JP6049264B2 - High pressure hose - Google Patents

Description

  The present invention relates to a high-pressure hose, and particularly to a high-pressure hose provided with a pressure-resistant layer.

  Conventionally, in the structure of a high-pressure hose, a metal wire is wound around the inner tube rubber layer in a spiral shape (spiral winding) without a gap, or a wire is wound around the inner tube rubber layer in a blade shape (lattice knitting), or these are Some of them are combined to form a reinforcing layer by overlapping a plurality of layers to form a high-pressure hose (for example, see Patent Document 1).

  Further, there is a configuration in which four spiral reinforcing layers are wound around the outer side of the inner tube rubber layer to form an internal pressure bearing layer, and a platy reinforcing layer is provided on the outer side to form a tensile load bearing layer.

  Moreover, the example of the said patent document 1 becomes an internal pressure burden layer between the center cloth affixed on the inner tube | pipe rubber layer, and the outermost outer layer rubber layer so that an inner tube | pipe rubber layer may not be deformed. There is one in which a spiral reinforcing layer is wound, and a reinforcing layer serving as a tensile load bearing layer is further formed on the outer side.

  At this time, the steel wire winding angles αa to αd of the four spiral reinforcing layers serving as the inner pressure bearing layer are set to 103 ° to 120, which is the same as that of the conventional general-purpose hose, and the outer two layers serving as the tensile load bearing layer. The steel wire winding angles αe and αf of the spiral reinforcing layers 116e and 116f are set to 90 ° to 103 ° so that the winding angle of the tensile load bearing layer is smaller than the minimum winding angle of the inner pressure bearing layer. Is set to

  However, in the above configuration, the relationship from the knitting angle αa to αd of the four inner spiral reinforcing layers serving as the inner pressure bearing layer is αa <αb <αc <αd, and the knitting angle αa of the innermost layer is set to be small. Therefore, when the hose is bent or when the hose is pulled, the wire may bite into the inner tube layer, which may cause internal fluid leakage.

  Further, in such a high pressure hose, the cause of αa <αb <αc <αd is that when the wire winding device is used, if the pitch of the arranged wires is wound around the high pressure hose, the inner side (small diameter) This is because the knitting angle α becomes smaller (α is smaller), and the outer layer in which the diameter of the high-pressure hose increases as the wrapping of the reinforcing layer (wire layer) advances and the knitting angle α increases (α is larger).

  In addition, when the structure of the pressure-resistant layer (inner 4 layers) and the tensile strength layer (outer 2 layers) are different as in the above example, two types of braided structures of blade (outer 2 layers) and spiral (inner 4 layers) Since it is used for a high-pressure hose, it is necessary to pass through a wire knitting machine several times at the time of manufacturing the high-pressure hose, resulting in poor production efficiency. Furthermore, since the tensile strength layer and the adhesive layer have a braided structure, it is difficult to use a thick wire due to restrictions on the wire diameter, and it is difficult to obtain sufficient strength. In particular, in an environment where the hose is easily worn during use, such as a water jet hose used in a pile driver, the strength is not sufficient.

JP 2001-032966 A

  The present invention has been made in consideration of the above-mentioned problems, and aims to provide a high-pressure hose that has good productivity, excellent high-pressure resistance, high tensile strength, and hardly damages an inner pipe when pulled. To do.

The high-pressure hose according to claim 1 includes an inner tube rubber layer that constitutes a fluid passage, a fiber layer that is provided outside the inner tube rubber layer, an outer coat layer that constitutes an outermost layer, and the fiber layer. Even layers of four or more layers are provided between the outer cover layer, and when the knitting angle α is set to αa, αb, αc, αd... Sequentially from the inner tube rubber layer side, αa >αb>αc> It is characterized by comprising a reinforcing layer made of a steel wire that becomes αd and an intermediate rubber layer disposed between the reinforcing layers.

