JP2000117431A - Automatic welding device for circumference of tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the automatic welding of the circumference of a tube even when the tube has a small diameter by this welding device having a simple construction by providing a moving mechanism moving a mounted welding head in the prescribed direction and a holding mechanism with the moving mechanism mounted, which holds the tube. SOLUTION: The outer periphery of an existing tube P1 is caught from both side directions and is held by a tube holding mechanism 2. While a welding head 1 travels in the peripheral direction of the tube, a welding wire 13 is supplied from a welding torch 11, and the full-circled welding of a welding groove W to a joint tube P2, is performed. By catching the outer periphery of the existing tube P1 from both sides and by holding it, the whole welding device is supported. Therefore, even if the tube has a small diameter, welding can be performed. An automatic welding device has preferably an X drive mechanism by which a welding head is moved by a moving mechanism along a weld line extending in the circumferential X direction of the tube, a Z drive mechanism moving the X drive mechanism in the Z direction out of two directions Y and Z on a surface crossing the weld line and a Y drive mechanism moving the Z drive mechanism in the Y direction. Consequently, a position adjustment is easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic pipe circumference welding apparatus for butt welding pipes in gas or oil pipeline laying work or the like. In particular, the present invention relates to a pipe circumference automatic welding apparatus capable of automatically butting and welding small-diameter pipes.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 7-12542 discloses an automatic pipe circumference welding apparatus called spin arc welding. FIG. 6 is a perspective view schematically showing an automatic pipe circumference welding apparatus disclosed in Japanese Patent Publication No. Hei 7-12542.
In the drawing, reference numeral 120 denotes a circumferential guide rail mounted on the butted pipe 110, and 121 denotes an automatic welding machine installed on the circumferential guide rail 120. In this embodiment, two automatic welding machines 121 are installed. I have.

[0003] An automatic welding machine 121 is provided with a traveling device 122 which travels on an outer peripheral surface of a pipe 110 while being guided by a circumferential guide rail 120, and a slide Y-axis provided on the traveling device 122 and which is slidable in a groove width direction. 123 and slide Y
A slide Z-axis 124 connected to the shaft 123 and slidable in the torch height direction, and a torch support 125 attached to the slide Z-axis 124 so as to be swingable in the pipe circumferential direction.
, A welding torch 126 rotatably supported by a torch support 125, and a wire feeding device 127 provided on the traveling device 122.

[0004] In the configuration of each part, the circumferential guide rail 1
20 has a spacing member 201 on the inner surface and external teeth 2 on the outer surface.
02 is formed. In addition, the automatic welding machine 121
The traveling device 122 includes a traveling vehicle 221 and a traveling vehicle 221.
The outer teeth 20 of the circumferential guide rail 120
2, a gripping mechanism 223 provided below the traveling vehicle 221 to grip both ends of the circumferential guide rail 120, and an X-axis encoder provided on the traveling vehicle 221 to drive with the traveling vehicle 221 225 with an X-axis motor 224.

Reference numeral 231 denotes a Y-direction drive mechanism for driving the slide Y-axis 123 in the groove width direction, and 241 denotes a slide Z-axis 1
24 in the torch height direction.
Reference numeral 51 denotes a β-direction drive mechanism for adjusting the angle of the welding torch 126 in the β-direction. Reference numeral 261 denotes a rotary drive welding mechanism inside the welding torch, which has a rotary motor 262 with an R-axis encoder 263. The wire feeding device 127 is a wire feeding mechanism 2
It comprises a wire feed motor 272 for driving 71 and a wire reel 274. 130 is the welding wire 1
A conduit cable 129 having a built-in 31 is a traveling position detector provided on the traveling carriage 122.

[0006]

Problems to be Solved by the Invention
No. 42 pipe circumference automatic welding equipment has a pipe diameter of several tens of mm.
It is suitable as an apparatus for butt welding pipes with a large diameter of several thousand mm. However, since the pipe circumference automatic welding apparatus is large in structure, it is not suitable as an apparatus for butt welding small-diameter pipes having a pipe diameter of about several mm. Conventionally, there has been no automatic pipe circumference welding apparatus that can sufficiently meet such a demand.

