JP3165368B2 - Counterweight mounting device - 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 mounting device for a construction machine such as a hydraulic excavator or a crawler crane, and more particularly to a counterweight mounting device capable of adjusting a gap between a counterweight and a building.

[0002]

2. Description of the Related Art As shown in FIGS. 9A and 9B, a construction machine such as a hydraulic shovel or a crawler crane has a traveling body 5.
And an upper revolving unit 15 rotatably provided on the traveling unit 5
And a boom 2 as a working arm provided at the front end of the upper swing body 15 so as to be able to be lowered. The upper revolving unit 15 is mounted on the frame 1 for mounting an engine or a hydraulic device as a driving source, and is mounted on the frame 1 to house the engine or the hydraulic device and the like to protect them from the wind and rain. And a driver's cab 16.
At the rear end of the upper revolving structure 15, a counterweight 4 for balancing the vehicle body during work is attached. Since the weight of the counterweight 4 increases as the size of the vehicle body increases, the counterweight 4 is detachably attached to the upper swing body 15 so as to be detached from the frame 1 and transported separately from the vehicle body during transportation. It is configured so that it can be divided into a plurality.

FIG. 10 shows an example of a counterweight that can be divided. In FIG. 10, the counter weight 4 is composed of an outer counter weight 4A and an inner counter weight 4B.
In the example shown in (a), the outer counterweight 4A is formed in a U-shape, and is attached so that the inner counterweight 4B is wrapped by the concave portion of the outer counterweight 4A when attached to the frame 1. FIG.
In the example shown in (a), the inner counter weight 4
B is hidden from view by the outer counterweight 4A because it is hidden by the outer counterweight 4A. FIG.
(B) is such that an inner counterweight 4B having the same width as the outer counterweight 4A is attached to the frame 1 in series. In the example shown in FIG. 10B, the weight of the entire counterweight can be easily adjusted by appropriately increasing or decreasing the number of inner counterweights 4B.

A plurality of first through holes are formed in the inner counter weight 4B and the outer counter weight 4A at corresponding positions, and the inner counter weight 4B is different from the through holes. A plurality of second through holes are formed at positions. In order to attach the outer counterweight 4A and the inner counterweight 4B thus divided to the frame 1,
First, a bolt is inserted into the second through hole of the inner counterweight 4B and attached to the bracket of the frame 1, and then, while the outer counterweight 4A is in contact with the inner counterweight 4B, both counterweights 4A, 4B
A bolt is inserted into the first through-hole and is attached to the bracket of the frame 1 with a nut.

[0005] As described above, the counter weight is changed to the frame 1
At the time of attachment, a gap is formed between the building 3 and the counterweight 4. However, due to manufacturing tolerances of the counterweight 4, the building 3 or the frame 1, the size of the gap may be different between the upper and lower sides or the left and right sides of the counterweight 4, and the appearance of the construction machine to which the counterweight 4 is attached is deteriorated. Therefore, in order to make this gap constant, for example, the technique disclosed in
As shown in the publication, a spacer is inserted between the counterweight and the bracket of the frame so that the gap between the counterweight and the building is constant. This spacer is formed of a rectangular plate-like member having a hole in the center, and a bolt for mounting the counterweight is inserted into this hole so that the spacer is mounted between the counterweight and the bracket.

When the counterweight is divided into an inner counterweight and an outer counterweight, not only the gap between the outer counterweight or the inner counterweight and the building, but also the gap between the inner counterweight and the outer counterweight. Adjustment of the gap between them may also be necessary. For example, FIG.
In the example shown in (a), the inner counter weight 4
Since B is hidden by the outer counterweight 4A and cannot be seen, only the gap between the outer counterweight 4A and the building 3 needs to be adjusted. In the example shown in FIG. 10B, the inner counterweight 4B is exposed. Therefore, it is necessary to adjust both the gap between the inner counterweight 4B and the building 3 and the gap between the inner counterweight 4B and the outer counterweight 4A. In this case as well, a spacer is inserted between the inner counterweight 4B and the outer counterweight 4A, thereby adjusting the gap between the inner counterweight 4B and the outer counterweight 4A.

