JP2023056104A - Elbow piping rotation welding fixture - Google Patents

Abstract

To provide an elbow piping rotation welding fixture that can be easily attached to a pipe rotation processing device, whose welding posture at the time of rotation welding is not an upward facing posture, thereby facilitating work of rotation welding of a pipe end to be welded, and that contributes improvement in welding quality.SOLUTION: An elbow piping rotation welding fixture includes: an elbow receiver on which a 90-degree corner of a 90-degree elbow to be processed is placed; a flat bar welded, fixed, and arranged in rear of the elbow receiver and including an opening for a U-bolt sandwiching the 90-degree elbow to be processed that has been placed on the elbow receiver; two pipes for setting welded, fixed, and arranged in rear of the flat bar and arranged so as to be coaxially orthogonal to center axes of openings of both ends of the 90-degree elbow to be processed; and a tightening nut inserted to the U-bolt sandwiching the 90-degree elbow to be processed from upward and the opening for the U-bolt, for tightening both ends of the U-bolt.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to an elbow pipe rotary welding fixture that enables easy rotary welding of the end of a straight pipe to the end of a 90-degree elbow.

For example, Japanese Patent Laid-Open No. 1-273672 discloses a rotating device used for welding pipes to both ends of this type of 90-degree elbow. The disclosure of Japanese Patent Application Laid-Open No. 1-273672 relates to the invention entitled "Welding Rotating Device for 90° Elbows" and states that "Both ends of the elbow can be welded by simply mounting the elbow once, and elbows with different diameters can be welded together. In the problem to be solved by the invention (see page 2, upper right column, line 18 to line 1, lower left column), "a rotating shaft and a tip of this rotating shaft , a tilting base provided at an angle of 45 degrees with respect to the core line, a rotating base having a central axis passing through the tilting base and capable of rotating on the tilting base, and a rotating base formed at the tip of the central shaft. A female screw body that can be screwed into a male screw to tighten the rotary table to the inclined table, and a female screw provided on the peripheral edge of the inclined table, the tip of which presses and fixes the rotary table. A locking male screw, a chain capable of tightening and fixing a 90° elbow on the rotating base, and a chain provided on the rotating base, which is brought into contact with the 90° elbow and rotates the rotating base. , and a support member that supports so that the center of each end face circle of the 90° elbow and the core line of the rotating shaft can be aligned (see claim 1 of the same publication).・After a 90° elbow is mounted on a rotating base and one end face circle portion is welded, the other end face circle can be welded without removing and attaching the elbow by rotating the rotating base. This makes the work more efficient, and since the end face circle does not rotate eccentrically at this time, the work is easy and the finish quality is good." See page 3, lower right column, lines 8 to 14 of the publication).

FIG. 5 is a front view of an embodiment of the invention disclosed in Japanese Patent Application Laid-Open No. 1-273672, which is shown in FIG. 1. In FIG. 132 is a tilting base, 133 is a turning base, 134 is a center shaft, 135 is a male screw, 136 is a handle, 137 is a female screw body, 138 is a female screw, and 139 is a , set male screw, 140, abutment, 141, chain, 143, male screw, 145, nut, 146, receiving member, 148, 90° elbow, 153, 154, pipe (straight pipe) , 155 and 157 are end face circles, and 156 is a welding rod (the reference numerals have been changed to three digits by the applicant to clarify that they are prior art).

However, the 90° elbow welding rotation device 130 shown in FIG. 5 is used for the rotation welding of the pipes 153 and 154 to the pipe 154 at the other end after the rotation welding of the pipes 153 and 154 to the elbow 148 is completed. In order to carry out rotary welding to the pipe 154 at the other end, after all, the center axis 134 of the device must be adjusted so that rotary welding can be performed with the pipe 154 to the other end as the center of the rotary shaft 131. Extra work was required, such as having to rotate 180 degrees and reinstall. In addition, since the chain 141 and the receiving member 146 serve as receiving materials for the elbow 148, there is a risk that the elbow 148 will be damaged, and furthermore, there is a risk that the elbow 148 will not be firmly fixed and will slip from the set jig during rotation. be.

