JP2010144808A - Flexible pressure resistance-wearproof hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible pressure resistance-wearproof hose which reduces weight and improve wear resistance and durability. <P>SOLUTION: The hose is equipped with a soft body part 2 roughly flat in inner surface and a spiral hard core material part 3 provided in an outer surface or the inside of the soft body part 2 for reinforcing this soft body part 2, wherein the hard core material part 3 consists of a hard synthesis resin or a metal wire, and the soft body part 2 consists of a durable thermoplastic elastomer. When the hard core material part 3 consists of the metal wire, the metal wire is desirable to be a coated wire in which the periphery of the metal wire is coated by the thermoplastic elastomer layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flexible pressure-resistant and wear-resistant hose that is excellent in weight reduction and durability and has improved wear resistance.

  Factory, ship, shipyard, civil engineering work site, vacuum conveyor hose for environmental conservation and shooter, suction hoses for slurry, sintered cement, gravel, iron ore, etc., grains such as fir, rice and wheat A hose used as a suction feeding hose must be lightweight and flexible, and must have excellent pressure resistance and wear resistance. Conventionally, as shown in FIG. 3, this type of hose has a hard core portion 103 made of hard synthetic resin such as hard vinyl chloride with respect to a rubber soft main body portion 102 (peripheral wall portion) having a substantially flat inner surface. There is provided a flexible pressure-resistant and wear-resistant hose 101 in which (reinforcing material) is integrally embedded and fixedly held in a state where the outer peripheral portion of the reinforcing material is exposed to the outside or completely buried (Patent Document). 1 and 2).

  Such a soft rubber body 102 made of rubber has higher wear resistance than that of a synthetic resin, but it is heavier and requires weight reduction from the viewpoint of improving workability during transportation and construction. . Further, there is a limit to the adhesiveness between the rubber soft main body 102 and the synthetic resin hard core 103. Furthermore, since the rubber soft main body 102 has a large amount of wear depending on the material to be circulated, further improvement in wear resistance and durability has been demanded.

JP 55-44896 JP-A-60-151491

  Therefore, in view of the above-described situation, the present invention is to provide a flexible pressure / wear resistant hose that can be reduced in weight and can further improve wear resistance and durability.

  In order to solve the above-mentioned problems, the present invention provides a soft main body portion whose inner surface is substantially flat, and a helical hard core portion provided on the outer surface or inside of the soft main body portion to reinforce the soft main body portion. A flexible pressure-resistant hose comprising: a flexible core characterized in that the hard core portion is made of a hard synthetic resin or a metal wire, and the soft main body portion is made of a wear-resistant thermoplastic elastomer. A pressure and wear resistant hose was constructed.

  Here, the hard core member is preferably a covered wire in which the periphery of the metal wire is covered with a thermoplastic elastomer layer, but may be a bare wire made of a metal wire.

  According to the flexible pressure-resistant and wear-resistant hose according to the present invention as described above, the soft main body is made of a wear-resistant thermoplastic elastomer, so that the weight can be reduced compared to the conventional rubber one (specific gravity). And is reduced in weight by about 5 to 30%.), And workability (handling) during transportation and construction can be improved. In addition, when the hard core part is a hard synthetic resin, or when the outer surface of the metal wire is covered with a resin or elastomer, the adhesion between the hard core part and the soft main body part is good, and excellent durability is achieved. Show. Furthermore, compared with the conventional rubber wear-resistant hose, the soft main body according to the present invention has a markedly improved wear resistance, extending the product life and expanding the application. In particular, if the hard core portion is made of a metal wire, an antistatic effect can be obtained. It is also possible to check the internal distribution state as a transparent main body that cannot be made with conventional rubber.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a partially broken side view showing a first embodiment of a flexible pressure / wear resistant hose according to the present invention, FIG. 2 shows a second embodiment, and reference numeral 1 in the drawing denotes a flexible pressure resistant hose. A wear-resistant hose, 2 indicates a soft main body portion, and 3 indicates a hard core portion.

  As shown in FIG. 1, the flexible pressure resistant / wear resistant hose 1 of the present invention includes a soft main body 2 having a substantially flat inner surface and an outer surface of the soft main body 2 for reinforcing the soft main body 2. Or a spiral hard core part 3 provided inside, the hard core part 3 is made of a hard synthetic resin or a metal wire, and the soft main body part 2 is made of an abrasion-resistant thermoplastic elastomer. It is a feature.

  As the wear-resistant thermoplastic elastomer, for example, a mixture containing a water-added polystyrene-based thermoplastic elastomer and a polyolefin-based resin, a polyurethane-based thermoplastic elastomer, a polyamide-based elastomer, a polyester-based elastomer, or the like can be used. As the hydrogenated polystyrene-based thermoplastic elastomer, a styrene-ethylene butylene-styrene block copolymer or the like can be used, and as the polyolefin resin to be mixed, a polypropylene resin or a polyethylene resin can be used.

