JPS5821976Y2 - Sleeve hose for dredging - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a rubber sleeve hose that is incorporated as a flexible joint pipe into a dredging pipeline, particularly a pipeline used for dredging work in a coral reef area.

Sleeve hoses for the above applications wear out prematurely due to the inner rubber layer being torn due to collisions with solid particles with sharp edges, such as coral stones and crushed pieces of rock, contained in the fluid conveyed at high pressure. In some cases, the hose may burst.

In order to prevent the above drawbacks, a structure has been proposed in which a flexible metal reinforcing material such as steel cord, metal silver, or metal chain is embedded in the rubber elastic body on the inner peripheral side of the sleeve hose. It does not exhibit sufficient tear and abrasion resistance, and the dredging and civil engineering construction industry is requesting that this be improved.

In response to the above-mentioned request, the present applicant has provided a plurality of metal rings each having an inner circumferential surface tapered in one direction in the axial direction within the rubber elastic body of the rubber tube. Utility Model Application No. 53-1168, which is a sleeve hose for dredging buried so that its surface protrudes above the inner peripheral surface of the rubber pipe body.
It was proposed in No. 09 (Utility Model Application Publication No. 55-34075).

In the hose of this invention, solid particles such as crushed coral stones contained in the fluid conveyed under high pressure collide with the tapered inner peripheral surface of the metal ring and bounce toward the center of the hose, being swept away by the high-pressure fluid. This protects the inner cylindrical rubber of the rubber tube from tearing and abrasion caused by coral crushing and the like.

The present invention provides a structure that can more reliably exhibit the effect of preventing the tearing and abrasion caused by the metal ring described above. The inner diameter of the rubber tubular body axially inward from the ring embedding position is larger than the inner diameter of the tubular body axially outward from the embedding position, with the ring as a boundary.

The present invention proposes a dredging sleeve hose structure that can effectively deal with tearing and abrasion damage as described above.

The present invention will be described below with reference to an illustrated example. In FIG. 1, a dredging sleeve hose according to the present invention is comprised of a rubber tube body 1 equipped with connecting fittings 2 and 2' at both ends.

The connecting fittings 2, 2' may be vulcanized and bonded to the rubber tube 1 as shown in the figure, or they may be tightened with metal belts from the outer circumferential surface of the tube 1 and attached to both ends of the tube when in use. The so-called band tightening type 0 type for fixing the connecting fittings 2, 2, as shown in FIG. It is also possible to reduce the weight of the entire hose by removing it.

The rubber tube 1 is embedded with a required number of reinforcing fabric layers 3 in a conventional manner.

Note that the above configuration is the same as that of a conventionally known hose.

According to the present invention, a plurality of metal rings 4, which have an inner circumferential surface 1a tapered in one direction in the axis XX direction, are provided inside the rubber elastic body on the inner circumferential surface side of the rubber tube body 1.・・・・・・
- is embedded in the inner circumferential surface 5 of each ring so as to protrude from the inner circumferential direction 1a of the rubber tube 1.

Each metal +) ring 4 has its large-diameter inner circumferential surface 5a on the same plane as the inner circumferential surface 1a of the rubber tube 1, or
a, and the small-diameter inner circumferential surface 5b necessarily projects higher than the large-diameter inner circumferential surface 5a above the inner circumferential surface 1a of the rubber tube 1. It is embedded within the rubber elastic body on the inner peripheral side of the rubber tube.

The rubber tube 1 in which a plurality of metal rings are embedded in the inner circumferential elastic body of the rubber tube 1 is located inward in the axis X-X direction from the buried position of the outermost metal ring 4a. As described above, the hose of the present invention, in which the inner diameter r1 is smaller than the inner diameter r2 axially outward from the buried position of the metal ring 4a, has a plurality of inner circumferences tapered in one direction in the axial direction. metal ring 4
. 15Ky/crA
) and solid substances such as crushed coral stones contained in the fluid flowing at high speed (approximately 5 to 8 m/5 ec) obliquely collide with the tapered inner circumferential surface of the metal ring 4 protruding from the inner circumferential surface of the tube body. In addition to being blown away toward the center of the tube body 1, it is also swept away by the high-pressure, high-speed fluid, and is prevented from directly colliding with the inner circumferential surface of the rubber tube body 1.

Further, according to the present invention, the inner diameter of the rubber tube body axially inward from the buried position of the outermost metal ring is smaller than the inner diameter of the rubber tube body axially outward from the buried small amount. The inner diameter of the tube body is said to be smaller than the inner diameter of the tube end, so
The solid particles swept away by the high-pressure, high-speed fluid first collide obliquely with the inner circumferential surface of the metal ring, and are reliably prevented from directly colliding with the inner circumferential surface of the rubber tube, thereby causing tearing and abrasion damage. is definitely prevented.