Therefore, the applicant company uses a device called a positioner that can rotate the pipe to be treated while maintaining it at an appropriate angle. By fixing one end of the pipe, the pipe (straight pipe) was welded to both ends of the elbow in the manufacture of a single piece of pipe.

FIG. 6 is a diagram showing an outline of welding a pipe (straight pipe) to both ends of an elbow in the manufacture of a single pipe using a positioner. In FIG. 6, 160 is a positioner, 161 is a table, and 162 A pipe (straight pipe) fixed to the table 161, 163 is an elbow, 164 is a pipe (straight pipe) welded to the other end of the elbow 163, and 165 is a welding rod.

However, rotary welding to pipe (straight pipe) on both ends of the elbow using the positioner 160 shown in FIG. There was a drawback that after the installation and setting (fixing) of the temporary pipe (not shown) on the table 161, rotary welding had to be performed.

That is, if the pipe 162 is set directly on the positioner 160, welding of the end of the elbow 163 becomes difficult because the distance between the positioner 160 and the pipe 164 on the opposite side is narrow. Moreover, when a temporary pipe (not shown) is used, it is necessary to remove the temporary pipe after welding.

Also, FIG. 7 is a schematic diagram of welding a pipe (straight pipe) to both ends of an elbow in manufacturing a single pipe using a device called a pipe roller instead of a positioner. 171 is a pipe rotation fixing portion; 172 is a pipe to be welded (straight pipe) fixed to the pipe rotation fixing portion 171; 173 is an elbow; and 174 is welded to the other end of the elbow 173. It is a pipe to be welded (straight pipe).

Rotary welding of a pipe (straight pipe) to both ends of an elbow using pipe rollers 170 shown in FIG. , the temporary pipe (not shown) must be set (fixed) to the pipe rotation fixing portion 171 and rotary welded, and there are similar problems such as separate repair work for the removed portion.

JP-A-1-273672

Therefore, in order to solve the above-mentioned drawbacks or problems, the inventors of the present application have proposed a positioner for rotating pipe processing equipment and a pipe rotation fixing part of a pipe roller in elbow pipe single-rotation welding using a positioner and a pipe roller. To devise an elbow pipe rotary welding fixing jig that can be easily attached, does not raise the welding posture during rotary welding, facilitates rotary welding work at the end of the pipe to be welded, and contributes to the improvement of welding quality. It is an object of the present invention to provide the elbow pipe rotary welding fixing jig.

The invention according to claim 1 of the present application is a fixing jig that can be easily attached to a rotary fixed portion of a positioner or a pipe roller, which is a device for rotary processing of a pipe, and a 90-degree corner of a 90-degree elbow to be processed is mounted. a flat bar that is welded and fixed behind the elbow receiver and has a U-bolt opening that sandwiches the 90-degree elbow to be treated placed on the elbow receiver; and a workpiece that is welded and fixed behind the flat bar Two setting pipes arranged orthogonally and coaxially with the central axis of the openings on both ends of the 90-degree elbow to be processed, a U-bolt that sandwiches the 90-degree elbow to be processed from above, and a U-bolt that is inserted through the opening for the U-bolt. and a tightening nut for tightening both ends.
Further, the invention according to claim 2 of the present application is the elbow pipe rotary welding fixture according to claim 1, wherein both ends of the elbow receiver are cut off at an angle of 60 degrees with respect to the 90-degree center of the elbow, and cut off. It is characterized by a shape in which the inside of the elbow is notched and only the outside part is left.
Furthermore, the invention according to claim 3 of the present application is the elbow pipe rotation welding fixture according to claim 2, wherein the elbow pipe rotation welding fixture is provided on the elbow receiver at an angle of 60 degrees with respect to the center of 90 degrees with the inner diameter of the elbow receiver as the outer diameter. and a packing material having a shape in which both ends are cut off at the end of the elbow, and the inner side of the cut off elbow is notched, leaving only the outer portion.
The invention according to claim 4 of the present application is the elbow pipe rotation welding fixing jig according to claim 3, wherein a packing material in which a plurality of packing materials having an outer diameter equal to the inner diameter of the packing material arranged below is stacked, characterized by having