In the invention of the above configuration, the knitting angle α is smaller (sleeping) as the outer two layers of the reinforcing layers adjacent to each other (hereinafter referred to as “crossing layers”) are crossed, and the influence of the tensile force is the most. The intersecting layer to be received is in the outermost layer (= the braiding angle α is small). At this time, among the reinforcing layers constituting each cross layer, the inner knitting angle α _in is the same as or larger than the outer knitting angle α _out . By adopting such a configuration, even when a force (reduced diameter) in the inner diameter direction is applied to the reinforcing layer due to the extension of the outermost layer, the inner wire layer can prevent the diameter reduction. It is possible to prevent the inner tube rubber layer from being damaged by the above, and to exhibit a high tensile strength. Moreover, even if the outermost one or two layers are ruptured due to an injury, the tensile strength can be prevented from greatly decreasing because the reinforcing layer becomes the outermost layer in order of decreasing angle. In the present specification, the braided angle α of the reinforcing layer means an acute angle among the angles formed by the center line when the high-pressure hose is straightened and the reinforcing layer wound on the fiber layer.

  The high-pressure hose according to claim 2 is provided with six reinforcing layers, and when the reinforcing layers are an inner layer, an intermediate layer, and an outer layer, respectively, in order from the inner side, the average braiding angle α of the intermediate layer α2 is closer to the average α3 of the knitting angle α of the outer layer than the average α1 of the knitting angle α of the inner layer.

  In the invention of the above configuration, since the average of the knitting angle α of the intermediate layer is closer to the average of the knitting angle α of the outer layer than the average of the knitting angle α of the inner layer, the intermediate layer is larger as a tensile load bearing layer. Tensile strength can be expected.

  The high-pressure hose according to claim 3 is provided with six reinforcing layers, and when the reinforcing layers are an inner layer, an intermediate layer, and an outer layer, respectively, in order from the inner side, the average braiding angle α of the intermediate layer α2 is closer to the average α1 of the knitting angle α of the inner layer than the average α3 of the knitting angle α of the outer layer.

  In the invention of the above configuration, since the average of the knitting angle α of the intermediate layer is closer to the average of the knitting angle α of the inner layer than the average of the knitting angle α of the outer layer, the intermediate layer is larger as the inner pressure bearing layer. The pressure resistance can be expected.

  The high-pressure hose according to claim 4 includes six reinforcing layers, and when the braided angle α of the reinforcing layers is αa, αb, αc,... Sequentially from the inner tube rubber layer side, αb−αc> αd-αe> αc-αd.

  In the invention of the above configuration, the knitting angles αc and αd of the third and fourth reinforcing layers from the inside are closer to the knitting angle αe of the fifth reinforcing layer from the inside than the knitting angle αb of the second reinforcing layer from the inside. Therefore, the third and fourth reinforcing layers from the inside can be expected to have a higher tensile strength as a tensile load bearing layer.

  The high-pressure hose according to claim 5 includes six reinforcing layers, and when the braided angle α of the reinforcing layers is αa, αb, αc,... Sequentially from the inner tube rubber layer side, αd−αe> αb-αc> αc-αd.

  In the invention of the above configuration, the knitting angles αc and αd of the third and fourth reinforcing layers from the inside are closer to the knitting angle αb of the second reinforcing layer from the inside than the knitting angles αe of the fifth reinforcing layer from the inside. Therefore, the third and fourth reinforcing layers from the inside can be expected to have a greater pressure resistance as an internal pressure bearing layer.

  The high-pressure hose according to claim 6 is characterized in that a knitting angle α of two outermost layers among the reinforcing layers is 30 ° <α <50 °.

  In the invention of the above configuration, the braided angle of the two outermost reinforcing layers is less than 30 ° to prevent the wire from being remarkably lowered in flexibility, and if it exceeds 50 °, the non-stretch property is impaired. It can prevent that the tensile force falls. In addition, for example, when a device or equipment to which a high-pressure hose is connected is movable, the hose length is set so that the distance between one connecting portion of the hose and the device and the other connecting portion can be expanded and contracted. When the distance is shortened, the hose is bent, and the hose may be easily damaged by bending locally. According to the invention having the above-described configuration, the braided angle of the two outermost reinforcing layers becomes a small angle of less than 50 °, so that the bending resistance is improved, and damage due to local bending of the hose can be prevented. .

