JP2001071133A - Device for welding inner periphery between large diameter steel pipe and pipe flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner periphery welding device with which welding work between a steel pipe such as a long size bent pipe and branch pipe and a pipe flange is efficiently executed and the stabilization of quality is realized. SOLUTION: This device has a flange fixing block 102 and chain tensioner 104 for fixing the inner periphery welding device 100 to the flange 1, a torch frame 113 which is rotated along a virtual plane which intersects an axis of the steel pipe by the rotation of a driving motor 108 provided on a slide frame 106, torch mount 116 which is supported on this torch frame 113 movably along a direction (the direction of an arrow B) intersects the axis of the steel pipe 2 and an angle adjusting mechanism for holding a welding torch 22 and also adjusting an facing angle (the direction of an arrow D) of the welding torch 22 to a place to be welded and is provided with a holding plate 120 which is supported on the torch mount 116 so as to be vertically movable along the axial direction (the direction of an arrow C) of the steel pipe 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a welding device,
More specifically, the present invention relates to an inner peripheral welding apparatus for welding a steel pipe and a flange pipe to a long bent pipe and a steel pipe such as a branch pipe using a welding torch.

[0002]

2. Description of the Related Art Conventionally, when a pipe flange is welded to a steel pipe such as a carbon steel pipe for piping, as shown in FIGS.
After positioning the pipe flange 1 at a predetermined position of the steel pipe 2,
The inner peripheral side and the outer peripheral side were welded, and the pipe flange 1 was fixed to the steel pipe 2. FIG. 7 is a partially enlarged view of a region surrounded by A in FIG.

[0003] Generally, the welded portion on the inner peripheral side is called an inner peripheral weld bead 3, and the welded portion on the outer peripheral side is called an outer peripheral weld bead 4. Such a welding operation is performed by a manual operation by an operator or an operation using a machine.

In operation using a machine, as shown in FIG. 8, a steel pipe 2 is rotated by a rotating device 10 having a rotating base 12.
To the torch 2
2 is held by using the fixing portion 20 so as to be opposed to an inner peripheral welding portion between the pipe flange 1 and the steel pipe 2. By rotating the rotation base 12 in a desired direction, the steel pipe 2 is rotated. A girth weld bead 3 is formed.

[0005]

However, the above-mentioned manual work or work using a machine has the following problems.

[0006] In the inner peripheral side welding of a long bent pipe, since it is impossible to rotate a steel pipe, work using a machine cannot be performed. Therefore, although manual work is required, in the case of this manual welding, skill is required to weld the inner circumferential bead (one round) once.

[0007] Further, since the welding operator performs the welding operation by manually moving the welding torch, a great deal of labor is required. For example, when a large-sized steel pipe is used, it takes about 30 to 40 minutes to perform the operation, and even a skilled person needs patience to continuously weld the inner circumferential bead once at one round.

[0008] Therefore, when welding is performed by dividing the circumference of the inner bead, the welding members overlap (lap welding,
As shown in FIG. 9), the overlap is inevitable and
Since many are formed, welding defects are likely to occur. As a result, rework after inspection is required.

On the other hand, in the case of work using a machine, there has been a problem that only straight or deformed pipes of a limited length can be welded.

Accordingly, an object of the present invention is to provide a long bent pipe and an inner peripheral welding work for welding a pipe flange to a steel pipe such as a branch pipe, regardless of the size of the pipe and the skill of the welding work. An object of the present invention is to provide an inner circumference welding apparatus for a steel pipe and a flange pipe, which can efficiently perform welding work between a steel pipe such as a bent pipe and a branch pipe and a pipe flange, and can stabilize quality.

[0011]

SUMMARY OF THE INVENTION In an inner peripheral welding apparatus for a steel pipe and a flange pipe according to the present invention, a pipe flange is welded to a steel pipe such as a long bent pipe or a branch pipe by using a welding torch. Inner peripheral welding device for holding a welding torch, and holding and moving means for moving the welding torch along an inner peripheral welding portion between the steel pipe and the pipe flange.

Preferably, the holding / moving means includes a welding torch holding portion for holding the welding torch, a driving portion for supporting the welding torch holding portion and moving the welding torch along an inner circumferential welding point, and a driving portion. And a fixing portion for removably fixing to the pipe flange.

