JP7060987B2 - How to wind the flexible pipe and its reinforcing cord - Google Patents

Description

The present disclosure relates to a method of winding a flexible pipe and a reinforcing cord thereof.

The conventional flexible tube has a flexible tubular portion having a tubular main body portion, an annular sealing portion extending radially outward from the axial end portion of the main body portion, and the inside of the sealing portion. There is a flexible joint provided with an annular reinforcing member made of a reinforcing cloth and flanges provided on both ends in the axial direction of the flexible tubular portion (see, for example, Patent Document 1). This flange has a sheet metal so as to form at least a cylindrical inner peripheral plate portion fixed to the outer periphery of the axial end portion of the main body portion and an annular receiving plate portion fixed to the back surface of the sealing portion. It is folded back.

Japanese Unexamined Patent Publication No. 2012-57781

By the way, in the flexible tube as described above, there is a problem that durability should be improved with a simple structure.

An object of the present disclosure is to improve durability with a simple configuration.

In the present disclosure, a tubular member having an inner layer and an outer layer and having flexibility is arranged so as to be embedded between the inner layer and the outer layer at both ends in the axial direction of the tubular member. A pair of inner members having a cylinder portion and a flange portion extending radially outward from an axially outer end portion of the cylinder portion, and a reinforcing cord embedded between the inner layer and the outer layer, and a reinforcing cord is the cylinder of the inner member. A reinforcing cord layer formed by folding back at a folded-back portion composed of portions and being wound around the folded-back portions of the inner layer and both inner members in a state of reciprocating between the folded-back portions a plurality of times, and both ends in the axial direction of the tubular member. It is a flexible tube provided with a pair of flanges arranged so as to be positioned inward in the axial direction from the flange portion of each of the inner members. Then, the reinforcing cord is wound in a state where the inclination angle of the tubular member with respect to the axis is maintained within a predetermined angle range near the angle of repose at the portion between the folded portions, and the reinforcing cord is wound around each folded portion from one round. After being wound by a large predetermined number of turns, it is folded back toward the folded-back portion on the opposite side.

According to this, the inclination angle of the reinforcing cord with respect to the axis of the tubular member is maintained within a predetermined angle range near the angle of repose in the portion between the folded portions of the inner member formed by the tubular portion, so that the tubular member can be provided. The internal pressure is evenly received. Therefore, the amount of extension of the tubular member in the axial direction when receiving internal pressure is reduced.

In particular, axial elongation of the tubular member when subjected to internal pressure is likely to occur at the boundary between the inner layer of the tubular member and the inner end of the tubular portion of the inner member in the axial direction. Since the inclination angle with respect to the axis is maintained in a predetermined angle range near the angle of repose near the boundary portion, the amount of axial extension of the tubular member when receiving internal pressure is further reduced.

Further, since the reinforcing cord is wound around each folded portion by a predetermined number of turns larger than one turn and then folded toward the folded portion on the opposite side, the reinforcing cord is caught at each folded portion. Therefore, it is possible to prevent the reinforcing cord from slipping or unraveling without separately providing a hooking member or a hooking portion for hooking the reinforcing cord at each folded portion. Therefore, the inclination angle of the reinforcing cord with respect to the axis of the tubular member can be reliably maintained within a predetermined angle range near the angle of repose at the portion between the folded portions.

From the above, durability can be improved with a simple configuration.

In the present disclosure, a folded portion having an inner layer and an outer layer, which is embedded between a flexible tubular member and the inner layer and the outer layer, and a reinforcing cord is formed at each axial end of the inner layer. It is a flexible tube provided with a reinforcing cord layer which is wound around the inner layer in a state of being folded back at and reciprocating between the folded portions a plurality of times. Then, the reinforcing cord is wound in a state where the inclination angle of the tubular member with respect to the axis is maintained within a predetermined angle range near the angle of repose at the portion between the folded portions, and the reinforcing cord is wound around each folded portion from one round. After being wound by a large predetermined number of turns, it is folded back toward the folded-back portion on the opposite side.

According to this, the inclination angle of the reinforcing cord with respect to the axis of the tubular member is maintained within a predetermined angle range near the angle of repose at the portion between the folded portions formed at both ends in the axial direction of the inner layer. Is evenly affected by the internal pressure. Therefore, the amount of extension of the tubular member in the axial direction when receiving internal pressure is reduced.

Further, since the reinforcing cord is wound around each folded portion by a predetermined number of turns larger than one turn and then folded toward the folded portion on the opposite side, the reinforcing cord is caught at each folded portion. Therefore, it is possible to prevent the reinforcing cord from slipping or unraveling without separately providing a hooking member or a hooking portion for hooking the reinforcing cord at each folded portion. Therefore, the inclination angle of the reinforcing cord with respect to the axis of the tubular member can be reliably maintained within a predetermined angle range near the angle of repose at the portion between the folded portions.

From the above, durability can be improved with a simple configuration.

It is preferable that the reinforcing cord layer is coated with an adhesive.

According to this, since the adhesive is applied to the reinforcing cord layer, the tubular member, the reinforcing cord, and the reinforcing cords are integrated with each other, and the rigidity thereof is improved. Therefore, it is possible to prevent the tubular member from becoming thin or damaged due to the tubular member, the reinforcing cord, and the reinforcing cords rubbing against each other. Therefore, the durability can be further improved.

