JP2000143165A - Counter weight mounting structure and counter weight mounding and demounting method for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the working efficiency when a counter weight is mounted and demounted to a vehicle. SOLUTION: In a case when the counter weights are loaded on a vehicle, a counter weight of second stage is hoisted in a state that a counter weight 1 of first stage is floated from the ground surface, the counter weight 2 of second stage is overlapped on the counter weight of first stage while positioning a hoisting ring 6a and a clearance groove, and both are fastened by a bolt 74a and a nut 74b. Similarly a counter weight 3 of third stage and a counter weight 4 of fourth stage are fastened by a bolt 75a and a nut 75b. Then the integrated counter weight 1 of first stage and counter weight 2 of second stage, and the integrated counter weight 3 of third stage and counter weight 4 of fourth stage are respectively hoisted to be fixed to a frame 64, whereby the working efficiency can be improved in comparison with an operation stacking the counter weights one by one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight mounting structure for a construction machine comprising a plurality of segment weights removably mounted on a construction machine such as a hydraulic shovel or a crawler crane, and a counterweight attaching / detaching method.

[0002]

2. Description of the Related Art For example, in a construction machine such as a crane, a counterweight composed of a plurality of segment weights is loaded on a rear end of an upper revolving structure in order to balance a vehicle body during operation. Since the weight of the counterweight increases as the lifting capacity or the vehicle body increases, the counterweight may be detached from the vehicle body and transported individually due to weight restrictions when transporting the crane. When installing such a counterweight, first, the lowermost counterweight is lifted by another crane prepared in advance and set on the upper revolving structure, and then another counterweight is placed on the counterweight by one step. Each counter weight is stacked one by one, and after stacking at a predetermined stage, each counter weight is fixed integrally with the upper revolving unit with a penetrating bolt or the like penetrating each counter weight. On the other hand, when removing the counterweight, the through bolts are removed, the counterweights are lowered one by one from the uppermost counterweight, and finally the lowermost counterweight is removed from the upper rotating body.

[0003]

However, when attaching and detaching the counterweights, as described above, if the counterweights are stacked or unloaded one by one as described above, it takes a lot of time and work efficiency is deteriorated. Further, when the capacity of the crane prepared in advance is large, if the counterweights are stacked or lowered one by one, the lifting capacity of the crane cannot be effectively used, and the efficiency becomes inefficient.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a counterweight for a construction machine which can greatly reduce the labor required for attaching and detaching a counterweight, and effectively use the lifting capacity of a crane used for attaching and detaching the counterweight. An object of the present invention is to provide a mounting structure and a counterweight attaching / detaching method.

[0005]

Means for Solving the Problems (1) Referring to FIGS. 1 to 5 showing an embodiment, the invention according to claim 1 is characterized in that at least two segment weights 1 are stacked.
To the first connecting means 7
1a to 73a, 71b to 73b, the vehicle 6
The present invention is applied to a counterweight mounting structure of a construction machine which is mounted on the counterweight 4. Then, the first coupling means 7
At least two segment weights 1-5 integrated by second connecting means 74a-76a, 76b-76b different from 1a-73a, 71b-73b are connected by first connecting means 71a-73a, 71b-73b. The above-mentioned object is achieved by attaching to the vehicle 64. (2) According to the invention of claim 2, as shown in FIGS.
Stacked at least two segment weights 1 to 5
The counterweight CW composed of
73a and 71b to 73b, and is applied to a counterweight mounting structure of a construction machine which is integrally mounted on a vehicle 64. Then, the first coupling means 71a
Second coupling means 77a to 80a, 7 for integrating at least two segment weights 1 to 5 of the counterweight CW attached to the vehicle 64 at ７３73a, 71.
The above-mentioned object is achieved by providing 7b to 80b. (3) According to the invention of claim 3, as shown in FIGS.
Stacked at least two segment weights 1 to 5
The counterweight CW composed of
73a and 71b to 73b are applied to a method of attaching and detaching a counterweight of a construction machine which is integrally attached to the vehicle 64. Then, the first coupling means 71a-7
3a, 71b-73b and other second coupling means 74a-74b.
At least two segment weights 1 to 5 are integrated at 76a, 76b to 76b, and the integrated
Of the vehicle 64 by the connecting means 71a to 73a and 71b to 73b
The above-mentioned object is achieved by attaching to the. (4) According to the invention of claim 4, as shown in FIGS.
Stacked at least two segment weights 1 to 5
The counterweight CW composed of
73a and 71b to 73b are applied to a method of attaching and detaching a counterweight of a construction machine which is integrally attached to the vehicle 64. Then, the first coupling means 71a-7
At least two segment weights 1 to 5 of the counterweight CW attached to the vehicle 64 at 3a, 71 are connected to second connecting means 77a to 80a, 77b to which are separate from the first connecting means 71a to 73a, 71b to 73b. 80b, the first connecting means 71a-73a, 71b-73
b, the attachment of the counterweight CW is released, and at least two integrated segment weights 1 to 5
The above-mentioned object is achieved by integrally removing.

