JPH1158544A - Manufacture of tapered rubber hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a tapered rubber hose capable of dealing with the case of large L/D without necessity of executing a complicated previous step and further commercializing it, an apparatus copable of being favorably adapted to the method, and the hose obtained by the method. SOLUTION: In the method for manufacturing a tapered rubber hose for forming a reinforcing fiber layer 3 by spirally winding a plurality of fibers 1 in an aligned state on a tapered surface 2 to be reinforced, in the case of forming the layer 3 by winding the fibers 1 on the surface 2 while feeding the fibers 1 in the aligned state from a fiber feeding roller 4 on which the plurality of fiber 1 are wound, a log wound on a small diameter side of the surface 2 of a plurality of intermediate fibers 1a existing between the surface 2 and the roller 4 and a length of the fiber 1a are relatively gradually lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a tapered rubber hose for forming a reinforcing fiber layer by spirally winding a plurality of fibers side by side on a tapered surface to be reinforced, and a method of manufacturing the same. And a tapered rubber hose obtainable by the method.

[0002]

2. Description of the Related Art Conventionally, fiber-reinforced tapered rubber hoses have been used for joints for connecting different diameter pipes. However, in consideration of physical properties of the tapered rubber hose such as flexibility and gross weight, It is desirable that the outer surface and the inner surface have a tapered shape, and the reinforced surface also has a tapered shape. For example, in a concrete pump truck, it is necessary to connect a rubber hose (for example, diameter 5B) for a boom vehicle and a rubber hose (for example, diameter 4B) for placing concrete, but by using the tapered rubber hose as described above, The increased flexibility facilitates the casting operation and reduces the total weight, which is advantageous in terms of cost and production. As a method of fiber reinforcement, it is desirable that the reinforcement angle with respect to the pipe axis be substantially equal to the stationary angle in consideration of expansion and contraction of the rubber hose against internal pressure and the like.

On the other hand, when the surface to be reinforced is a straight tube, such as a straight pipe (straight pipe), a reinforcing fiber layer is formed by spirally winding a plurality of fibers on the surface to be reinforced in a state of being arranged. Is easy and industrially, a method of coating (topping) unvulcanized rubber on a plurality of slender fibers and spirally winding them at a certain angle (for example, static angle) Was taken.

[0004]

However, when a plurality of fibers are spirally wound on a tapered reinforcing surface while being fed in a state where a plurality of fibers are arranged from a fiber feed roller in which a plurality of fibers are wound, the reinforcing surface and Among the plurality of intermediate fibers existing between the fiber feed roller and the fiber feed roller, there is a problem that the fiber gradually loosens toward the smaller diameter side of the surface to be reinforced and cannot be wound on the surface to be reinforced. Was. Assuming that one fiber
In the case where the tape is helically wound a plurality of times on the tapered reinforcing surface one by one, the above-mentioned problem does not occur, but it requires a number of steps and is not an industrially advantageous method.

As a method for solving such a problem, Japanese Patent Application Laid-Open No. Hei 8-159349 discloses a method in which a plurality of slender fibers coated with unvulcanized rubber are formed in a fan shape, and this is formed into a tapered reinforcing surface 2. A method of spirally winding is disclosed.
That is, as shown in FIG. 8, when the tapered surface is spirally cut along the static angle, the tapered surface is developed into a distorted sector shape. However, the reinforcing fiber layer 3 is formed in advance so as to form the sector shape. For example, the reinforcing fiber layer 3 can be formed without loosening simply by winding it on the tapered surface to be reinforced.

However, it is complicated and not easy to form a distorted fan-shaped reinforcing fiber layer. Particularly, when L / D (pipe length / pipe diameter ratio) is large, a corresponding fan-shaped reinforcing fiber layer is required. Is difficult to form. This is because if the L / D is large, the length of the fiber itself becomes long and the fan-shaped distortion amount also increases. Therefore, the above method cannot be said to be an industrially advantageous production method in that the above-described pre-process is required. In addition, even if the distorted fan-shaped reinforcing fiber layer can be wound directly on the surface to be reinforced from a flat state,
Since the reinforcing fiber layer cannot be wound on a roller or the like in advance, it has been difficult to mechanically wind the reinforcing fiber layer while feeding the reinforcing fiber layer from the roller or the like.

