JPS61147971A - Automatic welding device - Google Patents

Abstract

PURPOSE:To provide a device which permits easy butt welding of pipes for a boiler etc. with the small spacing from the adjacent pipe by providing a rotating body and gaseous Ar passage to a support fixed to a pipe to be welded and providing a groove guide roller to a welding head mounted to said rotating body. CONSTITUTION:An attaching body 2 mounted to an attaching table 40 is fixed to the pipe 11 in the stage of welding the butt pipes 11, 12. A sleeve 35 is then inserted into the pipe 11 and the support 3 is imposed on the base 40. A screw 34 is rotated to dispose an electrode 63 to the position where the electrode faces a groove face 10. A clamping lever 74 it thereupon rotated in the direction A to fix the support 3 to the pipe 11 and thereafter a motor 52 is run, then the rotating body 5 attached rotatably to the support 3 rotates around the pipe 11. The welding head 8 mounted to the body 5 is guided and rotated along the weld line X-X according to the rotation of the rotating body. An arc is generated at the same time between the face 10 and the electrode 63 and gaseous Ar is supplied to the face 10 through the passage 4, by which welding is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic welding device for pipes used in boilers and the like, and more particularly to an automatic welding device for butt-welding adjacent pipes with small intervals.

[Background of the invention]

Conventionally, when welding butt pipes, one or two workers manually welded while walking around the weld line around the circumference of the pipe, which required a large number of man-hours and was extremely inefficient. . Further, as an automatic welding method, an automatic welding device is used in which a guide rail is fixed to the outer peripheral surface of one of the butt pipes, and the welding head is run using the guide rail as a guide to weld the butt pipes.

[Problem that the invention seeks to solve]

However, with the above conventional automatic welding equipment, if the distance between the butt pipe to be welded and another adjacent pipe is small, there may not be enough space to attach a guide rail, and the automatic welding equipment is large. Therefore, welding work is very slow.
Sometimes it was impossible. Further, it was extremely troublesome to attach and detach the guide rail to and from the outer peripheral surface of the pipe each time.

SUMMARY OF THE INVENTION An object of the present invention is to solve such problems and provide an automatic welding device that can easily weld a butt pipe with a small distance from another adjacent pipe.

[Means for solving problems]

To achieve this objective, the present invention provides a support fixed to a butt pipe to be welded, a rotating body attached to the support so as to rotate around the pipe, and a welding head attached to the rotating body. and a groove guide roller supported by the welding head and engaged with the groove surface of the butt pipe, and an argon gas passage for supplying argon gas to the ['c surface] in the support body. It was established.

[For production]

According to the above configuration, the welding head travels along the welding line guided by the groove guide roller that engages with the groove surface of the butt tube, and the argon gas passage is provided on the groove surface of the butt tube. Argon gas is supplied through the tube, and the butt tube is welded in an argon gas atmosphere.

〔Example〕

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

The automatic welding device 1 includes a mounting body 2, a support 3, an argon gas passage 4, a rotating body 5, a rotating body drive mechanism 6, a welding head 8, and a groove guide roller 9. , a butt pipe 11 with a V-shaped groove surface 10 formed as a weld base material.
12 is shown as an example.

For installation, the body 2 includes a first bracket 14 and a second bracket 15. The first bracket 14 is formed in a U-shape, and a pair of opposing side walls 14a are ,
It is arranged between the pipe 11 and other adjacent pipes 11A and IIB.

Further, a notch 14b is formed near the tip of the side wall 14a, and the notch 14b has a cutout 14b that is located on the center line connecting the axis of the tube 11 and the axes of the adjacent tubes 11A and IIB. A spacer 16 inserted between the container tubes is fitted into the spacer 16.

The second bracket 15 is formed into a prismatic shape, and as shown in FIG.
& It is housed inside with a small gap. A pair of side walls 15a of the second bracket 15 facing the side wall section 14a are provided with a guide hole, a hole, and a hole. They fit into elongated holes 14c formed in the portions 14a, respectively. Further, as shown in FIG. 3, a V-shaped recess 15b that can come into contact with the outer peripheral surface of the tube 11 is formed on the left side of the second bracket 15, and a recess 15b formed on the right side.
In c, the head 18a of the tightening screw 18 screwed onto the first bracket 14 is accommodated so as to protrude from the seat plate 21 fixed to the right side with a mounting screw 20.

At the tip of the tightening screw 18 protruding from the first bracket 14, a tightening dial 22 is fixed by a seven-pin pin 23.

The second bracket 15 has a pair of guide bars 29 fixed by nuts 28 to a cross roller stand 26 which is slidably attached to a stand 40 via a cross roller guide 25. It is fitted in an upright position via a ball bearing 30, and has seven flange portions 29a formed at its tip.

A vertical adjustment screw 33 disposed parallel to the guide bar 29 is screwed onto the nut 32 screwed onto the second bracket 15 . A vertical adjustment dial 34 is fixed to the tip of the vertical adjustment screw 33.

