JP6094129B2 - hose - Google Patents

Description

  The present invention relates to a hose.

In order to visually recognize the damage of the hose, it has been proposed to interpose a colored rubber sheet layer between the outermost cover rubber layer of the hose and the reinforcing layer laminated inside the cover rubber layer (patent) Reference 1).
In addition, it has been proposed to embed microcapsules in which a colorant or a fluorescent agent is sealed in the hose (see Patent Document 2).
In these hoses, when the outside of the hose is damaged, the colored rubber sheet layer is exposed, or the microcapsule breaks and the colorant or fluorescent agent oozes out of the hose, thereby causing damage to the hose. Visible.

Japanese Utility Model Publication No. 7-29388 JP 2009-210085 A

However, in the former hose, it is difficult to visually recognize the colored rubber sheet layer unless the hose is damaged to some extent.
In the latter hose, since the size of the microcapsule is at most about several μm to several hundred μm, the amount of the colorant and the fluorescent agent enclosed in the microcapsule is small. Therefore, when the hose is damaged, there is a concern that the amount of the colorant or the fluorescent agent that oozes out from the hose is not so large that the damage cannot be visually recognized.
Therefore, in the prior art, there is room for improvement in reliably recognizing that the hose has been damaged.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hose that is advantageous in reliably recognizing that the hose has been damaged.

In order to achieve the above object, the present invention provides a rubber tube layer, one or more reinforcing layers laminated on the outside of the rubber tube layer, and an outer reinforcing layer disposed on the outermost side of the reinforcing layers. A hose comprising a cover rubber layer laminated on the outside, and an elastically deformable resin tube enclosing a colorant or a fluorescent agent is wound between the outer reinforcing layer and the cover rubber layer It is characterized by that.

According to the present invention, when the damage reaches the cover rubber layer and the outer reinforcing layer, and the resin tube portion at the damage site is torn, the colorant or the fluorescent agent exudes from the resin tube and leaks to the outer surface of the cover rubber layer. .
Therefore, it is advantageous to easily and reliably visually recognize that the hose has been damaged based on the leaked colorant or fluorescent agent.

It is a perspective view which cuts and shows partly hose 10A concerning a 1st embodiment. It is a perspective view which partially cuts and shows hose 10B which concerns on 2nd Embodiment. It is explanatory drawing which shows the case where hose 10A is used for a construction machine.

(First embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a case where the hose is a hydraulic hose (high pressure hose) for construction machinery will be described.
As shown in FIG. 1, the hose 10A includes a rubber tube layer 12, first to fourth reinforcing layers 14A to 14D, first to third intermediate rubber layers 16A to 16C, a cover rubber layer 18, And a resin tube 20.

The rubber tube layer 12 forms a flow path through which hydraulic oil (fluid) flows.
14 A of 1st reinforcement layers are laminated | stacked on the outer side of the rubber tube layer 12, and are comprised by winding a steel wire spirally on the outer side of the rubber tube layer 12. As shown in FIG.
The first intermediate rubber layer 16A is laminated on the outside of the first reinforcing layer 14A.

The second reinforcing layer 14B is laminated outside the first intermediate rubber layer 16A, and a steel wire is wound around the first intermediate rubber layer 16A in a spiral shape in the opposite direction to the first reinforcing layer 14A. Is made up of.
The second intermediate rubber layer 16B is laminated on the outside of the second reinforcing layer 14B.

The third reinforcing layer 14C is laminated outside the second intermediate rubber layer 16B, and a steel wire is wound outside the second intermediate rubber layer 16B in a spiral shape in the opposite direction to the second reinforcing layer 14B. Is made up of.
The third intermediate rubber layer 16C is laminated on the outside of the third reinforcing layer 14C.

The fourth reinforcing layer 14D is laminated outside the third intermediate rubber layer 16C, and a steel wire is wound outside the third intermediate rubber layer 16C in a spiral shape in the opposite direction to the third reinforcing layer 14C. Is made up of.
The cover rubber layer 18 is laminated on the outer side of the fourth reinforcing layer 14D which is an outer reinforcing layer disposed on the outermost side.

The resin tube 20 is wound between the fourth reinforcing layer 14D and the cover rubber layer 18, and a predetermined amount of colorant or fluorescent agent is sealed therein.
As shown in FIG. 1, the resin tube 20 is wound around the fourth reinforcing layer 14D in a spiral shape in the opposite direction to the steel wire of the fourth reinforcing layer 14D.
The resin tube 20 is wound and attached to the fourth reinforcing layer 14D via the rubber of the third intermediate rubber layer 16C and the cover rubber layer 18 in the vulcanization step in the manufacturing process of the hose 10A.
The resin tube 20 can be elastically deformed, and the synthetic resin material constituting the resin tube 20 can be easily broken when a damage to the cover rubber layer 18 and the fourth reinforcing layer 14D occurs, and the hose 10A. Those that can be deformed following the deformation of are preferred.
As such a synthetic resin material, various conventionally known synthetic resin materials such as polypropylene (PP), polyester (PET), polyethylene (PE), polytetrafluoroethylene (PTFE), and polyamide (PA) can be used.

