JPS6326451Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a rubber tube that is used by being incorporated into a pipeline for dredging work, and in particular, a rubber pipe that is suitable for dredging work in coral reef areas.

As is well known, in dredging pipelines including suction lines and delivery lines, in order to impart flexibility to the lines,
A relatively large-diameter rubber pipe is interposed between the main steel pipes, but especially when the work is carried out in coral reef areas, the debris flows through the pipeline under high pressure. Solid particles such as coral fragments and crushed stones with sharp edges violently collide with the inner peripheral surface of the rubber tube. As a result, the inner circumferential surface of the rubber tube is torn and torn off by the particles, resulting in early wear and tear. Various ideas have been proposed as countermeasures, but the present applicant also previously proposed
No. 55-116809 and other ideas, we have proposed a rubber pipe for dredging work in which a plurality of metal rings with tapered inner surfaces are embedded at appropriate intervals on the inner peripheral surface of the rubber pipe.

The structure of this rubber tube is as schematically shown in FIG. 5, and as mentioned earlier, the rubber tube R has a metal ring M with a tapered inner circumferential surface embedded in its inner circumferential surface, so that it can be easily removed by dirt and debris. Solid particles S such as coral fragments contained in the flow collide with the tapered inner circumferential surface m ₁ of the ring M and are blown off in the direction of the tube axis.
It is pushed away by high-pressure fluid and discharged outside the pipe, more precisely into the following iron pipe. In this way, in the rubber tube of the previous invention, the coral debris S is removed by the ring M.
As a result, the chance of direct collision of the rubber tube R with the inner circumferential surface of the rubber tube R is minimized, and as a result, tearing and abrasion of the inner circumferential surface of the rubber tube R is significantly improved.

However, since extremely high internal pressure is applied to this rubber tube R during use, the rubber material swells in the radial direction, and the vertical end surface m ₂ of the metal ring M embedded in this rubber tube R becomes rubber. Peeling from the contact surface often occurs. It is presumed that the occurrence of such peeling damage on the vertical left and right end surfaces _m2 of the metal ring M is mainly due to insufficient adhesive strength originating from the manufacturing process of the rubber tube.
That is, to briefly explain the method for manufacturing the rubber tube, first, a plurality of metal rings are placed on a mandrel at predetermined intervals. Next, after sequentially laminating the unvulcanized rubber sheet and the reinforcing cloth layer, the outer circumferential surface thereof is tightly wrapped with a relatively wide tape-like cloth. The unvulcanized rubber tube thus formed is finally loaded into a vulcanizing can and vulcanized under a predetermined steam pressure. As can be seen from the above forming operation, the force applied to the vertical left and right end surfaces is weaker than the force that presses the surrounding rubber material against the horizontal outer surface of the metal ring by tightening the tape-like cloth. The adhesion strength with the rubber on the latter (left and right end surfaces) is inferior to that on the former (horizontal outer surface), and therefore, during use, the pressure applied from the inside and outside of the rubber tube or the tensile force at the interface caused by bending deformation of the rubber tube causes Peeling damage occurs.

This idea was created in view of the above-mentioned drawbacks of the conventional technology, and its purpose was to provide a metal ring that was firmly attached to the inner surface of the rubber tube and that could effectively protect against tearing and abrasion damage caused by coral fragments, etc. Our objective is to provide rubber pipes for dredging work.

The above object is to form the outer circumferential wall of a metal ring embedded in a rubber tube into a gently convex curved surface, sandwich at least one reinforcing cloth layer around it, and attach a wire or strong fiber rope to the convex curved surface. This is achieved by uniformly winding the

Hereinafter, this invention will be described in detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows a first embodiment constructed according to this invention as a partially cutaway sectional view. This rubber tube 1 has an outer rubber layer 2 embedded inside a plurality of reinforcing fabric layers 4...
and an inner surface rubber layer 3 integrally formed on the inner peripheral surface of the layer 2, and connecting metal tubes 5, 5 are firmly attached to both left and right ends thereof by vulcanization adhesive. Furthermore, the rubber tube 1 has an inner rubber layer 3
A plurality of metal rings 6 . . . are embedded therein so that their respective inner circumferential surfaces are exposed on the inner circumferential surface of the inner rubber layer 3.

