JPH05115974A - Welding equipment having guide pipe for feeding plural wires - Google Patents

Abstract

PURPOSE:To suitably adjust a spiral angle and the position in the longitudinal direction of a welding seam at the time of manufacturing a spiral steel pipe by a welding torch using plural wires as consumable electrodes. CONSTITUTION:A wire guide tube 9 wherein the plural wires 4 are inserted, respectively are received with play in a hole 1a in the axial direction of the wire feed guide pipe 1. The rear end of the wire feed guide pipe 1 is connected freely rotatably to an outlet side wire guide member 2 integrated with a wire feeder 3 and made fixable selectively by a set screw 11. The welding torch 6 is connected freely rotatably to the front end of the wire feed guide pipe 1 and made fixable selectively by a set screw 1 and a cap nut 14. When the rear end of the wire feed guide pipe 1 and the welding torch 6 are rotated to adjust the position of the welding torch 6, an adjusting allowance can be absorbed by twist of the guide tube 9 of the plural wires.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding apparatus having a wire feeding guide pipe, and more particularly to a plural wire feeding apparatus used for welding an inner surface of a spiral steel pipe in a spiral steel pipe manufacturing facility. The present invention relates to a welding device having a guide pipe.

[0002]

2. Description of the Related Art For example, an inner surface welding apparatus for welding the inner surface of a spiral steel pipe in a spiral steel pipe manufacturing facility is shown in FIG. In FIG. 4, a support beam 17 as a support is provided so as to extend in the left-right direction in the drawing, which is the pipe axis direction of the spiral steel pipe 16, and the lower end surface of the support beam 17 has a predetermined shape. A large number of inner surface forming rolls 18 are arranged with a pitch of. These inner surface forming rolls 18 and 2 not shown
By the outer surface forming rolls of the row, the strip conveyed at a predetermined angle with respect to the axis of the spiral steel pipe 16 to be formed is formed into a spiral shape with the spiral angle. Adjacent side edges of the spirally shaped strip are, for example, three welding torches 1 provided at the front end portion of the support beam 17 on the left side of the drawing.
The spiral steel pipe 16 is manufactured by welding with 9a to 19c.

The welding torches 19a to 19c have wires as consumable electrodes fed separately from wire feeders 21a to 21c provided on the rear end side of the support beam 17, respectively. It is used for arc welding. In the support beam 17, a wire feeding guide pipe 20a for guiding each wire from the wire feeding devices 21a to 21c toward the welding torches 19a to 19c.
˜20c are received, and at the front end of the support beam 17, the ends of the wire feeding guide pipes 20a to 20c on the side of the welding torches 19a to 19c are slidably and axially slidable around the axis. Pipe support member 22 for movably supporting
Is provided.

In the above welding apparatus, the welding torch 19 is used.
The wire feeding guide pipes 20a to 20c are provided at the rear end of the support beam 17 for adjusting the front and rear positions of the a to 19c.
The front-back position adjusting devices 23a to 23c are provided for each of them. Since the front-rear position adjusting devices 23a to 23c have the same structure as each other, one front-rear position adjusting device 2 is provided.
3a will be described below. A support base 24 that supports the wire feeding device 21a, a guide bar 25 fixed to the support base 24, and a lower end surface of the support beam 17 that slidably supports the guide bar 25. Guide member 26 fixed to the
And a cylinder 27 for driving the guide bar 25 to move the wire feeding devices 21a to 21c in the front-back direction via the support base 24. Cylinder 2
7 is configured to be expanded and contracted by a control command of a control device (not shown), and the wire feeding guide pipe 2
A welding energizing cable 28 is connected to the rear end of 0a.

