JP2002348909A - Excavating working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a hose from projecting to form a visual obstacle when a boom is elevated to the maximum. SOLUTION: In this excavating working machine, an absorbing part P-10 for absorbing a difference in length of a hose group P caused by vertical movement of the boom 20 is provided on a revolving frame 7 side.

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 more particularly to a piping structure for supplying and discharging hydraulic oil to and from a boom cylinder, an arm cylinder, and a bucket cylinder.

[0002]

2. Description of the Related Art An excavator such as a backhoe includes an excavator at a front edge of a swivel (traveling body). The excavator includes a boom that moves up and down by a boom cylinder and a pivot at a top side of the boom. An arm mounted and bent by an arm cylinder, a bucket pivotally mounted on the top side of the arm and operated by a dump cylinder with a bucket cylinder, a control valve provided on a swivel, and each of the cylinders Are connected via a flexible hose group to supply and discharge hydraulic oil.

[0003]

This excavator is provided with a boom that moves up and down, an arm that bends and extends, and a bucket that operates dump and squeeze. The control valve provided on the machine body) and each cylinder are connected by a flexible hydraulic hose. The hydraulic hose has a flexible hose length to the control valve between the highest position and the lowest position of the boom. To respond to changes in

[0004] However, in the prior art, the above-mentioned "Talmi"
That is, a curved portion for absorbing a difference in hose length is provided on the bottom side of the boom. In this case, when the boom moves up and down, the curved portion changes in size, and when the boom is raised, the swivel (traveling machine body) side. The curved portion protruded greatly, and the workability during excavation, particularly the visibility, was sacrificed. Further, the boom is pivotally attached to a swing bracket that swings in the left and right direction to perform a side ditching operation or the like, so that the boom can move up and down (up and down). You have to follow the movement,
The hose was liable to be twisted and the durability of the hose was likely to be impaired.

According to the present invention, a curved length absorbing portion for absorbing a difference in length of a hose due to the vertical movement of the boom is provided on the swivel table side, thereby eliminating obstruction of view and improving workability. Another object of the present invention is to provide a turning work machine capable of greatly improving hose durability.

[0006]

According to the present invention, there is provided a boom 20 which moves up and down by a boom cylinder 23, an arm 21 pivotally mounted on the top side of the boom 20 and bends and extends by an arm cylinder 24, and an arm 21 A bucket 22 pivotally mounted on the top side of the cylinder and being operated to dump and squeeze by a bucket cylinder 25. The control valve provided on the swivel 7 and the cylinders 23, 24, and 25 are flexible hoses. The following technical measures are taken in the excavator 1 connected to the group P to supply and discharge the hydraulic oil in order to achieve the above-mentioned object.

That is, the turning work machine according to claim 1 is
A curved length absorbing portion P-10 for absorbing a difference in hose length due to the vertical movement of the boom 20 is attached to the swivel 7.
It is characterized in that it is provided on the side. By adopting such a configuration, even when the boom 20 is moved up and down or the arm 21 is bent and extended to perform excavation work, the flexible hose group P may bend at the bottom side of the boom 20. Without having to do so, the hose does not obstruct the view, and the operator does not need to be careful that the hose comes into contact with the swivel base (slewing body). The performance can be improved.

Further, in the first aspect of the present invention, a swing bracket 16 is provided on the front edge side of the swivel table 7 so as to pivot the boom 20 so that the boom 20 can move up and down. It is recommended that the flexible hose group P be electrically connected in the front-rear direction (claim 2). With this configuration, the flexible hose group P moves in the front-rear direction with the vertical movement of the boom 20 to absorb the difference in the hose length, and as a result, the length of the swivel 7 side is reduced. The degree of curvature of the absorbing portion P-10 can be reduced, interference with various devices provided on the swivel 7 can be reduced, and the length absorbing portion P-10 can perform complicated vertical, left, and right movements. Without the hose twisting.

[0009] By forming the length absorbing portion P-10 on the side of the swivel 7, the bending direction of the hose can be curved upward or horizontal in consideration of various devices in the swivel 7. The degree of freedom of arrangement is improved. 3. The hoses P7 and P8 for the boom cylinder 23 in which the flexible hose group P is connected to the swing bracket 16, and the hoses for the arm cylinder 24 and the bucket cylinder 25 according to claim 1 or 2. Group P1
P4, and the divided hose group P1
It is recommended that .about.P4 be passed upward from below in the space A formed on the bottom side of the boom 20 (claim 3).

