JPH1061826A - Method and device for manufacturing weld pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and rapidly manufacture at a site a weld pipe to increase a joining strength through integral formation by welding and besides have excellent waterproof performance. SOLUTION: The end part 3a of one pipe member 3 made of a resin is positioned facing the one side of the opening part 4 of a socket 2 made of a resin. The end part 3a of the other pipe member 3 made of a resin is positioned facing the other side of the opening part 4 of the socket 2. The socket 2 is rotated around its axis and the end parts 3a of the pipe members 3 are respectively pressed in from both sides of the opening part 4 of the rotating socket 2 in a state to block rotation of the pipe member 3. By melting the resin by a friction heat between the socket 2 and the pipe member 3, the socket 2 and the pipe member 3 are welded to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a welded pipe, and more particularly, to a novel welded pipe in which a resin pipe member and a socket are integrated by utilizing the melting of the resin. It is about technology.

[0002]

2. Description of the Related Art For example, long pipes for water supply and sewerage are
It is manufactured by connecting a plurality of short pipe members via a socket.However, if long pipes are transported from a factory to the site, the transport work becomes large, so the work of connecting the pipe members at the site is required. It is common to do. As a conventional pipe connection method, an adhesive is applied to the tips of two pipe members to be connected, and the tips of the pipe members to which the adhesive is applied are screwed in from both sides of the opening of the socket. A method of bonding the two is known.

[0003]

However, in the conventional method of connecting pipes with an adhesive, not only is the connection strength between the pipe members insufficient, but it is necessary to wait for the adhesive to harden after the connection. Therefore, there is a problem that the working time is lengthened, and furthermore, there is a problem that the waterproofness of the bonded portion is reduced due to a variation in application of the adhesive, and water leaks easily from a connecting portion between the pipe member and the socket. There was also.

[0004] The present invention has been made in view of the above points, and is a welded pipe that has high joining strength due to integration by welding, has excellent waterproof performance, and can be manufactured easily and in a short time even on site. It is an object of the present invention to provide a manufacturing method and an apparatus therefor.

[0005]

In order to solve the above-mentioned problems, a method for manufacturing a welded pipe according to the present invention comprises a method of manufacturing an end of one resin-made pipe member 3 at one side of an opening 4 of a socket 2 made of resin. With the end 3a of the resin-made pipe member 3 facing the other side of the opening 4 of the socket 2, the socket 2 is rotated around its axis, and the rotation of each pipe member 3 is performed. Of the pipe member 3 is pressed from both sides of the opening 4 of the rotating socket 2, and the socket 2 and the pipe are melted by frictional heat between the socket 2 and the pipe member 3. The member 3 is welded to each other, and by adopting such a manufacturing method, it is possible to completely prevent a gap from being generated in a joint portion between the pipe member 3 and the socket 2, and the joining strength is strong. And prevention Welded pipe 1 is obtained with excellent performance.

The apparatus for manufacturing a welded pipe according to the present invention comprises a socket holding device 1 for holding a resin socket 2.
0, the socket 2 gripped by the socket gripping device 10
Rotating means 11 for rotating the pipe member 3 about its axis, and end portions 3a of two resin pipe members 3 which are movably disposed on both sides of the socket gripping device 10 on both sides of the opening 4 of the socket 2, respectively. A pair of pipe fixing devices 12 for fixing each pipe member 3 in a state where the pipe members 3 are opposed to each other, and each of the pipe fixing devices 12 is moved to the socket 2 side, and from both sides of the opening 4 of the socket 2 rotated by the rotating means 11. The end portions 3a of the respective pipe members 3 whose rotation has been prevented by the pipe fixing device 12 are respectively press-fitted, and the socket 2 and the pipe members 3 are welded to each other by melting of the resin due to frictional heat between the socket 2 and the pipe members 3. And a press-fitting device 13 for causing the press-fitting device 13 to rotate the socket 2 by the rotating means 11 and thereby to form a pipe. The end 3a of the pipe member 3 whose rotation is prevented by moving the setting device 12 can be pushed into both sides of the opening 4 of the rotating socket 2, so that the friction heat between the socket 2 and the pipe member 3 can be increased. As a result, the melting of the resin proceeds smoothly, and the socket 2 and the pipe member 3 can be easily welded.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of an embodiment of the present invention will be described. As shown in FIG. 4, the welded pipe 1 of this embodiment includes a resin socket 2 and two resin pipe members 3 connected via the socket 2. FIG. 4 shows a state before welding.

