JP2789327B2 - Counter weight - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight suitably used for construction machines such as hydraulic excavators, and more particularly to a counterweight in which a weight adjusting material is filled.

[0002]

2. Description of the Related Art FIGS. 4 to 9 show an example of a hydraulic shovel provided with a conventional counterweight.

[0003] In the drawings, reference numeral 1 denotes a lower traveling body, and 2 denotes an upper revolving body which is mounted on the lower traveling body 1 so as to be capable of turning.
The upper revolving structure 2 cab 4 provided on the revolving frame 3, made from the machine chamber 5 and below the counterweight 7, the rotating frame 3 as shown in FIG. 5, a pair of main frame 3A, 3A, left, Right overhanging frames 3B, 3B, ...
And the side frames 3C, 3C to form a frame structure. Then, the front side bracket portion 3A ₁ next to the working device 6 of each main frame 3A, the rear side has a mounting portion 3A ₂ for counterweight 7.

[0004] Reference numeral 7 denotes a counterweight provided at the rear of the upper swing body 2 to balance with the working device 6, and the counterweight 7 is formed in a substantially rectangular flat plate shape as shown in FIGS . 5 to 9. And a rear plate 10 disposed in an arc shape behind the front plate 8 and welded to the front plate 8 via left and right side plates 9, 9.
And a top plate 11 made of a plurality of flat plates which are welded to the upper end sides of the rear plate 10, each side plate 9 and the front plate 8 and have their upper ends closed, and the front plate 8, each side plate 9 and the rear plate. Lower plates 12A, 12B, and 12C made of a plurality of flat plates which are welded to the lower ends of the face plates 10 and have their lower ends closed together with mount members 13 described later (the lower plates 12 as a whole).
) To form a hollow structure. And
The counterweight 7 is filled with a weight adjusting material (not shown) made of concrete, iron pieces, or the like, and the weight is adjusted according to the working device 6.

[0005] 13 and 13 shows a pair of mounting members spaced left and right in order to place the counterweight 7 on the mounting portions 3A ₂ of the rotating frame 3, respective mounting member 13 is U-shaped cross-section The left and right sides of the lower surface plates 12A, 12B, 1 of the counterweight 7 are formed on the left and right sides.
Welded between 2C. And each of the mounting members 1
Front end of the 3 is welded to the lower end of the front plate 8 as shown in FIG. 9, the rear end is welded to the rear surface of the rear plate 10. Further, a bolt insertion hole 1 is provided on the upper surface side of each mounting member 13.
3A and 13A are bored, and rectangular parallelepiped screw members 14 and 14 are welded thereon. Each of the mounting members 13 includes a bolt 15 shown in FIG.
By screwing in, so as to fix the counterweight 7 on the mounting portions 3A ₂ of the rotating frame 3.

Reference numerals 16 and 16 denote the inside of the counter weight 7,
A pair of reinforcing plates 16 are provided so as to be separated to the right and extend forward and backward. Each reinforcing plate 16 has its upper end welded to the upper surface plate 11 and a screw member 17 described later, and its front end to the front plate 8. And the rear end is welded to the rear face plate 10 to increase the strength of the counterweight 7 as a whole.

Further, 17 and 17 are counterweights 7
And screw members 17 constituting a bracket portion for lifting and suspending. The respective screw members 17 are formed in a substantially square prism shape by a metal material such as iron.
A screw hole 17A into which an eyebolt (not shown) or the like is screwed at the time of suspension is formed. Then, each screw member 17
Is located above and opposite to each mount member 13, penetrates through the top plate 11, is welded to the side surface of each reinforcing plate 16, and is also welded to the top plate 11 to reduce the strength when the counterweight 7 is lifted. Is to be secured.

The prior art hydraulic excavator counterweight 7 has the above-described configuration. Next, the manufacturing process thereof will be described.

