JP2000170206A - Mounting structure for protecting hydraulic piping of offset boom type excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent hydraulic hoses arranged on a side surface of right and left side surfaces of a base boom so as to move from a back surface of the base boom from being brought into slide contact with a corner part of the base boom. SOLUTION: An inside caver body 23 and an outside cover body 24 are attached on a tip end part of a base boom 7 to form a piping protecting cover means 27 having a piping through inlet 25 and a piping through outlet 26, and a piping holding means 28 is attached on a side of the piping through inlet 25. Hydraulic hoses 21 arranged on a back surface 7a of the back surface are passed from the piping through inlet 25 through the piping through outlet 26 to arrange on a side surface 7b of right and left side surfaces of the base boom 7 so as to move. Parts wherein hydraulic hoses 21 are exceeded a corner part 7c are held by the piping holding means 28 to prevent from being brought into slide contact with the corner part 7c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pipe protection mounting structure for protecting a hydraulic pipe from a base boom to an offset boom of an offset boom type excavator.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open Publication No. Hei 6-71549 proposes a pipe protection mounting structure for an offset boom type excavator. Specifically, an offset boom is attached to the distal end side of the base boom so as to be able to swing left and right to form an offset boom, and hydraulic piping is arranged along one left and right side surface from the base end of the base boom to the distal end. A pipe protection cover for protecting the hydraulic pipe is attached so that the hydraulic pipe does not come into contact with an external obstacle to be damaged.

[0003]

In the above-described hydraulic pipe protection mounting structure, the hydraulic pipe runs along one of the right and left sides from the base end to the tip end of the base boom. During operation, there are many chances of being damaged by contact with a placement device located on the side of the base boom or by contact with an external obstacle. In addition, arranging hydraulic piping on one side of the base boom and mounting it with the pipe protection cover over it requires extra space in the lateral direction of the base boom. It is required to expand the installation space for equipment such as the fuel tank, hydraulic oil tank, or hydraulic switching valve group for work equipment control installed on the upper vehicle body, which increases the mounting area of the revolving structure and increases the upper body There is a problem that it is difficult to keep the turning radius of the vehicle within the left and right outer widths of the traveling body.

As a means for solving the above problem, even if the base boom swings by laying the hydraulic pipe on the back surface of the base boom, the hydraulic pipe located within the width of the base boom may be provided with other arrangement equipment or other equipment. Avoid contact with external obstacles. Also, there is no need for mounting space for hydraulic piping or a pipe protection cover in the lateral direction of the base boom, and the space for mounting the above-mentioned devices can be reduced, so that the turning radius of the upper vehicle body is kept within the left and right outer widths of the traveling body. It becomes possible. However, it is necessary to move the hydraulic piping from the rear end of the base boom to the left and right sides of the base boom so that the hydraulic piping is rubbed at the corner where the rear of the base boom and the left and right sides intersect. Damage problems.

Accordingly, an object of the present invention is to provide a hydraulic pipe protection mounting structure for an offset boom type excavator which can solve the above-mentioned problems.

[0006]

The first invention provides an offset boom excavator having an offset boom in which an offset boom 8 is connected to the tip of a base boom 7 so as to be able to swing left and right. The base boom 7
A pipe protection cover means 27 is attached to the front end of the base boom 7 and the pipe through inlet 25 is opened over the front end portion of the rear face 7a of the base boom 7 and the portion protruding laterally beyond the left and right side surfaces 7b of the base boom 7. A pipe through outlet 26 is formed continuously from the pipe through inlet 25 to the front side of the base boom 7 from the tip side of the left and right one side surface 7b of the base boom 7;
A pipe holding means 28 is attached to the pipe passage inlet 25 side,
The distal end of the hydraulic pipe disposed along the back surface 7a of the base boom 7 is disposed from the pipe passing inlet 25 to the pipe passing outlet 26, and the hydraulic pipe is held at the pipe passing inlet 25 by the pipe holding means 28. A hydraulic pipe protection mounting structure for an offset boom type excavator, characterized in that:

According to the first aspect, the hydraulic piping is moved from the back surface 7a of the base boom 7 to the side of the base boom 7 at a position away from the corner 7c of the base boom 7. As a result, the hydraulic piping transferred to the side surface of the base boom is also protected by the piping protection cover means 27 without the hydraulic piping coming into contact with the corner corner 7c of the base boom 7, so that damage can be prevented.

