JP2012067864A - Welding joint, welding device and welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding joint that can accurately be welded and integrated with a tube at a preset relative angle by easy operation, and is improved in the enhancement of productivity and quality.SOLUTION: The synthetic resin welding joint has a joint body 4C which is held to a clamp 5 of a welding device A so as to surround it and to be held thereto, and a pipe end 4A which can be engaged with the end 11A of the synthetic resin tube 11. The pipe end 4A is externally surrounded by a heat generation part 7 of the welding device A in order to heat and weld a joint s formed by the engagement of the tube end 11A and the pipe end 4A, and the joint body 4C can be attached to the welding device A while being externally surrounded by the clamp 5. Outer peripheral irregularities 4B engaged with inner peripheral irregularities 5A formed at the internal periphery of the clamp 5 are formed at the joint body 4C, and in a clamped state, an angular position with respect to the clamp 5 of the joint body 4C around the axial core Y of the pipe end 4A is fixed by the engagement of the inner peripheral irregularities 5A and the outer peripheral irregularities 4B.

Description

  The present invention relates to a welding joint made of synthetic resin, a welding apparatus for welding and integrating a synthetic resin welding joint and a synthetic resin tube, and a synthetic resin welding joint and a synthetic resin tube using a welding apparatus. The present invention relates to a welding method to be converted.

  As this type of welding joint, welding apparatus, and welding method, those disclosed in Patent Document 1 are known. That is, a welding apparatus (1) for welding and integrating a resin joint (100), which is a synthetic resin welding joint, and a joint formed by fitting the resin joint (100) and the resin tube (200). Patent Document 1 discloses a welding method in which the resin joint (100) and the resin tube (200) are welded and integrated using the welding device (1).

  That is, it has a welding head (10) including a clamper (30) capable of positioning and holding the resin joint (100) and a heating unit (40) for heating the joint (J), and the clamper (30) A closed position having a joint holding part (31) fitted to the positioning protrusion (110) of the joint (100) and closed so that the joint holding part (31) is fitted to the positioning protrusion (110); It is supported so as to be able to swing between an open position where the fitting can be released. And a heating part (40) is arrange | positioned so that a junction part (J) may be enclosed in a closed position, heating part (40), hold | maintaining the resin joint (100) in the state positioned by the joint holding part (31). The joint (J) is heated and welded.

  The above-described welding apparatus and method will be described in a simplified manner. As shown in FIG. 14, the welding apparatus A includes a joint holding part 25 that surrounds and holds the welding joint 24 and a tube holding part 26 that surrounds and holds the tube 31. And a heating means (heater) 27 that is externally fitted to a holder 34 that is externally mounted on the pipe end 24A of the welded joint 24 is disposed between the holding portions 25 and 26. . Each of the joint holding part 25, the tube holding part 26, and the heat generating means 27 is formed by pivotally connecting a lower structure 25k, 26k, 27k and an upper structure 25j, 26j, 27j. 25, 26, and 27 are configured in a known structure that swings and opens integrally.

  In order to melt and weld the joint portion s between the weld joint 24 and the tube 31, first, the end portion 31 </ b> A of the tube 31 is inserted into the pipe end portion 24 </ b> A of the weld joint 24 on which the holder 34 is sheathed (internal fitting). To perform the insertion process. Next, the welded joint 24 with the tube 31 is connected to the lower structure 25k in a state where the annular protrusion (positioning ring rib) 24B is fitted in the semi-annular groove 38 of the lower structure 25k of the joint holding part 25. , 26k, and 27k are set and placed.

  The tube 31 is inserted into the welded joint 1 until the end surface 31t, which is the distal end surface thereof, abuts the stepped side surface 24c of the tube end 24A, and then the upper structures 25j, 26j, and 27j are moved downward. An attachment process is performed in which the welded joint 24 is clamped and held by the joint holding portion 25 and the tube 31 is held by the tube holding portion 26 while being locked and coupled to the lower structures 25k, 26k, and 27k. Then, the heat generating means 7 is operated to melt the joint portion s, and a welding process is performed in which the tube end portion 24A of the welded joint 24 and the end portion 31A of the tube 31 are welded and integrated.

  By the way, the welded joint is often used as means for connecting the tubes to each other by connecting the tubes to both ends of the pipes.For example, in a piping facility passing through a predetermined route in a factory, Often, bending tubes such as elbow tubes or the like, or straight tubes having a directivity in the axial direction and bent tubes are welded and integrated with a predetermined relative accuracy. . In such a case, in the prior art, firstly, the first welding for welding one tube and the welded joint is performed, and then the welded joint in which the one tube is integrated and the other tube have a desired relative accuracy. The method of attaching and welding is taken.

  In this case, in order to give relative accuracy, for example, the accuracy of the other tube with respect to the welding joint or welding device is mounted while measuring with a measuring instrument, or the accuracy of the welding joint with respect to the welding device without bending the bent tube. There was only a cumbersome and difficult way to wear while planning. For this reason, it takes time for the welding work to be inferior in productivity, and the angle as a product after welding (in which a pair of tubes are integrated by a welded joint) tends to vary.