[0013] By adopting this configuration, the welding torch moves along the inner circumference welding portion between the steel pipe and the pipe flange, so that a continuous inner circumference welding operation can be realized, and the overlapping of the welding members can be realized. And the efficiency and stability of the welding operation can be improved.

Further, since the holding and moving means is fixed to the pipe flange, the inner peripheral welding between the steel pipe such as a long bent pipe and a branch pipe and the pipe flange can be performed without being limited by the size of the pipe flange. It can be realized.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an inner peripheral welding device for a steel pipe and a flange pipe according to an embodiment of the present invention will be described below with reference to the drawings.

First, the overall structure of the inner periphery welding apparatus 100 according to the present embodiment will be described. The inner peripheral welding device 100 relates to an inner peripheral welding device that forms an inner peripheral welding bead 3 in order to fix a pipe flange 1 at a predetermined position of a steel pipe 2 such as a long bent pipe and a branch pipe. In addition,
The formation of the outer periphery weld bead is performed in the same operation procedure as that of the related art, and a description thereof will be omitted.

(Schematic Configuration of Inner Peripheral Welding Apparatus 100) Referring to FIG. 1, the schematic configuration of this welding apparatus 100 is a flange forming a fixing mechanism for fixing the inner peripheral welding apparatus 100 to the pipe flange 1. A fixing block 102 and a chain tensioner 104; a main frame 105 on which the flange fixing block 102 and the chain tensioner 104 are provided at the lower end;
5, a sliding frame 106 that is slidably held in a direction intersecting with the axis of the steel pipe 2 (the direction of the arrow A in the figure), and a shaft of the steel pipe that is rotated by a drive motor 108 provided on the sliding frame 106. Frame 113 that rotates along a virtual plane intersecting with the torch frame 113,
A torch mount 116 movably supported along a direction (arrow B direction in the figure) intersecting the axis of
And an angle adjusting mechanism for adjusting the angle (in the direction of arrow D in the figure) of the welding torch 22 with respect to the inner circumferential welding point.
And a holding plate 120 supported by the torch mount 116 so as to be able to ascend and descend along.

(Structure of Flange Fixing Block 102) The flange fixing block 102 is provided with a concave portion as shown in FIG. 1, and a pipe flange 1 is inserted into this concave portion, and a handle provided at a lower end of the flange fixing block 102 is provided. 10
2a, the flange fixing block 1 is rotated.
The handle 102a rises based on the screwing action between the handle 02a and the handle 102a, and clamps the pipe flange 1. To release the clamping of the pipe flange 1, the handle 102a
Is rotated in the opposite direction.

(Detailed Configuration of Chain Tensioner 104) Next, a detailed configuration of the chain tensioner 104 will be described with reference to FIGS. The chain tensioner 104 includes a contact block 10 having a V-shaped groove 104b at a position where the chain tensioner 104 contacts the side surface of the pipe flange 1.
4a, one end of the chain 104c is fixed to a pivot 104d provided on one side of the contact block 104a, and the other end of the chain 104c is
Sliding block 104 provided on the other side of
g is fixed to the pivot 104h.

The sliding block 104g includes a handle 104
e, the screw portion 104f is
By screwing the handle 104e and rotating the handle 104e, the position of the sliding block 104g can be adjusted.

Therefore, in the case of the pipe flange 1 having a large diameter (contour indicated by 1A in the figure), the sliding block 104g
Is rotated so as to move in the E1 direction. In the case of a small-diameter pipe flange 1 (contour indicated by 1B in the figure), the handle 104e is rotated so that the sliding block 104g moves in the E2 direction. And chain 104
Adjust so that c does not loosen.

By using the sliding block 104g, the V-shaped groove 104b comes in contact with the side surface of the pipe flange 1 at two points. The center of the welding rotary shaft of the welding device 100 can be easily adjusted.

(Main frame 105 and sliding frame 1)
06) Next, the main frame 105 and the sliding frame 106 will be described with reference to FIG. The sliding frame 106 is provided with a guide rail 106b.
Along the guide rail 106b, the sliding frame 10
6 is held on the main frame 105 so as to be slidable in a direction intersecting with the axis of the steel pipe 2 (the direction of arrow A in the figure).