The support body 3 includes a sleeve 35, a guide case 36, a gear case 38, and a gas case 39. The sleeve 35 is mounted on a stand 40, and its inner diameter is set to be the same as the outer diameter of the tube 11. Further, as shown in FIG. 1, the sleeve 35 is vertically divided into two parts, and a slit 35& is formed along the dividing line. It is fixed with a mounting screw 41, and a through hole 36a into which the sleeve 35 is inserted is formed in the center thereof. The spring plunger 43 screwed onto the outer circumferential surface of the spring plunger 43 is screwed onto a threaded portion 35C formed on the outer circumferential surface of the sleeve 35, thereby integrally fixing the sleeve 35 and the guide case 36. be done. The sleeve 3 is inserted into the through hole 36a of the guide case 36.
A ring-shaped groove 36e communicating with the sleeve 35m is formed over the entire circumference perpendicular to the axis of the through hole 36m, and a groove 36cK is formed on the outer peripheral surface of the guide case 36.
A communicating through hole 36d is formed. Furthermore, a gripping body 45 of 4f[ is fixed to the outer peripheral surface of the guide case 36.

The gear case 38 is integrally fixed to the outer peripheral surface of the guide case 36, and the gear case 38 includes the guide case 3.
A hollow hole 38m communicating with the through hole 36d of No. 6 is formed. Further, the outer peripheral surface of the gear case 38 has a hollow hole 38 &
A hose nipple 48 is attached to which a pipe (not shown) for supplying argon gas to the hollow hole 38a is fixed.

The gas case 39 is formed into a hollow cylindrical shape consisting of a small diameter part 39& and an enlarged diameter part 39b. ,
It is fixed to the rotating body 5 with a mounting screw 50SC. A through hole 39e having approximately the same diameter as the outer diameter of the sleeve 35 is formed in the inner peripheral surface of the small diameter portion 39a, and as shown in FIG. 1, a through hole 39d at the upper open end side of the through hole 39c
The diameter is set smaller than the diameter of the through hole 39c and slightly larger than the outer diameter of the tube 11. The upper part of the gas case 390 through hole 39c is arranged to face the groove surface 10 of the butt pipe 11.12.

The argon gas passage 4 is connected to the hollow hole 38 of the gear case 38 and
, groove 36C1 of guide case 36, through hole 36d1, slit 31 of sleeve 35, and gas case 390 through hole 3
It is composed of 9c and 39d.

The rotating body 5 is formed into a hollow cylindrical shape and is housed in a hollow chamber formed in the guide case 36. The inner peripheral surface of the rotating body 5 is fitted into the outer peripheral surface of the sleeve 35, and the gas case 39 is fixed to the upper part of the sleeve 35 as described above. Furthermore, a toothed portion 5b is formed at the lower part of the outer circumferential surface of the rotating body 5.

The rotating body drive mechanism 6 includes a drive motor 52 and a gear reduction mechanism 53, and the drive motor 52 is connected to the gear case 3.
It is fixed upright at 8. The gear reduction mechanism 53 includes a motor gear 5 fixed to the rotating shaft 52a of the drive motor 52.
5, a first large gear 56 meshing with the motor gear 55, and a small gear 58 integrally formed with the first large gear 56.
and a second large gear 59 that meshes with the toothed portion 5b of the rotating body 5, and these gears are accommodated in a hollow chamber formed in the gear case 38 with an r offset.

Further, the first large gear 56, small gear 58, and second large gear 59 are connected to gear shafts 60 and 61 fixed to the gear case 38.
The shafts are rotatably inserted into the shafts, with their axial movement restricted.

The welding head 8 is integrally fixed to the gas case 39, and the welding head 8 has a collet 62 with a stain pole 6 so as to face the butt pipe 11°120 welding line XX.
3 is installed, and the electrode 63 is connected to a slip ring 6 that is fitted and fixed to the outer peripheral surface of the small diameter portion 39a of the gas case 39.
4 and a welding power source cable 65 fixed to a cover 81 described later. The groove guide roller 9 is the sixth
As shown in the figure, it is rotatably supported on the welding head 8 by a bottle screw 66, and is adapted to rotate while engaging with the groove surface 10 on the pipe 11 side.

A clamp mechanism 68 for clamping the sleeve 35 and the guide case 36 to the pipe 11 is mounted on the upper surface of the stand 40.
The clamp mechanism 68 is mounted on the base 4.
A base 69 fixed at 0 and an upright portion 69a of the base 69
A clamper 70 is slidably supported by a clamp bar 70, a link 71 is pivotally connected to one end of the clamp bar 70, and a cam body 72 is pivotally connected to one end of the link 71 and a cam body 72 formed on the base 69. It consists of a clamp lever 74 provided with a toggle clamp 73. When the clamp lever 74 is rotated in the direction of arrow A as shown in FIG.
0 is the cam surface 721L formed on the cam body 72 and the link 7
1 and the toggle clamp 73, the arrow B
, and presses the outer peripheral surface of the guide case 36 with the nut 76 fixed to the tip of the gangway parser 70.
The sleeve 35 is fixed to the outer peripheral surface of the tube 11.

