JPH11138643A - Melt-joint tool for resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To heap and stiffen a fusion-welded part between the resin pipe and the resin coupling, and solve problems of cracks and breakage caused by the concentration of stress in both the joint parts. SOLUTION: The fusion-welding tool is to fix and hold a resin pipe at the time of fusion-welding the resin pipe 1 and resin coupling 5, and the inner peripheral part of a press-fitting length regulation end face of a pair of half-split sleeve-like holding pieces 3A, 3B provided to the tool is formed into diameter- contracted faces 3a1, 3b1 in which the end part of a molten resin coupling 5 can be inserted deeply in the recessed part in the sleeve axial direction as being at its diameter inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusion welding tool for a resin pipe, and more particularly, to a header pipe system for branching from a header connected to a main pipe in an octopus shape and supplying water to a plurality of locations. When a resin pipe such as a polybutene pipe used as a branch pipe or the like is fusion-bonded to a resin joint made of polybutene or the like, a resin pipe fusion-bonding tool used as a manual tool for fixing and holding the resin pipe. It is.

[0002]

2. Description of the Related Art A conventional method of fusion splicing a resin pipe will be described. First, as shown in FIG. 15, a resin pipe 1 such as a polybutene pipe cut to a required length is cut. After the inner and outer surfaces of the end face 1a are chamfered with a knife or the like, as shown in FIG. 16, a pair of half-split cylindrical holding pieces in a manual fusion welding tool 2 to be described later near the end of the resin pipe 1. As shown in FIG. 17, a depth gauge 20 which is lightly pinched by 3A and 3B, and has a depth corresponding to a preset joining length at a pipe end protruding from the pinching point and is formed in a cylindrical shape, as shown in FIG. , Its bottom surface 20
a is abutted against the cut end surface 1a of the resin tube 1 and then the pair of half-cylinder holding pieces 3A, 3B of the fusion welding tool 2 are connected to one end surface 3 in the axial direction thereof.
a, 3b are end faces 20 on the opening side of the depth gauge 20;
b, the resin tube 1 is slid in the direction of the tube axis until it comes into contact with the resin tube 1, and the resin tube 1 is firmly fixed at the position so as not to move relative to the cutting end surface 1a of the resin tube 1 over a predetermined length. Define the melt length L of 1A.

[0003] Next, as shown in FIG. 18, a female heater portion 4A externally fitted to the end portion 1A of the resin tube 1 and a resin joint 5 having an inner diameter capable of being press-fitted outside the end portion 1A of the resin tube 1. Is heated in advance until the surface temperature thereof reaches a predetermined temperature, and the heat fusion heater 4 is heated in a state where it is heated to the predetermined temperature. As shown in FIG. 19, the end portion 1A of the resin pipe 1 and the end portion 5A of the resin joint 5 are inserted and fitted into the female heater portion 4A and the male heater portion 4B, respectively, for a predetermined time. By holding the heating, the end portions 1A and 5A are melted.

After the elapse of the heating and holding time, the resin tube 1 and the resin joint 5 are quickly connected to the heat welding heater 4.
20 and then, as shown in FIG.
The melted end portion 5A of the resin joint 5 is attached to the melted end portion 1A, and the end surface 5a of the end portion 5A is formed at one end surface of the pair of half-split cylindrical holding pieces 3A, 3B of the fusion joining tool 2 in the cylinder axis direction. The resin tube 1 is pressed by hand until it comes into contact with the resin tube 3a, 3b, and is pressed and held for a predetermined time.
And the resin joint 5 are fusion-bonded.

[0005] A fusion bonding tool 2 used for fixing and holding the resin pipe 1 during the above fusion bonding is shown in FIG.
As shown in FIG. 1 and FIG. 22, there is provided a pair of gripping operation pieces 6A and 6B that can be relatively rockingly operated, and a substantially U-shaped bending member 7 is provided at the tip of one gripping operation piece 6A. One of the pair of half-tubular holding pieces 3A and 3B is fixedly connected to the other half of the pair of half-holding pieces 3A and 3B, and the tip of the other gripping operation piece 6B is substantially Y-shaped. One end of the movable member 8 on the forked side is pivotally connected via a pin 9, and the other end of the movable member 8 on the forked side is pivotally connected via a pin 10 near the tip of the one gripping operation piece 6 </ b> A. In addition, the other half-split cylindrical holding piece 3B is fixedly connected to the tip of the movable member 8, thereby interlocking with the swinging operation of the pair of gripping operation pieces 6A and 6B. A pair of half-tubular holding pieces 3A, 3B are provided on both sides of the resin pipe 1 in the radial direction. It is configured to be switched between the posture for releasing posture and clamped to Luo clamping.

