JPH11158927A - Counterweight for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the rotation radius of the rear of a construction machine in accordance with the number of counterweights used. SOLUTION: The exterior 16b of a counterweight 16 and the interior 17a of a counterweight 17 are formed into a trihedral nearly along the circular arc face of a radius around the center of rotation O as a fulcrum. The exterior 17b of the counterweight 17 and the interior 18a of a counterweight 18 are formed into a trihedral nearly along the circular arc face of a radius around the center of rotation C as a fulcrum. The exterior 18b of the counterweight 18 is formed into a curved surface flush with the circular arc face A4 of a radius R4 around the center of rotation O as a fulcrum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear part of a revolving structure of a construction machine such as a crawler crane or a pile driver.
The present invention relates to a counterweight of a construction machine provided in balance with a front load of a revolving superstructure.

[0002]

2. Description of the Related Art In a construction machine such as a crawler crane, a counterweight suitable for the working capacity of a front part of a revolving unit is attached to a rear part of the revolving unit so that a well-balanced crane operation can be performed. The counterweight is divided into a plurality of parts, so that the convenience at the time of disassembly and transportation and the working capacity are correspondingly achieved.

FIGS. 7 and 8 show a conventional counterweight and a mounting state of the counterweight. At the rear of an upper revolving unit 2 of a construction machine 1, three counterweights protruding from a frame 3 are attached. Weights 4, 5, 6 are bolted in such a manner that the weights 4, 5, 6 are overlapped in the front-rear direction of the upper swing body 2.

As the counterweights 4, 5, and 6, a thick vertically long block formed by filling cement or the like in a casing made of a steel plate or the like is used. Counter weight 5
Are the inner surfaces 4a, 5a and the outer surfaces 4b, 5
b are each formed in a planar shape.

The outer counterweight 6 has an inner surface 6a in the same plane as the counterweights 4 and 5 described above.
The outer surface 6b is formed in a trihedral shape substantially along an arc surface A1 having a radius R1 with the pivot point O of the upper revolving unit 2 as a fulcrum,
By making the outer counterweight 6 have such a chamfered shape, the rear turning radius of the upper turning body 2 is reduced and the appearance is improved.

[0006]

In such a configuration, since the number of counterweights must be reduced in accordance with the working capacity of the construction machine, the outer counterweights 6 are required.
When the single or with the intermediate counterweight 5 is removed, both the outer sides of the intermediate counterweight 5 and the inner counterweight 4 project angularly, and the rear turning radius of the construction machine reduces the number of counterweights. It will be relatively large and the benefit will be halved.

Accordingly, an object of the present invention is to provide a counterweight for a construction machine capable of minimizing a rear turning radius of the construction machine in accordance with the number of counterweights used.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a plurality of revolving superstructures are superimposed on the rear of a revolving superstructure in the front-rear direction of the revolving superstructure in accordance with the above-mentioned object, in balance with the working capacity of the revolving superstructure. The counterweight for a construction machine to be mounted as described above is characterized in that the inner and outer surfaces of each counterweight are formed into a curved surface or a polyhedral shape along an arcuate surface having a radius around the center of rotation of the revolving body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIG.
This will be described with reference to FIGS. Crawler crane 10
An upper revolving structure 12 is provided on a lower traveling structure 11 so as to be revolvable, a cab 14 is provided at a front portion of a body frame 13 of the upper revolving structure 12, and a gantry 15 is provided at a rear portion. A pair of parallel support arms 13a, 13a projecting from the frame 13 to the rear of the upper
Three counterweights 16, 17, 18 are superimposed in the front-rear direction of the upper revolving unit 12, and bolts 19, 2
Mounted at 0,21.

A bolt 1 is provided on the rear end face of the body frame 13.
Female screw holes 22, 22, 23,
23 are drilled. The support arms 13a, 13a
The upper revolving structure side of the support arms 13a, 13a has a width enough to support the inner counterweight 16 and has a length sufficient to mount the inner counterweight 16 disposed on the upper revolving structure 12 side. For the counterweights 16, 17, 18 serving as the portions 13b, 13b, a material such as a steel plate filled with cement in a casing or a thick block formed by casting or the like is used in a vertically long manner. The inner counterweight 16 disposed on the upper revolving unit 12 side has an inner surface 16a formed in a planar shape,
The outer surface 16b of the counterweight 16 and the inner surface 17a of the intermediate counterweight 17 are each formed in a trihedral shape substantially along an arc surface A2 having a radius R2 and having the pivot point O of the upper revolving unit 12 as a fulcrum. . Further, the outer surface 17b of the intermediate counterweight 17 and the inner surface 18a of the outer counterweight 18 are each formed in a trihedral shape substantially along an arc surface A3 having a radius R3 with the pivot O as the fulcrum. The outer surface 18b of the further outer counterweight 18 is formed in the same curved surface as an arc surface A4 having a radius R4 with the turning center O as a fulcrum.