[0006] In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments of the present invention are used to make the present invention easy to understand. However, the present invention is not limited to this.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. First Embodiment FIG. 1 is a side view of a crawler crane on which a counterweight of a construction machine according to an embodiment of the present invention is mounted.
As shown in FIG. 1, the crane includes a lower traveling body 61 and an upper revolving body 62 rotatably provided on the lower traveling body 61.
And a boom 63 attached to the front end of the upper swing body 62 so as to be able to undulate. The upper swing body 62 includes a frame 64 on which an engine, hydraulic equipment, and the like are mounted, and a frame 6.
A building 65 for mounting the engine, hydraulic equipment, and the like therein to protect them from the weather and the like;
A counter weight CW for balancing the vehicle body during work is attached to the rear end of the frame 64. The upper revolving unit 62 is provided with an A frame 68 on which a boom hoisting rope 67 is wrapped around the top. The A frame 68 is partially shrunk during transportation of the vehicle, for example, and turns in the direction of the arrow. Be moved.

[0008] Counter weight C according to the present embodiment
W is a perspective view showing the configuration, as shown in FIG.
It is composed of four stages vertically (hereinafter referred to as a first stage counter weight 1, a second stage counter weight 2, a third stage counter weight 3, and a fourth stage counter weight 4 in order from the bottom),
2nd stage counter weight 2nd stage counter weight 4
Is divided into left and right. The second-stage counterweights 2 to 4 have the same shape and have the same shape.
At the center of the second to fourth stage counterweights, an integrated counterweight 5 (referred to as a center counterweight) is disposed in the second to fourth stages. Further, a gap Δt for storing the A frame 58 is provided between the second to fourth counter weights 4 and the center counter weight 5. The counterweights 1 to 4 divided into a plurality of segments are respectively symmetrical with respect to the center line L, and are hereinafter referred to as counterweights 1 to 4 located on the right side of the center line L.
Will be described.

2 and counterweights 1 to 5 shown in FIG.
As shown in FIG. 3, which is a cross-sectional view taken along the line III-III in a state where is assembled, a rear portion 64a of the frame 64 is formed in a U-shaped cross section, and a rear end plate 64b is welded to the rear end. . A concave groove 11 is formed on the lower surface of the first stage counterweight 1.
And a frame rear end portion 64 a having a U-shaped cross section is fitted in the groove 11. In the upper and lower surfaces of the frame rear end portion 64a and the rear end plate 64b, and the upper surface and the rear surface of the first stage counterweight 1, through holes 64c to 64e, 1 are respectively provided.
0a and 10b are open. Through holes 10a, 64c,
64d and through holes 10b and 64e each have a bolt 71
a and 72a are inserted, and nuts 71
The first stage counterweight 1 is fastened to the frame 64 by screwing the b and 72b. The head of the bolt 71a and the second stage counterweight 2 are provided on the upper surface of the first stage counterweight 1 in which the through hole 10a is opened.
A counterbore 10c is provided for avoiding interference with the lower surface.

FIG. 4 is a sectional view taken along the line IV-IV in a state where the counterweights 1 to 5 of FIG. 2 and FIG. 2 are assembled.
As shown in FIG. 5, suspension rings 6a to 6e are provided on the upper surface of each of the counterweights 1 to 5 so that a slinging wire hooked on a hook of a crane is inserted when the counterweights 1 to 5 are lifted. On the lower surface of the second to fourth counterweights, a suspension ring 6a is provided.
Relief grooves 21, 31, 41 at positions corresponding to
Are provided in the escape grooves 21, 31, 41, and the suspension rings 6a to 6
c is loosely fitted and the lower surfaces of the counterweights 2 to 4 and the suspension ring 6
The interference with the counterweights a to 6c is prevented, and the respective counterweights 1 to 4 are loosely positioned. Further, through holes 12, 22, 32, and 42 are respectively opened in the first to fourth counterweights 4, and bolts 73a are inserted through the through holes 12, 22, 32, and 42, respectively. By screwing the nut 73b to the tip,
1st stage counter weight 1st to 4th stage counter weight 4
Are fastened together.