SUMMARY OF THE INVENTION The present invention has been made in order to cope with such a problem, and an object of the present invention is to provide a pipe circumference automatic welding apparatus capable of automatically butting and welding small-diameter pipes.

[0008]

In order to solve the above problems, an automatic pipe circumference welding apparatus according to the present invention includes a welding head equipped with a welding torch and automatically welds the circumference of the pipe. An automatic welding apparatus, comprising: a moving mechanism mounted with a welding head and moved in a predetermined direction; and a gripping mechanism mounted with the moving mechanism and gripping a pipe. With such a structure, the gripping mechanism grips the pipe, and in this state, the moving mechanism moves the welding head in the circumferential direction of the pipe. Since the structure is simple in this way, even if the pipe diameter is small, the circumference of the pipe can be automatically welded.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the automatic pipe circumference welding apparatus according to the present invention, the moving mechanism moves the welding head along a welding line extending in the circumferential direction (X direction) of the pipe (X drive mechanism). ), A mechanism for moving the X drive mechanism in the Z direction (Z drive mechanism), and a mechanism for moving the Z drive mechanism in the Y direction, in two directions (Y direction and Z direction) in a plane intersecting the welding line. (Y drive mechanism). Thus, by providing the Z drive mechanism and the Y drive mechanism, even if the welding position is slightly shifted, the position can be easily adjusted and positioned.

Further, in the automatic pipe circumference welding apparatus according to the present invention, the X drive mechanism is formed in an arc shape, and includes a drive section (X drive section) having a fixed welding head and rotating in the X direction. It is preferable to include a driving force transmitting unit (X driving force transmitting unit) that transmits driving force to the X driving unit, and a motor (X motor) that generates the driving force. As described above, since the X drive unit to which the welding head is fixed is formed in an arc shape, the pipe can be taken in and out of the cutout portion, and the welding operation efficiency can be improved.

Further, in the automatic pipe circumference welding apparatus according to the present invention, the Z drive mechanism transmits a drive force for moving a plate to which the X drive mechanism is fixed in the Z direction. It is preferable to include a power transmission unit) and a motor (Z motor) that generates the driving force. By providing such a Z driving force transmission unit and a Z motor separately, independent control is possible, so that positioning accuracy in the Z direction can be improved.

Further, in the automatic pipe circumference welding apparatus according to the present invention, the Y drive mechanism transmits a drive force for moving a plate to which the Z drive mechanism is fixed in the Y direction. It is preferable to include a power transmission unit) and a motor (Y motor) that generates the driving force. By providing such a Y driving force transmission unit and a Y motor separately, independent control is possible, so that the positioning accuracy in the Y direction can be improved.

In the automatic pipe circumference welding apparatus according to the present invention, the gripping mechanism includes a driving unit (K driving unit) that grips the outer periphery of the pipe by sandwiching the outer circumference from both sides (K direction);
It is preferable to include a driving force transmitting unit (K driving force transmitting unit) that transmits driving force to the K driving unit, and a motor (K motor) that generates driving force to the K driving unit. As described above, the K drive unit can support the entire pipe circumference automatic welding apparatus by sandwiching and grasping the outer periphery of the pipe from both sides, so that even if the pipe has a small diameter, it is possible to cope with the welding. It can be done reliably.

An automatic pipe circumference welding apparatus according to the present invention includes a welding head equipped with a welding torch and a mechanism for moving the welding head along a welding line extending in the circumferential direction (X direction) of the pipe (X drive mechanism). And a mechanism for moving the X drive mechanism in the Z direction (Z drive mechanism) in two directions (Y direction and Z direction) in a plane intersecting the welding line, and a mechanism for moving the Z drive mechanism in the Y direction ( A Y-drive mechanism), and a gripping mechanism that grips the pipe by mounting the shift mechanism, and automatically welds the circumference of the pipe; The X drive mechanism is
A drive unit (X drive unit) that is formed in an arc shape and has a welding head fixed and rotates in the X direction; a drive force transmission unit (X drive force transmission unit) that transmits a drive force to the X drive unit; A motor (X motor) for generating the driving force, wherein the Z driving mechanism transmits a driving force for moving a plate to which the X driving mechanism is fixed in the Z direction.
A driving force transmission unit) and a motor (Z
A driving force transmitting unit (Y driving force transmitting unit) for transmitting a driving force for moving the plate on which the Z driving mechanism is fixed in the Y direction, and generating the driving force. A driving unit (K driving unit) that holds the pipe by sandwiching the outer circumference of the pipe from both sides (K direction), and a driving force transmission that transmits driving force to the K driving unit. (K driving force transmission unit), and a motor (K motor) for generating driving force to the K driving unit.

