JP4383586B2 - High pressure rubber hose for construction and civil engineering machinery - Google Patents

Description

【００３１】
なお、上記表１において、曲げ力は、比較例１＞比較例３＞実施例１＞実施例２＞比較例２の順になっているのは、引張り荷重負担層の巻付け角度によるものである。
【００３２】
また、従来例２（汎用ホース）が実施例１，実施例２，比較例２よりも曲げ力が大きいのは、４Ｗ／Ｓと５Ｗ／Ｓ、５Ｗ／Ｓと６Ｗ／Ｓ間の層間ゴムの厚さが実施例１，実施例２，比較例２よりも薄いからである。つまり、従来例２の層間ゴムの厚さは0.2 mm、他のホースは0.6 mmである。
【００３３】
また、以下の表２は、リール巻き高圧ホースの内圧力負担層の巻付け角度、引張り荷重負担層の巻付け角度を一定に設定し、層間ゴムの厚さを変えた場合の実験例を示している。
【００３４】
【表２】

【００３５】
なお、上記表２において、比較例２では、実施例１，２に比べて曲げ力が小さいのは、引張り荷重負担層の層間ゴムの厚さが厚くなっているからである。
【００３６】
【発明の効果】
以上のように、この発明では内面ゴム層(2) と外面ゴム層(4) との間に、層間ゴム層(5a),(5b) を介して複数の鋼線スパイラル補強層(12a,12b,12c,12d,13a,13b) を介在させて構成して成る高圧ゴムホース(1a)であって、前記鋼線スパイラル補強層(12a,12b,12c,12d,13a,13b) の内面ゴム層(2) 側の二層以上を偶数層の内圧力負担層となる鋼線スパイラル補強層(12a,12b,12c,12d) で構成すると共に、その外周の少なくとも二層以上を偶数層の引張り荷重負担層となる鋼線スパイラル補強層(13a,13b) で構成し、前記引張り荷重負担層の巻付け角度 (αf ) を、前記内圧力負担層の巻付け角度 (αa ) よりも小さく（αa ＞αf ）設定し、前記鋼線スパイラル補強層(12a,12b,12c,12d) の各鋼線巻付け角度（α_a 〜α_d ）を、内圧力負担層から引張り荷重負担層に向かって順次大きくなる（α_a ＜α_b ＜α_c ＜α_d ）ように構成し、前記引張り荷重負担層の巻付け角度(αf ) を、内圧力負担層の最小巻付け角度 (αa ) より小さい４９．７°〜５１．４°に設定したので、高圧に耐えることが出来ると共に、耐引張り力が大きく金具端末部での破損を有効に防止でき、柔軟性に富んだ高圧ゴムホースとすることが出来る効果がある。
【図面の簡単な説明】
【図１】この発明を実施したリール巻き高圧ホースの補強構造を示す一部切欠した正面図である。
【図２】従来の汎用高圧ホースの補強構造を示す一部切欠した正面図である。
【図３】従来の高圧ホースの補強構造を示す一部切欠した正面図である。
【図４】従来の鋼線編組補強層を備えた高圧ホースの一部切欠した正面図である。
【図５】従来の鋼線編組補強層と糸編組補強層とを備えた高圧ホースの一部切欠した正面図である。
【図６】従来の金具を装着した高圧ゴムホースの一部拡大正面図である。
【図７】引張り荷重負担層の巻付け角度を、内圧力負担層の巻付け角度より小さく設定した場合の模式図である。
【符号の説明】
１ 高圧ゴムホース
２ 内面ゴム層
３ センター布
４ 外面ゴム層
５ 層間ゴム層
７ａ，７ｂ，７ｃ，７ｄ，７ｅ，７ｆ 鋼線スパイラル補強層
８ａ，８ｂ，８ｃ，８ｄ 鋼線スパイラル補強層
９ 鋼線編組層
１０ａ，１０ｂ，１０ｃ 鋼線編組層
１１ａ，１１ｂ 鋼線編組層
１１ｃ 糸編組層
１２ａ，１２ｂ，１２ｃ，１２ｄ 鋼線スパイラル補強層
１３ａ，１３ｂ 鋼線スパイラル補強層
α_a 〜α_d 鋼線巻付け角度
２０ 金具 ２０ａ 金具端末部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-pressure rubber hose for construction / civil engineering machinery that is used by connecting several assembly hoses with metal fittings attached to both ends of a rubber hose having a single length of 20 m or 40 m and winding them around a reel. The present invention relates to a high-pressure rubber hose for construction / civil engineering machines used in civil engineering machines that require bending, tension and bending deformation.
