JPH0718412Y2 - Spiral rib welding equipment for steel pipes - Google Patents

Description

[Detailed Description of the Invention] "Industrial field of application" The present invention relates to a welding device for spiral ribs in a steel pipe.

"Prior art" From the linear steel with a circular, rectangular or similar small cross section on the entire length or part of the surface of the inner, outer or inner / outer surface of the steel pipe such as the so-called drill steel pipe pile, the mantle pipe in synthetic steel pipe, etc. As a means for producing the rib having the spiral shape attached thereto in a spiral shape, a method of flare welding the preformed spiral tube to the ready-made steel pipe by post-processing is appropriate.

As a method of joining spiral ribs to the inner and outer surfaces of such a steel pipe, a rib that has been formed into a spiral shape in advance in a steel pipe raw pipe is inserted or externally inserted and welded in the pipe axial direction while rotating the steel pipe. A method of joining the rib and the steel pipe by flare welding by moving the torch relatively, that is, rotating the steel pipe with spiral ribs attached to the inner surface or the outer surface in advance using a turning roller, at the same time (1 pitch / 1 rotation) The rib and the steel pipe are flare-welded at the pipe bottom position such that the welding torch and the steel pipe move relatively at a constant speed in the pipe axial direction. As for the movement in the pipe axis direction, the turning roller may be placed on the traveling carriage to move the steel pipe, or the welding torch fixed to the arm may be moved.

The applicant proposes a welding device suitable for this method, which is the most convenient, cheap, and rational, in Japanese Patent Application No. 63-62700.

"Problems to be solved by the invention" However, since the welding torch in the above-mentioned welding device has a fixed aiming position fixed with respect to the mounting base frame, the inner and outer parts of the steel pipe are not fixed. When the rib to be inserted is not loosely positioned and is simply loosely fitted and it is attempted to be positioned at an accurate pitch, or when it is temporarily finished and positioned at an accurate pitch. Suitable for

However, the rib is loosely fitted to the steel pipe like this,
If this is to be positioned and corrected prior to welding, the welding efficiency is reduced and a large restraining force is required, and there is a concern that the rib holding portion may be unfitted during positioning.

However, it is unrealistic to stop at a precise pitch during temporary finishing.

Therefore, at present, the ribs can be wound around the steel pipe with an appropriate fastening force, and if temporary welding can be performed like the exterior ribs, a fixed interval temporary fastening can be applied or the end fastening as much as possible. In the process, spiral molding is performed so that the loose fitting portion is in the normal position.

However, in this case, the above-mentioned apparatus has the following inconveniences. In other words, the ribs have low forming accuracy such as outer diameter and pitch, and because they are deformed by the welding heat, it is impossible to keep the aim position constant, and as a general procedure for welding when the aim position accuracy is secured. If the welding torch is simply moved at a constant speed in the pipe axis direction, it will not be possible to follow the fluctuation of the aimed position, and it will not be possible to perform beautiful welding. In addition, unreasonable stress will be applied to the device, resulting in failure or damage.

On the other hand, regarding rib welding, it is desirable to carry out automatic welding in consideration of commercialization.In particular, it is not possible to visually observe the welded part in the inner surface welding of small diameter or long pipes, and a large amount of fumes and pipes In consideration of the small space, a welding device that does not require a monitor and fine adjustment mechanism and does not require preparation is required. Therefore, a welding device that is flexible with respect to the rib before welding is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a welding device in which the welding torch can slide in correspondence with the positional deviation of the rib and can automatically follow the position of the rib. There is.

[Means for Solving the Problems] In order to configure the above object, the device according to the present invention is a welding device for welding a rib formed in a spiral shape in advance to a ready-made steel pipe, and in the pipe axial direction on a fixed base. Through the slide adjusting mechanism, the mounting base frame to be mounted is provided with a hanging leg having three points of guide rolls for pressing the both sides of the spiral rib on the tip with the pressure mechanism attached, and the guide roll of the guide roll. The device was assembled by taking out the welding torch with the spiral locus pointing a predetermined backward direction.

"Action" The guide roll that holds the ribs follows the ribs that are out of position by the adjusting mechanism, does not cause any undue stress, and surely brings beautiful welding.

[Example] Implementation will be described with reference to the drawings.

FIGS. 1a to 1c are front views of the guide rolls at three points, which are shown with the welding torch omitted, and views A, B, and C of arrows in FIG.
The view D in the figure and FIGS. 2A to 2D show a welding torch assembled 3
A front view of the guide roll portion at the point, a view b in the figure a, a view c in the figure a, a view c-c in the figure c, and a view d-d in the figure c, and FIGS. FIG. 4 is a detailed view of the part, and FIG. 4 is an embodiment diagram in the case of an outer surface spiral rib.

In FIG. 1, reference numeral 1 in FIG. 1 is an adjusting mechanism 24 that slides in the axial direction of the steel pipe 6 on a cantilever-shaped fixed base 23 having a rigidity that does not cause horizontal shake or twist in the circumferential direction. It is a mounting base frame that is mounted via the, and is designed to be suitable for installation of each component described below. 2 is a three-point guide roll 3 that presses both sides of the spiral rib 9 at the tip suspended from the mounting base frame 1.
With the drooping leg having a, 3b, 3c, the guide rolls 3a, 3b, 3c
The guide locus is swung by a predetermined angle according to the spiral locus.

A pressure mechanism for downward urging is attached to the reference portion (upper side) of the hanging leg 2 of the mounting frame 1 as necessary for the stability of the mounting frame 1, and in the illustrated example, Stretching legs 4 and 5 having air cylinders 4a and 5a are arranged at equiangular intervals in front of the hanging leg 2 including the hanging leg 2.

