JPS6116948Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe welding device for welding a right-angled elbow to one or both ends of a pipe.

[Prior art]

Conventionally, when attaching an elbow to the end of a pipe, a thread is cut and the elbow is attached by threaded engagement.

[Problem that the invention attempts to solve]

However, in such conventional devices, screw engagement may cause leakage of the liquid inside, and when attaching by welding, it is necessary to align the pipe and elbow in the axial direction and in the direction perpendicular to the axis. It was difficult to maintain the groove dimensions accurately, requiring temporary attachment, which was time-consuming, and even then, there was a risk of defects.

The present invention eliminates the above-mentioned drawbacks of the conventional one, and allows the right-angled elbow to be accurately aligned with the pipe.
Provides an easy-to-use and reliable pipe welding machine that can perform automatic welding while accurately and easily regulating the groove dimensions, and can perform defect-free and reliable welding without tacking. The purpose is to

[Means for solving problems]

The present invention includes a pipe support that rotatably supports a pedestal for fixing a pipe, and an elbow support that supports a right-angled elbow to be welded to the pipe; an elbow gripping tool that rotates coaxially with the rotational axis of and grips the elbow, and a gap provided so as to be reciprocatable in a direction toward the rotational axis within a plane perpendicular to the rotational axis. a regulating plate and a welding torch; the elbow gripping tool includes an axis parallel to the rotation axis;
an elbow holder and an elbow positioning plate whose distance from the rotational axis is adjustable and are perpendicular to each other; a clamp for fixing the elbow; This pipe welding device is characterized by being provided with a rotation drive mechanism for synchronous rotation.

〔Example〕

Embodiments of the present invention will be described using the drawings.

In FIGS. 1 to 5, the pipe support 1 and the elbow supports 7 and 8 are the rails 3 on the foundation 6.
4 by a known means such as a cylinder or a rack (not shown), and is arranged so as to be fixed at any position. 4 is a motor, a pipe support 1, elbow supports 7, 8;
These supports are driven by rotating a drive shaft 5 that passes through them. Among these supports, the pinions 35 and 36 receive the power from the drive shaft 5 as described later, but in order to transmit power even when each support moves, a spline shaft or a square cross-section shaft is used. Power transmission is performed by known means.

First, the pipe support 1 will be explained.

In the pipe support 1, a guide ring 30 is rotatably supported by a ring 38 fixed to a frame 37 via a bearing 31 such as a rolling bearing about the rotation axis 3. guide ring 30
A gear 39 is provided to mesh with the pinion 36. The inner diameter of the ring 30 is set large enough so that the elbowed pipe can be pulled out after welding.

A pedestal 27 is fixed inside the guide ring 30, and a clamp pedestal 3 is mounted on the pedestal 27 near both ends.
2, 33 and clamps 25, 26 are provided, and the pipe 2 is clamped and fixed therebetween. The clamp supports 40 and 41 are mounted on the pedestal 27 at substantially diagonal positions. The heights of the clamps 25, 26 and the clamp stands 32, 33 from the pedestal 27 can be adjusted using screws or other known means, and even if the pipes 2 have various diameters, their centers can be aligned with the rotation axis 3. It is designed so that it can be fixed in place.

The pipe 2 fixed on the pedestal 27 in this manner can be rotated about the rotation axis 3 which coincides with the central axis of the pipe by driving the drive shaft 5.

Next, the elbow supports 7 and 8 will be explained.
Since both supports have the same structure, the elbow support 7 will be explained.

In the elbow support 7, the rotating shaft 13 is connected to a ring 43 fixed to a frame 42 via a bearing 44.
is rotatably supported around a rotation axis 3. A gear 45 is attached to one end of the rotating shaft 13 and meshes with the pinion 35.

At the other end of the rotating shaft 13 is a pedestal 1 on which the elbow 9 is placed.
1 is installed. A positioning plate 15 is provided on the pedestal 11 to regulate the position of the elbow 9 in the direction perpendicular to the axis.

The positioning plate 15 has a known structure such as a screw adjustment or a dovetail groove slide so as to move in a direction perpendicular to the axis and adjust the distance from the rotation axis 3 according to the size of the elbow 9, and has one end of the elbow 9. Positioning plate 15
The center of the other end coincides with the rotation axis 3.

The pedestal 11 can also be moved in a direction perpendicular to the rotation axis 13 by a known mechanism such as screw adjustment or sliding with a dovetail groove, so that the distance from the rotation axis 3 can be adjusted, and the center height of the elbow 9 can be rotated. It is arranged to coincide with the axis 3.

Both the pedestal 11 and the positioning plate 15 include axes parallel to the rotation axis 3, and are arranged at right angles to each other.

