JPH1129291A - Device and method for installing counterweight - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and method for installing a counterweight capable of increasing the accuracy of the mounting position of a counterweight and manufacturing easily at a low cost. SOLUTION: A counterweight supporting part 5 comprising right and left extended vertical beams is provided at the rear part of a swing table of a working machine. Also a block 11 having an inclined surface 11a which acts as a guide when it is fitted closely to a mounting groove is installed on the side surface of the right and left counterweight supporting part 5 or on the lower surface of the counterweight 6. To install the block 11, the amount of projection ΔW from the side surface of the counterweight supporting part 5 or the side surface of the mounting groove 7 is adjusted using shims 10. Then the mounting groove 7 provided in the lower surface of the counterweight 6 is fitted closely to the counterweight supporting part 5 through the block 7 so as to install the counterweight 6 on the counterweight supporting part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight for a working machine such as a crane, an excavator, a dismantling machine, a crushing machine, etc. for balancing a suspended load, a working tool, a load generated by a work, etc. on a rear portion of a revolving structure. Device and method for mounting.

[0002]

2. Description of the Related Art As shown in a side view of FIG. 3 and a rear view of FIG. 4A, in a working machine such as a crane, a traveling body is used to balance with a suspended load, a working tool or a working load. A revolving unit 3 is mounted on a revolving unit 2 on a base 1, a barge, or the like via a revolving unit 2, and a vertical beam of a main frame 4 of the revolving unit 3 is extended to a rear portion of the revolving unit 3 to support a counterweight. The counter weight support 5
A mounting groove 7 provided on the lower surface of the counterweight 6 is fitted and mounted.

[0003] The mounting of the counterweight 6 on the counterweight support portion 5 is performed by raising the A frame 8 attached to the rear portion of the revolving unit 3 and expanding and contracting a hydraulic cylinder (not shown) attached to the A frame 8. Do it using actions,
Alternatively, the counterweight 6 is mounted on the counterweight support 5 using another crane.

As described above, when the counterweight 6 is mounted on the counterweight support portion 5, the A frame 8
The counterweight 6
Is slowly lifted onto the counterweight support 5,
The mounting groove 7 is fitted to the counterweight support 5 while being slowly lowered onto the counterweight support 5, and is set. In this case, since the counter weight 6 is set with the front surface thereof being applied to the main frame 4 or the back surface of the counter weight 6 to be set in advance, the counter weight 6 and the main frame 4 are mounted in advance. No gap is formed in the front-rear direction with the counterweight 6 to be set, and the counterweight 6 is set at a predetermined mounting position.

However, there is a tolerance in both the counterweight support 5 and the counterweight 6, and particularly when the counterweight 6 is manufactured by casting, the tolerance becomes large. Therefore, as shown in FIG. The size of the gap G between the mounting groove 7 and the counterweight support 5 changes, and as a result, as shown in the plan view of FIG. Weight 6
A shift ΔL2 between them in the width direction occurs. In order to eliminate such deviations ΔL1 and ΔL2, it takes time to adjust the position after mounting the counterweight at the site.

In order to solve such a problem, Japanese Utility Model Laid-Open Publication No. Sho 58-170386 discloses a mounting groove 7 having a tapered shape having a narrow upper portion and an upper portion having a width corresponding to the width of the counterweight support portion 5. Is formed so as to be substantially equivalent to the mounting groove 7 for the counterweight support 5.
Are easily aligned, and the widthwise deviations ΔL1, ΔL
The counterweight 6 can be set to an accurate position without two.

[0007]

SUMMARY OF THE INVENTION
As described in Japanese Patent Application Laid-Open No. 8-170386, when the mounting groove 7 is formed in a tapered shape, the mounting groove 7 must be precisely machined by a grinder or the like, and there is a problem that the cost is increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a counterweight mounting apparatus and a mounting method which can improve the mounting position accuracy of the counterweight and can be manufactured easily and at low cost. Aim.

[0009]

In order to achieve the above object, a counterweight mounting device according to the present invention is provided with a counterweight support extending from a rear portion of a revolving structure of a working machine. A counterweight mounting device which is mounted by fitting a mounting groove provided at a lower portion of the counterweight into the counterweight supporting portion when the mounting groove of the counterweight is fitted into the counterweight supporting portion on a side surface of the counterweight supporting portion. A block having an inclined surface is provided, and a shim is provided between the block and the side surface of the counterweight support portion so that the amount of protrusion of the block from the side surface of the counterweight support portion can be adjusted. Features (Claim 1).