The pair of half-tubular holding pieces 3A and 3B are connected to the resin tube 1 between an intermediate portion on the forked side of the movable member 8 and an intermediate portion of the one gripping operation piece 6A. The other end of the movable link 13, one end of which is pivotally mounted via a pin 12 at a position close to the tip of the other gripping operation piece 6 </ b> B, while a coil spring 11 that biases the operation in the holding release direction is stretched. A portion is slidably fitted and held in a groove portion 6a formed in a rear end portion of the one gripping operation piece 6A, and a pin 14 is provided on a rear end side of the other gripping operation piece 6B via a pin 14. One end of the lever member 15 is pivotally connected to the lever member 15. The lever member 15 is urged by a winding spring 16 in a direction in which the lever member 15 is held in contact with the gripping operation piece 6 </ b> B. Grip operation piece 6A, When the user grips B so as to be relatively close to each other against the urging force of the coil spring 11, it contacts the middle side of the movable link 13 to change the relative approach posture of the pair of gripping operation pieces 6A and 6B. A holding cam surface 17 is formed. Thereby, the pair of half-split cylindrical holding pieces 3A, 3B can be stably held in the holding posture with respect to the resin tube 1 in conjunction with the swinging operation of the pair of holding operation pieces 6A, 6B.

Further, a screw member 18 whose leading end abuts the rear end of the movable link 13 is screwed and held at the rear end of the one gripping operation piece 6A.
By pressing the movable link 13 in conjunction with the screwing of 8, the swing amount of the other gripping operation piece 6B with respect to the one gripping operation piece 6A can be adjusted, whereby the pair of half-split cylindrical holding pieces 3A can be adjusted. , 3B to adjust the holding force on the resin tube 1. In addition, since the fusion bonding tool 2 having the above-described configuration is conventionally known, a detailed description of its own operation will be omitted.

[0008]

However, in the conventional fusion welding tool 2 having the above-described structure, one end surfaces 3a, 3b of the pair of half-split cylindrical holding pieces 3A, 3B in the direction of the cylinder axis are aligned with the cylinder axis. And a flat end surface 5a of the resin joint 5, the end surface 5a of the melted end portion 5A is flat end surfaces 3a, 3b of the pair of half-tubular holding pieces 3A, 3B.
When the resin pipe 1 and the resin joint 5 are fusion-bonded by press-fitting until they come in contact with
As shown in FIG. 20, a right-angled corner-shaped step portion where the outer peripheral surface of the resin pipe 1 and the end surface 5a of the resin joint 5 intersect is formed. In this way, if a right-angled corner-shaped step is formed at the joint between the two 1, 5 when the bending load or the like is applied to the resin pipe 1 or the resin joint 5 during actual use, the joint is formed. There is a problem in that stress tends to concentrate on a step portion having a right-angled corner at a location, and cracks and breakage easily occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is intended to reinforce a joint between a resin pipe and a resin joint and to perform a strong fusion-bonding that is less likely to cause cracks or breakage. An object of the present invention is to provide a fusion bonding tool.

[0010]

SUMMARY OF THE INVENTION A resin pipe fusion joining tool according to the present invention can be press-fitted into an end portion extending over a predetermined length from a tube end of the resin tube and outside the end portion having a predetermined length of the resin tube. In order to fix and hold the resin pipe at the time of fusing and joining the resin pipe and the resin joint by heat-melting the end portions of the resin joint having a large inner diameter and then press-fitting and holding the two together by press-fitting them. A pair of gripping operation pieces configured to be relatively swingable, and the diameter of the resin pipe being adjusted in conjunction with the swinging operation of the pair of gripping pieces. The end face that can be switched between a posture sandwiched from both sides in the direction and a posture released from being sandwiched, and that regulates a press-fit length by contacting an end face of the resin joint pressed into an end portion of the sandwiched resin pipe. Having a pair of half-split cylindrical holding pieces, The inner peripheral side portion of the press-fitting length regulating end surface of the half-split cylindrical holding piece is formed into a reduced diameter surface that allows the end portion of the molten resin joint to be able to penetrate deeper into the axial direction of the cylinder toward the inner side. is there.