Accordingly, an object of the present invention is to provide
A method for manufacturing a tapered rubber hose which does not require complicated pre-processes, can cope with a large L / D, and can be industrialized, and an apparatus suitably used for the manufacturing method.
Another object of the present invention is to provide a tapered rubber hose obtained by the manufacturing method.

[0008]

A feature of the manufacturing method of the present invention for achieving the above object is to form a reinforcing fiber layer by spirally winding a plurality of fibers side by side on a tapered surface to be reinforced. In the method for manufacturing a tapered rubber hose for forming a fiber, a plurality of the fibers are wound from a fiber feed roller wound around the surface to be reinforced while forming the fibers while feeding the fibers in an aligned state to form the reinforcing fiber layer. In doing so, of the plurality of intermediate fibers existing between the reinforced surface and the fiber feed roller, the side wound on the small diameter side of the reinforced surface,
The present invention has a winding step of gradually increasing the length of the intermediate fiber. Here, the tapered reinforcing surface is
The taper angle may be constant or may change, or may be a tapered portion connected to a straight pipe.

As a method for gradually increasing the length of the intermediate fiber, various methods can be applied as described later. However, a feed guide portion for guiding the feed of each fiber of the intermediate fiber is provided. Performing the winding step while controlling the feed guide portion such that the intermediate fiber is relatively longer gradually toward the side that guides the fiber wound on the small diameter side of the reinforced surface, which will be described later. It is more preferable than the effect.

[0010] Each of the plurality of fibers may be independent, or may be connected in the form of a weft with weft fibers. It is covered with vulcanized rubber and made into a strip shape,
It is more preferable than the operation and effect described below.

On the other hand, the characteristic structure of the apparatus of the present invention for suitably carrying out the above-mentioned manufacturing method includes a fiber feeding means for feeding a plurality of fibers, and a winding method for winding the fibers in a state of being arranged on a reinforced surface of a rubber hose. A reinforcing fiber layer forming apparatus for a rubber hose, comprising: a guide for guiding the feeding of each fiber to an intermediate fiber existing between the reinforcing surface formed in a tapered shape and the fiber feeding means. In addition to providing a roller, a drive mechanism that inclines the guide roller so that the intermediate fiber becomes relatively longer gradually toward the side that guides the fiber wound on the small diameter side of the surface to be reinforced. .

On the other hand, the characteristic structure of the tapered rubber hose of the present invention which can be obtained by the above-mentioned manufacturing method is that in a tapered rubber hose having a reinforcing fiber layer helically reinforced with a plurality of fibers, The point is that the fiber spacing of the fibers is substantially constant in all the portions.

The above configuration does not limit the reinforcing angle with respect to the pipe axis, and any reinforcing angle can be adopted. However, at least one of the plurality of fibers has a reinforcing angle with respect to the pipe axis. While being substantially equal to the static angle, while being spirally wound on the surface to be reinforced, the other fibers are spirally wound with a substantially constant fiber spacing between the spirally wound fibers. Is more preferable than the function and effect described below.

According to the manufacturing method of the present invention, among the plurality of intermediate fibers existing between the reinforced surface and the fiber feed roller, the intermediate fibers are wound on the small diameter side of the reinforced surface. Since the winding process of gradually increasing the length of the intermediate fiber toward the side is performed, the fiber can be spirally wound with an appropriate tension on the tapered reinforcing surface without loosening. At this time, since the winding direction is not particularly limited, the fiber can be reinforced while keeping the reinforcing angle with respect to the pipe axis to a certain degree. When the material wound on the surface to be reinforced is unfolded into a flat surface, it becomes a distorted fan shape. However, since it is not necessary to arrange fibers in such a complicated shape in advance, regardless of the L / D, as described above. Can be rolled up. Further, even if the taper angle changes, it can be coped with by adjusting the length of the intermediate fiber. For example, a reinforcing fiber layer can be formed continuously even on a continuous body of a straight pipe and a tapered pipe. As a result, there is no need to perform complicated pre-processes, and L / D
And a method for manufacturing a tapered rubber hose that can be industrialized.

