JP4737739B2 - Piping butt welding positioning jig - Google Patents

Description

  In the present invention, when butt welding a pipe such as a stainless steel pipe (including welding of a pipe and a joint or welding of a joint and a joint), the pipe that can easily butt and position the pipe The present invention relates to a butt welding positioning jig.

JP, 2001-287090, A Conventionally, when two metal members (hereinafter, referred to as "welded members") are butt welded, a welding machine having a welding processing portion between a pair of holders spaced apart from each other The one welded member is held by one holder and the butt end face of the one welded member is positioned with respect to the welding processing portion, and then the other welded member is held by the other holder. After the end face of the other member to be welded is brought into contact with the butted end face of the member, the welding process is performed.

  Further, when performing such butt welding, there is known one using a reference member for positioning one member to be welded to one holder by a welding processing portion (for example, see Patent Document 1). .

  The method related to the reference positioning in the butt welding disclosed in Patent Document 1 projects upward from the upper surface of the table prior to the butt welding in which the end surfaces of the plate members placed on the upper surface of the table forming the horizontal surface are welded together. In this state, an end surface of one plate material is brought into contact with the end surface of the plate material, and a reference plate configured to retract downward from the upper surface of the table during welding is provided.

  Specifically, for the first table on which one plate material is placed, the second table on which the other plate material to be butt-welded with this plate material is divided so as to be able to contact and separate, and the end surface of one plate material When the positioning is performed, the reference plate is projected upward from the upper surface of the first table in a state where the second table is separated from the first table, and the positioning work of the end surface of one plate material is performed. After completion, the reference plate is retracted downward from the upper surface of the first table, the second table is moved toward the first table, and the end surface of the reference plate is in contact with the end surface of the first table and retracted. The space above the plate is closed.

  By the way, the butt welding positioning jig configured as described above is intended for a large plate material, the reference plate is also large, and requires a movable space for the reference plate to move up and down. It was a thing.

  Therefore, if the welded material is relatively small (the welded area is small), such as butt welding of piping, the welding machine itself is small, so a lifting reference plate for positioning is installed. There was a problem that there was no space to do.

  Therefore, it is conceivable to position the pipe H by placing the key-shaped reference plate 1 as shown in FIG. 6A on the pipe fixing cassette 2 as shown in FIG. 6B.

  The pipe fixing cassette 2 includes a pair of holders 3 and 4 that are separated from each other, and a base 5 that holds the holders 3 and 4 so as to maintain the distance between the holders 3 and 4.

  The holders 3 and 4 are divided in half into the fixed portions 3a and 4a and the movable portions 3b and 4b so as to sandwich the pipe H, and the end surfaces of the fixed portions 3a and 4a and the movable portions 3b and 4b are opposed to each other. Are provided with semicircular clamping parts 6a, 6b and 7a, 7b. Each of the holders 3 and 4 is provided with a lock member 8 at the movable portions 3b and 4b, and a claw tip 8a of the lock member 8 is engaged with engagement recesses 3c and 4c formed in the fixed portions 3a and 4a. Thus, the combined state, that is, the fixed state of the pipe H is maintained.

  In such a configuration, when performing butt welding of the pipe H, as shown in FIG. 7A, the holders 3 and 4 are opened, and for example, the pipe H is set in one holder 3 first. In this case, the reference plate 1 is placed on the fixing portion 4a of the other holder 4 as shown in FIG.

  From this state, the pipe H is arranged in the holding part 6a of one holder 3, and the tip of the pipe H is abutted against the reference plate 1, and as shown in FIG. 7C, the holding part 6b on the movable part 4b side After the movable part 3b is rotated so as to sandwich the pipe H with the cooperation, the claw tip 8a of the lock member 8 is engaged with the engaging recess 3c to fix the pipe H.