The positioning of the sliding frame 106 with respect to the main frame 105 is achieved by rotating a handle 106a of the sliding frame 106 in a predetermined direction (for example, a screw shaft and a block engaging with the screw shaft). (A mechanism using the screwing action).

(Mechanism for Rotating Torch Frame 113) Next, a mechanism for rotating the torch frame 113 will be described with reference to FIGS.
A pinion 108a is provided on the rotation shaft of the drive motor 108, and a driven gear 110 that meshes with the pinion 108a is further provided.

At the center of rotation of the driven gear 110, a rotating shaft 1
The other end of the rotating shaft 112 is connected to a torch frame 113. Therefore, the rotation of the drive motor 108 is converted into the rotation of the torch frame 113 about the rotation shaft 112 as the center of rotation.

Here, the rotation control of the torch frame 113 will be described with reference to FIGS. The driven gear 110 is provided with switch bars 111b and 111d.
N / OFF controlled limit switches 111a, 11
1c is provided.

The positions where the switch bars 111b and 111d and the limit switches 111a and 111c are provided are provided at positions shifted by α on the circumference of the driven gear 110 as shown in FIG.

FIG. 4A shows the arc start position, and ON / OFF control is confirmed by the switch 111a. The driven gear 110 starts rotating, and FIG.
As shown in (2), when the driven gear 110 rotates (1 rotation + α), the ON / OFF control is confirmed by the switch 111c, and the rotation of the driven gear 110 by the drive motor 108 is stopped.

As described above, the torch frame 113 is
By performing the control of (rotation + α) rotation, it is possible to form an overlapping region of the weld bead, and it is possible to realize a reliable welding operation.

(Mechanism of Torch Mount 116 and Holding Plate 120) Next, referring to FIGS. 1 and 5, the mechanism of the torch mount 116 and holding plate 120 will be described.

The direction in which the torch mount 116 intersects the axis of the steel pipe 2 of the torch frame 113 (the direction of arrow B in FIG. 5).
Is mounted so as to be slidable along a guide groove 113a provided in the rim. To position the torch mount 116 with respect to the torch frame 113, the torch frame 1
A mechanism realized by rotating the handle 114 of the thirteenth direction in a predetermined direction (for example, a mechanism using a screwing action of a screw shaft and a block engaged with the screw shaft) is employed.

At the lower end of the torch mount 116, a holding plate 120 is provided. This holding plate 1
20 has a base plate 121 and a welding torch holding plate 122. Welding torch holding plate 122
Is attached to the base plate 121 with the wing bolt 122a.
And the angle at which the welding torch 22 is opposed to the inner circumferential welding point (in the direction of arrow D in FIG. 5) can be easily adjusted. Also, when the welding torch 22 is clamped by the welding torch clamping plate 122, the wing bolts 122b and 122c are used, so that the welding torch 22 can be easily replaced.

In order to adjust the height of the welding torch 22, the base plate 12 is
The height of the base plate 121 with respect to the torch mount 116 is determined by rotating the handle 118 of the torch mount 116 in a predetermined direction. (For example, a mechanism that uses a screwing action of a screw shaft and a block that engages with the screw shaft).

As described above, in the inner peripheral welding apparatus 100 according to the present embodiment, the welding torch 22 rotates and moves along the inner peripheral welding portion between the steel pipe 2 such as the branch pipe and the branch pipe and the pipe flange 1. Therefore, a continuous welding operation can be realized, and it is possible to minimize the overlap of the inner peripheral bead 3 and to improve the efficiency of the welding operation.

Further, since the inner peripheral welding apparatus 100 is fixed to the pipe flange 1 by using the flange fixing block 102, the inner peripheral welding apparatus 100 is not limited to the size of the pipe flange 1 and can be used for a long bent pipe and a branch pipe. It is possible to realize inner circumferential welding between the steel pipe 2 and the pipe flange 1.

It should be noted that the embodiments disclosed this time are merely examples in all respects, and are not restrictive. The technical scope of the present invention is not defined by the above description but defined by the appended claims. It is intended that all modifications within the meaning and range equivalent to the claims are included.

[0038]

According to the inner peripheral welding apparatus for steel pipes and flange pipes based on the present invention, the welding torch is formed along the inner peripheral welding point between a steel pipe such as a long bent pipe and a branch pipe and the pipe flange. Because of the movement, it is possible to realize a continuous welding operation, and it is possible to minimize the overlap of the welding members and increase the efficiency of the welding operation.