[0002]
[Prior art]
As shown in FIG. 6, a low-elongation high-pressure rubber hose that has been subjected to internal pressure, tensile load, and bending, which are conventionally used in construction machines, civil engineering machines, etc., and that is repeatedly wound and unwound as shown in FIG. Several high pressure rubber hoses 1 are assembled and used by connecting several assembly hoses with metal fittings 20 at both ends. For example, as shown in FIG. 2 to FIG. Things have been proposed.
[0003]
For example, in the case of a general-purpose high-pressure rubber hose 1 as shown in FIG. 2, an internal pressure bearing layer is interposed between the inner rubber layer 2, the center cloth 3 and the outer rubber layer 4 with an interlayer rubber layer 5 interposed therebetween. The steel wire spiral reinforcement layers 7a, 7b, 7c, 7d, 7e, and 7f are arranged, and the steel wire winding angles α _{a to} α _f of the steel wire spiral reinforcement layers 7a to 7f are α _a < α _b <α _c <α _d <α _e <α _f .
[0004]
As another conventional example, as shown in FIG. 3, an interlayer rubber layer 5 is interposed between the inner rubber layer 2, the center cloth 3 and the outer rubber layer 4 to form an internal pressure bearing layer 4. The steel wire spiral reinforcing layers 8a, 8b, 8c, 8d and the one steel wire braided layer 9 serving as a tensile load bearing layer are disposed, and the steel wire spiral reinforcing layers 8a, 8b, 8c, The steel wire winding angles α _{a to} α _d of 8d are configured to satisfy α _a <α _b <α _c <α _d .
[0005]
Furthermore, in the conventional example shown in FIG. 4, between the inner rubber layer 2 and the outer rubber layer 4, two steel wire braiding layers 10a and 10b serving as internal pressure bearing layers and one layer serving as a tensile load bearing layer are provided. The steel wire braided layer 10c is disposed, and the conventional example shown in FIG. 5 is a two-layer steel wire braid serving as an internal pressure bearing layer between the inner rubber layer 2 and the outer rubber layer 4. The layers 11a and 11b and one yarn braided layer 11c serving as a tensile load bearing layer are provided.
[0006]
[Problems to be solved by the invention]
However, in the case of the general-purpose high-pressure rubber hose 1 as shown in FIG. 2, since it is composed only of the internal pressure bearing layer, when a tensile load acts on the hose, the hose stretches very much and the hose body There is a problem that the inner diameter of the tube becomes thinner and the original state cannot be restored even if the load is removed later.
[0007]
In the case of the high-pressure rubber hose shown in FIG. 3, a steel wire braided layer 9 serving as a tensile load bearing layer is disposed in the outermost layer, and the steel wire diameter of the steel wire braided layer 9 is determined in the processing of the hose. Since there is a restriction of a diameter of 0.4 mm or less, there is a problem that the tensile strength is insufficient, and the steel wire braided layer 9 is damaged at the metal terminal 20a of the metal 20 as shown in FIG.
[0008]
Furthermore, in the case of a high-pressure rubber hose comprising two steel wire braided layers 10a and 10b serving as internal pressure bearing layers and one steel wire braided layer 10c serving as tensile load bearing layers shown in FIG. There is a problem that buckling is likely to occur.
[0009]
Further, in the case of a high-pressure rubber hose comprising two steel wire braid layers 11a and 11b serving as an internal pressure bearing layer and one yarn braiding layer 11c serving as a tensile load bearing layer shown in FIG. There is a problem that the elongation with respect to the load is large due to insufficient tensile strength, and the original state cannot be restored even if the load is removed.
[0010]
As described above, all of the conventional high-pressure hoses have various problems.
