JPH08178137A - Low stretch pressure resisting hose - Google Patents

Abstract

PURPOSE: To provide a small low-stretching pressure resisting hose reduced in weight, provided with sufficient pressure resistance, and low in stretch against a tensile load. CONSTITUTION: A first fiber reinforcing layer 4 is constituted in such a manner that a fiber reinforcing yarn is spirally wound in a crossing and laminating state around the outer peripheral surface of a cylindrical inner surface rubber layer 2 at an angle approximately equal to a static angle of ±54 deg.44' with the axial direction 3 of each hose 1. An intermediate rubber layer 5; a second fiber reinforcing layer 6 wherein a reinforcing yarn is spirally wound in a crossing and laminating state at an angle of ±40-50 deg. with the axial direction 3; wherein a fiber reinforcing yarn; and an outer surface rubber layer 7 with which the whole of the outer peripheral surface of the second fiber reinforcing layer 6 is covered are formed, in the order, to the outside of the first fiber reinforcing layer 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low elongation pressure resistant hose which is lightweight, has sufficient pressure resistance, and has a small elongation against a tensile load.

[0002]

2. Description of the Related Art A hose has different performance required depending on its use. For example, a hose for cleaning, a hose for fire extinguisher, a hose for chemical injection method for ground improvement, a hose for tank truck, a hose for transporting fuel oil, In addition, in the case of a hose for a measuring instrument or the like, in addition to pressure resistance, it is particularly required to have a property that the amount of expansion and contraction when a tensile load is applied or unloaded is small. This is because the hose is often used in a long length, and in this case, when the hose wound around a reel or the like is pulled out at the time of use, the hose itself is not supported by its own weight or external force. A fairly large tensile load may act, and this tensile load is applied.
This is because if the hose expands and contracts a lot when unloading, it becomes very difficult to handle. In addition, when it is necessary to position the tip of the hose, it is difficult to use because of the large amount of expansion and contraction.

[0003] In addition, when a high-strength hose is used for a long length, it is difficult to handle it, so that due to some trouble, a part of the hose is easily caught in an unintended place. When the hooked part of the hose comes off, the hose jumps up in an unexpected direction due to the reaction due to the large amount of expansion and contraction, and as a result, it was very dangerous if there were people or dangerous materials nearby.

Therefore, the conventional low-extension pressure-resistant hose uses a braided reinforcing layer of a metal wire having a low extensibility as its reinforcing layer. However, in the case of this reinforcing layer, the weight of the hose becomes considerably heavy, and therefore the handling is difficult. It had the big drawback of being difficult. Therefore, in order to reduce the weight, attempts have been made to use a fiber reinforcing layer as the reinforcing layer.

In a hose having a fiber reinforcing layer, the reinforcing layer has a fiber reinforcing thread of ± 54 ° 4 with respect to the axial direction of the hose.
Although only knitted at an angle close to the static angle of 4 ', the pressure resistance was sufficient, but when a tensile load was applied to the hose as described above, it was knitted at an angle near the static angle. The fiber-reinforced layer could not sufficiently counter the tensile load, and as a result, the hose also expanded greatly.

Further, regardless of whether it is a metal wire or a fiber reinforcing yarn, the conventional reinforcing layer is generally formed into a braid structure. However, the braid structure is manufactured when a hose is continuously manufactured. There is a problem that the process becomes very complicated and the line speed becomes slow, resulting in high manufacturing cost.

[0007]

DISCLOSURE OF THE INVENTION An object of the present invention is to arrange two fiber reinforcing layers which are spirally wound and cross-laminated, and set the crossing angle of each fiber reinforcing layer appropriately. Accordingly, it is to provide a low elongation pressure resistant hose that is lightweight, has sufficient pressure resistance, and has a small elongation with respect to a tensile load.