On the upper surfaces of the counterweights 16 to 18,
A pair of hooks 24, 24 are protruded from each other, and three inclined recesses 16c, 17c, 18c are formed between the hooks 24, 24.
The counter weights 16 to 18 are suspended by hooks 24 and 24 by a crane, and
2 and detaching the gantry 15 during the transport of the crawler crane 10 by tilting the recesses 16c, 17c, 18c.
To minimize the transport shape of the crawler crane 10 as much as possible.

The inner counterweight 16 has a pair of guide pins 25, 25 projecting from the upper surface of guide blocks 16d, 16d sandwiched between the inclined recesses 16c, and a pair of wide guide grooves 16e, 16e formed on the lower surface. It is recessed.
On the outer surface 16b of the inner counterweight 16, a pair of left and right female screw holes 26, 26 are formed in the upper part, and two pairs of left and right bolt insertion holes 27, 2 are provided below the female screw holes 26, 26.
7, 28, 28 are formed through the inner surface 16a.

The intermediate counterweight 17 has guide blocks 17d, 17d sandwiched between inclined recesses 17c.
A pair of guide pins 25, 25 and a pair of suspension arms 17e, 17e protruding in the direction of the inner surface 17a are provided. Guide holes 29, 29 are provided in the suspension arms 17e, 17e.
Are formed in the vertical direction, and a pair of left and right bolt insertion holes 30 and 30 are formed in the upper part of the inner surface 17a and the outer surface 17b, and two pairs of left and right bolt insertion holes 31, 31, 32 and 32 are formed in the lower part.
Are respectively formed through.

On the outer counterweight 18, a pair of suspension arms 18d, 18d is provided between the inclined recesses 18c.
8a, the suspension arms 18d, 18
Guide holes 29, 29 are formed in the vertical direction in d, and a pair of left and right bolt insertion holes 33, 33 are formed in the inner and outer surfaces 18a, 18b.

This embodiment is configured as described above.
The inner counterweight 16 is provided with a guide groove 16 on the lower surface.
e, 16e are connected to the wide portions 13 of the support arms 13a, 13a.
b, 13b, are mounted on the support arms 13a, 13a, and bolts 19 are respectively inserted into bolt insertion holes 27, 27 below the outer surface 16b. It is attached by screwing into the screw holes 22, 22 (FIG. 5). When the inner counterweight 16 is independently attached to the upper revolving unit 12 in this manner, the outer surface 16b has a trihedral shape substantially along the arc surface A2 with the turning center O as a fulcrum, as if both sides were chamfered. As a result, the rear turning radius of the upper turning body 12 is suppressed to a smaller radius R2 than in the related art.

The middle counterweight 17 is connected to the upper suspension arms 17e, 17e by the inner counterweight 16a.
On the guide blocks 16d, 16d, and the counterweight 1 is inserted into the guide holes 29 of the respective suspension arms 17e.
6, the inner surface 17a substantially matches the outer surface 16b of the inner counterweight 16, and the outer surface 1a
7b, bolts 2 are respectively inserted into bolt insertion holes 30, 30 at the upper part.
0 is inserted, and the bolt 20 is attached by screwing the tip of the bolt 20 into the female screw holes 26, 26 of the inner counterweight 16 (FIG. 6).

Thus, the inner counterweight 16
When the counterweight 17 and the intermediate counterweight 17 are used, the outer surface 17b of the intermediate counterweight 17 located on the outside is used.
However, the rear turning radius of the upper revolving unit 12 is suppressed to a smaller radius R3 than in the related art because the upper turning body 12 is formed in a trihedral shape substantially along the arc surface A3 about the turning center O as a fulcrum, as if both sides were chamfered. Is done.