  Next, after removing the reference plate 1 from the other holder 4, the pipe H is arranged in the holding portion 8a of the holder 4, and its tip is abutted against the tip of the pipe H on the holder 3 side, and FIG. ), After the movable portion 4b is rotated so as to clamp the pipe H in cooperation with the holding portion 8b on the movable portion 4b side, the claw tip 8a of the lock member 8 is engaged with the engaging recess 4c. Combine and fix the pipe H.

  When the butting of each pipe H is completed, welding is performed by welding means (manual welding / automatic welding) (not shown).

  However, such a reference plate 1 needs to be supported so that the reference plate 1 does not move during the operation of abutting the tip of the pipe H against the reference plate 1 when one pipe H is fixed to the holder 3 first. In order to support it manually, it is a two-handed operation in combination with the fixing operation of the pipe H, and in order to support mechanically, a supporting robot or the like separate from the pipe fixing cassette 2 is required.

  Therefore, when a mechanical support mechanism is employed, there is no difference from the elevating reference plate disclosed in Patent Document 1 described above, resulting in a complicated mechanical configuration.

  In addition, when the work environment is poor, such as when supporting manually, when the pipe fixing cassette 2 is in an inclined state, or when the pipe H is pulled out in an inclined state, such as at the construction site of the pipe H. Therefore, there is a problem that the reference plate 1 must be supported more reliably and workability becomes more complicated.

  In order to solve the above problems, the present invention provides a positioning jig for butt welding of pipes, which has a simple configuration and can easily determine the abutting position at the time of pipe setting regardless of the work environment. With the goal.

In order to achieve the object, the positioning jig for pipe butt welding of the present invention is:
A pipe butt welding positioning jig attached to a pipe fixing cassette that holds a pair of pipes in a butted state independently,
Before clamping one pipe with the pipe fixing cassette, the shaft part is clamped in the same state as the other pipe is clamped with the pipe fixing cassette, and the shaft part is provided at the tip of the shaft part. A positioning portion set to have a large diameter and a height along the axial direction so as to coincide with a pipe abutting position when the pipe is installed in the pipe fixing cassette,
The positioning portion is provided with a retracting portion that is retracted from the surface thereof,
The retracting portion has a structure that does not come into contact with the end of the pipe after positioning even if the positioning portion is rotated so that the positioning portion is lifted around the portion of the shaft portion supported by the clamping portion of the piping cassette. It is a summary.

The positioning jig for pipe butt welding according to claim 2 is characterized in that a plurality of the shaft portions are provided so as to have different diameters, and the positioning portion is provided for each of the plurality of shaft portions.

The positioning jig for pipe butt welding according to claim 3 is characterized in that the shaft portion is provided with a movable fixing portion that clamps a pipe fixing cassette in cooperation with the positioning portion. .

  In the pipe butt welding positioning jig of the present invention, the shaft portion is clamped in the same state as when one pipe is clamped by the pipe fixing cassette before the other pipe is clamped by the pipe fixing cassette. In addition, a positioning portion that is larger in diameter than the shaft portion and whose height along the axial direction coincides with the pipe abutting position when the pipe is installed in the pipe fixing cassette is the tip of the shaft section. With this configuration, the abutting position at the time of pipe setting can be easily determined regardless of the work environment, though the configuration is simple.

  Next, an example of the positioning jig for pipe butt welding according to the present invention will be described with reference to the drawings.

  1 and 2 show a first embodiment of the positioning jig for pipe butt welding according to the present invention, FIG. 1A is a perspective view of the positioning jig for pipe butt welding, and FIG. 1B is a pipe. FIG. 2 is a perspective view of a pipe fixing cassette in which a positioning jig for butt welding is set. FIG. 2 shows a time series of the pipe fixing cassette until the pipe is set using the positioning jig for butt welding. It is a front view.

  Since the configuration of the pipe fixing cassette is the same as the configuration of the prior art shown in FIG. 6, the same reference numerals are given and description of the configuration is omitted.

  In FIG. 1, a positioning jig 10 for pipe butt welding includes a cylindrical shaft portion 11 and a positioning portion 12 provided integrally at the tip of the shaft portion 11.

