JPH10331191A - Hydraulic pressure take-out structure for hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the connection of hydraulic oil pipes and to prevent interference with obstacles, by projecting a pipe connection part for pipe lines for supplying and returning hydraulic oil, forward from a turning frame, and by protecting parts of the pipe lines, which are exposed to the outside, with steel pipe. SOLUTION: A plate member 21 from which a pipe holding part 23 is projected outward, is attached by means of bolts 22 to a walk-through 12 on the right side of a hydraulic shovel, and a pipe connection part 24 formed at its front end with a hydraulic pressure take-out port 25 is fixed to the plate member 21. A hydraulic oil supplying pipe line 27 incorporated therein with selector valve 30 and a hydraulic oil return pipe line 28 are connected to the other end of the pipe connection part 24, and a working attachment is connected thereto with a hydraulic equipment in a turn frame 6. Parts of the hydraulic oil supply and return pipe lines 27, 28, which are exposed outside to the frame 6, are protected by steel pipes 29. With this arrangement, the pipe lines 27, 28 can be easy and surely connected in a compact form with a normal working posture. When the return frame 6 is revolved, a trouble such as flexion or contact with obstacles can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic excavator for connecting a hydraulic excavator to an optional hydraulic working device, and for extracting a main pressure from a hydraulic source mounted on the excavator. The present invention relates to a piping arrangement structure.

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing a hydraulic circuit for exchanging attachments according to an embodiment of a hydraulic shovel disclosed in Japanese Utility Model Application Laid-Open No. 62-72365. In the hydraulic excavator provided with the hydraulic circuit shown in FIG. 6, an oil passage 9 from a switching valve 20 communicates with a head-side oil chamber 8 of a bucket cylinder 7.
A selector valve 10 is installed in the oil passage 9, and a plug 19 is connected to a tip of a branch oil passage 18 branched from the selector valve 10. An oil passage 15 communicating from the switching valve 20 to the rod-side oil chamber 16 of the bucket cylinder 7.
A T-joint 17 is provided, and a plug 14 is connected to the tip of a branch oil passage 13 branched from the T-joint 17. Therefore, when the excavator performs a deep hole digging operation, a backhoe excavation bucket (not shown, but described in Japanese Utility Model Application Laid-Open No. 62-72365), which is usually attached to the tip of the working machine, is used. Remove and replace with a clamshell bucket (described in Japanese Utility Model Application Laid-Open No. 62-72365). By connecting a pipe leading to a rod-side oil chamber of a clam cylinder (not shown) to the plug 14 and a pipe leading to a head-side oil chamber to the plug 19, the hydraulic pump 2
6 can be taken out from the plug 14 or 19 to supply and discharge the clamshell cylinder.

[0003]

The plugs 14 and 19, which are hydraulic outlets in the hydraulic circuit for replacing attachments shown in FIG. It is not described in JP-A-62-72365. Conventionally, however, the hydraulic outlet is disposed in a narrow place inside the vehicle body of the hydraulic shovel, in a portion where the pipe connection operation is difficult on the outer periphery of the vehicle body, or in a boom, arm, or the like connected to the front of the vehicle body. For this reason, the pipe connection operation to the hydraulic outlet has to be performed in an unreasonable working posture, which is not good. Further, piping connected to the hydraulic outlet provided on the outer peripheral portion of the vehicle body or on the boom, arm, or the like is not aligned in one predetermined direction, which may be unsightly. The present invention makes it possible to easily perform a pipe connection operation with respect to the hydraulic outlet in a normal working posture, and furthermore, the arrangement state of the hydraulic outlet has no adverse effect on others and does not impair the aesthetic appearance and is orderly. An object of the present invention is to provide a hydraulic take-out structure capable of connecting pipes.

[0004]

According to the present invention, there is provided a pipe holding portion protruding outside a revolving frame, a pipe connecting portion fixed to the pipe holding portion, and one end of the pipe connecting portion. And a hydraulic oil supply / discharge oil pipe connected to the other end of the pipe connection part, and the pipe connection part is provided so as to protrude forward of the turning frame. In a hydraulic shovel provided with a walk-through (crossover passage) in front of the driving unit on the opposite side in the left-right direction, the pipe connection unit is provided in front of the walk-through, and the pipe holding unit is attached to a turning frame from outside. I did it. In the above case, a plate member is fixed on the walk-through, a projecting portion is formed by projecting a part of the plate member forward from the revolving frame, and the projecting portion constitutes a pipe holding portion. In addition, the hydraulic outlet of the pipe connection portion is arranged in the vertical direction, and the pipe connection portion is attached so as not to substantially protrude above the upper surface of the walk-through. Further, among the hydraulic oil supply / discharge oil pipes connecting the hydraulic connection device inside the piping connection portion and the turning frame, at least a portion exposed to the outside of the turning frame is a steel pipe, and the pressure oil supply / discharge oil pipe is Through an opening provided in the revolving frame to guide a pipe to a work attachment attached to the front of the revolving frame from within the revolving frame to the working attachment, the pipe connection portion and the revolving frame Connected to internal hydraulic equipment.

