JP2015209914A - Piping material connecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform smooth piping material connection.SOLUTION: This invention relates to a method for connecting the first piping material with the second piping material under application of a joint. The joint is tubular made of thermoplastic resilient material and has groove segments that are formed of: a straight pipe part constituting an intermediate part of the joint; an insertion part inserted into the first piping and the second piping coaxially and integrally formed at both sides of the straight pipe part; and melting and fixing segments coaxially and integrally formed at both sides of the straight pipe part to cover the surfaces of the end portions of the first piping material and the second piping material in a state in which the first piping material and the second piping material are inserted into the insertion part. The method includes a connecting step of inserting each of the end part of the first piping material and the end part of the second piping material into the groove segments at both ends of the joint, and applying a rotational force in a circumferential direction at an outer circumferential part of the joint in a state in which the rotations in a circumferential direction of the first piping material and the second piping material are restricted.

Description

  The present invention relates to a method for joining piping materials using a joint.

From the past, for the purpose of joining piping materials for the purpose of extending piping materials, and for the purpose of responding to changes in the usage environment of pipe materials and the properties of fluid flowing in the pipe, It is practiced to join the piping material.
The joining of these piping materials is, for example, by fitting a sealing material such as an O-ring at the end of the piping material and press-fitting into a joint having an inner diameter larger than the outer diameter of the piping material. Are connected in a sealed state.

  In addition, rotational friction welding (spin bonding) is known as one of bonding methods applicable to thermoplastic resin piping materials. For example, in Patent Document 1, one piping material is fitted with the other piping material, and at least one of the piping materials is rotated in the circumferential direction. There has been proposed a joining method in which a wall surface and an outer wall surface of the other piping material are friction-melted to fusion-bond both the piping materials.

Japanese Patent Laid-Open No. 10-38173

  However, in the joining method using the sealing material, since the piping material is sequentially press-fitted into the end portion of the joint, there is a problem that the manufacturing process increases and the manufacturing cost increases by the number of external fittings and press-fitting of the sealing material. . The joining method using a sealing material has a problem that the work is more difficult as the piping material has higher flexibility because the piping material is rotated during the press-fitting and connection of the piping material. Also, the longer the piping material, the more difficult the work is, and there was no method for joining long piping materials together.

  On the other hand, in the joining method proposed in Patent Document 1, a sealing material and a joint are unnecessary, and the number of parts can be reduced. However, since the piping material is rotated and joined while the end of one piping material is press-fitted into the end of the other piping material, the higher the flexibility of the piping material, the longer the piping material becomes. There is still a problem that is difficult. It is still difficult to apply for joining long piping materials.

  This invention is made | formed in view of the said problem, and makes it a subject to perform joining of piping materials smoothly.

  A pipe material joining method according to the present invention is a method of joining a first pipe material and a second pipe material using a joint, and the joint is a tube formed of a thermoplastic elastic material. A straight pipe part constituting an intermediate portion of the joint; and an insertion part inserted into the first pipe material and the second pipe material coaxially and integrally formed on both sides of the straight pipe part. And the straight pipe part covering the surfaces of the end parts of the first pipe material and the second pipe material in a state where the first pipe material and the second pipe material are inserted into the insertion part. A groove portion formed by a weld portion coaxially and integrally formed on both sides, and an end portion of the first piping material and an end portion of the second piping material are groove portions at both end portions of the joint. In the state where the circumferential rotation of the first piping material and the second piping material is regulated, Characterized in that it comprises a joining step of adding a rotational force in the direction.

  According to such a configuration, frictional heat is generated between the joint and the pipe by rotating only the joint by applying a rotational force to the outer periphery of the joint in a state where the rotation of the pipe material in the circumferential direction is restricted. The frictional heat makes it possible to weld the first and second piping materials having a certain length to both end portions of the joint.

  Furthermore, it is preferable that the joining method of the piping material which concerns on this invention performs the said joining process by attaching a rotational force transmission member to the outer peripheral part of the said coupling.