  The high-pressure hose according to claim 7 is characterized in that the range of the knitting angle αa of the innermost reinforcing layer is 53 ° <αa <56 °.

  In the invention with the above-described configuration, the braided angle αa of the innermost reinforcing layer is greatly separated from the static angle (54.7 °), and therefore it is easy to be affected by the internal pressure, thereby preventing a situation in which deformation is likely to occur. .

  The high-pressure hose according to claim 8 is used for a water jet of a pile driver.

In the invention having the above-described configuration, even if the hose is worn from the outer layer when it is inserted into the ground and used, a layer having a small braiding angle is sequentially present on the inner side, so that a significant decrease in tensile strength can be prevented.
The high-pressure hose according to claim 9, wherein the reinforcing layer is formed in a state in which the steel wire is wound spirally. .

  As described above, according to the present invention, a high-pressure hose having good productivity, excellent high-pressure resistance, high tensile strength, and hardly damaging the inner tube during pulling can be obtained.

1 is a side view of a high-pressure hose according to a first embodiment of the present invention. It is the front view and side view which show the wire winding process of the high voltage | pressure hose which concerns on this invention. It is a table | surface which shows an example of the item of the high pressure hose which concerns on this invention. It is a table | surface which shows the relationship between the braiding angle of the outermost layer of the high-pressure hose which concerns on this invention, and performance. It is a table | surface which shows the relationship between the braiding angle and performance of the innermost layer of the high-pressure hose which concerns on this invention.

  Hereinafter, the high pressure hose 10 according to the first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 shows a laminated structure example of a hydraulic hose according to an embodiment of the present invention. In the example of FIG. 1, the fiber layer 14, the intermediate rubber layers 17a to 17e, the reinforcing layers 16a to 16f, and the outer rubber layer 18 are sequentially formed on the inner tube rubber layer 12, and the outer layer is formed on the outer reinforcing layer 16f. A rubber layer 18 is formed. Hereinafter, each layer will be described.

[Inner tube rubber layer]

  The inner tube rubber layer 12 is preferably selected in consideration of oil resistance, heat resistance, setability and the like. That is, it is preferable that the inner tube rubber layer 12 has a function of supporting internal pressure and suppressing permeation of an oil-based fluid or the like.

  As the rubber material constituting the inner tube rubber layer 12, nitrile rubber (NBR), styrene butadiene rubber (SBR), butadiene rubber (BR), chloroprene rubber (CR), natural rubber (NR), ethylene propylene diene rubber ( EPDM) and the like can be appropriately combined, and in some cases, can be used alone. In addition, compounding agents such as commonly used processing aids, antioxidants, vulcanizing agents, reinforcing agents, and vulcanization accelerators can be appropriately added to the above materials.

  As the other material of the inner tube rubber layer 12, a resin material can be used, and a resin material considering versatility, strength, etc. is preferable, PA (polyamide) of nylon 6, 11 and 12, PE (polyethylene), Examples thereof include POM (polyoxymethylene) engineering plastics, PEEK, polyester, and composite materials thereof. Of course, various additives or the like may be used to improve the material strength. In particular, in the case of a highly crystalline resin such as POM, the effect is noticeable.

  The thickness of the inner tube rubber layer 12 is preferably in the range of 1.0 to 3.0 mm, for example, and can be appropriately selected in consideration of the outer diameter of the hose, workability, and the like.

  A fiber layer 14 is formed on the outer side of the inner tube rubber layer 12. The fiber layer 14 is provided to protect the inner tube rubber layer 12 when the reinforcing layer 16 is wound, and a material such as PET can be used.

  Moreover, what is shown in FIG. 2 can also be mentioned as a structural example of the high pressure hose 10 concerning this invention. That is, the fiber layer 14, the reinforcing layer 16 + the intermediate rubber layer 17, and the outer rubber layer 18 are sequentially formed on the inner tube rubber layer 12.

