco Cranes Co., Ltd. Mobile crane having counterweight

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