  According to such a configuration, for example, the rotational force for rotating the joint from the prime mover can be easily transmitted to the joint by the rotational force transmitting member.

  In the pipe material joining method according to the present invention, the joining step can be performed by rotating the joint with a rotary drive shaft having a substantially vertical positional relationship with respect to the joint rotational axis.

  According to such a configuration, the entire length of the welding jig can be reduced because the entire length can be shortened by arranging the rotational drive shaft in a direction perpendicular to the rotational shaft of the joint.

  The piping material joining method according to the present invention shortens the joining time, makes it difficult to suffer from obstacles due to the shape of the piping material, and facilitates the joining operation, so that the piping material can be joined smoothly.

It is a cross-sectional schematic diagram which shows the state which inserted the piping material in the coupling in the piping material joining method which concerns on this invention. It is a schematic diagram which shows the state which rotates the outer peripheral part of the coupling in which piping material was inserted in 1st Embodiment by a rotational force transmission means. (A) It is a schematic diagram which shows the state in the middle of attaching a rotational force transmission means to the outer peripheral part of a joint in 2nd Embodiment, (b) A rotational force transmission means is attached to the outer peripheral part of a joint in 2nd Embodiment. FIG. 6 is a schematic diagram showing a state in which a circumferential rotational force is applied to the outer peripheral portion of the joint. It is a schematic diagram which shows the state which attaches a rotational force transmission means to the outer peripheral part of a joint in 3rd Embodiment, and applies the circumferential direction rotational force to the outer peripheral part of a joint. It is a schematic diagram which shows the state which applies the rotational force of the circumferential direction to the outer peripheral part of a coupling | joint by the rotational drive shaft in a vertical relationship with respect to the rotating shaft of a coupling | joint in 4th Embodiment.

Next, the piping material joining method according to the present invention will be described in detail with reference to the drawings as appropriate.
The pipe material joining method according to the present invention is a state in which a pipe material is inserted into the joint using a thermoplastic resin joint, and the joint and the pipe material are in contact with each other, and the circumferential rotation of the pipe material is restricted. In this state, a rotational force is applied to the outer peripheral portion of the joint to melt it by friction between the joint and the piping material, and then the piping material is joined by heat welding for solidification.

[First Embodiment]
In the invention according to the first embodiment, as shown in FIG. 1, a pipe material made of thermoplastic resin is inserted into a joint made of thermoplastic resin so that the joint and the pipe material are in contact with each other. Next, both circumferential rotations of the inserted piping material are restricted, and as shown in FIG. 2, a rotational force is applied to the joint while supporting three points on the outer periphery of the joint with a cylindrical roller, In this method, the piping material and the joint are joined by heat welding by frictional heat between the piping material and the joint.

[Fitting]
The resin forming the joint used in the present embodiment is mainly formed of a thermoplastic elastic material such as rubber or synthetic resin that can join the piping material by heat welding. The joint is preferably formed of a resin having a melting point that is the same as or close to that of the resin that forms the outer layer of the piping material so that thermal welding can be easily performed. In the present embodiment, for example, the joint is made of the same polyamide resin (PA11, PA12, PA6, PA66, PA610, PA612, PPA, PE, etc.) as the outer layer of the piping material.

  In the present embodiment, as shown in FIG. 1, the joint 1 has a tubular shape through which liquid or the like flows. The groove portion 2 of the joint 1 into which the ends of the piping materials 12 and 13 are inserted is formed by the insertion portion 3, the welded portion 4, and the straight pipe portion 5.