JP 2008-069880 A

  It is an object of the present invention to provide a welded joint and weld that can be integrated and welded at a predetermined relative angle with a predetermined relative angle in an easy and accurate manner so that productivity and quality can be improved. It is in the point which develops and provides a device and a welding method.

The invention according to claim 1 includes a joint body portion 4C that is enclosed and held by the clamp portion 5 of the welding apparatus A, and a tube end portion 4A that can be fitted to the tube end portion 11A of the synthetic resin tube 11. The tube end portion 4A is surrounded by the heat generating portion 7 of the welding apparatus A to heat and melt the joint portion s formed by fitting the tube end portion 11A and the tube end portion 4A, and In the weld joint made of synthetic resin, which is configured to be attachable to the welding apparatus A in a clamped state in which the joint body portion 4C is enclosed and held by the clamp portion 5,
The joint body portion 4C is provided with an outer peripheral uneven portion 4B that fits into an inner peripheral uneven portion 5A formed on the inner peripheral portion of the clamp portion 5, and when the clamp body is in the clamped state, the inner peripheral uneven portion 5A. And the outer circumferential uneven part 4B are fitted so that the angular position of the joint body part 4C with respect to the clamp part 5 around the axis Y of the pipe end part 4A is determined. It is.

  The invention according to claim 2 is the welding joint according to claim 1, wherein the outer circumferential uneven portion 4 </ b> B is formed in the welding apparatus A in a state having the engaging protrusion 23 extending in the radial direction with respect to the axis Y. It comprises an outer peripheral flange 21 fitted in the annular circumferential groove 18 and a notch 22 provided in the outer peripheral flange 21 so as to be fitted into the engaging protrusion 23.

  According to a third aspect of the present invention, there is provided the heat generating portion 7 surrounding the joint portion s formed by fitting the tube end portion 4A of the synthetic resin welded joint 4 and the tube end portion 11A of the synthetic resin tube 11; A clamp portion 5 that can be gripped by surrounding the welding joint 4, and the joint portion is heated by the heat generation portion 7 in a clamped state where the welding joint 4 is gripped by the clamp portion 5. In the resin pipe welding apparatus configured to be able to weld the pipe end portion 4A and the tube end portion 11A by heating and melting s, the clamp portion 5 is formed on the outer peripheral portion of the weld joint 4. When the inner peripheral uneven portion 5A is provided to be fitted to the outer peripheral uneven portion 4B and is in the clamped state, the outer peripheral uneven portion 4B and the inner peripheral uneven portion 5A are fitted to each other and the axis of the pipe end portion 4A The weld joint of the clamp part 5 around the center Y It is characterized in being configured so that the angle position is determined relative to.

  According to a fourth aspect of the present invention, in the welding apparatus according to the third aspect, the inner circumferential uneven portion 5A is formed in the welded joint 4 with a notch 22 extending in the radial direction with respect to the axis Y. The annular circumferential groove 18 that is externally fitted to the outer peripheral flange 21 and the engaging projection 23 that is provided in the annular circumferential groove 18 so as to be fitted into the notch 22 are characterized in that it is characterized in that

  The invention according to claim 5 includes the heat generating portion 7 surrounding the joint portion s formed by fitting the tube end portion 4A of the synthetic resin welded joint 4 and the tube end portion 11A of the synthetic resin tube 11; A clamp portion 5 that can be gripped by surrounding the welding joint 4, and the joint portion is heated by the heat generation portion 7 in a clamped state where the welding joint 4 is gripped by the clamp portion 5. In the welding method of welding the tube end portion 4A and the tube end portion 11A using a welding apparatus A capable of welding the tube end portion 4A and the tube end portion 11A by heating and melting s, An inner peripheral uneven portion 5A is provided on the inner peripheral portion of the clamp portion 5, and an uneven outer peripheral portion 4B is provided on the outer peripheral portion of the welded joint 4. In the clamped state, the inner peripheral uneven portion 5A and the outer peripheral portion are provided. The tube end portion 4 is fitted with the uneven portion 4B. In which the axial center Y said at around welded joints 4, characterized in that to determine the relative angular position between the clamp portion 5.

  According to a sixth aspect of the present invention, in the welding method according to the fifth aspect, as the outer circumferential uneven portion 4B, an outer circumferential flange 21 formed with a notch 22 extending in the radial direction with respect to the axis Y is used. As the inner circumferential uneven portion 5A, an annular circumferential groove 18 that has an engaging projection 23 that fits into the notch 22 and that can be fitted onto the outer circumferential flange 21 is used.

  According to the invention of claim 1, although described in detail in the section of the embodiment, the joint body portion and the clamp portion are fitted by fitting the inner peripheral uneven portion and the outer peripheral uneven portion, that is, the welded joint and the welding device. The relative angular position with respect to the axial center of the tube can be determined, whereby the relative angle between the tube welded to one end of the weld joint and the tube welded to the other end can be determined. The operation of m can be as simple as fitting the inner and outer concavo-convex portions with the outer concavo-convex portion. As a result, it is possible to provide a welded joint that can be easily and accurately integrated by welding and integrating the welded joint and the tube at a predetermined relative angle, and can be improved so that productivity and quality can be improved. it can.