[0008] The socket 2 is made of, for example, a straight tubular polyethylene resin. A flange 5 is provided at the center of the opening 4 of the socket 2 so as to protrude inward.
The ends 3a of the two pipe members 3 are respectively press-fitted into the opening portions 4a on both sides thereof.
The opening portion 4a of the socket 2 into which the end portion 3a of the pipe member 3 is press-fitted is formed in a right cylindrical shape. In addition to this shape, for example, as shown in FIG. A tapered surface 6 (inclination of about 1 ° with respect to the axis M of the socket 2) is formed so as to be slightly larger on the entrance side, and a tapered surface 7 with a large inclination is formed on the entrance 4b side of the opening 4a. Preferably, it is formed so that the end 3a of the pipe member 3 is easily pressed into the opening 4a. Here, the inner diameter a of the entrance 4b of the opening 4a is, for example, φ27 mm, the maximum inner diameter b of the tapered surface 7 is, for example, φ29 mm, and the tapered surface 7
Is 2 mm, for example, and the outer diameter c of the socket 2 is, for example, φ
The inner diameter e of the flange 5 is set to, for example, φ20 mm.

On the other hand, the two resin pipe members 3 are made of the same polyethylene resin as the socket 2, and are integrated with the socket 2 by utilizing the melting of the resin due to frictional heat described later. Here, the end 3a of the pipe member 3
It is preferable to form a cut portion 8 on substantially the entire circumference in the circumferential direction, for example, as shown in FIG. This cut portion 8 creates a space 9 between the cut portion 8 and the inner surface of the socket 2 when the end 3 a of the pipe member 3 abuts against the flange portion 5 of the socket 2, and is melted in the space 9. It works to release resin. The inner diameter f of the pipe member 3 is, for example, φ20 mm, and the outer diameter g of the pipe member 3 is, for example, φ2.
The depth h and the width i of the cut portion 8 are set to about 3 mm, respectively.

Next, a manufacturing apparatus 30 for manufacturing the welding pipe 1 will be described. As shown in FIG. 1, the manufacturing apparatus 30 includes a socket gripping device 10, a rotating unit 11 for rotating the socket 2, a pair of pipe fixing devices 12 for fixing the pipe member 3, and a socket fixing device 12. There is provided a pair of press-fitting devices 13 which are moved toward the gripping device 10 and press-fit the end 3a of the pipe member 3 into the opening 4 of the socket 2.

First, the socket gripping device 10 includes a collar 14 fitted on the outer peripheral surface of the socket 2 and a driving roller 15a for rotatably supporting the collar 14 around its axis.
Free rollers 15b and these rollers 15a, 15
roller cover 16 that supports b, and roller cover 1
6 and a fixed base 17 for supporting the same. The collar 14 is made of, for example, brass (brass). As shown in FIG. 6, a part 14a of the collar 14 in the circumferential direction is cut so that the collar 14 can be fitted on the outer peripheral surface of the socket 2.
The thickness of the collar 14 is set to, for example, 2 mm, and the inner diameter is set to be equal to or slightly larger (for example, about 1 mm) than the outer diameter of the socket 2.

[0012] The cylindrical roller cover 16 is shown in FIG.
As shown in FIG. 3 and FIG. 3, the roller cover member 16a is divided into a pair of half-split roller cover members 16a and 16b, and the lower roller cover member 16b is fixed on a fixed base 17 and the upper roller cover member 16b. 16a is rotatably connected to one end of the upper roller cover member 16a via a hinge portion 18. Each roller cover material 16a, 1
At the other end opposite to the one where the hinge 18 of 6b is provided, there is provided an attachment 19 for attaching a lock means for locking the roller cover members 16a and 16b in a closed state.