In the counterweight mounting device of the present invention, a counterweight support portion is provided extending from a rear portion of the revolving structure of the work machine, and a mounting groove provided below the counterweight is fitted into the counterweight support portion. In the counterweight mounting device, the block having an inclined surface serving as a guide when the mounting groove of the counterweight is fitted into the counterweight support is provided on a side surface of the mounting groove of the counterweight support. A shim is provided between the block and the side surface of the mounting groove so as to adjust the amount of protrusion of the block from the side surface of the counterweight mounting groove (claim 2).

According to the counterweight mounting method of the present invention, a counterweight support is extended and provided at the rear of the revolving structure of the work machine, and a mounting groove provided at a lower portion of the counterweight is fitted into the counterweight support. In the counterweight mounting method, the counterweight is attached to a side surface of the counterweight support, and has a slope that acts as a guide when the mounting groove is fitted into the counterweight support. A counterweight is attached to the counterweight support by adjusting the amount of protrusion from the side of the counterweight support by means of a shim provided between the counterweight support and the side of the support.

Further, according to the method of mounting a counterweight of the present invention, a counterweight support portion is provided extending from a rear portion of a revolving structure of a working machine, and a mounting groove provided at a lower portion of the counterweight is provided in the counterweight support portion. In the counterweight mounting method of being fitted and mounted, the block having a slope which is mounted on a side surface of a mounting groove of the counterweight and has a guiding function when the mounting groove is fitted into the counterweight support portion, The counterweight is mounted on the counterweight support by adjusting the amount of protrusion of the counterweight from the side of the mounting groove by means of a shim provided between the counterweight and the side of the mounting groove of the counterweight. ).

[0013]

In the present invention, the amount of protrusion of the block from the side surface of the counterweight support portion or the side surface of the counterweight mounting groove is adjusted by a shim, so that the counterweight support portion or the side surface of the counterweight mounting groove is adjusted. The protrusion amount of the block can be adjusted, the side surface of the mounting groove of the counterweight abuts closely on the side surface of the block, and the counterweight is accurately positioned in the width direction of the revolving structure. By adjusting the amount of protrusion of the block in this manner, it is not necessary to precisely machine the mounting groove of the counterweight into a tapered shape.

[0014]

FIG. 1 is a partial cross-sectional rear view showing an example of an apparatus for carrying out a method for mounting a counterweight according to the present invention. In the present embodiment, as shown in FIG. 3, a mounting plate having a screw hole 9a is provided on the outer surface of a counterweight support portion 5 composed of left and right vertical beams formed to extend behind the revolving structure 3. 9 and weld the shim 1 to the mounting plate 9.
The block 11 is mounted by applying a bolt 11 through a hole 0 and screwing a bolt 12 through a hole provided in the block 11 and the shim 10 and screwing into the screw hole 9a. In the upper part of the block 11, a tapered inclined surface 11a is provided to perform a guiding action so that the mounting groove 7 can be smoothly fitted when fitted.

The counterweight support 5 of the block 11
The protrusion amount ΔW on the side surface of the counterweight 6 is adjusted by the number of the shims 10, whereby the right and left mounting grooves 7
The distance W1 between the outer side surfaces 7a, 7a
11 (the distance W between the contact surfaces with the counterweight)
Slightly larger than 2. Such adjustment is performed so that the center position S of the counterweight 6 coincides with the center position of the revolving unit 3.

As described above, by adjusting the projecting amount ΔW of the block 11, the counterweight 6 can be simply set on the counterweight support 5 by the counterweight 6.
It is possible to set the position of the left and right direction accurately,
There is no need to adjust the left / right position after setting. Further, the mounting groove 7 does not need to be accurately machined into a tapered shape by a grinder or the like, and can be realized relatively easily.

FIG. 2 is a partial sectional rear view showing another embodiment of the present invention. In this embodiment, the block 11 is mounted upside down on the outer surface 7a of the mounting groove 7. In the case of the example, a screw hole 13 is provided in the mounting groove 7a, and the shim 10
The block 11 is fixed by bolts 12 via. Also in the present embodiment, adjustment is made so that the left and right positions of the counterweight 6 match the position of the revolving superstructure 3. According to this embodiment, the same operation and effect as those of the embodiment of FIG. 1 can be obtained.