According to a second aspect of the present invention, in the first aspect, the cover body 23 attached to the tip of the distribution surface 7a of the base boom 7 is provided.
And an outer cover 24 having a substantially U-shaped cross section which is detachably attached to the inner cover 23 and the front end portions of the left and right side surfaces 7b of the base boom 7.
The inner cover body 23 includes a horizontal plate 30 installed on the back surface of the base boom 7, and an upward vertical plate for mounting the outer cover body standing up from the back surface 7 a of the base boom 7 continuously with the horizontal plate 30. 31 is a hydraulic pipe protection mounting structure of an offset boom type excavator having a downward vertical plate 32 that covers a corner 7c of the base boom 7 continuously with the horizontal plate 30.

According to the second aspect, the inner cover body 23 and the outer cover body 24 are attached to the back surface 7a and the left and right side surfaces 7b of the base boom 7, respectively. The inner cover body 23 does not fall off, and the pipe can be easily assembled by covering the outer cover body 24 after the pipe is mounted by holding the pipe on the pipe holding means 28 provided on the inner cover body 23.

A third aspect of the present invention is the second aspect of the present invention, in which the U-shaped holding pedestal 5 is opened to the left and right side surfaces 7b of the base boom 7 on the side of the inner cover body 23 through the pipe passage inlet 25.
0, and a plurality of pipe clamping members 5
1 are sequentially fitted to form a pipe holding means 28 having a shape for holding the hydraulic pipe.
4 is a hydraulic pipe protection mounting structure of an offset boom type excavator that presses a pressurizing member 4.

According to the third aspect, the hydraulic piping can be easily held after the inner cover body 23 is attached, and the hydraulic piping can be easily removed. Moreover, if the outer cover body 24 is attached, the hydraulic pipe can be held firmly so as not to come off.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an upper turning body 3 is attached to a lower body 2 provided with a traveling body 1 by a turning mechanism 4 so as to be turnable. A driver's cab 5 is mounted on the upper turning vehicle body 3, and a working machine 6 is mounted so as to be vertically swingable. The work machine 6 includes a base boom 7 attached to the upper turning vehicle body 3 so as to be able to swing up and down, an offset boom 8 which is connected to the tip side of the base boom 7 so as to be able to swing left and right, and The work machine 6 includes an offset boom, a swing bracket 9 freely connected to the arm, an arm 10 connected to the swing bracket 9 so as to be vertically swingable, and a bucket 11 attached to the arm 10 so as to be vertically swingable. It forms an offset boom type excavator.

A base boom cylinder 12 is connected to the upper turning body 3 and the base boom 7. An offset stay 13 is connected to the base boom 7 and the swing bracket 9, and an offset cylinder 14 is connected to the offset boom 8 and the swing bracket 9. On the other hand, the offset boom 8 swings right and left, and the arm 10 moves left and right in parallel. The swing bracket 9
And an arm cylinder 15 is connected to the arm 10. The bucket 11 swings up and down by a bucket cylinder 16.

An offset cylinder 14, an arm cylinder 1 and a valve (not shown) provided on the upper turning body 3
5. Hydraulic piping to the bucket cylinder 16 is provided from the back surface 7a of the base boom 7 (the surface on the vehicle rear side) through the inside of the offset boom 8.

Next, offset 8 from the base boom 7
The piping structure up to this point will be described. As shown in FIGS. 2 and 3,
Hydraulic piping 2 on the base boom side is provided on the back 7a of the base boom 7.
0 is provided. The base boom-side hydraulic pipe 20 has a length up to near the tip of the base boom 7, and a hydraulic hose 21 is connected to the base boom-side hydraulic pipe 20. The hydraulic hose 21 extends from the corner 7c between the back surface 7a of the base boom 7 and the left and right side surfaces 7b to the left and right side surfaces 7a.
Through the b, it is inserted into a pipe insertion portion of the offset boom 8, for example, into a tubular body (pipe) 22 continuously provided in the offset boom 8 in the longitudinal direction. Because of this, when the offset boom 8 swings right and left, the hydraulic hose 21
The base boom 7 is liable to bend and rub against the corner 7c of the base boom 7 due to bending deformation or vibration caused by the vibration of the vehicle body, so that it is prevented.

As shown in FIGS. 2 and 3, an inner cover 23 is attached to the distal end of the back surface 7a of the base boom 7, and the outer cover 2 is attached to the distal ends of the left and right side surfaces 7b of the base boom 7.
4 and the outer cover body 24 and the inner cover body 23
The hydraulic hose 2 has a piping inlet 25 and a piping outlet 26 for the hydraulic hose 21 (hydraulic piping).
1 (hydraulic piping) is formed with a piping protection cover means 27 for protecting it from external obstacles. The pipe protection cover means 2
7, a pipe holding means 28 is attached to the pipe passage inlet 25 side.