[0008]

In order to achieve the above object, the low elongation pressure-resistant hose of the present invention comprises a fiber-reinforced yarn on the outer peripheral surface of a cylindrical rubber layer on the inner surface of ± 54 with respect to the axial direction of the hose. A first fiber-reinforced layer formed by spirally winding and cross-laminating is provided at an angle close to the static angle of 44 °, and fiber-reinforced yarns are provided outside the first fiber-reinforced layer in the axial direction. On the other hand, a second fiber reinforcing layer formed by spirally winding and cross-laminating at an angle of ± 40 to 50 °, and a coating layer covering the entire outer peripheral surface of the second fiber reinforcing layer are provided. In order to improve the adhesiveness with each reinforcing layer, it is preferable to dispose an intermediate rubber layer between the first fiber reinforcing layer and the second fiber reinforcing layer. The fiber-reinforcing thread mentioned here means a cord or monofilament of organic fiber made of vinylon, polyester, nylon, aramid or the like.

The coating layer is usually composed only of the outer rubber layer, but it is preferable to further cover the entire outer peripheral surface of the outer rubber layer with a resin layer having good colorability. By disposing the resin layer, the appearance of the hose can be improved, the sense of quality can be increased, and the commercial value can be increased. In addition, in the case of applications requiring conductivity for removing static electricity, a ground wire may be provided as a part of the first fiber reinforcing layer or between the first fiber reinforcing layer and the second fiber reinforcing layer. It is preferable to provide it.

FIG. 1 is a partial side view of a typical low elongation pressure-resistant hose according to the present invention in which each layer is partially stripped off, where 1 is a low elongation pressure-resistant hose, 2 is an inner rubber layer, 3 is the axial direction of the hose 1, 4 is the first fiber reinforcement layer, 5
Is an intermediate rubber layer, 6 is a second fiber reinforcing layer, 7 is an outer rubber layer,
8 is a resin layer.

In the low elongation pressure-resistant hose 1 of this figure, a fiber reinforcing yarn is provided on the outer peripheral surface of a cylindrical inner surface rubber layer 2 at an angle close to a static angle of ± 54 ° 44 'with respect to the axial direction 3 of the hose 1, respectively. Then, the first fiber reinforcing layer 4 formed by spirally winding and cross-laminating is provided, and the intermediate rubber layer 5 and the fiber reinforcing yarn are respectively provided outside the first fiber reinforcing layer 4 in the axial direction 3. On the other hand, the second fiber reinforcing layer 6 formed by spirally winding and cross-laminating at an angle of ± 40 to 50 ° and the outer rubber layer 7 as a coating layer are sequentially arranged.

The angle of the fiber-reinforcing yarn of the first fiber-reinforced layer 4 with respect to the axial direction 3 is set to an angle close to the rest angle of ± 54 ° 44 'in the circumferential direction of the hose 1 and the axial direction 3. This is because the strength is the same, which allows the hose 1
This is because the first fiber reinforcing layer 4 plays a pressure-resistant role against dimensional changes in diameter and length, breaking pressure, and the like. Further, the angle of the fiber reinforcing yarn of the second fiber reinforcing layer 6 with respect to the axial direction 3 is ± 40 to 50 °.
This is because the second fiber reinforcing layer 6 plays a role of suppressing the elongation of the hose 1 in the axial direction 3 against a tensile load. That is, the smaller this angle is, the smaller the elongation can be, but on the other hand, since it is easy to cause manufacturing problems such as the wound fiber-reinforcing yarn slipping off easily, the lower limit of the angle is ± 40 °, Further, the reason for setting it to ± 50 ° or less is that if it exceeds this, the effect of suppressing the elongation of the hose 1 in the axial direction 3 against a tensile load is not remarkable.

In FIG. 1, the coating layer is composed of only the outer surface rubber layer 7, but as shown in FIG. 3, the outer surface rubber layer 7 and the entire outer peripheral surface thereof are covered with a resin layer 8 having good colorability. It may be configured to cover.

