JPH0514070Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to an ultra-wear resistant rubber hose that has a buried ceramic layer within the inner rubber layer. Concerning technical means for prevention.

(Conventional technology) Traditionally, rubber hoses have been used to transport metal powder, grains,
Sand and other various powders and lumps are transported by air or in the form of liquid slurry. The rubber hose used for this purpose must have an extremely wear-resistant inner surface, and for this reason, it is necessary to form a ceramic buried layer with excellent wear resistance on the inner surface of the rubber hose. is being carried out. FIGS. 4 and 5 show an example thereof. To specifically explain these super wear-resistant rubber hoses, in FIG. 4, 100 is an outer rubber layer, 102 is a reinforcing layer, and 10
4 is an inner rubber layer, and within this inner rubber layer 104 is formed a ceramic buried layer 108 consisting of a large number of ceramic balls 106. Reference numeral 110 denotes a metal fitting fixed to the end of the hose, with a cylindrical portion 112 embedded and fixed inside a rubber layer, and a flange 114 bolted to a flange of a mating pipe.

On the other hand, in the rubber hose shown in FIG. 5, the hose main body is composed of an outer rubber layer 116, a reinforcing layer 118, and an inner rubber layer 120, like the hose shown in FIG. A buried ceramic layer 124 consisting of spheres 122 is formed. In addition, there is a thick tightening part 1 at the end.
26 is formed, and this tightening portion 126 is bolted to a flange of a mating pipe by a split flange 128.

(Problem to be solved by the invention) By the way, when the end of these rubber hoses is connected to a mating pipe with a bolt, the inner rubber layer partially protrudes inward, as shown in Figure 6, and there is a A step (corner) may occur.

This step only occurs, for example, when a new hose is connected to a mating pipe that has already been used for a certain period of time and whose inner diameter has expanded due to inner wear.

When such a step occurs, the fluid conveyed inside the hose hits the step and applies an impact load. As a result, local wear in this area becomes severe, resulting in partial breakage, and in some cases, the inner ceramic sphere may fall off from the inner rubber layer. Once a ceramic sphere falls off, subsequent ceramic spheres become more likely to fall off, and such falling off of the ceramic spheres progresses in a chain reaction.

Furthermore, at the end of the inner rubber layer that is connected to the mating pipe, as shown in Figure 7, the tightening force of the bolts causes a part of the stepped portion to bulge inward, resulting in distortion, and this causes a disturbance in the arrangement of the ceramic balls, exacerbating the localized damage and the tendency for the ceramic balls to fall off.

(Means for solving the problem) The super wear-resistant rubber hose of the present invention was devised to solve the above problem, and its gist is that the inner rubber hose is formed along the axial direction of the hose. In a super wear-resistant rubber hose of the type in which a buried ceramic layer consisting of a large number of ceramic pieces is formed within the layer and is connected to a mating pipe via a flange arranged at the end, the ceramic pieces are flexible. They are connected to each other by wire rods and are wound in a spiral shape and are embedded in the inner rubber layer along the axial direction of the hose, and are continuously connected to the inner rubber layer at the end of the hose and of the flange. A rubber layer is extended and formed outward in the direction perpendicular to the axis along the front surface, and within the extended rubber layer, ceramic pieces are connected to each other by flexible wires, and the ceramic pieces extend in the axial direction of the hose. It is buried in a state where it is continuously wound in a spiral shape outward in the direction perpendicular to the axis.

(Function and effect of the invention) As described above, in the super wear-resistant rubber hose of the present invention, the ceramic buried layer is extended and formed in the direction perpendicular to the axis along the front surface of the flange at the end of the hose, unlike the conventional super wear-resistant rubber hose. Unlike the wear-resistant rubber hose, the buried ceramic layer does not end at the stepped portion. In other words, the end of the buried ceramic layer is not located at such a stepped portion, and in addition, in the present invention, each ceramic piece is connected to each other by a flexible wire, so the ceramic piece covers the stepped portion on the inner surface of the hose. At the same time, wear and tear are prevented, and the ceramic pieces themselves are also prevented from falling off.

In addition, in the present invention, each ceramic piece is connected with a flexible wire and wound spirally along the axial direction of the hose to form a buried ceramic layer in the hose body, and also to form a buried ceramic layer in the hose body. The ceramic piece is spirally wound outward in the direction perpendicular to the axis to form a buried ceramic layer in the direction perpendicular to the axis. It has the feature that it can be easily formed continuously on the ceramic buried layer.

The ceramic pieces connected by flexible wires are wound spirally in the axial direction at the end of the hose, and are continuously wound in a spiral manner outward in the direction perpendicular to the axis. This is because it is possible to form a ceramic buried layer in the direction perpendicular to the axis.

