JPH02235725A - Reinforced hose and manufacture thereof - Google Patents

Abstract

PURPOSE: To provide a hose which is highly resistant to a rupture by making reinforcing fibers for a high pressure hose almost square-shaped in cross section. CONSTITUTION: Fiber or wire 4 with a cross section of almost square shape to be used is the drawn synthetic fiber or the machine carbon steel and the surface of these materials has adhesive properties to an elastic material or a resin material to be embedded. When the wire 4 of almost square shape is used, each piece of the wire 4 is arranged in such a way that the individual pieces are brought into tight contact with each other. Therefore, even when an irregularly arranged part of the wire 4 is present, these pieces of the wire 4 are formed as an integrally bonded partition wall, that is, the opposed lateral edges 5 of the adjacent pieces of the wound wire 4 are tightly bonded together, so that this part of the wire 4 never rotates around the longitudinal axis of the wire 4. Conversely, a deformation to be generated in the wire 4 is such a deformation to be caused by the migration of the described part of the wire 4 along the edges 5 against a shear resistance between the edges 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reinforced hose. More particularly, the present invention relates to high pressure hoses made of elastic or resinous materials reinforced with fibrous materials, such as steel wire.

[Conventional technology] High pressure hoses reinforced with fibers have been known for a long time.

The reinforcing layer of the hose may be knitted into a sleeve or spirally wound into the wall of the hose. In addition, published German patent application No. 1930589 uses a flattened circular wire to reduce the number of frictional contact points between adjacent wires of the wound wire per unit length of the hose. What is disclosed is disclosed. This circular wire is formed by a roll into a substantially rectangular cross-section, and this cross-sectional shape has two mutually parallel flat sides and two convex end surfaces. Although such a hose has reduced frictional contacts between the longitudinal edges of the wire, the resistance to bursting at these contacts is not improved.

[Problems to be Solved by the Invention] An object of the present invention is to improve the above-mentioned defects in conventional wire- or fiber-reinforced hoses and to provide a reinforced hose with high resistance to bursting.

[Means for Solving the Problems and Their Effects] In order to achieve the above object, the present invention uses reinforcing fibers having a substantially square cross-sectional shape.

The mutually opposing longitudinal side edges of the wound or braided fibers are arranged substantially parallel.

Further, the method of the present invention simultaneously supplies a plurality of wires with circular or substantially circular cross sections to form them into square cross sections, and forms strips in which these square cross section wires are arranged in parallel. Such strips are directly sent to the hose manufacturing process.

EXAMPLE FIG. 1 shows a longitudinal section of a part of a wall 1 of a conventional hose, in which a plurality of flat wires 2 are embedded. The wire 2 is roll-formed to have a substantially rectangular cross-section, and the cross-section has two planar side surfaces and two convex end surfaces. When such a hose is manufactured, if an uneven portion occurs in the winding of the reinforcing wire 2, a weak portion 3 is generated at this portion. If we apply a test pressure inside this hose, this test pressure is close to the design bursting pressure, so this test pressure is much higher than the normal working pressure, especially in the above weak part in such a case, Larger deformation occurs locally than in other parts. Therefore, early cracks and damage occur in the walls of this hose.

In contrast, according to the embodiment of the present invention as shown in FIG. 2, even if there is some irregularity within the wall of the hose, the above-mentioned danger or damage to the wall of the hose does not occur. . That is, in the case of such substantially square fibers or wires 4, these wires are arranged in close contact with each other, so that even if there are irregular weak points, these wires are formed as an integral partition wall. That is, the opposite side edges 5 of adjacent wires of the wound wire are in close contact with each other, so that no portion of the wire rotates about the longitudinal axis of the wire. Conversely, the only deformation that occurs in this wire 4 is such that a portion of this wire moves along the edges 5 against the shear resistance between these edges 5.

The fibers or wires 4 having a substantially square cross section are made of pultruded synthetic fibers or mechanically processed carbon steel, and their surfaces have adhesive properties to the elastic or resin material to be embedded. have.

In this specification, a substantially square cross-sectional shape includes squares and squares with rounded corners, and also rectangles (with rounded corners) whose width to height is 80% to 120%. Miyoi) is also included.

Furthermore, shapes having a rounded top or bottom surface 8 and parallel planar side edges 7, such as the cross-sectional shape 6 shown in FIG. 3, are also included in this expression of substantially square. .

In these configurations, the planar edges 7 of adjacent fibers or wires abut each other. Further, the diamond-shaped cross-sectional shape 9 is also equivalent to this square cross-sectional shape.

When using a steel wire with a substantially square cross section, the wire with a circular cross section is mechanically deformed, such as by rolling, into a substantially square cross section. In this case, it is preferable to arrange a plurality of wires having circular cross sections in parallel (that is, form them into wire strips) and simultaneously deform them so that they are continuously deformed into a substantially square shape. The series of wires thus deformed are wound onto a spool 10 as strips 11 parallel to each other and closely spaced, as shown in FIG.