  The shaft portion 11 is formed to have substantially the same diameter as the opening diameter formed by the cooperation of the sandwiching portions 7a and 7b, and a chain ring for attaching and detaching operations is provided as necessary. In addition, this chain ring is used also for hooking in the storage place, when the positioning jig 10 for piping butt welding of multiple types (size matched to piping) is provided, for example. Further, when such a plurality of types of positioning jigs 10 for butt welding of pipes are provided, a plurality of types of pipe fixing cassettes 2 are prepared, or the clamping parts 6a and 6b and the clamping parts 7a and 7b are replaced. This is possible.

  The positioning portion 12 is formed to have a larger diameter than the shaft portion 11, and is set so that the height along the axial direction coincides with the pipe abutting position when it is installed in the pipe fixing cassette 2.

  In such a configuration, when performing butt welding of the pipe H, as shown in FIG. 2A, the holders 3 and 4 are opened, and for example, the pipe H is set in one holder 3 first. In this case, as shown in FIG. 2B, the positioning jig 10 for pipe butt welding is set on the fixing portion 4a of the other holder 4.

  That is, after setting the shaft portion 11 to the clamping portion 7a so that the positioning portion 12 is positioned on the one holder 3 side in the opened state of the holder 4, the movable portion 4b is rotated, and the claw tip of the lock member 8 is turned on. 8a is engaged with the engagement recessed part 3c, and the shaft part 11 is fixed by the clamping parts 7a and 7b.

  From this state, the pipe H is arranged in the holding part 6a of one holder 3, and the tip of the pipe H is abutted against the end surface of the positioning part 12, and as shown in FIG. After rotating the movable part 3b so as to sandwich the pipe H in cooperation with 6b, the claw tip 8a of the lock member 8 is engaged with the engaging recess 3c to fix one pipe H.

  Next, the claw tip 8a of the lock member 8 is detached from the engaging recess 3c, the movable portion 4b is rotated, the pipe butt welding positioning jig 10 is removed from the other holder 4, and then the holder 4 is clamped. The pipe H is disposed in the portion 8a, and the tip of the pipe H is abutted against the tip of the pipe H on the holder 3 side. As shown in FIG. 2D, the pipe H is cooperated with the holding portion 8b on the movable portion 4b side. After the movable part 4b is rotated so as to hold the pipe H, the claw tip 8a of the lock member 8 is engaged with the engagement recess 4c to fix the pipe H.

  When the butting of each pipe H is completed, welding is performed by welding means (manual welding / automatic welding) (not shown).

  In this way, once the pipe butt welding positioning jig 10 is fixed to the holder 4, the pipe H is fixed to one of the holders 3, so that the respective operations are independent, and the pipe H fixing work and the pipe butt welding are used. It is not necessary to achieve both the fixing operation of the positioning jig 10 with both hands, and workability is improved.

  Further, since the pipe butt welding positioning jig 10 is fixed to the holder 4, even if the pipe fixing cassette 2 is inclined or the pipe H itself is inclined, the pipe butt welding positioning jig 10 is temporarily attached to the holder 4. After the fixture 10 is fixed, it is not necessary to be involved in the pipe butt welding positioning jig 10 until the fixing of the pipe H to the one holder 3 is completed. Butt fixing can be performed.

  In addition, even when these pipes H are automatically fixed, the configuration (robot or the like) for automatically locking the lock member 8 is used as it is, and the pipe butt welding positioning jig is used. Since a new configuration for fixing 10 is not required, it is possible to contribute to automation of welding.

  FIG. 3 shows a second embodiment of the positioning jig for pipe butt welding according to the present invention.

  The positioning jig 20 for pipe butt welding includes a cylindrical shaft portion 21 and a positioning portion 22 provided integrally at the tip of the shaft portion 21.