[0015] A feed guide portion for guiding the feed of each fiber of the intermediate fibers is provided, and the intermediate fibers become relatively longer as the fibers are wound on the small diameter side of the surface to be reinforced. When performing the winding step while controlling the feed guide portion as described above, with the relative position between the axis of the fiber feed roller and the axis of the reinforced surface fixed,
The above-described winding can be performed by controlling only the guide portion. Moreover, by increasing the number of guide portions, the amount of change in the relative length of the intermediate fiber can be increased.

In the case where the plurality of fibers are strip-shaped by coating unvulcanized rubber in a state where each of the fibers is arranged side by side, while maintaining the arrangement of the rubber-coated (topping) fibers, The same winding as described above can be performed while causing shear deformation of the vulcanized rubber. Further, it is easy to adjust the shape by cutting the strip-shaped object. For example, by cutting the strip into a tapered shape, the reinforcing angle with respect to the pipe axis can be maintained to some extent uniform.

On the other hand, according to the apparatus of the present invention, a guide roller for guiding the feeding of each fiber is provided for the intermediate fiber existing between the tapered reinforcing surface and the fiber feeding means. Since a drive mechanism for inclining the guide roller is provided such that the intermediate fiber becomes relatively longer as the fiber is wound on the smaller diameter side of the surface to be reinforced, the fiber feeding means is provided. In a state where the relative position of the axis of the surface to be reinforced and the axis of the reinforced surface is fixed, simply inclining the guide roller, with respect to the tapered reinforcing surface,
The fiber can be wound up with an appropriate tension without loosening, and the reinforcing fiber layer can be formed while maintaining the reinforcing angle with respect to the pipe axis to some extent. Further, with a simple device configuration, a reinforcing fiber layer can be suitably formed on a tapered reinforcing surface. As a result, it was possible to provide an apparatus capable of suitably implementing a method of manufacturing a tapered rubber hose which does not require complicated pre-processes, can cope with a large L / D, and can be industrialized.

On the other hand, according to the tapered rubber hose of the present invention, the fiber spacing of the fibers is substantially constant in all parts of the reinforcing fiber layer, so that the reinforcing effect per unit area is substantially constant, and particularly, the internal pressure. A uniform reinforcing effect can be obtained.

At least one of the plurality of fibers is spirally wound around the surface to be reinforced while making the reinforcing angle with respect to the tube axis substantially equal to the static angle, and the spiral shape When the other fibers are spirally wound with the fiber spacing being substantially constant between the fibers wound in, the reinforcing angle of the fibers is substantially equal to the static angle,
Since the reinforcing fiber layer is reinforced with an angle substantially equal to the stationary angle existing therebetween, partial expansion and contraction of the tapered tube due to internal pressure or the like can be significantly reduced at most of the reinforcing fiber layer.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

[Manufacturing Method] Referring to FIG. 1 which is an explanatory view of the operation, the manufacturing method of the present invention is to spirally wind a tapered reinforcing surface 2 in a state where a plurality of fibers 1 are arranged. A method for manufacturing a tapered rubber hose for forming a reinforcing fiber layer 3 by winding a plurality of fibers 1 from a fiber feed roller 4 while arranging the fibers 1 side by side while winding the fibers 1 side by side. When forming the reinforcing fiber layer 3, of the plurality of intermediate fibers 1 a existing between the surface 2 to be reinforced and the fiber feed roller 4, the smaller diameter side (D2 side) of the surface 2 to be reinforced.
And the length L2 of the intermediate fiber 1a is gradually increased as the side is wound.
FIG. 1 shows a method of inclining the fiber feed roller 4 in the direction of arrow A, which is the easiest method to understand, as a method of gradually increasing the length of the intermediate fiber 1a toward the smaller diameter side. A plurality of fibers 1 wound around a fiber feed roller 4 in a state of being arranged in the same width are schematically illustrated. In synchronization with the winding, the small-diameter side (D
2).

First, loosening of the intermediate fiber 1a on the small diameter side will be described with reference to FIGS. Assuming that the reinforcing angle of the surface 2 to be reinforced with respect to the pipe axis is α at the beginning of the winding, the outer peripheral length L3 of the large diameter portion (D1 portion) of the surface 2 to be reinforced is L3 = D1 × π. When winding a plurality of fibers 1 with a width so as to cover the circumference, the width W1 of the arranged fibers 1 is W1 = L3 × cosα = D1 × π × cosα. The distance W2 between the fibers at both ends in the axial direction is as follows: W2 = W1 / sinα = D1 × π × cosα / sinα
= D1 × π / tanα.

