JP4558540B2 - Clamp device for construction machine hose - Google Patents

Description

  The present invention relates to a hose clamping device for a construction machine, and more particularly to a technique for protecting a plurality of hydraulic hoses extending from an upper swing body to a front attachment in a large hydraulic excavator or the like.

  In a hydraulic excavator, a front attachment consisting of an arm and a bucket is connected to an upper swing body so as to be rotatable in the vertical direction, and the front attachment is provided with a plurality of hydraulic cylinders (actuators) for operating the arm and the bucket. ing. In order to supply pressure to the plurality of hydraulic cylinders, a plurality of hydraulic hoses extend from the upper swing body to the front attachment.

By the way, at the connecting part of the front attachment, there is a risk that the hydraulic hose may deteriorate due to repeated stress accompanying the rotation of the front attachment, resulting in a short service life. To prevent the occurrence of such repeated stress, the hydraulic hose is flexible. The hydraulic hose is configured by a member and is provided with a curved slack portion.
When the slack portion is provided in the hydraulic hose in this way, the larger the number of hydraulic hoses, the more the hydraulic hoses tend to be united. Usually, the plurality of hydraulic hoses are bundled using a clamp.

On the other hand, if a slack portion is provided in the hydraulic hose, the slack portion may be greatly bent due to the weight of the hydraulic hose and hang down, and the hydraulic hose may be damaged and deteriorated due to interference with the upper rotating body. When there are a plurality of hoses, there is a problem that when the damage is biased, the replacement time varies for each hydraulic hose, and the maintainability is poor.
Therefore, for example, a buffer plate (rubber, etc.) is affixed to the part where the hydraulic hose on the upper revolving unit side interferes, and for example, a spring-like strip is provided along the hydraulic hose to suppress bending of the hydraulic hose. A technique for supporting a hydraulic hose has been developed (see Patent Document 1, etc.).
JP 10-280474 A

However, when the cushioning material is affixed to the upper swing body side as described above, the position where the hydraulic hose interferes changes due to secular change, so the cushioning material must be affixed over a wide range. In addition, there is a problem that the cushioning material is easily peeled off or deteriorated because the operator is often on the road.
Further, as disclosed in Patent Document 1, when a strip is provided along the hydraulic hose, particularly when the number of hydraulic hoses is large, such as a large hydraulic excavator, the belt has a relatively high strength. It is necessary to use a plate, which leads to cost increase and is not preferable.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a hose clamp device for a construction machine suitable for preventing deterioration of a plurality of hoses extending from a main body to a front attachment. There is.

In order to achieve the above object, in the hose clamping device for a construction machine according to claim 1, the working medium is fed from the main body to the actuator of a front attachment that is pivotally connected to the main body in the vertical direction. A plurality of hoses provided extending to the front attachment and having a curved slack portion at a connecting portion between the main body and the front attachment, and a position approaching the main body when the slack portion of the slack portion is bent provided, and a clamp for bundling the plurality of hoses, the clamp, one or more stoppers for preventing by contacting the interference between the body and the hose facing the body on an upper surface of the main body An interference preventing member is provided.

That is, a plurality of hoses are bundled by a clamp at a position approaching the main body when the slack portion of the slack portion is bent, and the clamp has an interference preventing member (for example, a rubber material) including a stopper on the main body side. Is provided. Thereby, interference with a hose and a main body is prevented when a stopper contact | abuts on the upper surface of a main body .
Preferably, the position of the clamp is adjustable so that the position of the interference preventing member can be adjusted.

According to a second aspect of the present invention, there is provided a hose clamping device for a construction machine according to the first aspect, wherein the working medium is pressure oil, and the hose is a hydraulic hose that supplies the pressure oil.
In the construction machine hose clamping device according to claim 3, the interference prevention member according to claim 1 or 2 is detachable.

According to the clamp device for a hose of a construction machine according to claim 1, a plurality of hoses are bundled by a clamp at a position approaching the main body when the slack portion of the slack portion is bent, Since an interference prevention member consisting of multiple stoppers is provided, the interference between the hose and the main body can be reliably prevented by making contact with the upper surface of the main body using an existing clamp, and a simple configuration Thus, deterioration of the hose can be prevented and the life of the hose can be extended.

