JPS639153B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a flexible hose used, for example, in transporting crude oil and other substances from a tanker on the sea to an oil storage facility on land, and a method for manufacturing the same. , which provides effective prevention of leakage of transport fluid.

(Prior Art) Conventional hoses of this type include, for example, a pair of nipples arranged opposite to each other, at least one rib protruding from the outer periphery of each nipple, and a rib on each nipple. An inner rubber is joined to the outer periphery of the opposite end so as not to go beyond the rib, and provides interconnection of both nipples, and an inner rubber is disposed around the outer periphery of the inner rubber and wraps the bead wire at a position beyond the rib. Some devices include at least one reinforcing layer that is folded back, and spiral wire and outer rubber that are sequentially disposed on the outer periphery of the reinforcing layer.

According to such a flexible hose, when used at sea, for example, if it is repeatedly bent by waves or other influences,
This prevents peeling of the inner rubber from the nipple due to the difference in elastic modulus between the nipple, which is a rigid body, and the inner rubber, which is an elastic body, and damage to the inner rubber near the joint between the two. By using the tightening force of the spiral wire wound around the outer periphery of the reinforcing layer, it is possible to effectively prevent the transport fluid from leaking out of the hose along the nipple.

(Problems to be Solved by the Invention) However, in such conventional hoses, the leakage of the transport fluid was prevented only by the action of the spiral wire, and in response to the recent demand for lighter hoses, However, when the hose was made wireless, there was a problem in that leakage of the transport fluid could not be prevented at all.

The present invention advantageously solves the problems of the prior art, and provides a hose that can sufficiently prevent leakage of transport fluid even when the hose is made wireless, and a preferred method for manufacturing the hose. It is something to do.

(Means for Solving the Problems) In the hose of the present invention, at least one rib protruding toward the outer periphery of the nipple and a reinforcing layer located on the outer periphery of the inner rubber are essential components for this type of hose. In view of this, leakage of transport fluid,
The structure of blocking at the rib part was made based on the knowledge that it can be applied with or without a spiral wire, and each nipple is arranged opposite to each other and forms a pair of nipples. At least one rib is provided protruding on the outer periphery of the
An inner rubber is joined to the outer periphery of the opposing ends of both nipples to provide interconnection between them, and an end portion of at least one reinforcing layer disposed on the outer periphery of the inner rubber is connected to a position beyond the rib. In a hose in which a bead wire is wrapped and folded back, and an outer skin rubber is arranged on the outer periphery of the reinforcing layer, the surface of the rib facing toward the end of the hose, in other words, the outer surface, and the folded end portion of the reinforcing layer. An elastic layer in which short fibers or monofilament canvas is embedded is interposed between the layers.

Furthermore, in the hose manufacturing method of the present invention, when manufacturing the above-mentioned hose, unvulcanized rubber for the inner surface rubber is arranged on the outer periphery of the opposite end of each nipple, and at least the outer surface of the rib is vulcanized. The reinforcing layer is covered with sulfurized rubber or an oil-resistant resin material with low fluidity when heated, and the end portion of the reinforcing layer placed on the outer peripheral side of the unvulcanized rubber is placed at a position beyond the vulcanized rubber or oil-resistant resin material. , wrap the bead wire and fold it back, and then on the outer peripheral side of the reinforcing layer,
After the unvulcanized rubber for the outer skin rubber is placed, these are vulcanized and bonded to each other.

(Function) In the hose of the present invention, the elastic layer is sandwiched between the folded end portion of the reinforcing layer and the outer surface of the rib by the tension force of the reinforcing layer when internal pressure is applied thereto. Even if the internal rubber peels off or breaks from the nipple as a result of repeated bending deformation of the hose, and leakage fluid reaches the ribs along the outer circumferential surface of the nipple, the transportation of the fluid will be prevented. Because the fluid cannot cross the ribs due to the sealing action of the elastic layer, the leaked fluid can almost certainly be prevented from leaking out of the hose along the outer peripheral surface of the nipple.

In addition, by reinforcing the elastic layer with short fibers or monofilament canvas embedded therein, cracks occur there due to fatigue failure or other destruction of the elastic layer sandwiched as described above. This can be sufficiently prevented.

Moreover, the short fibers or monofilament canvas used here can form an elastic layer, for example, in complete contact with the rubber material, and in addition to leaving no gaps between each fiber and the rubber material, each Since there are also no gaps within the fibers, even if cracks occur in the elastic layer, the risk of leakage fluid leaking out of the elastic layer through the gaps can be eliminated.

In addition, in the hose manufacturing method of the present invention, at least the entire outer surface of the rib is covered in advance with vulcanized rubber in a fully vulcanized state or semi-vulcanized state, or an oil-resistant rubber with low fluidity when heated is used. By covering with a resin material, the flow of the vulcanized rubber or oil-resistant resin material during vulcanization of other unvulcanized rubber is sufficiently restrained, and the desired elastic layer is formed at a predetermined position. can be formed.

