JPH08323471A - Automatic circumferential welding equipment - Google Patents

Abstract

PURPOSE: To improve execution efficiency in laying a pipe etc., by reducing the auxiliary working time and the welding time. CONSTITUTION: With a notch of the holder 7 adjusted to the notch provided on the upper end of a frame body 3, a pipe 10b to be welded is inserted from above the frame body 3. The frame body 3 and the pipe 10b are fixed by clamp cylinders 4. With the holder 7 rotated 180 degrees each time along the frame body 3, a weld joint 19 is divided left and right centering on the vertical direction by two sets of welding equipment 8a, 8b installed oppositely facing at an angle of 180 degrees apart; and then, downward welding or upward welding is performed using the two sets of welding equipment 8a, 8b alternately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circumferential automatic welding device for automatically welding circumferential joints of horizontally fixed pipes, and more particularly to improvement of welding work efficiency.

[0002]

2. Description of the Related Art In the case where the circumferential joint portion of a horizontally fixed pipe such as a gas main pipe is welded all around, as shown in FIG. 6, the circumferential joint portions of the pipes 10a and 10b to be joined are first joined. 19
An annular guide rail 20 is fixed in the vicinity, and a traveling carriage 21 equipped with the welding device 8 is attached to the fixed guide rail 20. Next, while the welding device 8 is running along the guide rails 20, various welding conditions are set to adjust the welding line profile and the torch height to repeat the upward welding and the downward welding, and the circumferential joint. The entire circumference of the portion 19 was continuously welded from the first layer to the final layer.

[0003]

As described above, the pipe 10 is used.
When the circumferential joints 19 of a and 10b are welded all around, the work of fixing the annular guide rail 20 near the circumferential joint 19 and the work of attaching the traveling carriage 21 to the guide rails 20 are easy. It took a lot of time. Further, while welding the traveling carriage 21 while continuously traveling around the pipe along the guide rail 20, a welding current cable and control for supplying welding current to the welding device 8 from an external power supply device. Since the cable was wrapped around the pipe, it took a lot of time to carry out these countermeasures. Further, when continuously performing the upward welding and the downward welding, it is necessary to change the welding conditions such as the torch moving time, and the adjustment thereof is not easy. For this reason, the auxiliary work time is longer than the time when the arc is actually generated.

The present invention has been made to solve the above disadvantages, and an object of the present invention is to obtain an automatic circumference welding apparatus capable of shortening the welding time and improving the work efficiency of pipe laying and the like. Is.

[0005]

An automatic circumference welding apparatus according to the present invention has a frame body, a clamp cylinder, an R guide, an R rail, a holder, a welding device, and a rotary drive section. -The main body is formed in an arc shape having a notch larger than the outer diameter of the pipe to be welded to the upper end, the lower end is attached to the support frame, and the surface has a plurality of guide rollers provided along the arc. However, the clamp cylinder is designed so that the clamp head at the tip faces the center of the arc of the frame body.
The R guide is attached to a plurality of places on the back surface of the frame body, the R guide has an arcuate guide mechanism, and is attached to a plurality of places on the lower end of the frame body surface, and the R rail is larger than the outer diameter of the pipe to be welded. It has a notch, is formed in an arc shape following the arc of the frame body, has guide grooves on the inner and outer peripheral surfaces that engage with the guide mechanism of the R guide, and the holder has a notch of the R rail. Has a notch part of the same size as that of the R rail, is formed in an arc shape following the arc of the R rail, is provided with a gear tooth profile on the outer peripheral surface, and is attached to the surface of the R rail. The rotary drive unit is mounted 180 degrees apart from the target position across the notch, and the rotary drive unit is a drive gear that meshes with the gear tooth profile on the outer peripheral surface of the holder and a drive motor that is mounted on the support frame and rotates the drive gear. And having.