  The straight pipe portion 5 constitutes an intermediate portion of the joint 1 and has an inner diameter equal to or larger than the inner diameter of the piping members 12 and 13 in a normal state. The insertion part 3 is coaxially and integrally formed on both sides of the straight pipe part 5. The welded portion 4 has a cylindrical shape that surrounds the outer periphery of the insertion portion 3 with a gap in the radial direction, and is formed coaxially and integrally on both sides of the straight pipe portion 5 so that the tip portions of the pipe members 12 and 13 are formed. The wall surface of the annular groove part 2 inserted is comprised. The width of the groove portion 2 (interval between the insertion portion 3 and the welding portion 4) is preferably equal to or less than the thickness of the piping materials 12 and 13 so that the piping materials 12 and 13 and the welding portion 4 can easily come into contact with each other. The length in the axial direction of the welded portion 4 (depth of the groove portion 2) preferably extends to the end of the insertion portion 3, and may extend beyond the end of the insertion portion 3. By having a length equal to or longer than the insertion allowance of the piping material into which the welded portion 4 is inserted, it becomes easy to cover burrs that are likely to occur during joining. The thickness of the welded portion 4 is preferably thicker in order to increase rigidity and prevent the welded portion 4 from spreading during bonding. The thickness of the welded portion 4 may be equal to or greater than the thickness of the piping material to be inserted.

As shown in FIG. 1, when the insertion portion 3 of the joint 1 is inserted into the piping materials 12 and 13 to be joined, the welding portion 4 contacts the surface of the outer layer at the ends of the piping materials 12 and 13. Cover with condition.
The outer peripheral surface of the insertion part 3 may be provided with a protrusion that is formed in a taper shape that increases in diameter from the insertion part 3 side toward the straight pipe part 5 side and protrudes in the radial direction. Providing the protrusions makes it difficult for the pipe members 12 and 13 to come out of the joint 1. Moreover, the contact area between the joint 1 and the piping materials 12 and 13 is also likely to increase. By forming the protrusions in a tapered shape, the piping materials 12 and 13 can be easily inserted into the joint 1.

[Piping material]
The piping materials 12 and 13 to be joined are mainly formed of a thermoplastic elastic material such as rubber or synthetic resin that can be joined by thermal welding. The piping materials 12 and 13 to be joined are formed of a resin whose melting point is the same as or close to that of the resin forming the joint 1 so that the outer layers of the piping materials 12 and 13 can be easily welded to the joint 1. It is preferred that Since rotation becomes easy and the contact area with the joint 1 increases, the piping members 12 and 13 to be joined preferably have a circular cross-sectional shape. Examples of the piping members 12 and 13 to be joined in the present embodiment include a fuel tube for circulating fuel from a fuel tank to an engine in an automobile.

For example, as shown in FIG. 1, the pipe members 12 and 13 to be joined in the present embodiment are provided between a pipe member 12 having a two-layer structure having different materials on the inner peripheral side and the outer peripheral side, and between the inner peripheral side and the outer peripheral side. The pipe material 13 has a three-layer structure, each having an intermediate layer. The piping material 12 having a two-layer structure is composed of a polyamide-based resin (PA11, PA12, PA6, PA66, PA610, PA612, PPA, PE, etc.), which is a material having an excellent outer layer with excellent fuel permeation resistance and high hardness. The inner layer is made of a conductive fluororesin (such as ETFE which is a copolymer containing ethylene and tetrafluoroethylene). On the other hand, the pipe material 13 having a three-layer structure has an outer peripheral layer made of a polyamide resin, an intermediate layer made of a polyolefin resin (such as an ethylene vinyl alcohol copolymer), and an inner layer made of a conductive polyamide resin.
In addition, the piping materials 12 and 13 to be joined may have a reinforcing material incorporated therein, and there is no limit on the number of layers and the number of layers. The piping material 1 to be joined may contain a filler and a conductive filler.

