JP2688103B2 - Pipe joint welding equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for joining opposite pipes by circumferential welding of a butt joint or a sleeve joint, and particularly, for working environment, the pipes are rotated around the pipe axis. The present invention relates to a pipe joint welding device of a type in which a welding head side is rotated when it cannot be performed.

INDUSTRIAL APPLICABILITY The present invention is used for joining fixed or supported relatively small diameter and long tubes.

[Prior Art] When joining pipes to each other at a construction site, welding may sometimes be necessary because the high-tension bolt connection has insufficient airtightness. Further, if the pipe is long, the pipe end portion is already fixed, or the pipe is wound around a bobbin, if the pipes are joined, it may not be possible to extract the joining device from the joined pipes. Therefore, the joining device is made to have a split structure, and the pipes are assembled to assemble before joining work is started. Then, when the joining work is completed, the joining device is disassembled and removed from the pipe.

Conventional pipe joining devices include a split weld head guide rail that is directly screwed and fixed near the ends of the pipes to be joined. The welding head runs on the welding head guide rail. FIG. 4 shows an example of a conventional pipe circumference welding apparatus. Guide rail that guides the welding head rotating carriage 91
92 and its support 93 are directly attached to the pipes 1 to be joined. As such a pipe joining welding apparatus, for example, Japanese Patent Publication No. 58-8949, Japanese Patent Publication No. 58-280299, and Japanese Patent Laid-Open No. 58-3507.
5, Japanese public examination Sho 59-53147, actual development Sho 58-613669, actual development Sho 59-6288
3. There are devices disclosed in JP-A-59-39479 or JP-A-62-158590.

[Problems to be Solved by the Invention] The above-described conventional pipe welding apparatus is suitable when the outer diameter of the pipe and the size of the welding head are balanced in terms of shape and weight. For large diameter pipes, there is a welding device equipped with a commercially available automatic welding device. For small-diameter pipes with a diameter of about 10 mm, there is a device for joining pipes by TIG welding using a small welding head dedicated for small-diameter pipes. These welding devices can be used when the pipe has sufficient rigidity or strength to support the weight of the welding head, and the torch tip does not shake due to the traveling of the welding head during welding work. Has become.

If there is an excellent welding machine on the market and the welding head can be diverted to the joint welding of pipes, the development period of the welding head can be significantly shortened and the development cost can be greatly reduced. However, when the welding head is heavy compared to the size of the pipe, the conventional method of directly applying the weight of the welding head to the pipe makes the pipe more flexible due to the weight of the welding head.
If the pipe easily bends, the movement of the groove portion and the movement of the tip of the welding torch become relatively irregular, and the welding torch cannot accurately catch the target position in the groove. As a result, there is a problem that a good welded joint cannot be obtained.

The present invention provides a pipe joining welding device that can use a commercially available welding machine and can perform circumferential welding of a small diameter pipe even with a heavy welding head.

[Means for Solving the Problems] A pipe joining welding device according to the present invention holds a pipe holding device for holding one of pipes to be joined by a separable holding member, a welding head, and a welding head, and to surround the pipe. A pipe joint welding apparatus including a rotating carriage includes a pedestal that supports a pipe holding device, and two split circular guides that are fixed to the pedestal and that have a tube insertion hole in a central portion thereof. Also,
The carriage is equipped with a welding head, and has a halved rotary disc having a tube insertion hole at its center and a peripheral surface of the circular guide attached to the disc surface of the rotary disc so as to be aligned along the circumferential direction. It consists of multiple rolling rollers.

The rotating disk is composed of two half disks, and the welding head is fixed to one of the half disks. Each semi-disc has a semi-circular opening concentric therewith, and when two semi-discs are butted, a tube insertion hole is formed. The rotating disk is a motor and gear,
It is driven to rotate by a rolling mechanism such as a belt or a chain.

