JPH0765703B2 - Hose with built-in wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a hose having an electric wire built therein as a signal cable.

[Conventional technology]

2. Description of the Related Art Conventionally, a hose having an electric wire embedded therein has been known because it is used for the purpose of signal transmission as well as the original purpose of the hose.

Such a hose with a built-in electric wire is used, for example, in a car wash device, a coating device, etc., in which a hand operation part such as a washing nozzle or a painting nozzle is attached to one end, and the other end is connected to the main body of the washing machine or the painting machine. Therefore, the operator can operate the motor and the like of the apparatus main body by the hand operation unit while holding one end of the hose at a place away from the apparatus main body.

However, the conventional general hose with a built-in electric wire has a structure in which the electric wire is spirally wound around the outer circumference of an ordinary rubber hose (which may include a reinforcing layer), and the outer circumference is covered with a heat shrink tube made of synthetic resin. , Spiral protrusions are generated on the outer circumference,
This convex part catches the equipment and hinders the movement of the hose, and it hinders the winding on the reel etc.In addition, the convex part is worn or worn in the case where it is routed over concrete such as a car wash hose. There was a defect that it was easily damaged.

In order to eliminate irregularities on the outer peripheral surface as much as possible, insert an electric wire into the outer circumference of the inner rubber layer or the reinforcing layer provided on the outer circumference, and after applying the outer rubber layer on it, vulcanize the whole and put it inside the rubber hose. It is conceivable to embed the electric wire, but there was a drawback that the electric wire deteriorates due to heat during vulcanization.

In addition, the conventional hose with a built-in wire has poor flexibility because it uses a normal copper or aluminum single wire or stranded wire as an electric wire, and the hose's original flexibility is impaired by embedding the wire, or the hose bends or expands or contracts. As a result, a heavy load is repeatedly applied to the electric wire, and the electric wire is fatigued and easily breaks.

[Problems to be Solved by the Invention]

In view of such conventional circumstances, the present invention embeds an electric wire inside without causing thermal deterioration of the electric wire and without causing irregularities on the outer peripheral surface, and the embedded electric wire does not impair the flexibility of the hose and bends or expands or contracts. It is an object of the present invention to provide a hose with a built-in electric wire that does not break following the above.

[Means for Solving the Problems]

In order to achieve the above object, the hose with a built-in electric wire of the present invention,
A vulcanized rubber, a synthetic resin or a thermoplastic elastomer inner surface layer having a circular cross-section, an outer circumference of the inner surface layer or an electric wire linearly extended along the length direction on the outer circumference of a reinforcing layer provided on the outer circumference, and an inner surface layer or The outer layer of a circular cross section made of a thermoplastic elastomer is provided on the outer periphery of the reinforcing layer so that the center is eccentric with the center of the inner layer so as to become thicker along the wire, and the heat forming the outer layer of the wire. It is characterized by comprising a synthetic resin core having flexibility equal to or higher than that of a plastic elastomer, and a metal conductor spirally wound around the outer periphery of the core.

In order to facilitate the handling of the electric wire, a metal conductor may be adhered to the core with an adhesive or the like, and on the metal conductor wound around the outer periphery of the core, the same as the core or the thermoplastic elastomer of the outer surface layer, or It is also possible to previously form a coating layer made of synthetic resin having flexibility higher than that. In particular, an electric wire having a coating layer has an advantage that the outer surface layer can be extruded at the same time when the electric wire is constructed by using a crosshead or the like, so that it can be manufactured extremely efficiently.

[Action]

In the present invention, as an electric wire to be embedded in a hose, an electric wire having a special structure in which a metal conductor is spirally wound around an outer circumference of a synthetic resin core is used. The core of the electric wire is made of synthetic resin such as polyurethane or polyethylene terephthalate having flexibility equal to or higher than that of the thermoplastic elastomer of the outer surface layer in which the electric wire is embedded, and a single wire such as copper or aluminum around the core. Alternatively, a metal conductor made of a stranded wire or a foil is wound in a spiral shape.

Therefore, since this wire has sufficient flexibility, elasticity, and bending resistance, it does not impair the flexibility of the hose when it is buried, and the embedding direction is a straight line along the length of the hose. Even so, the electric wire can sufficiently follow the severe bending and expansion / contraction of the hose, and does not break even if these loads are repeatedly applied.

Further, as the outer surface layer for embedding the electric wire, a thermoplastic elastomer such as polyolefin or polystyrene which can obtain various properties similar to vulcanized rubber without vulcanization is used. Can be omitted, and thermal deterioration of the electric wire due to heating for a long time can be prevented.

Moreover, both the outer peripheral surface and the inner peripheral surface of the hose have a circular cross section, but since the electric wire is embedded in the thick portion generated by eccentricizing the both, the outer peripheral surface of the hose becomes smooth without unevenness. Therefore, there is no hindrance to the winding and handling of the hose, and it is possible to prevent local abrasion and damage even when the hose is drawn around the concrete.