Further, since the hoses are not biased and deteriorated, a plurality of hoses can be exchanged at a time, and the maintainability can be improved.
According to the hose clamping device for a construction machine according to claim 2, since the hose is a hydraulic hose that supplies pressure oil, deterioration of the hydraulic hose frequently used in the construction machine can be prevented, and the reliability of the construction machine is improved. be able to.

  According to the clamp device for a hose of a construction machine according to claim 3, the interference preventing member is detachable. Therefore, the interference preventing member can be easily replaced, and maintenance can be improved.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a hose clamping device for a construction machine according to the present invention will be described with reference to the drawings.
FIG. 1 is an overall view of a hydraulic excavator according to the present invention. Hereinafter, a case where the construction machine is a hydraulic excavator will be described as an example.
In the hydraulic excavator, an upper swing body (main body) 2 is placed on a crawler 1 which is a lower traveling body so as to be rotatable with respect to the crawler 1, and is rotated in a vertical direction around a rotation shaft 3 at a front portion of the upper swing body 2. The front attachment 4 is configured to be movable.

The front attachment 4 includes a boom 6, an arm 8, and a bucket 10. The base end of the boom 6 is rotatably connected to the upper swing body 2, and the base end of the arm 8 rotates at the tip of the boom 6. The bucket 10 is rotatably connected to the tip of the arm 8.
A hydraulic cylinder 12 is provided between the front part of the upper swing body 2 and the tip of the boom 6, a hydraulic cylinder 14 is provided between the boom 6 and the arm 8, and the tip of the boom 6 is further provided. A hydraulic cylinder 16 is provided between the bucket 10 and the bucket 10. Accordingly, the boom 6, the arm 8, and the bucket 10 are operated by the expansion and contraction of the hydraulic cylinders 12, 14, and 16 (for example, indicated by a two-dot chain line), and excavation and the like can be performed by the bucket 10.

  The hydraulic cylinders (actuators) 12, 14, 16 are configured to be supplied with pressure oil (working medium) via a plurality of hydraulic hoses 20 from a hydraulic unit (not shown) provided in the upper swing body 2. ing. Specifically, the plurality of hydraulic hoses 20 have flexibility, and as shown in the figure, a curved slack portion 22 is formed at the connecting portion between the upper swing body 2 and the front attachment 4, that is, at the rotating shaft 3 portion. Have been arranged to form. Thereby, even if the front attachment 4 rotates, the degree of bending of the hydraulic hose 20 is reduced, and it is difficult for the hydraulic hose 20 to repeatedly generate stress, and the deterioration of the hydraulic hose 20 is prevented.

In the slack portion 22, the plurality of hydraulic hoses 20 are bundled by a clamp 30 with a stopper and a clamp 40.
The clamp 30 with a stopper is provided at a position of the slack portion 22 that approaches the upper swing body 2 when the slack portion 22 is bent downward, that is, toward the upper swing body 2 side. The clamp 40 is provided at an arbitrary position.

2 is an enlarged view showing slack portions 22 of a plurality of hydraulic hoses 20 according to the present invention, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. 4 is an arrow in FIG. It is the figure seen from the view B direction, and the detail of the clamp 30 with a stopper is demonstrated below based on FIGS.
As shown in FIG. 3, the clamp 30 has a plurality of hydraulic hoses 20 (two or four in this case) with respect to a long plate-like upper clamp 31 extending across all of the plurality of hydraulic hoses 20. , 38 through the lower clamp 32 (32a to 32h) and fastened with screws (or bolts) 34. Note that the basic configuration of the clamp 30 is the same as that of the existing clamp, and thus the detailed description thereof is omitted. However, the same applies to the clamp 40. Thereby, also in the slack part 22, the some hydraulic hose 20 does not become disjoint, respectively, but is maintained in the collective state. Although the lower clamp 32 is divided into a plurality of parts here, the lower clamp 32 may be a long plate extending across all of the plurality of hydraulic hoses 20 similarly to the upper clamp 31.