  According to the second aspect of the present invention, the outer peripheral uneven portion is economically claimed by a simple structure including an outer peripheral flange fitted into the annular circumferential groove having the engaging protrusion and a notch fitted to the engaging protrusion. The said effect by the structure of claim | item 1 can be acquired.

  According to invention of Claim 3, the welding apparatus which obtains an effect equivalent to the said effect by the structure of Claim 1 can be provided.

  According to invention of Claim 4, the welding apparatus which acquires the effect equivalent to the said effect by the structure of Claim 2 can be provided.

  According to invention of Claim 5, the welding method which acquires the effect equivalent to the said effect by the structure of Claim 1 can be provided.

  According to invention of Claim 6, the welding method which acquires the effect equivalent to the said effect by the structure of Claim 2 can be provided.

A weld joint is shown, (a) is a front view, (b) is a side view. Front view of resin pipe welding equipment The perspective view of each of the apparatus main body and the tube holder separated from each other Schematic sectional view showing the main part of the welding equipment in the welding process (A) Action diagram showing clamping process, (b) Action diagram showing external fitting process Action diagram showing set process Action diagram showing joint gripping and angle adjustment process in one tube Action diagram showing joint gripping and angle adjustment process in the other tube Various welding joints are shown, (a) is a welding joint for different diameter pipes, (b) is an elbow type welding joint, (c) is a cheese type welding joint. Various concave shapes of the outer peripheral flange are shown, (a) is a circular groove, (b) is a square groove, (c) is a trapezoidal groove, (d) is a triangular groove Various projection shapes of the outer peripheral flange are shown, (a) is an arc convex, (b) is a square convex, (c) is a trapezoidal convex, (d) is a triangular convex Shows various angular intervals of the outer flange, (a) 90 degrees, (b) 45 degrees, (c) 30 degrees Action diagram showing the joint gripping situation of the clamp part with a structure different from FIG. Schematic cross-sectional view showing the main part of the welding apparatus in the conventional welding process and its state

  Embodiments of a welding joint, a welding apparatus, and a welding method according to the present invention will be described below with reference to the drawings.

[Example 1]
As shown in FIGS. 2 to 4, the welding apparatus A includes a lower structure 1 </ b> K that includes the legs 3 and an upper structure 1 </ b> J that is pivotally supported by a lateral axis P on the lower structure 1 </ b> K, And a separate clamp (tube holder) 2. In this welding apparatus A, the end portion of the weld joint 4 and the end portion of the tube 11 are inserted into each other, and the joint portion s, which is a portion, is heated and fused and integrated. The welding apparatus main body 1 is configured to sandwich and support a clamp 2 that surrounds and holds (holds) the tube 11 and a welding joint 4 that is inserted into the tube 11 (see FIG. 4).

  As shown in FIGS. 2 to 4, the welding apparatus main body 1 is engaged with a joint holding portion (an example of a clamp portion) 5 that holds the welding joint 4 with the welding joint 4 interposed therebetween, and the clamp 2 in a state where the relative position in the tube longitudinal direction is determined. The clamp holding part 6 that can be stopped, the heat generating part (heating means) 7 disposed between the joint holding part 5 and the clamp holding part 6, and the upper structure 1J are locked and held at the closed position in which the upper structure 1J is swung downward. For example, a buckle 8 is provided. A device base 1A from which various lead wires e and the like are taken out is provided on the axis P side of the lower structure 1K, and a locking piece 8a for locking the buckle 8 is provided on the swing end (on the side opposite to the axis P). Is equipped.

  Each of the joint holding part 5, the clamp holding part (an example of a locking part) 6, and the heat generating part 7 is divided into a half lower part 5a, 6a, 7a incorporated into the lower structure 1K and a half incorporated into the upper structure 1J. It consists of split upper parts 5b, 6b, 7b. 2 and 4 show a welding operation state in which the upper structure 1J is lowered and swung to be locked to the lower structure 1K with the buckle 8, and FIG. 3 is an open standby state in which the upper structure 1J is swung up and down. Is shown. The open standby state (FIG. 3) is an open posture in which the welding joint 4 and the clamp 2 are detached from the welding apparatus main body 1, and the welding action state (FIG. 2) is a closed state in which the joining portion s is heated and welded. It is posture.

  As shown in FIGS. 4, 7, and 8, the joint holding portion 5 includes an annular circumferential groove 18 having a rectangular cross section, and an engaging protrusion 23 formed in the annular circumferential groove 18. It is provided with a circumferential uneven portion 5A. The annular circumferential groove 18 is a groove having a rectangular cross section having a pair of side circumferential surfaces 18a, 18a and an inner circumferential surface 18b, and the groove width (dimension in the axis Y direction) is slightly larger than the width of the annular protrusion 4B (described later). large. The engaging protrusion 23 is a portion that protrudes radially inward from the inner peripheral surface 18b over the entire groove width in a substantially semicircular shape when viewed from the axial center Y direction, and is formed at the lowermost end of the annular peripheral groove 18. ing.