The present disclosure is a method of winding a reinforcing cord in a flexible tube. The flexible tube has an inner layer and an outer layer, and is disposed of a flexible tubular member and embedded at both ends of the tubular member in the axial direction between the inner layer and the outer layer. Further, a pair of inner members having a tubular portion and a flange portion extending radially outward from the axially outer end of the tubular portion are embedded between the inner layer and the outer layer, and the reinforcing cord is embedded in the inner member. A reinforcing cord layer formed by being wrapped around the inner layer and the folded portions of both inner members in a state of being folded back at the folded portion formed of the tubular portion and reciprocating between the folded portions a plurality of times, and a shaft of the tubular member. A pair of flanges are provided at both ends in the direction so as to be positioned inward in the axial direction with respect to the flange portion of each of the inner members. The reinforcing cord is wound in a state where the inclination angle of the tubular member with respect to the axis is maintained within a predetermined angle range near the angle of repose in the portion between the folded portions, and is larger than one round around each folded portion. After being wound by a predetermined number of turns, it is folded back toward the folded-back portion on the opposite side. Then, in the method of winding the reinforcing cord, after molding an intermediate product having the inner layer and both inner members, the reinforcing cord is attached at a portion where the inclination angle of the tubular member with respect to the axis is between the folded portions. It is wound around the intermediate product so as to be maintained within the predetermined angle range, and is wound around each folded portion by the predetermined number of turns and then folded toward the opposite folded portion.

According to this, for the same reason as described above, durability can be improved with a simple configuration.

The present disclosure is a method of winding a reinforcing cord in a flexible pipe. The flexible tube has an inner layer and an outer layer, is embedded between the flexible tubular member and the inner layer and the outer layer, and a reinforcing cord is formed at each axial end of the inner layer. The reinforcing cord layer is provided with a reinforcing cord layer that is folded back at the folded portion and wound around the inner layer in a state of reciprocating between the both folded portions a plurality of times. It is wound while being maintained in a predetermined angle range near the angle of repose in the part between them, and is wound around each of the above-mentioned folded portions by a predetermined number of turns larger than one turn, and then folded toward the opposite folded portion. .. Then, in the method of winding the reinforcing cord, after molding the intermediate product having the inner layer, the reinforcing cord is maintained within the predetermined angle range in the portion where the inclination angle of the tubular member with respect to the axis is between the folded portions. It is wound around the intermediate product as described above, and after being wound around each of the folded portions by the predetermined number of turns, it is folded back toward the folded portion on the opposite side.

According to this, for the same reason as described above, durability can be improved with a simple configuration.

It is preferable to apply the adhesive directly to the reinforcing cord and then wind the reinforcing cord coated with the adhesive.

According to this, after the adhesive is applied directly to the reinforcing cord, the reinforcing cord coated with the adhesive is wound, so that the tubular member, the reinforcing cord, and the reinforcing cord are more integrated with each other, and the rigidity thereof is further improved. .. Therefore, it is possible to further prevent the tubular member from being thinned or damaged due to the tubular member and the reinforcing cord and the reinforcing cord rubbing against each other. Therefore, the durability can be further improved.

A mandrel rotatably configured around the axis and supporting the intermediate product, a guide rail extending in parallel with the mandrel, and a position corresponding to both folded portions of the intermediate product supported by the mandrel on the guide rail. A guide mechanism having a slider that is slidably engaged while passing between the intermediate products and guides the reinforcing cord to the intermediate product supported by the mandrel is provided, and the reinforcing cord is provided. The slider is guided to the intermediate product, and the mandrel supporting the intermediate product is rotated around its axis, and the slider is reciprocated between the positions corresponding to both folded portions of the intermediate product to reinforce the reinforcement. The cord is wound so that the inclination angle of the tubular member with respect to the axis is maintained within the predetermined angle range between the folded portions, and the reinforcing cord is guided to the intermediate product from the slider and the intermediate product is provided. It is preferable to wind the reinforcing cord around each folded portion by the predetermined number of turns by stopping the slider at a position corresponding to each folded portion of the intermediate product while rotating the supported mandrel around its axis.

According to this, the slider slides while passing in the vicinity of the intermediate product between the positions corresponding to the double-folded portions of the intermediate product supported by the mandrel, so that the slider moves in comparison with the case where the intermediate product passes far away. , It is possible to prevent the reinforcing cord guided from the slider to the intermediate product from bending. Therefore, the reinforcing cord can be extended in any direction. Therefore, the method of winding the reinforcing cord according to the present disclosure can be surely embodied.

According to the present disclosure, durability can be improved with a simple configuration.

It is one side sectional view which shows the flexible joint which concerns on Embodiment 1. FIG. It is a top view explaining the method of winding a reinforcing cord using a winding device. It is a one-sided sectional view which shows the flexible tube which concerns on Embodiment 2. FIG.

Hereinafter, embodiments will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a one-sided cross-sectional view showing a flexible joint (flexible pipe), and FIG. 2 is a plan view illustrating a method of winding a reinforcing cord using a winding device. Although not shown, the flexible joint 1 is, for example, a vibration-proof joint for a pump that connects water pipes around the pump and prevents pump vibration from being transmitted from the pipe on the pump side to the pipe on the opposite side of the pump. be. As shown in FIGS. 1 and 2, the flexible joint 1 includes a tubular member 2, a pair of inner metal fittings 3, 3 (inner members), a reinforcing cord layer 4, and a pair of flanges 5, 5. There is.