Reference numeral 46 denotes a clamp support, which supports the clamp 23 so as to be movable up and down using known means such as screws, and clamps and fixes the elbow 9.

cradle 11, positioning plate 15, clamp support 4
6, the clamp 23, and the rotating shaft 13 form an elbow gripping tool.

The elbow 9 fixed on the pedestal 11 in this manner can be rotated about the rotation axis 3 that coincides with the central axis of the elbow 9 by driving the drive shaft 5.

The elbow support 7 includes a gap regulation plate moving tool 19 that reciprocates a gap regulation plate 17 that regulates the groove root interval in the direction perpendicular to the axis, and a welding torch 21 such as an inert gas solid wire arc welding method that reciprocates in the direction perpendicular to the axis. A welding torch moving tool 28 is provided. The gap regulating plate 17 and the welding torch 21 are capable of reciprocating within one plane perpendicular to the rotation axis 3 in a direction toward the rotation axis.

The elbow support 8 has a structure similar to that of the elbow support 7. 10 is an elbow, 12 is a support, 1
Reference numeral 4 denotes a rotating shaft, 16 denotes a positioning plate, 18 denotes a gap regulating plate, 20 denotes a gap regulating plate moving tool, 22 denotes a welding torch, 24 denotes a clamp, and 19 denotes a welding torch moving tool.
47 is a frame, 48 is a ring, 49 is a bearing, 5
Reference numeral 0 denotes a gear, 51 denotes a clamp support, and 52 denotes a pinion.

Therefore, the pipe support 1, the elbow support 7,
8 pinions 36, 35, 52 and gears 39, 4
5 and 50 have the same tooth ratio, and the pinions 36, 35, and 52 are driven by the same drive shaft 5, so the pedestal 27 and the elbow gripper are rotated synchronously, and the pipe 2 and elbows 9, 10 are adapted to rotate synchronously about one rotation axis 3 that coincides with their central axes.
That is, the drive shaft 5, pinions 36, 35, 52, gears 39, 45, 50, bearings 31, 44, 49, etc. form a rotational drive mechanism that causes the pedestal 27 and the elbow gripper to rotate synchronously.

In operation, first, the gap regulating plates 17, 1
8 above the rotation axis 3, and welding torches 21, 2
2 is retracted, place the elbows 9 and 10 on the cradle 11,
12 (The position in the direction perpendicular to the axis is adjusted in advance according to the size of the elbows 9 and 10.) Positioning plate 1
5, 16 (the position has been adjusted in advance according to the length of the end in the direction perpendicular to the axis of the elbows 9, 10) and the gap regulating plates 17, 18 to regulate the three directions and determine the position. It is fixed with clamps 23 and 24. The elbow support 8 is placed at a position slightly apart from the final position.

When installing the pipe 2 on the pedestal 27,
Using the large inner diameter D of the ring 30, the pipe 2
is inserted from an oblique direction as shown by the two-dot chain line 3A in FIG. 1, and rotated in a horizontal plane to place the pipe 2 almost parallel to the rotation axis as shown by the solid line in FIG. At this time, since the clamp supports 40 and 41 are provided substantially diagonally on the pedestal 27, there is no problem at all with horizontal rotation of the pipe 2.

Next, the pipe 2 is slid in the axial direction, and with its tip touching the gap regulating plate 17, it is held and set by the clamps 25 and 26. Thereafter, the elbow support 8 is moved closer by a cylinder drive or the like, and the elbow support 8 is set at a position where the gap regulating plate 18 contacts the end surface of the pipe 2. To set the pipe 2, the pipe 2 is supported in the pipe support 1 in an axially free state, and the elbow support 8 with the elbow 10 attached is brought close to the right end of the pipe 2 using the gap regulating plate 18. , and at the position where the left end of the pipe 2 hits the gap regulating plate 17, the pipe 2 may be held in the pipe support 1 so as to be restrained in the axial direction, and the elbow support 8 may be fixed. .

Next, the gap regulating plates 17 and 18 are retracted and removed from between the elbows 9 and 10 and the pipe 2. The elbows 9, 10 and the end faces of the pipe 2 are provided with grooves of a desired shape having a desired groove angle θ, as shown in FIG. 6, for example. A required root spacing t equal to the plate thickness is maintained. This state is the state shown in FIG. 7, and then the welding torches 21, 22 are advanced so that their tips face the groove as shown in FIG.

Next, the welding device is energized and the welding torches 21, 22
starts welding, starts the motor 4, rotates the drive shaft 5, rotates the elbows 9, 10 and the pipe 2 synchronously on the rotation axis 3, and
Weld along the circumference as shown in the figure.