As the resin tube 20 has a larger inner diameter, it is advantageous in securing a larger volume of the colorant or fluorescent agent to be enclosed. However, as the outer diameter of the resin tube 20 increases, the outer diameter of the hose 10A increases. Therefore, it is preferable to be within the range exemplified below.
The inner diameter of the resin tube 20 is preferably 0.1 mm to 1.0 mm, for example.
The outer diameter of the resin tube 20 is preferably 0.3 to 0.4 mm if the inner diameter is 0.1 mm, for example, and preferably 1.4 to 1.6 mm if the inner diameter is 1.0 mm.

Moreover, it is preferable that the braid density of the resin tube 20 is 50 to 90% in order to ensure that the resin tube 20 is broken when the hose 10A is damaged and to ensure the braiding workability.
If the braid density is less than 50%, there is a possibility that the resin tube 20 will not be destroyed when the hose 10A is damaged, and if the braid density exceeds 90%, the braiding workability decreases.

From the viewpoint of ensuring visibility, the colorant and the fluorescent agent preferably have a hue, lightness, or saturation that is distinguishable with respect to the cover rubber layer 18.
For example, when the cover rubber layer 18 is black, it is advantageous for improving the visibility that the hues of the colorant and the fluorescent agent are white, yellow, orange, and pink.
Further, the main component of the colorant and the fluorescent agent is preferably a synthetic resin emulsion for the reason described below.
That is, when the hose 10A is damaged and the reinforcing layer is exposed, the synthetic resin emulsion which is the main component of the colorant and the fluorescent agent leaked from the resin tube 20 at the damaged portion is exposed to the air as if the quick-drying adhesive Thus, short-term protection of the exposed reinforcing layer can be achieved.
If the hose is damaged and left with the reinforcing layer exposed, there is a concern that the steel wire will eventually rust and the strength will be reduced, leading to hose damage.
On the other hand, when a synthetic resin emulsion is used as the main component of the colorant and the fluorescent agent as in the present embodiment, the synthetic resin emulsion is cured in a state in which the steel wire of the reinforcing layer is covered, and therefore a limited period of time. However, it is advantageous for protecting the reinforcing layer (suppressing rust of the steel wire).

Next, the effect of the hose 10A of this Embodiment is demonstrated.
Assume that the hose 10 </ b> A connected to the construction machine and used is damaged by, for example, hitting a structure.
When the damage is caused by the cover rubber layer 18 and the fourth reinforcing layer 14D, and the resin tube 20 at the damaged part is torn, the colorant or the fluorescent agent oozes out from the resin tube 20 and leaks to the outer surface of the cover rubber layer 18. To do.
Since the amount of the colorant or the fluorescent agent leaking to the outer surface of the cover rubber layer 18 is enclosed in the resin tube 20, it is much larger than the amount enclosed in the capsule of the conventional example, and the cover rubber layer 18. The area of the colorant or the fluorescent agent that leaks to the outer surface is significantly larger than the area of the colored rubber sheet layer exposed from the cut line in the conventional example.
Therefore, it is advantageous for easily and surely visualizing that the hose 10A is damaged based on the leaked colorant or fluorescent agent.

Further, the colorant or the fluorescent agent that leaks to the outer surface of the cover rubber layer 18 is encapsulated in the resin tube 20 in a predetermined amount of the colorant or the fluorescent agent, so that the colorant or the fluorescent agent leaks over a wide range and increases over time. This is more advantageous for easily and surely visualizing the occurrence of the trauma.
In addition, when the hose 10A is bent by the operation of the construction machine, the coloring agent or the fluorescent agent in the resin tube 20 is pushed out by the bending operation of the hose 10A, oozes over a wide range, and the hose 10A is damaged. It is more advantageous to easily and surely view the image.
In addition, when hydraulic oil flows through the rubber tube layer 12 of the hose 10A as in the embodiment, a pressure is applied to the resin tube 20 outward in the radial direction of the hose 10A. The colorant or the fluorescent agent is pushed out and oozes out over a wide area, and it is more advantageous to easily and surely recognize that the hose 10A is damaged.