  The shaft portion 21 is formed to have substantially the same diameter as the opening diameter formed by the cooperation of the sandwiching portions 7a and 7b.

  The positioning portion 22 is formed to have a larger diameter than the shaft portion 21, and is set so that the height along the axial direction coincides with the pipe abutting position when it is installed in the pipe fixing cassette 2. Further, the positioning portion 22 is formed with a chamfered portion 22a.

  The chamfered portion 22a has a function as a retracting portion that is retracted from a part of the tip (abutting surface) of the pipe H. Thereby, the positioning of one pipe H is completed, and the positioning part 22 is lifted around the part supported by the clamping part 7a of the shaft part 21 in order to remove the positioning jig 20 for pipe butt welding from the holder 4. Even if it is rotated in this way, the trouble that the chamfered portion 22a abuts on the tip of the pipe H after positioning and the pipe H is displaced is prevented. In addition, when butt welding is performed when the pipe H is a stainless steel pipe, when the back shield gas is caused to flow inside the pipe H as an internal pressure adjustment for preventing burning of the welded portion and reducing the unevenness of the welded portion, The back shield gas is not sealed.

  FIG. 4 shows a third embodiment of the positioning jig for pipe butt welding according to the present invention and its modification.

  A positioning jig 30 for pipe butt welding shown in FIG. 4A includes a cylindrical shaft portion 31 and a positioning portion 32 provided integrally at the tip of the shaft portion 31.

  The shaft portion 31 is formed to have substantially the same diameter as the opening diameter formed by the cooperation of the sandwiching portions 7a and 7b.

  The positioning part 32 has a larger diameter than the shaft part 31 and is formed in a semicircular shape in the upper part of the figure, and the height along the axial direction coincides with the pipe abutting position when installed in the pipe fixing cassette 2. It is set to be. Further, the positioning portion 32 is formed with a chamfered portion 32a in accordance with the semicircular shape.

  The chamfered portion 32 a is retracted from a part of the tip (abutting surface) of the pipe H. Thereby, the positioning of one pipe H is completed, and the positioning part 32 is lifted around the part supported by the clamping part 7a of the shaft part 31 in order to remove the positioning jig 30 for pipe butt welding from the holder 4. Even if it is rotated in this way, the problem that the pipe H is displaced due to the chamfered portion 32a coming into contact with the tip of the pipe H after positioning is prevented. In addition, when butt welding is performed when the pipe H is a stainless steel pipe, when the back shield gas is caused to flow inside the pipe H as an internal pressure adjustment for preventing burning of the welded portion and reducing the unevenness of the welded portion, The back shield gas is not sealed.

  The positioning jig 40 for pipe butt welding shown in FIG. 4B includes a columnar shaft portion 41, a positioning portion 42 provided integrally at the tip of the shaft portion 41, and the shaft portion 41. A second shaft portion 43 having a diameter larger than that of the shaft portion 41, and a positioning portion 44 provided integrally at the tip of the shaft portion 43.

  The shaft portion 41 is formed to have substantially the same diameter as the opening diameter formed by the cooperation of the sandwiching portions 7a and 7b.

  The positioning part 42 has a larger diameter than the shaft part 41 and is formed in a semicircular shape in the upper part of the figure, and the height along the axial direction coincides with the pipe abutting position when it is installed in the pipe fixing cassette 2. It is set to be. In addition, the positioning part 42 is formed with a space part 42a in accordance with the semicircular shape.

  The space 42 a is retracted from a part of the tip (abutting surface) of the pipe H. Thereby, the positioning of one pipe H is completed, and the positioning part 42 is lifted around the part supported by the clamping part 7a of the shaft part 41 in order to remove the positioning jig 40 for pipe butt welding from the holder 4. Even if it is rotated in this way, the problem that the space H abuts against the tip of the pipe H after positioning and the pipe H is displaced is prevented. In addition, when butt welding is performed when the pipe H is a stainless steel pipe, when the back shield gas is caused to flow inside the pipe H as an internal pressure adjustment for preventing burning of the welded portion and reducing the unevenness of the welded portion, The back shield gas is not sealed.