[Reinforcing layer]

  For example, in the embodiment shown in FIG. 1, the reinforcing layer 16 has a six-layer structure in which an intermediate rubber layer 17 is provided between the reinforcing layers 16. Or an eight-layer structure. The reinforcing layer 16 is made of a metal linear object, for example, a wire 42, and the linear object is provided on the fiber layer 14 and the intermediate rubber layer 17 by alternately intersecting and spirally wound.

  The material of the metal linear object (wire 42) used for the reinforcing layer 16 is not particularly limited, but preferably a metal wire, for example, a hard steel wire with brass plating, a stainless steel wire, or galvanization. It is preferable to use a known metal wire or the like.

  As described above, the reinforcing layer 16 is formed of a plurality of layers of four or more layers. The number of layers is preferably determined appropriately according to the pressure of the fluid applied to the inner tube rubber layer 12 during use, that is, the internal pressure applied to the high-pressure hose 10. The configuration of the individual layers in the reinforcing layer 16 in this case is a configuration (spiral configuration) in which metal wires 42 are alternately wound in a spiral manner as shown in FIG. The number of metal linear objects (wires 42) depends on the density and wire diameter of the linear objects, the diameter of the high-pressure hose 10 and the configuration of the reinforcing layer 16, but preferably 3 to 10 and 100 in total. Wrap up to 200.

  Further, as described above, in the configuration according to the present invention, the reinforcing layer 16 has a spiral structure of linear objects all the way to the outermost layer located inside the outer covering rubber layer 18, and a platy reinforcement like the conventional one. The layer is not used. For this reason, productivity is better compared to the conventional structure that uses two types of braided structure of blade and spiral for one high-pressure hose, and there is less restriction on the thickness of the linear object used. There is an advantage that the degree of freedom in design is improved.

[Intermediate rubber layer]

  The intermediate rubber layer 17 has a function as a cushioning material that shows durability against a fluid that permeates the inner tube rubber layer 12 and prevents the reinforcing layers 16 from being rubbed. As the rubber material constituting the intermediate rubber layer 17, the same material as that of the inner tube rubber layer 12 can be used.

[Coating rubber layer]

  The outer rubber layer 18 covering the surface of the reinforcing layer is optional, but it is preferable that the outer rubber layer 18 is formed of a resin material such as polyethylene or a rubber material having oil resistance, weather resistance, and wear resistance. Note that this is not necessarily the case if a jacket is not required.

[Production method]

  The manufacturing process of the high-pressure hose 10 formed by laminating the inner tube rubber layer 12, the fiber layer 14, the intermediate rubber layer 17, the reinforcing layer 16 and the outer rubber layer 18 is particularly a wire spiral hose (reinforcing layer) as in this embodiment. The hose in which 16 wires 42 are spirally wound (spiral configuration) is preferably subjected to steam vulcanization in which steam is vulcanized at 130 to 160 ° C. while being covered with a cloth in the final vulcanization step.

[Restriction of braiding angle α]

  In general, in a wire-reinforced high-pressure hose, the reinforcing layer 16 is braided at an angle close to a static angle (54.7 ° as a braid half angle) as a whole. For example, when the reinforcing layer 16 is formed by stacking the reinforcing layer 16a that is the inner layer and the reinforcing layer 16b that is the outer layer, the average braiding angle, that is, the center line when the high-pressure hose 10 is straightened, The angle formed by the braided reinforcing layer is close to the stationary angle.

  The stationary angle here is an angle at which the reinforcing layer 16 equally distributes pressure in the longitudinal direction and the radial direction of the high-pressure hose 10 when an internal pressure load is generated, and the braided angle α may be larger than the stationary angle. Even when it is small, the entire high-pressure hose 10 is deformed so that the braiding angle α of each reinforcing layer 16 approaches the stationary angle.

  For example, when the knitting angle α is larger than the stationary angle, the high pressure hose 10 tends to extend in the length direction due to the internal pressure load, and when the knitting angle α is smaller than the stationary angle, the high pressure hose 10 tends to contract in the length direction. .