First, the rear plate 10 is formed to be curved with a predetermined curvature by applying a roll process or the like to a plate material thicker than the front plate 8 together with the side plates 9, and the left and right ends thereof are bent. Thereby, it is integrally formed with each side plate 9.
The front plate 8 is welded to the front surface of each side plate 9, and the upper plate 11, the lower plate 12, and the mounting members 13 are provided on both upper and lower sides of the front plate 8, each side plate 9 and the rear plate 10. To weld. Further, each reinforcing plate 16 is welded to the upper surface plate 11 between the front plate 8 and the rear surface plate 10 and each screw member 17 is welded.

Then, a counterweight 7 having a hollow structure is formed while leaving a central portion of the upper surface plate 11, and in this state, the counterweight 7 is filled with a weight adjusting material such as concrete or iron pieces. The central portion of the face plate 11 is welded to hermetically close the counterweight 7 to prevent rainwater or the like from entering the counterweight 7.

Next, the counterweight 7 thus manufactured is screwed with an eyebolt or the like in the screw hole 17A of each screw member 17, and a wire or the like is passed through each eyebolt to lift the counterweight 7 with a crane or the like. 7 to each mounting part 3 of the revolving frame 3.
Placed on A _2, by screwing the bolts 15 shown in FIG. 5 to the screw member 14, so that mounting the counterweight 7 on the rear of the upper rotating body 2 detachably.

[0012]

In the prior art described above, since the weight adjusting material is filled in the counterweight 7, each mounting member 13 is provided between the front plate 8 and the rear plate 10 by the lower plate 12. And the reinforcing plates 16 are fixed to the upper plate 11 by welding between the front plate 8 and the rear plate 10, and the counterweights 7 are attached to the mounting portions 3 A ₂ of the revolving frame 3 via the mount members 13. So that it can be firmly fixed.

However, in the prior art, each mounting member 1
3 and the rear end of each reinforcing plate 16 are welded to the rear plate 10, so that welding distortion or the like is likely to occur on the surface of the rear plate 10, and the surface of the rear plate 10 is a part of the appearance of the hydraulic shovel. To reduce the commercial value.

Further, in order to remove the welding distortion generated on the surface of the rear face plate 10, a grinder finish or the like may be performed by post-processing, but this finishing work is very troublesome and causes a problem of increasing the cost. is there.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can solve the problems such as the occurrence of welding distortion on the surface of the rear plate, can increase the commercial value, and can improve the overall value. It is an object of the present invention to provide a counterweight capable of ensuring the strength of the counterweight.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for filling a weight adjusting material therein.
The present invention is applied to a counterweight having a hollow structure formed by a front plate, a rear plate, an upper plate, a lower plate, and left and right side plates, wherein the lower plate is provided with a mounting member for mounting.

A feature of the invention according to claim 1 is that the mount member is fixed to the lower surface plate and the front end side is fixed to the front plate, and a screw member for mounting to the frame is provided on the upper surface side of the mount. A reinforcing plate extending in the front and rear directions is disposed inside the hollow structure forming the counterweight, and the reinforcing plate has a lower end side on the mount member and the screw member, an upper end side on the upper surface plate, and a front end side on the front end side. respectively secured to the front plate, the internal counterweight prior Symbol reinforcing plate and the mounting member is spaced a rear end side from the rear face plate and the reinforcing plate
In that a structure in which Ru is provided a punching hole for circulating the weight adjusting material to be filled in.

With the above structure, the mount member is fixed by the lower plate and the front plate, and the reinforcing plate is fixed by the mount member, the screw member, the upper plate and the front plate.
The strength of the entire counterweight can be increased, and it is not necessary to fix the reinforcing plate and the rear end side of the mounting member to the rear plate, and no welding distortion occurs on the surface of the rear plate.
In addition, the punched holes provided in the reinforcing
Distribution of weight adjustment material to be filled in the site through punched holes
Can be done.

In this case, the invention according to claim 2 is characterized in that the bracket for lifting and suspending the counterweight is integrally formed at the upper end side of the reinforcing plate so as to protrude from the upper surface plate. Can be integrated.