FIG. 5 is a sectional view taken along the line VV in a state where the counterweights 1 to 5 of FIG. 2 and FIG. 2 are assembled.
As shown in the figure, through-holes 13, 23, 33, 43 are respectively opened in the first-stage counterweights 1-4, and the upper and lower counterweights 2, 4 having through-holes 23, 33, 43 are provided. Counterbore 23 for interference prevention on the end face
a, 23b, 33a, 33b, 43a, and 43b are provided. A bolt 74a is inserted into the through holes 13 and 23, and a nut 74b is screwed into the end of the bolt 74a, so that the first-stage counterweight 1 and the second-stage counterweight 2 are integrated. Similarly, bolts 7 are provided in through holes 33 and 43.
The third stage counterweight 3 and the fourth stage counterweight 4 are integrated by screwing a nut 75b into the end of the third stage counterweight 3a. A relief groove 51 is also provided on the lower surface of the center counterweight 5 at a position corresponding to the center suspension ring 6a 'of the first-stage counterweight 1. As shown in FIG. 2, through holes 10d and 52 are also formed in the center of the first stage counterweight 1 and the center counterweight 5. This through hole 40d, 5
2, a bolt 76a is inserted, and a nut 76
The center counterweight 5 is fastened to the first-stage counterweight 1 by screwing b.

Here, a procedure for attaching and detaching the counterweight CW to and from the vehicle according to the present embodiment will be described. When attaching the counterweight CW to a vehicle, first,
In order to attach the nut 74b to the lower surface of the first-stage counterweight, for example, a timber is laid below the first-stage counterweight 1 to float the first-stage counterweight 1 from the ground. Next, the second-stage counterweight 2 is lifted by a crane prepared in advance, and is placed on the first-stage counterweight 1 while aligning the positions of the relief groove 21 and the suspension ring 6a. Further, a bolt 74a is inserted into the through holes 13 and 23, and a nut 74b is screwed into the end of the bolt 74a, and the first-stage counterweight 1 and the second-stage counterweight 2 are fastened together. Similarly, the third-stage counterweight 3 and the fourth-stage counterweight 4 are also fastened together. Subsequently, the integrated first-stage counterweight 1 and second-stage counterweight 2
Is set on the lifting frame 64 by a crane, and the counterweights 1 and 2 are fixed to the frame 64 using bolts 71a and 72a and nuts 71b and 72b. Then
A third-stage counterweight 3 and a fourth-stage counterweight 4 integrated thereon are overlapped while being aligned, and a bolt 73a is inserted into each of the through holes 12, 22, 32, and 42, and a nut 73b is attached to the tip thereof. By screwing together, the first-stage counterweights 1 to 4 are integrated. Finally, the center counterweight 5 is overlaid on the first-stage counterweight 1, and the two are fastened using bolts 76a and nuts 76b.

To remove the counterweight CW from the vehicle, the procedure reverse to that described above is executed. That is, first, loosen the nut 76b and remove the bolt 76a,
Lower center counterweight 5. Next, the nut 73b is loosened and the bolt 73a is removed to divide the counterweights 1 to 4 into two sets of the first-stage counterweight 1 and the second-stage counterweight 2, and the third-stage counterweight and the fourth-stage counterweight 4. I do. Then, the integrated third-stage counterweight 3 and fourth-stage counterweight 4 are lifted by a crane and lowered from the vehicle. Finally, loosen the nuts 71b, 72b to remove the bolts 71a, 72a.
, And the integrated first-stage counterweight 1 and second-stage counterweight 2 are lowered from the vehicle. When the same counter weights 1 to 4 are to be mounted next time, the bolts 74a and nuts 74b that fasten the first-stage counter weight 1 and the second-stage counter weight 2 and the third-stage counter weights 3 and 4 It is not necessary to remove the bolts 75a and nuts 75b fastening the stage counterweight 4, and the counterweights 1, 2 and the counterweights 3, 4 are attached in an integrated state.

As described above, according to the first embodiment, 1
The first stage counter weight 1 and the second stage counter weight 2,
A plurality of counterweights 1 to 4 called a third-stage counterweight 3 and a fourth-stage counterweight 4 are attached to or detached from the vehicle in a state where they are assembled in advance. In other words, the time required for attaching and detaching the counterweights is reduced, that is, the number of times the counterweights 1 to 4 are lifted using the crane, the number of times of setting the counterweights to each other is reduced, and the work efficiency is improved, and the lifting capacity of the crane is reduced It can be used effectively. In addition, since the second-stage counterweights 2 to 4 have the same shape, the manufacturing cost is reduced, and the upper and lower combinations of the counterweights 2 to 4 are free, and the usability is improved.