2 to 4, a pair of stoppers (interference prevention members) 50 are attached to the clamp 30 so as to face the upper swing body 2.
Specifically, the stopper 50 is configured such that a bracket 56 having a U-shaped cross section is joined to each of the lower clamp 32 b and the lower clamp 32 g, and the stopper main body 52 is attached to the bracket 56. The stopper main body 52 is a soft member made of, for example, a resin material or a rubber material, but may be a hard member such as a metal material. Further, for example, a screw (or bolt) 54 is erected on the stopper body 52, and the stopper body 52 is detachably attached to the bracket 56 by screwing the screw 54 to the bracket 56.

Here, the stopper 50 is provided at two locations of the lower clamp 32b and the lower clamp 32g. However, when the stopper main body 52 is long along the clamp 30, it may be provided at only one location. You may make it provide in more places.
In this way, when the clamp 30 is provided with the stopper 50, when the front attachment 4 is rotated upward, the slack portion 22 is caused by its own weight of the hydraulic hose 20 due to, for example, secular change as shown by a broken line in FIG. 3, the stopper main body 52 of the stopper 50 contacts the upper surface of the upper swing body 2 before the hydraulic hose 20 contacts the upper surface of the upper swing body 2 (FIGS. 3 and 4). See), the interference between the hydraulic hose 20 and the upper swing body 2 is reliably prevented. Thereby, the hydraulic hose 20 can be prevented from being damaged by the interference with the upper swing body 2, and deterioration of the hydraulic hose 20 can be satisfactorily prevented. Therefore, the reliability of the excavator as a construction machine can be improved.

In particular, since the clamp 30 with a stopper is configured such that the stopper 50 is provided on an existing clamp, it is possible to prevent deterioration of the hydraulic hose 20 with a simple configuration at a relatively low cost.
In addition, since a part of the plurality of hydraulic hoses 20 is not biased and deteriorated unlike the prior art, the replacement time does not vary for each hydraulic hose 20, and when the hydraulic hose 20 reaches the end of its life, the plurality of hydraulic hoses 20 All of 20 can be exchanged at a time, and maintenance can be improved.

Further, since the stopper main body 52 is detachable, the stopper main body 52 can be easily replaced even when the stopper main body 52 is worn, and maintenance can be improved.
The position of the hydraulic hose 20 that hangs down by its own weight, that is, the position at which the slack portion 22 of the hydraulic hose 20 is closest to the upper swing body 2 may change due to secular change, but even in such a case, This can be easily handled by adjusting the position of the clamp 30.

This is the end of the description of the embodiment of the present invention, but the embodiment is not limited to the above.
For example, in the above embodiment, the case where the construction machine is a hydraulic excavator has been described as an example. However, the present invention is not limited to the hydraulic excavator, and the present invention is not limited to the hydraulic excavator and may be any construction machine having a rotating front attachment such as a backhoe. It can be suitably applied.
Further, here, the hydraulic hose 20 that supplies pressure oil has been described as an example. However, the hose is not limited to the hydraulic hose 20 and has flexibility and supplies a working medium that operates the actuator. Any hose may be used regardless of the material.

1 is an overall view of a hydraulic excavator according to the present invention. It is an enlarged view which shows the slack part of the some hydraulic hose which concerns on this invention. It is sectional drawing which follows the AA line of FIG. 2, Comprising: It is a figure which shows the clamp which concerns on this invention. It is the figure seen from the arrow B direction of FIG.

Explanation of symbols

2 Upper swing body (main body)
4 Front attachment 20 Hydraulic hose 22 Slack part 30 Clamp with stopper 50 Stopper (interference prevention member)
52 Stopper body

Claims (3)

It is provided extending from the main body to the front attachment so as to feed a working medium to an actuator of a front attachment that is connected to the main body so as to be rotatable in the vertical direction, and is curved at a connecting portion between the main body and the front attachment. A plurality of hoses having slack portions;
A clamp that is provided at a position approaching the main body when the slack portion of the slack portion is bent, and bundles the plurality of hoses;
The clamp is provided with an interference preventing member including one or a plurality of stoppers facing the main body to prevent interference between the hose and the main body by contacting the upper surface of the main body. Clamp device for construction machine hose.   2. The clamp device for a hose of a construction machine according to claim 1, wherein the working medium is pressure oil, and the hose is a hydraulic hose that feeds the pressure oil.   The hose clamping device for a construction machine according to claim 1 or 2, wherein the interference preventing member is detachable.

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