Here, inside the lower roller cover member 16b, one drive roller 15a and two free rollers 15b are arranged side by side at equal intervals in the circumferential direction of the roller cover member 16b. Each roller 15a, 15b
Are arranged along the axial direction of the socket 2 and in parallel with each other, and the shaft portions of the rollers 15a and 15b are rotatably supported by a plurality of bearing portions provided on both side plates 16c of the roller cover member 16b. . Here, the driving roller 15a
Is connected to one side plate 1 of the roller cover material 16b.
6c protrudes outside through the opening 20 cut out,
For example, it is connected and fixed to the output shaft of the motor 21 at 1000 to 1200 rpm, and the drive roller 15 a is driven to rotate by the motor 21. That is, the motor 21 constitutes a rotating means 11 for rotating the socket 2 gripped by the socket gripping device 10 around its axis, and the motor power is turned on by a switch (not shown).
Turned off. Note that the inner peripheral edges 16d of the both side plates 16c of the roller cover members 16a, 16b are
b is located at a position more distant from the collar 14 than the inner end surface on the side of the collar 14.

The upper roller cover member 16a is
All three rollers 15b are free rollers,
The drive roller 15a and the opening 20 are not provided.
Other configurations have the same structure as the lower roller cover member 16b, and corresponding portions are denoted by the same reference numerals. On the other hand, the pipe fixing device 12 includes two pipe members 3
FIG.
As shown in FIG. 1, a pair of half-splitting chuck pieces 22a and 22b are mounted on a movable base 27 via a support 26. One end of each of the chuck pieces 22a and 22b is rotatably connected via a hinge portion 23, and an attachment portion 24 for attaching a lock means for locking the chuck pieces 22a and 22b in a closed state is provided. I have. Further, the inner surfaces of the chuck pieces 22a and 22b are curved with the same curvature as the outer diameter of the pipe member 3, and the inner surfaces are formed with uneven grooves 25 for preventing slip.
The anti-slip concave / convex groove 25 is formed in parallel with the longitudinal direction (the traveling direction) of the pipe member 3 so that the pipe member 3 can be prevented from rotating around its axis.

As shown in FIG. 10, a concave groove 34 into which a stopper 33 is removably inserted is formed on the lower surface of the movable base 27 of the pipe fixing device 12. The concave groove 34 is formed in a substantially L-shape when viewed from below, and its bending direction extends in a direction orthogonal to the moving directions A and B of the movable table 27, and the stopper 33 is inserted into the concave groove 34. Thus, the movable table 27 can be temporarily fixed by the stopper 33.

A press-fitting device 13 is provided between the socket holding device 10 and each pipe fixing device 12. Each press-fitting device 13 is for moving each pipe fixing device 12 in the direction indicated by the arrow A in FIG. 1 to press-fit the end 3 a of the pipe member 3 toward both sides of the opening 4 of the socket 2. In this embodiment, one long guide shaft 28 is inserted into a bush 31 that penetrates the fixed base 18 of the socket holding device 10, and both ends of the guide shaft 28 are movable bases of the pipe fixing device 12. The guide shaft 28 is provided with legs 29 at both ends thereof. A spring 32 composed of a compression coil spring is fitted into a portion of the guide shaft 28 between the fixed base 18 and the movable base 27, and one end of each spring 32 is attached to the fixed base 17 and the other end. The movable table 27 is constantly urged toward the fixed table 17 side (inside B) by the spring force of the spring 32.

Next, the operation will be described. A plurality of pipe members 3 and sockets 2 manufactured in a factory are transported together with the manufacturing apparatus 30 to the site, and the welded pipe 1 is manufactured using the manufacturing apparatus 30 at the site. That is, the roller covers 16a, 16b of the socket gripping device 10 are opened, and the collar 14 in which the socket 2 has been inserted in advance is moved to the roller covers 16a, 16b.
(FIG. 2). On the other hand, the chuck piece 22
a, 22b are opened, and the pipe member 3 is attached to the chuck pieces 22a,
22b, and manually pulls the pipe fixing device 12 toward the outside A to a predetermined position, and inserts the stopper 3 into the groove 34 provided in the movable base 27 of the pipe fixing device 12.
3 and stop the pipe fixing device 12 at a predetermined position (the state of FIG. 1). Then, as shown in FIG. 5A, when the stopper 33 is removed in a state where the chuck pieces 22 a and 22 b are closed and the pipe member 3 is fixed, the pipe fixing device 12 is pulled inward B by the force of the spring 32, The ends 3a of the pipe members 3 are strongly pressed against the inlets 4b of the openings 4 of the socket 2, respectively.