When conductivity is required to remove static electricity, a ground wire 9 is provided as a part of the first fiber reinforcing layer 4 as shown in FIGS. 2 and 3, or It is also possible to similarly arrange the ground wire 9 between the one fiber reinforcing layer 4 and the second fiber reinforcing layer 6.

Next, an example of a procedure for manufacturing the low extension pressure resistant hose 1 will be described. This low extension pressure resistant hose 1
In order to manufacture the above, first, an inner rubber layer 2 is formed on a mandrel by an extruder, and a fiber reinforcing yarn is formed on the inner rubber layer 2 by a spiral machine at 54 ° 44 ′ with respect to the axial direction 3 of the hose 1. Spirally wrap at a close angle, then
Then, the first fiber reinforcing layer 4 is formed by spirally winding and laminating at an angle close to −54 ° 44 ′ with respect to the axial direction 3. Next, a second fiber reinforcing layer 6 is formed on the intermediate rubber layer 5 formed by being inserted on the first fiber reinforcing layer 4 in the same manner as the first fiber reinforcing layer 4, and the outer peripheral surface thereof is After the rubber layer 7 is covered with an extruder, it is vulcanized and the mandrel is pulled out to manufacture the hose 1. In addition,
The step of providing each layer of the hose 1 may be performed independently or continuously, but in the present invention, the first and second fiber reinforcing layers 4 and 6 are spirally formed from the conventional blade structure. Since the structure is used, it is advantageous to continuously perform a series of manufacturing steps because the line speed can be increased.

[0016]

In the low elongation pressure resistant hose of the present invention, by using the fiber reinforcing layer as the reinforcing layer, the weight can be significantly reduced as compared with the conventional hose having the reinforcing layer made of the metal wire.

Further, the number of the fiber reinforcing layers is two, and the angles of the fiber reinforcing yarns constituting the first fiber reinforcing layer with respect to the axial direction of the hose are crossed at an angle close to the static angle of ± 54 ° 44 '. The angle of the fiber reinforced yarns that are arranged to form the second fiber reinforced layer with respect to the axial direction of the hose is ± 40 to
By arranging them so that they intersect at an angle of 50 °, the former plays a pressure-proof role against dimensional changes in the diameter and length of the hose and the breaking pressure, while the latter plays a role in the axial direction of the hose. It can play a role of suppressing elongation against tensile load to the hose, and as a result, it can impart sufficient pressure resistance to the hose itself, and at the same time, it has been a problem of the conventional hose having a fiber reinforced layer. Elongation due to a tensile load on the sheet is also suppressed.

Further, the hose of the present invention is manufactured by laminating the first and second fiber reinforcing layers respectively in a spiral shape and cross-laminating the hose to obtain a hose having a fiber structure having a blade structure. However, the manufacturing process is simplified and the line speed can be increased.

[0019]

EXAMPLE A specific example of the low extension pressure-resistant hose 1 according to the present invention will be described with reference to FIG. The low extension pressure resistant hose 1 used in the examples has an inner diameter of 16 mm and a rubber thickness of 1.
A fiber cord made of vinylon with a cord size of 1800 denier is spirally wound and intersected with the axial direction 3 of the hose 1 at an angle of ± 54.8 ° on the outer peripheral surface of the 5 mm cylindrical inner rubber layer 2. A laminated first fiber reinforcing layer 4 is provided, and a rubber thickness of 0.3 m is provided on the outer side of the first fiber reinforcing layer 4.
A second fiber reinforced layer formed by spirally winding and cross-laminating an intermediate rubber layer 5 of m and a fiber cord of vinylon having a cord size of 1800 denier at an angle of ± 45 ° with respect to the axial direction 3 respectively. 6 and an outer rubber layer 7 that covers the entire outer peripheral surface of the second fiber reinforcing layer 6 are sequentially provided.