  In other words, when the inner peripheral concavo-convex portion 5A fitted to the annular protrusion 4B formed on the outer peripheral portion of the welded joint 4 is provided and the joint holding portion 5 is in the clamped state of gripping the joint main body portion 4C, the annular protrusion 4B. And the inner circumferential uneven portion 5A are fitted to determine the angular position of the joint holding portion 5 with respect to the welded joint 4 around the axis Y of the pipe end portion 4A, that is, a relative angle determining mechanism E described later is configured. ing. The inner circumferential uneven portion 5A is fitted in the notch with the annular circumferential groove 18 fitted on the outer peripheral flange 21 formed in the welded joint 4 with the notch 22 extending in the radial direction with respect to the axis Y. Accordingly, the engaging projection 23 is provided in the annular circumferential groove 18.

  As shown in FIGS. 2 to 5, the clamp 2 is composed of upper and lower halved holding pieces 2 </ b> A and 2 </ b> B that can swing and open with an axis X. A locking lever 9 for maintaining the clamp 2 in a closed state is pivotally connected to the opposite end of the axis X in the lower half holding piece 2B, and the axis X in the upper half holding piece 2A is pivotally connected. A longitudinal groove 10 is formed at the opposite end of the body for inserting the body 9a of the locking lever 9 and locking the head 9b having a larger diameter. Further, the half-divided holding pieces 2A and 2B are divided into half-divided inner peripheral surfaces 12A and 12B that form a grip portion 12 that surrounds and holds the tube 11, and a half-split that forms an annular ridge 13 (described later). Projections 13A and 13B are formed.

  2 and 5 show the gripping state in which the upper half holding piece 2A swings downward and is locked to the lower half holding piece 2B by the locking lever 9, and FIG. 3 shows the upper half holding piece 2A. Shows the open connection state in which the swaying rocks. The connection open state (FIG. 3) is an open posture in which the tube 11 is attached to and detached from the clamp 2, and the gripping action state (FIG. 2) is a closed state in which the tube 11 is enclosed and held (gripped) by the grip portion 12. It is posture. In addition, the part between the main-body part in each holding piece 2A, 2B and the cyclic | annular protruding item | line 13 is formed in the cyclic | annular clearance groove | channel 13C which has some distance in the axial center T direction.

  As shown in FIGS. 1 and 4 to 6, the welded joint 4 according to the first embodiment is a joint including a pipe end portion 4 </ b> A formed at each of both end portions and an annular protrusion 4 </ b> B positioned in the center in the axis Y direction. A cylindrical body (union) made of fluororesin (an example of synthetic resin) having a main body portion 4C and a linear internal flow path 4a. Each tube end portion 4A includes an insertion inner peripheral portion 15 in which the tube 11 is fitted, and a mounting outer peripheral surface 16 in which a holder (described later) 14 is externally mounted. The diameter of the mounting outer peripheral surface 16 is slightly smaller than the diameter of the outer peripheral surface 20 of the joint main body portion 4C. As shown in FIGS. 4 to 6, the holder 14 is a basic thin-walled fluororesin tubular member having an annular thick end portion 14 </ b> A projecting radially outward at one end, and the mounting outer peripheral surface 16 of the welded joint 4. It is used with external fitting.

  As shown in FIGS. 1 (a) and 1 (b), the annular protrusion 4B has a curved outer circumferential flange 21 and a notch 22 curve formed at a total of 8 positions at an equal angle of 45 degrees with respect to the axis Y. It is comprised as an outer periphery uneven | corrugated part which consists of a dent. The notch 22 has a shape that diverges from the outer peripheral surface 21a of the outer peripheral flange 21 into a curved shape (arc shape) as viewed from the axial center Y direction, and is about half the radial dimension of the outer peripheral flange 21. Have 1, 7, 8, and 13 illustrate a state of a single welded joint 4 in which the holder 14 is not provided.

  That is, the joint body portion 4C is provided with the outer peripheral uneven portion 4B that fits into the inner peripheral uneven portion 5A formed on the inner peripheral portion of the clamp portion (joint holding portion) 5, and the joint holding portion 5 uses the joint main body portion. When in the clamped state of gripping 4C, the annular circumferential groove 18 and the outer circumferential uneven portion 4B are fitted together so that the angular position of the joint body portion 4C relative to the joint holding portion 5 around the axis Y of the pipe end portion 4A is determined. That is, a relative angle determining mechanism E described later is configured. And the outer periphery uneven | corrugated | grooved part 4B has the engagement protrusion 23 extended in the radial direction regarding the axial center Y, the outer periphery flange 21 fitted in the annular circumferential groove 18 formed in the welding apparatus A, and the engagement protrusion 23 It is comprised with the notch 22 provided in the outer periphery flange 21 so that it may fit in.

