JPH0565981A - Structure of large bore shorter flexible rubber hose - Google Patents

Abstract

PURPOSE:To absorb each force of compression and extension and even if a flexible angle is taken large enough, enable it to be smoothly curved by installing a protuberant part at the radial outside of a mounting bracket at the longitudinal inner end of a connecting mounting bracket with a steel pipe, while setting up a fiber cord layer, at a specified angle to the axial direction, at the radial outer side. CONSTITUTION:A mounting bracket 2 for a steel pipe is installed at both ends of inner tube rubber 1, and a protuberant part 3 is installed at the radial outer side of a mounting bracket at the longitudinal inner end of the mounting bracket 2. In addition, a fiber cord layer 4 angling at 70-90 degrees to a hose axial direction is locked the radial outer side of the inner tube rubber by means of a bead 5. Next, a soft rubber layer 6, a fiber cord layer 7 angling at 70-90 degrees to the hose axial direction and a soft rubber layer 8 are set up in order, and a reinforced ring 9 is embedded in this outermost rubber layer for constitution. With this constitution, even in the case where it is bent to the range of 30 degrees, an abnormal projection and one-sided wear will in no case occur there, thus it is fully usable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large diameter short flexible rubber hose (hereinafter referred to as a rubber hose). More specifically, the present invention relates to a rubber hose capable of obtaining a large flexing angle, which is used between a steel pipe for sucking water together with the sand and transporting the sand to the ship and the land when collecting the sand from the sea and rivers.

[0002]

2. Description of the Related Art Conventionally, in order to collect earth and sand from the seabed, a steel pipe and a rubber hose were connected from the seabed by a universal joint as shown in FIG. 4, and the connection was sequentially made depending on the depth of the seabed. And the rubber hose used between steel pipes is
It was a conventional sleep hose used at sea. This sleep hose had a general sleep hose and a spherical sleep hose. The allowable bending angle of the general sleep hose was 10 degrees, and that of the spherical sleep hose was 15 degrees. As shown in FIG. 5, this sleep hose is provided with fittings on rubber inner cylinders at both ends, and a fiber cord layer having a cord angle of 45 degrees to the hose axial direction is radially attached to the rubber layer of the inner cylinder by beads. It was fixed and provided with a hard rubber layer and a fiber coat layer with the same cord angle, a hard rubber layer was provided on the outside, and the rubber layer was reinforced and vulcanized with a spiral wire as necessary to manufacture. .. Further, in the past, in order to obtain a large flexibility, a corrugated joint shown in FIG. 6 has been used. Even in this case, the allowable bending angle was 10 degrees.

[0003]

However, in the conventional sleep hose, when it receives waves, the steel pipe, the connecting portion with the rubber hose and the rubber hose are subjected to compression and extension forces. It was unable to absorb the forces of compression and extension and, moreover, could not have a large flexion angle. In addition, since the corrugated and spool type pipe joints have concave portions on the inner surface, there is a drawback that abrasive fluid such as earth and sand accumulates in the concave portions, impairing flexibility, and the fluid causes uneven wear of the cavities of the concave portions. ..

The rubber hose of the present invention provides a rubber hose capable of absorbing the force of compression and extension and having a long flexing life in which the compression side of the inner surface rubber does not project so much at the time of flexing that a large flexing angle can be obtained. With the goal.

[0005]

As a result of various studies for solving the above-mentioned object, the present inventor has studied the structure and the structure in order to absorb the force of compression and extension of the rubber hose and to manufacture the rubber hose with a large flexible angle. Focusing on the material, in a rubber hose that is connected by a universal joint between steel pipes, mounting fittings for connecting to the steel pipe are provided at both ends of the inner tube rubber, and the mounting metal fitting at the inner end in the longitudinal direction rises outward in the radial direction. A portion is provided, and a fiber cord layer having an angle of 70 to 90 degrees with respect to the hose axial direction is fixed to the outer side of the inner tube rubber in the radial direction with a bead, and a soft rubber layer, 70 with respect to the hose axial direction.
The problem was solved by sequentially disposing a fiber cord layer having an angle of ˜90 degrees and a soft rubber layer, and using a rubber hose in which a reinforcing ring was embedded in this rubber layer.

This rubber hose will be described. The inner tube rubber is made of rubber that is abrasion resistant to the soil that contains the sucked water. By mounting fittings for connecting to the steel pipe on both ends of the inner tube rubber, and by providing a raised portion on the outer side in the radial direction of the fitting at the inner end in the longitudinal direction, the bead is fixed and the bending action by wave compression and extension At times, it easily follows, and it is possible to prevent peeling of the adhesive interface due to bending action and prevention of rubber breakage. Next, a fiber cord layer having an angle of 70 to 90 degrees with respect to the hose axial direction is provided on the outer side in the radial direction. At this angle, it is easy to bend because it is 70 to 90 degrees with respect to the axial direction of the hose against the force of compression and extension. If this angle is less than 70 degrees, it is difficult to bend and the use of the rubber hose is restricted.