[0006]

In the present invention, the pipe to be joined from the upper portion of the frame body is inserted with the notch portion of the holder aligned with the notch portion provided at the upper end of the frame body. The pipe to be joined inserted into the frame body is aligned with the existing pipe, and then the frame body and the vicinity of the end of the pipe to be joined are fixed by the clamp cylinder.

When welding a welded joint, the holder is rotated by 180 degrees along the frame main body by the rotary drive unit, and is welded by two sets of welding devices provided facing each other at an angle of 180 degrees. Divide the joint part left and right centering on the vertical direction,
Perform downward welding or upward welding by alternately using two sets of welding devices.

[0008]

1 and 2 show an embodiment of the present invention. FIG. 1 is a front view and FIG. 2 is a side sectional view. As shown in the drawing, the automatic circumference welding apparatus 1 includes a support base 2 having a movable base 2a which can be finely adjusted in an X direction which is a pipe axis direction, a Y direction which is orthogonal to the pipe axis direction and a Z direction which is a vertical direction. Mounted frame body 3, clamp cylinder 4, and R guide 5
And R rail 6, holder 7, welding device 8 and rotation drive unit 9
Have and. The frame body 3 is a pipe 10 welded to the upper end.
It is formed in an arc shape having a notch portion having a width D larger than the outer diameter d of, and the lower end portion is attached to the support base 2. On the left and right of the surface of the frame body 3, a plurality of pair of guide rollers 11 provided along an arc are provided.
A plurality of, for example, three clamp cylinders 4 are attached to the back surface of the above so that the clamp heads 4a at the tip end face the center of the arc of the frame body 3. The R guides 5 are attached at the lower end of the surface of the frame body 3 and on both sides separated from the lower end by a constant angle α. The R guide 5 has an arcuate guide mechanism on its inner surface, for example, a slide guide or a rolling guide having a steel ball as shown in the sectional view of FIG. When the rolling guide is provided, the angle α at which the R guide 5 is attached is 1/2 or less of the angle β of the cutout portion of the frame body 3, for example, the cutout portion of the frame body 3. If the angle β of is 90 degrees, the angle α is 40
Determined in degrees.

The R rail 6 is formed in an arc shape following the arc of the frame body 3 and has a notch larger than the outer diameter of the pipe 10 to be welded, for example, the same size as the notch of the frame body 3. 3 and a guide groove 6a that engages with the guide mechanism of the R guide 5 is provided on the inner and outer peripheral surfaces as shown in FIG. This R
The rail 6 is mounted on the R guide 5 so that it can be rotated and moved along the R guide 5 and the guide roller 11. The surface of the R rail 6 is formed in an arc shape following the arc of the R rail 6 and has a cutout portion of the same size as the cutout portion of the R rail 6 and the entire outer peripheral surface. A holder 7 provided with a gear tooth profile is attached. Two sets of welding devices 8 are placed at the target position sandwiching the notch of the holder 7 and at an angle of 180 degrees apart.
a and 8b are attached. Each of the welding devices 8a and 8b has a welding torch 13 attached to the position adjusting device 12. The rotary drive unit 9 has a drive gear 14 that meshes with the gear tooth profile of the outer peripheral surface of the holder 7, and a drive motor 15 that is attached to the support base 2 and rotates the drive gear 14.

The operation of welding the pipe 10 to be laid by, for example, the propulsion method using the circumferential automatic welding apparatus 1 constructed as described above will be described.

As shown in FIG. 4, an automatic circumferential welding device 1 is installed in the vicinity of the propulsion side of the starting shaft 16 so that the center of the frame body 3 coincides with the axial center of the propelling pipe 10. Then, the drive motor 15 of the automatic circumferential welding apparatus 1 is driven to rotate the holder 7, and the notches of the R rail 6 and the holder 7 are cut into the frame body 3 as shown in FIG. The pipe 10 to be hung down is inserted into the frame body 3 through the notch so as to coincide with the notch. In this state, the preceding pipe 10a is propelled by the pushing jack 17, and then the pipe 10b joined to the propelled pipe 10a is hung on the starting shaft 16 and joined to the pipe 10a propelled by the pipe receiving roller 18. Perform centering of.