Incidentally, in the production of the hose with a built-in electric wire of the present invention, the inner surface layer of the vulcanized rubber is sent out, or the inner surface layer of the synthetic resin or the thermoplastic elastomer is extruded, and if necessary, the fiber or steel wire is attached to the outer periphery of the inner surface layer. Form a reinforcing layer consisting of the inner surface layer or the outer periphery of the reinforcing layer and extend the wire in a straight line along the length direction, and at the same time or after that, eccentric with the inner surface layer so that the wire portion becomes thick There is a method of extruding an outer surface layer made of a thermoplastic elastomer. It is also possible to first extrude unvulcanized rubber to form a reinforcing layer, then vulcanize it, then apply an electric wire in the same manner as above, and extrude the outer surface layer.

In the present invention, the number of embedded electric wires is not limited, and a composite type cable in which the above electric wires are combined with another signal cable or the like can be used instead of the above electric wires.

〔Example〕

As shown in FIG. 1, an NBR having an inner diameter of 6.3 mm was extruded as the inner surface layer 2 of the hose 1 with a built-in electric wire, and the outer periphery thereof had a diameter of 0.2 mm.
The reinforcing wire 3 was formed by braiding the piano wire of No. 6 in the number of driving 6 × 24, and vulcanized at 150 ° C. for 60 minutes to cure the inner surface layer 2.

On the other hand, the electric wire 4 shown in FIG. 2 (Mobilon telescopic electric wire M6 / 4 manufactured by Yoshinogawa Electric Cable Co., Ltd.) was prepared. This electric wire 4 has a thickness of about 0.04 mm on the outer circumference of a core 6 made of polyurethane and having a diameter of 0.8 mm.
And four copper foils 7 with a width of 0.65 mm are lined up and spirally wound.
A polyurethane coating layer 8 having an outer diameter of 1.9 mm is formed on the outer side thereof, and the conductor resistance at 20 ° C. is 0.75 Ω / m.

Two of these electric wires 4 are aligned and linearly applied along the lengthwise direction on the reinforcing layer 3, while the outer layer 5 is made of a polyolefin thermoplastic elastomer [SANTOPLINE (trade name of Mitsubishi Monsanto Kasei Co., Ltd.)]. ] Was eccentric to the inner surface layer 2 and extrusion-molded, and an electric wire built-in hose 1 having an outer diameter of 14.0 mm was manufactured in which the electric wire 4 was embedded in the thick portion of the outer surface layer 5.

Next, the manufactured wire built-in hose 1 was subjected to a swing impulse test. Fix the other end of the hose on the extension line of one end of the hose in a direction orthogonal to the one end, and feed the test oil with an oil temperature of 90 ° C from the one end of the hose at a pressure of 140 kg x 150% and a pressurization cycle of 70 cpm while minimizing the bending radius of the hose. One end to the other end so that it is 50 mm at one end and 40 mm at the other end
It was moved back and forth at 20 cpm. There was no abnormality in the hose after shaking 500,000 times, and there was no change in the resistance value of the built-in wire 4 of 0.75 Ω / m.

Also, the repulsive force was measured when the built-in electric wire hose 1 was bent 180 ° with an inner radius of 35 mm, and compared with a hose similar to the built-in electric wire hose 1 except that the electric wire 4 was not buried, both were 310 g, There was no difference.

[Effects of the Invention] According to the present invention, an electric wire is embedded without causing thermal deterioration, and the embedded electric wire does not impair the flexibility of the hose, and does not break due to bending or expansion / contraction of the hose. In addition, it is possible to provide a hose with a built-in electric wire in which the amount of materials such as an electric wire and a thermoplastic elastomer used is small, and which has a circular cross section and a smooth outer peripheral surface.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one specific example of the electric wire built-in hose of the present invention, and FIG. 2 is a side view showing one specific example of the electric wire according to the present invention. 1 ... Hose with built-in electric wire, 2 ... Inner surface layer 3 ... Reinforcing layer, 4 ... Electric wire 5 ... Outer surface layer, 6 ... Core 7 ... Copper foil, 8 ... Covering layer

Claims (2)

[Claims] 1. An inner surface layer made of a vulcanized rubber, a synthetic resin or a thermoplastic elastomer and having a circular cross section, and an electric wire linearly extended along the length direction on the outer circumference of the inner surface layer or the outer circumference of a reinforcing layer provided on the outer circumference. And an outer surface layer having a circular cross section made of a thermoplastic elastomer, the center of which is eccentric with the center of the inner surface layer so as to become thicker along the electric wire on the outer periphery of the inner surface layer or the reinforcing layer, and the electric wire is A hose with a built-in electric wire, comprising a synthetic resin core having flexibility equal to or higher than that of a thermoplastic elastomer forming an outer surface layer, and a metal conductor spirally wound around the outer circumference of the core. 2. A cover layer made of a synthetic resin having flexibility equal to or higher than that of the thermoplastic elastomer of the outer surface layer is provided on the outer periphery of the metal conductor of the electric wire. Hose with a built-in electric wire as described.