According to this, the hoses P7 and P8 for the boom cylinder 23 do not protrude outward at the bottom of the boom 20, and the hoses P7 and P8 are separated from the working hoses P1 to P6 so that the work The maintenance of the hoses P1 to P6 (for the arm, bucket, and service port) can be facilitated. The above-mentioned claim 3
, Flexible hose groups P <b> 1 to P <b> 1 passed upward from below in a space A formed on the bottom side of the boom 20.
P6 is a supply / discharge hose P1, P2 for the arm cylinder 24.
And the supply / discharge hoses P3, P4 for the bucket cylinder 25 and the supply / discharge hoses P5, P6 for the service port 29 are aligned on the upper surface side of the boom 20, and the supply / discharge hoses P1, P2, P3, P4 are arranged. , P5, and P6 are each connected to a steel pipe 1P via a relay portion 28 (claim 4).

According to this, the working hoses P1 to P6 are accommodated within the width of the boom 20 and are aligned and run along the boom longitudinal direction, thereby eliminating the obstruction of visibility.
Interference with other things is also reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the entire configuration of an excavator (backhoe) 1. A traveling device 3 exemplified by left and right crawlers 2 is capable of traveling by driving a driving sprocket by a traveling motor 4 such as a hydraulic pressure. A swivel table (slewing body) is provided on a traveling device 3 and a track frame 5 which substantially supports the left and right crawlers 2 via a swivel bearing 6.
A dozer 8 is provided at the front of the track frame 5 between the left and right crawlers 2 so as to be able to make a full turn (360 ° rotation) around the vertical axis OO.

An engine 9 is mounted on the rear upper surface of the swivel 7.
And is protected by protector 11,
A seat 12 is provided on the hood 10. The driving control device including the seat 12 is surrounded by a cabin 13, and the entrance of the cabin 13 has an entrance door 14.
Is provided so that it can be freely opened and closed. A mounting bracket 15 is fixed to the left and right intermediate portion at the front edge of the revolving base 7 so as to protrude forward. A swing bracket 16 is swingable on the mounting bracket 15 via a vertical axis 17 (around the vertical axis). A swing cylinder (not shown) exemplified by a telescopic cylinder is interposed between the swing bracket 16 and the swivel table 7 so that the swing bracket 16 can be extended and contracted by the telescopic operation of the cylinder. Swing operation is possible in the left-right direction.

An excavator 19 is provided on the swing bracket 16 via a pivot 18 which is a horizontal axis in the vertical direction so that the excavator 19 can move up and down.
0, an arm 21 attached (pivotally attached) to the front end (top connecting portion) of the structure 20 so as to be able to undulate (bend and extend).
A bucket 22 is attached to the tip of the arm 21 so as to be rotatable (squeezing operation or scraping operation and discharging operation or loading operation).
Reference numeral 9 indicates that excavation work such as digging and loading work can be performed by expansion and contraction operations of hydraulic actuators such as a boom cylinder 23, an arm cylinder 24, and a bucket cylinder 25.

That is, the excavator 19 includes a boom 20 that moves up and down by a boom cylinder 23, an arm 21 that is pivotally mounted on the top side of the boom 20 and that bends and extends by an arm cylinder 24, and a top side of the arm 21. And a bucket 22 pivotally mounted on the bucket and performing a dump / squeeze operation by a bucket cylinder 25. A control valve provided on a swivel (traveling body) 7 and the cylinders 23, 24, 2
5 is connected via a flexible hose group P to supply and discharge hydraulic oil. The details of the configuration of the boom structure 20 and the movement (behavior) of the hose group P associated with the behavior (vertical movement) will be described with reference to FIGS.

1 and 2, the boom structure 20
Is a boomerang shape in a side view, and is formed from a bent portion at an intermediate portion in a longitudinal direction to a bottom connecting portion (bifurcated portion) 2
The boom main body 20B is tapered toward 0A and the top connecting portion 20C, and has a boomerang shape (bow shape or L-shape) in a side view. This boom structure 2
Reference numeral 0 denotes a boom body 20B having a box-shaped cross section as shown in FIG. 2 (3), a hollow inside, and chamfered 20B-1 at four corners at the top, bottom, left and right, and press working of a metal plate material such as a steel plate, an iron plate or the like. Alternatively, a pair of bent U-shaped members 20B-2 are butted against each other, and the butted portion is welded and joined 20B-3 along the boom longitudinal direction.

The bottom connecting portion (two-rooted portion) 20A of the boom structure 20 is connected to the root opening 20D of the boom body 20B.
As shown in FIG. 1, there is provided a fitting portion 20E which is fitted with a spigot, and a pair of arms 20F is provided on both the left and right sides with the fitting portion as a bifurcated base. Arm 20F), and an insertion hole 20F-1 for the pivot 18 is formed in the opposing portion of the pair of arms 20F. The bottom connecting portion 20A is entirely made of metal like a cast steel material, and is fitted by fitting a fitting portion 20E into a root opening 20D and welding the fitting periphery.