  In addition, the outer layer has a knitting angle α larger than the stationary angle, and the knitting angle α, which is an average of these, is close to the stationary angle. For this reason, the knitting angle α of each layer cannot select a value that deviates much from the static angle of 54.7 degrees. As a result, the setting of the knitting angle α such that αa <αb <αc <αd is generally limited to α = 52 degrees at least.

  Further, reinforcement layers 116e and 116f are provided outside the reinforcing layer 116 where αa <αb <αc <αd, and in a configuration where αa <αb <αc <αd> αe> αf, the outermost two layers are knitted. Since the angle α can be reduced, the reinforcing layer 116 that bears a tensile load can obtain a tensile strength effect and a collapse prevention effect during bending and tension. However, in order to sufficiently reduce αe and αf, it is necessary to set a large angle difference with αd, and there is a possibility that the intermediate rubber layer may be damaged between the reinforcing layers 116d / 116e when the hose is bent or when the hose is pulled. .

[Setting of knitting angle α in the present invention]

  As shown in FIGS. 1 and 3, the high-pressure hose 10 according to the present invention includes four or more reinforcing layers 16, and the knitting angle α is αa ≧ αb> αc ≧ αd from the inside (FIG. 3). “WS layer” in the “Name” column of FIG.

The reinforcing layer 16 is provided so as to exhibit pressure resistance and tensile strength with a set of two spiral reinforcing layers (intersecting layers) knitted in an intersecting manner. In the present invention, since the braided angles αa and αb of the reinforcing layers constituting the innermost first intersecting layer are larger than those of the other outer intersecting layers, when the high-pressure hose 10 is bent or in the length direction When the high-pressure hose 10 is pulled, the wire 42 of the reinforcing layer 16a bites into the inner tube rubber layer 12, and there is little possibility that the inner tube rubber layer 12 is damaged or internal fluid leaks. At this time, the inner knitting angle α _in of the two reinforcing layers constituting each cross layer is equal to or larger than the outer knitting angle α _out .

  That is, when bending and pulling, the wire 42 of the reinforcing layer 16 is deformed in the direction of reducing the diameter. However, if the braiding angle α is large, the elongation in the length direction is large, but the diameter is small. The effect of biting in can be reduced.

  On the contrary, since the knitting angle α is small in the outer intersecting layer, the wire 42 of the reinforcing layer 16 is deformed in the direction in which the diameter of the reinforcing layer 16 is reduced at the time of bending and pulling. However, there is little possibility of directly interfering with the inner tube rubber layer 12, damaging it or causing leakage of the internal fluid. In addition, since the braiding angle α is small, the reinforcing layer 16 that bears the tensile load can obtain a tensile strength effect and a collapse prevention effect at the time of bending and pulling.

Further, when α _in > α _out , unless otherwise specified, it is desirable that the intervals between the braiding angles αa to αd of the reinforcing layer 16 be as equal as possible. That is, when the difference in the braiding angle α between the reinforcing layers 16a, 16b,... Is small, twisting occurs when the high-pressure hose 10 is deformed by internal pressure or tensile force, and the reinforcing layers 16 are broken or misaligned. Is less likely to occur.

On the other hand, when α _in = α _out, that is, αa = αb> αc = αd, when the braiding angle α is set, twisting of the high-pressure hose 10 can be prevented when the hose is bent or the hose is pulled.

  Further, when six reinforcing layers 16 are provided, the knitting angle α of the reinforcing layers 16c and 16d of the middle two layers, that is, the second intersecting layer (intermediate layer) is set to the inner first intersecting layer (inner layer). By selecting whether the angle is close to the reinforcing layers 16a and 16b or the angle close to the reinforcing layers 16e and 16f of the outer third intersecting layer (outer layer), the intermediate second intersecting layer is intentionally selected. That is, the role of the reinforcing layers 16c and 16d can be set to either the tensile load bearing layer or the internal pressure bearing layer.