[0007]

However, in order to adjust the gap by the spacer described in Japanese Utility Model Application Laid-Open No. Sho 59-192090, it is necessary to insert the spacer once, fix the counterweight to the frame, and then adjust the gap. In order to increase or decrease the number of spacers, it is necessary to fix the counterweight once, remove the counterweight, change the number of spacers, and attach the counterweight again. For this reason, it is necessary to repeat attachment and detachment of the counterweight until the gap becomes constant, and the work efficiency has been extremely poor.

An object of the present invention is to provide a counterweight mounting device capable of efficiently adjusting a gap between a counterweight and a building.

[0009]

The present invention according to the first aspect of the present invention is directed to a counter weight 4 attached to a counter weight mounting portion 1A at the rear end of the upper revolving structure 1, 3. The present invention is applied to a counterweight mounting device for forming and mounting predetermined gaps L1, L2, L3, L4 between the mounting surface of the counterweight 4 and the building 3. The above object is achieved by the following configuration. The counterweight 4 has grooves 20a to 2a having a predetermined depth and opening on the outer surface thereof.
0c and a plurality of through-holes 4c to 4e extending from one side of the building side of the groove toward the mounting surface, and each of the through-holes adjusts a gap between the mounting surface and the building. A plurality of adjusting means 6, 7, 8, 9 are provided, each of which is projected from the groove through the through hole to the mounting surface, and the contact part 6 is provided at the tip of the building side. The length L of the contact portion protruding from the mounting surface can be adjusted.

According to a second aspect of the present invention, the counterweight 4 is an outer counterweight 4A.
And adjusting means 6, 7, 8, and 9 are provided for the outer counter weight 4A and the inner counter weight 4B, respectively.

Referring to FIG. 2, according to a third aspect of the present invention, there is provided a counterweight mounting apparatus according to the first or second aspect, wherein the adjusting means comprises a bolt 9 having a contact portion 6 provided at a tip thereof. And a nut 7 provided in the groove to adjust the protruding length of the bolt 9.

Referring to FIG. 7, the counterweight mounting device according to claim 4 is characterized in that the adjusting means comprises an inclined surface 25 formed at a position on the mounting surface of the counterweight 4 where each adjusting means is provided. Inclined surface 6 abutting on inclined surface 25
a, and the protrusion length of the distal end portion can be adjusted by moving the bocce 6 on the inclined surface 25 of the counterweight 4.

According to the first aspect of the present invention, the gap between the counterweight 4 and the building 3 is adjusted by adjusting the length of the abutting portion protruding from the mounting surface of the counterweight 4.

According to a second aspect of the present invention, in the counterweight mounting device, the counterweight 4 is an outer counterweight 4A.
And the inner counter weight 4B, the adjusting means 6, 7, 8, 9 provide the inner counter weight 4B.
Not only the gap between B and the building 3 but also the gap between the inner counterweight 4B and the outer counterweight 4A is adjusted.

According to a third aspect of the present invention, the projecting length of the adjusting means is adjusted by adjusting the projecting length of the notch 6 with the bolt 9 and fastening the bolt 9 with the nut 7 at the position where the predetermined projecting length is obtained. To adjust.

In the counterweight mounting device according to the fourth aspect, the protrusion 6 is adjusted by moving the boch 6 on the inclined surface 25 formed on the counterweight 4.

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 for easy understanding of the present invention. However, the present invention is not limited to this.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described. FIG. 1 is a view showing an outer counterweight according to a first embodiment of the present invention, and FIG.
FIG. 3 is a view showing an inner counterweight, and FIG. 4 is a view showing a state where the counterweight is attached to a frame. As shown in FIG. 1, two mounting bolt holes 4a and 4b are formed in the outer counterweight 4A. Grooves 20a, 20b, and 20c are formed on the upper and lower end surfaces of the outer counterweight 4A, and holes 4c, 4d, and 4e correspond to the positions of the grooves 20a, 20b, and 20c. It is formed from the side.