Further, since the holding and moving means is fixed to the pipe flange, the inner peripheral welding between the steel pipe such as a long bent pipe and a branch pipe and the pipe flange can be performed without being limited by the size of the pipe flange. It can be realized.

[Brief description of the drawings]

FIG. 1 is a front view showing the entire structure of an inner circumference welding apparatus 100 according to the present embodiment.

FIG. 2 is a plan view showing a detailed configuration of a chain tensioner 104.

FIG. 3 is a schematic diagram showing a mechanism for rotating a torch frame 113.

FIGS. 4A and 4B are schematic diagrams for explaining rotation control of a driven gear 110 by a drive motor 108. FIGS.

FIG. 5 is a torch mount 116 and a holding plate 1;
It is a schematic diagram which shows the mechanism of No. 20.

FIG. 6 is a view showing an inner peripheral welding portion when a pipe flange is welded to a steel pipe.

7 is a partially enlarged view of a region surrounded by A in FIG.

FIG. 8 is a perspective view showing an apparatus for welding a pipe flange to a steel pipe.

FIG. 9 is a schematic view showing overlap of weld beads.

[Explanation of symbols]

1 pipe flange, 2 steel pipe, 3 inner circumference weld bead, 22
Welding torch, 100 inner circumference welding device, 102 flange fixing block, 102a handle, 104 chain tensioner, 104a contact block, 104b V-shaped groove, 104c chain, 104d pivot, 10
4g sliding block, 104h pivot, 104e handle, 104f screw, 105 main frame,
106 sliding frame, 106a handle, 106b
Guide rail, 108 drive motor, 108a pinion, 110 driven gear, 111a, 111c limit switch, 111b, 111d switch bar, 11
2 rotating shaft, 113 torch frame, 113a guide groove, 114 handle, 116 torch mount, 11
8 handle, 120 holding plate, 121 base plate, 122 welding torch holding plate, 122
a, 122b, 122c Butterfly bolt.

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[Procedure amendment]

[Submission date] October 5, 1999 (1999.10.
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Patent application title: Inner circumference welding device for large diameter steel pipe and pipe flange

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a welding device,
More specifically, a steel pipe and a pipe for welding a pipe flange to a steel pipe such as a long bent pipe and a branch pipe using a welding torch.
The present invention relates to an apparatus for welding an inner periphery to a flange .

[0002]

2. Description of the Related Art Conventionally, when a pipe flange is welded to a steel pipe such as a carbon steel pipe for piping, as shown in FIGS.
After positioning the pipe flange 1 at a predetermined position of the steel pipe 2,
The inner peripheral side and the outer peripheral side were welded, and the pipe flange 1 was fixed to the steel pipe 2. FIG. 7 is a partially enlarged view of a region surrounded by A in FIG.

[0003] Generally, the welded portion on the inner peripheral side is called an inner peripheral weld bead 3, and the welded portion on the outer peripheral side is called an outer peripheral weld bead 4. Such a welding operation is performed by a manual operation by an operator or an operation using a machine.

In operation using a machine, as shown in FIG. 8, a steel pipe 2 is rotated by a rotating device 10 having a rotating base 12.
To the torch 2
2 is held by using the fixing portion 20 so as to be opposed to an inner peripheral welding portion between the pipe flange 1 and the steel pipe 2. By rotating the rotation base 12 in a desired direction, the steel pipe 2 is rotated. A girth weld bead 3 is formed.

[0005]

However, the above-mentioned manual work or work using a machine has the following problems.

[0006] In the inner peripheral side welding of a long bent pipe, since it is impossible to rotate a steel pipe, work using a machine cannot be performed. Therefore, although manual work is required, in the case of this manual welding, skill is required to weld the inner circumferential bead (one round) once.

[0007] Further, since the welding operator performs the welding operation by manually moving the welding torch, a great deal of labor is required. For example, when a large-sized steel pipe is used, it takes about 30 to 40 minutes to perform the operation, and even a skilled person needs patience to continuously weld the inner circumferential bead once at one round.

[0008] Therefore, when welding is performed by dividing the circumference of the inner bead, the welding members overlap (lap welding,
As shown in FIG. 9), the overlap is inevitable and
Since many are formed, welding defects are likely to occur. As a result, rework after inspection is required.