The circular guide is also composed of two semi-discs. Each semi-disc has a semi-circular opening concentric therewith, and when two semi-discs are butted, a tube insertion hole is formed.

About 4 to 8 rollers are suitable. When the outer circumference of the circular guide is formed into a chevron shape and the roller is a grooved roller that fits in a chevron shape, the rotary disc is securely held by the circular guide.

A saddle is removably attached to the top of the mount, and one of the two semi-discs that make up the rotary disc is connected to the semi-disc that is fixed to the saddle, of the two semi-discs that make up the circular guide. You may attach so that it can be attached and detached via. Furthermore, a trolley on which the gantry is mounted may be provided with a pivot shaft that rotatably supports the trolley around a vertical axis. The pivot shaft is located on the center of gravity line of a mount on which a circular guide, carriage, etc. are mounted.

[Operation] A rotating disk is rotatably supported by a circular guide fixed to a gantry, and a carriage that holds a welding head is supported by the rotating disk. Therefore, the weight of the welding head and carriage does not add to the joining tubes.

In the case of a device equipped with a saddle, the connecting pin is fitted into the upper half of the semi-disc that constitutes the saddle or circular guide when the device is disassembled. Then, when the saddle is lifted up, the semi-disc located above the circular guide, the roller, and the semi-disc located above the rotary disc can be separated from the gantry together with the saddle as they are.

Further, the device provided with the pivot shaft on the carriage is advantageous when connecting the pipes via the sleeve. That is,
When the welding of one tube and one end of the sleeve is completed, all the upper part of the part of the device through which the tube penetrates is removed.
Then, when the gantry is rotated by 180 ° around the pivot axis, the welding head is automatically placed in a position capable of welding the other tube and the other end of the sleeve even if the torch is inclined with respect to the tube axis.

[Embodiment] (First Embodiment) Fig. 1 and Fig. 2 show an embodiment of the present invention and are a side view and a front view of a pipe joining welding apparatus, respectively.

The pipe joining welding device mainly includes a carriage 11, a gantry 21, a pipe holding device 31, a circular guide 41, a carriage 51, a welding head 61, and a carriage driving device 71.

The dolly 11 has a pivot shaft 14 at the center of the upper surface of the frame 12.
However, the support shafts 15 are provided in the peripheral portions, respectively. Wheels 17 and supporting legs 18 are provided on the lower surface of the frame 12.

The gantry 21 is provided on a base 22 so that a first stand 23 and a second stand 26 face each other. A saddle 28 is detachably attached to the top of the first stand 23. The frame 21 is supported on the carriage 11 by the pivot shaft 14 and the support shaft 15.

The tube holding device 31 includes a first stand 23 and a second stand.
The first gripping metal 32 and the second gripping metal, which are respectively fixed on 26
It is composed of a grip metal fitting 33. Each of the gripping fittings 32, 33 is separable vertically, and a pressing fitting 35 is provided on the upper side and a V block 36 is provided on the lower side. The holding metal fitting 35 of the first gripping metal fitting 32 is attached to the saddle 28. The first grip fitting 32 holds one sleeve 5 to be joined, and the second grip fitting 33 holds the other tube 1 (or 2).

The circular guide 41 is divided into two, and two semi-discs
The upper half disk 42 is fixed to the saddle 28, and the lower half disk 43 is fixed to the main body 24 of the first stand 23. Each of the semi-discs 42, 43 is provided with a semi-circle hole 45, and when the two semi-discs 42, 43 are fitted together, the pipe insertion hole 46
Is formed. The outer circumference of the circular guide 41 has a mountain shape.

The carriage 51 includes a rotating disk 52 that is divided into two parts. The two semi-discs 53, 54 forming the rotary disc 52 each have a semi-circle hole 55, and when the two semi-discs 53, 54 are fitted together, a pipe insertion hole 56 is formed. Also, two rollers 57
Is provided on the surface of each of the semi-disks 53, 54. Roller 57
Has a groove 58 that fits into the chevron of the circular guide 41. These four rollers 57 are fitted into the circular guide 41 so as to hold the circular guide 41, and the rotary disc 52 is attached to the circular guide 41.

