JP3197211B2 - Automatic welding equipment for pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable automatic pipe welding apparatus used for butt welding pipes such as pipes.

[0002]

2. Description of the Related Art An automatic welding apparatus which can be detachably mounted on a pipe and can perform welding work while fixing the pipe without rotating it is disclosed in Japanese Utility Model Laid-Open No. 56-80971 and Japanese Patent Publication No. 6-61620. And Japanese Patent Application Laid-Open Nos. 6-126488 and 6-238439.

[0003] Each of these has a structure in which a rotating body is rotated around a pipe by a drive unit such as a motor, and the pipes are butt-welded by a welding work unit such as a torch installed on the rotating body. ing.

[0004]

However, the conventional automatic welding apparatus has various problems as described below. That is, any of the automatic welding devices disclosed in the above publications,
The drive unit, the rotating body, and the welding operation unit are integrated, and when the automatic welding device is mounted on the pipe, the entire device must be mounted on the pipe at once, which is extremely difficult to handle.

The automatic welding apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 56-80971 has a structure in which the automatic welding apparatus is attached to the pipe by a clamp device that opens and closes the pipe. Requires a space for opening and closing the clamp device at the time of mounting, and could not be used where the circumference of the pipe was narrow.

[0006] With regard to the automatic welding apparatus disclosed in Japanese Patent Application Laid-Open No. 6-238439, a driving bogie having a driving section is arranged on one side of a pipe, and a torch bogie having a torch on the other side. Are arranged, and these are connected by connecting means so that both trucks rotate around the pipe at the same time,
Inevitably, both trucks were enlarged, and this automatic welding device could not be used where the circumference of the pipe was narrow.

Further, Japanese Utility Model Laid-Open Publication No. 56-80971, Japanese Patent Publication No. 6-61620, and Japanese Patent Laid-Open Publication No. Hei 6-12648.
The automatic welding apparatus disclosed in Japanese Patent Publication No. 8 uses a gear device composed of a pinion and a cylindrical rack that goes around the outside of the pipe as a rotation transmitting means from the driving unit to the rotating body. It is difficult to respond to piping,
There are disadvantages, such as the need to prepare and use a plurality of automatic welding devices having racks according to the outer diameter of the piping.

The present invention has been made in view of the above-mentioned problems of the prior art, and can reduce the size of the apparatus, facilitate mounting on a pipe, and easily cope with various pipes having different diameters. An object of the present invention is to provide an automatic welding device for pipes.

[0009]

The present invention has the following features to attain the object mentioned above. The present invention is an automatic pipe welding apparatus for butt-welding two pipes,
(A) a drive section, (b) a traveling section, and (c) a nozzle holder.

(A) Drive Unit The drive unit has a drive motor for driving the turn belt,
Removably mounted on one tube.

It is preferable that the driving section includes an elevator that adjusts a height position of the driving motor. In this way, by changing the height position of the drive motor, the height position of the rotating shaft of the drive motor can be changed, thereby reducing the tension of the turn belt stretched between the drive motor and the traveling unit. Can be adjusted.

The means for attaching the drive unit to the tube includes a base having a U-shaped cross section mounted on the tube, belts attached to both sides of the base and capable of being wound around the tube, and a tightening device for connecting and winding the two belts together. And a container.
In this case, the portion protruding outside the tube can be reduced, and the mounting of the drive unit to the tube can be facilitated. Since the base has a U-shaped cross section, the drive unit can be attached to the pipe in a correct posture.

(B) Traveling section The traveling section is constituted by connecting a plurality of component pieces so as to be rotatable with each other, and each component piece has a roller that travels on the outer peripheral surface of the one pipe. The connected component is assembled in an annular shape so as to make a round around the outside of the tube, is detachably attached to the tube, and is driven by a turn belt of the driving unit to rotate around the tube.

(C) Nozzle holder The nozzle holder is fixed to one component piece of the traveling section, and feeds a welding wire toward a groove.
A weaving device for weaving the nozzle along the axial direction of the tube.