[0011]
An object of the present invention is to provide a high-pressure rubber hose for a construction / civil engineering machine that can withstand high pressure, has high tensile resistance, and can effectively prevent breakage at a metal terminal portion, and is rich in flexibility.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a plurality of steel wire spiral reinforcing layers (12a) between an inner rubber layer (2) and an outer rubber layer (4) through interlayer rubber layers (5a) and (5b). , 12b, 12c, 12d, 13a, 13b), and a high-pressure rubber hose (1a) constructed by interposing the inner rubber layers of the steel wire spiral reinforcing layers 12a, 12b, 12c, 12d, 13a, 13b) (2) Two or more layers on the side are composed of steel wire spiral reinforcement layers (12a, 12b, 12c, 12d) that serve as internal pressure bearing layers of even layers, and at least two or more layers on the outer circumference are tensile loads of even layers It is composed of a steel wire spiral reinforcing layer (13a, 13b) serving as a bearing layer, and the winding angle (αf) of the tensile load bearing layer is smaller than the winding angle (αa) of the inner pressure bearing layer (αa> αf) is set, and the steel wire winding angles (α _{a to} α _d ) of the steel wire spiral reinforcing layers (12a, 12b, 12c, 12d) are sequentially increased from the inner pressure bearing layer toward the tensile load bearing layer. Become( α _a <α _b <α _c <α _d ), and the winding angle (αf) of the tensile load bearing layer is 49.7 ° to smaller than the minimum winding angle (αa) of the inner pressure bearing layer. The gist is that the angle is set to 51.4 ° .
Here, the steel wire density of the tensile load bearing layer is set to 70% to 90%, and the thickness of the interlayer rubber layer (5b) on the tensile load bearing layer side is set to the interlayer rubber layer on the inner pressure bearing layer side ( It is set larger than the thickness of 5a). Moreover, it is also possible to use the steel wire whose diameter of the steel wire of the said tensile load bearing layer is thicker than 0.4 mm.
[0013]
Since the present invention is configured as described above, and the internal pressure bearing layer is configured by a steel wire spiral, it can withstand high pressure, and the tensile load bearing layer is configured by a steel wire spiral. The wire diameter is not particularly restricted, and a steel wire thicker than 0.4 mm can be used, and the tensile strength is increased, so that breakage at the metal terminal portion can be effectively prevented. Furthermore, since the steel wire density of the tensile load bearing layer is set to 70 to 90%, it is flexible and can be easily wound on a reel.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
Note that the same components as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.
[0015]
Figure 1 shows a front view with cutaway portions are shown the reinforcing structure of the reel-wound pressure rubber hoses for construction and civil engineering machinery embodying the present invention, the high pressure hose 1a is inner rubber layer 2, a center fabric 3 and the outer surface Interlayer rubber layers 5a and 5b are interposed between the rubber layer 4 and four steel wire spiral reinforcing layers 12a, 12b, 12c, and 12d that serve as internal pressure bearing layers, and 2 that serve as tensile load bearing layers. The steel wire spiral reinforcing layers 13a and 13b are arranged, and the internal pressure bearing layer and the tensile load bearing layer are set to an even number layer of two or more layers for balance.
[0016]
The steel wire wrapping angles αa to αd of the four steel wire spiral reinforcing layers 12a, 12b, 12c and 12d serving as the internal pressure bearing layer are the same as those of the conventional general-purpose hose, 52.2 ° to 55 . The steel wire wrapping angles αe and αf of the two steel wire spiral reinforcing layers 13a and 13b, which are set to 2 ° and serve as the tensile load bearing layer, are set to 49.7 ° to 51.4 ° , The winding angle of the load bearing layer is set to be smaller than the minimum winding angle of the internal pressure bearing layer.
[0017]
That is, when a general high pressure hose is subjected to a tensile load from one end of the hose, the winding angle of the hose reinforcing layer changes, and as a result, the hose extends. At that time, the larger the winding angle, the easier it is to change, and the smaller the winding angle, the more difficult it is to change. In other words, when a tensile load is applied, those with a small winding angle are likely to receive a tensile load, and those with a large winding angle are likely to change (easily stretch). It becomes difficult to receive the load.
[0018]
Thus, the winding angle of the pulling tension load bearing layer as described above, unless you have less than the winding angle of the inner pressure burden layer must be received by the inner pressure load layer tensile weighted inner pressure load In order to prevent the layer from damaging due to a load obtained by applying a tensile load to the internal pressure of the hose, in order to prevent this, the winding angle arrangement as described above is adopted. This is schematically shown in FIG.
[0019]
In other words, the steel wire (A) α: winding angle Small (pull tension load-bearing layer),
Steel wire (B) β: Large winding angle (internal pressure bearing layer),
Assuming that each layer can be moved freely, (A) and (B) move to (A ′) and (B ′), respectively, by pulling the hose.
At that time, the relationship between the amount of elongation of the hose KA and KB is KA <KB.
Since the actual elongation of the hose is the same for the two layers, the tensile load is not applied to the layer (B).
[0020]
For the reasons described above, it is desirable to set the winding angle from the internal pressure bearing layer to the tensile load bearing layer such that α _e ≦ α _f <α _a <α _b <α _c <α _d .