  That is, if the knitting angles αc and αd of the reinforcing layers 16c and 16d are brought close to the knitting angles αe and αf of the outer reinforcing layer, a greater tensile strength can be expected as the tensile load bearing layer. Specifically, when the braiding angle α of the reinforcing layer 16 is set to αa, αb, αc,... Sequentially from the inside, the reinforcing layer 16c can be obtained by setting αb-αc> αd-αe> αc-αd. 16d can be expected to have a function close to the outermost reinforcing layers 16e and 16f.

For example, in the example shown in FIG. 3, α1 = 54.6 °, α2 = 54.2 °, α3 = 44.9 °, α4 = 44.6 °, α5 = 35.2 °, and α6 = 35.1 °, so (44.6-35.2)> ( 54.2-44.9) > (44.9-44.6), and the reinforcing layers 16c and 16d can be expected to function closer to the inner reinforcing layers 16a and 16b than the outermost reinforcing layers 16e and 16f .

  Alternatively, the above relationship may be defined by taking an average of the braiding angles α of the reinforcing layers constituting the intersecting layer and comparing the adjacent intersecting layers such as the reinforcing layers 16a and 16b and 16c and 16d. For example, in the example shown in FIG. 3, the average of αc and αd is 44.75, and is closer to 35.15 which is the average of αe and αf than 54.4 which is the average of αa and αb. A function closer to the outermost third intersection layer can be expected.

  Further, when the knitting angles αc and αd of the reinforcing layer of the second intersecting layer are brought closer to the knitting angles αa and αb of the reinforcing layer of the first first intersecting layer, a higher pressure resistance is expected as an internal pressure bearing layer. Can do. Specifically, when the braiding angle α of the reinforcing layer 16 is set to αa, αb, αc,... In order from the inside, the second intersecting layer can be obtained by setting αd−αe> αb-αc> αc-αd. Can be expected to function close to the innermost first intersecting layer. Of course, this can also be applied to the case where the reinforcing layer 16 has six or more layers, and the function is set closer to the tensile load bearing layer or closer to the inner pressure bearing layer depending on the setting of the knitting angle α. You can also

  Furthermore, in the conventional high-pressure hose, reinforcing layers 116e and 116f are provided outside the reinforcing layer 116 where αa <αb <αc <αd, and αa <αb <αc <αd> αe> αf. In order to sufficiently reduce αe and αf, it is necessary to set a large angle difference from αd, and there is a possibility that the intermediate rubber layer may be damaged between the reinforcing layers 116d / 116e when the hose is bent or when the hose is pulled. .

  In the present invention, the knitting angle α from the reinforcing layers 16a to 16f changes stepwise from αa to αf, so there is no need to increase the angle difference on the way, and the above-described adverse effects can be avoided. Here, “smallly changing in steps” means that (1) αa> αb> αc> αd> αe> αf, where the braiding angle α gradually decreases for each reinforcing layer, (2) αa = Αb> αc = αd> αe = αf, where the knitting angle α of the two reinforcing layers of each crossing layer is the same and gradually decreases for each crossing layer, or (3) αa = αb> αc> A case where both the above (1) and (2) are included, such as αd> αe = αf.

[Setting of knitting angle α of outermost two layers]

  The high-pressure hose 10 according to the second embodiment of the present application is characterized in that the braiding angle α of the outermost two layers (outermost intersecting layers) of the reinforcing layers 16 is 30 ° <α <50 °. .

  As shown in FIG. 4, the braiding angle of the two reinforcing layers 16 constituting the outermost intersecting layer is less than 30 °, so that the flexibility of the wire is remarkably lowered and the pressure resistance performance of the non-stretch layer is also achieved. Very low. Further, if it exceeds 50 °, the non-stretch property is impaired, and the tensile strength is reduced. Therefore, the above problem can be prevented by setting the knitting angle α of the two layers constituting the outermost intersecting layer of the reinforcing layer 16 to 30 ° <α <50 °.

