JPH0577346U - Hydraulic excavator - Google Patents

Abstract

(57) [Summary] [Purpose] The slack part of each supply / discharge pipe located between the boom and arm prevents the arm from collapsing when the arm is tilted down against the boom, and wear of each supply / discharge pipe is prevented. ， Prevent damage. [Structure] A pipe guide 21 for guiding the slack portion 12A of each supply / discharge pipe 12 is provided at the tip 3A of the boom 3. The piping guide 21 includes four vertical support shafts 22, four horizontal support shafts 23 located at the front and rear and vertically spaced apart from each other on the left and right vertical support shafts 22, 22, and front and rear. It is composed of two auxiliary support shafts provided between the rear vertical support shafts 22 and 22, and eight rollers 25 rotatably provided on the respective support shafts 22 and 23. A quadrangle range surrounded by each roller 25 becomes a pipe movement range 26, and the slack portion 12A of each supply / discharge pipe 12 is arranged in the pipe movement range 26. Then, each slack portion 12B is prevented from falling down, and each roller 25 reduces wear of the slack portion 12A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic excavator that prevents a bending portion of a supply / discharge pipe located between a boom and an arm of a work device from falling.

[0002]

[Prior Art]

 A hydraulic excavator provided with a bottom dump type loader bucket as a conventional technique will be described with reference to FIGS.

In the figure, reference numeral 1 denotes an upper revolving structure that constitutes a main body of a working machine together with a lower traveling body. A supporting bracket 1A is formed at a front portion of the upper revolving structure 1, and a working device 2 is provided on the supporting bracket 1A. Is provided so that it can be raised and lowered.

Reference numeral 3 denotes a boom that is pin-connected to the support bracket 1 A, and a connecting bracket 4 is fixed to the front end side of the boom 3. Reference numeral 5 denotes an arm that is pin-connected to the tip end side of the boom 3 via the connecting bracket 4.

Reference numeral 6 denotes a bottom dump type loader bucket (hereinafter, referred to as “bucket 6”) as a working tool which is pin-coupled to the tip end side of the arm 5 and is adapted to store soil and the like therein. The bucket 6 is generally composed of a rear bucket 6A, a front bucket 6B, and a pair of bottom dump cylinders (neither shown) mounted in the rear bucket 6A.

Reference numeral 7 is a boom cylinder (only one is shown) pin-connected between the support bracket 1 A and the connecting bracket 4, 8 is a pair of arm cylinders pin-connected between the boom 3 and the arm 5, and 9 is a pair. Similarly, a level cylinder 10 is pin-connected between the boom 3 and the arm 5, and 10 is a pair of bucket cylinders (only one is shown) pin-connected to the connecting bracket 4 and the arm mounting bracket 11 of the rear bucket 6A. ..

The working device 2 according to the prior art is configured to include the boom 3, the arm 5, the bucket 6, the boom cylinder 7, the arm cylinder 8, the level cylinder 9, and the bucket cylinder 10.

[0012] Reference numerals 12, 12, ... denote supply and discharge pipes, and each of the supply and discharge pipes 12 is held by a fixture 13, 13, ... so as to extend in the length direction of the working device 2, and Pressure oil from a hydraulic pump arranged in the machine room is supplied to and discharged from each cylinder 7, 8, 10 and the like. The portion of each supply / discharge pipe 12 located between the boom 3 and the arm 5 is A slack portion 12A is bent on the tip portion 3A of the boom 3 in a convex curved shape.

Further, in the vicinity of the slack portion 12A of each of the supply and discharge pipes 12, as shown in FIG. At the center of the portion 12A in the lengthwise direction, clamps 14 and 14 clamp the supply / discharge pipes 12 so that four pipes are bundled.

In the hydraulic excavator configured as described above, when excavating work such as earth and sand, the boom cylinder 7 and the arm cylinder 8 raise and lower the boom 3 and the arm 5, and the bucket cylinder 10 rotates the bucket 6. Then excavate the earth and sand. Further, when the earth and sand contained in the bucket 6 is transferred to a truck or the like, the bottom dump cylinder is used to open the front bucket 6B with respect to the rear bucket 6A.