The tubular member 2 is a member that allows deformation due to its internal pressure. The tubular member 2 is made of flexible rubber. The tubular member 2 is formed in a cylindrical shape. At the central portion in the axial direction of the tubular member 2, a spherical bulging portion 20 in which the central portion in the axial direction bulges outward in the radial direction is formed. The tubular member 2 has an inner layer 21 and an outer layer 22.

The inner layer 21 is made of, for example, ethylene propylene diene rubber (EPDM). The inner layer 21 has an axial length longer than that of the outer layer 22. Both ends of the inner layer 21 in the axial direction extend in the axial direction along the inner peripheral surface of the tubular portion 30 described later in the inner metal fitting 3, and then follow the outer end surface in the axial direction of the flange portion 31 described later in the inner metal fitting 3. Extends radially outward.

The outer layer 22 is made of rubber different from that of the inner layer 21, and is made of, for example, natural rubber or styrene-butadiene rubber (SBR). The outer layer 22 is formed on the radial outer side of the inner layer 21. Both ends of the outer layer 22 in the axial direction extend in the axial direction along the outer peripheral surface of the tubular portion 30 of the inner metal fitting 3.

The inner metal fittings 3 are arranged at both ends of the tubular member 2 in the axial direction. The inner metal fitting 3 has a tubular portion 30 and a flange portion 31. The axially inner portion of the tubular portion 30 is embedded between the inner layer 21 and the outer layer 22 of the tubular member 2. The tubular portion 30 is formed in a cylindrical shape. The axis of the tubular portion 30 coincides with the axis of the tubular member 2. The tubular portion 30 is in contact with the inner tubular portion 51 of the flange 5, which will be described later. At the axially inner end of the tubular portion 30, an inclined portion 30a extending radially outward as it goes inward in the axial direction along the inner peripheral surface of the reinforcing cord layer 4 is formed. The inclined portion 30a is a portion that prevents the reinforcing cord layer 4 from coming off from the inner metal fitting 3.

The flange portion 31 is a portion of the flange 5 that receives the ring portion 50 described later. The flange portion 31 is also a portion that prevents the flange 5 from coming off from the flexible joint 1. The flange portion 31 extends radially outward from the axially outer end of the tubular portion 30. The collar portion 31 is formed in an annular shape.

The reinforcing cord layer 4 is a member that integrally reinforces the inner layer 21 of the tubular member 2 and the inner metal fitting 3. The reinforcing cord layer 4 is embedded between the inner layer 21 and the tubular portions 30 of both inner metal fittings 3 and 3 and the outer layer 22. The reinforcing cord layer 4 is formed in a cylindrical shape. The axis of the reinforcing cord layer 4 coincides with the axis of the tubular member 2. The axially central portion of the reinforcing cord layer 4 has a spherical shape in which the axially central portion bulges outward in the radial direction along the bulging portion 20 of the tubular member 2. In the reinforcing cord layer 4, the reinforcing cord 40 is folded back at the folded-back portion 30b formed of the inner portion of the tubular portion 30 of the inner metal fitting 3 in the axial direction, and the reinforcing cord 40 is folded back a plurality of times (for example, 100) between the folded-back portions 30b and 30b. (Times) In a reciprocating state, it is wound around the folded-back portion 30b of the inner layer 21 and both inner metal fittings 3 and 3. In FIG. 1, the reinforcing cord 40 is not shown in order to make the figure easier to see.

The reinforcing cord 40 is made of, for example, polyester or aramid fiber. The reinforcing cord 40 is arranged while shifting by a predetermined pitch in the circumferential direction for each round trip. In the reinforcing cord 40, the inclination angle θ with respect to the axis C of the tubular member 2 is the entire portion between the folded portions 30b and 30b, specifically, the entire portion corresponding to the bulging portion 20 in the inner layer 21 of the tubular member 2. It is wound while being maintained within a predetermined angle range near the angle of repose. This predetermined angle range is, for example, 40 to 60 degrees, preferably 45 to 50 degrees.

The reinforcing cord 40 is wound around each folded-back portion 30b by a little over one turn, and then folded back toward the opposite folded-back portion 30b. The inclination angle θ of the reinforcing cord 40 with respect to the axis C of the tubular member 2 is 90 degrees at each folded portion 30b. The reinforcing cord 40 is wound around the folded-back portion 30b for a little over one turn at each turn-back, but the winding position is shifted for each turn-back so that the reinforcing cord 40 is not concentrated at one place of the folded-back portion 30b and is evenly distributed.

An adhesive (not shown) is directly applied to the reinforcing cord 40 after being unwound from the bobbin 60 of the winding device 6 described later and before reaching the guide mechanism 62. This adhesive comprises, for example, a vulcanized adhesive for elastomers or a rubber glue.