As shown in FIG. 1 (2), the swing bracket 16 is pivotally mounted on a horizontal pivot 18 while being sandwiched between the bifurcated portions 20A of the boom structure 20, specifically, a pair of arms 20F. A bifurcated root 20 in front of the lever 18
A space A surrounded by A is formed, and a hose group P for hydraulic oil passes through the space A from below to above. 2 above
The arm 2 which is a forked part is provided on the forked part of the root part 20A.
A guide surface A1 of a hose group P inclined downwardly by connecting 0F is formed. That is, the guide surface A1 of the hose group P is formed on the forked base of the forked base 20A so as to be inclined downward from the upper surface of the boom main body 20B toward the pivot 18.
The partition A2 having the guide surface A1 is formed in a triangular cross section as shown in FIG. 2A, and the inside of the partition A2 is a cavity 20D-1 communicating with the opening 20D.
While the weight is reduced by the cavity 20D-1 (the weight of the whole boom is reduced), the bifurcated root portion 20A is connected to the bases of the left and right arms 20F by the bridge configuration with the partition wall A2 to strengthen each other.

On the upper surface side of the boom body 20B, a two-pronged
In the vicinity of the guide surface A1 of 0A, a clamp body 26 of a hose group P that has passed through the space A from the bottom upward is provided. The hose group P includes two supply / discharge hoses P1 and P2 for extending and retracting the arm cylinder 24, two supply / discharge hoses P3 and P4 for extending and retracting the bucket cylinder 25, and hydraulic equipment such as a breaker. A total of six supply / discharge hoses P5 and P6, which are service hoses, and eight supply / discharge hoses P7 and P8 for extending and retracting the boom cylinder 23, as shown in FIG. Each control valve (not shown) which is inserted in the bracket 15 in the front-back direction and is provided in the swivel 7
The hoses P1 to P8 are made of pressure-resistant and flexible, and can follow the behavior of the excavator 19 (bending and stretching operations, left and right swing operations, etc.), and the boom 20 shown in FIG. Because the difference in hose length is large between the position X at the time of the highest rise and the position Y at the time of the lowest descent of the boom 20, the hoses P1 to P8 have flexibility to absorb this difference, and the length inside the swivel 7 is large. A curved portion (length absorbing portion) P-10 for absorbing the difference between the two is formed (see FIG. 6).

That is, conventionally, the length absorbing portion is provided near the bottom connecting portion 20A of the boom 20. In this case, when the boom 20 is at the highest position X as shown in FIG. Although it interferes with the front side of the cabin 13 and the like and obstructs visibility when the cabin is absent, the length absorption part P-10 is located inside the swivel 7 as shown in FIG. Upper and lower bulkheads 1 formed inside swing bracket 16 to prevent obstacles
By inserting the hoses P1 to P8 between 6B and 16C, the hoses P1 to P8 are protected by the protector action of the partition walls 16B and 16C of the swing bracket 16, and the bracket 16 is strengthened by the partition walls 16B and 16C. is there.

Further, the flexible hose group P is clamped (held) by the clamp body 26 near the guide surface A1.
By doing so, the hose group P along the guide surface A1
The behavior such as floating of the surface is prevented. The clamp body 26
As shown in FIG. 2 (4), there is provided an elastic holding body (cushion holding body) 26C formed with a groove 26A for holding the hoses P1 to P4 aligned and holding, and a groove 26B for holding the hoses P5 and P6 individually left and right. Hose presser 2 for pressing hoses P1 to P6 held in grooves
6D, and is mounted to screw the bolt 26F into the screw hole 26E shown in FIG. 2 (2).

With the clamp body 26, the hose group P is passed along the guide surface A1 with the space A passing upward with the space A from below, and the length absorbing portion P-10 is formed inside the swivel 7. With this arrangement, the hose group P comes in contact with the lower part of the pivot 18 (substantially, the cylindrical part passing through the pivot 18) at the boom maximum elevating position X and the intermediate position Z shown in FIG. The hose group P moves only to release the contact, and here, even if the boom 20 moves up and down (bending and stretching movements), the hose group P remains in the cabin 1.
It is prevented from protruding toward the third side or the driver's seat side.

On the upper surface of the swing bracket 16, a mounting screw 16A for a hanging tool for carrying the loading / unloading or assembling / disassembling of the turning work machine 1 is formed, and the mounting screw 16A is used. Clamp body (hose guide rod)
Providing the detachable 27 is advantageous in preventing unnecessary movement of the hose group P. The flexible hose group P passed through the space A from the bottom upward is connected to the arm cylinder 24, the bucket cylinder 25, and the service port 29 via a relay (one-touch coupler) 28 on the upper surface of the boom structure 20, respectively. A pipe group 1P made of steel pipes for supplying and discharging hydraulic oil is connected to the flexible hose group P.
And the pipe group 1P made of steel pipes are both aligned (aggregated) and arranged side by side within the upper surface width of the boom body 20B, and the hose group P and the pipe group 1P are well accommodated and do not go out of the boom width. Do not become a hindrance to visibility.

