JP2981429B2 - Counterweight attachment / detachment device for construction machinery - 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 attaching / detaching apparatus for a construction machine, and more particularly to a counterweight attaching / detaching apparatus which does not use an auxiliary machine such as a crane.

[0002]

2. Description of the Related Art Construction machines such as hydraulic excavators and hydraulic cranes are equipped with counterweights for balancing work attachments. Since the weight of this counterweight is particularly large in large construction machines, it is necessary to remove the counterweight from the aircraft and transport it separately during transportation.
When attaching and detaching the counterweight, an auxiliary machine such as another crane had to be used.

In order to solve this problem, a construction machine equipped with a counterweight attaching / detaching device is known, and the present applicant has proposed a counterweight attaching / detaching device described in Japanese Utility Model Publication No. Hei 5-3568. The counterweight attachment / detachment device described in the publication has a simpler configuration than the conventional type,
In addition, since the mounting position of the counterweight is automatically determined by the hook and the inclined surface provided in the engaging recess, the mounting operation is easy. However, to connect the end of one wire rope to the arm cylinder mounting lug at the top of the boom,
When connecting the wire rope, the worker had to climb the top of the boom, and working at a high place was dangerous.

[0004] Therefore, there arises a technical problem to be solved in order to safely attach the wire rope when attaching and detaching the counterweight, and an object of the present invention is to solve this problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object. A boom which can be raised and lowered by a cylinder is mounted on a front portion of an airframe, and a work attachment is mounted on the boom. A mast is erected at the rear of the fuselage, and a sheave is pivotally attached to the end of the mast, and a hook is pivotally pivotally attached to the middle part of the mast. Provide a recess,
And in a counterweight attaching / detaching device of a construction machine in which a counterweight and the boom are detachably connected by a wire rope via a sheave, the wire rope is divided into two, an upper rope and a lower rope,
The upper end of the upper rope is always connected to the arm cylinder mounting lug of the boom, and the lower end of the upper rope is normally locked near the boom foot. The present invention provides a counterweight attaching / detaching device for a construction machine in which an upper end of a lower rope is connected and a lower end of a lower rope is connected to the counterweight.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a hydraulic excavator 10 as an example of a construction machine, in which an upper swing body 12 is mounted on a lower traveling body 11 so as to be able to swing. Upper revolving superstructure 1
The boom 13 is mounted on the front of the boom 2, and a work attachment including the arm 14 and the bucket 15 is mounted on the boom 13. The boom 13 is raised and lowered by the expansion and contraction of a boom cylinder 16, and the arm 14 and the bucket 15 are rotated by expansion and contraction of an arm cylinder 17 and a bucket cylinder 18, respectively.

On the other hand, a mast 19 is provided at the rear of the upper rotating body 12.
And a sheave 20 is pivotally attached to the tip of the
Hooks 21 are rotatably pivotally attached to the middle portions of the right and left positions, respectively. The hook 21 projects rearward by the operation of the cylinder 22, and engages with an engaging recess 25 provided on one side surface of the counterweight 23 when the counterweight 23 is mounted on the mounting plate 24, as described later. Is to make it easier.

When attaching and detaching the counterweight 23, the arm cylinder attachment lug 26 fixed on the upper surface of the boom 13 and the attachment lug 27 fixed on the upper surface of the counterweight 23 are connected to the wire rope 28. Connect
The boom 13 is raised and lowered and the counterweight 23 is raised and lowered. The wire rope 28 is divided into an upper rope 28a and a lower rope 28b, and the lower end of the upper rope 28a is normally locked by a clamper 29 near the boom foot 13a.

When the counterweight 23 is mounted, the clamper 29 is relaxed and the upper rope 28 is loosened.
The lower end of the lower rope 28a is separated from the boom foot 13a, and the upper end of the lower rope 28b is connected to the lower end of the upper rope 28a by a pin or the like. Then, the lower end of the lower rope 28 b is connected to the mounting lug 27 of the counterweight 23 while winding the lower rope 28 b around the sheave 20.

At this time, if the boom 13 is erected, the distance between the arm cylinder mounting lug 26 and the counterweight 23 is reduced, and the lower end of the lower rope 28b is easily connected to the mounting lug 27 of the counterweight 23. Further, after connecting the lower end of the lower rope 28b to the mounting lug 27 of the counterweight 23 first, the upper end of the lower rope 28b may be connected to the lower end of the upper rope 28a.