Since the structure is simplified by such a configuration, even if the pipe diameter is small, the circumference of the pipe can be automatically welded. Also, since the X drive unit to which the welding head is fixed is formed in an arc shape,
The pipe can be taken in and out of the notched portion, and the welding operation efficiency can be improved. Also, Z
Since the driving force transmission unit and the Z motor and the Y driving force transmission unit and the Y motor are individually provided, they can be controlled independently, and even if the welding position is slightly shifted, the position can be easily adjusted and the positioning accuracy in the Z direction can be adjusted. And the positioning accuracy in the Y direction can be improved. In addition, since the K drive unit can support the entire pipe circumference automatic welding apparatus by sandwiching and grasping the outer periphery of the pipe from both sides, even if the pipe has a small diameter, it can cope with the welding, and the welding can be reliably performed. It can be carried out.

Hereinafter, an automatic pipe circumference welding apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially sectional plan view showing a configuration of an automatic pipe circumference welding apparatus according to one embodiment of the present invention. FIG. 2 is a partially sectional side view showing the configuration of the automatic pipe circumference welding apparatus according to one embodiment of the present invention.

This pipe circumference automatic welding apparatus 1A is a device for circumferentially assembling two small-diameter pipes P1 and P2 whose welding head 1 is joined at a welding groove W. The pipe P1 is an existing pipe already laid at the end of the pipeline, and the pipe P2 is a connecting pipe connected to the end thereof. This pipe circumference automatic welding device 1A
The pipe gripping mechanism 2 sandwiches the outer circumference of the existing pipe P1 from both sides (also referred to as the K direction) and grips the same. The welding head 1 travels in the circumferential direction of the pipe (also referred to as the X direction) while welding from the welding torch 11. The wire 13 is paid out and the welding groove W is welded all around.

The welding head 1 is attached to a pipe gripping mechanism 2 via a moving mechanism 3. The moving mechanism 3 includes an X driving mechanism 4 that is movable in a pipe circumferential direction (X direction),
An x drive mechanism 5 movable in the tangential direction of the pipe circumference (herein referred to as x direction), and a pipe radial direction (also called Z direction)
And a Y drive mechanism 7 that is movable in the longitudinal direction of the pipe (also referred to as the Y direction).

First, the detailed structure of the X drive mechanism 4 will be described with reference to the side views of FIGS. 1 and 3 and the plan view of FIG. The X drive mechanism 4 is generally constituted by an X drive section 41, an X drive force transmission section 42, and an X gear motor 43. The X drive unit 41 includes an X slider ring 41a, a guide ring 41b, and a support ring 41c that are missing in the circumferential direction by about 1/3. On the outer peripheral surface of the X slider ring 41a,
Teeth are formed. A head frame 12 supporting the welding head 1 is fixed to one end surface of the X slider ring 41a, and a convex portion of the guide ring 41b is fitted into a concave portion on the other end surface.

A support ring 41c is fitted on the inner peripheral surfaces of the X slider ring 41a and the guide ring 41b. Then, the guide ring 41b and the support ring 41c
Is fixed to the body frame 44 with screws. Pipes P1 and P2 are arranged in the center axis direction of the X drive unit 41. Thus, the X slider ring 41a is supported by the support ring 4 while being guided by the convex portion of the guide ring 41b.
1c can be rotated along the outer peripheral surface.