The welding head 61 is fixed to one of the semi-discs (upper semi-disc 53) of the circular disc 52 by a mounting bracket 65.

The carriage driving device 71 includes a motor 72 attached to the main body 24 of the first stand 23, a belt transmission mechanism 73, and a pinion 76 fixed to a driven shaft 74 of the belt transmission mechanism 73. The pinion 76 has teeth 59 cut on the outer circumference of the rotating disk 52.
It is supposed to mesh with.

With the device configured as above, the outer diameter is 8 mm and the inner diameter is 3
A method of joining and welding a mm steel tube through a sleeve will be described. The sleeve has an outer diameter of 11 mm, an inner diameter of 8.1 mm and a length of 600 mm.

One half disk 53 of the rotary disk 52 is fixed to the upper half disk 42 of the circular guide 41 attached to the saddle 28. To fix the half disk 53 of the rotary disk 52, a connecting pin 81 penetrating the half disk 53 is inserted into a hole (not shown) of the circular guide 41. Then, the saddle 23 is removed from the mount 21. Therefore, the holding metal fitting integrated with the saddle 28
35 and the upper half disk 53 of the rotary disk 52 are also removed from the gantry 21. Further, the lower half disk 54 of the rotary disk 52 is engaged with and fixed to the pinion 76. The fixing method is to insert the connecting pin 81 penetrating the semi-circular disk 54 into the hole of the circular guide 41 in the same manner as described above.

Insert the end of the sleeve 5 into the tip of the tube 1. Then, the sleeve 5 is fixed by the first grip fitting 32, and the tube 1 is fixed by the second grip fitting 33. These fixed first saddle 28
It can be fixed to the main body 24 of the stand 23 by tightening the clamp 38 and the second grip 33 with the clamp 39. The attitude of the torch 62 is adjusted by the torch position adjuster 67 so that the tip of the torch 62 aims at the end surface of the sleeve 5 at an angle of 45 °. When the setting of the torch 62 is completed, the connecting pin 81 is removed to make the rotary disc 52 rotatable.

In this state, the welding head 61 aims at the end surface of the sleeve 5 and arc-welds the corner portion of the sleeve joint to join the pipe 1 and the sleeve 5. The target angle of the groove is 45 °. The joining procedure is as follows: 12:00, 6:00, 3
Temporarily attach at 9 o'clock. Then, the welding head 61 is returned to the home position at 12 o'clock, and regular welding is performed. The welding operation is program controlled by the control panel 83.

As an example of welding conditions, the welding machine is an inverter plasma welding machine 120A type, and the plasma torch has an electrode diameter of 1.6 m.
m, the diameter of the plasma emission orifice is 1.6 mm. Ar is used as the pilot gas, and the flow rate is 0.11 / min. Also,
As the shielding gas, use a mixed gas of 1: 1 volume of Ar and He,
The flow rate is 71 / min. Base current is 100A, peak current is
120A, average current 110A, pulse width 50%, pulse frequency 500Hz, arc voltage 25V.

When the welding of the tip portion of the pipe 1 and the one end of the sleeve 5 is completed, the holding metal fitting 35 on the upper side of the first gripping metal fitting 32 is loosened. The rotating disk 52 is rotated by 180 °, and the lower half disk 54 is positioned on the upper side. Then, the connecting pin 81 is inserted into the hole of the saddle 28. In this state, when the clamp 38 of the saddle 28 is loosened and the saddle 28 is lifted, the restraint portion of the sleeve 5 can be removed all at once with the semi-disk 54 being connected. Since the semi-disk 53 to which the welding head 61 is attached is located below, the removal load becomes lighter. Next, the stopper 29 is removed, and the gantry 21 is rotated 180 ° around the pivot shaft 14. At this time, the pipe 1 and the sleeve 5 are lightly raised to avoid being caught in the concave portion of the V block 36. The dolly 11 is moved along the pipe axis direction, the aiming position is determined, the dolly 11 is stopped, and the tip of the pipe 2 is inserted into the other end of the sleeve 5. Then, the saddle 28 is mounted and the pipe 2 is fixed by the second gripping fitting 33, so that the welding posture can be immediately obtained. Even if the torch 62 is tilted with respect to the pipe axis, the welding head 61 automatically takes a posture capable of welding the other end of the pipe 2 and the other end of the sleeve 5.