[0005] In the present invention, a plate member is fixed on a walk-through in front of the driving section, and a pipe holding portion is constituted by a protruding portion in which a part of the plate member protrudes forward from the revolving frame. Since the pipe connection part having the hydraulic outlet of the pressure oil supply / discharge oil pipe is fixed to the part, a compact and firm hydraulic take-out structure can be constructed, The pipe connection operation to the hydraulic outlet can be easily performed. Further, since the pipe connection portion is provided in front of the walk-through, and the pipe holding portion is attached to the turning frame from outside, it is easy to assemble the pipe holding portion to the turning frame when manufacturing a hydraulic shovel. In addition to this, retrofitting can be easily performed on a ready-made hydraulic excavator that does not include the pipe holding unit. Further, since the pipe connection portion is provided in front of the turning frame, it is possible to prevent a trouble that the turning frame is in contact with another obstacle when the turning frame is turned. Further, since the pipe connection portion is attached so as not to substantially protrude above the upper surface of the walk-through, it is possible to prevent a driver or the like from tripping on the pipe connection portion to cause trouble. Further, since the hydraulic outlet of the pipe connection portion is arranged in the up-down direction, for example, in the upward direction, the pipes connected to the pipe connection portion are aligned in a predetermined direction, for example, diagonally above, and the work attachment is It can be arranged neatly. In addition, since at least a portion of the hydraulic oil supply / discharge oil pipe that connects the piping connection portion and the hydraulic equipment inside the turning frame, which is exposed to the outside of the turning frame, is a steel pipe, the opening provided in the turning frame is provided. The part of the pressure oil supply / discharge oil pipe that is exposed to the outside through the portion can exhibit a solid aesthetic appearance without causing bending deformation, and also prevent damage due to contact of the exposed oil pipe. Can be.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator 1 having a hydraulic take-out structure according to one embodiment of the present invention. In the drawing, reference numeral 2 denotes a lower traveling body of the excavator 1;
Is an upper revolving unit connected to the upper part of the lower traveling unit 2, 4 is a driving unit mounted on the upper revolving unit 3, and 5 is a work attachment attached to a front part of the revolving frame 6 of the upper revolving unit 3. . FIG. 2 is a plan view of the excavator 1 in FIG. In the figure, reference numeral 11 denotes a hydraulic oil tank mounted on the upper swing body 3. FIG. 3 is a plan view of a main part of the incision showing the hydraulic pressure take-out structure in the portion A of FIG. In the figure, reference numerals 12 and 12 denote walk-throughs (crossover passages) provided in front of the driving unit 4 (shown in FIG. 1) on the opposite side in the left-right direction, and reference numeral 21 denotes a fixed part (bolt 22) A plate member 23 which has been tightened), a pipe holding portion formed by projecting a part of the plate member 21 forward from the revolving frame 6, a pipe connecting portion 24 fixed to the pipe holding portion 23, 25 is a hydraulic outlet at the tip of the pipe holding part 24, 27 is a pressure oil supply oil pipe among pressure oil supply / discharge oil pipes connected to the other end of the pipe connection part 24, 28 is a return oil discharge oil pipe, 29 is A steel pipe used at a portion of the hydraulic oil supply / discharge oil pipe (referred to as a pressure oil supply oil pipe 27 and a return oil discharge oil pipe 28) exposed to the outside of the inner turning frame 6;
Reference numeral 30 denotes a selector valve provided on the pressure oil supply oil pipe 27. Note that an arrow A indicates a flow direction in which main pressure oil discharged from a hydraulic source (not shown) (not shown) is supplied via a control valve (not shown). Arrow B indicates the direction in which return oil from an optional hydraulic working device (not shown) connected to the pipe connection unit 24 is returned toward the hydraulic oil tank 11.

FIG. 4 is a front view of a main part of the hydraulic take-out structure shown in FIG. In the figure, reference numeral 31 denotes an opening formed in the front part of the turning frame 6. FIG. 5 is a side view of a main part of the hydraulic pressure takeout structure shown in FIG.