In the welding device thus constructed,
Although the inner surface side of the spiral steel pipe 16 is welded as described above, when performing welding using a plurality of welding torches, the spiral angles of the plurality of welding torch rows, the pipe axial direction positions, and the welding seams are used when changing the size of the steel pipe. It is necessary to adjust the longitudinal position. The adjustment of the spiral angle is to align the row of wire feed holes of the welding torch with the longitudinal angle of the strip with respect to the axis of the spiral steel pipe to be formed, and the adjustment of the pipe axial position is to adjust the welding torch row to the pipe. The position of the weld seam in the longitudinal direction is adjusted by moving the weld torch row forward and backward on the joining line between adjacent side edges of the strip during spiral steel pipe forming. Is to match.

Among the above-mentioned adjustments, in order to rotate the wire feeding guide pipe 20a around its axis when adjusting the spiral angle and the position of the welding seam longitudinal direction, the rear end of the wire feeding guide pipe 20a is rotated. This can be performed by using the tilt angle adjusting device 29 that supports the portion. The inclination angle can be changed by automatically or manually rotating the wire feeding guide pipe side by an electric motor.

However, when a plurality of thin wires are used for high efficiency welding, when the L-shaped wire feeding guide pipe is rotated as in the conventional example, the tip of the welding torch at the front end is rotated. There arises a problem that the direction of the row of the plurality of wire power supply holes provided in the welding nozzle is displaced from the longitudinal direction of the welding seam.

[0008]

SUMMARY OF THE INVENTION In view of the above problems of the prior art, the main object of the present invention is to use a welding torch using a plurality of wires, for example, a spiral angle and a weld seam in the production of a spiral steel pipe. It is an object of the present invention to provide a welding device having an improved guide pipe for feeding a plurality of wires so that the longitudinal position can be adjusted appropriately.

[0009]

According to the present invention, such an object is to provide a plurality of consumable electrodes as a consumable electrode from the wire feeding device provided on the rear end side to the welding torch provided on the front end side. In order to guide the wire, there is provided a wire feeding guide pipe that receives the wire with play, and the wire feeding guide pipe is rotatable about an axis relative to the wire feeding device. The welding torch is connected to a front end portion of the wire feeding guide pipe so as to be rotatable about an axis line and selectively fixable. It is achieved by providing a welding device having a guide pipe for feeding a plurality of wires.

[0010]

With this configuration, the wire feeding guide pipe can be rotated by making the wire feeding guide pipe rotatable relative to the wire feeding device, and at the same time, the welding torch can be rotated. The welding torch can be rotated by making the rod rotatable relative to the front end of the wire feeding guide pipe, and the spiral angle of the welding torch and the position of the welding seam in the longitudinal direction can be adjusted.
A plurality of wires are received with play in the wire feeding guide pipe, and the plurality of wires are provided in the span between the rotatable support portion on the wire feeding device side of the wire feeding guide pipe and the welding torch. Since the angle can be twisted, the angle adjustment allowance can be favorably absorbed by the twist, and the adjustment can be performed without trouble.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is an enlarged view showing a main part of a wire feed guide pipe 1 used in an inner surface welding apparatus similar to a conventional example for welding the inner surface of a spiral steel pipe in a spiral steel pipe manufacturing facility to which the present invention is applied. It is a side view.

The right rear end in the figure of the wire feed guide pipe 1 received in a welding beam (not shown), which may have the same structure as the conventional example, extends from the rear end of the support beam to the rear thereof. A wire feeding device 3 is connected to a rear end portion of the wire feeding guide pipe 1 via a wire feeding side guide member 2 fixed by, for example, a fixed support (not shown). .. This wire feeder 3
Has a drive roll 3a driven by a motor (not shown) integrally attached to the frame, and an opposite pressing roll 3b elastically urged toward the drive roll 3a, and is supplied from the right side of the drawing. The wire 4 having a small diameter (for example, φ1.6 mm) as a consumable electrode is
By rotating the drive roll 3a while elastically sandwiching it between the 3b, the wire is fed toward the wire feed guide pipe 1.

The rear end of the wire feeding guide pipe 1 is integrated with the wire feeding device 3 so as to project coaxially from the wire feeding device 3 toward the wire feeding guide pipe 1. They are connected via the wire outlet side guide member 2. The protruding front end portion of the wire exit side guide member 2 is reduced in diameter over a predetermined length, and the rear end portion of the wire feeding guide pipe 1 is surrounded by the reduced diameter portion 5 so as to be rotatable around its axis. It is fitted to do.

