JPH06287980A - Working machine - Google Patents

Abstract

PURPOSE:To prevent a flexible hose from being broken by the contact with an obstruction around it during work by setting all flexible hoses provided in piping parts of a plurality of feed and discharge pipings within the visual field from a driver's cage. CONSTITUTION:A flexible hose 26 constituting each piping part 25 of feed and discharge pipings 22, 23 for feeding and discharging pressure oil to and from a bucket cylinder 12 is arranged on the side surfaces situated on a driver's cage 5 side of respective side surfaces of a boom 7 and an arm 8. Thus, each flexible hose 26 can be confirmed from the driver's cage 5, and the breakage of each flexible hose 26 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine such as a hydraulic excavator, and more particularly to a work machine having an improved mounting structure for mounting a pressure oil supply / discharge pipe to a work device.

[0002]

2. Description of the Related Art FIGS. 3 and 4 show a hydraulic excavator as an example of a conventional working machine.

In the figure, 1 is a lower traveling body, 2 is an upper revolving body 2 rotatably provided on the lower traveling body 1, and the upper revolving body 2 constitutes a working machine body together with the lower traveling body 1. The upper swing body 2 is provided with a machine room 3 in which an engine, a radiator, a hydraulic pump and the like (all not shown) are housed, and a counterweight 4.

As shown in FIG. 4, reference numeral 5 denotes a driver's cab provided on the left side of the front part of the upper swing body 2, and various operating levers, pedals, a driver's seat and the like (all are not shown in the drawing). No.) is provided so that the operator can operate the operation lever or the like to perform traveling, turning, drive control of the working device 6 described later, and the like.

Reference numeral 6 denotes a working device which is provided at the center of the front part of the upper revolving structure 2 so as to be able to move up and down. The working device 6 is roughly composed of a boom 7, an arm 8 and a bucket 9 as a working tool. The base end side of 7 is connected to the upper swing body 2, the base end side of the arm 8 is connected to the tip side of the boom 7, and the bucket 9 is connected to the tip side of the arm 8 by pin.

On the other hand, a boom cylinder 10 is provided between the upper swing body 2 and the boom 7, an arm cylinder 11 is provided between the boom 7 and the arm 8, and a bucket cylinder 12 is provided between the arm 8 and the bucket 9. Pressure oil from the hydraulic pump is supplied to and discharged from a rod-side oil chamber and a bottom-side oil chamber (neither shown) that are provided in each of the cylinders 10, 11 and 12, respectively. The working device 6 is operated by expanding and contracting the rods 10A, 11A, 12A of 10, 11, 12.

Reference numerals 13 and 13 denote first supply / discharge pipes for supplying / discharging pressure oil to / from the rod-side oil chamber and the bottom-side oil chamber of the arm cylinder 11, respectively. To extend along the longitudinal direction to a plurality of fixtures 14, 14, ...
It is positioned and attached by. Each of the supply / discharge pipes 13 has a proximal end connected to a hydraulic pump or a tank via a control valve (not shown) or the like, and a distal end connected to the arm cylinder 11.

Reference numerals 15 and 15 denote second supply / discharge pipes for supplying / discharging pressure oil to / from the rod-side oil chamber and the bottom-side oil chamber of the bucket cylinder 12, respectively. Is extended along the longitudinal direction and is positioned and attached by each fixture 14.

Reference numerals 16 and 16 denote pipe portions which are arranged between the boom 7 and the arm 8 and which form a part of the supply / discharge pipes 15. The pipe portions 16 are the second supply / discharge pipes. A flexible hose 17, which will be described later, and a plurality of connections for connecting the flexible hoses 17 to the distal ends of the supply / discharge pipes 15 and the bucket cylinder 12, respectively. It is composed of a member (not shown).

Numerals 17 and 17 denote flexible hoses provided between the boom 7 and the arm 8 and provided in the respective pipe portions 16, and the flexible hoses 17 are provided to rotate the arm 8 with respect to the boom 7. It has flexibility so that it can be bent freely with movement, and is formed with a required slack. One of the flexible hoses 17 is arranged on the left side of the side surfaces of the boom 7 and the arm 8, and the other is arranged on the right side of the side surfaces of the boom 7 and the arm 8. further,
The base end side of each flexible hose 17 is connected to the tip end side of each supply / discharge pipe 15, and the tip end side is connected to the bucket cylinder 12 via a connecting member.

In the hydraulic excavator constructed as above,
When excavating earth and sand, etc., the boom 7 and the arm 8 are raised and lowered by the boom cylinder 10 and the arm cylinder 11, and the bucket 9 is rotated by the bucket cylinder 12 to excavate earth and sand and the like. .