Next, the hydraulic take-out structure of this embodiment is shown in FIGS.
Referring to FIG. In the present embodiment, the turning frame 6
, A pipe connecting portion 24 fixed to the pipe holding portion 23, and a hydraulic outlet 25 provided at one end of the pipe connecting portion 24.
And a pressure oil supply / discharge oil pipe (referred to as a pressure oil supply oil pipe 27 and a return oil discharge oil pipe 28 shown in FIG. 3) connected to the other end of the pipe connection section 24. The portion 24 is provided so as to protrude forward of the turning frame 6. Further, in the hydraulic excavator 1 provided with the walk-through 12 (crossover passage shown in FIG. 3) in front of the driving unit 4 (shown in FIG. 1) on the opposite side in the left-right direction, the pipe connection unit 24 is turned forward of the walk-through 12. The pipe holding portion 23 is provided outside the frame 6 and is attached to the turning frame 6 from outside. In the above case, the plate member 21 is fixed on the walk-through 12, a projecting portion is formed by projecting a part of the plate member 21 forward from the revolving frame 6, and the pipe holding portion 23 is formed by the projecting portion. Was configured.
In addition, the hydraulic outlet 25 of the pipe connection portion 24 is arranged in the up-down direction, for example, in the upward direction, and the pipe connection portion 24 does not substantially protrude above the upper surface of the walkthrough 12 (FIGS. 4 and 5). (As shown in the figure). A hydraulic oil supply / discharge oil pipe (pressure oil supply) for connecting the pipe connection portion 24 to a hydraulic device (not shown, such as a control valve, a main pump, or the like, or the hydraulic oil tank 11) inside the turning frame 6. Oil pipe 27 and return oil discharge oil pipe 28), at least a portion exposed to the outside of the turning frame 6 is a steel pipe 29, and the pressure oil supply / discharge oil pipe is located in front of the turning frame 6. To guide the piping to the work attachment attached to the work attachment from inside the swing frame 6 to the work attachment.
Through an opening 31 (shown in FIG. 4) provided in the front part,
The piping connection portion 24 was connected to a hydraulic device inside the turning frame 6.

Next, the operation of the hydraulic pressure take-out structure of the present embodiment will be described. In the present embodiment, the plate member 21 is fixed on the walk-through 12 in front of the driving unit 4 and the plate member 21 is fixed.
Is formed so as to protrude forward from the revolving frame 6, and the projecting portion constitutes a pipe holding section 23, and a hydraulic outlet for a hydraulic oil supply / discharge oil pipe with respect to the pipe holding section 23. Since the pipe connection part 24 with 25 is fixed,
A compact and firm hydraulic take-out structure can be configured, and a worker or a driver can easily perform a pipe connection operation to the hydraulic take-out port 25 in a normal working posture. In addition, the pipe connection part 24 is connected to the walkthrough 12.
Is provided outside the revolving frame 6 in front of the vehicle, and the pipe holding section 23 is attached to the revolving frame 6 from outside.
Not only is it easy to assemble the revolving frame 4 with the revolving frame 6, but also the retrofitting can be easily performed on a ready-made hydraulic excavator that does not include the pipe holding portion (24). Further, since the pipe connection portion 24 is attached so as not to substantially protrude above the upper surface of the walkthrough 12, it is possible to prevent a driver or the like from tripping on the pipe connection portion 24 and causing trouble. . Also, since the hydraulic outlet 25 of the pipe connection portion 24 is arranged in the vertical direction, for example, in the upward direction, the pipe (not shown) connected to the pipe connection portion is aligned in one predetermined direction, for example, diagonally above. Thus, piping can be tied to the work attachment (specifically, a hydraulic work device or the like attached to the work attachment 5 shown in FIGS. 1 and 2). In addition, at least a portion of the hydraulic oil supply / discharge oil pipe (referred to as a pressure oil supply oil pipe 27 and a return oil discharge oil pipe 28 shown in FIG. 3) that is exposed to the outside of the turning frame 6 is a steel pipe 29. The portion of the hydraulic oil supply / discharge oil pipe (referred to as the steel pipe 29 shown in FIGS. 3 to 5) which is exposed to the outside through the opening 31 provided in the revolving frame 6 does not bend and deform. A solid aesthetic can be exhibited.