The figure shows the case of an inner spiral rib,
Since 5 is pressed against the inner surface of the rotating steel pipe 6, the legs 4,5
Rolling rollers 7 and 8 are attached to the tip.

As shown in Fig. C, the rolling rollers 7 and 8 are capable of swinging by a predetermined angle in accordance with the spiral locus like the guide rolls 3a, 3b and 3c.

Thus, a mechanism for holding the spiral rib 9 is provided.

Since the holding mechanism is attached to the fixed base 23 via the adjusting mechanism 24 as described above, it can be freely slid in the tube axis direction by receiving an additional force.

That is, it follows the fixing position of the rib 9.

The spiral rib 9 sandwiched above is to be welded immediately, and as shown in FIG. 2, the welding torch 10 is brought out from the mounting base frame 1 by directing it on the spiral locus behind the guide rolls 3a to 3c. It is arranged.

That is, the torch angle adjusting unit 10a is the torch horizontal fine adjustment unit 10b.
Further, it is arranged so as to be taken out from the mounting base frame 1 via the torch vertical fine adjustment section 10c and the like.

Then, by moving the steel pipe 6 fixed and equipped with the spiral rib 9 while rotating, and receiving the supply,
There is provided an apparatus 11 capable of sequentially welding unwelded spiral ribs 9.

In the case of the inner spiral rib, the lifting device 11 must be inserted into the steel pipe 6 as shown in FIG. That is, the device 11 is installed at the tip of the cantilevered beam body 13 that is horizontally carried out from the pillar portion 12a of the base 12, while the spiral rib 9 is internally loosely attached, and only the base end is manually welded. The steel pipe 6 having ribs attached by temporary fixing is horizontally placed on a turning roller 15 mounted on a traveling carriage 14 traveling on a rail portion 12b of the base 12.

The tip of the steel pipe 6 is caught 17 by the rotating mechanism 16 and the motor
Received a rotating mission from 18th.

The device 11 completes the automatic mechanical welding by welding the spiral rib 9 by traveling the traveling carriage 14 at a predetermined speed.

In the figure, 19, 20 and 21 indicate that it is easy to design a compressor, welding power source, and welding wire drum into a size that allows the above-mentioned device 11 to be inserted into a small-diameter steel pipe that cannot be entered by a person. Needless to say, a flared spiral steel bar with an outer diameter of 250 to 450φ, a wall thickness of 6 to 9mm, and a steel pipe of 3m in length with a diameter of 13φ and a pitch of 300mm is actually used for flaring. The size was 6mm (one side only), and the result was perfect.

Instead of the cantilever beam body 13, a double-supported beam body may be used.

In the case of outer spiral ribs, the device 11 must be installed against the outer upper surface of the steel pipe 6, as shown in FIG.

That is, the device 11 is mounted on the upper part of the boring portion 22a of the base 22 constituted by the boring frame body so as to penetrate the steel pipe 6 through the adjusting mechanism 24 that slides in the pipe axial direction.

On the other hand, in the case of the steel pipe 6, unlike the case of the previous figure, the spiral rib 9 is loosely attached to the exterior and attached by manually fixing the end, etc., and then assembled to the device 11, and the same as in the previous figure. Welding is applied in the same manner.

In this case, the rolling mechanism 7, 8 which is necessary for the contact with the moving body described above is not necessary for the pressing mechanism for downward urging.

"Effect of the device" Although the pitch of the rib changed slightly, the welding torch follows the position of the rib due to the synergistic effect of the guide roll and the adjuster, and it is possible to perform sound flare welding without blurring in the lateral or circumferential direction.

The inaccuracy of the finish pitch does not cause any problems in the product.

[Brief description of drawings]

FIGS. 1a to 1c are front views of the three-point guide roll portion shown with the welding torch omitted, a view of arrows A, B, C in FIG.
The view D in the figure and FIGS. 2A to 2D show a welding torch assembled 3
The front view of the guide roll portion at the point, the view b in the drawing a, the view c in the drawing a, the view c in the drawing c, the view d-d in the drawing c, and FIGS. FIG. 4 is a detailed view of the part, and FIG. 4 is an embodiment diagram in the case of an outer surface spiral rib. 1 ... Mounting base frame, 2 ... Hanging legs, 3a, 3b, 3c ... Guide roll, 4 ... Stretching legs, 4a ... Air cylinder, 5 ...
… Brace legs, 5a …… Air cylinder, 6 …… Steel pipe, 7
…… Rolling roller, 8 …… Rolling roller, 9 …… Spiral rib, 10 …… Welding torch, 10 a …… Torch angle adjustment part, 1
0b …… Torch horizontal fine adjustment unit, 10c …… Torch vertical fine adjustment unit, 11 …… Device, 12 …… Base, 12a …… Column part, 12b …… Rail part, 13 …… Cantilever beam, 14 …… Truck, 15 …… Turning roller, 16 …… Rotating mechanism, 17 …… Catch,
18 …… motor, 19 …… compressor, 20 …… welding power source, 21 …… welding wire drum, 22 …… base, 22a ……
Bore part, 23 …… fixed base, 24 …… adjustment mechanism.

Front page continuation (72) Inventor Jiro Tateno 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. Tokyo head office (56) Reference JP-A-60-87979 (JP, A) JP-A-61 -95719 (JP, A) Actual development Sho 59-140012 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A welding device for welding a rib formed in advance in a spiral shape to a ready-made steel pipe, wherein pressure is applied to a mounting base frame mounted on a fixed base through an adjusting mechanism that slides in the pipe axial direction. A drooping leg having three guide rolls that hold down both sides of the spiral rib is provided at the tip of the attached mechanism, and the welding torch is brought out by orienting the spiral locus of the guide roll to the specified rear side. Welding device for spiral ribs in steel pipes.