JPH07180177A - Construction machine - Google Patents

Abstract

PURPOSE:To prevent respective feed and discharge pipes from being damaged due to abrasion thereof, by providing a pipe guide preventing the slackened parts of respective pipes from falling to the right or left, when the boom of a construction machine is raised or lowered against the machine body. CONSTITUTION:When a boom cylinder 12 is contracted to lower the boom 9, respective feed and discharge pipes 18 are bent with a large radius of curvature. At this moment, respective first links 32 are turned to the rear side on a beam 9 and the second links 33 connected to the front end side of the first links are turned to the front side. And further, a hose clamp 37 is appropriately turned at the front side of the second link 3 together with a support plate 36 to support the feed and discharge pipes 18 at the state that the pipe guide 31 is contracted on the boom 9. On the other hand, when the boom cylinder 12 is stretched to raise the boom 9, respective pipes 18 are bent with a small radius of curvature. At this moment, the second link 33 connected to the front end side of the first links 32 is turned to the rear side. In this way, respective feed and discharge pipes 18 are supported by the pipe guide 31 in the state that it is stretched on the boom 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine capable of preventing damage due to wear to a supply / discharge pipe located between a boom and an arm of a working device.

[0002]

2. Description of the Related Art FIGS. 5 to 7 show a conventional hydraulic excavator equipped with a bottom dump type loader bucket.

In the figure, 1 is a lower traveling body, 2 is an upper revolving body as a working machine body mounted on the lower traveling body 1 so as to be rotatable, and the upper revolving body 2 is provided on a revolving frame 3. Machine room 4, a cab 5 provided on the left side of the front of the machine room 4, a fuel tank 6 provided on the right side of the cab 5, and a counter provided at the rear of the machine room 4. It is composed of weights 7 and the like.

Reference numeral 8 denotes a working device provided on the front side of the upper revolving structure 2 so as to be able to move up and down. The working device 8 is a boom 9, an arm 10, a front bucket 11A and a rear bucket 11.
Bucket 11 made of B, boom cylinder 12 as a hydraulic cylinder, arm cylinder 13, level cylinder 1
4, the bucket cylinder 15 and the like.
Here, the boom 9 is attached to a support bracket 16 (see FIG. 6) provided between the driver's cab 5 and the fuel tank 6 and the like in a front portion of the revolving frame 3 via a pin 17 so as to be able to lift and lower. ing.

Reference numerals 18, 18, ... Show supply and discharge pipes, and each of the supply and discharge pipes 18 is composed of a plurality of flexible hoses extending in the length direction of the working device 8, and the upper swing body 2 and the working device 8 are connected. A slack portion 18A in which a portion between the boom 9 and the boom 9 bends in a convex curve.
Has become. The supply / discharge pipes 18 supply / discharge the pressure oil from the hydraulic pump arranged in the machine chamber 4 of the upper revolving structure 2 to the cylinders 12, 13, 14, 15 and the like.

Reference numeral 19 denotes a clamp provided on the slack portion 18A of the supply / discharge pipes 18, 18, ...
As shown in FIG. 7, reference numeral 9 designates upper and lower clamp members 20, 2
1 and the upper clamp member 20 is a semicircular recess 20A, 20A, ...
, And each of the three recesses 20A is spaced apart from each other and has screw insertion holes 20B, 20B, ... Also,
The lower clamp member 21 is formed in an upper and lower symmetrical shape with the upper clamp member 20, and has semicircular recesses 21A and 21A.
, And the screw insertion hole 2 formed between the recess 21A.
1B, 21B, ... (Only one is shown). Then, the respective clamp members 20 and 21 are provided with the respective concave portions 20A and 21.
The supply / discharge pipes 18 are assembled by sandwiching the supply / discharge pipes 18 between A, the bolts 22 are inserted into the screw insertion holes 20B, 21B, and the nuts 23, 23 are fastened to the bolts 22. Are designed to be bundled.

In the hydraulic excavator constructed as above,
The boom cylinder 12 and the arm cylinder 13 are used by the boom cylinder 12 and the arm cylinder 13 when excavating earth and sand.
0 is lifted and the bucket 11 is moved to the bucket cylinder 15
To excavate earth and sand. Further, when the earth and sand stored in the bucket 11 is transferred to a truck or the like, the bottom bucket cylinder (not shown) opens the front bucket 11A downward with respect to the rear bucket 11B.