The following effects can be obtained by using the elbow pipe rotation welding fixing jig for the positioner.
(1) The downward position is advantageous for welding along the circumference of the pipe, and by setting the positioner or pipe roller, it is possible to weld in the same direction while rotating the pipe.
(2) In addition, the use of a fixing jig has the effect of reducing deformation of the pipe due to the positioner or pipe roller, rust caused by dissimilar metals, and distortion of the pipe and elbow.
(3) In addition, there is no concern about damage to the elbow body due to the fixing jig or the influence of dust such as spatter during welding.
(4) An elbow angle of 70° or more can be accommodated, and by using a corresponding jig, it can be widely used as long as it has a rotating shaft.

FIG. 1 is a schematic diagram showing Example 1 of the elbow pipe rotary welding fixture according to the present invention. FIG. 2 is an exploded view showing an outline of setting the elbow pipe rotary welding fixture 1 according to the first embodiment to a positioner. FIG. 3 is a diagram schematically showing rotary welding of the other pipe 164 to the other end of the elbow to be processed 163 using the elbow pipe rotary welding fixture 1 according to the first embodiment. FIG. 4 shows an outline of welding a pipe (straight pipe) to the elbow end in manufacturing a single piece of pipe by fixing the elbow pipe rotary welding fixing jig 1 according to the first embodiment to a pipe roller 170 instead of the positioner 160 . FIG. 4 is a diagram showing; FIG. 5 is a front view of an embodiment of the invention disclosed in Japanese Unexamined Patent Publication No. 1-273672 shown as FIG. 1 in the same publication. FIG. 6 is a schematic diagram of welding pipes (straight pipes) to both ends of an elbow in the manufacture of a single piece of pipe using a positioner. FIG. 7 is a schematic diagram of welding a pipe (straight pipe) to both ends of an elbow in the manufacture of a single piece of pipe using a device called a pipe roller instead of a positioner.

An embodiment for carrying out the elbow pipe rotary welding fixture according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing Example 1 of the elbow pipe rotary welding fixture according to the present invention. In FIG. 1, reference numeral 1 is an elbow pipe rotation welding fixture according to the first embodiment of the present invention, 2 is one setting pipe, 3 is the other setting pipe, 4 is an elbow receiver, and 5 is , flat bars, 6a and 6b are brackets (the bracket 6b is not shown), 7 is a U bolt, and 8a and 8b are tightening nuts for the U bolt 7.

As shown in FIG. 1, an elbow pipe rotary welding fixture 1 according to the first embodiment has an elbow receiver 4 for mounting and fixing a 90-degree corner portion of an elbow (not shown in FIG. 1), The elbow receiver 4 is fixed at 90 degrees to the flat bar 5 under the elbow receiver 4 via both brackets 6a and 6b so that the vertical center axis is parallel to the respective center axes of the pipes 2 and 3 for both sets. be.

Furthermore, the setting pipes 2 and 3 fixed to the rotary fixed portion of the pipe rotary processing device such as a positioner are orthogonally joined to the flat bar 5 behind the elbow receiver 4. The central axis is formed on both ends of the elbow (not shown in FIG. 1).

In addition, in the elbow pipe rotation welding fixture 1 according to the first embodiment, the elbow receiver 4 is provided with a 90 degree elbow of the same diameter or a slightly larger diameter for convenience in fixing the elbow (not shown). Both ends are cut off at an angle of 60 degrees with respect to the center of degrees, and the inner side of the cut off elbow 163 is notched, leaving only the outer portion. By cutting off both ends at an angle of 60 degrees, the 90-degree elbow placed thereon is firmly fixed to the elbow receiver 4 . Also, the U-bolt 7 used has a U-bolt diameter that matches the outer diameter of the 90-degree elbow to be mounted.

