JPH08151192A - Counterweight structure for working machine - Google Patents

Abstract

PURPOSE: To satisfactorily hold the balance of a machine body at working, and prevent the machine body from exceeding the load limit of a vehicle at carrying by providing a space for housing a liquid in the inner part of a counterweight, and providing the injection port and discharge port of the liquid to the space. CONSTITUTION: Spaces for housing water are formed in two sections on both ends of a counterweight 3, and liquid injection ports 8 and liquid discharge ports 11 are provided on the upper parts and lower parts of these sections, respectively. At the working of a hydraulic shovel, a liquid is injected into and filled in the spaces of the counterweight 3 through the injection ports 8. When the working machine is transferred on a vehicle and carried, it is loaded on the vehicle after the liquid is discharged from the discharge ports 11. Thus, the balance of the machine body is held to ensure a high working stability, and the machine body is prevented from exceeding the load limit of the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counterweight structure for working machines such as hydraulic excavators and cranes.

[0002]

2. Description of the Related Art Work machines such as hydraulic excavators and crane trucks are equipped with counterweights for maintaining the balance of the machine body when an excavating force, a suspension load, etc. are applied. As the conventional counterweight, there are provided one that is made of a casting and has an integrated structure, one that is formed by assembling steel plates and packed with scrap iron, concrete, etc., and solidified.

[0003]

This type of working machine is carried by being carried in a vehicle, but at that time, the weight of the counterweight is required to be as light as possible due to the limitation of the loading weight of the vehicle. On the other hand, in order to expand the working capacity of the working machine, it is desirable that the weight of the counterweight be large.

[0004]

The present invention has been invented to solve the above-mentioned problems, and is characterized in that a space for containing a liquid is provided inside the counterweight and The purpose is to provide a liquid inlet and outlet for the space.

Another feature is that an additional counter weight different from the above counter weight is detachably attached to the machine body.

Still another feature is that a space for accommodating a liquid is provided inside the additional counterweight and a liquid inlet and a liquid outlet are provided in this space.

Still another feature is that the above-mentioned additional counterweight is divided into a plurality of pieces, and the divided additional counterweights are independently and detachably attached to the machine body.

Still another feature is that a space for accommodating the liquid is provided inside each of the divided additional count weights, and a liquid inlet and a liquid outlet into the space are provided.

[0009]

In the present invention, the liquid is filled from the inlet into the space of the counterweight during the work such as excavation work and hanging work. When the work machine is mounted on a vehicle and transported, the liquid in the space of the counterweight is discharged from the discharge port.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS. 1 to 3, FIG. 1 is a side view of a hydraulic excavator, FIG. 2 is a plan view, and FIG.
(A) is a view taken along the arrow A in FIG. 1, and FIG. 3 (B) is an enlarged sectional view of a B portion in FIG. 3 (A).

In FIGS. 1 and 2, 1 is an upper swing body of a hydraulic excavator, 2 is a front working machine attached to the front part of the upper swing body 1, and 3 is a counterweight attached to the rear part of the upper swing body 1. Reference numeral 5 is a traveling crawler.

Like the conventional counterweight, the two compartments 3C and 3D in the center of the counterweight 3 are constructed by filling solid bodies such as scrap iron and concrete in a box body made of cast iron or formed of steel plate. .

Further, as shown in FIG. 3, a space 31 for accommodating water or the like is provided inside the two compartments 3A and 3B at both ends.
A and 31B are formed, and a liquid inlet 8 is provided in the upper part of these compartments 3A and 3B, and a liquid outlet 11 is provided in the lower part.

An additional counterweight 7 is attached to the lower portion of the counterweight 3, and a space 71 for accommodating water or the like is formed inside this.

The space 71 is defined by partition walls 16 for suppressing sloshing of the liquid generated when the working machine swings, and a passage 18 for allowing the liquid to flow through each partition wall 16.
Has been drilled. A liquid inlet 10 is provided at the upper part of the additional counterweight 7, and a discharge port 9 is provided at the lower part.
Is provided.

As shown in FIG. 2, the additional counterweight 7 is disposed between the center of revolution 30 of the upper revolving structure 1 and the rear end radius R and the inner radius r of the counterweight 3 and the rear height of the crawler 5. If it is installed at a position higher than the height H, the additional counterweight 7 does not hinder the work of the work machine.

