JPH11200420A - Counterweight of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost of a counterweight attached to a construction machine, by using inexpensive materials for the heavy object of the counterweight. SOLUTION: The heavy object 9 of a counterweight attached to a construction machine is formed by mixing a high-specific-gravity artificial aggregate into cement 8 used for fixing small amounts of iron ores 5, 5... and small amounts of pieces 6, 6,... of scrap iron, the artificial aggregate using an oxidized slug which is the byproduct of steel purification. The iron ores 5, 5... and the pieces 6, 6,... of scarp ion are solidified together using the cement 8 mixed with the artificial aggregate and are packed in position inside a frame 2 to fabricate an inexpensive counterweight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hydraulic excavator,
The present invention relates to counterweights for construction machines such as backhoes, crawler cranes, truck cranes, all terrain cranes, and the like, and more particularly to heavy loads to be filled in the counterweights.

[0002]

2. Description of the Related Art A conventional counterweight of this type will be described with reference to FIG. In the figure, a counterweight 1 is a frame 2 made of a steel plate or the like and having an open top, a lid 3 for covering the upper surface of the frame 2, and a back body fixed to the back of the frame 2. , A large amount of iron ore 5, 5,..., Iron scraps 6, 6,... And sand 7, 7,. The counterweight 1 is formed by filling the weight 9 which is fixed by the above, and covering the lid 3.

[0003]

The above-mentioned counterweight is formed by mixing a large amount of iron ore, sand and sand with heavy materials to be filled in the frame, and fixing the mixture with cement. In order to achieve the target weight, the heavy object requires an extremely large amount of iron ore and iron scrap, which causes an increase in cost.

[0004] Therefore, a counterweight in which a heavy object is filled into the frame of the counterweight to achieve a target weight, which should be solved in order to reduce the cost of the heavy object and to manufacture an inexpensive counterweight. A technical problem arises, and an object of the present invention is to solve the problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and is a construction machine in which an upper revolving structure is swingably suspended above a lower traveling structure. In a counterweight attached to the rear of the upper revolving structure of a construction machine and filled with a heavy material, the filling of the counterweight is a cement for fixing a small amount of iron ore and a small amount of iron shavings. In addition, oxidized slag (slug) obtained in the electric furnace steelmaking process is crushed and granulated in a high temperature state, and a large amount of ceramic-based artificial aggregate obtained by quenching is mixed to fix the small amount of iron ore and iron scrap It is an object of the present invention to provide a counterweight of a construction machine which is constructed and fills the weight into a frame of the counterweight.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of explanation, technical matters belonging to the related art are also described at the same time, and the same reference numerals are used for the target parts. FIG. 1 shows a hydraulic excavator 10 as an example of a construction machine. The hydraulic excavator 10 has an upper revolving structure 12 rotatably suspended above an undercarriage 11, and a cab 13 and a machine cab 14 in which an engine, hydraulic equipment, and the like are installed are installed on the upper revolving structure 12. At the front of the upper revolving unit 12, a working machine 18 is mounted, in which a boom 15, an arm 16, and a bucket 17 are connected to each other so as to be swingable. Furthermore,
A counterweight 1 is attached to a rear portion of the upper revolving unit 12 for stabilizing the vehicle body.

As shown in FIG. 2, the counterweight 1 is a box-shaped frame 2 made of a steel plate having a predetermined thickness, and the frame 2 has an open upper surface. From a small amount of iron ore 5,5 ... and a small amount of iron scrap 6,6 ...
, And iron and steel stones 5,5 ... and iron scraps 6,6 ...
The cement 8 for fixing the slag, which is a by-product obtained in the steelmaking process of the electric furnace instead of the conventional sands 7, 7, ..., that is, the impurities contained in the iron ore at a high temperature. A ceramic artificial aggregate 19 obtained by crushing and granulating the mixture and quenching the mixture is mixed by a mixer 20, and the mixture is poured into the frame 2 and the small amount of iron ore 5,
5 and iron scraps 6, 6 are fixed and fixed in the frame 2 while being cemented by the cement 8 mixed with the artificial aggregate 19. Further, the lid 3 is covered with the upper surface opening. It is configured by mounting.