  As shown in FIGS. 4 to 6, the tube 11 is a tubular body made of fluororesin (an example of synthetic resin) having an internal flow path 11 a having the same diameter as the internal flow path 4 a of the welded joint 4. The end surface 11t of the tube end portion 11A on the insertion side to the welded joint 4 is formed as a vertical surface that exhibits exactly 90 degrees with respect to the tube axis T by a pre-cutting process or the like. The tube end portion 11A and the tube end portion 4A into which the tube end portion 11A is inserted constitute a joint portion s so that the two portions 11A and 4A are integrated by welding.

  The welding apparatus A includes a clamp 2 capable of encircling and locking the tube 11 at a predetermined distance r from the end thereof, and a welding capable of locking the clamp 2 in a state where the relative position in the longitudinal direction of the tube 11 is determined. It has an apparatus main body 1 and positioning means B for determining the relative positions of these two 1, 1 and the tube end 4A of the synthetic resin welded joint 4 and the tube end 11A of the synthetic resin tube 11 are fitted together. The joined portion s is surrounded by a heat generating portion 7 and the heat generated by the heat generating portion 7 heats and melts the joined portion s so that the tube end portion 4A and the tube end portion 11A can be integrated with each other. Has been.

  The positioning means B for determining the relative position of the clamp 2 and the welding apparatus main body 1 in the axis T direction (tube longitudinal direction) in the clamp holding portion 6 for relatively locking the clamp 2 and the welding apparatus main body 1 can be fitted to each other. The annular ridge 13 and the annular groove 17 are distributed and arranged between the clamp 2 and the welding apparatus main body 1. An annular groove 13 is formed in the clamp 2 in a side projecting state, and an annular groove 17 is formed in the clamp holding portion 6 of the welding apparatus main body 1 to constitute the positioning means B. For example, it is possible to provide a means for providing an annular ridge on the welding apparatus main body 1 in a state of projecting laterally therefrom, and a means for providing an annular groove in the clamp 2, in which case the structure shown in FIGS. Compared with the device, the width of the device A is likely to be enlarged.

  As shown in FIG. 3 and FIG. 4, a positioning mechanism C is provided for holding the welding joint 4 in an enclosed state by the welding apparatus main body 1 in a state where the position in the axial center Y direction is determined. That is, the positioning mechanism C includes an annular protrusion 4B formed on the welding joint 4 and an annular groove 18 formed on the joint holding portion 5 of the welding apparatus body 1. That is, if the annular protrusion 4B is fitted into the annular groove 18, the distance d in the axis Y direction between the inner peripheral side peripheral surface 4b of the annular protrusion 4B and the tube end surface 4t is determined.

  Next, a welding method using the welding apparatus A will be described. First, after passing the tube 11 through the clamp 2 in a slightly opened position from the open position or the closed position, the upper half-split holding piece 2A is lowered and swung, and the locking lever 9 is inserted into the vertical groove 10 as shown in FIG. As shown in FIG. 2, a gripping process is performed in which the tube 11 is enclosed and held (gripped) by the clamp 2. At this time, a dimension setting step is also performed in which the distance between the end surface 13a of the annular ridge 13 and the tube end surface 11t in the axial center T direction becomes a predetermined value n. Since the width dimension (axis center T direction dimension) of the annular ridge 13 is set to g, the distance dimension (axis center T dimension) between the inner side surface 13s of the annular ridge 13 and the tube end surface 11 is n + g. .

  For example, as shown in FIG. 5A for reference, the dimension setting step is convenient when a setting jig 19 is used. The tube end surface 11t is in contact with the first contact surface 19a, and the end surface 13a is in the first position. 2 When the tube 11 is clamped by being brought into contact with the abutting surface 19b, it is possible to easily lock (hold) the tube 11 with the clamp 2 in a state where the protruding amount becomes the predetermined value n. In addition, although illustration is abbreviate | omitted, the method of performing a dimension setting process using the jig | tool which directly measures the space | interval (n + g) of the inner side surface 13s of the cyclic | annular protruding item | line 13 and the tube end surface 11t may be used.

  Next, the welded joint 4 on which the holder 14 is already sheathed is inserted and fitted into the projecting end portion of the tube 11 from the annular ridge 13, and as shown in FIG. A joint insertion step is performed in which the welded joint 4 and the tube 11 are fitted and temporarily connected to the tube end 11A. At this time, the tube 11 is inserted until the end surface 11t of the tube 11 contacts the stepped side surface 4c inside the tube end 4A. The fitting length between the welded joint 4 and the tube 11 in a state in which the end surface 11t and the stepped side surface 4c are in contact with each other is f.

  When the temporary connection is completed, as shown in FIG. 6, the annular protrusion 4B of the weld joint 4 is fitted into the annular circumferential groove 18 of the halved lower portion 5a of the joint holding portion 5, and the annular protrusion 13 (bottom of the clamp 2) A loading step of placing and holding the temporary connection body of the tube 11 and the welded joint 4 with the clamp 2 on the lower structure 1k in a state in which the half protrusion 13B) is fitted into the half lower portion 6a of the clamp holding portion 6. Do.