The flange 5 is a member to which the water pipe is connected. The flange 5 is made of metal. The flanges 5 are arranged at both ends of the tubular member 2 in the axial direction so as to be located inside the flanges 31 of the inner metal fittings 3 and 3 in the axial direction. The flange 5 has a ring portion 50, an inner cylinder portion 51, and an outer cylinder portion 52. The ring portion 50 is formed in an annular shape. The axis of the ring portion 50 coincides with the axis of the tubular member 2. The inner cylinder portion 51 extends axially inward from the inner peripheral edge portion of the ring portion 50. The outer cylinder portion 52 extends axially outward from the outer peripheral edge portion of the ring portion 50. The inner cylinder portion 51 and the outer cylinder portion 52 are formed in a cylindrical shape. The inner diameter of the flange 5 (inner cylinder portion 51) is smaller than the outer diameter of the flange portion 31. The inner cylinder portion 51 is arranged so as to form a slight gap in the axial direction between the inner cylinder portion 51 and the outer layer 22 of the cylinder member 2.

Hereinafter, the winding device 6 around which the reinforcing cord 40 is wound will be described.

As shown in FIG. 2, the winding device 6 includes a bobbin 60, a mandrel 61, and a guide mechanism 62. The bobbin 60 is a member around which the reinforcing cord 40 is wound before being wound around the first intermediate product 1a described later of the flexible joint 1. The bobbin 60 is formed in a columnar shape. The bobbin 60 is rotatable around its axis. The reinforcing cord 40 wound around the bobbin 60 is paid out to the guide mechanism 62.

The mandrel 61 is a member that supports the first intermediate product 1a. The mandrel 61 is formed in a columnar shape. The axis of the mandrel 61 coincides with the axis C of the first intermediate product a. The mandrel 61 is rotatable around its axis. The mandrel 61 rotates around its axis to wind the reinforcing cord 40 unwound from the bobbin 60 onto the first intermediate product 1a supported by the mandrel 61.

The guide mechanism 62 is a linear guide that guides the reinforcing cord 40 unwound from the bobbin 60 to the first intermediate product 1a supported by the mandrel 61. The guide mechanism 62 has a guide rail 63 and a slider 64. The guide rail 63 extends in parallel with the mandrel 61 in the vicinity of the mandrel 61.

The slider 64 has a main body portion 64a and a guide portion 64b. The main body portion 64a is formed in a rectangular parallelepiped shape. The main body portion 64a is engagedly supported by the guide rail 63 so as to be slidable.

The guide portion 64b is a rod-shaped member extending from the main body portion 64a toward the mandrel 61 in a direction orthogonal to the axial direction thereof. The tip of the guide portion 64b is located inside the flange 5 of the first intermediate product 1a in the radial direction and between the flanges 5 and 5. A guide hole 64c is formed at the tip of the guide portion 64b. The guide portion 64b feeds the reinforcing cord 40 unwound from the bobbin 60 to the first intermediate product 1a through the guide hole 64c. The feeding direction of the reinforcing cord 40 drawn from the guide portion 64b to the first intermediate product 1a is set to coincide with the direction orthogonal to the axial direction of the mandrel 61 when the slider 64 is stopped. The guide portion 64b is a mandrel while passing the vicinity of the first intermediate product 1a between the positions corresponding to both the folded-back portions 30b and 30b of the first intermediate product 1a by sliding the main body portion 64a on the guide rail 63. It reciprocates in the axial direction of 61.

The moving speed of the slider 64 is set to a predetermined speed such that the inclination angle θ of the reinforcing cord 40 with respect to the axis C of the tubular member 2 is maintained within a predetermined angle range near the angle of repose. The stop time of the guide portion 64b at the position corresponding to each folded portion 30b of the first intermediate product 1a and the rotation speed of the mandrel 61 are opposite after the reinforcing cord 40 is wound around each folded portion 30b by a little over one turn. It is set to a predetermined time and a predetermined rotation speed so as to be folded toward the folded portion 30b on the side.

Hereinafter, a method of winding the reinforcing cord 40 using the winding device 6 will be described.

First, the unvulcanized inner layer sheet 21a constituting the inner layer 21 is wound around the mandrel 61. The axial length of the inner layer sheet 21a is larger than that of the inner layer 21 of the finished product (hereinafter, simply referred to as a finished product) of the flexible joint 1. Next, the inner metal fitting 3 and the flange 5 are arranged on the inner layer sheet 21a supported by the mandrel 61 at positions corresponding to the inner metal fitting 3 and the flange 5 of the finished product, respectively. As a result, the first intermediate product 1a of the flexible joint 1 having the inner layer sheet 21a, the inner metal fitting 3, and the flange 5 is formed.

Next, the reinforcing cord 40 is fed from the bobbin 60 to the guide mechanism 62. At this time, the adhesive is directly applied to the reinforcing cord 40 after being fed out from the bobbin 60 and before reaching the guide mechanism 62.

Next, the reinforcing cord 40 coated with the adhesive is guided from the guide portion 64b of the slider 64 to the first intermediate product 1a supported by the mandrel 61, and the slider 64 is moved while rotating the mandrel 61 around its axis. By sliding the guide portion 64b on the guide rail 63, the guide portion 64b is reciprocated in the axial direction of the mandrel 61 between the positions corresponding to the double-folded portions 30b and 30b of the first intermediate product 1a. As a result, the reinforcing cord 40 coated with the adhesive is folded back at the folded-back portion 30b and reciprocated between the folded-back portions 30b and 30b, and is applied to the first intermediate product 1a, specifically, the inner layer in the inner layer sheet 21a. It is wound around the portion corresponding to 21 and the folded-back portion 30b of both inner metal fittings 3 and 3.