In practicing the present invention, the block 11 may be mounted not on the outer surface 5a of the counterweight support portion 5 but on the inner surface 5b, and the blocks 11 are provided on both side surfaces 5a and 5b. You may. FIG.
When the block 11 is mounted on the mounting groove 7 side as shown in FIG. 7, the block 11 may be provided not on the outer side surface 7a but on the inner side surface 7b, and may be provided on both side surfaces 7a and 7b. Further, one of the blocks 11 is connected to the counterweight support 5.
And the other may be provided in the mounting groove 7. Further, the counterweight support portion 5 may be constituted by one or three or more members, instead of being constituted by left and right vertical beams.

[0019]

According to the present invention, it is possible to improve the accuracy of the mounting position of the counterweight in the left-right direction as compared with the conventional mounting structure in which the mounting groove of the counterweight is simply fitted into the counterweight support. The counterweight can be mounted quickly without the need for position adjustment work. In addition, since the block is mounted via the shim, a counterweight mounting device can be realized easily and inexpensively as compared with the case where a tapered groove is machined.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional rear view showing an example of an apparatus for implementing a method for attaching a counterweight according to the present invention.

FIG. 2 is a partially sectional rear view showing another embodiment of the present invention.

FIG. 3 is a side view of a crane having a conventional counterweight mounting structure.

FIG. 4A is a rear view of a conventional crane having a counterweight mounting device, and FIG. 4B is a partially enlarged view thereof.

FIG. 5 is a plan view for explaining a lateral displacement of a counterweight in a conventional counterweight mounting device.

[Explanation of symbols]

1: running body, 2: revolving device, 3: revolving body, 4: main frame, 5: counterweight support, 6: counterweight, 7: mounting groove, 8: A frame, 9: mounting plate, 1
0: Shim, 11: Block, 11a: Inclined surface, 12: Bolt, 13: Screw hole

Claims (4)

[Claims] 1. A counterweight mounting device in which a counterweight support is extended and provided at a rear portion of a revolving structure of a work machine, and a mounting groove provided at a lower portion of the counterweight is fitted into the counterweight support and mounted. A block having an inclined surface that acts as a guide when the mounting groove for the counterweight is fitted into the counterweight support is provided on a side surface of the counterweight support, and the block and the side of the counterweight support are provided. A counterweight mounting device, wherein a shim is provided between the first and second blocks so as to adjust an amount of protrusion of the block from a side surface of the counterweight support portion. 2. A counterweight mounting device, wherein a counterweight support is extended from a rear portion of a revolving structure of a work machine, and a mounting groove provided at a lower portion of the counterweight is fitted into the counterweight support and mounted. A block having an inclined surface that acts as a guide when the mounting groove of the counterweight is fitted into the counterweight supporting portion is provided on a side surface of the mounting groove of the counterweight support portion, and a side surface of the block and the mounting groove. And a shim for adjusting the amount of protrusion of the block from the side surface of the counterweight mounting groove. 3. A counterweight mounting method according to claim 1, wherein a counterweight support is extended at a rear portion of the revolving structure of the working machine, and a mounting groove provided at a lower portion of the counterweight is fitted into the counterweight support. A block attached to a side surface of the counterweight support portion and having an inclined surface that acts as a guide when the mounting groove is fitted into the counterweight support portion, between the counterweight support portion and the side surface; A counterweight mounting method, wherein the counterweight is mounted on the counterweight support by adjusting the amount of protrusion from the side surface of the counterweight support using a shim. 4. A counterweight mounting method according to claim 1, wherein a counterweight support is extended at a rear portion of the revolving structure of the work machine, and a mounting groove provided at a lower portion of the counterweight is fitted into the counterweight support. A block that is attached to the side surface of the mounting groove of the counterweight and has an inclined surface that acts as a guide when the mounting groove is fitted into the counterweight support, between the block and the side surface of the mounting groove of the counterweight. A counterweight mounting method, wherein the counterweight is mounted on a counterweight support by adjusting the amount of protrusion of the counterweight from the side surface of the mounting groove by means of a shim provided in the counterweight.