[0011]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional technique, each supply / discharge pipe 12 arranged between the boom 3 and the arm 5 of the working device 2 is bent in a convex curve shape toward the upper surface side by the slack portion 12A. However, when the arm cylinder 8 is contracted to rotate the arm and the bucket 6 is moved to the lower side during excavation work as shown in FIG. 6, the clamp 14 as shown by the arrow in FIG. The supply pipes 12 bundled with each other are tilted in the left and right directions due to differences in diameter, weight, displacement in the bending direction, and the like. Therefore, there is a problem that the slack portion 12A of the supply / discharge pipe 12 comes into contact with the connecting bracket 4, the boom 3 or the arm 5 and the like, causing wear and damage to the supply / discharge pipe 12.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a hydraulic excavator capable of preventing the slack portion of the supply / discharge pipe from falling.

[0013]

[Means for Solving the Problems]

 The feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that the slack part of each supply / discharge pipe is provided at the tip side of the boom of the working device when the arm is raised and lowered with respect to the boom. There is a piping guide that regulates the left and right fall.

Further, it is desirable that a roller is rotatably provided on the pipe guide at a portion that comes into contact with the slack portion of each of the supply and discharge pipes.

[0015]

[Action]

 With the above configuration, even when the arm is raised and lowered with respect to the boom, the slack of each supply / discharge pipe is restricted by the pipe guide, so that each slack is prevented from falling in the left and right directions.

[0016]

【Example】

 An embodiment 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, reference numeral 21 denotes a pair of piping guides (see FIG. 3) according to the present embodiment, which are formed on the left and right sides of the tip portion 3A of the boom 3, and the piping guide 21 has a base end as shown in FIG. The four sides are fixed to the tip portion 3A of the boom by means such as welding, the tip side extends outward, and two of them are bent portions 22A that are bent to spread to the outside of the boom 3. , And the vertical support shafts 22, 22 of each of the vertical support shafts 22 located on the left and right sides of the vertical support shafts 22, respectively, and are spaced apart in the upward and downward directions. Four cylindrical horizontal support shafts 23, 23, ..., and two auxiliary support shafts 22 provided between the vertical support shafts 22, 22 positioned in the front and rear directions, respectively. Support shafts 24, 24, the vertical support shafts 22 and the horizontal support shafts 2 3 is composed of eight rollers 25, 25, ...

As shown in FIGS. 3 and 4, each supply / discharge pipe 12 is a portion surrounded by the front and rear support shafts 22, 23, that is, a quadrangular pipe movement provided with rollers 25. It is arranged to be arranged within the range 26.

The hydraulic excavator according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the conventional art.

Next, the operation of the pipe guide 21 will be described with reference to FIG.

First, when the arm cylinder 8 is contracted to lower the arm 5 and the bucket 6 is moved to the lower side, the slack portion 12A of each supply / discharge pipe 12 moves in the direction of arrow A to try to fall down. To do. However, since each slack portion 12A is within the pipe movement range 26 of the pipe guide 21 and the movement of each slack portion 12A in the left and right directions is restricted by the left and right vertical support shafts 22, respectively. It is possible to surely prevent falling in the direction A. Further, at this time, the rollers 25 provided on the vertical support shafts 22 rotate with the contact of the slack portions 12A, so that the wear of the supply / discharge pipes 12 can be effectively reduced.

On the other hand, when the arm cylinder 8 is extended to raise the arm 5 and the bucket 6 is moved to the upper side, the slack portion 12A of each supply / discharge pipe 12 tries to move in the arrow B direction. However, each slack portion 12A is within the pipe movement range 26 of the pipe guide 21, and the movement of each slack portion 12A in the upper and lower directions is restricted by the upper and lower horizontal support shafts 23, 23. Movement in the direction B can be restricted. Further, at this time, the roller 25 provided on each horizontal support shaft 23 rotates with the contact of each slack portion 12A, so that the wear of each slack portion 12A can be effectively reduced.

As described above, even if the slack portion 12A of each supply / discharge pipe 12 moves in any direction due to the upward / downward movement of the arm 5, it does not fall out of the pipe movement range 26 of the pipe guide 21. Further, since the portion in contact with each slack portion 12A is received by rotating the roller 25 provided on each support shaft 22, 23, it is possible to reduce wear and damage of each slack portion 12A.