In this way, when the pipe 10 is hung down, it can be hung down to a predetermined position through the notches of the frame body 3, the R rail 6 and the holder 7. It is possible to suspend the pipe 10 without any trouble even if it is installed in advance in the starting shaft 16. Further, when the holder 7 is rotated, the R rail 6 is moved to the frame main body 3
Since it is guided and rotated by the R guide 5 and the plurality of guide rollers 11 attached to the holder 7, the holder 7 can accurately follow the frame body 3 and smoothly rotate.

After centering the pipe 10b to be joined with the propelled pipe 10a, the clamp cylinder 4 provided in the frame body 3 is driven by a hydraulic device or a pneumatic device (not shown) to form the frame body 3 10b for joining the welded joint 19 and its vicinity
Fixed to. In this way, the clamp head 4a of the clamp cylinder 4 is moved forward by simply moving the clamp head 4a onto the pipe 10b.
Since the frame body 3 is fixed, the frame body 3 can be accurately fixed to the tube 10b in a short time.

After that, the movable base 2a of the support base 2 is finely adjusted to accurately align the end of the pipe 10b joined with the end of the propelled pipe 10a. After the welding joint portion 19 is accurately aligned, the drive motor 15 is driven to rotate the holder 7 counterclockwise to move one welding device 8a to the welding joint portion 19 as shown in FIG. Move to the zenith at 12 o'clock. In this state, welding is started by the welding device 8a, and the holder 7 is rotated clockwise while the welding joint 1
Weld half of 9 round. When the welding device 8a reaches the lowest end position of the welding joint portion 19 at 6 o'clock, welding by the welding device 8a is stopped, and welding is started by the welding device 8b moved to the 12 o'clock position which is the zenith of the welding joint portion 19. Then, the other half of the circumference of the welded joint portion 19 is welded while rotating the holder 7 counterclockwise. This operation is repeated to weld the welded joint portion 19 in multiple layers.

When welding the welded joint portion 19 in this way, the holder 7 to which the welding devices 8a and 8b are attached is alternately rotated about 180 degrees clockwise and counterclockwise, so that the welding devices 8a and 8b are supplied with an external power source. It is possible to prevent a welding current cable, a control cable, or the like, which supplies a welding current from the apparatus, from wrapping around the pipes 10a and 10b, so that welding can be smoothly performed. Further, even when performing multi-layer welding, for example, when welding is performed by one welding device 8a, the welding conditions of the other welding device 8b can be set to be suitable for the next welding, so that continuous welding is possible. Welding can be done on. Further, since the welded joint portion 19 is distributed to the left and right and the entire welded joint portion 19 is welded by the downward welding having a short arc time,
Compared with the conventional welding in which the downward welding and the upward welding are repeated, the time for welding the pipe 10 having the same diameter can be significantly shortened.

Further, when the holder 7 is alternately rotated clockwise and counterclockwise by about 180 degrees, when the R guide 5 for guiding the rotation of the holder 7 has a rolling guide, the mounting angle α of the R guide 5 is set. Is an angle equal to or less than 1/2 of the angle β of the cutout portion of the frame body 3, for example, the frame.
If the angle β of the notch in the main body 3 is 90 degrees, the angle α is
Since it is set to about 40 degrees, even if the holder 7 is rotated about 180 degrees in the clockwise direction and the counterclockwise direction by about 180 degrees, the R guide 5 moves to the R ray
Therefore, the steel balls of the rolling guide provided in the R guide 5 can be prevented from popping out.

When the welding of the pipes 10a and 10b is completed as described above, the holder 7 is rotated to move the welding devices 8a and 8b to the horizontal position as shown in FIG. -The notch of the ruler 6 is arranged at the upper end, and then the clamp cylinder 4 is retracted to disconnect the pipe 10b and the frame body 3 from each other. The above operation is repeated again after propelling the tube 10b.