[Rotating device]
The rotating device is a means for applying a rotational force for rotating the joint 1 into which the pipe members 12 and 13 are inserted in the circumferential direction.
The rotating device in the present embodiment is a roller device (three-point roller) 31 that uniformly supports the joint 1 including three cylindrical resin rollers having no protrusions as shown in FIG. . The roller device 31 forms a hollow shaft and rotates only the joint 1 among the joints 1 into which the pipe members 12 and 13 are inserted. Each roller constituting the roller device 31 can change the position of the rotary shaft in a direction in which the joint 1 into which the pipe members 12 and 13 are inserted is opened so that the joint device 1 can be taken into the roller device 31, for example. The driving roller 32 is connected to a driving shaft such as a driving roller 32 that applies a rotational force in the circumferential direction to the joint 1, and the supporting roller 33 is fixed at a rotational position and does not apply a rotational force in the circumferential direction to the joint 1. The drive roller 32 can change the position of the rotating shaft, and the joint 1 into which the pipe members 12 and 13 are inserted can be arranged on the hollow shaft formed by the roller device 31. The drive roller 32 rotates only the joint 1 among the joints 1 into which the pipe members 12 and 13 are inserted by the frictional force between the outer peripheral surface of the drive roller 32 and the outer peripheral surface of the joint 1.

<Joint process>
The piping material joining method according to the present embodiment uses a joint mainly formed of a thermoplastic elastic material such as rubber or synthetic resin that can be joined by thermal welding. As shown in FIG. 2, in the joining step, the first piping material and the second piping material to be joined are inserted into the groove portion of the joint, and the first piping material and the second piping material are inserted by an appropriate jig (not shown). In a state where the rotation of the pipe material in the circumferential direction is restricted, the rotating device applies a rotational force in the circumferential direction to the outer peripheral portion of the joint and rotates it to generate frictional heat. Thereby, the contact part with the outer layer of the 1st piping material, the outer layer of the 2nd piping material, and the inner peripheral surface of the welding part which forms a groove part fuse | melts and adheres by friction heat.

  Specifically, in this embodiment, first, the piping material 12 and the piping material 13 to be joined are respectively inserted into the groove portions 2 at both ends of the joint 1. Specifically, as shown in FIG. 1, the pipe members 12 and 13 are inserted into the insertion portion 3 that forms the groove portion 2 at the end of the joint 1, and subsequently inserted to the straight pipe portion 5 side. Thereby, the surface of the inner layer of the piping materials 12 and 13 is in contact with the outer peripheral surface of the insertion portion 3, the outer layer of the tip portion of the piping materials 12 and 13 is in contact with the entire inner peripheral surface of the welded portion 4, and the piping materials 12, It is assumed that the tip end portion of 13 is in contact with the back of the groove portion 2. In other words, all the parts to be joined by welding are made of the same polyamide resin and are in contact with each other.

  Next, it hold | maintains with a suitable jig | tool so that rotation of the piping materials 12 and 13 which are joining objects may be controlled. The piping materials 12 and 13 may be held as long as the rotation of the piping materials 12 and 13 can be restricted when the joint 1 is rotated. For example, the piping materials 12 and 13 are clamped by an elastic material and fixed by a rubber clip. Can be mentioned. The holding of the piping materials 12 and 13 is not limited to this method, and any method can be adopted.

  Then, as shown in FIG. 2, the roller device forms the joint 1 into which the piping members 12 and 13 are inserted by moving the position of the rotation shaft of the drive roller 32 connected to the drive shaft of the prime mover (not shown). It arrange | positions on the said hollow shaft. By applying a predetermined pressure to the joint 1 by the drive roller 32, the joint 1 is rotated around the hollow shaft with the drive roller 32 interposed by the rotational driving force of the prime mover while shifting the hollow shaft of the joint 1 in parallel. Since the joint 1 rotates in a state in which the hollow shaft of the joint 1 and the central axes of the piping materials 12 and 13 are displaced, the inner peripheral surface of the welded portion 4 of the joint 1 and the outer peripheral surfaces of the piping materials 12 and 13 are partially At a predetermined contact pressure, and frictional heat is generated between the inner peripheral surface of the welded portion 4 of the groove portion 2 and the outer peripheral surfaces of the piping members 12 and 13. The frictional heat softens the inner peripheral surface of the welded portion 4 of the groove portion 2 and the outer peripheral surfaces of the piping materials 12 and 13, melts them, and then cools them to weld the piping materials 12 and 13 and the joint 1. .