  Similarly, the shaft portion 43 is formed to have substantially the same diameter as the opening diameter formed by the cooperation of different types of pipe fixing cassettes 2 or the sandwiching portions 7a and 7b.

  The positioning portion 44 has a larger diameter than the shaft portion 44 and is formed in a semicircular shape in the upper part of the figure, and the height along the axial direction coincides with the pipe abutting position when the pipe fixing cassette 2 is installed. It is set to be. In addition, a space 44a is formed in the positioning portion 44 due to the semicircular shape.

  The space 44 a is retracted from a part of the tip (butting surface) of the pipe H. Thereby, the positioning of one pipe H is completed, and the positioning part 44 is lifted around the part supported by the clamping part 7a of the shaft part 43 in order to remove the positioning jig 40 for pipe butt welding from the holder 4. Even if it is rotated in this way, the problem that the space 44a abuts on the tip of the pipe H after positioning and the pipe H is displaced is prevented. In addition, when butt welding is performed when the pipe H is a stainless steel pipe, when the back shield gas is caused to flow inside the pipe H as an internal pressure adjustment for preventing burning of the welded portion and reducing the unevenness of the welded portion, The back shield gas is not sealed.

  A positioning butt 50 for pipe butt welding shown in FIG. 4C includes a columnar shaft portion 51, a positioning portion 52 provided integrally at the tip of the shaft portion 51, and the shaft portion 51. A second shaft portion 53 having a diameter larger than that of the shaft portion 51, a positioning portion 54 provided integrally at the tip of the shaft portion 53, and a shaft provided so as to be orthogonal to the shaft portions 51, 53. A third shaft portion 55 having a diameter larger than that of the portion 53 and a positioning portion 56 provided integrally at the tip of the shaft portion 55 are provided.

  The substantial functions of the shaft portions 51, 53, 55 and the positioning portions 52, 54, 56 are basically the same except that the diameters of the shaft portions 51, 53, 55 are different.

  And according to such positioning jigs 40 and 50 for pipe butt welding disclosed in FIGS. 4B and 4C, different types of pipe fixing cassettes 2 or holding parts 7a and 7b are different. A single jig can be used.

  FIG. 5 shows a fourth embodiment of the positioning jig for pipe butt welding according to the present invention.

  The pipe butt welding positioning jig 60 includes a cylindrical shaft portion 61, a positioning portion 62 provided integrally at the tip of the shaft portion 61, and a positioning portion 62 that is opposed to the shaft portion 61 and moves forward and backward. The movable part 63 held in a possible manner, the fixed part 64 fixed to the base end of the shaft part 62, and the movable part 63 and the fixed part 64 so as to bias the movable part 63 toward the positioning part 62 side. And a spring 65 interposed therebetween.

  The shaft portion 61 is formed to have substantially the same diameter as the opening diameter formed by the cooperation of the sandwiching portions 7a and 7b.

  The positioning part 62 has a larger diameter than the shaft part 61 and is formed in a semicircular shape in the upper part of the figure, and the height along the axial direction coincides with the pipe abutting position when installed in the pipe fixing cassette 2. It is set to be. Further, the positioning portion 62 is formed with a chamfered portion 62a.

  The chamfered portion 62 a is retracted from a part of the tip (butting surface) of the pipe H. Thus, the positioning of one pipe H is completed, and the positioning part 62 is lifted around the part supported by the clamping part 7a of the shaft part 61 in order to remove the positioning jig 60 for pipe butt welding from the holder 4. Even if it is rotated in this way, the problem that the pipe H is displaced due to the chamfered portion 62a coming into contact with the tip of the pipe H after positioning is prevented. In addition, when butt welding is performed when the pipe H is a stainless steel pipe, when the back shield gas is caused to flow inside the pipe H as an internal pressure adjustment for preventing burning of the welded portion and reducing the unevenness of the welded portion, The back shield gas is not sealed.