Preferably, the nozzle holder is provided with a position adjusting mechanism for causing the weaving device to move in parallel along the axial direction of the tube. By doing so, the tip of the welding wire can be correctly positioned just above the groove.

A configuration may be adopted in which a sealing gas such as carbon dioxide gas can be ejected from the nozzle so as to seal around the welding wire.

The operation of the drive motor of the drive section and the operation of the weaving device of the nozzle holder are automatically controlled by a control unit. Here, the automatic control of the operation means, for the drive motor, control of the operation start and operation stop timing, operation speed and the like, and for the weaving device, the start and stop timing of the weaving, and the direction of the weaving, Control of amplitude, speed, etc.

In this automatic pipe welding apparatus, since the nozzle holder performs welding while making a round around the pipe, the welding position changes depending on the running position of the nozzle holder. Therefore, the drive unit of the drive unit and the operating conditions of the weaving device are input to and stored in the control unit in advance so that the optimum welding conditions are obtained for each welding position, and the automatic operation is performed based on this.

The automatic pipe welding apparatus of the present invention is suitable for butt-welding pipes, but it can butt-weld tubular objects other than pipes.

[0020]

FIG. 1 is a block diagram showing an embodiment of the present invention.
14 to FIG. FIG. 3 shows a pipe 21 suspended and fixed from the ceiling of a building using an automatic pipe welding apparatus of the present invention (hereinafter simply referred to as a welding apparatus).
1 is an overall configuration diagram of a welding system when butt welding 1 and 212 are performed.

The welding device 1 is automatically supplied with a welding wire 111 from a wire supply device 110 and a gas cylinder 120.
, A carbon dioxide gas as a seal gas is automatically supplied. Further, the wire supply device 110 is electrically connected to the welding machine 130 so that an arc current flows through the welding wire 111, and the ground wire 131 of the welding machine 130 is electrically connected to one pipe 211. Welding machine 130
Are electrically connected to the control unit 140, and the control unit 140 automatically controls the current, voltage, and the like. The welding machine 130 and the control unit 140 are a three-phase 200 volt power supply 150.
It is connected to the.

FIG. 1 is a front view of the welding apparatus 1, and FIG. 2 is a left side view of the same. The welding device 1 includes a driving unit 10 and a traveling unit 30.
And a nozzle holder 50. Each part will be described in detail below.

[Drive Unit] FIG. 4 is a front view of the drive unit 10, FIG. 5 is a plan view thereof, FIG. 6 is a left side view thereof, and FIG. 7 is a right side view thereof. The drive unit 10 includes a base 11 having a U-shaped cross section that can be placed on the pipe 212, and fixing belts 12 and 13 are connected to both sides of the base 11. Fixing belt 1
2 and 13 are wound so as to hold the pipe 212,
The end of the other fixing belt 13 is connected to the tightening device 14 with the ratchet mechanism connected to the end of the one fixing belt 12, and the handle 14 a of the tightening device 14 is operated to connect the fixing belt 13. By winding up, the base 11 can be firmly fixed to the pipe 212. Further, the tightening device 14 has a release mechanism (not shown), and after the welding is completed, the fixing belt 13 is loosened by the release mechanism, and the base 11 can be removed from the pipe 212.

An elevator 15 is installed on the base 11, a motor mount 16 is installed on the elevator 15, and a drive motor 18 for rotating a turn belt 17 on the motor mount 16 and a motor. The cover 19 is fixed. As the drive motor 18, a stepping motor that is small, can obtain high torque, has a built-in electromagnetic brake, and can freely control the speed is used. The ON / OFF and rotation speed of the drive motor 18 are controlled by the control unit 140. The motor cover 19 protects the drive motor 18 from welding heat and spatter.