  That is, according to this method, since the rotation of the pipe members 12 and 13 is restricted and only the joint 1 is rotated, the rotation of the joint 1 is stabilized regardless of the shape and state of the pipe members 12 and 13, and the friction is reduced. Heat is generated evenly. In addition, the contact pressure between the inner peripheral surface of the welded portion 4 of the joint 1 and the outer peripheral surfaces of the pipe members 12 and 13 is stable, and frictional heat is generated evenly. Therefore, the outer peripheral surface of the piping materials 12 and 13 and the inner peripheral surface of the welded portion 4 can be uniformly melted regardless of the shape and state of the piping materials 12 and 13. Moreover, since it is possible to rotate only the joint 1 and to make the joint 1 and the piping materials 12 and 13 into a molten state at a time, the number of work processes can be reduced as compared with the prior art.

  Since the roller device used in this embodiment supports the joint 1 into which the pipe members 12 and 13 are inserted evenly at three points, the rotation of the joint 1 is stabilized, and the outer peripheral surface of the pipe members 12 and 13 and the joint 1. It becomes possible to melt the inner peripheral surface of the welded portion 4 and to join them uniformly. Therefore, the joint strength between the piping materials 12 and 13 and the joint 1 is expected to be improved.

According to the above, the following effects can be obtained in the bonding method according to the present embodiment.
In this embodiment, it is possible to join the piping material and the joint without using a sealing material such as an O-ring by rotating frictional joining (spin joining) between the piping material and the joint. It becomes possible to simplify. Unlike the connection in which the piping material is simply inserted into the joint, since the piping material and the joint are welded, rotation around the joint of the jointed piping material is suppressed and the piping material is difficult to come off.

  Furthermore, since the piping material is welded simultaneously by rotating only the joint in the circumferential direction in a state where the piping material is inserted at both ends of the joint, the number of work steps can be reduced as compared with the prior art. Further, the manufacturing process can be reduced by one as compared with the case of rotating the piping material, and the manufacturing cost can be reduced. Since the rotation of the piping material is restricted and only the joint is rotated, it is possible to easily join even a piping material that is not a straight tube in which the piping material is subjected to processing such as bending. Since the piping material does not rotate, the restriction of the processing order of the piping material is reduced, and the degree of freedom in the manufacturing process of the product using the joined piping material is improved.

[Modification]
Hereinafter, the pipe material connection method according to the second to fourth embodiments will be described. In addition, the same code | symbol is attached | subjected to the element same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

[Second Embodiment]
As shown in FIG. 3A, the second embodiment uses a hollow gear-type rotational force transmission member 21 to rotate the joint 1 and changes the cross-sectional shape of the joint 1 to a hexagonal shape to transmit rotational force. The member 21 holds the joint 1. Then, as shown in FIG. 3B, the drive gear 36 provided on the drive shaft connecting the rotational force transmitting member 21 to the prime mover or the like meshes with the rotational force transmitting member 21 to transmit the driving force, thereby coupling the joint. The difference is that 1 is rotated in the circumferential direction.