The X driving force transmitting section 42 includes one gear 42a.
And the six rollers 42b to 42g and the timing belt 4
2h and a helical gear 42i. Gear 42a
The shaft 42aa is parallel to the rotation axis of the X slider ring 41a, and is fixed to the main body frame 44 at a predetermined distance through the bearing 42ab. And
One side of the shaft 42aa, that is, the X slider ring 41a
A flat gear 42ac is fixed on one side, and a helical gear 42ad is fixed on the other side. The teeth of the flat gear 42ac and the teeth formed on the outer peripheral surface of the X slider ring 41a are formed so as to mesh with the timing belt 42h.

Each shaft 42b of the six rollers 42b to 42g
“a” to “42ga” are fixed to the main body frame 44 so as to be in line symmetry with a line connecting the rotation center of the X slider ring 41a and the rotation center of the flat gear 42ac in parallel with the axis 42aa of the flat gear 42ac. . That is,
The two rollers 42b and 42c are connected to the X slider ring 4
It is arranged so as to be in contact with both outer peripheral surfaces in the radial direction of 1a via a timing belt 42h. Two rollers 42
The d and 42e are arranged below the rollers 42b and 42c at a predetermined distance from the X slider ring 41a. The two rollers 42f, 42g are rollers 42d,
It is arranged below the flat gear 42ac at a predetermined distance below 2e.

The timing belt 42h is formed in a loop shape, passes from the flat gear 42ac through the rollers 42d and 42e, between the rollers 42b and 42c and the X slider ring 41a, and passes through the rollers 42f and 42f.
It is hung over g. The roller 42
e is configured to be slightly movable, so that the timing belt 42h can be prevented from loosening. The X gear motor 43 is fixed to the frame 46 with screws.
The frame 46 is provided with a rotating shaft 43 of the X gear motor 43.
a so that the helical gear 42i fitted into the helical gear 42a meshes with the helical gear 42ad.
, So that it is detachably fixed to the main body frame 44.

As described above, when the X gear motor 43 is driven, its rotational force is transmitted from the helical gear 42i to the flat gear 42ac via the helical gear 42ad.
The timing belt 42h is paid out. Then, since the X slider ring 41a is rotated by the feeding of the timing belt 42h pressed against the rollers 42b and 42c, the welding head 1 is moved in the X direction via the head frame 12 fixed to the X slider ring 41a. It becomes possible.

Next, the detailed structure of the x drive mechanism 5 will be described with reference to FIG. The x driving mechanism 5 includes an x driving unit 51,
It is roughly composed of an x driving force transmission section 52 and an x gear motor 53. The x drive unit 51 includes an x slider 51a and a guide 51b. The x slider 51a is a linear bearing, and is fixed to the frame 46 such that the longitudinal direction is the x direction. The guide 51b is formed in a rod shape and has a groove 51aa formed in the x slider 51a.
It is fitted inside. Thereby, the x slider 51a
Can be moved in the x direction along the guide 51b.

The x driving force transmitting section 52 includes a rack 52a and a pinion gear 52b. The rack 52a is fixed to the frame 46 such that the longitudinal direction is the x direction. The x gear motor 53 is fixed to the frame 47 by screws. The frame 47 has an x gear motor 53
Pinion gear 52b fitted on the rotary shaft 53a
Are fixed to the frame 48 with screws so as to mesh with the rack 52a. The frame 47 includes a guide 51b.
Has been fixed. As described above, when the x gear motor 53 is driven, its rotational force is transmitted to the rack 52a via the pinion gear 52b. Then, the x slider 51a
Move along the guide 51b, so that the X drive mechanism 4
At the same time, the welding head 1 can be moved in the x direction.

Next, the detailed structure of the Z drive mechanism 6 will be described with reference to FIG. The Z drive mechanism 6 is generally constituted by a Z drive force transmission unit 61 and a Z gear motor 62. Z
The driving force transmission unit 61 includes a ball screw 61a and a ball screw 61b. The ball screw 61a is fixed to the frame 48 so that the axis is in the Z direction. Z
The gear motor 62 is fixed to the frame 49 by screws. The frame 49 is screw-fixed to the frame 50 such that a ball screw 61b fitted on the rotation shaft 62a of the Z gear motor 62 meshes with the ball screw 61a. As described above, when the Z gear motor 62 is driven, its rotational force is transmitted to the ball screw 61a via the ball screw 61b. And the frame 48
Moves, so that the welding head 1 can be moved in the Z direction.