A feature of the invention according to claim 3 is that the mount member is fixed to the lower plate and the front end side is fixed to the front plate,
A screw member for mounting to the frame is provided on the upper surface side of the mount member, a bracket for lifting and suspending the counterweight is fixedly provided on the upper surface plate, and a front portion is provided inside the hollow structure forming the counterweight. A reinforcing plate extending in a rearward direction, the reinforcing plate having a lower end fixed to the mounting member and the screw member, an upper end fixed to the lifting / suspending bracket, and a front end fixed to the front plate, respectively. before SL reinforcing plate and the mounting member is spaced a rear end side from the rear face plate,
And the reinforcing plate is filled inside the counterweight.
In that a structure in which Ru is provided a punching hole for circulating the weight adjusting material.

According to the above construction, the mount member is fixed by the lower plate and the front plate, and the reinforcing plate is fixed by the mount member, the screw member, the upper plate, the lifting / suspending bracket and the front plate. As in 1, the strength of the entire counterweight can be increased, and there is no need to fix the reinforcing plate and the rear end side of the mounting member to the rear plate, so that welding distortion does not occur on the surface of the rear plate. Ma
Also, the punching holes provided in the reinforcing plate
The weight adjustment material to be filled in the
Can be made.

Further, as in the invention according to claim 4 , a pair of mounting members are provided left and right apart from each other, and the reinforcing plate is located between each of the mounting members and the upper surface plate and is provided on the left and right. The left and right strengths can be increased by providing a pair at a distance.

[0023]

FIG. 1 is a block diagram showing an embodiment of the present invention.
A description will be given based on FIG. In the embodiment, the same components as those in the prior art shown in FIGS. 4 to 9 are denoted by the same reference numerals, and description thereof will be omitted.

FIGS. 1 and 2 show a first embodiment of the present invention.

In the figure, reference numeral 21 denotes a counter weight, which is a counter weight 7 of the prior art.
In substantially the same manner as described above, a hollow structure is formed by a front plate 22, a rear plate 23, left and right side plates 24, 24, an upper plate 25, a lower plate 26, and a pair of left and right mount members 27, 27 and the like. ing.

Here, each mounting member 27 of the counterweight 21 has a substantially rectangular plate 28 at its rear end.
Are welded and arranged at a distance from the rear face plate 23.
Each of the mounting members 27 has a lower end surface formed on the lower surface plate 2.
6 is welded to the left and right sides of the lower surface plate 26 at the position of the substantially U-shaped notch portion 26A formed at the front plate 22 at the front end side.
Welded to. The screw members 14 are welded to the respective mount members 27 so as to be positioned on the respective bolt insertion holes 27A.

29, 29 are the left of the counterweight 21;
It shows a pair of reinforcing plates spaced apart from each other in the right direction and disposed between each mounting member 27 and the upper surface plate 25. Each reinforcing plate 29 is formed of a steel plate having a predetermined thickness, and the lower end thereof is It is welded to the mount member 27 and each screw member 14. Each reinforcing plate 29 has a front end welded to the front plate 22 and a rear end 29A separated from the rear plate 23.

The upper end 29B of the reinforcing plate 29 is slightly separated from the upper plate 25 and is fixed to the upper plate 25 by welding to the side surface of the screw member 17 in order to prevent the occurrence of internal stress and the like. ing. A punched hole 30 is formed in the center of each reinforcing plate 29 so that the counterweight 7 can be used.
The weight adjusting material (not shown) filled in each
0 to smoothly distribute.

[0029] This embodiment according to the counterweight 21 has the above-described structure, filled with a weight adjusting material therein, the mounting parts 3A ₂ positioned to the rear of the rotating frame 3 via a respective mounting member 27 There is no particular difference from the prior art in that it can be mounted.