Thus, in the hydraulic excavator of the present embodiment, the arm 5 is boomed at the time of excavation work by providing the tip 3A of the boom 3 with the pipe guide 21 for guiding the slack 12A of each supply / discharge pipe 12. It is possible to prevent the slack portions 12B of the supply / discharge pipes 12 from collapsing when the slack portions 12A of the supply / discharge pipes 12 are lifted up and down, and to prevent the slack portions 12A from contacting the connecting bracket 4 and the boom 3 or the arm 5. Make sure to prevent. Further, by making a rotatable roller 25 at the portion where the slack portion 12A comes into contact with the pipe guide 21, the wear of each slack portion 12A can be effectively reduced, and the life of each supply / discharge pipe 12 can be ensured. Can be extended to.

Although each side of the pipe moving range 26 of the pipe guide 21 of the above-described embodiment is surrounded by the rollers 25, the present invention is not limited to this, and the vertical support shafts 22 and It may be configured by the horizontal support shaft 23.

The shape of the pipe movement range 26 of the pipe guide 21 is not limited to a quadrangle, and may be a square or a triangle, as long as the slack portion 12B of each supply / discharge pipe 12 can be regulated with a certain degree of freedom. Good.

Further, in the above-described embodiment, the case where the bottom dump type roller bucket is used as the work tool has been described, but the present invention is not limited to this, and it goes without saying that a backhoe bucket may be used.

[0028]

[Effect of the device]

 As described above in detail, according to the present invention, the arm is provided with respect to the boom by providing a pipe guide on the tip end side of the boom for restricting the slack part of each supply / discharge pipe located between the boom and the arm. The slack of each supply / exhaust pipe can be securely regulated from falling down when it is lifted and the contact of the slack with the boom, arm, etc. can be reliably prevented, and the wear / damage of each supply / exhaust pipe is ensured. Can be prevented. Then, the life of each supply / discharge pipe can be effectively extended.

Further, by providing the pipe guide with a roller rotatably at a portion in contact with the slack portion of each supply / discharge pipe, wear of each supply / discharge pipe when the slack portion comes into contact can be reliably reduced, As a result, the life of each supply / discharge pipe can be extended.

[Brief description of drawings]

FIG. 1 is a side view showing a working device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a pipe guide according to the present embodiment.

FIG. 3 is an enlarged top view of a boom tip end portion as viewed in the direction of arrows III-III in FIG.

FIG. 4 is an enlarged cross-sectional view of the pipe guide as seen from the direction of arrows IV-IV in FIG.

FIG. 5 is a side view showing a work device according to the prior art.

FIG. 6 is a side view showing a state in which the bucket of the work device according to the conventional technique is lowered.

FIG. 7 is an enlarged top view of the boom tip end portion as viewed in the direction of arrow VII-VII in FIG.

[Explanation of symbols]

 1 Upper revolving structure (working device main body) 1A Support bracket 2 Working device 3 Boom 5 Arm 6 Bucket (working tool) 7 Boom cylinder 8 Arm cylinder 10 Bucket cylinder 12 Supply / discharge pipe 12A Slack part 21 Piping guide 22 Vertical support shaft 23 Horizontal Support shaft 24 Auxiliary support shaft 25 Roller 26 Pipe movement range

Claims (2)

[Scope of utility model registration request] 1. A working machine main body, a working device provided on the working machine main body so as to be capable of being lifted and lowered, and including a boom, an arm, and a working tool operated by each hydraulic cylinder, and a hydraulic cylinder of the working device. A hydraulic excavator including a plurality of supply / drain pipes that extend in the lengthwise direction of the working device and have a slackened portion that bends between the boom and the arm of the working device in a convex curved shape to supply and discharge oil. In the above, a pipe guide is provided on the tip end side of the boom of the working device for restricting the slack of the supply / discharge pipes from falling to the left or right when the arm is raised or lowered with respect to the boom. Hydraulic excavator characterized by. 2. The hydraulic excavator according to claim 1, wherein the pipe guide is provided with a roller rotatably provided at a portion in contact with a slack portion of each of the supply and discharge pipes.