A back body 4 is fixed to the back of the box-shaped frame 2, and both side portions 4a, 4a of the back body 4 are provided.
Protrudes outward from both sides of the frame body 2. Bolt holes 4 b, 4 b are formed in the protrusions in the frames 12 a, 12 a of the upper swing body 12, and as shown in FIG. The counterweight 1 is brought into contact with the rear part of the revolving unit 12, and both side parts 4 a, 4 a of the back body 4 are
The counterweight 1 is fixed to the rear part of the upper revolving unit 12 with the bolts 21 and 21 through the bolt holes 4b and 4b. However, the means for fixing the counterweight 1 to the upper swing body 12 is not limited to this. In addition, the box-shaped frame 2 should not be limited to the above-mentioned shape, and the back body 4 may not be fixed.

Thus, when the excavator 10 having the counterweight 1 mounted on the rear portion of the upper revolving unit 12 excavates and loads earth and sand by the work implement 18 while traveling and turning, the vehicle body balance is maintained. A smooth operation can be performed.

As described above, the present invention relates to iron ore stones 5, 5...
Since artificial iron aggregates 19 having a high specific gravity are mixed with the cement 8 for fixing the steel stones 6, and the steel stones 5, 5,... And the iron scraps 6, 6,. 5,5
… And iron scraps 6,6… no longer need to be used.
Steel stones necessary to achieve the target weight as 5, 5, ...
And the amount of iron scraps 6, 6,... Can be significantly reduced.

Further, since the artificial aggregate 19 has fine irregularities on the surface of the grains, it has good adhesion to the cement 8 when it is consolidated by the cement 8, and therefore, the counterweight 1 Even if a crack or the like occurs in the frame 2, the weight 9 filled in the frame 2 does not inadvertently flow out of the crack, and the function as the counterweight 1 is reduced. There is no.

Further, unlike the general aggregate, the artificial aggregate 19 is advantageous for corrosion because it does not contain clay, organic impurities, salt and the like, and therefore, the frame of the counterweight 1 The body 2 is also prevented from being damaged by corrosion.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

[0014]

As described in detail in the above embodiment, the present invention uses a heavy material used as a counterweight to convert a small amount of iron ore and a small amount of iron scrap into an oxidized product which is a by-product generated during steel refining. The slag is formed by crushing and granulating slug in a high temperature state and solidifying with a cement mixed with a ceramic-based artificial aggregate obtained by quenching. Since the artificial aggregate has a high specific gravity, the target weight as the counterweight can be achieved even with a very small amount of iron ore and iron scrap compared to the conventional product. Thus, the iron ore and iron scrap are expensive, but the iron and stone and iron scrap are small in quantity as described above, and the production cost of the artificial aggregate is almost zero. In addition, the production cost of the counterweight was significantly reduced.

Further, the artificial aggregate is different from general aggregate,
The invention has a very great effect, for example, it has corrosion resistance, so that the frame made of steel is prevented from being damaged by corrosion.

[Brief description of the drawings]

FIG. 1 is a side view showing a state in which a counterweight according to an embodiment of the present invention is mounted on a hydraulic excavator.

FIG. 2 is an explanatory perspective view showing a manufacturing state of the counterweight according to the embodiment of the present invention.

FIG. 3 is a partially cutaway plan view showing a state in which the counterweight according to the embodiment of the present invention is attached to a rear portion of an upper swing body of a construction machine.

FIG. 4 is an explanatory perspective view showing a manufacturing state of a conventional counterweight.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Counterweight 2 Frame 3 Lid 4 Back body 5 Iron ore stone 6 Iron scrap 8 Cement 9 Heavy load 10 Hydraulic excavator 11 Lower traveling body 12 Upper revolving body 19 Artificial aggregate

Claims (1)

[Claims] 1. A construction machine in which an upper revolving structure is rotatably suspended above an undercarriage, and is attached to a rear portion of the upper revolving structure of the construction machine and is filled with heavy objects. In the counterweight, the filling of the counterweight is converted into cement for fixing a small amount of iron ore and a small amount of iron swarf, and an oxide slag (sl) obtained in an electric furnace steelmaking process.
ug) is crushed and granulated in a high temperature state, and a large amount of ceramic artificial aggregate obtained by quenching is mixed to fix the small amount of iron ore and iron scraps. Counterweight for construction machinery, characterized by being filled into a counterweight.