Thereafter, when the power of the motor 21 is turned on, the driving roller 15a connected to the shaft of the motor 21 starts to rotate, and the driving roller 15a and the free roller 15b respectively move the collar 14 and the socket 2 fitted in the collar 14 respectively. Start spinning. At this time, the rotation of the pipe member 3 is prevented by the chuck pieces 22a and 22b, and the pipe member 3 is being rotated by the spring 32 in the axial direction toward the opening 4 of the socket 2 by the force of the spring 32. The end 3a of the pipe member 3 is pushed into the socket 2,
Friction heat generated by the friction between the socket 2 and the pipe member 3 causes the resin at the contact portion between the socket 2 and the pipe member 3 to melt, and fitting of the pipe member 3 and welding of the pipe member 3 and the socket 2 start. Is done. The polyethylene constituting the socket 2 and the pipe member 3 is melted at a little over 200 ° C., and as shown in FIG. 9, a resin welded portion C is formed at the pressure contact portion between the outer surface of the end 3 a of the pipe member 3 and the inner surface of the socket 2. It is formed. Finally, when the pipe member 3 is press-fitted to a predetermined depth, the motor power is turned off and the rotation of the socket 2 stops.
After that, the roller cover material 16 of the socket holding device 10
And opening the chuck pieces 22a and 22b of the pipe fixing device 12 and removing the collar 14 from the socket 2 to obtain a long welded pipe 1 in which the two pipe members 3 and the socket 2 are integrated. Can be.

Such a straight tubular resin pipe member 3
The welding pipe 1 manufactured by the spin welding method of
Since the two pipe members 3 and the socket 2 are integrated by welding, the connection strength between the pipe member 3 and the socket 2 is higher than in the case of connecting with a conventional adhesive, and the connection portion Since a gap can be completely prevented from occurring, there is no need to worry about water leakage, and the waterproof performance is excellent. Further, since there is no need to vary the application of the adhesive and to wait for the adhesive to harden after bonding as in the related art, it is possible to produce the adhesive easily and in a short time on site. Further, the water resistance of the welded pipe 1 of the present invention was found to be 10 to 13 kg / cm ² according to experiments, and it was found to be optimal for use as the pipe member 3 for water supply and sewerage. The welded pipe 1 can be used widely as a pipe member 3 other than the pipe member 3 for water supply and sewerage.

In this embodiment, the metal collar 14 is used.
The hollow resin socket 2 is attached to the outer surface of the socket 2 by rotating the collar 14.
And can prevent deformation of the socket 2 and the like.
Since the collar 14 can be reused after being removed from the socket 2, waste of members can be eliminated. Further, the opening 4 of the socket 2 is formed as a tapered surface 6 gently expanding from the back side to the inlet 4b side as shown in FIG.
This has the advantage that the end 3a can be smoothly pushed in and the resin melting can proceed smoothly.

Further, a non-slip uneven groove 25 provided on the inner surfaces of the chuck pieces 22a and 22b of the pipe fixing device 12.
As a result, the rotation of the pipe member 3 is reliably prevented,
The rotation of the pipe member 3 together with the socket 2 can be reliably prevented, and sufficient frictional heat can be generated. Further, by providing the cut portion 8 on the outer periphery of the end portion 3a of the pipe member 3, when the end portion 3a of the pipe member 3 comes into contact with the center flange portion 5 of the opening 4 of the socket 2, the cut portion 8 is formed. A space 9 is formed between the inner surface of the socket 2 and the melted resin can be released into the space 9, so that the melted resin can be prevented from entering the pipe member 3, and the joining can be performed. There is also an advantage that accuracy can be increased.

Although the manufacturing apparatus 30 is used on site in the above embodiment, it goes without saying that the welding pipe 1 may be manufactured at a factory. In addition, although polyethylene is illustrated as a material of the socket 2 and the pipe member 3, a resin material other than polyethylene may be used, and the socket 2 and the pipe member 3 may be made of different materials. is there.