As shown in FIG. 2, a bolt 9 having a bolt 6 attached to its tip is inserted into each of the holes 4c to 4e (hereinafter, represented by the hole 4c), and penetrates to the position of the groove 20a. The bolt 6 is formed in a block shape from a non-elastic material such as a steel material, and is fixed to the tip of the bolt 9. Then, nuts 7A and 7B are screwed into the bolt 9 penetrating to the groove 20a via washers 8A and 8B, and the bolt 6 is attached to a position corresponding to the groove 20a. That is, the bolt 9 into which the nut 7A and the washer 8A are inserted is inserted into the hole 4 from the mounting surface side of the outer counterweight 4A.
c, the bolt 9 is penetrated to the position of the groove 20a, and another nut 7B and a washer 8B are further inserted.
Botto 6 is fixed to outer counterweight 4A. Therefore, the height L of the notch 6 from the mounting surface of the outer counterweight 4A can be adjusted by loosening the two nuts 7A and 7B and adjusting the insertion amount of the bolt 9 into the groove 20a. Although FIG. 2 illustrates the boss 6 attached to the groove 20a, the attachment of the botch 6 is the same for the other grooves 20b and 20c, and therefore, a detailed description will be given in this embodiment. Is omitted.

As shown in FIG. 3, holes 4f, 4b, through which bolts passing through the outer counterweight 4A penetrate, are formed in the inner counterweight 4B at positions corresponding to the mounting bolt holes 4a, 4b of the outer counterweight 4A. 4
g is formed, and the inner counterweight 4
Mounting bolt hole 4 for mounting B itself to the frame
h, 4i are formed.

Next, the mounting of the inner counterweight 4B and the outer counterweight 4A will be described. As shown in FIG. 4, first, the mounting bolts 11 are inserted into the mounting bolt holes 4h and 4i of the inner counterweight 4B.
B, and the mounting bolts 11B are inserted into holes (not shown) corresponding to the holes 4h and 4i formed in the counterweight mounting bracket 1A (hereinafter referred to as a bracket) mounted on the rear of the frame 1. The nut 13 is screwed into the mounting bolt 11B, and the inner counterweight 4B is mounted on the bracket 1A. Next, the outer counterweight 4A is attached so as to cover the inner counterweight 4B. First, a mounting bolt 11A longer than the mounting bolt 11B is inserted into the mounting bolt holes 4a, 4b of the outer counterweight 4A, and the ends of the bolts 11A correspond to the holes 4f, 4g, and further the holes 4f, 4g of the inner counterweight 4B. The nut 13 is screwed into the mounting bolt 11A, and the outer counterweight 4A is attached to the bracket 1A.

FIG. 5 is a view showing a gap formed between the outer counterweight 4A and the building 3. As shown in FIG. 5, gaps L1 and L2 and gaps L3 and L4 are formed between the outer counterweight 4A and the building 3, respectively. In order to make the sizes of the gaps L1 to L4 constant, first,
The nut 13 screwed to the mounting bolt 11A is loosened to release the fixing of the outer counterweight 4A to the bracket 1A. After loosening the nut 13, the grooves 20a, 20b,
A tool such as a spanner is inserted between the inner counterweight 4B and the inner counterweight 4B and the outer counterweight 4A to loosen the two nuts 7A and 7B. Then, the gap L1 to L4 is adjusted by adjusting the height L of the notch 6 with respect to the mounting surface of the outer counterweight 4A. For example, the gap L
If L1 and L3 are larger than the gaps L2 and L4, the groove 20
a, the height L of the bottom 6 is reduced, and if the gaps L1 and L2 are smaller than the gaps L3 and L4,
b, the height L of the boss 6 attached to 20c is increased. After adjusting the size of the gaps L1 to L4, a tool such as a spanner is inserted between the grooves 20a, 20b, 20c and the inner counterweight 4B and the outer counterweight 4A to tighten the two nuts 7A, 7B. Then, the nuts 13 screwed to the mounting bolts 11A are tightened to complete the adjustment of the gaps L1 to L4.