On the other hand, in the case of work using a machine, there has been a problem that only straight or deformed pipes of a limited length can be welded.

Accordingly, an object of the present invention is to provide a long bent pipe and an inner peripheral welding work for welding a pipe flange to a steel pipe such as a branch pipe, regardless of the size of the pipe and the skill of the welding work. An object of the present invention is to provide an inner circumference welding apparatus for a steel pipe and a pipe flange , which can efficiently perform welding work between a steel pipe such as a bent pipe and a branch pipe and a pipe flange, and can stabilize quality.

[0011]

SUMMARY OF THE INVENTION In an inner peripheral welding apparatus for a steel pipe and a pipe flange according to the present invention, a pipe flange is welded to a steel pipe such as a long bent pipe or a branch pipe using a welding torch. Inner peripheral welding device for holding a welding torch, and holding and moving means for moving the welding torch along an inner peripheral welding portion between the steel pipe and the pipe flange.

Preferably, the holding / moving means includes a welding torch holding portion for holding the welding torch, a driving portion for supporting the welding torch holding portion and moving the welding torch along an inner circumferential welding point, and a driving portion. And a fixing portion for removably fixing to the pipe flange.

[0013] By adopting this configuration, the welding torch moves along the inner circumference welding portion between the steel pipe and the pipe flange, so that a continuous inner circumference welding operation can be realized, and the overlapping of the welding members can be realized. And the efficiency and stability of the welding operation can be improved.

Further, since the holding and moving means is fixed to the pipe flange, the inner peripheral welding between the steel pipe such as a long bent pipe and a branch pipe and the pipe flange can be performed without being limited by the size of the pipe flange. It can be realized.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an inner peripheral welding device for a steel pipe and a pipe flange in an embodiment according to the present invention will be described below with reference to the drawings.

First, the overall structure of the inner periphery welding apparatus 100 according to the present embodiment will be described. The inner peripheral welding device 100 relates to an inner peripheral welding device that forms an inner peripheral welding bead 3 in order to fix a pipe flange 1 at a predetermined position of a steel pipe 2 such as a long bent pipe and a branch pipe. In addition,
The formation of the outer periphery weld bead is performed in the same operation procedure as that of the related art, and a description thereof will be omitted.

(Schematic Configuration of Inner Peripheral Welding Apparatus 100) Referring to FIG. 1, the schematic configuration of this welding apparatus 100 is a flange forming a fixing mechanism for fixing the inner peripheral welding apparatus 100 to the pipe flange 1. A fixing block 102 and a chain tensioner 104; a main frame 105 on which the flange fixing block 102 and the chain tensioner 104 are provided at the lower end;
5, a sliding frame 106 that is slidably held in a direction intersecting with the axis of the steel pipe 2 (the direction of the arrow A in the figure), and a shaft of the steel pipe that is rotated by a drive motor 108 provided on the sliding frame 106. Frame 113 that rotates along a virtual plane intersecting with the torch frame 113,
A torch mount 116 movably supported along a direction (arrow B direction in the figure) intersecting the axis of
And an angle adjusting mechanism for adjusting the angle (in the direction of arrow D in the figure) of the welding torch 22 with respect to the inner circumferential welding point.
And a holding plate 120 supported by the torch mount 116 so as to be able to ascend and descend along.

(Structure of Flange Fixing Block 102) The flange fixing block 102 is provided with a concave portion as shown in FIG. 1, and a pipe flange 1 is inserted into this concave portion, and a handle provided at a lower end of the flange fixing block 102 is provided. 10
2a, the flange fixing block 1 is rotated.
The handle 102a rises based on the screwing action between the handle 02a and the handle 102a, and clamps the pipe flange 1. To release the clamping of the pipe flange 1, the handle 102a
Is rotated in the opposite direction.

(Detailed Configuration of Chain Tensioner 104) Next, a detailed configuration of the chain tensioner 104 will be described with reference to FIGS. The chain tensioner 104 includes a contact block 10 having a V-shaped groove 104b at a position where the chain tensioner 104 contacts the side surface of the pipe flange 1.
4a, one end of the chain 104c is fixed to a pivot 104d provided on one side of the contact block 104a, and the other end of the chain 104c is
Sliding block 104 provided on the other side of
g is fixed to the pivot 104h.