When the hydraulic excavator is in operation, however, the liquid is injected into the spaces 31A and 31B of the counterweight 3 and the space 71 of the additional counterweight 7 through the injection ports 8 and 10 to fill the space.

As a result, the counterweight 3 and the additional counterweight 7 have a sufficient weight to withstand the external force such as the excavating force applied from the front working machine 2 to the machine body, and thus the balance of the machine body is maintained, High work stability can be secured.

When the working machine is mounted on a vehicle and transported,
The liquid is discharged from the discharge ports 11 and 9 and then mounted on the vehicle. As a result, the weights of the counterweights 3 and 7 are reduced by the weight corresponding to the amount of discharged liquid, and the weight of the working machine is reduced.

In the above embodiment, the liquid can be supplied and discharged into the compartments 3A and 3B at both ends of the counterweight 3, but the liquid can be supplied and drained into the two central compartments 3C and 3D. And in addition, all the sections 3A, 3B, 3C,
It is also possible to allow the liquid to be supplied to and discharged from the 3D.

Further, as shown in FIG. 4, the additional counter weight 7 includes four additional counter weights 7A, 7B, 7C,
It can be divided into 7D, and a space 72, a liquid inlet 10 and a liquid outlet 9 can be provided in each.

Then, these additional counter weights 7A,
If 7B, 7C, and 7D can be attached to the counterweight 3 or the frame 6 of the upper swing body 1 using hooks and bolts, these can be easily attached and detached at the work site.

[0023]

According to the present invention, when the work machine is operated, the balance of the machine body is maintained well by performing the work in a state where the space of the counterweight is filled with the liquid, and high work stability is obtained. be able to.

On the other hand, when the working machine is mounted on a vehicle for transportation, the weight of the working machine as a whole exceeds the loading limit of the vehicle by discharging the liquid in the space of the counterweight to reduce the weight of the counterweight. Can be prevented.

If an additional counter weight separate from the counter weight is detachably attached to the machine body, the weight adjustment range of the counter weight can be further expanded and the weight adjustment can be easily performed on site.

If a space for accommodating a liquid is provided inside the additional counterweight and a liquid inlet and a discharge port for this space are provided, the additional counterweight is supplied and discharged into the space. The weight of can be adjusted easily.

Further, if the additional counterweight is divided into a plurality of parts and the divided additional counterweights are independently and detachably attached to the machine body, the weight adjustment of the additional counterweight becomes easy.

If a space for containing a liquid is provided inside each of the divided additional counterweights, and an inlet and a discharge port for the liquid to this space are provided, the weight of the additional counterweight can be easily adjusted. .

[Brief description of drawings]

FIG. 1 is a side view showing a counterweight structure of a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a plan view of the embodiment.

3A is an arrow view taken along the arrow A in FIG. 1, and FIG. 3B is an enlarged sectional view of a B portion in FIG.

FIG. 4 shows a second embodiment of the present invention, in which (A) and (B) are views corresponding to (A) and (B) of FIG. 3, respectively.

[Explanation of symbols]

 1 Upper revolving structure 3 Counterweight 5 Crawler 7 Additional counterweight 8 Injection port 9 Discharge port 31A, 31B Space

Claims (5)

[Claims] 1. In a working machine such as a hydraulic excavator or a crane equipped with a counterweight for maintaining a balance of a machine body, a space for accommodating a liquid is provided inside the counterweight, and a liquid injection port into this space is provided. And a counterweight structure for a working machine, which is provided with a discharge port. 2. The counterweight structure for a working machine according to claim 1, wherein an additional counterweight separate from the counterweight is detachably attached to the machine body. 3. The counter for a working machine according to claim 2, wherein a space for containing a liquid is provided inside the additional counterweight, and a liquid inlet and a liquid outlet into the space are provided. Weight structure. 4. The counterweight for a working machine according to claim 2, wherein the additional counterweight is divided into a plurality of pieces, and the divided additional counterweights are independently and detachably attached to the machine body. Construction. 5. The work according to claim 4, wherein a space for containing a liquid is provided inside each of the divided additional count weights, and a liquid inlet and a liquid outlet into the space are provided. Machine counterweight structure.