JP2000096610A - Excavating work machine and boom structure for the work machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a hose group for a hydraulic cylinder from expanding toward a swivel while following the swing of a boom. SOLUTION: A swing bracket 9 is attached to a boom structure 1.
3 to form a space 22 surrounded by the root portion 19 in front of the pivot portion 20 while being sandwiched by the root portion 19 of the hydraulic fluid passing through the swing bracket 9. Hose group 23 passes upward through the space 22 from below.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator, such as a backhoe, and a boom structure of the excavator.

[0002]

2. Description of the Related Art A conventional backhoe is disclosed in Japanese Patent Application Laid-Open No. 9-60039. In this backhoe, a swivel body is provided on a traveling device so as to be rotatable about a vertical axis, and a boom pivotally attached to the swivel body via a lateral pivot, and a boom of the boom. An excavator is provided which has an arm pivotally attached to a tip thereof and a bucket provided at a tip of the arm so as to be free to squeeze and dump.

A control valve unit for supplying hydraulic oil to various actuators for driving the above-mentioned excavator and crawler traveling device is mounted inside the turning body. Since the boom of the excavator swings up and down around the pivot, a flexible hydraulic hose is used as a hydraulic pipe for supplying hydraulic oil to each hydraulic cylinder provided on the boom. Is installed at the pivot point of the boom with a sufficient length.

[0004]

In the above-mentioned conventional backhoe, when a flexible hydraulic hose is piped with a sufficient length at a pivot portion of the boom, the hydraulic hose is moved from the pivot of the boom. (See Japanese Unexamined Patent Publication No. 9-6003).
No. 9 (see FIG. 6).

[0005] Therefore, in the conventional backhoe, when the boom is at its highest position, the hydraulic hose greatly expands rearward, so that the living space on the turning machine body is restricted by the amount of the expanded hydraulic hose, and the expanded hydraulic pressure is increased. The hose hindered operability. In a conventional boom (boom structure), a boom base is extended bifurcated from the boom main body, and a collar or a bush is interposed therebetween. The boom was pivotably attached to the boom by inserting a horizontal pivot.

[0006] For this reason, it is necessary to machine the root portion of the long boom structure, and the machining is troublesome and the machining accuracy is deteriorated. SUMMARY OF THE INVENTION In view of such circumstances, a first object of the present invention is to prevent a hydraulic hose from expanding backward at the time of a maximum rise of a boom, and to effectively secure a living space on a turning body. I do.

It is a second object of the present invention to provide a boom structure capable of machining the swing bracket side.

[0008]

According to the present invention, a swing bracket 9 is pivotally mounted on a swivel base 4 so as to be rotatable about a vertical axis, and a root 19 of a boom structure 13 is attached to the swing bracket 9 in a lateral direction. In order to achieve the above-mentioned first object, the following technical measures are taken in an excavating work machine provided to be vertically movable via a pivot 20.

That is, in the present invention, the swing bracket 9 is sandwiched between the base portions 19 of the boom structure 13 and is pivotally connected to the horizontal pivot 20 so as to be surrounded by the root 19 in front of the pivot 20. A hose group 23 for the hydraulic oil that has formed the space 22 and has passed through the swing bracket 9 is
It is characterized by passing through the space 22 upward from below (claim 1).

Further, according to the present invention, the root 19 of the boom structure 13 is pivotally mounted on a horizontal pivot 20 while being sandwiched by the swing bracket 9, and is surrounded by the root 19 in front of the pivot 20. A space 22 is formed, and a hose group 23 for hydraulic oil that has passed through the swing bracket 9 passes upward through the space 22 from the bottom (claim 2).

According to the excavator of the first or second aspect, when the boom structure 13 rotates upward around the pivot 20, the bulging of the hose group 23 that has passed through the space 22 from below upward. Is prevented by the pivot 20.
Further, in claim 1 or 2, it is preferable that a relay portion 24 of a hose group 23 that has passed through the space 22 from the bottom upward is provided on the upper surface of the boom structure 13 (claim 3).