Second Embodiment FIG. 6 is a perspective view of a counterweight according to a second embodiment of the present invention as viewed from the right rear, and FIG.
FIG. 7 is a sectional view taken along line VII-VII. 6 and 7, the same parts as those in FIGS. 2 to 5 described above are denoted by the same reference numerals, and the differences will be mainly described below. As shown in FIGS. 6 and 7, through holes 14, 24, 34 and 44 are opened in the first to fourth counter weights 4 instead of the through holes 13, 23, 33 and 43, respectively. Notches 14a, 24a, 34a, and 44a are provided on the lower surfaces of the first to fourth counterweights 4a, 24a, 34a, and 44a. A bolt 77a is inserted into the through holes 24, 34, and 44, and a nut 77b inserted into the cutout portion 34a is screwed into the tip of the bolt 77a, so that the second-stage counterweight 2 to the fourth-stage counterweight 4 Are fastened together.

As described above, in the second embodiment, the through holes 14, 24, 34, and 44 are opened in the counterweights 1 to 4, and the notches 14 are formed in the counterweights 1 to 4.
a, 24a, 34a, and 44a are provided, so that the bolts 7
7a and nut 77b can be attached or detached. Thereby, for example, the counter weights 1 to 5
Can be stacked one by one when mounted on a vehicle, and a plurality of counterweights 1 to 3 can be collectively lowered when removed from the vehicle. Further, similarly to the first embodiment, a plurality of counterweights 1 to 5 can be pre-assembled and then mounted on a vehicle. In this case,
Since the nut 77b can be inserted into the notch portion 14a, there is no need to lift the lowermost counterweight 1 from the ground, and the working efficiency is further improved.

Third Embodiment FIG. 8 is a perspective view of a counterweight according to a third embodiment of the present invention as viewed from the rear right, and FIG. FIG. 9 is a cross-sectional view taken along the line IX-IX in a state in which No. 5 is assembled. 8 and 9 described above with reference to FIGS.
The same parts as those in FIG. 5 are denoted by the same reference numerals, and the differences will be mainly described below. As shown in FIGS. 8 and 9, the first-stage counterweight 1 has a screw hole 8 instead of the through hole 13.
0b is provided, and the second stage counterweight 2 is provided with a through hole 25 and a screw hole 79b instead of the through hole 23. The third stage counterweight 3 is provided with through holes 35 and 36 and a screw hole 78b instead of the through hole 33, and the fourth stage counterweight 4 is provided with through holes 45 to 47 instead of the through hole 43. I have. Bolt 7 in through hole 47
8a is inserted, the bolt 78a is screwed into the screw hole 78b, and the third-stage counterweight 3 and the fourth-stage counterweight 4 are integrated. A bolt 79a is inserted into the through holes 36 and 46, and the bolt 79a is
And the second to fourth stage counterweights 4 are integrated. Furthermore, through hole 2
Bolts 80a are inserted through 5, 35 and 45,
a is screwed into the screw hole 80b, and the first to fourth counterweights 4 are integrated. 8 and 9, three types of bolts 78a to 80a are shown at the same time, but actually three types of bolts 78a to 80a are shown.
Are not used at the same time.
Combination of 4 (2 stages, 3
One of them is selected in accordance with (stage, four).

As described above, in the third embodiment, the through holes 25, 35, 36, 45 to 47 are formed in the counterweights 1 to 4.
And the screw holes 78b to 80b are provided, so that any counterweights 1 to 4 can be integrated without using a nut, and as a result, the number of parts is reduced.

In the first embodiment, the first stage counter weight 1 and the second stage counter weight 2, and the third stage counter weight 3 and the fourth stage counter weight 4
Are combined and integrated, and in the second embodiment, the second-stage counterweights 2 to the fourth-stage counterweights 4 are combined and integrated, but the combination is merely an example, and the combination is actually an example. The combination is determined by the capacity of the crane prepared for lifting the counterweights 1 to 5. That is, when the crane capacity is small and it is difficult to integrally lift the counterweights 1 to 5, the counterweights 1 to 5 are stacked one by one as before, and the crane capacity is large and the first-stage counterweight 1 is increased. If the first to fourth stage counterweights 4 can be lifted integrally, the first to fourth stage counterweights 4 are integrated and then mounted on a vehicle.