The metal ring 6 includes an inner circumferential wall 7 that is exposed on the inner wall surface of the rubber tube 1 and constitutes a part thereof, and an outer circumferential wall 8 that is embedded within the inner rubber layer 3.
In this case, as shown in detail in FIG. 2, the inner circumferential wall 7 has a top surface 7a formed parallel to the tube axis at the center thereof, and gradually extends from both ends of this top surface 7a to the left and right circumferential ends of the metal ring 6. It is formed into a substantially trapezoidal cross section consisting of a pair of left and right tapered surfaces 7b and 7c that are inclined so as to increase in diameter. On the other hand, the outer circumferential wall 8 is formed with a convex curved surface with gentle continuous curves as shown in the figure. A wire 10 is uniformly wound around the outer circumferential wall 8 through the reinforcing cloth layer 4 and a portion of the outer rubber layer 2 along its convex curved surface. According to this configuration, since the outer peripheral wall 8 is formed as a convex curved surface, the winding force by the wire 10 is applied almost uniformly, and the end face corresponds to the conventional vertical end face m ₂ shown in FIG. Since the thickness of 9 is made small, there is almost no possibility that peeling damage will occur in that part. Note that when this rubber tube 1 is used as a delivery line for a dredging pipeline, the metal ring 6 is wrapped around the wire 10 as described above, but when it is used as a suction line, a strong wire is used instead of the wire. It may also be wrapped tightly with a fiber rope. Also, metal ring 6
The inner peripheral wall 7 has a pair of left and right tapered surfaces 7b, 7.
c is formed, the metal ring 6 is resistant to tearing and abrasion caused by collisions with coral fragments, etc., regardless of whether the rubber tube 1 is connected with its left and right ends in the forward or reverse direction with respect to the fluid flow direction. can be effectively countered.

A second embodiment of this invention is shown in FIGS. 3 and 4. This rubber tube 20 includes a metal ring 21 different from that of the first embodiment described above. That is, this metal ring 21 has a ring-shaped main body portion 22 whose thickness t is extremely thin compared to the width W.
and is longer than this main body portion 22, and
This ring portion 23 includes a tapered ring portion 23 whose diameter is tapered from one end to the other end.
is adapted to be attached coaxially to the main body portion 22. The main body portion 22 includes an inner circumferential wall 22 that is exposed on the inner wall surface of the rubber tube 20 and constitutes a part thereof.
a, and an outer peripheral wall 22b embedded in the inner rubber layer 3
In this case, the inner peripheral wall 22a
An annular groove 22c is formed approximately in the center of the groove. On the other hand, the outer circumferential wall 22b has a convex curved surface with gentle continuous curves as in the previous embodiment, and the reinforcing fabric layer 4 is similarly sandwiched around the outer circumferential wall 22b. The wire 10 is uniformly wound and tightened along the convex curved surface.

The tapered ring portion 23 has four engaging pins 24 protruding outward on its outer peripheral surface near the large diameter end.
... are provided equiangularly radially, and the pin 2
4... are fitted into the annular groove 22c of the main body part 22, so that the ring part 23 is coaxially attached to the main body part 22. To explain in more detail how to attach these members 22 and 23, first, only the main body portion 22 is attached to the inner rubber layer 3 of the rubber tube 20 as shown in the figure, according to the conventional method of manufacturing rubber tubes.
The inner wall surface 22a of the portion 22 is embedded within the rubber tube 20 so that its inner wall surface 22a is aligned with the inner circumferential surface of the rubber tube 20. Next, after the tapered ring portion 23 is inserted into a predetermined position within the rubber tube 20, the engagement pins 24 are inserted into the through holes previously drilled near the large diameter end of the ring portion 23, and The tip of each pin 24 is fitted into the annular groove 22c of the main body portion 22. Finally, the rear end of each engagement pin 24 is connected to a tapered ring 2.
3, the attachment of the main body portion 22 and the tapered ring portion 23 is completed.