[0012]

By the way, in the above-mentioned prior art, the flexible hose 17 of each second supply / discharge pipe 15 is provided.
The other flexible hose 17 located on the right side is disposed on the side surface on the opposite side of the boom 7 and the arm 8 with respect to the operator's cab 5, so that the other flexible hose 17 is Arms 8 get in the way and do not enter the field of view from the cab 5. That is, the operator sitting on the driver's seat in the driver's cab 5 cannot see the flexible hose 17 on the right side from the driver's cab 5, and, for example, during excavation work in a narrow place such as an urban area or a forest area. In addition, there is a problem in that the flexible hose 17 on the other side is collided with or scratched by an obstacle such as a surrounding structure or a tree, and the work device 6 is damaged.

Further, even if the other flexible hose 17 is damaged during the work, the flexible hose 17 cannot be seen by the operator in the operator's cab 5, so the work is continued without noticing the damage. There is a problem in that there is a risk of causing a serious accident due to the damage.

On the other hand, as another conventional technique, each supply / discharge pipe 1
There is also known a working machine in which the flexible hose 5 and the like 5 and the like are provided inside the boom 7 and the arm 8 so as to prevent accidents such as damage to the piping. However, in this case, the boom 7 and the arm 8 must be provided with holes through which the flexible hoses 17 and the like are inserted, so that not only the strength of the boom 7 and the arm 8 is lowered, but also maintenance and inspection are required. However, there is a problem that it becomes complicated and takes extra time.

The present invention has been made in view of the above-mentioned problems of the prior art, and makes it possible to check all the flexible hoses provided in the pipe portion of the supply / discharge pipes from the operator's cab, and each flexible hose during work. An object of the present invention is to provide a working machine capable of preventing damage to the work.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a working machine main body having a driver's cab, a working machine main body which is provided so as to be able to move up and down, and each is operated by a hydraulic cylinder. From a working device including a boom, an arm, and a work tool, and a plurality of supply / discharge pipes extending in the length direction of the working device to supply and discharge hydraulic pressure to and from each hydraulic cylinder of the working device. In the working machine, a plurality of pipes provided between the boom and the arm among the supply and discharge pipes are formed with a necessary slack so as to allow the arm to rotate with respect to the boom. A side surface of each of the side surfaces of the boom and the arm that is on the driver's cab side so that each of the flexible hoses is within the field of view from the operator's cab. I decided to place it in It adopts a configuration comprising a said.

[0017]

With the above structure, the flexible hoses provided in the pipe portions of the supply and discharge pipes can be checked from the operator's cab, and the flexible hoses are monitored so as not to come into contact with surrounding obstacles during work. You can work while doing it.

[0018]

Embodiments of the present invention will be described below with reference to FIGS. In the embodiments, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 21 indicates a bucket cylinder provided between the arm 8 and the bucket 9 according to the present embodiment,
The bucket cylinder 21 is formed in substantially the same manner as the bucket cylinder 12 of the prior art, and a rod-side oil chamber and a bottom-side oil chamber (neither is shown) are defined therein, and pressure oil is provided in each of the oil chambers. Although the bucket 9 is rotated with respect to the arm 8 by expanding and contracting the rod 21A by supplying and discharging, the flexible hose 26 described later to which pressure oil is supplied and discharged is Are connected to the left side of each of them via connecting members.

Reference numerals 22 and 23 denote second supply / discharge pipes for supplying / discharging pressure oil to / from the rod-side oil chamber and the bottom-side oil chamber of the bucket cylinder 21, respectively. Similar to the second supply / discharge pipe 15, it is provided along the longitudinal direction on the upper surface side of the boom 7, and is positioned and attached by the fixtures 24, 24, ....

Here, as shown in FIG. 2, one supply / discharge pipe 22 is located on the left side of the upper surface of the boom 7, and is provided along the extending direction from the base end side of the boom 7 to the tip end side.
The other supply / discharge pipe 23 is located on the right side of the upper surface of the boom 7 at the base end side of the boom 7, and at the middle portion in the longitudinal direction of the boom 7, bends gently toward the left at a bent portion 23A, and then the tip end. It is provided along the extension direction of the boom 7 so as to be located on the same left side as the one supply / discharge pipe 22 on the side.

Reference numerals 25 and 25 denote pipe portions which are disposed between the boom 7 and the arm 8 and which form a part of the supply / discharge pipes 22 and 23. The pipe portions 25 are each the second supply / discharge pipes. Piping 22,
23 for connecting the respective tip ends of 23 and the bucket cylinder 21, and the flexible hoses 26, 26 described later, and the respective flexible hose 26 for the respective tip ends of the supply / discharge pipes 22, 23 and the bucket cylinder 21. It is composed of a connecting member (not shown) for connecting.

Numerals 26, 26 are located between the boom 7 and the arm 8 and indicate flexible hoses provided in the respective pipe portions 25, and the respective flexible hoses 26 are the boom 7 and the arm 8.
It is located on the left side, which is the cab 5 side, of each side surface, and is provided with a required slack so as to allow the arm 8 to rotate with respect to the boom 7. Further, the base end side of each flexible hose 26 is connected to the supply / discharge pipes 22 and 23, and the tip end side thereof is connected to the bucket cylinder 21 via connecting members (not shown).