On the other hand, the taper angle β is β = tan ⁻¹ [(D1−D2) / 2 / L]. W2 is the width when wound on a straight pipe, and the radius reduction ΔR when wound on a tapered pipe is ΔR = W2 / tanβ, and the large diameter side and the small diameter when one round of winding is generated by the reduction ΔR. The difference ΔL in the winding amount on the side is ΔL ≒ ΔR × 2 × π = W2 / tanβ × 2 × π.

For example, when roughly calculated under the following conditions, ΔL
≒ 11.7 mm. α: 54 °, D1: 130m
m, D2: 105 mm, L1: 2000 mm, L
3: 408mm, W1: 240mm, W2: 297m
m, β = 0.36 °, ΔR: 1.87 mm, ΔL: about 1
1.7 mm. That is, when the plurality of fibers 1 are wound side by side on the tapered reinforced surface 2 having the dimensions described above, the loosening of the intermediate fiber 1a on the small diameter side occurs about 12 mm per rotation. become. Accordingly, if the length of the intermediate fiber 1a is gradually increased relatively to the smaller diameter side correspondingly, the loosening is alleviated by that much, and the winding can be performed with an appropriate tension.

Next, a specific embodiment will be described. The fiber feed roller 4 is formed by winding a plurality of fibers 1, and FIG. 1 schematically illustrates a state in which a plurality of fibers 1 are wound around the fiber feed roller 4 in a state of being arranged. Any winding method may be used as long as it can cause a shift between the fibers 1. For example, a plurality of fibers 1
However, there may be mentioned those in which strips are formed by coating unvulcanized rubber in a state where they are arranged, and those in which the arrangement of the fibers 1 is maintained, which is equivalent to weft yarn. In the case of a strip formed by coating the unvulcanized rubber, a shift between the fibers 1 can be caused by the shearing deformation of the unvulcanized rubber.

In FIG. 1, a plurality of fibers 1 are wound side by side with the same width. However, in order that all the fibers 1 have the same reinforcing angle, as the fibers 1 are wound on the smaller diameter side, It is necessary to narrow the interval between the fibers 1. This is because, when wound around the tapered surface 2 to be reinforced at the same reinforcing angle, the spiral pitch becomes smaller as the diameter becomes smaller.
Therefore, instead of arranging and winding a plurality of fibers 1 at the same width, it is preferable to wind the fibers 1 side by side while gradually reducing the interval between the plurality of fibers 1 in accordance with the reduction in pitch, from the viewpoint of making the reinforcing angle uniform. In this case, for example, two types of guide rollers having different guide pitches for holding the respective fibers 1 may be prepared, and a plurality of fibers existing therebetween may be coated with unvulcanized rubber. However, all fibers 1
In comparison between the effect of winding at exactly the same reinforcing angle and the complexity of the above steps, it was determined that it was more advantageous to employ the following method.

That is, FIG. 3 (a) is a plan view reduced in the longitudinal direction, and FIG. 3 (b) is a view of the end face in the longitudinal direction. After the unvulcanized rubber 8 is covered and formed into a strip shape in the arranged state, one of the long sides is formed along the fiber 1b, and the other is cut so as to taper while traversing the fiber 1. . In addition,
Since the fiber reinforcement is usually formed by laminating even-numbered layers (for example, two layers), the fiber is cut at the center so that two layers can be formed as a pair. Reinforcement angle (eg, γ = 90 ° -α) to fit end
And the length of the cut portion is adjusted to be equal to the outer peripheral length L3 of the large diameter portion. Thereby, the reinforcing fiber layer 3 can be formed on the entire surface to be reinforced 2 by one winding, and one of a plurality of fibers is wound at a constant reinforcing angle.
Between the fibers, another fiber (having a substantially equal reinforcing angle) can be wound with the fiber spacing substantially constant. In addition, the strip-like material after such cutting is used as the fiber feed roller 4.
And as a result, the fiber 1 can be sent out as in FIG.

As the material of the fiber 1, any of various fibers used as a reinforcing fiber for a hose, such as a resin and a metal, can be used.
This method is suitable for steel fiber. Because the steel fiber is wound around the fiber feed roller 4 and has a curl, it can be easily wound on the reinforced surface 2. However, in the above-described conventional method, a flat fan-shaped strip is used. This is because the object is wound on the surface to be reinforced, so that it is difficult to wind because the curl is not attached.