[0011]

As described above, the inner peripheral portion of the press-fitting length regulating end face of the pair of half-split cylindrical holding pieces can be inserted deeper into the inner end of the molten resin joint in the axial direction of the cylinder as the inside diameter becomes larger. When it is formed on the reduced diameter surface, it becomes possible to reinforce the welded joint portion between the resin pipe and the resin joint by building up.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall perspective view of a fusion splicing tool for resin pipes according to the present invention. The fusion splicing tool 2 is basically the same as the conventional fusion splicing tool 2 shown in FIGS. Since it has a configuration, corresponding components are denoted by the same reference numerals, and detailed description thereof will be omitted. Only different points will be described below.

That is, a pair of half-tubular holding pieces 3A, 3B
Among them, a rectangular plate member is formed on the top of the holding piece 3A fixedly connected to the distal end of one of the gripping operation pieces 6A via a substantially bent member 7, and one end in the long side direction thereof Length defining gauge 21 having gauge end face 21A on the side
A pin-like member 23 (for example, a bolt) fixed to the holding piece 3A by screwing into the long hole 22 formed in the upper surface portion thereof and being screwed to the holding piece 3A; and a head of the pin-like member 23 Annular disc spring (not shown) interposed between the spring and the gauge 21
As shown in FIG. 2, the gauge end face 21A of the gauge 21 is slidably moved in the direction of the cylinder axis through the press-fitting length regulating end face of the holding piece 3A. As shown in FIG. 3, the measurement end position protruding outward by a predetermined joining length (melting length L) from the measurement end position 3 a, and the gauge end surface 21 A is in contact with the press-fit length regulating end surface 3 a in the holding piece 3 A. It is configured to be displaceable to a non-operating position that has been retired to be flush. The pin-shaped member 23 is configured to apply friction to the gauge 21 to such an extent that the gauge 21 does not easily slide when the gauge 21 receives vibration or the like.

Next, a method (procedure) for fusing and joining the resin pipe 1 and the resin joint 5 using the fusion welding tool 2 having the above configuration will be described. First, as shown in FIG. ,
Resin tube 1 such as polybutene pipe cut to required length
After the inner and outer surfaces of the cut end surface 1a are chamfered with a knife or the like, as shown by the solid line in FIGS. 2 and 4, the gauge 21 is moved outward with its gauge end surface 21A protruding outward. Welding tool 2 in a state of being displaced
After a portion near the end of the resin pipe 1 is lightly held by the pair of half-tubular holding pieces 3A and 3B in
The fusion bonding tool 2 is slid in the tube axis direction so that the gauge end surface 21A of the first tube 1 coincides with the cut end surface 1a of the resin tube 1 to perform a predetermined measurement. , 3B, the resin tube 1 is firmly fixed and clamped so as not to move relatively, so that the molten length L of the end portion 1A extending from the cut end surface 1a of the resin tube 1 to a predetermined length.
Measure and specify.

Next, as shown by phantom lines in FIGS. 3 and 4, the gauge 21 is so adjusted that its gauge end face 21A is flush with the press-fit length regulating end faces 3a, 3b of the holding pieces 3A, 3B. After being displaced to the retreated non-operation position, as shown in FIG. 5, the female heater portion 4A and the end portion 1 of the resin tube 1 are fitted to the end portion 1A of the resin tube 1.
A heat welding heater 4 having a male heater portion 4B fitted inside an end portion 5A of a resin joint 5 having an inner diameter capable of being press-fitted outside of A is heated in advance until the surface temperature thereof reaches a predetermined temperature, While being heated to a predetermined temperature, the female heater section 4A and the male heater section 4B of the heat fusion heater 4
As shown in FIG. 6, the end portion 1A of the resin tube 1 and the end portion 5A of the resin joint 5 are inserted and fitted, respectively, and the heating is maintained for a predetermined time, thereby the end portions 1A.
A and 5A are melted.