[0021]
Next, the steel wire density of the tensile load bearing layer (steel wire spiral reinforcing layers 13a and 13b) is generally set to exceed 90% and 95% or less in the conventional high-pressure hose. The high-pressure hose 1a in the embodiment is set to 70% to 90%.
[0022]
That is, if the steel wire density is set to 70% or less, the steel wire is likely to be cut when the hose cap is attached. If the steel wire density is 90% or more, the bending force becomes large and the wire is wound around the reel. This is because it becomes difficult to use and will hinder use.
[0023]
Further, the thickness of the interlayer rubber layer 5b on the side of the tensile load bearing layer (steel wire spiral reinforcing layers 13a, 13b) is set to the interlayer rubber on the inner pressure bearing layer (steel wire spiral reinforcing layers 12a, 12b, 12c, 12d) side. It is set larger than the thickness of the layer 5a.
[0024]
That is, the high-pressure rubber hose 1a according to the embodiment of the present invention is required to be flexible for reel winding. In order to improve the flexibility, the thickness of the interlayer rubber may be increased. However, on the other hand, the outer diameter of the hose is increased, the pressure resistance is lowered, and the mass is increased.
[0025]
Therefore, in the case of the high-pressure hose 1a in this embodiment, the thickness of the interlayer rubber layer 5a on the inner pressure bearing layer side is the same as the thickness (0.2 mm) of the interlayer rubber layer of the conventional general-purpose hose. By making the thickness of the interlayer rubber layer 5b on the load bearing layer side thicker than the inner pressure bearing layer side (for example, about 0.6 mm), the hose can be easily bent.
[0026]
Further, in the case of a conventional steel wire braided reinforcing layer, there is a restriction that the steel wire diameter is 0.4 mm or less in terms of braiding, but in the embodiment of the present invention, the steel wire spiral reinforcing layer is configured. Therefore, there is no restriction in processing, and therefore, a steel wire having a diameter larger than 0.4 mm can be used for the steel wire of the tensile load bearing layer. Thereby, a tensile strength becomes large and it can prevent the failure | damage in a metal fitting terminal part.
[0027]
Next, Table 1 and Table 2 below show the experimental results of the reel-wound high-pressure hose of the present invention.
[0028]
The specifications of the high-pressure hose used in this experiment are: inner diameter: 50.8 mm, outer diameter: 75 mm, wire diameter of steel wire: 0.8 mm, interlayer rubber (inner pressure bearing layer: 0.2 mm, tensile load bearing layer: 0.6 mm ). W / S represents steel wire (wire) / spiral.
[0029]
Table 1 below shows the case where the winding angle of the internal pressure bearing layer and the winding angle of the tensile load bearing layer of the reel-wound high-pressure hose are variously set. Examples 1 and 2 of the present invention and Comparative Example 1 , 2, 3 and Conventional Examples 1 and 2 are compared with respect to breaking pressure, tensile breaking force, hose elongation, and bending force.
[0030]
[Table 1]

[0031]
In Table 1 above, the bending force is in the order of Comparative Example 1> Comparative Example 3> Example 1> Example 2> Comparative Example 2 depending on the winding angle of the tensile load bearing layer. .
[0032]
In addition, the bending force of Conventional Example 2 (general purpose hose) is larger than that of Example 1, Example 2 and Comparative Example 2 of the interlayer rubber between 4 W / S and 5 W / S, 5 W / S and 6 W / S. This is because the thickness is thinner than that of Example 1, Example 2, and Comparative Example 2. That is, the thickness of the interlayer rubber in Conventional Example 2 is 0.2 mm, and the other hoses are 0.6 mm.
[0033]
Table 2 below shows an experimental example in which the winding angle of the inner pressure bearing layer and the winding angle of the tensile load bearing layer of the reel-wound high-pressure hose are set constant and the thickness of the interlayer rubber is changed. ing.
[0034]
[Table 2]

[0035]
In Table 2, in Comparative Example 2, the bending force is smaller than in Examples 1 and 2 because the thickness of the interlayer rubber of the tensile load bearing layer is large.