(Example) Next, an example of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, reference numeral 10 is an ultra-wear-resistant rubber hose with a circular cross section as an example of the present invention, which has an outer rubber layer 12, a reinforcing layer 14, and an inner rubber layer 16. A ceramic buried layer 20 is formed inside the hose 16 and includes a large number of ceramic balls 18 and extends in the axial direction of the hose. As shown in FIG. 3, these ceramic balls 18 are connected to each other in a bead-like manner without gaps by flexible wire rods 22, and are spirally wound along the axial direction of the hose.

In FIG. 2, a metal fitting 24 has a cylindrical portion 26 and a flange 28, and the cylindrical portion 26 is embedded and fixed inside the rubber layer. Further, as shown in FIG. 1, the flange 28 has bolt holes 30 formed at four locations in the circumferential direction, and is configured to be fastened to the flange of a mating pipe through bolts.

From the inner rubber layer 16, a rubber layer is extended outward in the radial direction of the hose at its end to form a rising rubber section 16a that covers the front surface of the flange 28 of the fitting 24 (the rubber material of the rising rubber section 16a is inner rubber). (The layer 16 may be different from the layer 16), and a through hole 32 is formed in the raised rubber portion 16a at a location corresponding to the bolt hole 30.

In addition to forming an extension of the rising rubber portion 16a,
The buried ceramic layer 20 is continued outward in the radial direction at the end of the hose, forming a disk-shaped buried ceramic layer 20a within the rising rubber portion 16a.

In this ceramic buried layer 20a, ceramic balls 18 are connected by flexible wires 22 and wound in a spiral shape.

In the rubber hose 10 having such a structure,
The buried ceramic layer 20a arranged on the front side of the flange 28 while connected to each other by the flexible wire 22 serves as a protective layer, thereby preventing the inner end of the inner rubber layer 20 from being worn out or damaged. . Further, the ceramic balls 18 are connected by a flexible wire 22, and the ceramic buried layer 2
Because the end of 0a is located a certain distance radially outward from the inner circumferential end of the inner rubber layer 16 that forms the step, that is, the end of the ceramic buried layer 20 is not located at such a step. Even if the impact force of the fluid acts from the lateral direction on the stepped portion of the inner rubber layer 16, the ceramic ball 18 will not fall off.

Although the embodiments of the present invention have been described in detail above, the present invention can also be configured in other forms.

For example, it is desirable that the ceramic pieces have a spherical shape as described above, but they may have other shapes.Also, in the above example, these ceramic pieces are connected without any gaps, but there may be some gaps between them. It doesn't matter if there are gaps.

Furthermore, in the above example, the flanged metal fitting is integrally fixed to the hose body, but the present invention can also be applied to a type of rubber hose in which the metal fitting is not integrally fixed to the rubber hose, such as the conventional rubber hose shown in Fig. 5. It is possible to apply

Also, the rising rubber part formed by extending from the inner rubber layer does not necessarily have to cover the entire front surface of the flange, and similarly, the extension distance of the buried ceramic layer on the front surface of the flange can be made different from the above example. The present invention may be modified in various ways without departing from the spirit thereof.

[Brief explanation of the drawing]

1 and 2 are a partially cutaway front view and a side sectional view of a main part of an ultra-wear resistant rubber hose that is an embodiment of the present invention, and FIG. 3 shows the ceramics embedded in FIGS. FIG. 2 is a cross-sectional view of a main part showing how ceramic spheres are connected in a layer. Figures 4 and 5 are sectional views of essential parts of an example of a conventional ultra-wear resistant rubber hose, and Figures 6 and 7 are explanatory diagrams for explaining problems with the same ultra-wear resistant rubber hose. be. DESCRIPTION OF SYMBOLS 10...Super wear-resistant rubber hose, 16...Internal rubber layer, 16a...Rising rubber portion, 18...Ceramics bulb, 20, 20a...Ceramics buried layer, 22...Wire rod, 28...Flange.

Claims (1)

[Claims for Utility Model Registration] A ceramic buried layer consisting of a large number of ceramic pieces is formed within the inner rubber layer formed along the axial direction of the hose, and is connected to the mating pipe via a flange arranged at the end. In the super wear-resistant rubber hose of the type, the ceramic pieces are connected to each other by flexible wire rods and are spirally wound and embedded in the inner rubber layer along the axial direction of the hose. Continuing with the inner rubber layer, a rubber layer is extended and formed outward in the direction perpendicular to the axis at the end of the hose and along the front surface of the flange, and a piece of ceramic can be inserted into the extended rubber layer. A ceramic buried layer connected to each other by flexible wires and embedded in a state where the ceramic pieces are wound spirally outward in a direction perpendicular to the axis and are continuous to the ceramic pieces extending in the axial direction of the hose. Super wear-resistant rubber hose with