The low elongation pressure-resistant hose used in the conventional example is a braid structure in which a reinforcing layer is woven with a fiber cord made of vinylon having a cord size of 1800 denier at an angle of ± 54.8 ° with respect to the axial direction 3 of the hose 1, respectively. Having 1
The inner rubber layer, the intermediate rubber layer, and the outer rubber layer were the same as those used in the example.

The low elongation pressure-resistant hose used in the comparative example has a braid structure in which a reinforcing layer is woven with a fiber cord made of vinylon having a cord size of 1800 denier at an angle of ± 54.8 ° with respect to the axial direction 3 of the hose 1. Having 2
It has the same hose structure as that of the conventional example except that it is composed of a fiber-reinforced layer.

(Test method) In the test, the tensile load was increased by 20 kgf to 200 kgf in each hose, and the elongation (%) of the hose at that time was measured. This result is shown in Figure 4.
Shown in

From FIG. 4, in the example, the elongation with respect to the tensile load is significantly suppressed as compared with the conventional example and the comparative example. In addition, when the pressure resistance was investigated, the normal working pressure was 10 kgf / cm ² and the maximum working pressure was 50 kgf / cm ^{2 for} both hoses.
It has been found that it can withstand the internal pressure up to.

[0024]

According to the present invention, the weight can be remarkably reduced as compared with the conventional hose having the reinforcing layer made of the metal wire. Further, it has become possible to suppress the elongation of the hose in the axial direction against a tensile load, which has been a problem of the conventional hose having the fiber reinforced layer.
It is now possible to provide low extension pressure resistant hoses. In addition, the hose of the present invention, the first and the second fiber reinforcing layer, each by spirally wound and cross-laminated to manufacture, compared to a conventional hose having a fiber reinforcing layer of a blade structure, The manufacturing process is simplified, the line speed can be increased, and as a result, the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a partial side view of a typical low elongation pressure resistant hose according to the present invention with each layer partially stripped.

FIG. 2 is a partial side view of another low extension pressure resistant hose according to the present invention.

FIG. 3 is a partial side view of another low extension pressure resistant hose according to the present invention.

FIG. 4 is a diagram in which a change in elongation of the hose with respect to a tensile load is plotted.

[Explanation of symbols]

 1 Low expansion pressure resistant hose 2 Inner rubber layer 3 Axial direction of hose 1 4 First fiber reinforcing layer 5 Intermediate rubber layer 6 Second fiber reinforcing layer 7 Outer rubber layer 8 Resin layer 9 Ground wire

Claims (6)

[Claims] 1. A fiber-reinforced yarn is spirally wound and cross-laminated on the outer peripheral surface of a cylindrical inner rubber layer at an angle close to a static angle of ± 54 ° 44 'with respect to the axial direction of the hose. The first fiber reinforced layer is formed, and the fiber reinforced yarn is provided outside the first fiber reinforced layer by ± 40 to the axial direction, respectively.
Low elongation characterized in that it is provided with a second fiber reinforcing layer formed by spirally winding and cross-laminating at an angle of 50 °, and a coating layer covering the entire outer peripheral surface of the second fiber reinforcing layer. Pressure hose. 2. The low elongation pressure resistant hose according to claim 1, wherein an intermediate rubber layer is provided between the first fiber reinforcing layer and the second fiber reinforcing layer. 3. The coating layer comprises an outer rubber layer.
Or the low extension pressure resistant hose described in 2. 4. The low elongation pressure-resistant hose according to claim 1, wherein the coating layer comprises an outer surface rubber layer and a resin layer covering the entire outer peripheral surface of the outer surface rubber layer. 5. The low extension pressure-resistant hose according to claim 1, wherein a ground wire is provided as a part of the first fiber reinforcing layer. 6. The low extension pressure-resistant hose according to claim 1, further comprising a ground wire disposed between the first fiber reinforcing layer and the second fiber reinforcing layer.