[0036]
【The invention's effect】
As described above, in the present invention, a plurality of steel wire spiral reinforcing layers (12a, 12b) are interposed between the inner rubber layer (2) and the outer rubber layer (4) via the interlayer rubber layers (5a), (5b). , 12c, 12d, 13a, 13b) is a high-pressure rubber hose (1a) constructed by interposing the inner rubber layer (12a, 12b, 12c, 12d, 13a, 13b) of the inner surface rubber layer (12a, 12b, 12c, 12d, 13a, 13b) 2) The two or more layers on the side are composed of steel wire spiral reinforcing layers (12a, 12b, 12c, 12d) that serve as internal pressure bearing layers of even layers, and at least two or more layers on the outer periphery of the layers are the tensile load loads of even layers. Steel wire spiral reinforcement layers (13a, 13b), and the winding angle (αf) of the tensile load bearing layer is smaller than the winding angle (αa) of the inner pressure bearing layer (αa> αf ) Set the steel wire spiral reinforcement layers (12a, 12b, 12c, 12d) and gradually increase the winding angle (α _{a to} α _d ) of the steel wire from the internal pressure bearing layer toward the tensile load bearing layer. (Α _a <α _b <α _c <α _d ), and the winding angle (αf) of the tensile load bearing layer is 49.7 ° to 51.4 ° smaller than the minimum winding angle (αa) of the inner pressure bearing layer. Having set, making it possible to withstand high pressure, can be effectively prevented from being damaged in the scratch tension force is large fitting terminal portion, there is an effect that it is possible to a high pressure rubber hose highly flexible.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing a reinforcing structure of a reel wound high pressure hose embodying the present invention.
FIG. 2 is a partially cutaway front view showing a reinforcing structure of a conventional general-purpose high-pressure hose.
FIG. 3 is a partially cutaway front view showing a reinforcing structure of a conventional high pressure hose.
FIG. 4 is a partially cutaway front view of a high pressure hose provided with a conventional steel wire braided reinforcing layer.
FIG. 5 is a partially cutaway front view of a high pressure hose provided with a conventional steel wire braid reinforcement layer and a yarn braid reinforcement layer.
FIG. 6 is a partially enlarged front view of a high-pressure rubber hose fitted with a conventional metal fitting.
FIG. 7 is a schematic view when the winding angle of the tensile load bearing layer is set smaller than the winding angle of the internal pressure bearing layer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High pressure rubber hose 2 Inner rubber layer 3 Center cloth 4 Outer rubber layer 5 Interlayer rubber layer 7a, 7b, 7c, 7d, 7e, 7f Steel wire spiral reinforcement layer 8a, 8b, 8c, 8d Steel wire spiral reinforcement layer 9 Steel wire braiding layers 10a, 10b, 10c steel braid layer 11a, 11b steel braid layer 11c yarn braided layers 12a, 12b, 12c, 12d steel wire spiral reinforcement layer 13a, 13b steel wire spiral reinforcement layer alpha _a to? _d steel wire wound Angle 20 bracket 20a bracket end

Claims (4)

A plurality of steel wire spiral reinforcement layers (12a, 12b, 12c, 12d, 13a, 13b) are provided between the inner rubber layer (2) and the outer rubber layer (4) via interlayer rubber layers (5a), (5b). ) And a high pressure rubber hose (1a) comprising two or more layers on the inner rubber layer (2) side of the steel wire spiral reinforcing layer (12a, 12b, 12c, 12d, 13a, 13b). The steel wire spiral reinforcement layer (12a, 12b, 12c, 12d), which is an even-layer inner pressure bearing layer, and at least two of the outer circumferences are even-layer tensile load bearing layers (13a, 13b), the winding angle (αf) of the tensile load bearing layer is set smaller than the winding angle (αa) of the inner pressure bearing layer (αa> αf), and the steel wire spiral Each steel wire winding angle (α _{a to} α _d ) of the reinforcing layer (12a, 12b, 12c, 12d) is gradually increased from the internal pressure bearing layer to the tensile load bearing layer (α _a <α _b <α _c <α _d ) A construction / civil engineering machine characterized in that the winding angle (αf) of the tensile load bearing layer is set to 49.7 ° to 51.4 °, which is smaller than the minimum winding angle (αa) of the internal pressure bearing layer. High pressure rubber hose. The high-pressure rubber hose for construction and civil engineering machines according to claim 1 , wherein a steel wire density of the tensile load bearing layer is set to 70% to 90% . The construction / civil engineering machine according to claim 1 or 2, wherein a thickness of the interlayer rubber layer (5b) on the tensile load bearing layer side is set larger than a thickness of the interlayer rubber layer (5a) on the inner pressure bearing layer side. High pressure rubber hose. The high-pressure rubber hose for construction / civil engineering machines according to claim 1, 2 or 3, wherein the steel wire of the tensile load bearing layer has a wire diameter thicker than 0.4 mm.

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