  In other words, the pipe H was positioned while flowing a 4 L / min back shield gas from 10 cm upstream of the pipe H having an inner diameter of 4.35 mm for positioning, but the back shield gas of 4 L / min was constantly flowing. It was confirmed that the positioning work was not hindered.

  The movable portion 63 cooperates with the positioning portion 62 to sandwich the sandwiching portion 7a (fixed portion 4a), thereby fixing the positioning jig 60 for pipe butt welding to the holder 4 without using the movable portion 4b. can do. Further, when the positioning jig 60 for pipe butt welding is attached to or detached from the holder 4, an operation piece 63 a that separates the movable portion 63 from the positioning portion 62 against the bias of the spring 65 protrudes from the movable portion 63. Has been.

  Although the fixing structure of the fourth embodiment is disclosed based on the pipe butt welding positioning jig 20 shown in the second embodiment, each pipe butt welding positioning jig shown in the first and third embodiments is disclosed. It can also be applied to tools 10, 30, 40, 50.

1 shows a positioning butt-welding jig for pipe butt welding according to Example 1 of the present invention, (A) is a perspective view of a positioning butt welding for pipe butt-welding, and (B) is a state where a positioning jig for pipe butt-welding is set. It is a perspective view of the cassette for piping fixation of. Similarly, (A) to (D) are front views of a pipe fixing cassette showing a time series until pipes are set using a positioning jig for pipe butt welding. Embodiment 2 of the positioning jig for pipe butt welding of the present invention is shown, (A) is a front view of the positioning jig for pipe butt welding, (B) is a side view of the positioning jig for pipe butt welding, ( C) is a perspective view of a positioning jig for pipe butt welding. Embodiment 3 of the positioning jig for pipe butt welding of the present invention is shown, (A) is a perspective view of the positioning jig for pipe butt welding, and (B) is a positioning jig for pipe butt welding of Modification 1. FIG. 6C is a perspective view of a positioning jig for pipe butt welding according to a second modification. Embodiment 4 of the positioning jig for pipe butt welding of the present invention is shown, (A) is a front view of the positioning jig for pipe butt welding, (B) is a side view of the positioning jig for pipe butt welding, ( C) is a perspective view of a positioning jig for pipe butt welding. 1 shows a conventional positioning jig for pipe butt welding, (A) is a perspective view of a positioning jig for pipe butt welding, and (B) is a pipe fixing cassette in a state where a positioning jig for pipe butt welding is set. It is a perspective view. Similarly, (A) to (D) are front views of a pipe fixing cassette showing a time series until pipes are set using a positioning jig for pipe butt welding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Positioning jig for butt welding of pipe 11 ... Shaft part 12 ... Positioning part

Claims (3)

A pipe butt welding positioning jig attached to a pipe fixing cassette that holds a pair of pipes in a butted state independently,
Before clamping one pipe with the pipe fixing cassette, the shaft part is clamped in the same state as the other pipe is clamped with the pipe fixing cassette, and provided at the tip of the shaft part, A positioning portion set to have a large diameter and a height along the axial direction so as to coincide with a pipe abutting position when the pipe is installed in the pipe fixing cassette,
The positioning portion is provided with a retracting portion that is retracted from the surface thereof,
The retracting portion has a structure that does not come into contact with the end of the pipe after positioning even if the positioning portion is rotated so that the positioning portion is lifted around the portion of the shaft portion supported by the clamping portion of the piping cassette. A positioning jig for butt welding of pipes, characterized by being. The positioning jig for pipe butt welding according to claim 1, wherein a plurality of the shaft portions are provided so as to have different diameters, and the positioning portion is provided for each of the plurality of shaft portions. The positioning for pipe butt welding according to claim 1 or 2, wherein the shaft part is provided with a movable fixing part for holding a pipe fixing cassette in cooperation with the positioning part. jig.

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