Here, when operating the working device 8,
Between the upper swing body 2 and the boom 9, the supply / discharge pipes 18 are elastically deformed so that the curvature of the slack portion 18A changes.
Pressure oil is supplied to and discharged from each of the cylinders 12 to 15. The clamp 19 bundles the supply / discharge pipes 18 with each other in the horizontal direction,
Since the horizontal movements of the supply / discharge pipes 18 are restricted, the supply / discharge pipes 18 are subject to vibrations during excavation work.
It is designed to prevent the pieces from falling apart or falling to the left or right.

[0009]

By the way, in the hydraulic excavator according to the above-mentioned prior art, each supply / discharge pipe 1 is used during work.
In order to prevent 8 from falling in the left and right directions, a clamp 19 is attached to the slack portion 18A of each supply / discharge pipe 18.
Is provided.

However, in a large hydraulic excavator or the like, since the supply / discharge pipes 18 are long and have large weights, the slack portion 18A also becomes large, and even if the clamps 19 are bundled, the supply / discharge pipes 18 are It may be elastically deformed and fall in the left and right directions.
Comes into contact with the driver's cab 5 or the like, and the supply / discharge pipe 18 is worn. Since high pressure oil flows inside each supply / discharge pipe 18, when the supply / discharge pipe 18 is worn, the pressure oil leaks or spouts to the outside of the supply / discharge pipe 18. There's a problem.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention prevents the slack portion of the supply / discharge pipe from collapsing, thereby preventing damage to the supply / discharge pipe due to wear. The purpose is to provide such construction machinery.

[0012]

The features of the configuration adopted by the present invention to solve the above-mentioned problems are that a boom of a working apparatus is provided with each feed when the boom is raised and lowered with respect to the main body of the working machine. This is because a pipe guide was provided to prevent the slack in the exhaust pipe from falling to the left or right.

In this case, the pipe guide includes a pair of left and right first links which are spaced apart in the left and right directions of the boom and whose base end side is rotatably connected to the boom in the front and rear directions. A pair of left and right second links whose base end side is rotatably connected to the tip side of the first link in the front and rear directions, and left and right end sides are turnable to the tip side of each of the second links. And a hose clamp that integrally holds the slack portions of the supply and discharge pipes.

[0014]

With the above configuration, even when the boom is raised and lowered with respect to the work machine body, the slack portions of the supply and discharge pipes are regulated by the pipe guides, so that the slack portions fall in the left and right directions. It is possible to prevent friction between the supply and discharge pipes.

In this case, the piping guide is provided with a pair of left and right first links which are spaced apart in the left and right directions of the boom and whose base end side is rotatably connected to the boom in the front and rear directions. A pair of left and right second links whose base end side is rotatably connected to the tip side of the first link in the front and rear directions, and left and right end sides are turnable to the tip side of each of the second links. And a hose clamp that integrally holds the slack portions of the supply and discharge pipes, the first and second links rotate forward and backward between the boom and the hose clamp. This allows the pipe guide to expand and contract while supporting the supply and discharge pipes on the boom, and to prevent the slack portions of the supply and discharge pipes from bending (deforming) while preventing the pipes from falling in the left and right directions.

[0016]

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, 31 indicates a piping guide used in this embodiment, and the piping guide 31 is a first link 32, which will be described later.
The second link 33, the hose clamp 37, etc. are generally configured.

Reference numerals 32 and 32 denote a pair of left and right first links. As shown in FIG. 2, each of the first links 32 is fixed to the upper portion of the boom 9 so as to be spaced apart to the left and right toward the support bracket 16 side. And a plate shape in which the upper end side is branched into a substantially U-shape, and each of the mounting bracket portions 32A is rotatably pinned in the forward and backward directions via a pin 34 and a retaining ring 35 described later. Link member 32B and a support bracket portion 32C that is fixed to the tip of each link member 32B by means such as welding and has an upper end branched into a substantially U-shape.