FIG. 5 shows an apparatus for carrying out the process of continuously and simultaneously deforming a wire strip as described above. A plurality of wires 12 are supplied from a plurality of spools 13, and these wires are guided in parallel and closely to each other into a slot-shaped opening 17, which is a portion where the outer peripheral surfaces of the rollers 14, 15, 16 abut. This is an opening formed between the two.

These wires having circular cross sections are compressed together when passing through the opening 17, and their cross sections are transformed into a substantially square shape with rounded corners. Then, this wire strip 11 having a square cross section is wound onto a single spool 10 as shown in FIG. This strip consists of 2 to 12 wires. It is also preferred that the strip consists of an even number of wires. These truncated conical rollers 14, 15.1
The plurality of wires fed out from 6 may be wound onto separate spools.

If desired, the strip thus formed may not be wound onto the spool 10, but may be fed directly to the winding station of the hose manufacturing apparatus. In these cases, the wires may be reshaped from a circular cross-section to a roughly square cross-section in the hose manufacturing facility immediately before being wrapped or braided onto the inner tube of the hose wall to form a reinforcing layer. It will transform it. Alternatively, the wire 6 having two planar side surfaces 7 and two rounded edges 8 may be wound one by one onto a spool and supplied to a hose manufacturing factory. In such a case, a plurality of these wires 6 are pulled out from a plurality of spools and guided so that they are aligned in parallel so that their planar sides are in close contact with each other, as shown in FIG. Ru.

When aligning the wires in this way, the plurality of wires 6 are fed into an opening 17 formed between frustoconical rollers, and the rollers 16 move the wires in such a way that the planar sides 7 of the wires are in close contact with each other. line up. The rollers 14,15 also compress the rounded faces 8 of these wires, deforming them into a predetermined square cross-section.

Of course, the deformation ratio in this case is set empirically in relation to the cross-sectional dimensions and final shape of the wire.

Such a reinforced hose of the present invention includes at least one fiber layer, and this layer is formed by arranging fibers in a cylindrical shape in close contact with each other within the wall of the hose.

When a steel wire is used as the reinforcing fiber, the surface of the wire is coated with a layer of brass or the like to provide adhesion to the elastic material constituting the hose. In this case, it is preferred to provide an intermediate layer (for example nickel) between the surface of the steel wire and the brass coating to prevent stress corrosion. Further, if necessary, the brass coating may contain other components or may be further coated with another metal (for example, cobalt) to improve adhesion after thermal effects.

Also, using fibers similar to those disclosed in EP 200253, the burst release elongation can be increased by 4.5-6%.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a part of a conventional reinforced hose, FIG. 2 is a sectional view of a part of a reinforced hose according to an embodiment of the present invention, FIG. 3 is a diagram showing a square cross section of fibers, and FIG. This figure shows a spool of a wire strip, FIG. 5 is a schematic diagram of a wire strip manufacturing apparatus, and FIG. 6 is a view taken along the line Vl--Vl in FIG. 5.

Claims (7)

[Claims] (1) A reinforcing fiber for a high-pressure hose, characterized by having a substantially square cross-sectional shape (4). (2) The reinforcing fiber according to claim 1, wherein the reinforcing fiber is a high carbon steel wire, and the surface of the reinforcing fiber is coated with a surface layer that increases adhesion to an elastic material. (3) The reinforcing fiber according to claim 2, wherein the steel wire (4) is a wire having a circular or substantially circular cross section that is mechanically deformed to have a substantially square cross section. (4) A hose (1) reinforced with at least one layer consisting of the fibers (4) according to claim 1, wherein the fibers (4) are provided spirally wound within the wall of the hose. A hose characterized by being arranged in close contact with each other. (5) A hose (1) reinforced with at least one layer of fibers (4) according to claim 1, characterized in that the fibers (4) are braided into a sleeve. hose. (6) A method for continuously manufacturing a wire strip (11) consisting of a wire (4) with a substantially square cross section, comprising: a) supplying a series of wires (12) with a circular or substantially circular cross section; b) simultaneously mechanically deforming said wire (12) into said rectangular cross-section; c) placing said deformed series of wires close together on a spool (10) in strips (11); A method comprising a step of winding it into a shape. (7) A method for reinforcing a hose (1), comprising the step of unwinding a plurality of wire strips (11) formed by the method according to claim 6 from a plurality of spools (10);
It is characterized by comprising the steps of spirally winding these wire strips (11) on the inner cylindrical elastic material layer of the hose, and the step of bringing the wires of these strips into close contact with each other during this winding step. Method.