A plush holder 80 is fixed to the guide case 36, and a car pump lash 82 is housed in a cover 81 fixed to the plush holder 80. The leaf spring 84I/ fixed to the plush holder 80
An electrical communication plate 88 is fixed to e, which is pressed against the slip ring 64 from c, and to a nine electrical communication plate receiver 86, which is fixed to the cover 81.

Next, the operation of the embodiment of the present gA will be explained.

When welding the butt pipes 11 and 12, first, as shown in FIG. 6, the insert ring 91 is attached to the root portion 9o. If the insert ring 91 is, for example, L-shaped as shown in the figure, insert the insert ring 91 into the root portion 90 of one of the tubes 11, and
1 is brought into contact with the root portion 90 of the other pipe 120. In addition,
The material of the insert ring 91 is substantially the same as that of the butt pipes 11 and 12.

Next, for installation, after inserting the notch 14b of the first bracket 14 of the body 2 into the spacer 16, the second bracket 15 is tightened by rotating the dial 22. The recessed portion 15b is brought into pressure contact with the outer circumferential surface of the tube 11. This fixes the mounting body 2 to the tube 11. ζNow, insert the sleeve 35 into the tube 11.
Then, the support body 3 is placed on the mounting table 40, and the mounting table 40 is moved vertically by rotating the vertical adjustment screw dial 34, so that the electrode 63 is in a position facing the groove surface 10. k so that it is placed.

And as mentioned above! When the lamp lever 74 is rotated in the direction of the arrow shown in the figure, ! The sleeve 35 and the guide case 36 are fixed to the outer circumferential surface of the tube 11 by the lamp 70. When the sliding Tanabata 52 is rotated in this state, the rotating body 5 rotates via the master gear 55, the first large gear 56, the small gear 5B, and the second large gear 59. Accordingly, the welding head 8 rotates in the same direction along the welding line XX<.

At the same time, an arc is generated between the groove surface lO of the butt pipe 11, 12 and the electrode 63, and argon gas is supplied to the groove surface 1 from the first hose nipple 48 through the argon gas passage 4.
G is supplied to the butt pipe 11 in an argon gas atmosphere.
, 12 welds are performed. At this time, the insert ring 91 is melted at the initial layer stage, and the root portion 90IIC is welded. In this way, the welding head 8 welds the groove surfaces 10 of the butt pipes 11 and 12 while rotating while being guided by the groove guide roller 9 along the welding line XX.

When removing the automatic welding device 1 from the pipe 11, the above-mentioned installation procedure can be performed in reverse, and the explanation thereof will be omitted.

As described above, automatic welding of the butt pipes 11 and 120 is performed, and since the rotating body 5 and the welding head 8 that rotates with it are formed in a narrow shape, the pipes are welded as shown in FIG. When the distance P between the pipe 11 and the other adjacent pipes 11A and IIB is small, for example, even when the distance P is 12.75 m1, the butt pipes 11 and 12 can be easily welded. On the other hand, research results have revealed that conventional automatic welding equipment cannot weld butt pipes unless the interval P is 20.5 degrees or more. Note that the groove guide roller 9 may be configured to engage with the groove surfaces 10 of both the pipes 11 and 12. Argon gas is also supplied to the groove surfaces 10 through the argon gas passage 4. Therefore, separate complicated piping is not required, and argon gas can be supplied accurately.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily weld a butt pipe with a small distance from another adjacent pipe, and the work efficiency is improved and productivity is greatly improved. Moreover, since the skill level of welding work is not required, welding defects are eliminated. Furthermore, the structure for supplying argon gas to the groove surface is simplified, and costs can be reduced.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of the automatic welding device installed on the butt pipe.
Fig. 2 is a plan view of what is shown in Fig. 1, Fig. 3 is a cross-sectional view taken along arrow l-11 in Fig. 1, Fig. 4 is a longitudinal sectional view taken along arrow W-M in Fig. 3, and Fig. 5. is a cross-sectional view taken along the line V-V in FIG. 1, and FIG. 6 is a vertical cross-sectional view showing the mutual relationship between the groove guide roller and the groove surface. l-Automatic welding equipment fl, 3-...Support, 4...
・Argon gas passage, 5...Rotating body, 8...
・Welding head. 9... Groove guide roller, 1G-, groove surface, 11° 12... Butt pipe, X-X-, welding line.

Claims (1)

[Claims] a support fixed to a butt pipe to be welded, a rotary body attached to the support so as to rotate around the pipe circumference, a welding head attached to the rotary body, and a welding head supported by the welding head to support the butt. A groove guide roller that engages with the groove surface of the pipe is provided, and an argon gas passage for supplying argon gas to the groove surface is provided in the support, and the welding is performed using the groove guide roller as a guide. An automatic welding apparatus characterized in that the butt pipe is welded by moving a head along a welding line and supplying argon gas to the groove surface through the argon gas passage.