In addition, when implementing the present invention, the following various considerations should be made.

By embedding a plurality of metal rings in a rubber elastic body whose inner peripheral surface is on the inner peripheral surface side of the rubber tube, it is possible to create a space between the inner peripheral surface 1a of the rubber tube and the side surface 5c of the metal ring. In order to prevent a vortex flow of the carrier fluid from occurring at the right-angled corner and abrasion of the rubber elastic body at the corner, as shown in FIG. The inner circumferential surface can be formed in an inclined shape and can be made thick.

When a bending force is applied to the rubber tubular body 1, as shown in FIG. The areas where the buckling phenomenon occurs are violently torn and worn out by collisions with coral crushed stones, etc.

In order to prevent the occurrence of the buckling phenomenon that causes tearing and abrasion, the embedding distance 1 of the plurality of metal rings 4 is set to ■/1 with respect to the wall thickness t of the rubber tube 1. It is desirable that they be spaced apart with a relationship of ≦8.

The relationship between the buried distance 1 of the metal ring and the wall thickness t of the rubber tube was confirmed as a result of experiments by the present inventor, and is 1/
Buckling occurs when the value of l is 8 or more, and preferably 1/l≦6.

For details of this buckling prevention test, refer to the specification of Japanese Patent Application Laid-open No. 1043/1983, which is co-filed by the present applicant.

Further, by decreasing the value of 1/l and increasing the bending angle per unit length, the total length of the hose can be shortened, and thereby the weight of the hose can also be reduced.

As mentioned above, in addition to embedding a plurality of metal rings at appropriate intervals in the rubber elastic body on the inner peripheral surface side of the rubber tube, as shown in FIG. By forming the metal ring so that it is depressed 6 inward in the radial direction at the position where the metal ring is buried, when a bending force is applied to the rubber tube body, the depression 6 absorbs the compressive force that acts on the tube wall on the bending side. This can prevent the occurrence of buckling.

In addition, by forming the outer circumferential surface 7 of each metal song 4 into a concave groove shape and tightening the concave groove-shaped outer circumferential direction 7 with a wire 8 through the reinforcing cloth layer 3, the rubber elastic body around the metal ring can be temporarily tightened. Even if the ring is worn out, it can be prevented from falling off the rubber tube.

Furthermore, as shown in FIG. 6, the outer circumferential surface of the metal ring can be formed into a double-crested shape to further increase the contact area with the surrounding rubber elastic body and increase the adhesive force.

As described in detail above, the dredging sleeve hose according to the present invention has a rubber tube with connecting fittings at both ends, and a rubber tube tapered in one direction in the axial direction inside the rubber elastic body on the inner peripheral side. A plurality of metal rings each having an inner circumferential surface are buried so that the inner circumferential surface of each ring protrudes from the inner circumferential direction of the rubber tube, and an axis line is set from the buried position of the outermost metal ring of the rubber tube. Since the inner diameter in the axial direction is smaller than the inner diameter in the axial direction from the buried position of the outermost metal ring, solid particles such as crushed coral stones contained in the fluid conveyed under high pressure in the direction of the arrow in the figure are The rubber ring collides with the slanted inner peripheral surface of the metal ring whose diameter decreases in one direction in the axial direction, and is swept away by the high-pressure fluid while jumping toward the center of the hose. There is no collision with the inner circumferential surface of the main body of the tube, thus preventing tearing and abrasion caused by coral crushed stones and the like.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the dredging sleeve hose according to the present invention.
2 to 4 are partial sectional views showing modified examples of the present invention, FIG. 5 is an explanatory view of the buckling phenomenon, and FIG. 6 is a partial sectional view showing the shape of a metal song according to another embodiment. . 1...Rubber pipe body, 2...Connection fittings,
3...Reinforcement cloth layer, 4...Metal ring,
5... Inner peripheral surface of the 4th group ring, 6... Recessed part of the rubber tube, 7... Concave groove-like outer circumference of the metal ring, 8... ··wire.

Claims (1)

[Scope of utility model registration request] A plurality of metal rings each having an inner circumferential surface tapered in one direction in the axial direction are installed inside the rubber elastic body on the inner circumferential surface side of a rubber tube body equipped with connecting fittings at both ends. A burying device for burying the outermost metal ring of the rubber tube so that the surface protrudes from the inner circumferential surface of the rubber tube and at an appropriate interval in the longitudinal direction of the rubber tube. A sleeve hose for dredging, characterized in that an inner diameter further axially inward is smaller than an inner diameter axially outward from the outermost metal ring embedding position.