When the handle 15b provided on the fixed base 15a is rotated, the slider 15c mounted on the fixed base 15a moves horizontally in the left and right directions in FIGS. 6 and 7 to move with the slider 15c. The movable table 15d is connected to the guide rod 1 by a cam mechanism provided between the movable rod 15d and the table 15d.
It is structured to move up and down guided by 5e. Therefore, the drive motor 18 can be moved up and down by the lift 15, and the position of the rotating shaft 18 a of the drive motor 18 can be adjusted in the vertical direction.

A pulley 20 is fixed to a tip of a rotation shaft 18a of the drive motor 18. A guide 21 is fixed to a side surface of the fixed base 15a, and a guide groove 21a is formed on a lower surface of the guide 21.

Since the base 11 of the drive unit 10 has a U-shaped cross section, the drive unit 10 can be mounted in a correct posture by bringing the opening side into contact with the pipe 212, and the rotation of the drive motor 18 Connect the axis of the shaft 18a to the pipe 21
It can be arranged parallel to the two axes.

The pipes 21 are fixed by the fixing belts 12 and 13.
The drive unit 10 attached to the second unit 2 has a small portion protruding outside the pipe 212, and only a portion having the drive motor 18 protrudes. The position of the drive motor 18 on the circumference of the pipe 212 can be determined according to the situation around the pipe 212. This is convenient when the space around the pipe 212 is uneven.

[Traveling Unit] The traveling unit 30 is attached to the pipe 212 at a position closer to the tip than the driving unit 10. The traveling unit 30 is configured by connecting a large number of traveling plates (constituent pieces) 31 so as to be rotatable with each other, and is attached so as to go around the pipe 212.

FIG. 8 is a part of an exploded view of the traveling section 30.
9 is a sectional view taken along line II of FIG. 8, and FIG. 10 is a front view of the traveling plate 31. The traveling plate 31 has a flat plate shape, and has cylindrical connecting portions 32 and 33 at its front end and rear end, respectively. Then, one support shaft 34 is inserted into the connecting portion 32 at the front end of the running plate 31 and the connecting portion 33 at the rear end of the running plate 31 adjacent to the running plate 31 to easily connect the running plates 31 adjacent to each other. It is constituted so that it can be connected to.

Leg plates 35 are fixed to both sides of the rear surface of the traveling plate 31, and a roller 36 that travels while rotating on the surface of the pipe 212 is rotatably attached to the tip of the leg plate 35.

At the center of the upper surface of the traveling plate 31, a belt guide 3 is provided.
7 is fixed, and a recess 37 a with which the turn belt 17 is engaged is formed in the belt guide 37. On every other traveling plate 31 in the traveling unit 30, a rod 38 stands upright from the upper surface located on the side close to the driving unit 10,
A guide roller 39 is rotatably mounted on the upper part.

The pulley 20 of the drive unit 10 and the traveling unit 3
0, a turn belt 17 is provided as shown in FIG.
When the drive motor 18 is rotated, the pulley 20 rotates, the pulley 20 rotates the turn belt 17, and the turn belt 17 is rotated.
Causes the traveling unit 30 to travel around the pipe 212. At this time, the turn belt 17 is engaged with the concave portion 31a of the traveling plate 31 so as not to come off from the traveling plate 31, and the guide roller 39 of the traveling plate 31 passes through the guide groove 21a of the guide 21 of the drive unit 10. To prevent the traveling section 30 from meandering.

[Nozzle Holder] One traveling plate 31 of the traveling section 30 is provided with a base 51 of a nozzle holder 50.
Is fixed by projecting its tip to the tip side of the pipe 212.

FIG. 11 is a front view of the nozzle holder 50, and FIG.
2 is a left side view of the same. A torch mount 52 is fixed on the base 51, and a weaving device 53 is installed on the torch mount 52.

The weaving device 53 is for weaving a long tip 63 described later in the axial direction of the pipes 211 and 212, and has a built-in weaving motor composed of a micro stepping motor. The weaving motor reciprocates the slider 53a horizontally in the left-right direction in FIG. 11 (ie, in the axial direction of the pipes 211 and 212). A torch support base 55 is fixed to the leading end of the slider 53a via an attachment 54. The ON / OFF of the weaving motor, the rotation direction and the rotation speed are controlled by the control unit 140.