The front end portion on the left side of the wire feeding guide pipe 1 in the drawing is bent downward at a substantially right angle with respect to the portion extending along the pipe axis direction as in the conventional example. ,
A welding torch 6 is integrally connected to the downward front end portion. The welding torch 6 has a rear portion which is coaxially rotatably immersed in the front end opening portion of the wire feeding guide pipe 1 and a front end portion of the top member 7 which is screwed with a cap nut so as to be coaxial. The welding nozzle 8 is fixed.

From the wire feeder 3, for example, two wires 4 are fed as consumable electrodes.
The nozzle portion facing between the rolls 3a and 3b of the wire exit side guide member 2 is provided with axial holes parallel to each other from the opening end to the intermediate portion. The wire 4 is inserted. From the front end of the reduced diameter portion 5 to the axial hole, the wire exit side guide member 2 holds the rear end portions of the two wire guide tubes 9 into which the wires 4 are respectively inserted in a retracted state. It is fixed. Therefore, there is no gap between the wire 4 fed from the wire feeding device 3 and the inside of the wire feeding guide pipe 1, and even a wire 4 having a small diameter does not buckle. In particular, according to this embodiment, the wire 4 is inserted into the wire guide tube 9, so that the buckling of the wire 4 having a small diameter can be preferably prevented.

As shown in FIG. 2, these wire guide tubes 9 are received with play in the axial holes 1a of the wire feeding guide pipe 1, and their front ends are
The welding torch 6 is retained and fixed in the top member 7 of the welding torch 6 in a retracted state. Both ends of the wire guide tube 9 are fixed, but a relatively long wire feed guide pipe 1
To some extent within the axial bore 1a.

By the way, a set screw 11 is screwed to the rear end of the wire feed guide pipe 1 fitted to the wire exit side guide member 6 so as to be projected and retracted in the radial direction. By loosening the set screw 11, the wire feeding guide pipe 1 can be rotated as shown by an arrow A in FIG. 1, and by screwing the set screw 11, the wire feeding guide pipe 1 can be rotated at a predetermined turning angle. Is designed to be fixed. In addition, across the wire feeding guide pipe 1 and the wire outlet side guide member 6,
A scale display plate 12 is provided to indicate the rotation angle.

A set screw 13 is screwed into the front end of the wire feed guide pipe 1 into which the rear portion of the top member 7 of the welding torch 6 is inserted so that the set screw 13 can be projected and retracted in the radial direction. A cap nut 14 for selectively fixing the top member 7 to the wire feed guide pipe 1 is screwed. By loosening the cap nut 14 and the set screw 13, the top member 7, that is, the welding torch 6 can be rotated relative to the front end of the wire feeding guide pipe 1 as shown by an arrow B in FIG. The welding torch 6 is fixed at a predetermined angle by screwing them together. A scale display plate 15 for indicating the rotation angle is provided even between the top member 7 and the wire feed guide pipe 1.

In the welding device constructed in this way,
A plurality of pipes can be used as in the conventional example, and a pipe axis direction moving device that is linearly driven by a cylinder, a motor, or the like is provided for each, and the welding torch 6 is used by using the wire 4 fed from the wire feeding device 3. The rows may be arc welded onto the weld seams of adjacent side edges of the strip to produce a spiral steel tube. At this time, when changing the size of the steel pipe, it is necessary to adjust the spiral angle, the pipe axial direction position, and the weld seam longitudinal direction position of the plurality of welding torch rows.

The position adjustment in the tube axis direction can be performed by appropriately displacing the wire feed guide pipe 1 in the tube axis direction by the tube axis direction moving device. In order to adjust the spiral angle and the position of the welding seam in the longitudinal direction, as shown in FIG. 3, the welding nozzle 8 is centered on the welding seam S and the welding nozzle 8 is used to pass the two wires 4.
The row direction of the two power supply holes 8a provided on the end surface of the nozzle is aligned with the spiral angle θ.