By adjusting the size of the gaps L1 to L4 in this manner, the size of the gaps L1 to L4 can be adjusted without removing the outer counterweight 4A. By doing so, the appearance of the construction machine can be improved.

Next, a second embodiment of the present invention will be described. FIG. 6 is a view showing a counterweight mounting device according to a second embodiment of the present invention. As shown in FIG. 6, a bolt 9 having a notch 6 at the tip is inserted into holes 4c, 4d, 4e formed in the outer counterweight 4A shown in FIG. The counterweight 4A is mounted so that the height L can be adjusted from the mounting surface. In the second embodiment of the present invention, the shim 10 having the U-shaped notch 10A having various thicknesses is inserted between the bocce 6 and the mounting surface of the outer counterweight 4A, thereby increasing the height. By adjusting the length L, the gaps L1 to L4 between the outer counterweight 4A and the building 3 are adjusted.
The adjustment of the gaps L1 to L4 according to the second embodiment is performed as follows.

First, the nut 13 screwed to the mounting bolt 11A is loosened to release the fixing of the outer counterweight 4A to the bracket 1A. After loosening the nut 13,
A nut 7 is loosened by inserting a tool such as a wrench into the grooves 20a, 20b, 20c. Then, in order to adjust the height L of the notch 6 with respect to the mounting surface of the outer counterweight 4A, a shim 10 having a thickness suitable for the size of the gap to be adjusted is inserted between the notch 6 and the mounting surface. Then, the notch 10A of the shim 10 is engaged with the bolt 9. For example, the gap L
If L1 and L3 are larger than the gaps L2 and L4, the groove 20
In order to increase the height L of the boss 6 attached to the b, 20c, the shim 10 is inserted between the boss 6 and the mounting surface. After adjusting the size of the gaps L1 to L4, a tool such as a spanner is inserted into the grooves 20a, 20b, and 20c to tighten the nut 7, and the nut 13 screwed to the mounting bolt 11A is tightened to tighten the gaps L1 to L4. The adjustment of is ended.

As described above, by inserting the shim 10 having the U-shaped notch 10A and adjusting the height L, the size of the gap can be adjusted without removing the outer counterweight 4A also in the present embodiment. .

In the second embodiment of the present invention, bolts 9 are inserted into holes 4c, 4d, and 4e formed in outer counterweight 4A, and are attached to outer counterweight 4A by nuts 7 and washers 8. However, the holes 4c, 4d, and 4e may be screw holes, the bolt 9 may be screwed into the screw holes, and the height L may be adjusted by rotating the bolt 9. This eliminates the necessity of using the shim 10 and makes it possible to adjust the gaps L1 to L4 more efficiently.

Next, a third embodiment of the present invention will be described. FIG. 7 is a view showing a counterweight mounting device according to a third embodiment of the present invention, FIG. 7 (a) is a cross-sectional view taken along the line II in FIG. 1, and FIG. 7 (b) is FIG.
FIG. 7A is a view in the direction of arrow A, and FIG. 7C is a view in the direction of arrow B in FIG. As shown in FIG. 7, an inclined surface 25 is formed in a portion on the mounting surface side near the groove 20a of the counterweight 4A shown in FIG. And this slope 2
At approximately the center of 5, a groove 26 is formed which extends to a portion where the inclined surface 25 and the mounting surface intersect. An inclined surface 6a having substantially the same inclination angle as the inclined surface 25 is formed on the bolt 9 side of the bocce 6, and the inclined surface 6a and the inclined surface 25 of the outer counterweight 4A are brought into abutment, and the nut 7 is formed.
Further, the bolt 9 is fixed to the outer counterweight 4A by the washer 8. The gap L according to the third embodiment
Adjustment of 1 to L4 is performed as follows.