At this time, since the moving speed of the slider 64 is set to a predetermined speed so that the inclination angle θ of the reinforcing cord 40 with respect to the axis C of the tubular member 2 is maintained within a predetermined angle range near the angle of repose, the adhesive is used. The reinforcing cord 40 coated with the above is wound so that its inclination angle θ is maintained within a predetermined angle range over the entire portion between the folded-back portions 30b and 30b.

Further, the guide portion 64b is stopped at a position corresponding to each folded portion 30b. At this time, the stop time of the guide portion 64b and the rotation speed of the mandrel 61 are set to a predetermined time and predetermined time so that the reinforcing cord 40 is wound around each folded portion 30b by a little over one turn and then folded toward the opposite folded portion 30b. Since the rotation speed is set for each, the reinforcing cord 40 coated with the adhesive is wound around each folded-back portion 30b by a little over one turn and then folded back toward the opposite folded-back portion 30b.

Then, when the number of round trips of the reinforcing cord 40 reaches a plurality of times (for example, 100 times), the winding of the reinforcing cord 40 using the winding device 6 is completed.

Then, the inner layer sheet 21a is cut to the size of the inner layer 21 of the finished product. Next, the unvulcanized outer layer sheet 22 is wound around the cut inner layer sheet 21a and the folded-back portion 30b of both inner metal fittings 3 and 3. As a result, the second intermediate product of the flexible joint 1 having the inner layer 21, the outer layer 22, the inner metal fitting 3, and the flange 5 is formed. Next, the second intermediate product is removed from the mandrel 61. Then, the second intermediate product is set in a mold (not shown) and integrally molded by vulcanization. As a result, the finished product of the flexible joint 1 is formed.

-effect-
From the above, according to the present embodiment, the inclination angle θ of the tubular member 2 with respect to the axis C is stationary in the entire portion between the folded portions 30b and 30b formed by the tubular portion 30 of the inner metal fitting 3. Since it is maintained within a predetermined angle range near the corner, the tubular member 2 receives the internal pressure evenly. Therefore, the amount of extension of the tubular member 2 in the axial direction when receiving internal pressure is reduced.

In particular, axial elongation of the tubular member 2 when subjected to internal pressure is likely to occur at the boundary between the inner layer 21 of the tubular member 2 and the axially inner end of the tubular portion 30 of the inner metal fitting 3, but it is reinforced. Since the inclination angle θ of the cord 40 with respect to the axis C of the tubular member 2 is maintained within a predetermined angle range near the angle of repose near the boundary portion, the amount of extension of the tubular member 2 in the axial direction when receiving internal pressure is higher. Reduce.

Further, since the reinforcing cord 40 is wound around each folded-back portion 30b by a little over one turn and then folded back toward the opposite folded-back portion 30b, the reinforcing cord 40 is caught by each folded-back portion 30b. Therefore, it is possible to prevent the reinforcing cord 40 from slipping or unraveling without separately providing a hooking member or a hooking portion for hooking the reinforcing cord 40 at each folded-back portion 30b. Therefore, the inclination angle θ of the tubular member 2 with respect to the axis C of the reinforcing cord 40 can be reliably maintained within a predetermined angle range near the angle of repose in the entire portion between the folded portions 30b and 30b.

From the above, durability can be improved with a simple configuration.

Further, since the reinforcing cord 40 to which the adhesive is applied is wound after the adhesive is applied directly to the reinforcing cord 40, the tubular member 2 and the reinforcing cord 40 and the reinforcing cord 40 are more integrated with each other, and the rigidity thereof is further increased. improves. Therefore, it is possible to further prevent the tubular member 2 from becoming thin or damaged due to the tubular member 2, the reinforcing cord 40, and the reinforcing cord 40 rubbing against each other. Therefore, the durability can be further improved.

Further, since the slider 64 slides and moves between the positions corresponding to the folded portions 30b and 30b of the first intermediate product 1a supported by the mandrel 61 while passing in the vicinity of the first intermediate product 1a, the first intermediate product 1a is formed. Compared with the case where the product 1a passes far away, it is possible to prevent the reinforcing cord 40 guided from the slider 64 to the first intermediate product 1a from bending. Therefore, the reinforcing cord 40 can be extended in any direction. Therefore, the method of winding the reinforcing cord 40 according to the present disclosure can be surely embodied.

In the present embodiment, the inner metal fitting 3 and the flange 5 are separated, but the present invention is not limited to this, and the inner metal fitting 3 and the flange 5 may be integrally formed.

(Embodiment 2)
The present embodiment is different from the first embodiment in that it is a flexible pipe not provided with the inner metal fitting 3 and the flanges 5 and 5, but has the same configuration as the first embodiment in other points. Therefore, in the following description, duplicate description may be omitted for the same components as those of the first embodiment.

FIG. 3 is a one-sided cross-sectional view showing a flexible tube. Although not shown, the flexible pipe 101 is, for example, a vibration-proof water pipe that prevents vibration from being transmitted from one side to the other. As shown in FIG. 3, the flexible tube 101 includes a tubular member 2 and a reinforcing cord layer 4.