In the present embodiment, the resin tube 20 is spirally wound around the outer reinforcing layer.
Therefore, the resin tube 20 easily deforms following the bending of the hose 10A, which is advantageous in securing the flexibility of the hose 10A.
Moreover, since the resin tube 20 should just be wound spirally similarly to the steel wire which comprises each reinforcement layer, the resin tube 20 can be wound using the existing braiding machine, and the increase in the cost of manufacturing equipment can be carried out. This is also advantageous in terms of suppression.
In addition, when damage is found based on the leaked colorant or fluorescent agent, by stopping further use of the hose 10A, the steel wire of each reinforcing layer rusts and deteriorates, and the strength of the hose 10A is reduced. Or a situation in which the trauma reaches the rubber tube layer 12 and the hydraulic oil leaks can be avoided.

FIG. 3 is an explanatory diagram when the hose 10A is used in a construction machine.
A pile driving machine 54 as a construction machine is suspended from an arm 52 of the crane 50, and hydraulic oil is supplied to the pile driving machine 54 from a hydraulic supply source 56 via a hose 10A. positioned.
Thus, when the hose 10A located at a high place is damaged, the colorant or the fluorescent agent oozes out from the resin tube 20 and leaks to a wide area on the outer surface of the cover rubber layer 18, and thus from the ground. In addition, the colorant P or the fluorescent agent P leaked to the outer surface of the hose 10A can be easily seen, and the damage to the hose 10A located at a high place can be easily and reliably seen from the ground.

(Second Embodiment)
Next, a second embodiment will be described. In the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 2, the second embodiment is different from the first embodiment in that the resin tube 20 is braided into a fourth reinforcing layer 14D (outer reinforcing layer) in a blade shape. The other points are the same as in the first embodiment.

  Also in the second embodiment, similarly to the first embodiment, when the hose 10B is damaged and the resin tube 20 is broken, the hose is based on the colorant or the fluorescent agent leaked from the resin tube 20. This is advantageous for easily and surely visualizing the occurrence of trauma in 10B.

Further, since the resin tube 20 is braided on the fourth reinforcing layer 14D in the shape of a blade, the resin tube 20 is easily deformed following the bending of the hose 10B, as in the first embodiment, and the hose 10B is flexible. It is advantageous in securing the property.
In addition, the resin tube 20 can be braided using an existing braiding machine, which is advantageous in suppressing an increase in manufacturing equipment costs.

  In the embodiment, the case where the hose 10B includes the four reinforcing layers 14A to 14D has been described. However, the reinforcing layer may be one layer, two layers, three layers, or five layers or more. Of course.

Further, in the embodiment, the case where the hose 10B is a hydraulic hose (high pressure hose) for construction machinery has been described, but the present invention is naturally applicable to a low pressure hose.
In the case of a low-pressure hose, the reinforcing layer does not require that much strength. Therefore, the reinforcing layer can be formed by spirally winding fiber cords instead of steel wires, or braiding the fiber cords in a blade shape. Consists of.
Of course, the fluid flowing through the hose is not limited to hydraulic oil, and may be various liquids or various gases.

  10A, 10B ... hose, 12 ... rubber tube layer, 14A ... first reinforcing layer, 14B ... second reinforcing layer, 14C ... third reinforcing layer, 14D ... fourth reinforcing layer ( Outer reinforcing layer), 16A... First intermediate rubber layer, 16B... Second intermediate rubber layer, 16C... Third intermediate rubber layer, 18.

Claims (7)

A rubber tube layer,
One or more reinforcing layers laminated on the outside of the rubber tube layer;
A hose comprising a cover rubber layer laminated on the outer side of the outer reinforcing layer disposed on the outermost side of the reinforcing layer,
Between the outer reinforcing layer and the cover rubber layer, an elastically deformable resin tube enclosing a colorant or a fluorescent agent is wound,
A hose characterized by that. The resin tube is spirally wound around the outer reinforcing layer, or is braided into the outer reinforcing layer in a blade shape,
The hose according to claim 1. The colorant and the fluorescent agent have a hue or lightness or saturation that is distinguishable with respect to the cover rubber layer.
The hose according to claim 1 or 2, wherein The main component of the colorant and the fluorescent agent is a synthetic resin emulsion.
The hose according to any one of claims 1 to 3 , wherein:   A plurality of the reinforcing layers are provided,
  An intermediate rubber layer is laminated between the reinforcing layers,
  The resin tube is attached between the outer reinforcing layer and the cover rubber layer with the rubber of the cover rubber layer and the rubber of the intermediate rubber layer laminated inside the outer reinforcing layer. ,
  The hose according to any one of claims 1 to 4, wherein:   The braid density of the resin tube is 50 to 90%.
  The hose according to any one of claims 1 to 5, wherein:   The hose is a hydraulic hose,
  The hose according to any one of claims 1 to 6, wherein:

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