[Rotational force transmission member]
The rotational force transmitting member 21 includes a first semi-cylindrical body and a second semi-cylindrical body connected by a hinge (not shown), and the first semi-cylindrical body and the second semi-cylindrical body are hinged. When closed as a shaft, a hollow cylindrical body is formed which houses and holds the joint 1 therein. The cross-sectional shape of the rotational force transmitting member 21 that accommodates the joint 1 is hexagonal, and the internal shape is selected so that the joint 1 having a hexagonal shape corresponding to the cross-sectional shape of the rotational force transmitting member 21 in a cross-sectional view is fitted. . The rotational force transmitting member 21 is fitted and engaged with the outer peripheral surface of the joint 1 on the inner peripheral surface, and the inner peripheral surface and the outer peripheral surface of the joint 1 are frictionally engaged to hold the joint 1. The first semi-cylindrical body and the second semi-cylindrical body forming the cylindrical body do not rotate around the axis center with respect to the joint 1 and do not move in the axial direction. 1 may have a joint fixing portion that is fitted to the outer peripheral surface of 1 and fixes the joint 1. Locking means may be provided on the rotational force transmitting member 21 in order to maintain the first semi-cylindrical body and the second semi-cylindrical body in a closed state.

And the rotational force transmission member 21 has a first semi-cylindrical body and a second semi-cylindrical body with protrusions meshing with a driving gear 36 provided on a driving shaft of a prime mover (not shown) on the outer peripheral surface in a state where a cylindrical body is formed. It is provided on the outer peripheral surface of the semi-cylindrical body. The rotational force transmission member 21 in a state where the cylindrical body is formed is a hollow gear in which the protrusions are regularly arranged on the peripheral surface in parallel with the axial direction of the joint 1.
The rotational force transmission member 21 is preferably made of metal in consideration of durability, but may be made of resin that can be reduced in weight.

  By using the hollow gear type rotational force transmission member 21 that can be divided into two, the rotational force transmission member 21 can be attached to the joint 1 from the outer peripheral surface side without passing through the end of the piping material. For this reason, even after the pipe material is subjected to processing such as bending, the pipe material can be easily joined. Moreover, since the rotational force transmission member 21 can be divided, it is easy to remove the rotational force transmission member 21 after joining the piping members.

[Mounting of rotational force transmission member]
Since the rotational force transmitting member 21 used in the present embodiment can be divided, it can be attached before the piping members 12 and 13 are inserted into the joint 1 or after the piping members 12 and 13 are inserted into the joint 1. It is. However, in consideration of ease of attachment, it is preferable that the piping members 12 and 13 are inserted into the joint 1.

  By using the rotational force transmitting member, the driving force from the prime mover can be transmitted more than when only the roller is used, and the joint 1 can be rotated strongly and quickly. Therefore, it is possible to shorten the joining time, and the joining strength is improved as compared with the case where only the roller is used.

[Third Embodiment]
As shown in FIG. 4, the third embodiment is different in that the rotation device of the second embodiment is changed to a gear device (three-point gear) 37. The gear device 37 in the present embodiment corresponds to, for example, the roller of the first embodiment changed to a gear, can change the position of the rotation shaft, and is connected to a prime mover or the like to give a circumferential rotational force to the joint. It comprises a drive gear 36 and support gears 39, 39 whose rotational positions are fixed and which do not apply a circumferential rotational force to the joint 1. Other structures and functions of the gear device 37 are the same as those of the roller device of the first embodiment.

Since the rotating device is the gear device 37 that supports the joint 1 at three points, the support position of the joint 1 is increased, and the rotation of the joint 1 is more stable than in the second embodiment. For this reason, the outer layers of the piping materials 12 and 13 and the inner peripheral surface of the welded portion 4 can be melted more uniformly, and can be allowed to cool more uniformly, so that more uniform joining is possible. It becomes. Therefore, the joint strength between the piping materials 12 and 13 and the joint 1 is further improved.
Further, by having the drive gear 36 capable of changing the position of the rotating shaft, the joint 1 into which the piping members 12 and 13 are inserted can be arranged on the hollow shaft formed by the gear device 37. For this reason, the pipe members 12 and 13 can be joined by the gear device 37 even after the pipe members 12 and 13 are processed such as bending.
Furthermore, by using the rotational force transmitting member 21, the driving force from the prime mover can be transmitted more than using only the roller.