After completing one rotation and welding the entire circumference, the motor 4 is stopped, the welding torch is retracted, and the clamp 23,
24, 25, and 26, move the elbow support 8 to the right if necessary, and take out the pipe 2.

The series of operations described above can be performed automatically by sequence control or program control, or manual operations such as fine adjustments can be made at important points as necessary.

Since this embodiment is configured and operates as described above, it can produce the following excellent effects.

(1) Reliable welding with few defects can be performed. That is, when welding a right-angled elbow to the end of a pipe, it is not possible to weld from the back side, so one-sided automatic welding must be performed using uranami welding or the like.
In this case, the dimensional accuracy of the groove must be high, and in particular, the root spacing must be set accurately. In the conventional method, the root spacing was inaccurate, but in this embodiment, since the gap regulating plates 17 and 18 are set between them, the root spacing is accurate, and reliable single-sided automatic back wave welding can be performed.
Furthermore, by replacing the gap regulating plates 17 and 18 with ones having different thicknesses, a root spacing of the required dimension can be obtained.

Since the elbows 9, 10 and the pipe 2 rotate synchronously while maintaining the same relative positions, the welding operation itself can be stabilized and reliable welding can be performed.

(2) Since one elbow support 8 can be set by moving in the axial direction, it can be applied to pipes 2 of various lengths.

(3) By adjusting the distance of the cradle 11, 12 from the rotation axis 3 and the height of the clamp pedestal 32, 33, it is possible to accommodate elbows of different diameters, and to Positioning becomes easy.

(4) By adjusting the positions of the positioning plates 15 and 16, elbows of different lengths can be accommodated.

(5) Gap regulation plates 17, 18 and welding torches 21, 2
2 are attached to the elbow supports 7 and 8, so even if the lengths of the pipes 2 are different, there is no need to adjust the positions between them, and the welding torch can always be placed in the center of the groove.

(6) Since the rotations of the elbows 9, 10 and the pipe 2 are synchronized, there is no need for temporary attachment and defects in the welded portion are reduced.

etc.

With this invention, welding can be performed automatically on one side with fewer defects while accurately maintaining the dimensions of the groove, such as the root spacing of the groove and the parallelism of the groove surfaces, and without the need for tacking. Uranami welding is possible, making the work easier and increasing the reliability of the product.Also, the right-angled elbow can be easily aligned in both the axial and perpendicular directions with respect to the rotation axis of the pipe. It is possible to provide a pipe welding device that can be applied to right-angled elbows of various sizes and whose length can be easily adjusted when elbows are provided at both ends, and has extremely great practical effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a cross-sectional plan view of only the pipe support, FIG. 2 is a vertical cross-sectional front view, and FIGS. 3, 4, and 5 are cross-sectional views.
6 is an explanatory diagram of the groove, and FIGS. 7, 8, and 9 are partial plane views showing the operating process. 1...Pipe support, 2...Pipe, 3...Rotation axis, 4...Motor, 5...Drive shaft, 6...Foundation stand, 7, 8...Elbow support, 9, 10... Elbow, 11, 12... pedestal, 13, 14... rotating shaft, 15, 16... positioning plate, 17, 18...
Gap regulation plate, 19, 20...Gap regulation plate moving tool,
21, 22...Welding torch, 23, 24, 25,
26...clamp, 27...cradle, 28, 29...
...Welding torch moving tool, 30...Guide ring, 3
1...Bearing, 32, 33...Clamp stand, 34...
...Rail, 35 ... Pinion, 37 ... Frame, 38 ... Ring, 39 ... Gear, 40 ... Clamp support, 42 ... Frame, 43 ... Ring, 44 ... Bearing, 45 ... Gear, 46 ... Clamp support, 47 ... Frame, 48 ... Ring,
49...bearing, 50...gear, 51...clamp support, 52...pinion.

Claims (1)

[Scope of utility model registration request] A pipe support that rotatably supports a pedestal for fixing a pipe; and an elbow support that supports a right-angled elbow to be welded to the pipe; an elbow gripper that rotates around the same axis as the rotation axis and grips the elbow; and a gap regulating plate that is provided to be reciprocatable in a direction toward the rotation axis within a plane perpendicular to the rotation axis and welded to the elbow gripper. a torch; the elbow gripping tool includes an axis parallel to the rotational axis, the distance from the rotational axis is adjustable, and an elbow cradle and an elbow positioning plate that are perpendicular to each other; A pipe welding device comprising: a clamp for fixing the elbow; and a rotation drive mechanism for synchronously rotating the pedestal and the elbow gripper.