  Here, the distance (axial center Y direction dimension) h between the side peripheral surface 18a on the far side of the annular peripheral groove 18 and the outer peripheral surface 17a of the annular concave groove 17 is a regular one where the end surface 11t and the step side surface 4c abut. The inner back side peripheral surface 4b of the annular protrusion 4B and the inner side surface 13s of the annular protrusion 13 when in the inserted state (in other words, the protruding amount of the tube end portion 11A from the annular protrusion 13 is n) Is set equal to or slightly smaller than the interval dimension [dimension in the axis Y (T) direction]. That is, dimension h = dimension d + dimension n + dimension g-dimension f is set.

  Then, after the loading process, the upper structure 1J in the upward swinging and opening position is moved downward and swinging, and the buckle 8 is engaged and clamped to the welding apparatus main body 1 as shown in FIG. A mounting step is performed in which the tube 11 and the welded joint 4 that are held in the outer space 2 are mounted so as to enable welding. Then, the heat generating portion 7 that is externally fitted to the holder 14 is energized to generate heat, and the joint portion s is heated and melted through the holder 14 to connect the tube end portion 11A and the tube end portion 4A. A welding process for integrating the welding is performed.

  That is, a clamp 2 capable of fixing the tube 11 to the outer periphery and a welding apparatus main body 1 capable of locking the clamp 2 in a state where the relative position in the longitudinal direction of the tube 11 is determined are prepared, and the tube 11 is connected to the end (end surface 11t). Resin that heats and welds the joint portion s in a state where the clamp 2 holding the tube 11 is locked to the welding apparatus main body 1 at a place separated by a predetermined distance (n) from the clamp 2. This is a tube welding method. In this welding Y method, a gripping process (including a dimension setting process) → a joint insertion process → a loading process → a mounting process → a welding process is performed.

  Of course, after the welding process is completed, the upper structure 1J is lifted and swung to take out the joint integrated product (the welded joint 4 and the tube 11 welded to each other) with the clamp 2, and the clamp 2 from the joint integrated product. A unclamping process is performed. These extraction process and clamping removal process are not complicated processes that cannot be understood unless they are specifically explained.

  Next, a method of welding and integrating the weld joint 4 and the tube 11 at a predetermined relative angle will be described. In the welding joint 4, the welding apparatus A, and the welding method according to the present invention, the relative angle determining mechanism E, for example, a first tube 11 </ b> W (tube 11) bent into an L shape or the like, and a Z shape or the like. When the bent second tube 11 </ b> Z (tube 11) is welded and integrated via the weld joint 4, a predetermined relative angle θ around the axis Y can be easily and reliably provided. It is devised so that it can.

  First, as shown in FIGS. 7 and 8, the relative angle determining mechanism E is constituted by an inner peripheral uneven portion 5 </ b> A of the welding apparatus main body 1 and an annular protrusion 4 </ b> B of the welded joint 4. In the above-described clamped state in which the joint main body 4C is gripped by 5, the welded joint 4 around the axis Y of the pipe end 4 </ b> A by fitting the inner circumferential irregularity 5 </ b> A and the annular projection 4 </ b> B that is the outer circumferential irregularity. And a relative angular position between the joint holding portion 5 as a clamp portion. In other words, the welded joint 4 is fitted with any one of the notches 22 and the engaging projection 23 and the annular projection 4B is fitted into the inner circumferential uneven portion 5A, whereby the first tube 11W and the second tube 11Z Can be set in a state where a predetermined angle is provided around the axis Y.

  An example of how to set the relative angle will be described. The angle setting step of giving the tube 11 and the welded joint 4 a predetermined relative angle with respect to the axis Y is included in the above-described loading step. Here, as an example of the predetermined relative angle θ, the first tube 11W and the second tube 11Z are connected to each other with a relative angle of 45 degrees.

  First, in the loading process related to the L-shaped bent first tube 11W and the welding joint 4, as shown in FIG. 7, the horizontal position of the jig 28 placed on the clamp (not shown) side of the welding apparatus A is shown. The first tube 11W is placed on the placement surface 28a, and any notch 22 and the engaging protrusion 23 are fitted. Then, the first angle setting step is performed by gripping the upper structure 1J while swinging downward. As a result, the axial center Y of the welded joint 4 and the bent portion axial center w of the first tube 11W are an integer of 45 degrees in the axial Y direction when the engaging protrusion 23 in that state is used as a reference. It is welded and integrated with a double angle (0 degrees, 45 degrees, 90 degrees, 135 degrees, etc.).

  Next, in the loading process regarding the welded joint 4 and the second tube 11Z in which the first tube 11W is integrated, an operation is performed as shown in FIG. That is, the welding joint 4 with the first tube is turned over, and the first tube 11W is disposed on the opposite side with respect to the welding apparatus A from the first loading step. Note that the notch 22 used as the relative angle determining mechanism E in the first loading process is shown as a notch 22A for convenience. Then, the tube end 11A of the second tube 11Z is fitted to the tube end 4A opposite to the tube end 4A used in the first loading step.