The inner layer 21 of the tubular member 2 has the same axial length as the outer layer 22. The reinforcing cord layer 4 is a member that reinforces the tubular member 2. The reinforcing cord layer 4 is embedded between the inner layer 21 and the outer layer 22. In the reinforcing cord layer 4, the reinforcing cord 40 (see FIG. 2) is folded back at the folded-back portion 23 formed by each axial end portion of the inner layer 21, and the reinforcing cord layer 4 is folded back a plurality of times (for example, between the folded-back portions 23, 23). It is wound around the inner layer 21 in a state of reciprocating (100 times). In FIG. 3, the reinforcing cord 40 is not shown in order to make the figure easier to see. Further, the reinforcing cord 40 is not wound around the portion between each axial end of the inner layer 21 and its vicinity.

In the reinforcing cord 40, the inclination angle θ (see FIG. 2) of the tubular member 2 with respect to the axis C is the entire portion between the folded portions 23, 23, specifically, the bulging portion in the inner layer 21 of the tubular member 2. The entire portion corresponding to 20 is wound in a state of being maintained within a predetermined angle range near the angle of repose. The reinforcing cord 40 is wound around each folded-back portion 23 by a little over one turn, and then folded back toward the opposite folded-back portion 23.

Hereinafter, a method of winding the reinforcing cord 40 using the winding device 6 configured as described above will be described with reference to FIG. 2.

First, the inner layer sheet 21a constituting the inner layer 21 is wound around the mandrel 61. As a result, the first intermediate product of the flexible tube 1 having the inner layer sheet 21a is formed.

Next, the reinforcing cord 40 is fed from the bobbin 60 to the guide mechanism 62. At this time, the adhesive is directly applied to the reinforcing cord 40 after being fed out from the bobbin 60 and before reaching the guide mechanism 62.

Next, the reinforcing cord 40 coated with the adhesive is guided from the guide portion 64b of the slider 64 to the first intermediate product supported by the mandrel 61, and the slider 64 is guided while rotating the mandrel 61 around its axis. By sliding the guide portion 64b on the rail 63, the guide portion 64b is reciprocated in the axial direction of the mandrel 61 between the positions corresponding to both the folded portions 23 and 23 of the first intermediate product. As a result, the reinforcing cord 40 coated with the adhesive is folded back at the folded-back portion 23 and reciprocated between the folded-back portions 23, 23, and is used as the first intermediate product, specifically, the shaft in the inner layer sheet 21a. It is wound around a portion corresponding to the inner layer 21 excluding the portion between each end in the direction and the vicinity thereof.

At this time, since the moving speed of the slider 64 is set to a predetermined speed so that the inclination angle θ of the reinforcing cord 40 with respect to the axis C of the tubular member 2 is maintained within a predetermined angle range near the angle of repose, the adhesive is used. The reinforcing cord 40 coated with the above is wound so that its inclination angle θ is maintained within a predetermined angle range in the entire portion between the folded-back portions 23, 23.

Further, the guide portion 64b is stopped at a position corresponding to each folded portion 23. At this time, the stop time of the guide portion 64b and the rotation speed of the mandrel 61 are set to a predetermined time and predetermined time so that the reinforcing cord 40 is wound around each folded portion 23 by a little over one turn and then folded toward the opposite folded portion 23. Since the rotation speed is set for each, the reinforcing cord 40 coated with the adhesive is wound around each folded-back portion 23 by a little over one turn and then folded back toward the opposite folded-back portion 23.

Then, when the number of round trips of the reinforcing cord 40 reaches a plurality of times (for example, 100 times), the winding of the reinforcing cord 40 using the winding device 6 is completed.

Then, the inner layer sheet 21a is cut to the size of the inner layer 21 of the finished product. Next, the unvulcanized outer layer sheet 22 is wound around the cut inner layer sheet 21a. As a result, the second intermediate product of the flexible tube 101 having the inner layer 21 and the outer layer 22 is formed. Next, the second intermediate product is removed from the mandrel 61. Then, the second intermediate product is set in a mold and integrally molded by vulcanization. As a result, the finished product of the flexible tube 101 is molded.

-effect-
From the above, according to the present embodiment, the same effect as that of the first embodiment can be obtained. Specifically, the inclination angle θ of the tubular member 2 with respect to the axis C of the reinforcing cord 40 is a predetermined angle near the angle of repose in the entire portion between the folded-back portions 23, 23 formed by both ends in the axial direction of the inner layer 21. Since it is maintained within the range, the tubular member 2 receives the internal pressure evenly. Therefore, the amount of extension of the tubular member 2 in the axial direction when receiving internal pressure is reduced.

Further, since the reinforcing cord 40 is wound around each folded-back portion 23 by a little over one turn and then folded back toward the opposite folded-back portion 23, the reinforcing cord 40 is caught by each folded-back portion 23. Therefore, it is possible to prevent the reinforcing cord 40 from slipping or unraveling without separately providing a hooking member or a hooking portion for hooking the reinforcing cord 40 at each folded-back portion 23. Therefore, the inclination angle θ of the tubular member 2 with respect to the axis C of the reinforcing cord 40 can be reliably maintained within a predetermined angle range near the angle of repose in the entire portion between the folded portions 23 and 23.