That is, the elbow pipe rotary welding fixture 1 according to the first embodiment formed as described above is a fixture that is used by being fixed to the rotation fixing portion of a positioner or a pipe roller, which is a machine for rotary processing of pipes. As shown in FIG. 1, an elbow receiver on which the 90-degree corner of the 90-degree elbow to be processed is placed, and a workpiece 90 to be processed 90 which is welded and fixed behind the elbow receiver and placed on the elbow receiver. A flat bar with a U-bolt opening that sandwiches a 90-degree elbow, and two sets of 90-degree elbows to be processed that are welded and fixed behind the flat bar and arranged orthogonally and coaxially with the center axis of both end openings. and a U-bolt that sandwiches the 90-degree elbow to be processed from above and a tightening nut that tightens both ends of the U-bolt inserted through the opening for the U-bolt.

Next, an outline of welding a pipe to both ends of an elbow to be processed by attaching the elbow pipe rotary welding fixture 1 according to the first embodiment to a positioner, which is a pipe rotary processing device, will be described with reference to the drawings.

FIG. 2 is an exploded view showing the outline of setting the elbow pipe rotary welding fixture 1 according to the first embodiment to a positioner. In FIG. Identical members shown in FIGS. 1 and 6 are denoted by the same reference numerals.

As shown in FIG. 2, the 90-degree elbow 163 is placed on the elbow receiver 4, the U-bolt 7 is inserted from above, and the flat bar 5 is fixed with the tightening nut 8 from behind. The setting pipe 2 of the elbow pipe rotary welding fixing jig 1 is fixed to the table 161 of the positioner 160 . One end of the elbow 163 and the pipe 162 are welded while rotating the elbow pipe rotary welding fixture 1 according to the first embodiment fixed to the table 161 of the positioner 160 by the table 161 .

After the rotation welding of one end of the elbow 163 and the pipe 162 is completed, the setting pipe 2 is removed from the table of the positioner 160, the other setting pipe 3 is attached and fixed to the table, and the other end of the elbow 163 and the other end are welded together. and the pipe 164 of the rotary weld.

FIG. 3 is a diagram schematically showing rotary welding of the other pipe 164 to the other end of the elbow 163 to be processed using the elbow pipe rotary welding fixture 1 according to the first embodiment, which is different from FIG. The only point is that the other setting pipe 3 is fixed to the table 161 of the positioner 160. By fixing the other setting pipe 3 to the table 161 of the positioner 160 and rotating the table 161, the elbow The other end of 163 and the other pipe 164 are rotary welded.

3, reference numeral 165 denotes the welding rod shown in FIG. 6, and the rest of the reference numerals designate the same members shown in FIGS. 1, 2 and 6 with the same reference numerals.

FIG. 4 shows an outline of welding a pipe (straight pipe) to the elbow end in manufacturing a single piece of pipe by fixing the elbow pipe rotary welding fixing jig 1 according to the first embodiment to a pipe roller 170 instead of the positioner 160 . After the rotary welding of the pipe 172 to the elbow 173 is completed, the pipe 3 for setting the elbow pipe rotary welding fixing jig 1 according to the first embodiment is attached to the pipe roller 170 to the pipe rotary fixing portion 171. It shows a schematic of fixing and rotary welding the other pipe 174 to the other end of the elbow 173 . In FIG. 4 as well, the same members shown in FIGS. 1 and 7 are denoted by the same reference numerals.

As shown in FIGS. 2 to 4, when the pipes 162, 172 and the pipes 164, 174 are welded to both ends of the 90-degree elbows 163, 173, the elbow pipe rotation welding according to the first embodiment is fixed to the elbows 163, 173. The jig 1 is placed and fixed, and the pipe 2 for setting the elbow pipe rotary welding fixture 1 according to the first embodiment is set on the positioner 160 or the pipe roller 170 . After that, while rotating the table 161 of the positioner 160 or the pipe rotation fixing part 171 of the pipe roller 170, the pipes 162, 172 are rotationally welded to the elbows 163, 173, and the welding of the elbows 163, 173 and the pipes 162, 172 is completed. Then, the other setting pipe 3 of the elbow pipe rotary welding fixture 1 according to the first embodiment is set on the positioner 160 or the pipe roller 170, and this time, the other ends of the elbows 163, 173 and the pipes 164, 174 are set. Weld while rotating between (rotational welding).