Therefore, the elastic layer has the above-mentioned effects,
It can always be performed reliably.

In particular, when covering the outer surface of the rib with semi-vulcanized vulcanized rubber or oil-resistant resin material, short fibers, monofilament canvas, etc. may be buried there to prevent subsequent vulcanization. The flow of the rubber material can be more fully restrained.

(Example) Examples of the present invention will be described below based on the drawings.

The figure is a sectional view of the main part of this invention, and 1 in the figure is
One of the nipples in a pair is shown, which are arranged opposite to each other, and this nipple 1 has, at its end,
It has a flange 1a as an example of a connecting means.

Here, in addition to providing a single rib 1b protruding radially outward from the outer peripheral surface of the nipple 1 at the intermediate portion in the length direction, another rib 1c is provided in order to further increase the strength of the end of the hose. Also provided.

2 is the outer periphery of the opposite end of each nipple 1, closer to the center of the hose than the top of the rib 1b,
In other words, oil-resistant inner rubber is arranged on the inside and interconnects both nipples 1, and 3 indicates a reinforcing layer arranged around the outer periphery of the inner rubber. This reinforcing layer 3 is formed of, for example, cord, canvas, etc., and extends beyond the rib 1b to the outside thereof, and its end portion is folded back and fixed around the bead wire 4 there.

5 indicates an elastic layer interposed between at least the surface of the rib 1b facing toward the end of the hose, in other words, the entire outer surface 1b' and the folded end portion of the reinforcing layer 3; The layer 5 is formed by covering the outer surface 1b' of the rib 1b with vulcanized rubber, that is, fully vulcanized rubber or semi-vulcanized rubber, or with an oil-resistant resin material such as nylon that has low fluidity when heated. After covering, it is constructed by performing re-vulcanization when vulcanizing the hose, which will be described later. Here, the pre-vulcanized state of the rubber must be such that the rubber does not flow from its disposed position when it is re-vulcanized. In this case, the oil-resistant resin material also functions similarly to vulcanized rubber.

In the illustrated example, the inner rubber 2 is covered over its entire length by the elastic layer 5, but the original function of the elastic layer 5 is to cover at least the rib 1b as described above. an outer surface 1b′;
This can be achieved by interposing it between the folded end portion of the reinforcing layer 3.

In order to increase the strength of the elastic layer 5, it is preferable to embed short fibers, canvas, etc. therein.
Furthermore, when the canvas is a plain weave canvas made of single fibers, in addition to the fact that there is no gap inside each single fiber, the vulcanized rubber or oil-resistant resin material constituting the elastic layer 5 is The fibers are firmly adhered to each other, and no gaps remain between each fiber, so even if the monofilament canvas is exposed from the elastic layer 5, the fluid passing through the gaps described above will be prevented. In addition to being able to sufficiently prevent leakage, when the elastic layer 5 is disposed over the entire length of the inner rubber 2 as in the illustrated example, if the inner rubber 2 is damaged, the transport fluid may leak to the elastic layer 5. Even if it reaches
Since the canvas does not cause capillary action, it can sufficiently prevent the transport fluid from moving in the axial and radial directions of the hose.

Reference numeral 6 indicates a reinforcing cloth that extends to the outer circumferential position of the inner rubber 2, in the illustrated example, the outer circumferential position of the elastic layer 5, and to the edge of the elastic layer 5 on the outer surface side of the rib 1b. Although the reinforcing fabric 6 is not an essential component of the present invention, it serves to increase the strength of the hose. This reinforcing cloth 6
For example, the canvas can be made of a canvas made of yarn made by twisting a plurality of fibers together.

In addition, in order to obtain sufficient vulcanization adhesion between the inner rubber 2, the elastic layer 5, the reinforcing cloth 6, and the reinforcing layer 3, NBR coating is applied to the inner and outer peripheral surfaces of the elastic layer 5, and the reinforcing cloth 6 is coated with NBR. Similarly, on the inner peripheral surface of
In addition to coating NBR, it is preferable to apply NR coating to the outer peripheral surface. Further, it is desirable that the ends of the elastic layer 5 and the reinforcing cloth 6 are fixed to the outer surface of the rib 1b.

7 is arranged on the outer periphery of the reinforcing layer 3, although this is also not an essential component of the present invention, and the rib 1c
3 shows another reinforcing layer that is bent and fixed in the same way as reinforcing layer 3.

8 particularly shows a circumferential tightening cord wound around the reinforcing layers 3, 7 and the bead wire 4 in order to securely fix the end of the hose to the nipple 1, and 9 is arranged at the outermost periphery of the hose. Indicates a weather-resistant outer rubber.