[Fourth Embodiment]
In the fourth embodiment, as shown in FIG. 5, the rotational force transmission member 22 and a gear 42 provided on a drive shaft 43 connected to a prime mover (not shown) are formed in a so-called bevel gear shape and are connected to the prime mover. The point which made the drive shaft 43 and the rotating shaft of the coupling 1 substantially orthogonal differs from the second embodiment.

  By making the drive shaft 43 connected to the prime mover and the rotation axis of the joint 1 orthogonal, the pressure applied to the joint 1 can be adjusted by the axial position of the gear 42 provided on the drive shaft 43 connected to the prime mover or the like. Become. For this reason, it is easier to adjust the pressure applied to the joint 1 than when the drive shaft 43 connected to the prime mover or the like and the joint 1 are in a substantially parallel positional relationship. In addition, since the location of the rotating device can be easily separated from the joint 1 and the piping material, even after processing that involves significant deformation such as bending the piping material by 90 °, it is affected by the shape of the piping material. It is difficult to perform the joining work.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to above-described embodiment. For example, the following modifications can be made as appropriate without departing from the spirit of the invention.

The shape of the joint is not limited to the above-described shape, and can be changed as long as the rotation of the piping material inserted into the joint is restricted and the joint can be rotated in the circumferential direction. For example, the joint may have a shape including a straight pipe portion and an insertion portion. Further, the joint may have a shape that is extrapolated to the piping material.
That is, the welded joint between the joint and the piping material is limited to the inner peripheral surface of the welded portion of the joint and the outer layer of the pipe material as long as the circumferential rotation of the pipe material is restricted and the joint can be rotated in the circumferential direction. It is also possible to use the outer peripheral surface of the joint insertion portion and the inner layer of the piping material.

  A joint may be integrally formed at the end of the first piping material, the second piping material may be inserted into the joint portion, and the joint portion may be rotated to join. For example, an insertion portion to be inserted into the second piping material is formed at the end of the first piping material, and a welding portion is formed. Next, a 2nd piping material is inserted in the insertion part of a 1st piping material, and it is set as the state where the welding part contacted the outer layer of the edge part of a 2nd piping material, and was covered. And the joint part of the 1st piping material may be rotated with a rotating device, and the welding part of the 1st piping material and the outer layer of the edge part of the 2nd piping material may be welded and joined. In this case, it is preferable that the inner peripheral side of the first piping material and the outer layer of the second piping material are made of the same melting point.

  Also, the end of the first piping material is expanded so that the end of the second piping material can be inserted, and the end of the second piping material is inserted into the end of the expanded first piping material. The inner peripheral surface of the first piping material and the outer layer of the second piping material are in contact with each other. In this state, the outer peripheral surface of the first piping material at the overlapping portion of the first piping material and the second piping material is rotated by the rotating device, and the inner peripheral surface of the end portion of the first piping material and the second You may weld and join the outer layer of the edge part of this piping material.

The rotating device is not limited to the above-described device, and may be a device provided with one drive roller or a device provided with a plurality of drive rollers.
The rotational force transmission member does not need to have a structure that can be divided, and may be a hollow gear that can be inserted into the joint through the piping material from one end of the piping material. The shape of the joint holding portion of the rotational force transmitting member is not limited to the hexagonal shape as long as it can be fitted to the outer periphery of the joint.
Of the outer peripheral portion of the joint, gear-shaped protrusions may be provided at least at a straight pipe portion at equal intervals in parallel with the shaft, and the joint may be rotated by meshing with the gear of the rotating device.

  As long as the joint is rotated and the joint and the piping material are melted by friction and can be joined to the piping material, the shape, size, material, etc. of the joint are not limited. In addition, as long as the joint can be rotated and joined, the shape, outer diameter, inner diameter, material, and the like of the piping material to be joined are not limited. For example, the present invention can be applied to a piping material for a brake device that has been subjected to bending.

Examples in which the effects of the present invention have been confirmed will be specifically described below in comparison with comparative examples that do not satisfy the requirements of the present invention.
Note that the present invention is not limited by the following examples, and of course, the present invention can be implemented with appropriate modifications within a range that can be adapted to the gist of the following description. Included in the technical scope.