The outer counterweight 18 locks the upper suspension arms 18d, 18d on the guide blocks 17d, 17d of the middle counterweight 17, and the guide holes 29 of the respective suspension arms 18d. The guide pin 25 of the counterweight 17 is fitted to make the inner surface 18a substantially coincide with the outer surface 17b of the intermediate counterweight 17,
Bolt insertion holes 28, 3 of counterweights 16-18
The bolts 21 are inserted through the bolts 2 and 33, and the ends of the bolts 21 are screwed into female screw holes 23 of the vehicle body frame 13 to be mounted (FIGS. 1, 2, and 4).

As described above, the three counterweights 16
18 are attached to the upper revolving unit 12, the outer surface 18b of the outer counterweight 18 is formed with the same curved surface as the arc surface A4 with the pivot O as the fulcrum.
The rear turning radius of the upper turning body 12 is the same as the conventional radius R4.
Becomes Also, the inner and outer surfaces 1 of the counterweights 16 to 18
Since 6b, 17a, 17b, and 18a have the same shape in a pair that is superimposed on each other, it is not necessary to take extra space that is disadvantageous to the rear turning radius.

In this embodiment, the outer surfaces 16b, 17b, 18b of the counterweights 16, 17, 18 are formed in a trihedral shape or the same curved surface substantially along the arcuate surfaces A2, A3, A4. , Counter weights 16, 17,
Even when the number of 18 is increased or decreased according to the working capacity of the crawler crane 10, the rear turning radius of the upper turning body 12 can be suppressed as small as possible in accordance with the number of counterweights 16, 17, 18 used. .

As an example of use of this embodiment, the intermediate counterweight 17 can be omitted, and the outer counterweight 18 can be directly attached to the inner counterweight 16. In this case, the guide blocks 16d and 16 of the inner counterweight 16 mounted as described above are used.
d, the suspension arm 18 of the outer counterweight 18
and the guide pins 25 of the counterweight 16 are fitted into the guide holes 29 of the suspension arms 18d, and the bolt insertion holes 28, 3 of the weights 16, 18 are locked.
The outer counterweight 18 is attached by inserting a bolt 21 through the screw 3 and screwing the tip of the bolt 21 into the female screw hole 23 of the vehicle body frame 13.

In the above-described embodiment, the outer surface of the inner counterweight and the inner and outer surfaces of the intermediate counterweight are each formed to have a three-sided shape. Alternatively, four or more counterweights can be used.

[0023]

As described above, according to the present invention, the inner and outer surfaces of each of the counterweights, which are mounted on the rear part of the revolving superstructure of the construction machine in the front-rear direction, are supported by the pivot point of the revolving superstructure. When the number of counterweights is increased or decreased in accordance with the work capacity of the construction machine, the rear turning radius of the revolving structure is determined by using the counterweights. It can be kept as small as possible in accordance with the number.

[Brief description of the drawings]

FIG. 1 is a plan view of a crawler crane showing one embodiment of the present invention.

FIG. 2 is a front view of a crawler crane showing one embodiment of the present invention.

FIG. 3 is an exploded perspective view of a counterweight showing one embodiment of the present invention.

FIG. 4 is an enlarged sectional view of a main part of a crawler crane showing one embodiment of the present invention.

FIG. 5 is an enlarged plan view of a main part showing only an inner counterweight showing one embodiment of the present invention;

FIG. 6 is an enlarged plan view of a main part showing an embodiment of the present invention, with inner and intermediate counterweights attached.

FIG. 7 is an exploded perspective view of a counterweight showing an example of a conventional mode.

FIG. 8 is a plan view of a crawler crane showing an example of a conventional embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Crawler crane 11 ... Lower traveling body 12 ... Upper revolving body 13 ... Body frame 15 ... Gantry 13a ... Support arm 13b ... Wide part 16, 17, 18 ... Counterweight 16a, 17a, 18a ... Counterweight 16, 1
Inner surface of 7, 18 16b, 17b, 18b ... Counter weight 16, 1
Outer surfaces of 7, 18 16e, 17e: guide groove O: center of rotation of upper revolving unit 12 A1, A2, A3, A4: radius R1, R2, R3, R4
Arc surface drawn by R1, R2, R3, R4 ... Radius with turning center O as fulcrum

Claims (1)

[Claims] 1. A counterweight for a construction machine which is attached to a rear portion of a revolving structure of a construction machine in such a manner that a plurality of the weights are superimposed on each other in the front-rear direction of the revolving structure in balance with the working capacity of a front portion of the revolving structure. A counterweight for a construction machine, wherein the inner and outer surfaces of the weight are formed into a curved surface or a polyhedral shape along a circular arc surface having a radius around the center of rotation of the rotating body.