[0023]

As described above, in the method for manufacturing a welded pipe according to the first aspect of the present invention, one end of one resin pipe member is opposed to one side of the opening of the resin socket, The other end of the pipe member made of resin is opposed to the other side of the opening of the socket, and the socket is rotated around its axis, and the end of each pipe member is rotated in a state where the rotation of each pipe member is prevented. Since the socket and the pipe member are welded to each other by press-fitting from both sides of the opening of the rotating socket, and the resin is melted by frictional heat between the socket and the pipe member, they are connected by a conventional adhesive. In this case, it is possible to completely prevent a gap from being formed at the joint between the pipe member and the socket. There is no need to wait until the bonding strength is strong, and can be produced excellent weld pipe easily and in a short time to waterproof.

According to a second aspect of the present invention, there is provided an apparatus for manufacturing a welded pipe, comprising: a socket gripper for gripping a resin socket; and a rotating means for rotating the socket gripped by the socket gripper about its axis. A pair of pipe fixing devices movably disposed on both sides of the socket holding device, and fixing each pipe member in a state where ends of two resin pipe members are opposed to both sides of the opening of the socket, respectively. When,
Each pipe fixing device is moved to the socket side, and the ends of the respective pipe members, the rotation of which is prevented by the pipe fixing device, are press-fitted from both sides of the opening of the socket which is rotated by the rotating means. Since there is provided a press-fitting device for welding the socket and the pipe member to each other by melting the resin due to frictional heat with the member, the pipe fixing device is moved by the press-fitting device while rotating the socket by rotating means. Since the end of the pipe member, which is prevented from rotating, can be pushed into both sides of the opening of the rotating socket, melting of the resin due to frictional heat between the socket and the pipe member proceeds smoothly, and Welding pipes can be easily welded to each other, and a welded pipe with high joint strength and excellent waterproof performance can be easily and quickly obtained even on site. Able to provide a manufacturing apparatus.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line DD of FIG. 1;

FIG. 3 is a cross-sectional view illustrating a state where the roller cover of the socket holding device is opened.

FIG. 4 is an explanatory view of a pipe member and a socket before welding according to the first embodiment.

5A is a sectional view taken along line EE of FIG. 1, and FIG. 5B is a perspective view illustrating a state where a chuck piece is opened.

FIG. 6 is an explanatory diagram of a collar according to the first embodiment.

FIG. 7 is a cross-sectional view of another embodiment of the socket.

FIG. 8 is a sectional view of another embodiment of the same pipe member.

FIG. 9 is a cross-sectional view illustrating a resin welded portion of the above.

10A is an explanatory view of a state in which a stopper is fitted in the groove of the movable base, FIG. 10B is an explanatory view of an operation when the stopper is removed, and FIG. 10C is an explanatory view of the groove. is there.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding pipe 2 Socket 3 Pipe member 3a End part 4 Opening 10 Socket holding device 11 Rotating means 12 Pipe fixing device 13 Press-fitting device

Claims (2)

[Claims] 1. An end of one resin pipe member is opposed to one side of an opening of a resin socket, and an end of another resin pipe member is opposed to another side of an opening of the socket. While rotating the socket around its axis, the end of each pipe member is press-fitted from both sides of the opening of the rotating socket while the rotation of each pipe member is prevented, so that the socket and the pipe member A method for manufacturing a welded pipe, wherein a socket and a pipe member are welded to each other by melting a resin by frictional heat. 2. A socket holding device for holding a resin socket, rotating means for rotating the socket held by the socket holding device around its axis, and movably disposed on both sides of the socket holding device. A pair of pipe fixing devices for fixing each pipe member in a state where ends of two resin pipe members are respectively opposed to both sides of the opening of the socket,
Each pipe fixing device is moved to the socket side, and the ends of the respective pipe members, the rotation of which is prevented by the pipe fixing device, are press-fitted from both sides of the opening of the socket which is rotated by the rotating means. An apparatus for manufacturing a welded pipe, comprising: a press-fitting device for welding a socket and a pipe member to each other by melting a resin by frictional heat with the member.