JPH0336792Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> This invention relates to flexible rubber pipes, and more specifically, to large-diameter flexible pipes that are mainly used in dredging pipelines and oil delivery pipelines. This invention relates to an improvement in the connection structure between a rubber tube body and a joint tube in a flexible rubber tube.

<Prior Art> Conventionally, as shown in FIG. 4, the connection structure between the rubber tube main body and the joint pipe of the rubber flexible pipe is made by vulcanizing the inner layer rubber 13 of the rubber pipe 1 and the joint pipe 2. At the same time, the folded end of the reinforcing layer 11 of the rubber tube 1 is tightened with a wire 12, and a single annular rib 22 is formed on the outer periphery of the sleeve portion 21 of the joint tube 2 to prevent it from coming off. be.

However, when a flexible tube is used, a strong tensile force is applied to the joint end portion as the flexible tube is bent, resulting in the problem that the joint tube 2 may come off from the rubber tube 1.

For this reason, as shown in FIG. 5, two ribs 22 and 22' are formed on the sleeve portion 21 of the joint pipe 2.
The folded end of the inner reinforcing layer 14 is connected to the inner rib 22.
In addition, a flexible tube in which the folded ends of the outer reinforcing layer 15 are engaged with the outer ribs 22' to prevent the joint tube 2 from coming off is also used, but according to this flexible tube, the inner layer Since the effective length of the reinforcing layer 14 is shorter than the effective length of the outer reinforcing layer 15, when a tensile force is applied, the elongation rate of the inner reinforcing layer 14 is lower than the elongation rate of the outer reinforcing layer 15. As a result, the inner reinforcing layer 14 fatigues relatively quickly, and a larger tensile force acts on the inner reinforcing layer 14, resulting in the inconvenience that the inner reinforcing layer 14 breaks relatively quickly. be.

Therefore, recently, due to advances in adhesive processing technology and wire tightening processing technology, a single rib structure shown in FIG. 4 that can exhibit sufficient resistance to tensile force has been provided.

However, the rib 22 at the joint end of the flexible tube is provided considering only the tensile force due to internal pressure and external force, and therefore,
When the flexible tube is excessively bent during rough seas and compressive force is applied to the bent end of the rubber tube 1 in the direction of the flange 23 of the joint tube 2, the rubber tube 1 and the joint tube 2
A shearing force is applied to the interface with the outer peripheral surface of the sleeve 21, causing separation at the interface between the two, resulting in leakage of conveyed materials such as earth, sand, oil, etc. from the separation, resulting in the problem of contaminating the sea and rivers. Ta.

<Purpose> This invention was made in view of the above problems, and provides a flexible rubber tube that prevents interfacial peeling between the rubber tube and the sleeve of the joint tube and maintains strong bonding strength for a long period of time. The purpose is to

<Structure> The structure of this invention to achieve the above object is that a flexible rubber tube is formed by engaging a rubber tube end with a single annular rib formed on the outer periphery of a sleeve portion of a joint tube. , characterized in that a locking part is formed on the outer periphery of the sleeve part of the joint pipe to make surface contact with the end of the rubber pipe to suppress movement of the end of the rubber pipe toward the joint pipe flange. It is.

<Example> Hereinafter, an example will be described in detail with reference to FIGS. 1 to 3 showing examples.

First, in the embodiment shown in FIG. 1, the basic configuration is the same as the conventional example shown in FIG.
The reinforcing layer 11 interposed between the outer layer 16 and the outer rubber layer 16 is made of rubberized cloth made of cotton, polyester, rayon, polyamide, nylon, etc. and laminated in multiple layers. It is firmly tightened.

Further, the joint pipe 2 is inserted between the inner layer rubber 13 and the inner cover rubber 17 of the rubber pipe 1 and is vulcanized and bonded.

Further, a single annular rib 22 having a substantially trapezoidal cross section is formed on the outer periphery of the sleeve portion 21 of the joint pipe 2, and on the side of the collar portion 23 which is spaced apart from the annular rib 22 by a predetermined distance. An annular projection 24 is formed as a characteristic locking portion.

The protrusion 24 is formed on the end surface 1a of the rubber tube 1.
The folded end 11a of the reinforcing layer 11, which is buried and covered nearby and is tightened by the wire 12, is disposed between the annular rib 22 and the protrusion 24, and is not engaged with the annular rib 22. It is fitted together to prevent it from coming off.

By additionally forming the annular protrusion 24, it is possible to effectively prevent the bent side of the rubber tube end 1b from being pushed toward the flange 23 as the rubber tube 1 is bent. This means that interfacial peeling between the sleeve 21 of No. 2 and the rubber tube end portion 1b can be reliably prevented from occurring.

Next, in the embodiment shown in FIG.
is arranged on the outside of the rubber tube end 1b, and its side surface 24a is in contact with the end surface 1a of the rubber tube 1. In this embodiment, as in the previous embodiment, the bent side end of the rubber tube 1 This can prevent the interface between the sleeve 21 of the joint tube 2 and the rubber tube end 1b from peeling off by suppressing the movement of the rubber tube in the direction of the flange 23.

Furthermore, the rubber flexible tube of this invention may have an annular protrusion 24 as a locking portion connected to the collar portion 23 (see Fig. 3), or a locking portion may be partially attached along the outer periphery of the sleeve 21. Various design changes can be made without changing the gist, such as forming a

<Effects> As described above, according to the rubber flexible tube of this invention, the movement of the rubber tube end toward the joint tube flange is suppressed by the locking portion formed on the outer periphery of the sleeve portion of the joint tube. Therefore, interfacial separation between the sleeve and the end of the rubber tube can be effectively prevented, and a strong bond between the rubber tube and the joint tube can be maintained for a long period of time.

Moreover, since the locking portion is simply added to the conventional joint pipe, the cost burden is small.

Therefore, it is possible to provide a device that has a unique practical effect of being able to reliably prevent seas and rivers from being polluted at low cost.

[Brief explanation of the drawing]

The drawings show a conventional example and an embodiment of this invention. Fig. 1 is a sectional view of a rubber flexible tube of this invention, Figs. 2 and 3 are sectional views showing other embodiments, and Fig. 4 and 5 are cross-sectional views showing conventional examples. DESCRIPTION OF SYMBOLS 1... Rubber tube, 11... Reinforcement layer, 13... Inner layer rubber, 12... Wire, 2... Joint pipe, 21...
... Sleeve, 22 ... Annular rib, 23 ... Flange,
24...An annular projection as a locking part.

Claims (1)

[Scope of claim for utility model registration] 1. Attaching a flange-shaped joint pipe to the end of the rubber pipe,
In a flexible rubber tube in which the end of the rubber tube is engaged with a single annular rib formed on the outer periphery of the sleeve portion of the joint tube, the outer periphery of the sleeve portion of the joint tube has a surface facing the end of the rubber tube. A flexible rubber tube characterized in that a locking portion is formed in contact with the end portion of the rubber tube to suppress movement of the end portion of the rubber tube toward the joint tube flange. 2. The rubber flexible tube according to claim 1, wherein the locking portion is an annular projection.