[0010]

According to the hydraulic take-out structure of the hydraulic excavator of the present invention, the plate member is fixed on the walk-through in front of the operating section,
A pipe holding portion is formed by a projecting portion in which a part of the plate member is protruded forward from the revolving frame, and a pipe connecting portion having a hydraulic outlet of a hydraulic oil supply / discharge oil pipe is fixed to the pipe holding portion. Therefore, a compact and secure hydraulic take-out structure can be configured, and a worker or a driver can easily perform a pipe connection operation to the hydraulic take-out port in a normal working posture. Further, since the pipe connection portion is provided outside the turning frame in front of the walkthrough, and the pipe holding portion is attached to the turning frame from outside, the turning of the pipe holding portion at the time of manufacturing a hydraulic shovel is performed. Not only is it easy to assemble to the frame, but also to retrofitting to a ready-made hydraulic shovel that does not have a pipe holding part. Further, since the pipe connection portion is provided in front of the turning frame, it is possible to prevent a trouble that the turning frame is in contact with another obstacle when the turning frame is turned. Further, since the pipe connection portion is attached so as not to substantially protrude above the upper surface of the walk-through, it is possible to prevent a driver or the like from tripping on the pipe connection portion to cause trouble. Further, since the hydraulic outlet of the pipe connection portion is arranged in the up-down direction, for example, in the upward direction, the pipes connected to the pipe connection portion are aligned in a predetermined direction, for example, diagonally above, and the work attachment is It can be arranged neatly. In addition, since at least a portion of the hydraulic oil supply / discharge oil pipe that connects the piping connection portion and the hydraulic equipment inside the turning frame, which is exposed to the outside of the turning frame, is a steel pipe, the opening provided in the turning frame is provided. The part of the hydraulic oil supply / discharge oil pipe that is exposed to the outside through the part can exhibit a solid aesthetic appearance without causing bending deformation, and also prevent damage due to contact of the exposed oil pipe. Can be. Therefore, in the hydraulic excavator having the hydraulic take-out structure of the present invention, the pipe connection operation to the hydraulic take-out can be easily performed in a normal working posture,
In addition, the external appearance of the hydraulic shovel can be maintained without adversely affecting the arrangement state of the hydraulic outlet.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic excavator provided with a hydraulic take-out structure according to an embodiment of the present invention.

FIG. 2 is a plan view of the hydraulic excavator in FIG.

FIG. 3 is a plan view of an essential part of a cutout showing a hydraulic pressure take-out structure in a portion A of FIG. 2;

FIG. 4 is a front view of a main part of the hydraulic pressure takeout structure shown in FIG.

5 is a main part side view of the hydraulic pressure takeout structure shown in FIG.

FIG. 6 is a diagram showing an attachment replacement hydraulic circuit according to an embodiment of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 3 Upper revolving body 4 Operating part 5 Work attachment 6 Revolving frame 10, 30 Selector valve 11 Hydraulic oil tank 12 Walkthrough 21 Plate member 23 Pipe holding part 24 Pipe connecting part 25 Hydraulic outlet 27 Oil pipe for pressure oil supply 28 Return oil discharge oil pipe 29 Steel pipe 31 Opening

Claims (9)

[Claims] A pipe holding portion provided to protrude outward from the revolving frame; a pipe connecting portion fixed to the pipe holding portion; and a hydraulic outlet provided at one end of the pipe connecting portion. A hydraulic take-out structure for a hydraulic shovel, comprising a hydraulic oil supply / discharge oil pipe connected to the other end of the pipe connection part. 2. The hydraulic take-out structure for a hydraulic shovel according to claim 1, wherein the pipe connection portion is provided so as to protrude forward of a turning frame. 3. The hydraulic excavator according to claim 1, wherein in the hydraulic excavator provided with a walk-through in the front of the driving unit on the opposite side in the left-right direction, the pipe connection unit is provided in front of the walk-through. Extraction structure. 4. The hydraulic take-out structure for a hydraulic shovel according to claim 1, wherein the pipe holding portion is attached to the turning frame from outside. 5. A method in which a plate member is fixed on the walk-through, a projecting portion is formed by projecting a part of the plate member forward from the revolving frame, and the projecting portion constitutes a pipe holding portion. The hydraulic take-out structure for a hydraulic shovel according to claim 3 or 4, wherein: 6. The hydraulic take-out structure for a hydraulic shovel according to claim 1, wherein a hydraulic take-out port of the pipe connection part is arranged in a vertical direction. 7. The hydraulic take-out structure for a hydraulic shovel according to claim 3, wherein the pipe connection portion is attached so as not to substantially protrude above the upper surface of the walk-through. 8. A hydraulic pipe for connecting the piping connection portion and a hydraulic device inside the turning frame, wherein at least a portion of the hydraulic oil supply / discharge oil pipe exposed to the outside of the turning frame is a steel pipe. Item 8. A hydraulic take-out structure for a hydraulic excavator according to any one of Items 1 to 7. 9. The pressure oil supply / discharge oil pipe has an opening provided in the revolving frame for guiding a pipe to a work attachment attached in front of the revolving frame from the inside of the revolving frame to the work attachment. The hydraulic take-out structure for a hydraulic shovel according to any one of claims 1 to 8, wherein the piping connection part is connected to a hydraulic device inside the turning frame through a part.