The sliding block 104g includes a handle 104
e, the screw portion 104f is
By screwing the handle 104e and rotating the handle 104e, the position of the sliding block 104g can be adjusted.

Therefore, in the case of the pipe flange 1 having a large diameter (contour indicated by 1A in the figure), the sliding block 104g
Is rotated so as to move in the E1 direction. In the case of a small-diameter pipe flange 1 (contour indicated by 1B in the figure), the handle 104e is rotated so that the sliding block 104g moves in the E2 direction. And chain 104
Adjust so that c does not loosen.

By using the sliding block 104g, the V-shaped groove 104b comes in contact with the side surface of the pipe flange 1 at two points. The center of the welding rotary shaft of the welding device 100 can be easily adjusted.

(Main frame 105 and sliding frame 1)
06) Next, the main frame 105 and the sliding frame 106 will be described with reference to FIG. The sliding frame 106 is provided with a guide rail 106b.
Along the guide rail 106b, the sliding frame 10
6 is held on the main frame 105 so as to be slidable in a direction intersecting with the axis of the steel pipe 2 (the direction of arrow A in the figure).

The positioning of the sliding frame 106 with respect to the main frame 105 is achieved by rotating a handle 106a of the sliding frame 106 in a predetermined direction (for example, a screw shaft and a block engaging with the screw shaft). (A mechanism using the screwing action).

(Mechanism for Rotating Torch Frame 113) Next, a mechanism for rotating the torch frame 113 will be described with reference to FIGS.
A pinion 108a is provided on the rotation shaft of the drive motor 108, and a driven gear 110 that meshes with the pinion 108a is further provided.

At the center of rotation of the driven gear 110, a rotating shaft 1
The other end of the rotating shaft 112 is connected to a torch frame 113. Therefore, the rotation of the drive motor 108 is converted into the rotation of the torch frame 113 about the rotation shaft 112 as the center of rotation.

Here, the rotation control of the torch frame 113 will be described with reference to FIGS. The driven gear 110 is provided with switch bars 111b and 111d.
N / OFF controlled limit switches 111a, 11
1c is provided.

The positions where the switch bars 111b and 111d and the limit switches 111a and 111c are provided are provided at positions shifted by α on the circumference of the driven gear 110 as shown in FIG.

FIG. 4A shows the arc start position, and ON / OFF control is confirmed by the switch 111a. The driven gear 110 starts rotating, and FIG.
As shown in (2), when the driven gear 110 rotates (1 rotation + α), the ON / OFF control is confirmed by the switch 111c, and the rotation of the driven gear 110 by the drive motor 108 is stopped.

As described above, the torch frame 113 is
By performing the control of (rotation + α) rotation, it is possible to form an overlapping region of the weld bead, and it is possible to realize a reliable welding operation.

(Mechanism of Torch Mount 116 and Holding Plate 120) Next, referring to FIGS. 1 and 5, the mechanism of the torch mount 116 and holding plate 120 will be described.

The direction in which the torch mount 116 intersects the axis of the steel pipe 2 of the torch frame 113 (the direction of arrow B in FIG. 5).
Is mounted so as to be slidable along a guide groove 113a provided in the rim. To position the torch mount 116 with respect to the torch frame 113, the torch frame 1
A mechanism realized by rotating the handle 114 of the thirteenth direction in a predetermined direction (for example, a mechanism using a screwing action of a screw shaft and a block engaged with the screw shaft) is employed.

At the lower end of the torch mount 116, a holding plate 120 is provided. This holding plate 1
20 has a base plate 121 and a welding torch holding plate 122. Welding torch holding plate 122
Is attached to the base plate 121 with the wing bolt 122a.
And the angle at which the welding torch 22 is opposed to the inner circumferential welding point (in the direction of arrow D in FIG. 5) can be easily adjusted. Also, when the welding torch 22 is clamped by the welding torch clamping plate 122, the wing bolts 122b and 122c are used, so that the welding torch 22 can be easily replaced.

In order to adjust the height of the welding torch 22, the base plate 12 is
The height of the base plate 121 with respect to the torch mount 116 is determined by rotating the handle 118 of the torch mount 116 in a predetermined direction. (For example, a mechanism that uses a screwing action of a screw shaft and a block that engages with the screw shaft).