[Setting of knitting angle α of innermost two layers]

  The high-pressure hose 10 according to the third embodiment of the present application is characterized in that the knitting angle αa of the two innermost layers (innermost intersecting layer) of the reinforcing layers 16 is 53 ° <αa <56 °. And

  As shown in FIG. 5, the braided angle of the reinforcing layer 16 constituting the innermost crossing layer is greatly separated from the static angle (54.7 °), so that it is easily affected by the internal pressure, and as a result, deformation is likely to occur. . Therefore, by setting the range of the braiding angle of the two layers constituting the innermost intersecting layer of the reinforcing layers 16 to 53 ° <αa <56 °, deformation of the high-pressure hose 10 is prevented when an internal pressure is applied. be able to.

[Winding process]

  The concept of the wire winding apparatus 200 used for the wire winding process of the high-pressure hose according to the embodiment of the present invention is shown as an example in FIG. As shown in FIG. 1, the wire winding device 200 is used to form a reinforcing layer 16 of wires 42 for reinforcement in the high-pressure hose 10 that is a final product.

  The high-pressure hose 10 has a rubber inner tube rubber layer 12 and a fiber layer 14 on the outer side thereof, and a wire 42 is wound around the fiber layer 14 by a wire winding device 200 so that the reinforcing layer 16 is wound. Is formed. An intermediate rubber layer is provided between the reinforcing layers 16, and the outermost reinforcing layer 15 is covered with a rubber outer rubber layer 18.

  As shown in FIG. 2B, the wire winding device 200 has a cylindrical mandrel 220. The inner tube rubber layer 12 is pushed out of the mandrel 220, and the mandrel 220 is inserted into the center hole of the inner tube rubber layer 12. Thereby, in the process of manufacturing the high-pressure hose 10, the inner tube rubber layer 12 can be stably supported.

  Furthermore, the wire winding device 200 has a rotating disk 240. The rotating disk 240 is formed in a substantially columnar shape or a substantially cylindrical shape, and a passage hole 260 is formed in the center in the axial direction so as to penetrate from one end to the other end in the axial direction. The inner tube rubber layer 12 supported by the mandrel 220 passes through the passage hole 260 in the arrow L direction. The rotating disk 24 is rotated at a constant angular velocity in the circumferential direction (arrow A direction) by a rotation driving device (not shown).

  The rotating disk 240 has a predetermined thickness in the axial direction (the same direction as the arrow L direction). As shown in FIGS. 2A and 2B, a plurality of support pins 320 (only one is shown for convenience in FIG. 2B) are arranged on the rotating disk 240 so as to extend in the tangential direction. Yes.

  A bobbin 340 is attached to each of the support pins 320. The bobbin 340 is formed in a cylindrical shape, and a wire 42 to be wound around the inner tube rubber layer 12 is wound in advance at a predetermined pitch on the outer periphery thereof. The support pin 320 is inserted into the insertion hole 344 at the center of the bobbin 340, and the bobbin 340 is mounted at a predetermined position on the outer peripheral surface 280 of the rotating disk 240. Therefore, the plurality of bobbins 340 are also supported radially on the outer peripheral surface 280 of the rotating disk 240 in the same manner as the support pins 320.

  While the inner tube rubber layer 12 supported by the mandrel 220 is passed through the passage hole 260 of the rotation disc 240, the rotation disc 240 is rotated in the circumferential direction (arrow A direction) to surround the inner tube rubber layer 12. The wire 42 is wound around the wire. Thus, as shown in FIG. 1, the reinforcing layer 16 in which the wire 42 is knitted is formed around the inner tube rubber layer 12.

  In FIG. 2 (B), in the direction of arrow L, a sheet-like rubber winding device (not shown) for forming the intermediate rubber layer 17 and another wire winding device 200 (not shown) are provided. Then, when the high-pressure hose 10 being processed on which the reinforcing layer 16 is formed passes, a new reinforcing layer 16 is provided on the outer side of the intermediate rubber layer 17 and the high-pressure hose 10. At that time, by reversing the winding direction of the wire 42, the reinforcing layers 16 can be formed with alternately braided angles as shown in FIG.