According to the hose configured in this way, the elastic layer 5
is pressed against the outer surface of the rib 1b as if it were a sealing material because the reinforcing layer 3 is tensed in the axial and radial directions due to the action of the internal pressure of the hose during fluid transport. Even if the inner rubber 2 is damaged or peeled off and the transport fluid leaks along the outer circumferential surface of the nipple 1, the fluid cannot cross the rib 1b, and therefore the leaked fluid is Leakage to the outside of the hose along the line will almost certainly be prevented. On the other hand, since the elastic layer 5 also acts as a pad, it is possible to prevent the reinforcing layer 3 from abrasion due to contact with the rib 1b, thereby increasing its durability.

In addition, since the elastic layer 5 here is reinforced by short fibers or monofilament canvas embedded therein, fatigue failure of the elastic layer 5 due to the action of repeated stress on the elastic layer 5, in the illustrated example, is not possible. In addition, it is possible to sufficiently resist deformation failure at the corners of the ribs 1b and effectively prevent the generation of cracks in the elastic layer 5. Moreover, since short fibers or monofilament canvas used as a reinforcing material do not have any spaces inside them or between them and the elastic layer 5, even if cracks occur in the elastic layer 5, reinforcing Even if the material is exposed, the elastic layer 5 is able to sufficiently maintain its sealing function, as described above.

Furthermore, when manufacturing the hose as described above, unvulcanized rubber for the inner surface rubber is arranged on the outer periphery of the opposite end of each nipple 1, and at least the outer surface of the rib 1b is covered with vulcanized rubber or The reinforcing layer 3 is covered with an oil-resistant resin material that has low fluidity when heated, and is placed on the outer peripheral side of the unvulcanized rubber. 4 is wrapped and folded back, and further, unvulcanized rubber for the outer skin rubber is placed on the outer circumferential side of the reinforcing layer 3, and after that, so-called hose vulcanization is performed to vulcanize and bond each of these to each other. If you do
During the vulcanization, the flow of the vulcanized rubber or oil-resistant synthetic resin material as the constituent material of the elastic layer 5 is sufficiently restricted, and as a result, the elastic layer 5 is placed in the desired position. Therefore, the elastic layer 5 can reliably perform its function without variations in manufacturing quality.

In addition, when manufacturing a hose in this way, if short fibers, monofilament canvas, etc. are embedded in semi-vulcanized vulcanized rubber or oil-resistant resin material, during vulcanization of the hose, The flow can be more effectively prevented, resulting in a more suitable elastic layer 5.

(Effects of the Invention) As is clear from the above description, according to the present invention, not only when a spiral wire is disposed, but also when the spiral wire is not disposed.
Since it is possible to almost certainly prevent the transport fluid from leaking from the hose, the weight of the hose can be reduced by making it wireless.

In addition, by reinforcing the elastic layer with short fibers or monofilament canvas, it is possible to effectively prevent cracks from occurring in the elastic layer, and even if
Even if such cracks occur, the sealing function of the elastic layer can be sufficiently maintained.

In addition, when a hose is manufactured by the method of the present invention, a proper elastic layer can always be formed, and each of the above-mentioned functions can be exhibited extremely effectively.

[Brief explanation of the drawing]

The figure is a sectional view of a main part showing an embodiment of the present invention. 1...Nipple, 1a...Flange, 1b, 1
c... Rib, 2... Inner surface rubber, 3, 7... Reinforcement layer, 4... Bead wire, 5... Elastic layer, 6...
Reinforcement cloth, 8... Circumferential tightening cord, 9... Outer rubber.

Claims (1)

[Scope of Claims] 1. A pair of nipples disposed facing each other, at least one rib protruding from the outer periphery of each nipple, and a rib joined to the outer periphery of the opposite end of each nipple to connect them. an interconnecting inner rubber; at least one reinforcing layer disposed on the outer periphery of the inner rubber; and folded back around the bead wire at a position beyond the rib; and further on the outer periphery of the reinforcing layer. A hose with a rubber outer skin, in which an elastic layer in which short fibers or monofilament canvas is embedded is interposed between the surface of the rib facing the end of the hose and the folded end of the reinforcing layer. . 2. A pair of nipples arranged to face each other, at least one rib protruding from the outer periphery of each nipple, and an inner rubber jointed to the outer periphery of the opposite end of each nipple to interconnect them. , comprising at least one reinforcing layer disposed on the outer circumferential side of the inner rubber and folded back around the bead wire at a position beyond the rib, and an outer skin rubber disposed further on the outer circumferential side of the reinforcing layer, of ribs,
When manufacturing a hose in which an elastic layer is interposed between the surface facing the end of the hose and the folded end portion of the reinforcing layer, a blank for inner rubber is placed on the outer periphery of the opposite end of each nipple. In addition to arranging the vulcanized rubber, at least the surface of the rib facing the end of the hose is covered with vulcanized rubber or an oil-resistant resin material with low fluidity when heated, and the outer peripheral side of the unvulcanized rubber is The end portion of the placed reinforcing layer was folded back around the bead wire at a position beyond the vulcanized rubber or oil-resistant resin material, and further, unvulcanized rubber for the outer skin rubber was placed on the outer periphery of the reinforcing layer. A method for manufacturing a hose, characterized in that these are then vulcanized and bonded.