According to the present invention, a plurality of counterweights 1 to 4 are provided.
It is intended to improve the work efficiency by attaching and detaching to the vehicle in advance, and this can be executed in various modes other than the above embodiment. For example, in the above-described embodiment, the central counterweight 5 is formed into an integral shape, but is not divided into an integral shape and is divided into three parts, and the divided counterweights are divided into second-stage counterweights 2 to fourth-stage counterweights 4. Similarly, they may be integrated. Also, counter weight 1
The shapes of (5) to (5) and the shape of the connection portion with the frame 64 are not limited to the above-described embodiment, and may be any shapes. Furthermore, the number of stages above and below the counterweights 1 to 5 is not limited to four, but may be any number as long as it is two or more. Furthermore, bolts 71a-80a and nuts 71b-
A fastening member other than 77b and the screw holes 77b to 80b may be used.

In the correspondence between the above-described embodiment and the claims, each of the first-stage counter weights 1 to 5 employs a segment weight and a bolt 71a.
73a and the mating nuts 71b-73b provide the first coupling means with the bolts 74a-80a and the mating nuts 74b-77b and screw holes 78b-80b.
Constitute the second coupling means.

[0022]

As described in detail above, claim 1
According to the third aspect of the invention, at least two segment weights integrated by the second connecting means different from the first connecting means are attached to the vehicle by the first connecting means. Compared with the case where the counterweight is attached to the vehicle one by one, the work efficiency when attaching and detaching the counterweight is improved, and the lifting ability of the crane can be effectively used. According to the second and fourth aspects of the present invention, the first
Since at least two segment weights of the counterweight attached to the vehicle can be integrated by the second connecting means different from the first connecting means,
When attaching the counterweights, it is possible to stack them on the vehicle one by one as in the prior art, and when removing the counterweights, a plurality of segment weights can be integrated and lowered.

[Brief description of the drawings]

FIG. 1 is a side view of a crane mounted with a counterweight of a construction machine according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a counterweight of the construction machine according to the first embodiment of the present invention.

FIG. 3 shows the counterweight of FIG. 2 in an assembled state;
III-III sectional view.

FIG. 4 shows the counterweight of FIG. 2 in an assembled state;
IV-IV sectional view.

FIG. 5 shows a state in which the counterweight of FIG. 2 is assembled.
VV line sectional view.

FIG. 6 is a perspective view showing a configuration of a counterweight of a construction machine according to a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a perspective view showing a configuration of a counterweight of a construction machine according to a third embodiment of the present invention.

FIG. 9 shows a state where the counterweight of FIG. 8 is assembled.
IX-IX sectional view.

[Explanation of symbols]

 Reference Signs List 1 1st stage counterweight 2 2nd stage counterweight 3 3rd stage counterweight 4 4th stage counterweight 5 center counterweight 64 frame 71a-80a bolt 71b-77b nut 78b-80b screw hole CW counterweight

Claims (4)

[Claims] 1. A counterweight mounting structure for a construction machine in which counterweights comprising at least two stacked segment weights are integrally mounted on a vehicle by a first coupling means, wherein the counterweights are separate from the first coupling means. A counterweight mounting structure for a construction machine, wherein at least two of the segment weights integrated by the second connecting means are mounted on the vehicle by the first connecting means. 2. A counterweight mounting structure for a construction machine in which counterweights comprising at least two stacked segment weights are integrally mounted on a vehicle by first coupling means, wherein the first coupling means comprises a vehicle. And a second connecting means for integrating at least two of the counterweights of the counterweight mounted on the counterweight. 3. A counterweight attaching / detaching method for a construction machine wherein a counterweight comprising at least two stacked segment weights is integrally attached to a vehicle by a first coupling means, wherein the counterweight is different from the first coupling means. A method of attaching / detaching a counterweight of a construction machine, wherein at least two of the segment weights are integrated by the second connecting means, and the integrated one is attached to the vehicle by the first connecting means. 4. A counterweight attaching / detaching method for a construction machine, wherein counterweights comprising at least two stacked segment weights are integrally attached to a vehicle by first coupling means, wherein the vehicle is attached to the vehicle by the first coupling means. At least two of the segment weights of the counterweight attached to the first and second coupling means are integrated by a second coupling means different from the first coupling means, and the attachment of the counterweight by the first coupling means is released; The integrated at least two
A counterweight attaching / detaching method for a construction machine, wherein two segment weights are integrally removed.