Reference numerals 33, 33 denote a pair of left and right second links which are located at the tip ends of the first links 32, 32 and are pivotally connected to each other in the front and rear directions.
Like the first link 32, is composed of a plate-shaped link member 33A and a substantially U-shaped support bracket portion 33B fixed to the tip of the link member 33A. Here, as shown in FIG. 3, the base end side of the link member 33A is inserted into the U-shaped gap of the support bracket portion 32C of the first link 32 and can be rotated by using the pin 34 and the snap ring 35. Are linked to. The link member 33A is allowed to rotate within the gap of the support bracket portion 33B, and the tilting movement in the left and right directions is restricted, so that the second link 33 is left relative to the first link 32. The tilting to the right is restricted, and only the displacement of the working device 8 in the longitudinal direction (front and rear) is allowed. The structure of the pin coupling by the pin 34 and the snap ring 35 is the same as that of the first link 32.
Mounting bracket portion 32A and link member 32B that configure the
The pipe guide 31 is also used in the same manner for the connection portion between the support bracket portion 33B and the support plate 36, which will be described later, so that the pipe guide 31 does not fall in the left and right directions.

Reference numeral 36 denotes a support plate rotatably connected to the support bracket portion 33B of each of the second links 33 and to which a hose clamp 37 described later is attached.
Pins 3 are attached to the left and right support brackets 33B on both ends.
A connecting portion 36A is rotatably connected using 4 or the like, and a plate-like portion 36B is horizontally connected to the upper end of each connecting portion 36A.

Reference numeral 37 designates a hose clamp, which is a long rectangular parallelepiped-shaped upper and lower clamp members 3 in substantially the same manner as the clamp 19 according to the prior art.
8 and 39, the upper clamp member 38 has semicircular recesses 38A, 38A, ... Formed at predetermined intervals. Also, the lower clamp members 39, 3
Are formed symmetrically with respect to the upper clamp member 38, and semicircular recesses 39A, 39A, ... Are formed at positions facing the recesses 38A. Then, the clamp members 38 and 39 are combined as shown in FIG.
Each recess 38A, 39A is a slack portion 18A of the supply / discharge pipe 18.
Of the screws 40, 4 in the screw insertion holes
It is fixed on the support plate 36 via 0, ....

Reference numerals 41 and 41 denote the first links 32 and 32, respectively.
Are connected in the left and right directions, and each of the first and second link members 41 allows the first links 32 to rotate simultaneously on the boom 9 in the front and rear directions with the same swing width. And the pipe guide 31 is reinforced at the same time so as not to bend.

Reference numerals 42 and 42 denote the second links 33 and 33, respectively.
Are connected in the left and right directions, and each connecting member 42 is similar to each connecting member 41 in that each second link 33
Is rotated forward and backward in synchronization with the tip end side of the first link 32, and the pipe guide 31 is reinforced.

The hydraulic excavator according to the present embodiment has the above-mentioned structure, and its basic operation is not different from that of the prior art.

Next, the operation of the pipe guide 31 will be described with reference to FIGS.

First, when the boom cylinder 12 is contracted to lower the boom 9 (the bucket 11 is moved downward), as shown in FIG. 1, each supply / discharge pipe 18 draws an arc of a large radius of curvature. To bend. At this time, each first link 32
Rotates backward on the boom 9, and the second link 33 connected to the tip side of each link 32 rotates forward.
Further, the hose clamp 37 appropriately rotates together with the support plate 36 at the tip end side of the second link 33, so that the pipe guide 31 supports each supply / discharge pipe 18 in a contracted state on the boom 9.

On the other hand, when the boom cylinder 12 is extended and the boom 9 is raised (the bucket 11 is moved upward), as shown in FIG. 4, each supply / discharge pipe 18 is bent so as to draw an arc having a small radius of curvature. Then, at this time, each first link 32 rotates in the forward direction on the boom 9, and the second link 33 connected to the tip end side of each link 32 rotates in the rear direction. As a result, the pipe guide 31 supports the supply / discharge pipes 18 in a state where the pipe guide 31 extends on the boom 9.

When the pipe guide 31 expands and contracts as described above, each of the first link 32 and the second link 33 rotates forward and backward between the boom 9 and the hose clamp 37, so that Slack portion 1 of supply / discharge pipe 18
8A can be bent (deformed), and can be restrained from falling in the left and right directions, so that it is possible to reliably prevent the slack portions 18A from coming into contact with the operator cab 5 or the like and causing wear. The life of each supply / discharge pipe 18 can be reliably extended.