In this rubber tube 20, as described above, the main body 22 embedded in the inner rubber layer 3 has a thickness t that is extremely thin compared to the width W, and has a convex curved surface on the outer peripheral wall 22b. Because of this, when the rubber tube is vulcanized, the tightening force from the wrapping cloth acts uniformly on the outer circumferential wall 22b, and the convex curved surface of the outer circumferential wall 22b is firmly bonded to the rubber. Therefore,
The end face of the main body portion 22 hardly ever peels off from the inner rubber layer 3, and even if damage due to peeling occurs, the damage will not grow any further. Further, in this embodiment, the main body 22
Stress is applied to the ring part 23 through the pin 24, which is exposed to a high-pressure mud flow, and the reinforcing fabric layer 4 is placed on the convex curved surface of the outer peripheral wall 22b.
Since the wire 10 is evenly wound and tightened through the wire, the stress is hardly concentrated locally, and exhibits excellent durability. Furthermore, the rubber tube main body of this rubber tube 20 can be manufactured by a conventional method for manufacturing rubber tubes, and the tapered ring portion 23 that will eventually protrude into the rubber tube can be formed using the previously formed rubber tube body. It can be easily attached to the inner peripheral surface of the rubber tube 20. Moreover, the high heat generated when welding the engagement pin 24 is not only transmitted to the rubber tube 20 only through the four pins, but also the high heat generated when welding the engagement pin 24 is transmitted to the rubber tube 20 only through the four pins.
Since it is separate from the rubber tube 20 during welding work,
The heat transferred to the main body portion 22 is extremely weak, so that the rubber elastic material around the main body portion 22 will not be thermally deteriorated.

On the other hand, since the ring part 23 is formed in a tapered shape, coral fragments and the like that collide with it are thrown off in the direction of the tube axis, and are also swept backward by the high-pressure sand flow. Note that this ring portion 23
It is not necessary to completely cover the inner surface rubber layer 3 between the main body parts 22, and may be formed to a length that ends before the front end of the subsequent main body part 22.

As is clear from the description of the embodiments above, according to this invention, it is firmly attached to the inner surface of the rubber tube, and there is almost no risk of it peeling off from the interface with the rubber due to high pressure loads. A rubber pipe for dredging work with a metal ring is provided that can exhibit excellent resistance to tearing and abrasion damage caused by impact with coral fragments, crushed stones with sharp edges, and the like.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway sectional view of the first embodiment of this invention, Fig. 2 is an enlarged sectional view showing the main parts of Fig. 1, and Fig. 3 is a second embodiment of this invention. FIG. 4 is an enlarged sectional view showing the main parts of FIG. 3, and FIG. 5 is a schematic diagram of the structure of a conventional rubber tube. FIG. In the figure, 1 and 20 are rubber tubes, 2 is an outer rubber layer, and 3
4 is an inner rubber layer, 4 is a reinforcing cloth layer, 6 and 21 are metal rings, 7 and 22a are inner peripheral walls, 8 and 22b are outer peripheral walls, and 10 is a wire.

Claims (1)

[Claims for Utility Model Registration] (1) A rubber tubular body in which any number of reinforcing fabric layers are embedded inside the body, and a plurality of metal layers forming part of the inner wall surface of the tubular body. In a rubber pipe for dredging work in which rings are buried at appropriate intervals along the axial direction, the outer circumferential wall of the metal ring buried in the tubular body has a convex curved surface in a cross-sectional shape along the axial direction. A rubber pipe for dredging work, characterized in that a wire or a strong fiber rope is uniformly wound around the outer peripheral wall along its convex curved surface through the reinforcing cloth layer. . (2) In practical use, the inner circumferential wall constituting a part of the inner wall surface of the tubular body of the metal ring is formed in a trapezoidal cross section along the axial direction that bulges toward the center of the tubular body. A rubber pipe for dredging work according to claim 1 of the patent registration claim.