(Example)
A joint A composed of a PA 12 having groove portions was prepared by forming insertion portions on both sides of the straight pipe portion and forming weld portions at intervals in the radial direction on the outer periphery of the insertion portion. Further, as a pipe material to be joined, a pipe material B having a two-layer structure in which the outer peripheral surface is made of conductive ETFE and the inner layer is made of PA12, and the outer peripheral surface is made of conductive PA12, the inner layer is made of PA12, and the intermediate layer is made of EVOH. A three-layered piping material C was prepared.

A motor (brushless motor, servo motor) was prepared as a rotating device.
A rotational force transmission member D having a cylindrical shape with an outer diameter of 12 mm, an internal shape corresponding to the shape of the outer peripheral surface of the straight pipe portion of the joint A, and a hexagonal shape with a side length of 7 mm was prepared. .

Next, the piping material B and the piping material C are inserted into the insertion portions at both ends of the joint A, and these are inserted up to the wall surface at the back of the groove, so that the welded portion of the joint A is the outer peripheral surface of the piping material B and the piping material C. It was made into the state which touched and covered.
Then, the rotational force transmission member D was attached to the outer peripheral surface of the straight pipe part of the joint A.

  Then, the piping material B and the piping material C are inserted into the joint A, the rotational force transmitting member D is attached to the outer peripheral surface of the straight pipe portion of the joint A, and the rotation of the piping material B and the piping material C is restricted by a rubber clip. In this state, the joint A was rotated at a rotational speed of 1000 rpm for 5 seconds by a rotating device.

  The pipe material joined by the above procedure is set as the test body 1.

The joint material is PPA, the first piping material is a two-layer structure in which the outer layer is made of HDPE and the inner layer is made of PPA, and the second piping material is made of a single-layer structure made of PPA and joined in the same manner as the specimen 1. The piping material is designated as test body 2.
The joint material is HDPE, the first piping material is HDPE as the outer layer, the middle layer is EVOH, the inner layer is a three-layer structure consisting of HDPE, and the second piping material is a single-layer structure consisting of HDPE. The piping material joined in the same manner as the body 1 is defined as a test body 3.

(result)
The joined test bodies 1 to 3 were in a good joined state similar to the joining by the conventional method.

  From this, this invention can join a piping material in a shorter time than the conventional method.

DESCRIPTION OF SYMBOLS 1 Joint 2 Groove part 3 Insertion part 4 Welding part 5 Straight pipe part 12 Piping material 13 Piping material 21 Rotational force transmission member 22 Rotational force transmission member 31 Roller device 32 Drive roller 33 Support roller 36 Drive gear 37 Gear device

Claims (3)

A method of joining a first piping material and a second piping material using a joint,
The joint is a tube formed of a thermoplastic elastic material, and a straight pipe part constituting an intermediate part of the joint and the first pipe formed coaxially and integrally on both sides of the straight pipe part. A piping member and an insertion portion inserted into the second piping material; and the first piping material and the second pipe in a state where the first piping material and the second piping material are inserted into the insertion portion. A groove portion formed by a coaxially and integrally formed welded portion on both sides of the straight pipe portion covering the surface of the end portion of the piping material,
The end of the first piping material and the end of the second piping material are respectively inserted into the grooves of both ends of the joint, and the circumferential direction of the first piping material and the second piping material A piping material joining method, comprising: a joining step of applying a circumferential rotational force to the outer peripheral portion of the joint in a state where rotation is restricted.   The method for joining piping materials according to claim 1, wherein the joining step is performed by attaching a rotational force transmitting member to an outer peripheral portion of the joint. The pipe material joining method according to claim 2, wherein the joining step is performed by rotating the joint with a rotational drive shaft that is in a substantially vertical positional relationship with the rotational axis of the joint.

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