  At this time, the diameter of the high-pressure hose 10 increases as the reinforcing layer 16 made of the wires 42 is formed in order from the inside, and the braiding angle α gradually increases unless the pitch of the wires 42 is changed. In the present invention, the outer reinforcing layer 16 is configured so that the braiding angle α is smaller, and when the wire winding process is performed again by the wire winding device 200 after the formation of one reinforcing layer 16, It is necessary to widen the pitch of 42 and lay the wire 42 (with the knitting angle α decreased) to perform the winding operation. That is, if the pitch of the wire 42 is set larger as the wire is wound on the reinforcing layers 16a, 16b, and 16c and the inner tube rubber layer 12, the braiding angle α can be reduced.

  The high-pressure hose 10 according to each of the above embodiments can be suitably used for, for example, a pile driving machine used for civil engineering work. As an example, in the case of a pile driving machine in which a water jet nozzle is provided in the vicinity of the tip of the pile in order to reduce the penetration resistance of the pile, the hose reaching the water jet nozzle is easily damaged due to friction with earth and sand. Here, if the high-pressure hose 10 according to the present invention is used, even if the outermost one or two layers including the reinforcing layer 16 are broken due to a wound, the reinforcing layer 16 becomes the outermost layer in order of increasing braiding angle α. Therefore, it is possible to prevent the tensile strength from greatly decreasing and to reliably collect the nozzle.

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. For example, the reinforcing layer 16 is not limited to four or six layers, and may be eight or more layers.

DESCRIPTION OF SYMBOLS 10 High pressure hose 12 Inner tube rubber layer 14 Fiber layer 16 Reinforcement layer 17 Intermediate rubber layer 18 Outer rubber layer 42 Wire

Claims (9)

An inner tube rubber layer constituting a fluid passage;
A fiber layer provided outside the inner tube rubber layer;
A jacket layer constituting the outermost layer;
When four or more even layers are provided between the fiber layer and the jacket layer, and the braiding angle α of the steel wire is set to αa, αb, αc, αd,... Sequentially from the inner tube rubber layer side. , Αa>αb>αc> αd...
An intermediate rubber layer disposed between each of the reinforcing layers;
A high-pressure hose characterized by comprising:   When the six reinforcing layers are provided and the reinforcing layers are two layers in order from the inside, the inner layer, the intermediate layer, and the outer layer, the average α2 of the knitting angle α of the intermediate layer is equal to the knitting angle α of the inner layer. The high-pressure hose according to claim 1, wherein the high-pressure hose is closer to an average α3 of a braiding angle α of the outer layer than an average α1.   When six reinforcing layers are provided and two reinforcing layers are formed in order from the inside, and the reinforcing layer is an inner layer, an intermediate layer, and an outer layer, the average α2 of the knitting angle α of the intermediate layer is equal to the knitting angle α of the outer layer. The high-pressure hose according to claim 1, wherein the high-pressure hose is closer to an average α1 of a braiding angle α of the inner layer than an average α3.   When six reinforcing layers are provided and the braided angle α of the reinforcing layers is αa, αb, αc,... In order from the inner tube rubber layer side, αb-αc> αd-αe> αc-αd. The high-pressure hose according to claim 1.   When six reinforcing layers are provided and the braided angle α of the reinforcing layers is αa, αb, αc,... In order from the inner tube rubber layer side, αd−αe> αb−αc> αc−αd. The high-pressure hose according to claim 1.   6. The high-pressure hose according to claim 1, wherein a braiding angle α of the outermost two layers of the reinforcing layers is 30 ° <α <50 °.   The high-pressure hose according to any one of claims 1 to 6, wherein a range of the braiding angle αa of the innermost two layers of the reinforcing layers is 53 ° <αa <56 °.   The high-pressure hose according to any one of claims 1 to 7, which is used for a water jet for a pile driver.   The high-pressure hose according to any one of claims 1 to 8, wherein the reinforcing layer is formed in a state where the steel wire is spirally wound.