The surface 2 to be reinforced is tapered, and a reinforcing fiber layer 3 is formed by spirally winding a plurality of fibers 1 in a state of being arranged. The reinforced surface 2 usually corresponds to the surface of the inner rubber layer formed on the surface of the tapered mandrel, but this is the case where it is formed as an inner reinforcing fiber layer, and the case where it is formed as an outer reinforcing fiber layer. However, the surface 2 to be reinforced corresponds to the surface of the intermediate rubber layer or the like, and is not particularly limited. Further, the surface to be reinforced 2 may be a continuous body of a straight tubular portion and a tapered portion.

In the method shown in FIG. 1, the fiber feed roller 4 is inclined in the direction of arrow A so that the length of the intermediate fiber 1a is gradually increased toward the smaller diameter side.
Since the loosening of a occurs by ΔL for each rotation, θ = tan ⁻¹ (ΔL / W1) in accordance with the following formula, and incline in the direction of arrow A at an angle corresponding to θ for each rotation. It will be good. However, since the direction of the axis of the fiber feed roller 4 and the arrangement direction (fiber feed direction) of the intermediate fibers 1a gradually becomes smaller than 90 °, the above-described effect of the inclination becomes smaller accordingly. There is a need. This phenomenon becomes more conspicuous as the taper angle β is larger and the pipe size (tube diameter, pipe length) is larger. Therefore, the smaller the ΔL, the more suitable the method of FIG. 1 can be used. On the other hand, in the method of FIG. 1, the width of the intermediate fiber 1a perpendicular to the fiber feeding direction decreases as the inclination in the direction of the arrow A decreases. From this point, the smaller the ΔL is, the more the method of FIG. It turns out to be advantageous.

As a method for relatively gradually increasing the length of the intermediate fiber 1a toward the smaller diameter side, for example, a method shown in FIG. 4 can be mentioned. This is because the feed guide portions 5a and 5b that guide the feed of each fiber of the intermediate fiber 1a are provided, and the intermediate fiber 1a is relatively moved toward the side where the fiber 1 wound on the small diameter side of the reinforced surface 2 is guided. The winding process is performed while controlling the feed guide portions 5a and 5b so as to gradually increase the length. Specifically, the feed guide portions 5a, 5b
Are constituted by drive guide rollers or the like which can be inclinedly driven, and fixed guide rollers 6 are disposed on both sides thereof, so that the feed guide portion 5a is gradually inclined in the A1 direction and the feed guide portion 5b is gradually inclinedly driven in the A2 direction. I just need. In FIG.
Although it is provided in one place, since the amount by which the length of the intermediate fiber 1a can be adjusted is larger than that in one place, it is preferable to provide a plurality of places because it is easy to cope with a case where ΔL is large. The mechanism for tilt drive will be described later in the description of the apparatus.

In the above method, the method of gradually increasing the length of the intermediate fiber 1a toward the smaller diameter side in accordance with ΔL calculated in advance has been described, but the tension (looseness) of the fiber 1a on the smaller diameter side is reduced. Upon detection, control may be performed to incline the guide roller or the like so as not to cause loosening, or a mechanism that changes the angle of inclination of the guide roller or the like according to the tension may be employed. Also, instead of configuring the feed guide unit as an integrated guide roller, the portion that guides the feed of each fiber can be independently position-controlled,
It is also possible to appropriately cope with a more complicated tapered surface 2 to be reinforced (such as a surface whose taper angle changes). In this case, it is more realistic to adopt a mechanism in which the arrangement of each guide portion changes according to the tension, rather than performing calculation and control in advance.

The manufacturing method after the formation of the reinforcing fiber layer 3 as described above is not particularly different from the case of the conventional rubber hose, and any known manufacturing method can be adopted for that part. As each member, any known members can be used. That is, for example, a tapered coil is extrapolated to the surface of the reinforcing fiber layer, an unvulcanized intermediate rubber layer is formed therebetween, and an outer fiber reinforcing layer made of plain weave, etc. is wound, and the unvulcanized An outer rubber layer and the like are formed, and finally a vulcanization operation is performed.