Next, the detailed structure of the Y drive mechanism 7 will be described with reference to the side views of FIGS. This Y drive mechanism 7
Is generally constituted by a Y drive unit 71, a Y drive force transmission unit 72, and a Y gear motor 73. The Y driving section 71 includes a Y slider 71a and a guide 71b. The Y slider 71a is a linear bearing, and is fixed to the pipe gripping mechanism 2 so that the longitudinal direction is the Y direction. The guide 71b is formed in a rod shape, and is fitted in a groove 71aa formed in the Y slider 71a. Thus, the Y slider 71a can be moved in the Y direction along the guide 71b.

The Y driving force transmitting section 72 includes a rack 72a and a pinion gear 72b. The rack 72a is fixed to the frame 20 so that the longitudinal direction is in the Y direction. The Y gear motor 73 is fixed to the frame 50 by screws. The frame 50 has a Y gear motor 73
Pinion gear 72b fitted on the rotating shaft 73a
Are screwed to the frame 49 so as to mesh with the rack 72a. As described above, when the Y gear motor 73 is driven, its rotational force is transmitted to the rack 72a via the pinion gear 72b. Then, since the frame 50 moves, the welding head 1 can be moved in the Y direction.

Next, the detailed structure of the pipe gripping mechanism 2 is shown in FIG.
And a side view of FIG. The pipe gripping mechanism 2 is generally constituted by a K drive unit 21, a K drive force transmission unit 22, and a K gear motor 23. K drive unit 21
Is provided with two guides 21a, two K sliders 21b, and two gripping portions 21c formed in a substantially L-shape. Each guide 21a is formed in a rod shape, and the longitudinal direction is K.
The frames are fixed to the frame 20 so as to be parallel to each other. Each K slider 21b is a linear bearing, and each groove 21ba is fitted into each guide 21a.

Each grip portion 21c has a V groove 21c inside one end.
An elastic member 21cb such as rubber provided with a is fixed. The other end of each grip 21c is fixed to each K slider 21b such that each elastic member 21cb faces each other. Thus, each K slider 21b can move in the K direction along each guide 21a, and thus each gripper 21c can be moved in the Y direction.

The K driving force transmission unit 22 includes two racks 22
a, a pinion gear 22b, a flat gear 22c, a worm gear 22d, two flat gears 22e, 22f, and a timing belt 22g. Each rack 22a
Means that each of the K sliders 21b has a longitudinal direction in the K direction.
It is fixed to. The pinion gear 22b is mounted on each rack 2
It is arranged at substantially the center of the K drive unit 21 so as to mesh with 2a. And the shaft 22ba of the pinion gear 22b
Are fixed to the frame 20 via bearings 22bb. The flat gear 22c is a pinion gear 22b.
Is fixed to one end of the shaft 22ba. Worm gear 2
2d is arranged so as to mesh with the flat gear 22c. And the shaft 22da of the worm gear 22d is
It is fixed to the frame 20 via a bearing (not shown).

The flat gear 22e is a worm gear 22d
Is fixed to one end of the shaft 22da. Flat gear 2
2 f is fitted on the rotating shaft 23 a of the K gear motor 23. The timing belt 22g is stretched between the flat gear 22e and the flat gear 22f. The K gear motor 23 is fixed to the frame 20 with screws. As described above, when the K gear motor 23 is driven, its rotational force is transmitted from the flat gear 22f to the flat gear 22e via the timing belt 22g.
Further, the power is transmitted from the worm gear 22d to each rack 22a via the flat gear 22c and the pinion gear 22b. Then, since each K slider 21b moves, it is possible to move the respective gripping portions 21c in opposite directions to widen the interval between the elastic members 21ab to separate the pipe P1, and to narrow the interval between the elastic members 21ab to grip the pipe P1. It becomes possible.

Finally, the detailed structure of the welding head 1 will be described with reference to FIGS. The welding torch 11 includes a wire bending portion 15 that bends a supplied welding wire 13 to bend in a direction along the axis of a welding nozzle 14, and a straightener that straightens the welding wire 13 that has exited the wire bending portion 15. 16 and a pull roller 17 that pulls the welding wire 13 that has exited the straightener 16 and sends it to the welding nozzle 14. The welding wire 13 is supplied by a wire feed motor 18 from a wire reel 19 attached to the rear of the pipe gripping mechanism 2.