The torch support 55 is made of bakelite, which is an insulating material, and is supported by two guide rods 56.
(In the direction of the axis of the shaft 212).
Both ends of the guide rod 56 are fixed to a pillar 57 rising from the base 51.

The torch mount 52 has a position adjusting mechanism. By rotating a handle 52a provided on the torch mount 52, a weaving device 53 is provided.
In the left-right direction in FIG.
(Maximum about 30 mm). Therefore, the handle 52
By rotating a, the torch support 55 together with the weaving device 53 can be moved in the left-right direction.

As shown in FIG. 13, the torch support 55 is provided with a hole 55a penetrating vertically, and a screw ring 59 is fixed on the upper surface of the torch support 55 concentrically with the hole 55a. . The torch 60 is inserted into the hole 55a. A male screw portion 60a is formed on the upper outer peripheral surface of the torch 60. The male screw portion 60a is screwed into a screw ring 59, and a screw ring 61 for locking is further screwed into the male screw portion 60a. It is fixed to the torch support 55.

Inside the torch 60, a gas passage hole 6 is provided at the lower part.
0b is formed, a screw hole 60c is formed in the upper part, and a female screw is formed in the lower inner peripheral surface of the gas passage hole 60b. A gas supply pipe (not shown) is connected to the gas passage hole 60b, and carbon dioxide gas is supplied from the gas cylinder 120.

A hollow cylindrical wire supply pipe 62 is screwed and fixed in the screw hole 60c of the torch 60. The distal end of the wire supply pipe 62 projects into the gas passage hole 60b,
The inner peripheral surface of the distal end is a screw hole, into which a hollow cylindrical long tip 63 is screwed and fixed.

The welding wire 111 automatically supplied from the wire supply device 110 passes through the wire supply pipe 62 and the long tip 63 and is provided for welding. Torch 60
The nozzle 64 is screwed and fixed to the tip of the gas passage hole 60b. The nozzle 64 has a substantially conical shape, and has a gas passage hole 64a opened on the upper surface formed therein. At the center of the tip of the nozzle 64, there is provided a hole 64b connected to the gas passage hole 64a, and the tip of the long tip 63 is inserted into this hole 64b.

As shown in FIG. 14, the holes 64 of the nozzle 64
A plurality of gas ejection holes 64c connected to the gas passage holes 64a are provided at equal intervals around b. Gas cylinder 120
Supplied to the gas passage hole 60b of the torch 60 is ejected from the gas ejection hole 64c through the gas passage hole 64a of the nozzle 64, and the periphery of the welding wire 111 sent from the long tip 63 is sealed with carbon dioxide gas. I do.

The welding device 1 is mounted on the pipe 212 in the following procedure. First, a required number of traveling plates 31 are prepared in accordance with the outer diameters of the pipes 211 and 212 to be welded, and the traveling plates 31 are connected to form the traveling section 30 and attached to the pipe 212.
At this time, the traveling unit 30 is positioned so that the tip of the nozzle 64 of the nozzle holder 50 is located near the groove of the pipes 211 and 212.
Position.

Next, the driving unit 10 is connected to the fixing belts 12 and 1.
3 and attached to the pipe 212 by the fastener 14. At this time, the drive unit 10 is positioned so that the guide roller 39 of the traveling unit 30 passes through the guide groove 21a of the guide 21 of the drive unit 10.

Then, a turn belt 17 is stretched between the pulley 20 and the traveling section 30, and the handle 15b of the lift 15 of the drive section 10 is operated to raise and lower the movable base 15d, thereby adjusting the tension of the turn belt 17. .

Next, the handle 52a of the nozzle holder 50
To connect the weaving device 53 to the pipes 211 and 212.
And the nozzle 64 is adjusted so that the tip end of the nozzle 64 is located directly above the groove of the pipes 211 and 212.