As described above, in the inner peripheral welding apparatus 100 according to the present embodiment, the welding torch 22 rotates and moves along the inner peripheral welding portion between the steel pipe 2 such as the branch pipe and the branch pipe and the pipe flange 1. Therefore, a continuous welding operation can be realized, and it is possible to minimize the overlap of the inner peripheral bead 3 and to improve the efficiency of the welding operation.

Further, since the inner peripheral welding apparatus 100 is fixed to the pipe flange 1 by using the flange fixing block 102, the inner peripheral welding apparatus 100 is not limited to the size of the pipe flange 1 and can be used for a long bent pipe and a branch pipe. It is possible to realize inner circumferential welding between the steel pipe 2 and the pipe flange 1.

It should be noted that the embodiments disclosed this time are merely examples in all respects, and are not restrictive. The technical scope of the present invention is not defined by the above description but defined by the appended claims. It is intended that all modifications within the meaning and range equivalent to the claims are included.

[0038]

According to the inner circumference welding apparatus for steel pipes and pipe flanges based on the present invention, a welding torch can be formed along the inner circumference welding point between a steel pipe such as a long bent pipe and a branch pipe and the pipe flange. Because of the movement, it is possible to realize a continuous welding operation, and it is possible to minimize the overlap of the welding members and increase the efficiency of the welding operation.

Further, since the holding and moving means is fixed to the pipe flange, the inner peripheral welding between the steel pipe such as a long bent pipe and a branch pipe and the pipe flange can be performed without being limited by the size of the pipe flange. It can be realized.

[Brief description of the drawings]

FIG. 1 is a front view showing the entire structure of an inner circumference welding apparatus 100 according to the present embodiment.

FIG. 2 is a plan view showing a detailed configuration of a chain tensioner 104.

FIG. 3 is a schematic diagram showing a mechanism for rotating a torch frame 113.

FIGS. 4A and 4B are schematic diagrams for explaining rotation control of a driven gear 110 by a drive motor 108. FIGS.

FIG. 5 is a torch mount 116 and a holding plate 1;
It is a schematic diagram which shows the mechanism of No. 20.

FIG. 6 is a view showing an inner peripheral welding portion when a pipe flange is welded to a steel pipe.

7 is a partially enlarged view of a region surrounded by A in FIG.

FIG. 8 is a perspective view showing an apparatus for welding a pipe flange to a steel pipe.

FIG. 9 is a schematic view showing overlap of weld beads.

[Description of Signs] 1 pipe flange, 2 steel pipe, 3 inner circumference weld bead, 22
Welding torch, 100 inner circumference welding device, 102 flange fixing block, 102a handle, 104 chain tensioner, 104a contact block, 104b V-shaped groove, 104c chain, 104d pivot, 10
4g sliding block, 104h pivot, 104e handle, 104f screw, 105 main frame,
106 sliding frame, 106a handle, 106b
Guide rail, 108 drive motor, 108a pinion, 110 driven gear, 111a, 111c limit switch, 111b, 111d switch bar, 11
2 rotating shaft, 113 torch frame, 113a guide groove, 114 handle, 116 torch mount, 11
8 handle, 120 holding plate, 121 base plate, 122 welding torch holding plate, 122
a, 122b, 122c Butterfly bolt.

Claims (3)

[Claims] 1. An inner peripheral welding apparatus for welding a steel pipe and a flange pipe to a steel pipe such as a long bent pipe and a branch pipe using a welding torch, wherein the welding torch is held. And an inner peripheral welding device for a steel pipe and a flange pipe, comprising: holding and moving means for moving the welding torch along an inner peripheral welding point between the steel pipe and the pipe flange. 2. The holding and moving unit includes: a welding torch holding unit that holds the welding torch; a driving unit that supports the welding torch holding unit and moves the welding torch along the inner circumference welding location; The inner peripheral welding device for a steel pipe and a flange pipe according to claim 1, further comprising: a fixing part for detachably fixing the part to the pipe flange. 3. The welding torch holding device includes a holding plate for holding the welding torch, and the holding plate has an angle adjustment mechanism for adjusting an angle of the welding torch facing the inner circumferential welding point. An inner peripheral welding apparatus for a steel pipe and a flange pipe according to claim 2.