Further, the boom base portion 19 of the boom structure 13 used in the excavator according to the first to third aspects is formed by a forged product in which two members 19B and 19C having a symmetric shape are welded at their overlapping portions 19D. (Chart 4). Further, the boom root part 1 according to claim 4.
Reference numeral 9 denotes a fitting portion 19A for fitting into the boom body 13D.
The spigot fitting portion 19A is inserted into the opening 13F of the boom body 13D and welded 21 (claim 5).

According to the boom structure 13 according to the fourth or fifth aspect, the swing bracket 9 side through which the pivot 20 is inserted can be machined, and the boom structure 13 is machined as in the prior art. Workability is improved compared to
Processing accuracy is also improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIGS. 5A and 5B show the entire configuration of the excavator 1 (backhoe). Is mounted so as to be able to make a full turn (360 ° rotation) around the axis (XX) of the.

An engine 5 and the like are mounted on the swivel 4. The engine 5 is surrounded by a hood 6, and a driver's seat 7 is provided on the hood 6. A boom attachment bracket 8 is fixed to the front side of the swivel base 4, and a swing bracket 9 is pivotally attached to the bracket 8 via a vertical axis 10. It is rotatable.

The swing bracket 9 includes an excavator 12
The drilling rig 12 is provided with a boom structure 1
3. It is mainly composed of an arm 15 and the like having a bucket 14 attached to the tip of the structure 13 so as to be undulating,
Excavation work such as digging is enabled by the expansion and contraction operation of hydraulic cylinders such as the boom cylinder 16, the arm cylinder 17, and the bucket cylinder 18.

Referring to FIGS. 1A and 1B, FIGS. 2A and 2B and FIG. 3, details of the boom structure 13 are shown. The boom structure 13 has a box-shaped cross section as shown in FIG. 3, and has upper and lower left and right corners chamfered 13A. The welded joint 13C is formed in the longitudinal direction of the boom.

The root 19 of the boom structure 13 is composed of two symmetrical members 19B and 19C having a fitting portion 19A for fitting into the root opening 13F of the boom body 13D. In the two members 19B,
19C are overlapped with each other, and the overlapped portion 19D is welded and joined.
B and 19C are stretched in a bifurcated shape.
The insertion boss portions 19E and 19F of the lateral pivot 20 are formed to face each other on the left and right.

That is, the fitting portion 19A is spigot-fitted into the opening portion 13F, and the two-step welding process is performed as shown in FIG.
1 and the boss 19 of the root 19
Boss 9A of swing bracket 9 by E and 19F
The pivot shaft 20 is inserted into each boss portion with the boom structure 13 being rotatably mounted on the swing bracket 9, and a space 22 surrounded by a root portion 19 is formed in front of the pivot shaft 20. ing.

Here, the boss 9A of the swing bracket 9 through which the pivot 20 is inserted can be machined,
The boss portions 19E and 19F of the root portion 19 can be machined as small articles, and a hole 19G for a retaining pin of the pivot 20 is formed in one of the boss portions 19E and 19F. A hose group 23 passing through the swing bracket 9 is inserted into the space 22 upward from below, and the hose group 23 passing through the space 22 is provided on the upper surface of the boom body 13D via a curved portion. Hydraulic cylinders such as the arm cylinder 17 and the bucket cylinder 18 and a service port (not shown) are connected via a relay portion 24 so that hydraulic oil can be supplied and discharged.

Each of the hydraulic hose groups 23 has flexibility, and the relay section 24 is constituted by a male / female coupler or the like, and follows the vertical swing and the horizontal swing of the boom 13. And when the boom 13 moves up with the pivot 20 as a fulcrum,
Swelling of the hose group 23 passing through the space 22 to the rear (the swivel table side) is prevented by the pivot 20, substantially the boss 9 A, and the boom 13 swings right and left about the vertical axis 10. At this time, the hose group 23 is prevented from swinging by the two members 19B and 19C of the root portion 19.