However, in this embodiment, each mounting member 2
7 is separated from the rear plate 23 so that the front plate 22, the lower plate 26
And the lower end of each reinforcing plate 29 is welded to each screw member 14 and each mount member 27, and the upper end 29B is screwed to the screw member 17
And the front end of the front plate 2
2, each mounting member 27 is connected to each reinforcing plate 29.
At the same time, they are integrally fixed to the front plate 22, the upper plate 25 and the lower plate 26.

Thus, in this embodiment, the strength of the entire counterweight 21 can be increased, the strength of each mounting member 27 and the screw member 17 and the like can be ensured. End 29A is attached to rear panel 23
This eliminates the need for welding, and can eliminate problems such as the occurrence of welding distortion on the surface of the rear face plate 23.

Therefore, according to the present embodiment, the rear plate 2 of the counterweight 21 which is a part of the external appearance of a hydraulic shovel or the like is provided.
3 The generation of irregularities on the surface can be effectively prevented, the appearance accuracy can be improved, and the entire counterweight 21 can be maintained at a desired strength.

Further, since each mount member 27 and reinforcing plate 29 are arranged to be separated from each other to the left and right and extend so as to extend forward and backward, the counterweight 21 is provided.
Can be further enhanced in the left and right directions. In addition, since a punching hole 30 is formed in the center of each reinforcing plate 29, when filling the weight adjusting material into the counterweight manufactured in the hollow structure, the punching hole 30 smoothly passes through the punching hole 30. Can be distributed.

Next, FIG. 3 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. To do
The feature of this embodiment is that a protruding portion 32 as a lifting and hanging bracket portion is integrally formed on the upper end 31B of each reinforcing plate 31.

Here, the front end and the lower end of each reinforcing plate 31 are the front plate 22 and the respective mounting members 27 and the screw members 14.
And the rear end 31 </ b> A is disposed apart from the rear face plate 23. The upper end 31B of each reinforcing plate 31 is slightly separated from the upper surface plate 25, and is integrally fixed to the upper surface plate 25 by welding the protrusion 32 to the upper surface plate 25. A punched hole 33 is formed in the center of each reinforcing plate 31, and an insertion hole 32 </ b> A for inserting a wire for lifting or hanging is formed in the protruding portion 32.

Thus, in the present embodiment having such a structure, substantially the same operation and effect as those of the first embodiment can be obtained, the strength as the counterweight can be sufficiently secured, and the appearance accuracy can be improved. be able to. Moreover, since the reinforcing plate 31 is integrally formed with the protruding portion 32 serving as a lifting / suspending bracket, the reinforcing plate and the bracket can be integrated, and the number of parts of the counterweight can be reduced. Can be.

[0037]

As described in detail above, according to the first aspect of the present invention, the mounting member is fixed to the lower plate and the front end side is fixed to the front plate. And a reinforcing plate extending in the front and rear directions is provided inside the hollow structure. The reinforcing plate has a lower end side as a mounting member and a screw member, an upper end side as an upper surface plate, and a front end side as a front side. respectively secured to the face plate, before Symbol reinforcing plate and the mounting member is spaced a rear end side from the rear plate, and count the reinforcing plate
Distribute the weight adjusting material filled inside the weight
Since the punched holes are provided , the strength of the entire counterweight can be effectively increased by the reinforcing plate. In addition, the mounting member and the reinforcing plate are separated from the rear plate, and welding distortion occurs on the surface of the rear plate. You can solve the problems such, Ki is possible to improve the product value by increasing the appearance accuracy of the counterweight, further a hollow structure counter
When filling the weight with the weight adjusting material,
Can be distributed smoothly through the Internet.

According to the second aspect of the present invention, the reinforcing plate is formed integrally with the bracket for lifting and suspending the counterweight at the upper end side so as to protrude from the upper surface plate. And the number of parts of the counterweight can be reduced.