Thus, as shown in FIG.
And the counterweight 23 are connected by a wire rope 28. When the boom 13 is turned forward in this state, as shown in FIG. 3, the counterweight 23 is pulled up by the wire rope 28, and the engagement recess 25
The counterweight 23 is raised until the height reaches 1. Then, the cylinder 22 is operated to cause the hook 21 to project rearward.

Here, the engaging recess 25 has an inclined surface 31 which expands from the opening 30 of the counterweight 23 toward the inside upward, and the inclined surface 31 is engaged with the hook 21. Is formed. Accordingly, when the boom 13 is raised from the state shown in FIG. 3 and the counterweight 23 is slightly lowered, the inclined surface 31 provided in the engagement recess 25 engages with the hook 21 as shown in FIG. ,
The counterweight 23 is attached to the mounting plate 24 along the inclined surface 31.
Descend so that it is drawn to the side.

When the counter weight 23 is lowered to a predetermined position, the counter weight 23 is
Is fixed to the mounting plate 24. Then, the boom 13 is further raised and the wire rope 28 is relaxed, and the upper rope 28
a, the lower end of the lower rope 28b is detached from the mounting lug 27 of the counterweight 23, the lower rope 28b is detached, and the lower end of the upper rope 28a is again locked to the clamper 29 of the boom foot 13a. If this is the case, the excavator 10 will be in the working posture.

On the other hand, when the counterweight 23 is to be detached, first, the clamper 29 is relaxed so that the lower end of the upper rope 28a is separated from the boom foot 13a, and the lower end of the upper rope 28a and the counterweight are disengaged in the same manner as the mounting operation described above. 23 are connected to the mounting lug 27 by a lower rope 28b.

Next, if the fixing bolt 32 is removed, the boom 13 is turned over, and the counterweight 23 is slightly lifted, the counterweight 23 is turned on the inclined surface 31 contrary to the above.
Along with the mounting plate 24. Subsequently, the cylinder 22 is operated to store the hook 21 beside the mast 19, and the boom 13 is raised and lowered until the counterweight 23 lands.

After the boom 13 is further raised and the wire rope 28 is relaxed and the lower rope 28b is removed, the lower end of the upper rope 28a is locked again to the clamper 29 of the boom foot 13a.

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.

[0018]

As described above, according to the present invention, the wire rope connecting the counterweight and the boom is divided into two parts, and the lower end of the upper rope is placed at a low position such as near the boom foot when the counterweight is attached or detached. And the upper end of the lower rope can be connected. Therefore,
Eliminating work at high places when connecting the wire rope improves safety.

[Brief description of the drawings]

 The figure shows an embodiment of the present invention.

FIG. 1 is a side view of a hydraulic excavator when a counterweight is not mounted.

FIG. 2 is a view showing a state where the counterweight lands when the counterweight is attached and detached.

FIG. 3 is a diagram showing a state in which a counter weight is being lifted when the counter weight is attached or detached.

FIG. 4 is an enlarged view of a state where the counterweight is mounted on the machine body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Hydraulic excavator 12 Upper revolving body 13 Boom 16 Boom cylinder 19 Mast 20 Sheave 21 Hook 23 Counter weight 25 Engagement concave part 26 Arm cylinder mounting lug 27 Mounting lug 28 Wire rope 28a Upper rope 28b Lower rope 29 Clamper 30 Opening

Claims (1)

(57) [Claims] 1. A boom which can be raised and lowered by a cylinder is mounted on a front part of a fuselage, a work attachment is attached to the boom, a mast is erected on a rear part of the fuselage, and a sheave is pivotally mounted on a tip of the mast. A hook is rotatably attached to the middle part of the counterweight, and an engagement concave part whose inside is larger than the opening is provided on one side surface of the counterweight, and the counterweight and the boom can be attached and detached by a wire rope via a sheave. In the counterweight attaching / detaching device of the construction machine connected to the above, the wire rope is divided into two ropes, an upper rope and a lower rope. Lock the lower end of the upper rope near the boom foot. A counterweight attachment / detachment device for a construction machine, characterized in that the upper end of the lower rope is connected to the lower end of the upper rope, and the lower end of the lower rope is connected to the counterweight.