To separate the device from the sleeve 5 after the joint welding has been completed, the fasteners on the splits of the pipe penetration of the device are released and the respective upper parts are removed. At this time, the saddle 28, the circular guide 28, the semi-disc 42 of the circular guide 41, and the rotating disc 52.
When the semi-discs 53 are separated from each other, the weight of the welding head 61 and the accompanying captyre cable is added when the device is assembled, and the roller 57 is moved to the circular guide 41.
Difficult to fit in. Since the upper half disk 42 of the circular guide 41 and the upper half disk 53 of the rotary disk 52 are separated while rotating and moving, the separation can be prevented by stopping this rotation. The connecting pin 81 stops this rotational movement and prevents the two from separating.

When the tubes 1 and 2 are sleeved together, the torch 62 will often aim at the sleeve ends at some angle of inclination rather than perpendicular to the tube walls. Therefore, it is necessary to newly change the setting position and the setting angle of the torch 62 only by welding the one end of the sleeve 5 and then loosening the fixation of the pipe 1 and moving the device in parallel.
It is difficult to obtain stable welding conditions for work reproducibility and steadiness.
However, by rotating the gantry 180 ° as described above, it is not necessary to reset the torch 62.

(Second Embodiment) FIG. 3 shows another embodiment of the present invention. Although the welding means was plasma welding in the first embodiment, it is a YAG laser in this embodiment. It should be noted that the same reference numerals are given to the same devices and members as those in the above embodiment, and the description thereof will be omitted.

The welding energy is a minute spot laser light in which the YAG laser emitted from the YAG rod is guided by the optical fiber 85 and focused by the emitting optical unit 86.

The operation procedure is the same as in the first embodiment. It should be noted that the emitting optical unit 86 rotates 360 ° and the laser light is emitted. Therefore, it is desirable from a safety point of view to provide a laser light shielding device in order to prevent the laser light from being applied to the portion other than the welded portion.

A method for joining and welding a SUS340 stainless steel tube having an outer diameter of 1.2 mm and an inner diameter of 0.8 mm by using the device configured as described above through a sleeve will be described. The sleeve has an outer diameter of 1.
It is 5 mm, inner diameter 1.3 mm, and length 500 mm.

The YAG laser welding conditions were a laser output of 2 Jul / pulse, a pulse repetition rate of 5 pulses / sec, a focal length of the emitting optical section of 50 mm, and the processing point was finished with just focus.
The core diameter of the optical fiber that guides the laser is 300 μm, and the laser irradiation angle to the processed part is 45 °. The welding was completed at the welding speed of 4 seconds per revolution, and the spot welding was 20 points on the entire circumference.
The pulse was controlled so that it started at the same time as the rotation and ended at the same time after one rotation. Removal of pipe restraints and pedestals 21 of 18
The procedure after 0 ° rotation is the same as in the first embodiment.

Even if the camera 89 (see FIG. 2) of the joint monitoring TV monitor was mounted on the rotary disk 52, the deflection of the tip portion of the torch 62 could be suppressed to a size that would not interfere with the joint welding.