  As shown in FIG. 1, a flexible pressure / wear resistant hose 1 according to the first embodiment has a hard core material made of a hard synthetic resin on the outer surface of a soft main body portion 2 made of a wear-resistant thermoplastic elastomer. The part 3 is attached spirally. Specifically, the linear hard core material constituting the hard core material part 3 and the thermoplastic elastomer tape constituting the soft main body part 2 are integrally spiraled. The side end portions of the adjacent tapes that are wound around each other are heat-welded and formed into a cylindrical shape as a whole.

  The hard synthetic resin constituting the hard core part 3 is made of a hard synthetic resin such as polyvinyl chloride resin or polyolefin resin, and is preferably a polyolefin resin from the viewpoint of preventing generation of harmful gas during incineration. Resin, polyethylene resin, and the like can be used. Moreover, what added the powdery or fibrous filler for reinforcement is more preferable. Moreover, in this example, the metal ground wire 4 such as a steel wire or a copper wire is spirally provided along the central portion of the bottom surface of the hard core portion 3, and expansion to the outside of the hose can be suppressed. At the same time, it has an antistatic effect. Of course, such a ground wire 4 can be omitted.

  Next, a second embodiment of the present invention will be described based on FIG.

  In the flexible pressure resistant / wear resistant hose 1 according to the present embodiment, the hard core part 3 is made of a metal wire, and the hard core part 3 made of the metal wire is composed of two layers of the inner and outer layers constituting the soft main body part 2. The structure is sandwiched between wear-resistant thermoplastic elastomer tapes 20 and 21. A steel wire, a copper wire, etc. can be used for a metal wire, and it will have an antistatic effect by providing such a metal wire. The hard core portion 3 may be a bare wire made of only a metal wire, but in this example, it is a covered wire in which the outer peripheral surface of the metal wire 30 is covered with a thermoplastic elastomer layer 31. By setting it as such a covered wire, the thermoplastic elastomer layer 31 has compatibility with the inner and outer tapes 20 and 21 which are also made of a thermoplastic elastomer, and the adhesiveness is improved.

  Such a hose is formed by forming a cylindrical shape by extruding and adhering the metal wire (covered wire) 3 onto the inner tape 20 at the same time, and heat-sealing adjacent side ends of the tape 20. Further, the outer tape 21 is continuously extruded and placed on the metal wire 3 and pressed by a pressing roller, whereby the portion covering the metal wire 3 is heat-sealed to the metal wire 3 and the tape 20 so as to protrude. At the same time, the side ends are also heat-sealed to form a cylindrical hose in which the metal wire 3 is sandwiched between the inner and outer tapes 20 and 21 as a whole.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

  Next, the flexible pressure / wear resistant hose according to the present invention described in FIG. 1 (Example 1) and the conventional rubber flexible pressure / wear resistant hose described in FIG. 3 (Comparative Example 1) The results of the wear resistance test will be described.

  Test specimens of the innermost layer (soft body portion) of each hose of Example 1 and Comparative Example 1 were produced, and a dry wear resistance test was performed on each specimen. In the test, metal powder was sprayed on the surface of the test specimen, and the time until the surface was worn by 1 mm was measured, and both Example 1 and Comparative Example 1 were performed several times.

  From the results of Table 1 above, the flexible pressure / wear resistant hose of Example 1 according to the present invention is three times as large as the conventional rubber flexible pressure / wear resistant hose of Comparative Example 1. It turns out that it has near abrasion resistance.

The partially broken side view which shows the flexible pressure | voltage resistant and wear-resistant hose which concerns on 1st Embodiment of this invention. The partially broken side view which shows the flexible pressure | voltage resistant and wear-resistant hose which concerns on 2nd Embodiment of this invention. The partially broken side view which shows the conventional flexible pressure | voltage resistant and oil-resistant hose made from rubber | gum.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible pressure resistant / wear resistant hose 2 Soft main body part 3 Hard core part 4 Ground wire 20, 21 Thermoplastic elastomer tape 30 Metal wire 31 Thermoplastic elastomer layer 101 Flexible pressure resistant / wear resistant hose 102 Soft main body part 103 Hard core part

Claims (2)

  In a flexible pressure-resistant hose comprising a soft main body portion whose inner surface is substantially flat and a helical hard core portion provided on the outer surface or inside of the soft main body portion to reinforce the soft main body portion, A flexible pressure-resistant and wear-resistant hose characterized in that the hard core portion is made of a hard synthetic resin or a metal wire, and the soft main body portion is made of an abrasion-resistant thermoplastic elastomer.   The flexible pressure-resistant / abrasion-resistant hose according to claim 1, wherein the hard core portion is a covered wire in which a metal wire is covered with a thermoplastic elastomer layer.

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