JP2938373B2 - Hydraulic piping in excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic excavator for digging a ditch, and more particularly to a hydraulic pipe for a hydraulic excavator for a ditch capable of offsetting a bucket arm from side to side.

[0002]

2. Description of the Related Art In a conventional hydraulic excavator for excavating a gutter, a bucket arm is pivotally connected to a leading end of a main boom via a horizontal bending boom, and a hydraulic pipe extending from the horizontal bending boom to a bucket cylinder is exposed to the outside. . In particular, since the hydraulic pipe is pulled or pressed in the longitudinal direction by the offset operation, the hydraulic pipe is provided with a margin so as to have a margin.

[0003] Accordingly, the hydraulic piping exposed to the outside is conspicuous and the appearance is impaired, and the hydraulic piping may be damaged due to contact with an external obstacle during the work. On the other hand, construction machines that protect hydraulic piping have been proposed. For example, in the offset type excavator described in Japanese Utility Model Laid-Open Publication No. 5-38045, a hydraulic pipe is inserted through a pipe material provided inside a lateral bending boom. I try not to have much room.

[0004]

In the hydraulic pipe of the offset type excavator described in the above-mentioned publication, the work of inserting the hydraulic pipe leading to the bucket cylinder into the pipe material in the laterally bent boom during assembly is complicated. Maintenance is not good.

[0005] In view of the above, technical problems to be solved arise in order to protect the hydraulic piping in the excavator for excavating a gutter and to improve the assemblability and maintainability. The present invention solves this problem. The purpose is to:

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object, and comprises a main boom, a horizontal folding boom pivotally attached to a tip of the main boom so as to be horizontally rotatable, and In a gutter excavator equipped with a bucket arm and the like pivotally attached to the tip of a laterally folding boom via an offset arm so as to be vertically rotatable, a bracket is fixedly mounted on the side surface of the laterally folding boom, An object of the present invention is to provide a hydraulic pipe for a gutter excavator having a holding section for a hydraulic pipe slidably mounted back and forth and arranged in parallel with a side surface of the side-folding boom.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an attachment part of a hydraulic excavator for digging a side groove. Further, a bucket arm 14 is pivotally attached to the tip of the lateral folding boom 12 via an offset arm 13 so as to be vertically rotatable, and a bucket 15 is attached to the tip of the bucket arm 14.

[0008] Hydraulic pipes 16, 16 ... extending from the side of the main boom 11 to the side of the side-bending boom 12 are provided to each cylinder, and pressurized oil is supplied to an arm cylinder 17, a bucket cylinder 18, and the like. Supplying. still,
A side cover 19 is attached to the side surface of the lateral bending boom 12 to cover the hydraulic pipes 16, 16,.

As shown in FIGS. 2 and 3, brackets 20, 20,...
A slide shoe 21 is mounted on the bracket 20, and a slide rail 22 is slidably fitted. The hydraulic pipes 16 are fixed to the surface of the slide rail 22 by a hose clamp 23 in an orderly manner, and constitute a holding portion 24. The hydraulic pipes 16 are arranged in parallel with the side surfaces of the laterally bent boom 12.

When the hydraulic pipes 16, 16,... Are pulled or pressed in the front-back direction following the offset operation, the hydraulic pipes 16 together with the holding portion 24 move the side of the laterally bent boom 12 back and forth. Slide.

[0011] For example, as shown by the solid line in FIG.
6 is pulled backward, and the holding portion 24 slides in the direction of arrow A. On the other hand, as shown by a two-dot chain line in the figure, when the side-bending boom 12 rotates to the right side of the fuselage, the hydraulic pipe 16 is pressed forward, and the holding portion 24 slides in the direction of arrow B.

At this time, the hydraulic piping 16 is
In contrast to the case 2, the parallel movement is performed integrally with the holding portion 24, and the length change due to the offset operation hardly occurs, so that the length of the hydraulic pipe 16 does not need to have a margin.

Since the hydraulic pipes 16, 16 are fixed in an orderly manner, there is no possibility that they will interfere with each other and the workability during assembly is good. Further, as shown in FIG. 1, if the hydraulic pipe 16 is covered with the side cover 19,
6 does not stand out and the aesthetic appearance is improved.

The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

[0015]

As described above, according to the present invention, the hydraulic piping from the side-to-side boom to the bucket cylinder slides back and forth in parallel with the side-to-side boom during the offset operation. And the hydraulic piping can be shortened, and the arrangement of the hydraulic piping is improved to improve the appearance. Therefore, there is no possibility that the hydraulic piping comes into contact with an external obstacle.

Further, since the respective hydraulic pipes are neatly fixed to the holding portion, the invention has various effects such as easy assembling work and good maintenance.

[Brief description of the drawings]

FIG. 1 is a side view showing an attachment portion of a hydraulic excavator having a side ditch, when a side cover is attached.

FIG. 2 is a side view showing an attachment portion of the side excavation hydraulic excavator when a side cover is detached.

FIG. 3 is a view taken on line XX of FIG. 1;

FIG. 4 is a plan view showing a state of the hydraulic piping when the horizontal folding boom performs an offset operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Main boom 12 Side bending boom 13 Offset arm 14 Bucket arm 16 Hydraulic piping 20 Bracket 21 Slide shoe 22 Slide rail 23 Hose clamp 24 Holding part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02F 9/00 E02F 9/14

Claims (1)

(57) [Claims] 1. A main boom, a laterally-bending boom pivotally attached to a tip of the main boom so as to be horizontally rotatable, and a bucket pivotally attached to a distal end of the horizontally-boom boom via an offset arm so as to be vertically pivotable. In a side ditch excavator equipped with an arm or the like, a bracket is fixedly mounted on a side surface of the side-bending boom, and a holding portion of a hydraulic pipe is slidably mounted on the bracket so as to be slidable back and forth. Hydraulic piping in a gutter excavator, which is disposed parallel to a side surface.