The supply / discharge hoses P7, P8 for the boom cylinder 23 are also introduced into the swing bracket 16 and connected to the control valve on the swivel table 7, so that the hoses P7, P8 can be connected to a visual obstacle. It never becomes. Further, in FIG. 7, the service port 29 is provided with a stop valve 29A. The valve body 29B is fixed to the side of the arm with a bolt 29C, and the stop valve 29A is rotated about its axis. The supply of hydraulic oil to the service port 29 can be stopped, and the stop valve 29A is rotatably incorporated in the valve body 29B, so that the front and rear length is designed to be compact.

FIG. 3 shows the boom structure 20 and the hose group P at the intermediate position Z in FIG. 5, and FIG. 4 shows the boom structure 20 and the hose group P at the lowest position Y in FIG. 5, respectively. And the highest position X shown in FIG.
The parts common to the boom structure 20 and the like in FIG. FIG. 6 shows another embodiment of the present invention, in which the bifurcated portion 20A of the boom structure 20 is pivotally mounted on a lateral pivot 18 while being sandwiched by a swing bracket 16, and is provided in front of the pivot 18. A space A surrounded by a two-pronged base portion 20A is formed, and a portion having a guide surface A1 of a hose group P is the same as that of the above-described embodiment.

FIGS. 8 (1) (2) and 9 (1) (2)
Shows another embodiment of the present invention, in which a two-pronged (bottom connecting portion) 20A is divided by a center (butting surface L), and this divided portion is welded by a butting surface L. Since other configurations are common to those of the first embodiment shown in FIGS. 2 to 5, common portions use common reference numerals.
In each of the above-described embodiments, the top connecting portion 20
About C, it is set as the same structure as 20 A of bottom connection parts.

[0027]

According to the present invention, the endurance of the hose group can be improved without hindrance of the hose group.

[Brief description of the drawings]

FIG. 1 is an overall side view of a box hook according to the present invention.

FIG. 2 shows a relationship between a boom structure and a hose group,
(1) is an elevational view at the time of the highest movement (position), (2) is a rear view, (3) is a sectional view of a boom, and (4) is an exploded view of a clamp body.

FIG. 3 is a side view of the boom at an intermediate position.

FIG. 4 is a side view of the boom at the lowest position.

FIG. 5 is a side view showing the behavior (bending and stretching, etc.) of the boom.

FIG. 6 is a perspective view of a main part showing another embodiment of the present invention.

FIG. 7 is an enlarged view of a service port portion.

FIG. 8 shows another embodiment of the present invention, wherein (1) is a side view, and (2) is a plan (rear) view.

9 shows a main part of FIG. 8, (1) is a plan view, and (2) is a partial sectional view.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 turning machine 7 turning table 16 swing bracket 18 pivot 20 boom structure 21 arm 22 bucket 23 boom cylinder 24 arm cylinder 25 bucket cylinder A space P hose group

Claims (4)

[Claims] 1. A boom (20) that moves up and down by a boom cylinder (23), an arm (21) pivotally mounted on the top side of the boom (20) and bends and extends by an arm cylinder (24), A bucket (22) pivotally mounted on the top side of the arm (21) and performing a dump / squeeze operation by a bucket cylinder (25); a control valve provided on the swivel (7); and the cylinders (23). (24)
(25) is connected through a flexible hose group (P) to supply and discharge hydraulic oil. A curved length absorbing part (P-10) for absorbing the accompanying hose length difference,
An excavator equipped on the swivel (7) side. 2. A boom (2) is provided on the front edge side of the swivel (7).
0) is provided with a swing bracket (16) that can swing right and left so as to be vertically movable. A flexible hose group (P) is conducted inside the swing bracket (16) in the front-rear direction. 2. The method according to claim 1, wherein
An excavator according to item 1. 3. A hose (P7) (P8) for a boom cylinder (23) in which the flexible hose group (P) is conducted to a swing bracket (16), and a hose for an arm cylinder (24) and a bucket. It is divided into a hose group (P1 to P4) for the cylinder (25), and the divided hose group (P1 to P4) is placed from below into a space (A) formed on the bottom side of the boom (20). The excavator according to claim 1, wherein the excavator is passed upward. 4. A group of flexible hoses (P1 to P6) passed upward from below into a space (A) formed on the bottom side of the boom (20). Discharge hose (P1) (P2) and bucket cylinder (2
5) The supply / discharge hoses (P3) and (P4) for the service port (29) and the supply / discharge hoses (P5) and (P6) for the service port (29) are arranged on the upper surface side of the boom (20). Hose (P1) (P2) (P3) (P4) (P5)
The excavator according to claim 3, wherein a steel pipe (1P) is connected to each of the (P6) via a relay section (28).