According to the third aspect of the present invention, the mount member is fixed to the lower surface plate and the front end side is fixed to the front plate, and a screw member for attaching to the frame is provided on the upper surface side of the mount member. A bracket for lifting and suspending the counterweight is fixedly provided on the upper surface plate, and a reinforcing plate extending forward and backward is disposed inside the hollow structure. members, lifting the upper side, the lower bracket portion suspended, fixed respectively front side the front plate, before Symbol reinforcing plate and the mounting member is spaced a rear end side from the rear plate, and an internal counterweight the reinforcing plate To
Since the punching holes are provided to allow the weight adjusting material to be filled, the problem that welding distortion occurs on the surface of the rear face plate can be solved in the same manner as in the invention of claim 1, and the counterweight In addition to improving the appearance precision as a product, it is possible to improve the product value and inside the counterweight with a hollow structure
When filling the weight adjustment material into the
Can be distributed.

Further, according to the fourth aspect of the present invention, a pair of mounting members are provided left and right apart from each other, and the reinforcing plate is located between each mounting member and the upper surface plate and separated left and right. The strength of the counterweight in the left and right directions can be further increased.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a counterweight according to a first embodiment.

FIG. 2 is an enlarged sectional view taken in the direction of arrows II-II in FIG.

FIG. 3 is a sectional view similar to FIG. 2, showing a second embodiment.

FIG. 4 is a perspective view of a conventional hydraulic excavator.

FIG. 5 is an exploded perspective view of a conventional turning frame and a counterweight.

FIG. 6 is a plan view of a conventional counterweight.

FIG. 7 is a front view of the counterweight according to the related art, which is partially broken.

FIG. 8 is a bottom view of a conventional counterweight.

FIG. 9 is an enlarged sectional view taken in the direction of arrows IX-IX in FIG. 7;

[Explanation of symbols]

14 Screw Member 17 Screw Member (Bracket) 21 Counter Weight 22 Front Plate 23 Rear Plate 24 Side Plate 25 Top Plate 26 Lower Plate 27 Mounting Member 29, 31 Reinforcement Plate 30, 33 Punched Hole 32 Projection ( Bracket ) 32A Insertion hole

Claims (4)

(57) [Claims] 1. A hollow structure comprising a front plate, a rear plate, an upper plate, a lower plate and left and right side plates for filling the inside with a weight adjusting material, wherein the lower plate has a mounting member for mounting. Wherein the mounting member is fixed to a lower surface plate and a front end side is fixed to a front plate, and a screw member for mounting to a frame is provided on an upper surface side of the mounting mount; provided with reinforcing plate before, extending to the rear direction, the reinforcing plate to the mounting member and the screw member lower end, the upper end surface to the upper plate, fixed respectively front side the front plate, before Symbol reinforcement The rear end of the plate and the mounting member are separated from the rear plate , and the reinforcing plate is filled inside the counterweight.
Counterweight, characterized in that it has a structure in which Ru is provided a punching hole for circulating the weight adjusting material. 2. The counterweight according to claim 1, wherein the reinforcing plate has a counterweight lifting and hanging bracket portion integrally formed at an upper end thereof so as to protrude from an upper surface plate. 3. A hollow structure comprising a front plate, a rear plate, an upper plate, a lower plate, and left and right side plates for filling the inside with a weight adjusting material, wherein the lower plate has a mounting member for mounting. Wherein the mounting member is fixed to the lower surface plate and the front end side is fixed to the front surface plate, and a screw member for attaching to a frame is provided on the upper surface side of the mounting member; A bracket for lifting and suspending the counterweight is fixedly provided, and a reinforcing plate extending forward and rearward is disposed inside the hollow structure. The reinforcing plate has a lower end side connected to the mount member and the screw member. , said upper side lifting and lowering bracket unit suspended, fixed respectively front side the front plate, before Symbol reinforcing plate and the mounting member is spaced a rear end side from the rear face plate and the reinforcing plate count It is filled with weights
Counterweight, characterized in that it has a structure in which Ru is provided a punching hole Ru was circulated weight adjusting material. 4. A pair of said mounting members are provided left and right apart from each other, and said reinforcing plate is provided between said mounting members and an upper surface plate and provided as a pair left and right apart. 1,
The counterweight according to 2 or 3 .