  Next, the outer peripheral flange 21 is inserted into the annular peripheral groove 18 while the first tube 11W is inclined at about 45 degrees with respect to the axis Y, and the notch 22 that fits into the engaging protrusion 23 is searched for and fitted in that position. The annular protrusion 4B is fitted into the inner circumferential uneven portion 5A. At the same time, the second angle setting step is performed by placing the second tube 11Z on the placement surface 28a of the jig 28 and then holding the upper structure 1J while swinging downward. Since the bent tube axis z of the second tube 11Z placed on the jig 28 is in the horizontal direction, the first tube 11W and the second tube 11Z have a bent tube axis w and a bent tube axis z. They are welded and integrated through the welded joint 4 with a relative angle θ (= 45 degrees). If the notch 22 used as the relative angle determining mechanism E in the second loading step is referred to as a rear notch 22B for convenience, the front notch 22A and the rear notch 22B are the eight notches 22. Are two adjacent cutouts.

  That is, the heat generating portion 7 surrounding the joint portion s formed by fitting the tube end portion 4 </ b> A of the synthetic resin welded joint 4 and the tube end portion 11 </ b> A of the synthetic resin tube 11, and the welded joint 4 are surrounded. The joint portion s is heated and melted by the heat generated by the heat generating portion 7 in a clamped state where the weld joint 4 is gripped by the clamp portion 5 and the tube end portion 4A. In the welding method of welding the tube end portion 4A and the tube end portion 11A using the welding apparatus A capable of being welded to the tube end portion 11A, the inner peripheral uneven portion 5A is provided on the inner peripheral portion of the clamp portion 5 and The outer peripheral portion 4B is provided on the outer peripheral portion of the weld joint 4, and in the clamped state, the inner peripheral uneven portion 5A and the outer peripheral uneven portion 4B are fitted to each other to weld the pipe end portion 4A around the axis Y. Determining the relative angular position of the joint 4 and the clamp part 5; Cormorant is a welding method.

  Thus, the welding joint 4 is welded in a state in which the notch 22 and the engaging protrusion 23 are fitted by setting the first and second tubes 11W and 11Z in the same posture at the time of welding by providing the jig 28 or the like. The first tube 11 </ b> W and the second tube 11 </ b> Z can be welded and integrated with a predetermined relative angle by simply loading the device 1, holding it, and welding it. This eliminates the troublesome and troublesome work of measuring the relative angle as in the prior art, and is capable of setting an accurate relative angle regardless of who is performing, the excellent welding joint 4, the welding apparatus A, and the welding method. Can be realized.

[Another Example]
(1) For example, a state where a slit for construction along the tube axis is provided at the tip and the directional straight tubular first tube 11W and the elbow-shaped second tube 11Z are provided with a predetermined relative angle θ. Even when the welding joint 4 is used for welding integration, the welding joint 4, the welding apparatus A, and the welding method according to the present invention can be used.

(2) The weld joint 4 may be one shown in FIGS. 9 (a) to 9 (c). What is shown to Fig.9 (a) is the welding joint 4 for outer diameter uneven | corrugated | grooved parts 4B of two places large and small for pipes of different diameter suitable for the connection of the tubes from which diameters mutually differ. What is shown in FIG.9 (b) is the welding joint 4 which has the elbow shape which has an axial center which differs 90 degree | times, and has the two outer periphery uneven | corrugated | grooved parts 4B. What is shown in FIG. 9C is a cheese-shaped welded joint 4 that branches at an angle of 90 degrees and has three pipe end portions 4A and three outer peripheral uneven portions 4B.

(3) As the notch 22 of the outer periphery uneven | corrugated | grooved part 4B, what is shown to Fig.10 (a)-(d) may be sufficient. What is shown in FIG. 10A is the arc-shaped notch (arc groove) 22 described above. What is shown in FIG. 10B is a rectangular cutout (square groove) 22 having a rectangular shape when viewed in the axis Y direction. What is shown in FIG. 10C is a trapezoidal notch (trapezoidal groove) 22 that has a trapezoidal shape with the shape of the axial center view in the Y direction expanding outward. What is shown in FIG. 10 (d) is a triangular notch (triangular groove) 22 in which the shape of the axial center view in the Y direction is an outwardly expanding triangle.

(4) As the above-mentioned engagement protrusion 22 formed in the outer periphery uneven | corrugated | grooved part 4B, what is shown to Fig.11 (a)-(d) may be sufficient. What is shown in FIG. 11A is an engaging projection (arc-convex) 22 formed in a projection having a bowl shape (arc-shaped) as viewed in the axial direction Y. What is shown in FIG. 11B is a rectangular engaging protrusion (square convex) 22 having a rectangular shape when viewed from the axial center Y direction. What is shown in FIG. 11C is a trapezoidal engagement protrusion (trapezoidal protrusion) 22 that has a trapezoidal shape that is narrowed in the direction of the axial center Y direction. What is shown in FIG. 11 (d) is a triangular engagement protrusion (triangular protrusion) 22, which is a triangle whose outer shape narrows when viewed from the axial center Y direction.