Next, the soft rubber layer is provided to improve the flexibility of the rubber hose as described above. The physical properties of this rubber are those whose critical elongation is much higher than that of conventionally used rubber. Next, 7 for the hose axial direction
A fiber coat layer having an angle of 0 to 90 degrees is provided. This is to make it easier to bend like the fiber cord layer 5 described above.
Next, a soft rubber layer is provided. This is also to make it easy to bend. A reinforcing ring is embedded in this soft rubber layer. This is mainly to reinforce the rubber hose itself against suction.

Next, regarding the method of manufacturing the rubber hose of the present invention, it can be manufactured by the same method as that of the conventional sleeve hose. The inner tube rubber is placed on the mandrel, and the fittings for connecting to both ends are placed. The fiber coat layer is folded back and fixed by the bead on the protruding portion at the end of the fitting. A soft rubber layer is placed on top of this, then a fiber cord layer is placed, then a soft rubber layer is placed, a reinforcing ring is embedded in this part, and vulcanization is performed to remove the mandrel and produce the product. To do.

[0009]

[Function] By providing a raised portion on the outer side in the radial direction of the mounting metal fitting at the inner end in the longitudinal direction of the mounting metal fitting for connection with the steel pipe, the bead is fixed and at the same time, it is possible to easily follow the bending motion due to the wave. Prevents peeling of the adhesive interface and breakage of rubber. 7 for hose axial direction
A 0 to 90 degree fiber cord layer and soft rubber are used to facilitate bending. Then, a reinforcing ring is provided on the outermost soft rubber layer to reinforce the rubber hose.

[0010]

The present invention will be described in detail with reference to FIG. In a rubber hose connected between steel pipes by a universal joint, mounting fittings 2 for the steel pipe are provided at both ends of the inner tube rubber 1, and a raised portion 3 is provided at a radially inner side of the mounting fitting at an inner end in the longitudinal direction of the mounting fitting 2. , The fiber cord layer 4 at an angle of 70 to 90 degrees with respect to the hose axis direction is fixed to the outer side of the inner tube rubber in the radial direction by the bead 5, and the soft rubber layer 6 and 70 to 90 degrees with respect to the hose axis direction. This is a rubber hose in which an angled fiber cord layer 7 and a soft rubber layer 8 are sequentially arranged, and a reinforcing ring 9 is embedded in the outermost rubber layer.

2 and 3 show how the rubber hose of the present invention and the conventional rubber hose are bent when a force is applied at a bending angle of 20 and 30 degrees. According to this, the present invention can be sufficiently used even when bent at 30 degrees as shown in FIG. The conventional rubber hose has an abnormal protrusion even at an angle of 20 degrees as shown in FIG. 2 and causes uneven wear, so that it cannot be used.

[0012]

EFFECTS OF THE INVENTION The rubber hose of the present invention having the above-mentioned structure can absorb the force of compression and extension due to waves, can have a large flexing angle, and at the time of flexing, the compression side of the inner rubber does not rise so much. The rubber hose that smoothly bends has a longer life.

[0013]

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view in the longitudinal direction of a rubber hose of the present invention.

FIG. 2 is a partial cross-sectional view in the longitudinal direction when the bending angle of a portion connected using a conventional rubber hose is 20 degrees.

FIG. 3 is a partial cross-sectional view in the longitudinal direction when the bending angle of the portion connected using the rubber hose of the present invention is 30 degrees.

FIG. 4 is a state diagram in which a conventional rubber hose and a steel pipe are connected and used by a universal joint.

FIG. 5 is a partial cross-sectional view in the longitudinal direction of a conventional sleep hose.

FIG. 6 is a partial cross-sectional view in the longitudinal direction of a conventional corrugated pipe joint.

[Explanation of symbols]

 1 Inner tube rubber 2 Mounting bracket for connection 3 Raised part of mounting bracket for connection 4 Code layer 5 Bead 6 Soft rubber layer 7 Code layer 8 Soft rubber layer 9 Reinforcement ring

Claims (1)

[Claims] 1. A large-diameter short flexible rubber hose connected between steel pipes by a universal joint, wherein mounting fittings for connection with the steel pipe are provided at both ends of the inner tube rubber, and the inner ends in the longitudinal direction and the radius of the mounting fittings. Protrusions are provided on the outer side in the radial direction, and 7 on the outer side in the radial direction of the inner tube rubber in the axial direction of the hose
A fiber cord layer having an angle of 0 to 90 degrees is fixed by a bead, and a soft rubber layer, a fiber cord layer having an angle of 70 to 90 degrees with respect to the hose axial direction, and a soft rubber layer are sequentially arranged. Structure of a large-diameter short flexible rubber hose characterized in that a reinforcing ring is embedded in the rubber layer.