First, the nut 13 screwed to the mounting bolt 11A is loosened to release the fixing of the outer counterweight 4A to the bracket 1A. After loosening the nut 13,
A nut 7 is loosened by inserting a tool such as a wrench into the grooves 20a, 20b, 20c. Then, in order to adjust the height L of the boss 6 with respect to the mounting surface of the outer counterweight 4A, the botch 6 is moved up and down along the inclined surface, and the height L of the botch 6 with respect to the mounting surface of the outer counterweight 4A is adjusted. To adjust the gaps L1 to L4. For example, the gap L
If L1 and L3 are larger than the gaps L2 and L4, the groove 20
a is moved upward along the inclined surface 25 to reduce the height L, and the gaps L1 and L2 are
If it is smaller than 3 and L4, the height L is increased by moving the bottom 6 attached to the groove 20b downward along the inclined surface 25. After adjusting the sizes of the gaps L1 to L4, a tool such as a spanner is inserted into the grooves 20a, 20b, and 20c to tighten the nut 7, and the nut 13 is tightened to complete the adjustment of the gaps L1 to L4.

Next, a fourth embodiment of the present invention will be described. FIG. 8 is a diagram showing a counterweight mounting device according to a fourth embodiment of the present invention. As shown in FIG. 8, a botto 6 'made of an elastic member such as rubber or plastic is provided between the outer counterweight 4A and the inner counterweight 4B. The notch 6 'is attached to the outer counterweight 4A by a bolt (not shown). Further, in the fourth embodiment of the present invention, the grooves 20a, 20b, and 20c as in the outer counterweight 4A shown in FIG.
The outer counterweight 4A is mounted on the bracket 1A by inserting the mounting bolts 11 into c, 4d and 4e.

Then, by adjusting the torque at the time of mounting the mounting bolt 11, the boss 6 'made of an elastic member is deformed, and the gaps L1 to L4 between the outer counterweight 4A and the building 3 are adjusted. For example, when the gaps L1 and L3 are larger than the gaps L2 and L4, the tightening torque between the mounting bolt 11 and the nut 13 inserted into the hole 4c is increased to increase the amount of deformation of the boss 6 'near the hole 4c. .
If the gaps L1 and L2 are smaller than the gaps L3 and L4, the tightening torque between the mounting bolt 11 and the nut 13 inserted in the hole 4e is increased to increase the amount of deformation of the boss 6 'near the hole 4e. . Then, when the gaps L1 to L4 become substantially uniform, the adjustment of the gaps L1 to L4 ends.

As described above, in the fourth embodiment of the present invention, the gaps L1 to L4 can be adjusted only by changing the tightening torque between the mounting bolt 11 and the nut 13, so that the first to fourth gaps can be adjusted. Compared to the third embodiment,
Further, the gap can be easily adjusted.

In the above-described embodiment, when the construction machine is viewed from the side, the inner counterweight 4
Since B is hidden by the outer counterweight 4A, only the gap between the outer counterweight 4A and the building 3 is adjusted. However, the side surface of the inner counterweight 4B is as shown in FIG. In the case of exposure as shown in FIG.
The gap between B and the building 3 may be adjusted.
In this case, the counterweight mounting device according to the above-described first to fourth embodiments is replaced with the inner counterweight 4.
B, so that the gap between the inner counterweight 4B and the building 3 may be adjusted. Adjustment of the gap between the outer counterweight 4A and the inner counterweight 4B is performed in the same manner.

In the above embodiment, the counter weight 4 is divided into the outer counter weight 4A and the inner counter weight 4B. However, the counter weight 4 is divided into the outer counter weight 4A and the inner counter weight 4B. The present invention can be applied to a case where a counter weight is used. In this case, the counterweight mounting device according to the above-described first to fourth embodiments may be provided on the counterweight 4, and the gap between the counterweight 4 and the building 3 may be adjusted.