As shown in FIG. 4, the inner cover body 23 has one left and right side surface 7b on the front end side of the back surface 7a of the base boom 7.
A horizontal plate (installation plate) 30 that is stably mounted on a nearby position
And an upright vertical plate 31 standing upright and integral with the horizontal plate 30 and a downward vertical plate 32 continuous with the horizontal plate 30 and lowered downward. The height of the lower portion 31 is gradually reduced from one side in the longitudinal direction (the inlet side of the pipe) to the other side (the outlet side of the pipe), and the upper end face 31a has an arc shape. A pair of upper nut members 33 for attaching a part of the outer cover body 24 and a pair of side nut members 34 for fixedly attaching the horizontal plate 30 to the base boom 7 are fixed to the upward vertical plate 31. is there. The downward vertical plate 32 is longer than the horizontal plate 30, and the protruding portion 32 a protruding from the horizontal plate 30 is inclined downward.

As shown in FIGS. 5 and 6, the inner cover body 23 is mounted by screwing a bolt 36 from a pair of brackets 35 fixed to the front end of the back surface 7a of the base boom 7 to a pair of side nut members 34. It is. The horizontal plate 30 is placed on the back surface 7a of the base boom 7 and is stably installed. Upward vertical plate 3
Reference numeral 1 denotes a vertical wall of a pipe passage above the back surface 7a of the base boom 7. The downward vertical plate 32 is the corner 7 of the base boom 7.
The lower vertical plate 32 which protrudes from c, curves downward, contacts the left and right side surfaces 7b, and serves as a fretting prevention guard plate which covers the corner 7c of the base boom 7.

The outer cover body 24 has a U-shaped cross section formed by a vertical wall 40, an upper horizontal wall 41, and a lower horizontal wall 42, and is curved in the longitudinal direction. Lateral holes 43 are formed in the lower part and the upper and lower parts on the other side in the longitudinal direction (outlet side of the pipe). A pair of vertical holes 44 are formed on one side in the longitudinal direction of the upper horizontal wall 41, and a cutout 45 is formed on the other side in the longitudinal direction, so that the protruding length is short.

The outer cover body 24 includes a lower horizontal wall 42 and an upper horizontal wall 4.
1, the notch 45 is located close to the left and right side surfaces 7b of the base boom 7, and the lower surface of one longitudinal side of the upper horizontal wall 41 is in contact with the upper end surface 31a of the upward vertical plate 31 of the inner cover body 3,
A bolt 46 is screwed into each of the left and right side surfaces 7b of the base boom 7 from each of the horizontal holes 43, and the bolt 4 is
7 is screwed and attached to the upper nut member 33 of the inner cover body 23.

As a result, the pipe boom inlet 25 which opens over the rear surface 7a of the base boom 7 and the portion projecting laterally beyond the left and right side surfaces 7b, and the base boom from the front end side of the left and right one side surfaces 7b of the base boom 7. 7, a pipe protection cover means 27 having a pipe passage outlet 26 opened to the front side is formed.

As shown in FIG. 7, a bolt (46) on the side of the pipe passage outlet (26) is inserted into a hollow (circular pipe) stay (48) and screwed to one of the left and right side surfaces (7b) of the base boom (7). The outer cover body 24 can be firmly attached so as to support the tightening force of 46 so that the outer cover body 24 is not deformed. The hydraulic hose 21 is inserted between the upper and lower stays 48, and the upper and lower stays 48 form a pipe support means 49. The bolt 46 on the side of the inlet 25 for the pipe is also a stay 48.
Is inserted.

As shown in FIG. 4, the pipe holding means 28 includes a substantially U-shaped holding frame 50 which is open to the left and right side surfaces 7b of the base boom 7 fixed to the upwardly directed vertical plate 31 of the inner cover body 23. And a plurality of pipe holding members 51 fitted into the holding gantry 50, and a semicircular concave portion 52 is formed in the opposed vertical end face 51a of the pipe holding member 51. The concave portion 52 is oblique with respect to the vertical end surface 51 a of the pipe holding member 51. This piping holding member 51
Is made of a flexible material such as rubber, so that no excessive force acts on the hydraulic hose 21 when the hydraulic hose 21 is clamped, and the pipe clamping member 51 can be firmly supported in the holding frame 50. is there.

The pipe holding member 51 is fitted and mounted in the holding frame 50, and the hydraulic hose 21 is fitted into the concave portion 52. The next pipe holding member 51 is fitted into the holding frame 50, and the concave portion 52 is fitted with the hydraulic hose 21. The hydraulic hose 21 is clamped and held by the concave portions 52 of the pair of piping clamping members 51. The outermost pipe clamping member 5 fitted last
1 is supported on the inner surface of the vertical wall 40 of the outer cover body 24 so as not to come off. The upper and lower surfaces of each pipe holding member 51 are supported by the upper and lower horizontal walls 41 and 42 of the outer cover body 24.

