JP2000314154A - Counterweight and construction machine provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the change of the weight of a counter weight without displacing the location of a main weight backward. SOLUTION: A main weight 11 is mounted to a rear end part of a sluing frame, and a box-shaped hole 11a with a bottom is formed in the upper surface of the main weight 11 vertically along a vehicle. Thick-plate-shaped auxiliary weights 12-15 formed in a plurality of levels are laminated in the hole 11a with a bottom, and the auxiliary weights 12-15 are connected to the main weight 11 by through bolts 18 passed via through holes 12c-15c. The upper surface of the hole 11a with a bottom is covered with a cover 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight attached to a rear end of a vehicle and a construction machine having the counterweight.

[0002]

2. Description of the Related Art For example, in a construction machine such as a hydraulic excavator, a single machine performs various operations such as demolition work in addition to standard excavation work. In this case, the excavation reaction force differs greatly between the demolition work and the standard work, so it is necessary to change the specifications of the excavator according to the work form.In the demolition specification, the weight of the counterweight mounted on the rear of the vehicle is larger than the standard specification. Weight. Such a counterweight requiring a weight change is disclosed in, for example, Japanese Patent Laid-Open No. 7-31033.
No. 5 discloses this. According to the counterweight described in this publication, an auxiliary weight mounting chamber is provided between the main weight and the engine room in front of the main weight, and a plurality of auxiliary weights are removably mounted therein. Accordingly, the weight of the counterweight can be increased or decreased by a predetermined amount only by attaching and detaching the auxiliary weight without removing the main weight, and the specification of the hydraulic excavator can be easily changed.

[0003]

Incidentally, in today's work sites, there are often scenes in which a small turning type working machine having a small turning radius is applied, and the length (rear end radius) of the rear end of the vehicle is reduced. It is not preferable to make it longer. However, in the counterweight described in the above publication, the main weight is displaced toward the rear of the vehicle by an amount corresponding to the auxiliary weight mounting chamber, so that the length of the rear end of the vehicle becomes long.

It is an object of the present invention to provide a counterweight whose weight can be easily changed without increasing the length of a rear end portion of a vehicle, and a construction machine provided with the counterweight.

[0005]

(1) Referring to FIGS. 1 to 4 showing one embodiment, the invention of claim 1 is applied to a counterweight, and the counterweight is used for a vehicle frame 4. By having the main weight 11 attached to the rear end, and the auxiliary weights 12 to 15 for increasing and decreasing the weight, which are removably stored in a recessed space 11 a formed in the vehicle vertical direction from the upper surface of the main weight 11. The objectives achieved are achieved. (2) The invention according to claim 2 is that the auxiliary weight is composed of a plurality of segment members 12 to 15 stacked vertically. (3) The invention of claim 3 provides the segment members 12 to 15
Uneven members 12a, 12b, 13a, 13b, 14a, 14b for positioning with other segment members on the upper and lower stacked surfaces of
15a and 15b are provided respectively. (4) The invention according to claim 4 is that, on the upper surface of the main weight 11,
The cover 16 that covers the recessed space 11a is mounted. (5) According to the invention of claim 5, the recessed space 11a is formed so as to completely store all of the auxiliary weights 12 to 15 in the space 11a. (6) The invention according to claim 6 is directed to the traveling body 1, the turning frame 4 rotatably provided on the traveling body 1, the working device 5 attached to the vehicle front end of the turning frame 4, and the working device 5. This is applied to a construction machine provided with a counterweight 10 attached to the rear end of the turning frame 4 in the vehicle so as to oppose the reaction force of the turning frame 4. The counterweight 10 is connected to the main weight 1 attached to the turning frame 4.
The above-mentioned object is achieved by having the weight 1 and auxiliary weights 12 to 15 for increasing and decreasing the weight, which are removably stored in a recessed space 11a formed in the vehicle vertical direction from the upper surface of the main weight 11.

[0006] 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 to make the present invention easy to understand. However, the present invention is not limited to this.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a side view (partially sectional view) of the hydraulic shovel equipped with the counterweight according to the present embodiment. As shown in FIG. 4, the excavator includes a lower traveling unit 1 and a lower traveling unit 1 through a turning wheel 2.
And an upper revolving body 3 that is pivotably connected to the upper part of the vehicle. The revolving frame 4 of the upper revolving unit 3 is provided with a work attachment 5, a cab 6, a machine room 7, and a counterweight 10.