After the welding device 1 is mounted on the pipe 212 in this manner, the operating conditions of the welding device 1 are input to the control unit and stored. The operating conditions of the welding device 1 are as follows.

Timing of operation and stop of drive motor 18 and rotation speed during operation Timing of operation and stop, rotation direction and rotation speed of weaving motor serving as drive source of weaving device 53 Timing of operation and stop of wire supply device 110 And the feeding speed of the welding wire 111 The timing of the operation and stop of the welding machine 130 and the magnitude of the current and the voltage After that, the operation of the welding device 1 is performed fully automatically according to the welding conditions. That is, the operation of the drive motor 18 causes the turn belt 17 to rotate, and the traveling unit 30 rotates outside the pipe 212. The rotation of the traveling unit 30 causes the nozzle holder 50 attached to the traveling plate 31 to rotate outside the pipe 212, and the welding wire 111 sent out from the nozzle 64 of the nozzle holder 50 is subjected to butt welding of the pipe 211 and the pipe 212. .

Thus, in this welding device 1,
Since the pipes 211 and 212 do not rotate and the nozzle holder 50 welds the entire circumference of the pipes 211 and 212 while rotating around the pipe 212, the welding posture changes every moment.

Therefore, when welding is performed by the welding apparatus 1, welding conditions of the welding apparatus 1 are set in advance so that a welding pattern suitable for each welding posture is obtained. Hereinafter, a welding pattern when the pipes 211 and 212 to be welded are white gas pipes will be described.

[0052]

[Embodiment 1] FIG. 15 is a view showing the correspondence between the welding positions in the circumferential direction of the pipes 211 and 212 and the welding patterns.
In FIG. 15, a welding position A is a position at which the welding wire 111 is sent out from directly below the nozzle 64, and welding is started from this position.
It is assumed that welding proceeds in the order of → C → D → A.

From the welding position A to the welding position B, welding is performed with the welding pattern (I) shown in FIG. 16, and from the welding position B to the welding position C, welding is performed with the welding pattern (II) shown in FIG. From the welding position D to the welding position D, and the welding pattern (III) shown in FIG.
Until the welding is performed with the welding pattern (I). 16 to 18, the X direction in the drawings is the welding direction (that is, the pipe 2
The Y direction indicates the weaving direction of the nozzle 64 (that is, the axial direction of the pipes 211 and 212).

The welding pattern (I) shown in FIG. 16 will be described. Start the arc welding start point a ₁ in the weld pattern (I), the nozzle holder 50 is stopped (i.e., the drive motor 18 is stopped), performed by weaving (i.e., by forward rotation of the weaving motor) a Up to _two points
Continue the arc and proceed while welding.

When the nozzle 64 reaches the point a ₂ , weaving is performed (ie, the weaving motor is rotated in the reverse direction) while the nozzle holder 50 is moved forward (ie, the drive motor 18 is rotated), and the arc is generated. while continuing to welding advance up to _three points a.

When the nozzle 64 reaches the point a ₃ , the nozzle holder 50 is stopped, the weaving is stopped, the arc is stopped, and the welding is stopped. The stop time is set to 0.3 to 0.5 seconds.

The above movement is one cycle, and this cycle is repeated, and the process proceeds in the order of a ₃ → a ₄ → a ₅ → a ₆ → a ₇ → a ₈ .

The welding pattern (II) shown in FIG. 17 will be described. Start the arc welding start point b ₁ in the weld pattern (II), the nozzle holder 50 is stopped, by performing only weaving (i.e., by forward rotation of the weaving motor) b to ₂ points, and to continue the arc welding Proceed while doing.

When the nozzle 64 reaches the point b ₂ , the arc is stopped, the weaving is stopped, and the nozzle holder 50 is stopped.
To advance only to b ₃ points. That is, while the nozzle 64 moves to the b ₃ points from b ₂ points not performed the welding.