By doing this kind of work, it is possible to weld both ends of the elbow and the pipe so that they are always welded downward from the worker's point of view. It is possible to avoid situations where defects in weld quality are likely to occur.

That is, by using the elbow pipe rotary welding fixture 1 according to the first embodiment, the following effects can be obtained.

(1) The downward position is advantageous for welding along the circumference of the pipe, and by setting the positioner or pipe roller, it is possible to weld in the same direction while rotating the pipe. (2) In addition, the use of a fixing jig has the effect of reducing deformation of the pipe due to the positioner or pipe roller, rust caused by dissimilar metals, and distortion of the pipe and elbow. (3) In addition, there is no concern about damage to the elbow body due to the fixing jig or the influence of dust such as spatter during welding. (4) An elbow angle of 70° or more can be accommodated, and by using a corresponding jig, it can be widely used as long as it has a rotating shaft.

In the elbow pipe rotation welding fixture 1 according to the first embodiment, as described above, the elbow receiver 4 for mounting and fixing the 90-degree corner portion of the elbow has a vertical center axis that corresponds to the first embodiment. Both sets of pipes 2 and 3 of the elbow pipe rotary welding fixture 1 are fixed to the flat bar 5 via both brackets 6a and 6b so as to overlap the central axes of the two sets of pipes 2 and 3. is joined to the flat bar 5 behind the elbow receiver 4 at a right angle, and the shape of the elbow receiver 4 is, as shown in FIG. Both ends are cut off at an angle of 60 degrees from the center of 90 degrees, and the inner side of the cut off elbow 163 is notched, leaving only the outer portion.

However, both ends are cut off at an angle of 60 degrees based on the 90-degree center of the 90-degree elbow that has the same diameter or a slightly larger diameter than the 90-degree elbow that is used, and the inner side of the cut-off elbow 163 is notched and the outer portion is cut. Elbow receptacle 4 with a chiseled shape cannot be used for elbows with various outer diameters, and elbow pipe rotation welding having elbow receptacles 4 corresponding to the respective diameters cannot be used. A large number of fixtures 1 must be prepared, which is extremely inconvenient.

Therefore, for the 90-degree elbow to be used, both ends are cut off at an angle of 60 degrees based on the 90-degree center of the elbow with the largest outer diameter. In the same way, both ends are cut off at an angle of 60 degrees from the center of 90 degrees, and the inside of the cut off elbow is notched, leaving only the outer part. In other words, by sequentially preparing packing materials for elbows with different outer diameters, it is possible to fix elbows with different outer diameters. That is, assuming that the inner diameter of the elbow receiver 4 of the elbow pipe rotary welding fixture 1 according to the first embodiment is 254.2 mm, the packing has an outer diameter of 253.2 mm and can be firmly interposed inside the elbow receiver 4. By preparing the material, the elbow to be processed is placed on the elbow receiver 4 with the packing material interposed therebetween, and by tightening and fixing the elbow with the U bolt 7 from above, rotation welding of pipes of elbows with different diameters can be performed. It can be done easily. If necessary, the same packing material may be interposed between the U-bolt and the treated elbow.

In addition, when rotary welding an elbow with a smaller diameter to be treated, two or three packing materials with a smaller outer diameter and the same shape can be stacked to create an elbow with a smaller outer diameter. Rotational welding can be easily performed.

INDUSTRIAL APPLICABILITY The present invention is used for an elbow pipe rotary welding fixture that enables easy rotary welding of the end of a straight pipe to the end of a 90-degree elbow.