[Regarding the Apparatus of the Present Invention] The apparatus for forming a reinforcing fiber layer of the present invention can be suitably used in the above-mentioned production method, and is specifically configured as follows. That is,
The reinforcing fiber layer forming apparatus of the present invention comprises a fiber feeding means for feeding a plurality of fibers, and a winding means for winding the fibers on a reinforced surface of a rubber hose in a state where the fibers are arranged, as a basic structure, As such a basic structure, the same structure as that of a conventional apparatus for forming a reinforcing fiber layer on a straight pipe is employed. Since the conventional apparatus is described in detail in Japanese Patent Publication No. 47-17475, the outline of the basic structure will be described in this specification.

The fiber feeding means for feeding a plurality of fibers 1 includes the fiber feeding roller 4 as described above, a supporting mechanism for supporting the shaft portion, a mechanism for adjusting the torque applied to the shaft portion, and the like. And a mechanism in which tension is adjusted by a brake mechanism of a guide roller instead of torque adjustment, a mechanism having a mechanism for winding a liner simultaneously with fiber feeding, and a mechanism having a fiber feeding guide plate. Further, as a winding means for winding the fibers 1 on the reinforced surface 2 of the rubber hose in a state where the fibers 1 are arranged, a mandrel for forming the tapered reinforced surface 2 as described above, or a mandrel for supporting the same, and winding the same. A mechanism configured by a rotation and movement mechanism for performing rotation and movement for picking up is exemplified. At that time, the rotation and the movement are performed in synchronization with each other. However, as in the device described in Japanese Patent Publication No. 47-17475, the movement is performed by a fiber feeding means, and a mechanism for transmitting the power of the rotation and the movement is provided. , The rotation and the movement may be synchronized.

A roller having a plurality of ring-shaped grooves is provided as a guide roller for guiding the feeding of each fiber to the intermediate fiber 1a existing between the reinforcing surface 2 formed in a tapered shape and the fiber feeding means. Further, a roller having a shape in which the fiber is unlikely to be displaced in the roller direction due to the inclination of the guide roller, such as a roller for preventing a strip from sliding, is preferable. Reinforced surface 2
As the drive mechanism 7 for inclining the guide roller 5 so that the intermediate fiber 1a becomes relatively longer as the fiber 1 is wound on the smaller diameter side, a screw pair as shown in FIG. The driving mechanism used is exemplified.

In the apparatus shown in FIG. 5, one end of the rubber roller 5c is used as a swing shaft, and is supported swingably by a bearing 7a.
The other end is connected to a female thread part 7d via a telescopic part 7b and a swing connection part 7c. A screw shaft 7e (male screw) is screwed to the female screw portion 7d, and the screw shaft 7e is rotatable by an electric motor 7f. The drive mechanism 7 controls the amount of rotation of the electric motor 7f to adjust the inclination angle of the rubber roller 5c.

As another driving mechanism 7, both ends of the guide roller 5 are rotatably supported by both ends of a U-shaped member or a U-shaped member, and are rotated so as to have a rotationally symmetric axis of the U-shaped member or the like. The drive shaft may be connected, and the guide roller may be inclined by its rotation. In addition, various methods can be adopted.

[Hose of the Present Invention] The hose of the present invention is, as shown in FIGS. 6 and 7, a tapered rubber hose having a reinforcing fiber layer 3 helically reinforced with a plurality of fibers 1. Thus, the fiber spacing of the fibers 1 is substantially constant in all portions of the reinforcing fiber layer 3. That is, in the manufacturing method of the present invention, in the tapered rubber hose manufactured using the strip-shaped material as shown in FIG. 3, at least one of the plurality of fibers 1 (fiber 1b in FIG. 7) is a tube. While maintaining the reinforcing angle with respect to the axis constant, the other fibers 1 are spirally wound on the surface 2 to be reinforced, and the fibers 1 are wound between the spirally wound fibers 1 with a substantially constant fiber spacing. It is spirally wound. At this time, as shown in FIG. 7 which is an enlarged view of the main part, the side where the fiber 1 of the tapered strip is cut is in contact with the side where the fiber 1 is not cut. As the fiber 1 approaches the side where the fiber 1 is cut from 1b, the reinforcing angle is slightly shifted. It is preferable that the reinforcing angle is set substantially equal to the stationary angle because the expansion and contraction of the hose due to internal pressure or the like is reduced. Although the static angle of the straight pipe is 54 ° 44 ′, the angle of the tapered pipe is almost the same as that of the straight pipe unless the taper angle is large.