(5) The number of the notches 22 in the outer circumferential uneven portion 4B, that is, the predetermined angle θ may be as shown in FIGS. 12 (a) to 12 (c). The structure shown in FIG. 12A is a structure in which the notches 22 are formed at a total of four positions every 90 degrees with respect to the axis Y (every 90 degrees). The structure shown in FIG. 12B is a structure in which notches 22 are formed at a total of eight positions every 45 degrees with respect to the axis Y as in the above-described embodiment (every 45 degrees). The structure shown in FIG. 12C is a structure in which the notches 22 are formed at a total of 12 positions every 30 degrees with respect to the axis Y (every 30 degrees).

(6) The relative angle determining mechanism E in the case where the engagement protrusion 22 as shown in FIGS. 11A to 11D is formed on the outer circumferential uneven portion 4B can have the structure shown in FIG. That is, the diameter of the annular circumferential groove 18 is set to a diameter connecting the tops of the respective engagement protrusions 22, and the pair of small protrusions 23 a and 23 a are formed in the annular circumferential groove so as to form the engagement recesses 23 that engage with the engagement protrusions 22. 18 is integrally formed.

4 welded joint 4A pipe end 4B outer peripheral uneven part 4C joint main body part 5 clamp part 5A inner peripheral uneven part 7 heat generating part 11 tube 11A tube end part 18 annular peripheral groove 21 outer peripheral flange 22 notch 23 engaging protrusion A welding apparatus Y axis center s joint

Claims (6)

It has a joint body part that is enclosed and gripped by the clamp part of the welding apparatus, and a pipe end part that can be fitted to the tube end part of the synthetic resin tube, and the tube end part and the pipe end part To the welding apparatus in a clamped state in which the pipe end is surrounded by the heat generating part of the welding apparatus and the joint body part is surrounded and gripped by the clamp part in order to heat and melt the joint portion formed by fitting. A synthetic resin welded joint that is configured to be wearable,
The joint body portion is provided with an outer peripheral uneven portion that fits into an inner peripheral uneven portion formed on the inner peripheral portion of the clamp portion, and when the clamp body is in the clamped state, the inner peripheral uneven portion and the outer peripheral uneven portion. Are welded joints configured such that the angular position of the joint body portion with respect to the clamp portion around the axis of the tube end portion is determined.   An outer peripheral flange that fits in an annular circumferential groove formed in the welding apparatus in a state where the outer peripheral uneven portion has a engaging protrusion that extends in a radial direction with respect to the shaft center, and is to be fitted to the engaging protrusion. The welded joint according to claim 1, comprising a notch provided in the outer peripheral flange. A heat generating portion that surrounds a joint portion formed by fitting a tube end portion of a synthetic resin weld joint and a tube end portion of a synthetic resin tube, and a clamp portion that can be gripped by surrounding the weld joint The welded portion is heated and melted by the heat generated by the heat generating portion in a clamped state where the welded joint is gripped by the clamp portion, and the tube end portion and the tube end portion can be welded. A resin pipe welding apparatus configured as follows:
The clamp portion is provided with an inner peripheral uneven portion that fits into an outer peripheral uneven portion formed on the outer peripheral portion of the weld joint, and when in the clamped state, the outer peripheral uneven portion and the inner peripheral uneven portion are A welding apparatus configured to be fitted to determine an angular position of the clamp portion with respect to the weld joint around the axis of the pipe end portion.   An annular circumferential groove that fits around an outer peripheral flange formed on the welded joint in a state where the inner circumferential uneven portion has a notch extending in a radial direction with respect to the shaft center, and the annular circumferential groove to be fitted into the notch. The welding apparatus according to claim 3, wherein the welding apparatus is configured with an engaging protrusion provided in the groove. A heat generating portion that surrounds a joint portion formed by fitting a tube end portion of a synthetic resin weld joint and a tube end portion of a synthetic resin tube, and a clamp portion that can be gripped by surrounding the weld joint The welded portion is heated and melted by the heat generated by the heat generating portion in a clamped state where the welded joint is gripped by the clamp portion, and the tube end portion and the tube end portion can be welded. A welding method for welding the tube end and the tube end using a welding device,
An inner peripheral uneven portion is provided on the inner peripheral portion of the clamp portion, and an uneven outer peripheral portion is provided on the outer peripheral portion of the welded joint, and the inner peripheral uneven portion and the outer peripheral uneven portion are provided in the clamped state. A welding method for fitting and determining a relative angular position between the weld joint and the clamp portion around the axis of the pipe end.   As the outer peripheral uneven portion, an outer peripheral flange formed with a notch extending in the radial direction with respect to the shaft center is used, and as the inner peripheral uneven portion, an engaging protrusion that fits into the notch is provided. The welding method according to claim 5, wherein an annular circumferential groove that can be fitted onto the outer peripheral flange is used.

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