As shown in FIG. 3, a part of the pipe holding means 28 is located on the back surface 7a of the base boom 7, and the remaining part protrudes laterally beyond the left and right side surfaces 7b of the base boom 7. As a result, the portion of the hydraulic hose 21 beyond the corner 7c of the base boom 7 is
8, the hydraulic hose 21 does not rub against the corner 7c of the base boom 7 even if the hydraulic hose 21 is bent and deformed. In addition, the tip end of the hydraulic hose 21 is lower than the portion held by the pipe holding means 28, and faces the curved portion 32 b of the downward vertical plate 32 of the inner cover body 23 so as to face the base boom 7.
Does not come into sliding contact with the corner 7c.

Since the holes 52 of the pipe holding members 51 are slanted, the hydraulic hose 21 held between the holes 52 of the pair of pipe holding members 51 is slanted from the back surface 7a of the base boom 7 to the left and right side surfaces 7b. Therefore, the hydraulic hose 21 can be smoothly arranged from the back surface 7a of the base boom 7 to the left and right side surfaces 7b.

Next, the working means of the piping will be described. The inner cover body 23 is attached to the back surface 7a of the base boom 7. The pipe holding member 51 is fitted into the holding frame 50 of the inner cover body 23, the hydraulic hose 21 is fitted into the recess 52, and the next pipe holding member 51 is fitted. This operation is sequentially repeated to hold and hold the plurality of hydraulic hoses 21 with the plurality of pipe holding members 51. The outer cover 24 is attached to protect the hydraulic hose 60. Because of this, the hydraulic hose 21
The piping work is simple.

[Brief description of the drawings]

FIG. 1 is a side view of an offset boom type excavator.

FIG. 2 is a side view of a hydraulic piping portion of a base boom and an offset boom.

FIG. 3 is a rear view of FIG. 2;

FIG. 4 is an exploded perspective view of a pipe protection cover means and a pipe holding means.

FIG. 5 is a side view showing a state where the pipe protection cover means and the pipe holding means are assembled.

6 is a sectional view taken along line AA of FIG.

FIG. 7 is a sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

 Reference Signs List 7 ... Base boom 7a ... Back 7b ... Left and right side 7c ... Corner corner 8 ... Offset boom 20 ... Hydraulic piping 21 ... Hydraulic hose 23 ... Inner cover body 24 ... Outer cover body 25 ... Pipe through inlet 26 ... Pipe through outlet 27 ... Piping protection cover means 28 ... Piping holding means 48 ... Stay 49 ... Piping support means 50 ... Holding stand 51 ... Piping holding member

Claims (3)

[Claims] 1. An offset boom excavator having an offset boom in which an offset boom (8) is connected to the tip of a base boom (7) so as to be swingable left and right. A pipe protection cover means (27) is attached to the back (7) of the base boom (7).
a) A pipe passage inlet (25) opened over a portion protruding laterally from one of the left and right side surfaces (7b) of the base boom (7), and the pipe passage inlet (25) is connected continuously. A pipe passage outlet (26) is formed at the front end of the base boom (7) from the tip side of one of the left and right side surfaces (7b) of the base boom (7). 28), and the tip of a hydraulic pipe disposed along the back surface (7a) of the base boom (7) is disposed from the pipe-through inlet (25) to the pipe-through outlet (26), and the hydraulic pipe is provided. The hydraulic pipe protection mounting structure of the offset boom type excavator, characterized in that the pipe is held by the pipe holding means (28) at the pipe passing inlet (25). 2. An inner cover body (23) attached to a front end of a back surface (7a) of a base boom (7), and one side surface (7) of the inner cover body (23) and the base boom (7).
An outer cover body (24) having a substantially U-shaped cross section removably attached to the tip of (b) serves as a pipe protection cover means (27), and the inner cover body (23) is a base boom (7). A horizontal plate (30) installed on the rear surface of the base boom (7) and a rear plate (7) connected to the horizontal plate (30).
a) an upright vertical plate (31) for mounting the outer cover body, which rises higher than a), and a downward vertical plate (7) that covers the corner (7c) of the base boom (7) continuously with the horizontal plate (30). 32)
The hydraulic pipe protection mounting structure for an offset boom type excavator according to claim 1, wherein the hydraulic pipe protection mounting structure has a shape having: 3. A left and right side surface (7) of a base boom (7) is provided on a side of a pipe passage inlet (25) of the inner cover body (23).
b) A U-shaped holding base (50) opened in the direction is attached, and a plurality of pipe holding members (51) are sequentially fitted into the holding base (50) to hold the hydraulic pipe in a pipe holding means (28). The hydraulic piping protection mounting structure for an offset boom type excavator according to claim 2, wherein the outer cover body (24) is pressed against the piping holding member (51).