FIG. 1 is a plan view of the counterweight 10 according to the present embodiment (A view in FIG. 4), and FIG.
FIG. 2 is a sectional view taken along line II. As shown in FIGS. 1 and 2, the counterweight 10 includes a main weight 11 and auxiliary weights 12 to.
15. The main weight 11 is the revolving frame 4
A box-shaped bottomed hole 11a (recess space) is formed in the center of the upper surface of the main weight 11 in the vertical direction of the vehicle. A first-stage auxiliary weight 12, a second-stage auxiliary weight 13, a third-stage auxiliary weight 14, and a fourth-stage auxiliary weight 15 (each of which is referred to as a segment member) are vertically stacked in the bottomed hole 11a. The weights 12 to 15 are completely stored inside the hole 11a without protruding from the bottomed hole 11a. A cover 16 is detachably mounted on the upper surface of the main weight 11 by bolts 17, and the cover 16 is provided with a bottomed hole 11a.
Is covered. The main weight 11 is manufactured by casting using a sand mold, and the auxiliary weights 12 to 15 are manufactured by a thick plate or casting.

FIG. 3 is a perspective view of the first-stage auxiliary weight 12. As shown in FIG. The other auxiliary weights 13 to 15 are the same as in FIG. As shown in FIG. 3, the bottom of the auxiliary weight 12 is provided with two right and left convex portions 12a, and the top surface is provided with two right and left concave portions 12b corresponding to the convex portions 12a. Further, as shown in FIG. 2, concave portions 11b are provided on the bottom surface of the bottomed hole 11a of the main weight 11 at two positions on the left and right corresponding to the convex portions 12a. A convex portion 12a of the first stage counterweight 12 and a concave portion 11b of the main weight 11;
The convex portion 13a of the stage counter weight 13 and the concave portion 12b of the first stage counter weight 12, the third stage counter weight 1
4 and the recess 1 of the second stage counterweight 13
3b, and the projection 15a of the fourth stage counterweight 15
And the recesses 14b of the third-stage counterweights 14 are loosely fitted, whereby the positions of the auxiliary weights 12 to 15 are determined.

The auxiliary weights 12 to 15 are provided with two through holes 12c to 15c, respectively.
c to 15c, the through bolt 18 penetrates, and the through bolt 18
Is screwed into a screw portion 11c provided on the main weight 11. Thereby, the auxiliary weights 12 to 15 are fixed to the main weight 11. In addition, the auxiliary weight 12
Screws 12d to 15 for attaching hanging tools are provided on the upper surface of
d are provided respectively.

Next, a procedure for changing the specifications of the counterweight 10 according to the present embodiment will be described. (1) Standard specification For standard work where the excavation reaction force is not so large, a hydraulic excavator is used as a standard specification. In this standard specification, it is not necessary to make the counterweight 10 heavy, and the counterweight 10 is composed of only the main weight 11 and the auxiliary weight 12 is removed. When removing the auxiliary weight 12 from the state of FIG. 2, first, the bolt 17 is loosened to remove the cover 16, and then the through bolt 18 is removed to allow the auxiliary weights 12 to 15 to be disassembled. Subsequently, a hanging tool (not shown) is attached to the threaded portion 15d of the fourth-stage auxiliary weight 15, and a hook of a crane (not shown) is hooked on the hanging tool to set the fourth-stage auxiliary weight 15 to the bottomed hole 11.
Remove from a. Thereafter, the third stage auxiliary weight 14, the second stage auxiliary weight 13, and the first stage auxiliary weight 12 are similarly taken out from the bottomed hole 11a in the same order. Finally, the cover 16 is attached again to complete the standard specification. In the standard specification, it is not always necessary to remove all the auxiliary weights 12 to 15, and some of the auxiliary weights (for example, the first-stage auxiliary weight 12 and the second-stage auxiliary weight 13) are required depending on the required weight of the counterweight 10. May be left. At this time, the remaining auxiliary weights 12 and 13 are fixed to the main weight 11 by short through bolts.

(2) Dismantling specification In order to change from the standard specification to the dismantling specification corresponding to the dismantling work having a large excavation reaction force, the work attachment 5 is replaced with a dismantling attachment and the weight of the counterweight 10 is increased. For example, all the auxiliary weights 12 to 15 are attached to the main weight 11. Main weight 1
In order to attach the auxiliary weights 12 to 15 to the cover 2, first, loosen the bolts 17 and remove the cover 16, and then lift the first-stage auxiliary weights 12 using a crane to form the convex portions 12a and the concave portions 11b therebelow. The first-stage auxiliary weight 12 is set in the bottomed hole 11a while adjusting the height. Thereafter, similarly, the second-stage counterweight 13 is stacked on the first-stage counterweight 12, the third-stage counterweight 14 is further stacked thereon, and the fourth-stage counterweight 15 is further stacked thereon. Subsequently, the through holes 12c to 15
c through the bolt 18 and the tip of the bolt 18
And the auxiliary weights 12 to 15 are fixed to the main weight 11. Finally, the cover 16 is attached again to complete the dismantling specification.