When the nozzle 64 has reached b ₃ , the nozzle holder 50 is stopped, arcing is resumed, and weaving is performed (ie, the weaving motor is rotated in the reverse direction), from point b _{3 to} point b _4. Weld.

When the nozzle 64 reaches the point b ₄ , the arc is stopped, the weaving is stopped, and the nozzle holder 50 is stopped.
Only advance to b ₅ points. That is, while the nozzle 64 moves to the b ₅ points from b ₄ points not performed the welding.

The above operation is one cycle, and this cycle is repeated, and the sequence proceeds in the order of b ₅ → b ₆ → b ₇ → b ₈ → b ₉ → b ₁₀ .

The welding pattern (III) shown in FIG. 18 will be described. This weld pattern (III), carried out continuously arc from the welding start point c ₁ to the welding end point, a complete continuous welding is performed. In addition, each turning point c ₂ , c ₃ , c
_4, except that _{c 5, c 6, c 7} , in c ₈ stops nozzle holder 50 weaving is stopped, the nozzle holder 50 is advanced continuously, weaving is carried out continuously.

These welding patterns (I), (II) and (III)
The present invention sets the carbon dioxide gas seal in the best condition and prevents the occurrence of welding defects such as pinholes and blowholes caused by the combustion of zinc contained in the white gas pipe.

[0065]

[Embodiment 2] FIGS. 19 to 21 show welding patterns in Embodiment 2. FIG. 19 corresponds to the welding pattern (I) of FIG. 16 in the first embodiment, FIG. 20 corresponds to the welding pattern (II) of FIG. 17 in the first embodiment, and FIG. 21 corresponds to the first embodiment. Figure 18 in
This corresponds to the welding pattern (III). The difference between the welding patterns of the second embodiment and the first embodiment is that the weaving width of each of the welding patterns is smaller than that of the first embodiment. The other welding conditions are the same as those of the first embodiment.

[0066]

Third Embodiment FIGS. 22 to 24 show welding patterns in a third embodiment. FIG. 22 corresponds to the welding pattern (I) in FIG. 16 in the first embodiment, FIG. 23 corresponds to the welding pattern (II) in FIG. 17 in the first embodiment, and FIG. Figure 18 in
This corresponds to the welding pattern (III). The difference between the welding conditions of the third embodiment and the first embodiment is that the weaving width of each pattern is reduced and the welding speed (ie, the forward speed of the nozzle holder 50) is reduced. The welding conditions are the same as in the first embodiment.

[0067]

As described above, according to the present invention,
Since the traveling unit and the nozzle holder are separate from the driving unit and can be separately mounted on the pipe, the welding device can be easily mounted. In addition, the driving unit itself does not move around the pipe, and a traveling unit in which a number of components are rotatably interconnected is wound between the pulley and the traveling unit of the driving unit.
Since the running part runs around the pipe with the wrapped turn belt, large components such as the drive motor can be installed on the outer surface of the pipe at an appropriate position on the outer circumference of the pipe at any position where there is enough mounting space. it is possible to, the order structure
It is easy to use, but can be used in places where the circumference of piping is narrow.

Since the running portion is formed by connecting a plurality of component pieces, the number of component pieces can be easily changed by changing the number of component pieces according to the outer diameter of the pipe to be welded. can do.

When the drive unit is provided with an elevator, the tension of the turn belt stretched between the drive motor and the traveling unit can be easily extended. When the nozzle holder is provided with a position adjusting mechanism, the tip of the nozzle can be easily positioned at a correct position above the butt groove of the tube.

[Brief description of the drawings]

FIG. 1 is a front view of an automatic pipe welding apparatus according to the present invention.

FIG. 2 is a left side view of the automatic pipe welding apparatus of the present invention.

FIG. 3 is an overall configuration diagram of a welding system using the automatic pipe welding apparatus of the present invention.

FIG. 4 is a front view of a driving unit in the automatic pipe welding apparatus of the present invention.

FIG. 5 is a plan view of a driving unit in the automatic pipe welding apparatus of the present invention.