As a result, it is possible to avoid an accident in which the supply / discharge pipes 18 are damaged and the pressure oil inside leaks or the pressure oil is jetted to the outside of the supply / discharge pipes 18, so that the maintenance work is greatly troublesome. The reliability can be improved.

In the above embodiment, each first link 32 is
Although the connection members 41, 41 are provided between the second links 33 and the connection members 42, 42 are provided between the second links 33, the present invention is not limited to this, and the connection members 41, 42 are not necessarily provided. Alternatively, the piping guide may be configured by connecting three or more links.

In the above embodiment, the working device is
The case of the hydraulic excavator using the loader type has been described, but the present invention is not limited to this, and a backhoe type may be used.

Further, although the hydraulic excavator has been described in the above embodiment, it may be used in a construction machine such as a backhoe boat, for example.

[0033]

As described above in detail, according to the present invention, in the boom of the working device, when the boom is rotated with respect to the main body of the working machine, the slack portions of the supply and discharge pipes are moved to the left and right. By providing a pipe guide to prevent the pipes from falling over, it is possible to reliably prevent the slack part of each supply / discharge pipe from coming into contact with the driver's cab or the like and wear it, and effectively extend the life of each supply / discharge pipe. You can

The pipe guide is spaced apart in the left and right directions of the boom, and the base end side is rotatably connected to the boom in the front and rear directions. A pair of left and right second links whose end side is rotatably connected to the tip side of the first link in the front and rear directions, and left and right end sides are turnable to the tip side of each of the second links. If the hose clamps are connected to each other and sandwich the slack portion of each supply / discharge pipe, the first link and the second link move between the boom and the hose clamp as the supply / discharge pipe moves. By rotating in the forward and backward directions, the pipe guide expands and contracts while supporting each supply / discharge pipe on the boom, allowing the slack part of each supply / discharge pipe to bend (deform), You can prevent falling in the direction.

[Brief description of drawings]

FIG. 1 is a side view showing an upper swing body, a boom, a pipe guide and the like of a hydraulic excavator according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a state in which the piping guide in FIG. 1 is viewed from the front.

3 is an enlarged cross-sectional view showing a connecting portion between a first link and a second link in FIG.

FIG. 4 is a side view similar to FIG. 1, showing a state in which the boom of the hydraulic excavator is lifted.

FIG. 5 is a side view showing a conventional hydraulic excavator.

6 is an enlarged side view showing an upper revolving structure, a boom, a clamp and the like in FIG.

FIG. 7 is a partially cutaway front view showing a state where the clamp in FIG. 6 is viewed from the front.

[Explanation of symbols]

 2 Upper revolving structure (work machine main body) 8 Working device 9 Boom 10 Arm 11 Bucket 12 Boom cylinder 13 Arm cylinder 14 Level cylinder 15 Bucket cylinder 16 Support bracket 18 Supply / discharge pipe 18A Slack part 31 Piping guide 32 First link 32A Mounting bracket Part 32B Link member 32C Support bracket part 33 Second link 33A Link member 33B Support bracket part 37 Hose clamp

Claims (2)

[Claims] 1. A working device main body, a working device having a boom which is provided on the working device main body so as to be capable of being lifted and lowered, and a boom operated by a hydraulic cylinder, and pressure oil is supplied to and discharged from each hydraulic cylinder of the working device. Therefore, in a construction machine including a plurality of supply / discharge pipes that extend in the length direction of the working device, and a portion between the boom of the working device and the main body of the working device is a slack portion that bends in a convex curve shape. The boom of the working device is provided with a pipe guide that restricts the slack portions of the supply and discharge pipes from falling to the left and right when the boom is raised and lowered with respect to the work machine body. A characteristic construction machine. 2. The pipe guide includes a pair of left and right first links, which are spaced apart in the left and right directions of the boom and whose base end side is rotatably connected to the boom in the front and rear directions. A pair of left and right second links whose end sides are rotatably connected to the front end side of the first link in the front and rear directions, and left and right end sides of the second links.
The construction machine according to claim 1, wherein the construction machine comprises a hose clamp that is rotatably connected to a tip end side of the link and integrally holds a slack portion of each of the supply and discharge pipes.