From the above, durability can be improved with a simple configuration.

(Other embodiments)
In each of the above embodiments, the inclination angle θ of the reinforcing cord 40 with respect to the axis C of the tubular member 2 is maintained within a predetermined angle range near the angle of repose in the entire portion corresponding to the bulging portion 20 in the inner layer 21 of the tubular member 2. In addition to the entire portion corresponding to the bulging portion 20, in the first embodiment, both the tubular portions 30 of the inner metal fittings 3 and 3 and in the second embodiment, both ends of the inner layer 21 in the axial direction have a predetermined angle range. May be maintained at. In this case, the axial length of the folded-back portion 30b; 23 is shortened by the amount that the tubular portions 30 of the inner metal fittings 3 and 3 and both ends of the inner layer 21 in the axial direction are maintained within a predetermined angle range.

Further, in each of the above embodiments, the reinforcing cord 40 is wound around each folded-back portion 30b; 23 by a little over one lap and then folded back toward the opposite folded-back portion 30b; 23, but with a predetermined number of laps larger than one lap. You can wrap it around as many times as you like. However, in terms of simple configuration, it is desirable to wind only a little over one lap.

Further, in each of the above embodiments, the reinforcing cord 40 to which the adhesive is applied is wound after the adhesive is directly applied to the reinforcing cord 40, but the present invention is not limited to this, and for example, the reinforcing cord 40 is wound and then bonded. The agent may be applied to the surface of the reinforcing cord layer 4. However, in terms of improving durability, it is preferable to wind the adhesive after applying it.

Further, in each of the above embodiments, the bulging portion 20 is formed on the tubular member 2, but the present invention is not limited to this, and for example, the inner and outer diameters of the tubular member 2 may be constant.

Hereinafter, specific examples will be described.

(Test product)
As the test products according to Examples 1 and 2 and Comparative Example, those having the same configuration as the flexible joint according to the above embodiment were prepared.

In the test product according to Example 1, the adhesive was applied directly to the reinforcing cord, and then the reinforcing cord coated with the adhesive was wound. Further, the reinforcing cord was wound in a state where the inclination angle with respect to the axis of the tubular member was maintained within a predetermined angle range near the angle of repose in the entire portion corresponding to the bulging portion in the inner layer of the tubular member. Further, the reinforcing cord was wound around each folded portion by a little over one turn, and then folded toward the opposite folded portion.

In the test product according to the second embodiment, the reinforcing cord is wound in a state where the inclination angle with respect to the axis of the tubular member is maintained within a predetermined angle range near the angle of repose in the entire portion corresponding to the bulging portion in the inner layer of the tubular member. .. Further, the reinforcing cord was wound around each folded portion by a little over one turn, and then folded toward the opposite folded portion. Further, after winding the reinforcing cord, an adhesive was applied to the surface of the reinforcing cord layer.

On the other hand, in the test product according to the comparative example, the reinforcing cord is set within a predetermined angle range near the angle of repose at the central portion in the axial direction of the portion where the inclination angle of the tubular member with respect to the axis corresponds to the bulging portion in the inner layer of the tubular member. It was wound while being maintained at an angle larger than the upper limit of this predetermined angle range at both ends in the axial direction. Further, the reinforcing cord was wound around each folded portion by only a quarter turn, and then folded toward the opposite folded portion. Also, no adhesive was applied to the reinforcing cord.

(test)
The test products according to Examples 1 and 2 and Comparative Examples were subjected to an elongation amount test and a repeated pressurization / depressurization durability test specified in SHASE-S008-2008 of the Air Conditioning and Sanitary Engineering Society standard, respectively.

(Test results)
The test results are shown in Table 1. In the elongation test results in Table 1, "○" was defined as "small elongation (pass)" and "x" was defined as "large elongation (fail)". In addition, in the pressurization / decompression repetition endurance test results in Table 1, "○" indicates "the number of pressurization / decompression repetitions until damage is large (pass)" and "×" indicates "pressurization until damage". The number of repetitions of decompression is small (failure). "

As can be seen from Table 1, in the test products according to Examples 1 and 2, the amount of axial elongation of the tubular member was considerably smaller than that of the test products according to the comparative example. Further, in the test products according to Examples 1 and 2, the number of times of repeated pressurization and depressurization until breakage was larger than that of the test products according to the comparative example. Further, in the test product according to Example 1, the number of repetitions of pressurization and depressurization was considerably larger than that of the test product according to Example 2.

From the above, the durability of the test products according to Examples 1 and 2 was considerably higher than that of the test products according to the comparative example.

As described above, the present disclosure can be applied to flexible pipes and the like.