In the correspondence between the above-described embodiment and the claims, the frame 1 and the building 3 are the upper revolving unit, the bracket 1A is the counterweight mounting portion, and the
6 ', nut 7, washer 8, bolt 9, inclined surface 25,
The groove 26 constitutes the adjusting means.

[0036]

As described in detail above, the counterweight mounting apparatus according to the present invention adjusts the gap between the counterweight and the building without removing the counterweight, so that the work for adjusting the gap can be performed. It can be performed efficiently and the appearance of the construction machine can be improved.

[Brief description of the drawings]

FIGS. 1A and 1B show an outer counterweight according to a first embodiment of the present invention, wherein FIG. 1A is a front view of the outer counterweight viewed from its mounting surface, and FIG. 1B is a bottom view of FIG.

FIG. 2 is a sectional view taken along line II in FIG.

3A and 3B show an inner counterweight according to the first embodiment of the present invention, wherein FIG. 3A is a front view and FIG. 3B is a bottom view of FIG.

FIG. 4 is a partially cutaway front view showing a state where a counterweight is attached to a frame.

5A and 5B are diagrams showing a gap between a counterweight and a building, wherein FIG. 5A shows the right side of the construction machine, and FIG. 5B shows the left side of the construction machine.

FIG. 6 shows a counterweight mounting device according to a second embodiment of the present invention, where (a) is a cross-sectional view taken along line II of FIG. 1;
(B) is a right side view of (a).

7A and 7B are views showing a counterweight mounting device according to a third embodiment of the present invention, wherein FIG. 7A is a cross-sectional view taken along the line II in FIG. 1, and FIG. A of (a)
FIG. 7C is a view in the direction of arrow B in FIG. 7A.

8A and 8B show a counterweight mounting device according to a fourth embodiment of the present invention, wherein FIG. 8A is a cross-sectional view of a mounting bolt portion, and FIG.

FIG. 9A is a right side view of a construction machine (crane).
(B) is a left side view

10A and 10B are front views showing a counterweight composed of an outer counterweight and an inner counterweight, wherein FIG. 10A shows a concave outer counterweight, and FIG.
Figure shows a flat outer counterweight

[Explanation of symbols]

 Reference Signs List 1 frame 2 boom 3 building 4 counter weight 4A outer counter weight 4B inner counter weight 5 lower traveling body 6, 6 'boch 7 nut 8 washer 9 bolt 10 shim 11, 11A, 11B bolt 13 nut 25 inclined surface 26 groove

Claims (4)

(57) [Claims] 1. A counterweight mounting device for mounting a counterweight on a counterweight mounting portion at a rear end of an upper revolving structure with a predetermined gap formed between a mounting surface of the counterweight and a building. The counterweight has a plurality of grooves each having a predetermined depth that is open on the outer surface thereof, and a plurality of through holes extending from one side of the building toward the mounting surface. A plurality of adjusting means for adjusting a gap between the mounting surface and the building, each of the adjusting means penetrates the through hole from the groove to the mounting surface. A counterweight mounting device, wherein a projecting portion is provided with a contact portion at a tip of the building side, and a length of the contact portion protruding from the mounting surface is adjustable. 2. The apparatus according to claim 1, wherein said counterweight comprises an outer counterweight and an inner counterweight, and said groove, through hole and adjusting means are provided on said outer counterweight and said inner counterweight, respectively. The described counterweight mounting device. 3. The apparatus according to claim 1, wherein the adjusting means comprises a bolt provided with the abutting portion at a tip thereof, and a nut provided in the groove and adjusting a protruding length of the bolt.
Or the counterweight mounting device according to 2. 4. The adjusting means includes an inclined surface formed at a position on the mounting surface of the counterweight where the adjusting means is provided, and a botto having an inclined surface that comes into contact with the inclined surface. The counterweight mounting device according to claim 1 or 2, wherein a protrusion length of the distal end portion can be adjusted by moving a boch on an inclined surface of the counterweight.