The swing bracket 9 and the base 19 can be manufactured by casting or forging, and the base 19 is made of a forged product with two symmetrical members 19B and 19C, so that parts can be shared. And the machinability is improved. FIG. 4 shows an embodiment according to claim 2, wherein two members 19B and 19 are symmetrical.
As described in C, welding 21 at the spigot fitting portion 19A
By doing so, it is joined to the boom body 13A, and the root portion 19 is sandwiched by the swing bracket 9.

Therefore, the insertion boss portions 19E, 1 of the pivot 20
9F is formed integrally long in the lateral direction, and the boss portions 19E,
The butt portion of 19F is also located on the same line as the overlap portion 19D and is welded and joined 19H.
The outer peripheral surfaces of E and 19F are tapered. In addition,
Boom structure 13 welded to base 19 shown in FIG.
Has a space 22 and is not shown in FIG. 4, but a hose group 23 is inserted through the space 22 from below to above as shown in FIG.

In the embodiment shown in FIGS. 4 and 6, portions common to those shown with reference to FIGS. 1 to 3 are denoted by common reference numerals. The hydraulic hose 23A for the boom cylinder 16 is mounted on a side surface of the swing bracket 9 via a holder 23B as shown in FIG.

[0025]

As described in detail above, according to the present invention,
Even if the boom moves up and down, left and right, etc., it is possible to prevent swelling while ensuring that the hose group for the hydraulic cylinder and the like follows the movement, and the boom structure can be easily machined. .

[Brief description of the drawings]

1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a side view and FIG. 1B is a plan view.

2 (A) is a plan view, and FIG. 2 (B) is a cross-sectional view of a portion B of FIG. 2 (A).

FIG. 3 is a sectional view taken along the line RR of FIG. 1;

FIG. 4 is a plan view showing a second embodiment of the present invention.

5A and 5B show the entire configuration of the excavator, wherein FIG. 5A is a side view and FIG. 5B is a plan view.

FIG. 6 is a perspective view of FIG. 4;

[Explanation of symbols]

 Reference Signs List 4 swivel base 9 swing bracket 13 boom structure 19 root part 20 pivot 22 space 23 hose group

Claims (5)

[Claims] 1. A swing bracket (9) is pivotally attached to a swivel (4) about a vertical axis, and a root (19) of a boom structure (13) is attached to the swing bracket (9).
An excavator having a swing bracket (9) vertically movable via a lateral pivot (20), wherein the swing bracket (9) is sandwiched by the root part (19) of the boom structure (13). (20)
Pivotally at the root (19) in front of the pivot (20).
Group of hoses (23) for the hydraulic oil that has passed through the swing bracket (9), forming a space (22) surrounded by
The excavator is characterized by passing through the space (22) in an upward direction from below. 2. A swing bracket (9) is pivotally attached to the swivel (4) so as to be rotatable about a vertical axis, and the swing bracket (9) is attached to a base (19) of a boom structure (13).
Is vertically movable via a horizontal pivot (20), and the base (19) of the boom structure (13) is sandwiched by a swing bracket (9). (20)
Pivotally at the root (19) in front of the pivot (20).
Group of hoses (23) for the hydraulic oil that has passed through the swing bracket (9), forming a space (22) surrounded by
The excavator is characterized by passing through the space (22) in an upward direction from below. 3. The boom structure (13) further comprising a relay section (24) of a hose group (23) that has passed through the space (22) upward from below. 3. The excavator according to 1 or 2. 4. The boom base portion (19) fixed to the boom body is constituted by a forged product in which two members (19B) and (19C) having a symmetric shape are welded at their overlapping portions (19D). Boom structure of excavator. 5. A boom root according to claim 4, wherein
Is the fitting part (1) that fits with the boom body (13D).
9A), and the spigot fitting portion (19A) is inserted into the opening (13F) of the boom body (13D) and welded (2A).
1) A boom structure for an excavator, wherein