1 Flexible joint (flexible pipe)
1a 1st intermediate product 2 Cylinder member 21 Inner layer
22 Outer layer 23 Folded part 3 Inner metal fittings (inner member)
30 Cylinder 30b Folded portion 31 Flange 4 Reinforcing cord layer 40 Reinforcing cord 5 Flange 6 Winding device 61 Mandrel 62 Guide mechanism 63 Guide rail 64 Slider 101 Flexible tube C Cylinder member (first intermediate product) shaft θ Reinforcing cord Inclination angle with respect to the axis of the tubular member

Claims (7)

A tubular member that has an inner layer and an outer layer and has flexibility,
A flange portion that is disposed so as to be embedded between the inner layer and the outer layer at both ends of the tubular member in the axial direction and extends radially outward from the tubular portion and the axially outer end portion of the tubular portion. With a pair of inner members having
The inner layer and both inner members are embedded between the inner layer and the outer layer, and the reinforcing cord is folded back at a folded portion formed of a tubular portion of the inner member and reciprocated a plurality of times between the folded portions. Reinforcing cord layer wrapped around the folded part of
A pair of flanges are provided at both ends of the tubular member in the axial direction so as to be positioned axially inside the flange of each inner member.
The reinforcing cord is wound in a state where the inclination angle of the tubular member with respect to the axis is maintained within a predetermined angle range near the angle of repose in the portion between the folded portions, and is larger than one round around each folded portion. A flexible tube that has been wound by a predetermined number of turns and then folded back toward the opposite folded-back portion. A tubular member that has an inner layer and an outer layer and has flexibility,
It is embedded between the inner layer and the outer layer, and the reinforcing cord is folded back at a folded portion formed by each axial end portion of the inner layer and wound around the inner layer in a state of reciprocating between both folded portions a plurality of times. Equipped with a reinforcing cord layer
The reinforcing cord is wound in a state where the inclination angle of the tubular member with respect to the axis is maintained within a predetermined angle range near the angle of repose in the portion between the folded portions, and is larger than one round around each folded portion. A flexible tube that has been wound by a predetermined number of turns and then folded back toward the opposite folded-back portion. In claim 1 or 2,
A flexible tube to which an adhesive is applied to the reinforcing cord layer. It is a method of winding a reinforcing cord in a flexible pipe.
The flexible tube is
A tubular member that has an inner layer and an outer layer and has flexibility,
A flange portion that is disposed so as to be embedded between the inner layer and the outer layer at both ends of the tubular member in the axial direction and extends radially outward from the tubular portion and the axially outer end portion of the tubular portion. With a pair of inner members having
The inner layer and both inner members are embedded between the inner layer and the outer layer, and the reinforcing cord is folded back at a folded portion formed of a tubular portion of the inner member and reciprocated a plurality of times between the folded portions. Reinforcing cord layer wrapped around the folded part of
A pair of flanges are provided at both ends of the tubular member in the axial direction so as to be positioned axially inside the flange of each inner member.
The reinforcing cord is wound in a state where the inclination angle of the tubular member with respect to the axis is maintained within a predetermined angle range near the angle of repose in the portion between the folded portions, and is larger than one round around each folded portion. After being wound a predetermined number of turns, it is folded back toward the opposite folding part,
After molding an intermediate product having the inner layer and both inner members,
The reinforcing cord is wound around the intermediate product so that the inclination angle of the tubular member with respect to the axis is maintained within the predetermined angle range at the portion between the folded portions, and the number of turns is increased around each folded portion. A method of wrapping a reinforcing cord that wraps around and then folds back toward the folded part on the opposite side. It is a method of winding a reinforcing cord in a flexible pipe.
The flexible tube is
A tubular member that has an inner layer and an outer layer and has flexibility,
It is embedded between the inner layer and the outer layer, and the reinforcing cord is folded back at a folded portion formed by each axial end portion of the inner layer and wound around the inner layer in a state of reciprocating between both folded portions a plurality of times. Equipped with a reinforcing cord layer
The reinforcing cord is wound in a state where the inclination angle of the tubular member with respect to the axis is maintained within a predetermined angle range near the angle of repose in the portion between the folded portions, and is larger than one round around each folded portion. After being wound a predetermined number of turns, it is folded back toward the opposite folding part,
After molding the intermediate product having the inner layer,
The reinforcing cord is wound around the intermediate product so that the inclination angle of the tubular member with respect to the axis is maintained within the predetermined angle range at the portion between the folded portions, and the number of turns is increased around each folded portion. A method of wrapping a reinforcing cord that wraps around and then folds back toward the folded part on the opposite side. In claim 4 or 5,
A method of winding a reinforcing cord, in which an adhesive is applied directly to the reinforcing cord and then the reinforcing cord coated with the adhesive is wound. In any one of claims 4 to 6,
A mandrel that is rotatably configured around its axis and supports the above intermediate product,
The guide rail extending in parallel with the mandrel and the guide rail are engaged with the guide rail so as to be slidably movable while passing in the vicinity of the mandrel between the positions corresponding to both folded portions of the intermediate product supported by the mandrel. A guide mechanism having a slider for guiding the reinforcing cord to the intermediate product supported by the mandrel is provided.
Guide the reinforcing cord from the slider to the intermediate product, and move the slider back and forth between the positions corresponding to both folded portions of the intermediate product while rotating the mandrel supporting the intermediate product around its axis. The reinforcing cord is wound so that the inclination angle of the tubular member with respect to the axis is maintained within the predetermined angle range between the folded portions.
By guiding the reinforcing cord from the slider to the intermediate product and stopping the slider at a position corresponding to each folded portion of the intermediate product while rotating the mandrel supporting the intermediate product around its axis. A method of winding a reinforcing cord around each folded portion of the reinforcing cord by the predetermined number of turns.

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