The wire bending portion 15 is composed of a number of guide rollers. Although not shown, each guide roller is rotatably supported by a bakelite frame, which is an insulating material. The straightener 16 is provided immediately above the guide roller on the outermost side and directly below the pull roller 17. The outer peripheral surface on the right side of the straightener 16 projects slightly so as to push the welding wire 13 to the right, and corrects the bending of the welding wire 13 attached at the wire bending portion 15 by bending the bending in the opposite direction. The amount of protrusion of the straightener 16 can be adjusted by an adjustment mechanism (not shown).

The pull roller 17 is placed directly above the straightener 16. A holding roller (not shown) presses the welding wire 13 against the pull roller 17, and the pull roller 17 is driven to rotate, pulling out the welding wire 13 from the wire bending portion 15 and pressing the welding wire 13 into a welding nozzle 14 described later. The material of the pull roller 17 is SK.
3 (surface hardening). The pressing pressure of the pressing roller can be adjusted by an adjusting mechanism (not shown). In the welding torch 11, the wire bending portion 15 is configured by a roller row,
Even if the bending radius of the welding wire 13 is small, the frictional resistance is small. Further, the pull roller 17 is provided on the exit side of the wire bending portion 15.
, The welding wire 13 is pulled and driven, so that the wire feeding is smooth and the feeding of the welding wire 13 to the welding pool is stabilized.

[0037]

As is apparent from the above description, according to the present invention, since the structure is simplified, even if the pipe diameter is small, the circumference of the pipe can be automatically welded. Also, the X drive unit to which the welding head is fixed,
Since it is formed in an arc shape, the pipe can be taken in and out of the cutout portion, and the welding work efficiency can be improved. Also, since the Z driving force transmission unit and the Z motor and the Y driving force transmission unit and the Y motor are separately provided,
Each can be controlled independently, and even if the welding position is slightly displaced, the position can be easily adjusted to
The positioning accuracy in the direction can be improved. Also,
The K drive unit can support the entire pipe circumference automatic welding device by sandwiching and grasping the outer circumference of the pipe from both sides, so even if the pipe has a small diameter, it can be handled and welding can be performed reliably. Can be.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view showing a configuration of an automatic pipe circumference welding apparatus according to one embodiment of the present invention.

FIG. 2 is a partially sectional side view showing a configuration of an automatic pipe circumference welding apparatus according to one embodiment of the present invention.

FIG. 3 is a partial sectional side view showing a detailed configuration of an X drive mechanism of the automatic pipe circumference welding apparatus according to one embodiment of the present invention.

FIG. 4 is a partial cross-sectional top view showing a detailed configuration of an X drive mechanism of the automatic pipe circumference welding apparatus according to one embodiment of the present invention.

FIG. 5 is a partial sectional side view showing a detailed configuration of a pipe gripping mechanism of the automatic pipe circumference welding apparatus according to one embodiment of the present invention.

FIG. 6 is a perspective view showing a configuration of a conventional pipe circumference automatic welding apparatus.

[Explanation of symbols]

Reference Signs List 1 welding head 2 pipe gripping mechanism 3 moving mechanism 4 X driving mechanism 5 x driving mechanism 6 Z driving mechanism 7 Y driving mechanism 11 welding torch 12 head frame 13 welding wire 14 welding nozzle 15 wire bending portion 16 straightener 17 pull roller 18 wire feed Motor 19 Wire reel 20 Frame pinion 21 K drive unit 21a Guide 21b K slider 21c Gripping unit 22 K drive force transmission unit 22a Rack 22b Pinion gear 22c Flat gear 22d Worm gear 22e Flat gear 22f Flat gear 22g Timing belt 23 K gear motor 41X Drive unit 41a X slider ring 41b Guide ring 41c Support ring 42 X drive force transmission unit 42a Gears 42b to 42g Roller 42h Timing belt 42i Helica Gear 43 X gear motor 44 body frame 45 screw with attach knob 46-50 frame 51 x drive unit 51a x slider 51b guide 52 x drive power transmission unit 52a rack 52b pinion gear 53 x gear motor 61 Z drive power transmission unit 61a ball screw 61b ball Screw 62 Z gear motor 71 Y drive section 71a Y slider 71b Guide 72 Y drive force transmission section 72a Rack 72b Pinion gear 73 Y gear motor