After the elapse of the heating and holding time, the resin tube 1 and the resin joint 5 are quickly connected to the heat welding heater 4.
7 and the molten end portion 1A of the resin joint 5 is attached to the molten end portion 1A of the resin pipe 1 as shown in FIG.
A by hand until the end face 5a thereof comes into contact with the press-fit length regulating end faces 3a, 3b of the pair of half-split cylindrical holding pieces 3A, 3B of the fusion welding tool 2 and the gauge end face 21A of the gauge 21. The resin pipe 1 and the resin joint 5 are fusion-bonded by press-fitting and pressing and holding the same for a predetermined time.

As described above, the gauge 21 for measuring and defining the molten length (joining length) of the resin pipe 1 is provided in one of the pair of half-tubular holding pieces 3A and 3B in the welding and joining tool 2. Since the gauge 21 is attached to the holding piece 3A itself, the gauge 21 is always handled and managed together with the fusion welding tool 2 to reduce the number of tools to be prepared at an actual welding site such as a plumbing site. Possible and gauge 21
Is not lost, and it is not forgotten to bring it to the joining site. Also, when the fusion length of the end portion 1A of the resin tube 1 is defined, the fusion bonding tool is displaced to the operating position with the bonding length defining gauge 21 attached to the one holding piece 3A. The prescribed melting length can be easily and quickly measured and fixed by a work procedure in which the entire resin 2 is slid in the pipe axis direction and the resin tube 1 is fixedly clamped by the pair of clamping pieces 3A and 3B. .

FIGS. 8 to 12 show another embodiment of the resin pipe fusion joining tool according to the present invention, which has a gauge end face 21A at one end in the longitudinal direction. As shown in FIG. 8, the gauge 21 is attached to the top of one of the pair of half-tubular holding pieces 3A and 3B,
The long hole 22 (which may be a round hole) and the long hole 2
2, a pin-shaped member 23 (for example, a bolt), a ring-shaped disc spring (not shown) interposed between the gauge 21 and the head of the pin-shaped member 23, and a lock nut 25. 9 and 11 by sliding around the axis of the pin-shaped member 23 at a fixed sliding position between the measurement operation position shown in FIGS. 9 and 11 and the non-measurement operation position shown in FIG. It is mounted so that it can be displaced. Further, a coil spring 24 for constantly moving the gauge 21 upward while biasing the outer periphery of the pin-shaped member 23 is interposed between the gauge 21 and the one holding piece 3A. By pressing the head of the pin-shaped member 23 against the elastic force of the coil spring 24 while the gauge 21 is displaced to the measurement operation position shown in FIGS. 9 and 11, as shown in FIG. The rear surface 21B of the gauge end surface 21A is configured to be elastically displaceable to a radial position where the end surface 1a of the end portion 1A of the resin tube 1 abuts.

In the fusion welding tool for resin pipes according to the embodiment shown in FIGS. 8 to 12, the gauge 21 for defining the molten length is simply rotated about the axis of the pin-shaped member 23. Not only can the gauge 21 be easily and easily displaced between the measurement operation position and the non-measurement operation position, but the end surface 1a of the end portion 1A of the resin tube 1 abuts against the back surface 21B of the gauge end surface 21A. It is possible to measure the melt length by measuring the melt length, and it is possible to measure the specified melt length very accurately as compared with the visual measurement.

FIG. 13 shows a pair of half-tubular holding pieces 3A, 3B in the resin pipe fusion joining tool of each of the above embodiments.
The inner peripheral side portions of the press-fitting length regulating end surfaces 3a and 3b are tapered (or as shown in the drawing) so that the end portion 5A of the molten resin joint 5 can be inserted deeper into the cylinder axial direction toward the inner side. It is shown that they are formed on the reduced diameter surfaces 3a1 and 3b1 (not arc-shaped). When a resin pipe fusion joining tool having such a reduced diameter surface 3a1 or 3b1 is used, FIG.
As shown in FIG. 4, it is possible to form a reinforcement portion X at a fusion-bonded portion between the end portion 1A of the resin pipe 1 and the end portion 5A of the resin joint 5 to reinforce it.
The conventional problems such as cracks or breakage due to stress concentration at the joints can be solved. In the fusion welding tool for resin pipes shown in FIG. 1, as shown in FIG. 5, the inner peripheral side portion of the gauge end face 21A is formed into a tapered (or arc-shaped, not shown) diameter reducing surface. After that, the thickened portion X is formed to be large continuously from the reduced diameter surface 3a1 of the cylindrical holding piece 3A.