In the embodiment shown in FIGS. 6 and 7, two layers of the reinforcing fiber layer 3 are provided on the surface of the inner rubber layer 11 so that the fibers cross each other, and the coil 12 is provided on the surface thereof, and the intermediate layer is provided therebetween. A rubber layer 15 is provided. Further, an outer reinforcing fiber layer 13 is provided on the surface thereof, and an outer rubber layer 14 is provided on the surface thereof. The following are examples of specific materials and the like, but are not limited thereto.

Inner rubber layer 11: Natural rubber, JIS A hardness 60 °, 5t Reinforcement fiber layer 3: Steel cord, angle 54 ° 44 ', strength 800kgf / cm1t × 2 layers Coil 12: SW-B hard steel wire, φ = 4mm, pitch 2
5 mm intermediate rubber layer 15: natural rubber, JIS A hardness 60 °, 4
t Outer reinforcing fiber layer 13: plain nylon weave, 0.5t Outer rubber layer 14: natural rubber, JIS A hardness 60 °, 3
t

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the operation of a method for manufacturing a tapered rubber hose.

FIG. 2 is a diagram illustrating the operation of a method for manufacturing a tapered rubber hose.

FIG. 3 is a diagram showing a method of cutting a strip-shaped object.

FIG. 4 is a diagram illustrating the operation of a manufacturing method according to another embodiment.

FIG. 5 is a diagram showing a main part of the apparatus of the present invention.

FIG. 6 is a sectional view showing an example of a tapered rubber hose.

FIG. 7 is an enlarged view of a main part of a tapered rubber hose.

FIG. 8 is a development view of a conventional reinforcing fiber layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fiber 1a Intermediate fiber 2 Reinforced surface 3 Reinforcement fiber layer 4 Fiber feed roller 5 Feed guide part 7 Drive mechanism

Claims (6)

[Claims] 1. A method of manufacturing a tapered rubber hose for forming a reinforcing fiber layer by spirally winding a plurality of fibers side by side on a tapered surface to be reinforced, wherein the plurality of fibers are wound. While feeding the fibers in a state where they are arranged from a given fiber feed roller, when winding up on the surface to be reinforced to form the reinforcing fiber layer, there is between the surface to be reinforced and the fiber feed roller. A method of manufacturing a tapered rubber hose, comprising a winding step of relatively gradually increasing the length of the intermediate fiber as it is wound to the smaller diameter side of the surface to be reinforced among the plurality of intermediate fibers. 2. A feed guide portion for guiding the feed of each fiber of the intermediate fiber is provided, and the intermediate fiber is relatively gradually gradually guided toward a fiber wound on the small diameter side of the surface to be reinforced. The method for manufacturing a tapered rubber hose according to claim 1, wherein the winding step is performed while controlling the feed guide portion so as to be longer. 3. The method for producing a tapered rubber hose according to claim 1, wherein the plurality of fibers are formed in a strip shape by coating an unvulcanized rubber in a state where the fibers are arranged side by side. 4. A reinforcing fiber layer forming device for a rubber hose, comprising: a fiber feeding means for feeding a plurality of fibers; and a winding means for winding the fibers in a state of being arranged on a surface to be reinforced of a rubber hose. A guide roller for guiding the feeding of each fiber is provided for the intermediate fiber existing between the reinforced surface and the fiber feeding means formed in a shape, and the intermediate fiber is wound on the small diameter side of the reinforced surface. A reinforcing fiber layer forming apparatus provided with a drive mechanism for inclining the guide roller so that the intermediate fiber becomes relatively longer as the fiber is guided. 5. A tapered rubber hose comprising a reinforcing fiber layer helically reinforced by a plurality of fibers, wherein the fiber spacing of the fibers is substantially constant in all portions of the reinforcing fiber layer. Rubber hose. 6. At least one of the plurality of fibers
The book is spirally wound on the surface to be reinforced while the reinforcing angle with respect to the tube axis is substantially equal to the static angle, and the fiber spacing is substantially constant between the spirally wound fibers. The other fiber is spirally wound in the state.
The tapered rubber hose as described.