The hydraulic excavator according to this embodiment has the above-mentioned structure, and its operation is almost the same as that of the prior art. When the excavation work is carried out by the boom cylinder 10 and the arm cylinder 11, the boom 7 is operated. Also, the arm 8 is rotated, and the bucket 9 is rotated by the bucket cylinder 21 to excavate earth and sand or the like.

However, in this embodiment, the second supply / discharge pipe 2
Since the flexible hoses 26 constituting the respective piping portions 25 of 2, 2 are arranged at positions where both can be confirmed from the operator cab 5 on the left side surfaces of the boom 7 and the arm 8,
Both of the flexible hoses 26 can be confirmed from the operator's cab 5, and excavation work or the like can be performed while constantly monitoring.

Thus, according to this embodiment, an operator sitting in the driver's seat of the driver's cab 5 can monitor both of the two flexible hoses 26 from the driver's seat, for example, in an urban area or a forest area. It is possible to prevent the flexible hoses 26 from hitting or being caught by obstacles such as surrounding structures and trees during excavation work in a narrow space. Further, the working device 6 and the like can be operated while monitoring each flexible hose 26 so as not to come into contact with obstacles and the like, and excavation work and the like can be performed with confidence.

Furthermore, when each flexible hose 26 is damaged due to an unexpected accident or the like during work, the damaged portion can be confirmed immediately, so that a secondary major accident that can occur by not continuing to notice the damage and continuing the work. Can be prevented.

On the other hand, the arrangement of the flexible hoses 26 in the respective pipe portions 25 of the second supply / discharge pipes 22 and 23 can be easily changed from the arrangement of the prior art, and the changing work can be easily performed.

Further, in comparison with the other prior art in which the flexible hoses 26 and the like are internally provided in the boom 7 and the arm 8, in the present embodiment, the boom 7 and the arm 8 are provided with through holes and the like. Since it is not necessary to pierce, the strength of the boom 7 and the arm 8 can be maintained as they are.

In the above embodiment, the cab 5 is arranged on the left side of the working device 6, so that the flexibility provided in each pipe portion 25 of the second supply / discharge pipes 22 and 23. Although the hose 26 is arranged on the left side of the side surface of the boom 7 and the arm 8, in the case of a hydraulic excavator in which the operator's cab 5 is located on the right side of the working device 6, each of the flexible hoses 26 is connected to the boom 7 and the boom 7. It is placed on the right side of the side of the arm 8 and
It should be in the field of view from.

Further, in the above-described embodiment, two second supply / discharge pipes 22 and 23 having the flexible hose 26 are provided in the pipe portion 25. However, in the present invention, the arm 8 and the bucket 9 have a plurality of cylinders. It may be used for a large hydraulic excavator attached, and even in this case, all the flexible hoses 26 provided in the pipe portion 25 of the second supply / discharge pipe are It may be arranged on the side surface located on the cab 5 side.

Further, in the above-mentioned embodiment, the hydraulic excavator was taken as an example of the working machine, but the present invention can be applied to a backhoe boat having a working device such as a boom and an arm.

[0033]

As described above in detail, according to the present invention,
Of the side surfaces of the boom and the arm, the side surface on the driver's cab side so that all of the plurality of flexible hoses provided in the piping portion of each supply / discharge pipe are within the view from the operator's cab. Since all of the flexible hoses can be confirmed from the driver's cab, it is possible to prevent the flexible hoses from contacting surrounding obstacles during work such as excavation work. Therefore, it is possible to prevent damage to the pipe portion of each supply / discharge pipe, and to significantly improve safety.

[Brief description of drawings]

FIG. 1 is a perspective view showing a working apparatus for a hydraulic excavator according to an embodiment.

FIG. 2 is an overall view of the hydraulic excavator according to the embodiment when viewed from above.

FIG. 3 is an overall perspective view showing a hydraulic excavator according to a conventional technique.

FIG. 4 is an overall view of a conventional hydraulic excavator as viewed from above.

[Explanation of symbols]

 1 Lower traveling body 2 Upper revolving structure 5 Driver's cab 6 Working device 7 Boom 8 Arm 9 Bucket 22,23 Supply / discharge pipe 25 Pipe portion 26 Flexible hose

Claims (1)

[Claims] 1. A working machine main body provided with a driver's cab, a working machine provided with a boom, an arm, and a working tool which are provided on the working machine main body so as to be able to move up and down, and the working machine. In order to supply and discharge hydraulic pressure to and from the hydraulic cylinders, a working machine comprising a plurality of supply and discharge pipes extending in the length direction of the working device, the boom among the supply and discharge pipes, The piping section provided between the flexible hose and the arm is composed of a plurality of flexible hoses formed with a necessary slack so as to allow the arm to rotate with respect to the boom. A working machine characterized in that each of the flexible hoses is arranged on one of the side surfaces of the boom and the arm that is on the cab side so that the flexible hose is within the field of view from the cab.