[0021]

According to the present invention, it is possible to reinforce the welded joint between the resin pipe and the resin joint by building up the welded joint, and at the time of use after joining, the joints of the two may crack due to stress concentration. And breakage can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall external perspective view showing an embodiment of a resin pipe fusion joining tool according to the present invention.

FIG. 2 is a perspective view of a main part of the tool, showing a state where a gauge is displaced to a measurement operation position.

FIG. 3 is a perspective view of a main part of the same tool showing a state where a gauge is displaced to a non-operating position.

FIG. 4 is a vertical sectional side view of a main part, illustrating a state in which the molten length is measured using the same tool.

FIG. 5 is a longitudinal sectional side view of a main part illustrating a preparation state of a heat fusion heater.

FIG. 6 is a vertical sectional side view of a main part, illustrating a heating and holding state by the heat fusion heater.

FIG. 7 is a longitudinal sectional side view of a main part illustrating a crimped state of a resin pipe and a resin joint.

FIG. 8 is a perspective view of a main part showing another embodiment of the resin pipe fusion joining tool according to the present invention.

FIG. 9 is a perspective view of a main part of the tool, showing a state where the gauge is displaced to a measurement operation position.

FIG. 10 is a perspective view of a main part showing a state where the gauge is displaced to a non-operating position in the same tool.

FIG. 11 is a longitudinal sectional side view of a main part showing a state in which the gauge is displaced to the measurement operation position in the same tool.

FIG. 12 is a longitudinal sectional side view of a main part, illustrating a state in which the molten length is measured using a gauge in the tool.

FIG. 13 is an enlarged vertical sectional side view of a main part showing another embodiment of the resin pipe fusion joining tool according to the present invention.

FIG. 14 is an enlarged vertical sectional side view of a main part showing a state where the resin pipe and the resin joint are fused together using the above-mentioned tool.

FIG. 15 is a longitudinal sectional side view of a main part showing a chamfered state of an end portion of a resin pipe to be joined.

FIG. 16 is a perspective view of a main part showing a relationship between a depth gauge and a fusion bonding tool used in a conventional fusion bonding method.

FIG. 17 is a longitudinal sectional side view of a main part illustrating a state in which a melt length is measured using a conventional depth gauge.

FIG. 18 is a longitudinal sectional side view of a main part for explaining a preparation state of a heat fusion heater used in a conventional fusion bonding method.

FIG. 19 is a vertical sectional side view of a main part illustrating a state of heating and holding by a heat fusion heater in a conventional fusion bonding method.

FIG. 20 is a longitudinal sectional side view of a main part illustrating a crimped state of a resin pipe and a resin joint in a conventional fusion bonding method.

FIG. 21 is an overall external perspective view of a conventional resin pipe fusion joining tool.

FIG. 22 is a side sectional view showing a specific configuration of a conventional resin pipe fusion joining tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin pipe 1A Pipe end part 1a Pipe end face 2 Fusion welding tool 3A, 3B Half-split cylindrical holding piece 3a, 3b End face for press-fitting length control 3a1, 3b1 Reduced diameter face 5 Resin joint 5A Joint end part 6A, 6B Gripping Operation piece

Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29L 23:00

Claims (1)

[Claims] An end portion of a resin pipe extending from a pipe end to a predetermined length and an end portion of a resin joint having an inner diameter press-fittable outside the end portion of the resin pipe having a predetermined length are heated and melted, respectively. A resin pipe fusion-bonding tool for fixing and holding the resin pipe when the resin pipe and the resin joint are fusion-bonded by press-fitting and press-fitting the two together. A pair of gripping operation pieces configured to be capable of moving operation, and interlocking with the swinging operation of the pair of gripping operation pieces, switching between a posture in which the resin tube is sandwiched from outside in both radial directions and a posture in which the resin tube is released. Possible, and a pair of half-split cylindrical holding pieces having an end face that regulates the press-fitting length by abutting against the end face of the resin joint pressed into the end portion of the held resin pipe, Press-fit length regulating end of the pair of half-tubular holding pieces The inner peripheral portion is fusion welding of the resin tube, characterized in that it is formed in the condensation diameter surface to deeper penetrate capable enough radially inward end portion of the molten plastic joint to the rear side of the cylinder axis direction.