FIG. 6 is a left side view of a driving unit in the automatic pipe welding apparatus of the present invention.

FIG. 7 is a right side view of a drive unit in the automatic pipe welding apparatus of the present invention.

FIG. 8 is a development view of a traveling section in the automatic pipe welding apparatus of the present invention.

FIG. 9 is a sectional view taken along the line II of FIG. 8;

FIG. 10 is a front view of a component piece constituting a traveling section in the automatic pipe welding apparatus of the present invention.

FIG. 11 is a front view of a nozzle holder in the automatic pipe welding apparatus of the present invention.

FIG. 12 is a left side view of a nozzle holder in the automatic pipe welding apparatus of the present invention.

FIG. 13 is a sectional view of a main part of a nozzle holder in the automatic pipe welding apparatus of the present invention.

FIG. 14 is a plan view of a nozzle of a nozzle holder in the automatic pipe welding apparatus of the present invention.

FIG. 15 is a diagram showing a correspondence between a welding position and a welding pattern in a circumferential direction of a pipe to be welded.

FIG. 16 is a welding pattern diagram in the first embodiment.

FIG. 17 is a welding pattern diagram in the first embodiment.

FIG. 18 is a welding pattern diagram in the first embodiment.

FIG. 19 is a diagram illustrating a welding pattern according to the second embodiment.

FIG. 20 is a diagram illustrating a welding pattern according to the second embodiment.

FIG. 21 is a welding pattern diagram in the second embodiment.

FIG. 22 is a diagram illustrating a welding pattern according to the third embodiment.

FIG. 23 is a diagram showing a welding pattern according to the third embodiment.

FIG. 24 is a diagram showing a welding pattern according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic pipe welding apparatus 10 Driving part 11 Base 12,13 Fixing belt 14 Fastener 15 Lifting table 17 Turn belt 18 Drive motor 30 Traveling part 31 Traveling plate (component piece) 36 Roller 50 Nozzle holder 52a Handle (position adjustment mechanism) 53 Weaving device 111 Welding wire 140 Control unit 211, 212 Piping (pipe)

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tadashi Shiraishi 2305-11, Kamitunno, Ogata, Nogata, Fukuoka Prefecture (56) References JP-A 1-233064 (JP, A) JP-A 61-154768 (JP, A) JP-A-4-147055 (JP, A) JP-A-53-3941 (JP, A) JP-A-5-337646 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) B23K 9/028 B23K 9/12 B23K 9/30 B23K 37/02

Claims (4)

(57) [Claims] 1. An automatic pipe welding apparatus for butt-welding two pipes, comprising: (a) a drive unit having a drive motor for driving a turn belt and detachably attached to one of the pipes; A) a plurality of component pieces having rollers running on the outer peripheral surface of the one pipe are rotatably connected to each other, are assembled in an annular shape around the outside of the pipe, and are detachably attached to the pipe; The drive unit's turn belt is wound around the outer circumference and receives the driving force
(C) a driving unit that is driven by the motor and rotates around the pipe.
A nozzle holder fixed to one component piece of the traveling portion, the nozzle for feeding the welding wire toward the groove, and a weaving device for weaving the nozzle along the axial direction of the pipe, and driving the driving unit. An automatic welding apparatus for pipes, wherein operation of a motor and operation of a weaving device for the nozzle holder are automatically controlled by a control unit. 2. The automatic pipe welding apparatus according to claim 1, wherein the driving unit includes a lifting platform that adjusts a height position of the driving motor. 3. The automatic pipe welding apparatus according to claim 1, wherein the nozzle holder includes a position adjusting mechanism for moving the weaving device in parallel along the axial direction of the pipe. 4. The drive section includes a base having a U-shaped cross section mounted on the tube, a fixing belt attached to both sides of the base and capable of being wound around the tube, and a pair of fixing belts. 4. A device according to claim 1, further comprising means for attaching to a tube comprising a tensioning device to be wound up.
An automatic welding device for pipes according to any one of the above.