In the above embodiment, the welding joint portion 19 is distributed and downward welding is performed, but the welding joint portion 19 may be distributed and upward welding is performed. Further, in the above-mentioned embodiment, the case where the pipe 10a and the pipe 10b are butt-welded has been described. However, when the pipe 10b joined to the sleeve provided at the rear end of the preceding pipe 10a is fillet-welded, H The same can be applied by changing the mounting angle.

[0019]

As described above, the present invention is a frame-free system.
Since the pipe to be joined from the top of the frame body is inserted with the notch of the holder aligned with the notch provided on the upper end of the frame body, an automatic circumferential welding device is installed in advance in the starting shaft. You can hang the pipe without any trouble.

Further, since the pipe to be joined inserted into the frame body is aligned with the existing pipe, the frame body and the vicinity of the end of the pipe to be joined are fixed by the clamp cylinder. The frame body can be fixed accurately in a short time, and the auxiliary work time can be greatly shortened.

Further, when welding the welded joint portion, two sets of welding devices are provided so that the holder is rotated 180 degrees along the frame main body by the rotation drive portion at an angle of 180 degrees so as to face each other. The welding joint is divided into left and right with the vertical direction as the center, and two sets of welding equipment are alternately used to perform downward welding or upward welding. Therefore, the welding current is supplied from the external power supply to the welding equipment. It is possible to prevent a cable, a control cable or the like from being wrapped around the pipe, and to perform welding smoothly.

Furthermore, when welding the entire circumference of the pipe, it is possible to set the welding conditions because welding is performed either downward welding or upward welding without repeating downward welding and upward welding. Welding can be done in a short time.

When the holder is rotated, the R rail attached to the holder is guided and rotated by the R guide attached to the frame body and a plurality of guide rollers. It is possible to perform accurate welding and to rotate smoothly, and to perform stable welding.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side sectional view of the above embodiment.

FIG. 3 is a partial cross-sectional view showing an R guide and an R rail.

FIG. 4 is a side view showing the operation of the above embodiment.

FIG. 5 is a front view showing an operation state of the above embodiment.

FIG. 6 is a side view showing a conventional example.

[Explanation of symbols]

 1 Automatic Circumferential Welding Device 2 Supporting Stand 3 Frame Main Body 4 Clamp Cylinder 5 R Guide 6 R Rail 7 Holder 8 Welding Device 9 Rotation Drive Unit 10 Pipe 11 Guide Roller 12 Position Adjusting Device 13 Welding Torch 14 Drive gear 15 Drive motor

Claims (1)

[Claims] 1. A frame main body, a clamp cylinder, an R guide, an R rail, a holder, a welding device, and a rotary drive section, wherein the frame main body has a larger cutting diameter than the pipe outer diameter to be welded to the upper end. It is formed in an arc shape with a notch, the lower end is attached to the support base, and the surface has a plurality of guide rollers provided along the arc, and the clamp cylinder has a clamp head at the tip of the frame body. The R guide is attached to a plurality of positions on the back surface of the frame body so as to face the center of the arc, and the R guide has an arc-shaped guide mechanism and is attached to a plurality of places on the lower end of the surface of the frame body. Has a notch larger than the outer diameter of the pipe to be welded,
It is formed in an arc shape that follows the arc of the frame body, and has a guide groove on the inner and outer peripheral surfaces that engages with the guide of the R guide, and the holder has a notch part of the same size as the notch part of the R rail Is formed in a circular arc shape following the circular arc of the R rail, has gear teeth on the outer peripheral surface, and is attached to the surface of the R rail. Position 180
The rotary drive unit has a drive gear that is mounted at a distance from each other and meshes with a gear tooth profile on the outer peripheral surface of the holder, and a drive motor that is mounted on a support frame and rotates the drive gear. Welding equipment.