Continued on the front page F term (reference) 4E081 AA02 AA09 AA13 AA15 BA23 BA27 BB04 BB15 DA05 DA36 DA66 EA03 EA06 EA09 EA12 EA17 EA32 EA47 EA54 EA56 FA11

Claims (7)

[Claims] 1. A pipe circumference automatic welding apparatus including a welding head equipped with a welding torch and automatically welding a circumference of a pipe; a moving mechanism mounted with the welding head and moved in a predetermined direction; An automatic pipe circumference welding apparatus, comprising: a gripping mechanism that mounts a moving mechanism and grips a pipe. 2. The moving mechanism according to claim 1, wherein said moving mechanism is arranged in a circumferential direction (X
(X drive mechanism) that moves the welding head along the welding line extending in the direction (X direction), and moves the X drive mechanism in the Z direction among two directions (Y direction and Z direction) in a plane intersecting the welding line The pipe circumference automatic welding apparatus according to claim 1, further comprising a mechanism (Z drive mechanism) for moving the Z drive mechanism in the Y direction, and a mechanism (Y drive mechanism) for moving the Z drive mechanism in the Y direction. 3. A drive unit (X drive unit), wherein the X drive mechanism is formed in an arc shape, the welding head is fixed and rotates in the X direction, and a drive force for transmitting a drive force to the X drive unit. The pipe circumference automatic welding apparatus according to claim 2, further comprising: a transmission unit (X driving force transmission unit); and a motor (X motor) for generating the driving force. 4. A driving force transmitting unit (Z driving force transmitting unit) for transmitting a driving force for moving a plate to which the X driving mechanism is fixed in a Z direction, and generating the driving force. The pipe circumference automatic welding apparatus according to claim 2, further comprising a motor (Z motor). 5. A driving force transmitting section (Y driving force transmitting section) for transmitting a driving force for moving a plate on which a Z driving mechanism is fixed in a Y direction, and generating the driving force. 3. The apparatus according to claim 2, further comprising a motor (Y motor). 6. A drive unit (K drive unit) in which the gripping mechanism sandwiches and grips the outer periphery of the pipe from both sides (K direction).
And a driving force transmitting unit (K driving force transmitting unit) for transmitting a driving force to the K driving unit; and a motor (K motor) for generating a driving force to the K driving unit. Item 2. An automatic pipe circumference welding apparatus according to Item 1. 7. A welding head equipped with a welding torch, a mechanism for moving the welding head along a welding line extending in a circumferential direction (X direction) of the pipe (X drive mechanism), and a plane intersecting the welding line. Of the two directions (Y direction and Z direction)
A mechanism for moving the X drive mechanism in the direction (Z drive mechanism);
Mechanism for moving Z drive mechanism in Y direction (Y drive mechanism)
And a gripping mechanism for gripping the pipe by mounting the moving mechanism, wherein the X drive mechanism automatically welds the circumference of the pipe automatically; Are formed in an arc shape, and a driving unit (X driving unit) to which the welding head is fixed and rotates in the X direction, and a driving force transmitting unit (X driving force transmitting unit) for transmitting a driving force to the X driving unit And a motor (X motor) for generating the driving force, wherein the Z driving mechanism transmits a driving force for moving a plate to which the X driving mechanism is fixed in the Z direction. And a motor (Z motor) for generating the driving force, wherein the Y driving mechanism transmits a driving force for moving a plate to which the Z driving mechanism is fixed in the Y direction. Section (Y driving force transmission section) and its driving force A driving unit (K driving unit) that holds the pipe by sandwiching the outer periphery of the pipe from both sides (K direction), and a driving force transmission that transmits driving force to the K driving unit. Section (K driving force transmission section),
And a motor (K motor) for generating a driving force to the K drive unit.