1 Elbow pipe rotary welding fixing jig 2, 3 Set pipe 4 Elbow receiver 5 Flat bar 6, 6a, 6b Bracket 7 U bolt 8, 8a, 8b Tightening nut 130 Welding rotating device 131 for 90° elbow 132 Rotating shaft 132 Inclined table 133 Rotating table 134 Central shaft 135 Male screw 136 Handle 137 Female screw body 138 Female screw 139 Male set screw 140 Contact portion 141 Chain 143 Male screw 145 Nuts 146, 146 Receiving member 148 90° elbows 153, 154 Pipe (straight tube)
155, 157 End face circle 156 Welding rod 160 Positioner 161 Table 162 Pipe fixed to table 161 (straight pipe)
163 Elbow 164 Pipe welded to the other end of elbow 163 (straight pipe)
165 Welding rod 170 Pipe roller 171 Pipe rotation fixing part 172 Pipe to be welded (straight pipe) fixed to pipe rotation fixing part 171
173 Elbow 174 Pipe to be welded (straight pipe) to be welded to the other end of elbow 173

The invention according to claim 1 of the present application is an elbow pipe rotary welding fixture, which is a fixing jig attached to a rotation fixing part of a positioner or a pipe roller that is a device for rotary processing of a pipe, and is a fixing jig that is attached to a rotation fixing part of a pipe roller. A 90-degree corner is placed, and both ends are cut off at an angle of 60 degrees based on the 90-degree center of the elbow. a packing material having a shape in which both ends are cut off at an angle of 60 degrees with respect to the center of 90 degrees with the inner diameter being the outer diameter, the inner side of the cut off elbow is notched, and only the outer portion is left; A flat bar that is welded and fixed behind the elbow receiver and has a U-bolt opening that sandwiches the 90-degree elbow to be processed that is placed on the elbow receiver, and a 90-degree elbow that is welded and fixed to the rear of the flat bar. Two set pipes arranged orthogonally and coaxially with the central axis of the openings on both ends, a U bolt that sandwiches the 90-degree elbow to be processed from above, and a U bolt that is inserted through the openings for U bolts Tightening that tightens both ends and a nut, wherein the longitudinal central axis of the elbow receiver is fixed at 90 degrees to the flat bar below the elbow receiver in parallel with the respective central axes of the pipes for both sets at 90 degrees. and
Further, the invention according to claim 2 of the present application is the elbow pipe rotary welding fixture according to claim 1 , wherein a plurality of packing materials having an outer diameter equal to the inner diameter of the packing material arranged under the 90-degree elbow used are provided. and a stacked packing material.

Claims (4)

A fixing jig that can be easily attached to the rotation fixing part of a positioner or a pipe roller, which is a device for rotary processing of pipes,
an elbow receiver on which the 90-degree corner of the 90-degree elbow to be processed is placed;
a flat bar welded and fixed behind the elbow receiver and having a U-bolt opening for sandwiching the 90-degree elbow to be processed placed on the elbow receiver;
two setting pipes arranged orthogonally and coaxially with the central axis of both end openings of the 90-degree elbow to be processed, which is welded and fixed behind the flat bar;
a tightening nut that tightens both ends of the U bolt that sandwiches the 90-degree elbow to be processed from above and the U bolt that is inserted through the opening for the U bolt;
An elbow pipe rotation welding fixture, characterized by comprising: 2. The elbow receiver has a shape in which both ends are cut off at an angle of 60 degrees with respect to the 90-degree center of the elbow, and the inner side of the cut off elbow is notched, leaving only the outer portion. Elbow pipe rotation welding fixture. a packing material having a shape in which both ends are cut off on the elbow receiver at an angle of 60 degrees with respect to the center of 90 degrees with the inner diameter of the elbow receiver as the outer diameter, and the inner side of the cut off elbow is notched to leave only the outer part;
The elbow pipe rotary welding fixture according to claim 2, characterized by having: a packing material in which a plurality of packing materials having an outer diameter equal to the inner diameter of the lower packing material are stacked;
4. The elbow pipe rotary welding fixture according to claim 3, characterized by comprising:

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