The present invention is not limited to the above embodiment. For example, when the one pipe 2 to be joined is already fixed to something, the second stand 26 and the second pipe holding device.
31 is unnecessary. When butt welding the pipes 1 and 2 to be joined, the torch 62 is vertical to the pipe axis, so
It is not necessary for 21 to have a structure capable of rotating 180 ° about the vertical axis.

EFFECTS OF THE INVENTION In the present invention, since the carriage is attached to the pedestal, the weight of the welding head and the carriage does not add to the joining pipe. Therefore, it is possible to prevent the tip end of the torch from swinging even when the welding head moves violently. Further, since the tube holding portion is also attached to the gantry together with the carriage, the relative position between the tube joining portion and the torch can be maintained accurately. As a result, it is possible to obtain a good bead pipe-welded portion having no defects. In addition, the reproducibility of returning to a predetermined position can be improved while maintaining the accuracy of the torch rotational movement angle, enabling repeated rotational movement welding under an automated software program.

For devices equipped with a saddle, when disassembling the device,
The upper part of the circular guide, the roller, and the upper part of the rotating disk can be separated from the lower part of the device as a unit. Also, in a device with a pivot shaft on the carriage, after welding one pipe and one end of the sleeve, rotate the gantry 180 ° around the pivot shaft and align the torch with the groove, and the torch will move the pipe shaft. Even if the welding head is inclined with respect to, the welding head automatically takes a posture capable of welding the other tube and the other end of the sleeve. Therefore, it is not necessary to readjust the angle of the torch with respect to the tube axis, and the welding can be performed with good reproducibility under the same conditions as the previous time and without trouble. As a result, the efficiency of the pipe joining work can be improved.

As is clear from the above, the present invention exhibits a remarkable effect when it is necessary to precisely adjust the positions of the joining portion and the joining head in joining the small diameter pipes.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a side view of a pipe joint welding apparatus, FIG. 2 is a front view of the apparatus shown in FIG.
The figure shows another embodiment of the present invention, and a side view of a pipe joining welding apparatus, and FIG. 4 is a front view of a conventional pipe joining welding apparatus. 1,2 …… pipe, 5 …… sleeve, 11 …… carriage, 12 …… frame, 14 …… pivot shaft, 21 …… frame, 23 …… first stand, 26 …… second stand, 28 …… Saddle, 31 ... Pipe holding device, 32 ... First pipe gripping fixture, 33 ... Second pipe gripping fixture, 41 ... Circular guide, 42,43 ... Half disk, 46 ... Pipe insertion hole, 51 ... … Carriage, 52 …… Rotating disk, 53,54 ……
Half-disc, 56 …… Pipe insertion hole, 57 …… Roller, 58 …… Teeth,
61 ... Welding head, 62 ... Torch, 71 ... Carriage drive device, 72 ... Motor, 73 ... Belt transmission mechanism, 76 ...
… Pinion, 81… Connecting pin, 83… Control panel, 85… Optical fiber cable, 86… Emitting optics.

Claims (3)

(57) [Claims] 1. A pipe joining welding device comprising a pipe holding device for holding one of pipes joined by a separable holding member, a welding head, and a carriage holding the welding head and rotating around the pipe. A pedestal that supports the pipe holding device,
And a halved circular guide fixed to the pedestal and having a tube insertion hole in the center, the carriage is equipped with the welding head, and a halved rotary disk having the tube insertion hole in the center, and a disk surface of the rotary disk. A pipe joining welding device, comprising a plurality of rollers which are mounted so as to be lined up along the circumferential direction and roll on the peripheral surface of the circular guide. 2. A saddle is removably attached to the top of the mount, and one of the two semi-discs forming the rotary disc is one of the two semi-discs forming the circular guide. The pipe joining welding device according to claim 1, which is detachably attached to a semi-disc fixed to the saddle via a connecting pin. 3. A trolley for mounting the gantry,
The pipe joining welding apparatus according to claim 1 or 2, wherein the carriage is provided with a pivot shaft that rotatably supports the frame around a vertical axis.