In order to move the welding nozzle 8 on the welding seam S which is the longitudinal direction of the welding seam, the wire feeding guide pipe 1 is used together with the pipe axial direction moving device as described above.
This can be done by loosening the set screw 11 at the rear end portion and rotating the wire feed guide pipe 1. Therefore, as shown in the conventional example, it is not necessary to integrally rotate the wire feeding device and the welding torch, and the equipment amount can be reduced. Further, the welding nozzle 8 can be adjusted to the spiral angle θ by loosening the set screw 13 and the cap nut 14 at the front end portion of the wire feeding guide pipe 1 and rotating the welding torch 6 as described above. is there.
Then, after rotating each by a predetermined angle, the set screws 11 and 13 are screwed in and positioned. This angle adjustment allowance is provided between the welding torch 6 and the wire feeding device 3 because both wire guide tubes 9 are received with play in the axial hole 1a of the wire feeding guide pipe 1 between them. Since both wire guide tubes 9 are twisted, the twisting allows the wire guide tubes 9 to be absorbed properly.

In this embodiment, a set screw and a cap nut are used to rotatably and fixedly support the wire feed guide pipe 1 and the welding torch 6, respectively.
Each combination is not limited to this embodiment, and only a set screw or only a cap nut may be used. Further, another fixing / releasing mechanism such as fastening with a band member can be used.

[0023]

As described above, according to the present invention, in a case where a plurality of wires are used to perform welding by one welding torch, a plurality of wires are received with play in the wire feeding guide pipe. By making the wire feeding guide pipe rotatable relative to the wire feeding device, it is possible to adjust the angle around the axis of the wire feeding guide pipe with respect to the wire feeding device. Is rotatable relative to the front end portion of the wire feeding guide pipe, it is possible to adjust the angle around the axis of the welding torch of the wire feeding hole array of the welding torch. Therefore, when used for the inner surface welding device of the spiral steel pipe, the spiral angle of the welding torch and the position of the weld seam longitudinal direction can be easily adjusted, so that the efficiency of each of the above-mentioned adjustment operations when changing the size of the steel pipe can be improved. ..

[Brief description of drawings]

FIG. 1 is a side view showing an enlarged main part of a wire feed guide pipe of an inner surface welding apparatus in a spiral steel pipe manufacturing facility to which the present invention is applied.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a side view schematically showing an inner surface welding apparatus in a conventional spiral steel pipe manufacturing facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wire feeding guide pipe 1a Axial direction hole 2 Wire exit side guide member 3 Wire feeding device 3a Drive roll 3b Opposing pressing roll 4 Wire 5 Reduced diameter portion 6 Welding torch 7 Top member 8 Welding nozzle 8a Power feeding hole 9 Wire guide tube 11 Set Screw 12 Scale Display Plate 13 Set Screw 14 Cap Nut 15 Scale Display Plate 16 Spiral Steel Pipe 17 Support Beam 18 Inner Forming Roll 19a-19c Welding Torch 20a-20c Wire Feeding Guide Pipe 21a-21c Wire Feeding Device 22 Pipe Support members 23a to 23c Front-rear position adjusting device 24 Support base 25 Guide bar 26 Guide member 27 Cylinder 28 Welding energizing cable 29 Tilt angle adjusting device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyoshi Majima 1 Kimitsu, Kimitsu City Nippon Steel Corporation Kimitsu Steel Works

Claims (1)

[Claims] 1. A wire feeder for receiving a plurality of wires as consumable electrodes with play in order to guide a plurality of wires as consumable electrodes from a wire feeder provided at a rear end side toward a welding torch provided at a front end side. A guide pipe for wire feeding, the guide pipe for wire feeding is supported so as to be rotatable about an axis relative to the wire feeding device and selectively fixable, and the welding torch is A welding apparatus having a plurality of wire feeding guide pipes, which is connected to a front end portion of the wire feeding guide pipe so as to be rotatable about an axis and selectively fixable.