JPH0953257A - Hydraulic piping in gutter excavating hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a hydraulic piping in a gutter excavating hydraulic shovel while improving assembly properties and maintenance properties. SOLUTION: A bucket arm 19 is attached pivotally at the front end of a laterally folding boom 13 through an offset arm 14. A hydraulic piping 26 from the laterally folding boom 13 to a bucket cylinder 24 is disposed on the outside of an arm bracket 21 in the width of the bucket arm 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gutter hydraulic excavator, and more particularly to hydraulic piping in a gutter hydraulic excavator capable of offsetting a bucket arm to the left and right.

[0002]

2. Description of the Related Art In a conventional gutter hydraulic excavator, a bucket arm is pivotally attached to the tip of a main boom via a horizontal bending boom, and a hydraulic pipe from the horizontal bending boom to a bucket cylinder is exposed to the outside. . Therefore, the exposed hydraulic piping is conspicuous and looks bad,
The hydraulic piping may be damaged due to contact with an external obstacle during the work.

On the other hand, a construction machine in which hydraulic piping is protected has also been proposed. For example, in the hydraulic excavator described in Japanese Utility Model Laid-Open No. 4-1248, the hydraulic pipe that reaches the bucket cylinder is bent by inserting the hydraulic pipe inside the arm bracket for connecting the arm cylinder and below the pin for connecting the arm cylinder. The part is covered.

[0004]

In the hydraulic pipe of the hydraulic excavator described in the above publication, the work of inserting the hydraulic pipe leading to the bucket cylinder into the gap of the arm bracket during assembly is complicated, and the assemblability and maintainability are not good. Absent.

Therefore, there arises a technical problem to be solved in order to protect the hydraulic pipe in the gutter digging hydraulic excavator and to improve the assembling property and the maintainability. The present invention solves this problem. The purpose is to

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above object, and a laterally bent boom is pivotally attached to the distal end of a main boom so as to be horizontally rotatable. A bucket arm is rotatably pivoted up and down via an offset arm, a base end of a bucket cylinder is attached to the bucket arm, an arm bracket is provided in the vicinity of the pivot arm pivot part, and a tip end of the arm bracket is provided. In a ditch digging hydraulic excavator in which a connecting pin is provided and a tip of an arm cylinder attached to the offset arm is connected to a connecting pin of the arm bracket,
The present invention provides a hydraulic pipe for a gutter hydraulic excavator in which the hydraulic pipe from the laterally bent boom to the bucket cylinder is arranged outside the arm bracket and within the width of the bucket arm.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an attachment portion of a gutter digging hydraulic excavator, in which a base bracket 12 is projectingly provided on one end of the main boom 11 so that the main boom 1
The boom 1 is pivotally attached to the tip of the rotator 1 so as to be horizontally rotatable. In addition, the front portion of the offset arm 14 is horizontally pivotally attached to the tip of the lateral folding boom 13, and the top bracket 15 is attached to one side surface of the tip of the offset arm 14.
To project.

A side bracket 16 is projectingly provided at an intermediate portion of the lateral bending boom 13, an offset cylinder 17 is interposed between the base bracket 12 and the side bracket 16, and the base bracket 12 is also provided.
The link rod 18 is connected between the top bracket 15 and the top bracket 15.

Next, the bucket arm 19 is pivotally attached to the tip of the offset arm 14 so as to be vertically rotatable, and the bucket 20 is pivotally attached to the tip of the bucket arm 19 so as to be vertically rotatable. Further, an arm bracket 21 is provided in the vicinity of the pivotal attachment portion of the bucket arm 19, and the tip of the arm cylinder 22 mounted on the offset arm 14 is connected to the tip of the arm bracket 21 by a connecting pin 23. Further, a bucket cylinder 24 is attached to the bucket arm 19,
The tip of the bucket cylinder 24 is connected to the bucket 20.

Here, a hydraulic pipe 25 reaching each cylinder is arranged inside the horizontal folding boom 13 to supply pressure oil to the arm cylinder 22, the bucket cylinder 24 and the like. As shown in FIGS. 1 and 2, the hydraulic pipe 26 extending from the laterally bending boom 13 to the bucket cylinder 24 is
It is arranged on the left and right outside of the arm bracket 21 and within the width of the bucket arm 19, and when the bucket arm 19 rotates due to expansion and contraction of the arm cylinder 22,
The hydraulic pipe 26 is bent with a margin so as not to interfere with it.

Covers 27 are attached to the left and right side surfaces of the arm bracket 21 to cover the hydraulic pipe 26 and prevent the hydraulic pipe 26 from deviating to the side of the bucket arm 19. The cover 27 does not necessarily have to be attached, and the method is not particularly limited as long as it limits the lateral movement of the hydraulic pipe 26 and regulates it within the width of the bucket arm 19.

It should be understood that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modifications.

[0013]

As described above, according to the present invention, since the hydraulic pipe extending from the laterally bent boom to the bucket cylinder is stored within the width of the bucket arm, the arrangement of the hydraulic pipe is arranged and the appearance is improved. In addition, the hydraulic pipe does not deviate to the side of the bucket arm, and there is no risk of the hydraulic pipe coming into contact with an external obstacle.

Further, since the hydraulic pipe is arranged outside the arm bracket, the assembling work is easy and the maintainability is good.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a view taken along the line AA of FIG.

[Explanation of symbols]

 11 Main Boom 13 Sideways Boom 14 Offset Arm 19 Bucket Arm 21 Arm Bracket 22 Arm Cylinder 23 Connecting Pin 24 Bucket Cylinder 25, 26 Hydraulic Piping

Claims (1)

[Claims] 1. A horizontal folding boom is rotatably pivoted horizontally to the tip of a main boom, and a bucket arm is pivotally pivoted vertically to the tip of this horizontal folding boom via an offset arm. A base end of a bucket cylinder is attached to the arm, an arm bracket is provided in the vicinity of a pivot portion of the bucket arm, and a connecting pin is provided at a tip of the arm bracket, and a tip of the arm cylinder attached to the offset arm is connected to the arm bracket In a ditch digging hydraulic excavator connected to a pin, the hydraulic pipe extending from the laterally bending boom to the bucket cylinder is arranged outside the arm bracket and within the width of the bucket arm. Hydraulic piping in.