As described above, according to the present embodiment, the bottomed hole 11 for attaching the auxiliary weight is provided inside the main weight 11.
Since a is provided, the weight of the counterweight 10 can be changed according to the specifications of the working machine without changing the outer shape of the counterweight 10, that is, without shifting the counterweight 10 to the rear of the vehicle. Thereby, the turning radius of the work machine is not increased, and the work machine can be adapted to work on a narrow land. Further, by storing the auxiliary weights 12 to 15 in the bottomed hole 11a, the appearance around the counterweight 10 is improved. Further, when changing the specifications of the working machine, only the auxiliary weights 12 to 15 need to be attached and detached while the main weight 11 is fixed to the revolving frame 4, so that the work for changing the specifications becomes easy. Furthermore, since the cover 16 is attached to the upper surface of the main weight 11 so as to close the bottomed hole 11a, when the user rides on the upper surface of the counterweight 10 for maintenance of the fuselage or the like, the foot is accidentally slipped into the bottomed hole 11a. In addition, since the ground height of the counterweight 10 is regulated, the rear view from the driver's seat does not deteriorate.

In the above embodiment, the bottomed hole 11a
Has a box shape and the auxiliary weights 12 to 15 have a thick plate shape. However, the bottomed hole 11a and the auxiliary weights 12 to 15 may have other shapes. In addition, auxiliary weights 12-1
Although 5 is constituted by a segment member, it may be constituted by an integral member. Further, the counterweight in the above embodiment can be applied not only to a hydraulic excavator but also to a crane.

In the correspondence between the above embodiment and the claims, the bottomed hole 11a defines a recessed space, and the auxiliary weights 12-1
5, each of which is a segment member,
The concave portions 12b to 15b and the convex portions 12a to 15a formed on the upper and lower surfaces of the component 15 constitute the concave and convex members, respectively.

[0016]

As described above in detail, according to the present invention, the auxiliary weight is removably stored in the recess formed in the vehicle vertical direction from the upper surface of the main weight. Without changing the outer shape
In other words, without shifting the counterweight to the rear of the vehicle,
The weight can be easily changed according to the specifications of the working machine, and the appearance around the counterweight is improved.

According to the second aspect of the invention, since the auxiliary weight is constituted by a plurality of segment members, the weight of the counterweight can be finely changed, and the counterweight can be adapted to various specifications. Can be done. Further, according to the third aspect of the present invention, since the positioning uneven members are provided on the upper and lower lamination surfaces of the segment members, the lamination can be performed while positioning the segment members, and the stability at the time of lamination increases. . Furthermore, according to the invention of claim 4, since the cover for covering the recessed space is mounted on the upper surface of the main weight, the foot may be erroneously inserted into the recessed space when riding on the upper surface of the counterweight for maintenance of the aircraft. Don't slip. According to the fifth aspect of the present invention, since the recessed space is formed so that all of the auxiliary weights are completely stored, the auxiliary weights do not protrude upward and the rear view from the driver's cab does not deteriorate. Absent.

[Brief description of the drawings]

FIG. 1 is a plan view of a counterweight according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view (a sectional view taken along line II-II of FIG. 1) of the counterweight according to the embodiment of the present invention.

FIG. 3 is a perspective view of an auxiliary weight constituting the counterweight according to the embodiment of the present invention.

FIG. 4 is a side view of the hydraulic excavator to which the counterweight according to the embodiment of the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Undercarriage 4 Revolving frame 5 Work attachment 10 Counterweight 11 Main weight 11a Hole with bottom 12 First stage auxiliary weight 13 Second stage auxiliary weight 14 Third stage auxiliary weight 15 Fourth stage auxiliary weight 16 Cover 12a to 15a Convex portions 11b to 15b Concave portions

Claims (6)

[Claims] 1. A main weight attached to a rear end portion of a vehicle frame, and an auxiliary weight for increasing and decreasing weight, which is removably stored in a recess formed in a vehicle vertical direction from an upper surface of the main weight. A counterweight characterized by the following. 2. The counterweight according to claim 1, wherein the auxiliary weight includes a plurality of segment members that are vertically stacked. 3. The counterweight according to claim 2, wherein concave and convex members for positioning with another segment member are respectively provided on upper and lower stacked surfaces of the segment member. 4. A cover for covering the recessed space is mounted on an upper surface of the main weight.
The counterweight according to any one of the above. 5. The counterweight according to claim 1, wherein the recessed space is formed so as to completely store all of the auxiliary weights in the space. 6. A running body, a turning frame rotatably provided on the running body, a working device attached to a front end portion of the turning frame on a vehicle, and a reaction force generated by the working device. A construction machine comprising: a counterweight attached to a rear end of a vehicle of the turning frame; wherein the counterweight is formed in a vehicle vertical direction from an upper surface of the main weight attached to the turning frame; A construction machine equipped with a counterweight, comprising: an auxiliary weight for weight increase / removal, which is removably stored in the recessed space.