JP2617058B2 - Inner surface welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can easily adjust the spiral angle of a row of welding nozzles consisting of a plurality of welding nozzles, the position perpendicular to the pipe axis, and the position in the longitudinal direction of the weld seam when changing the size in manufacturing spiral steel pipes. The present invention relates to an inner surface welding device in a spiral steel pipe manufacturing facility that can be adjusted while adjusting.

[0002]

2. Description of the Related Art As disclosed in Japanese Patent Publication No. Sho 63-58674, 1) A plurality of sets of a welding nozzle and a core wire feeder which are moved in the pipe axis direction are provided. The welding head equipped with the welding unit is supported and moved by a telescopic beam that is expanded and contracted by a telescopic drive device. When moving, the electric cable of each driving motor attached to the holding part, the welding core wire There are problems such as the guide and the welding power supply cable being extremely bent or entangled, or being pinched between the welding head and the telescopic beam. The welding head must be moved while correcting bending, pinching, entanglement, etc., of the welding core wire guide and the like, and automatic operation was impossible at all.

[0003] 2) The welding nozzle forming angle adjusting device changes the angles of the plurality of welding nozzles by driving the spiral angle changing rotary base, which holds the plurality of welding nozzles, with the spiral angle changing drive device. During the change, the welding core wire feeding device is fixed and the angle of only the welding nozzle changes, so that the core wire guide between the core wire feeding device and the welding nozzle is twisted, the linearity is lost, and the welding core wire feeding becomes unstable.

The diameter of the welding power supply cable connected to supply power to the welding nozzle is about 40 mm. If the length is short, there is no flexibility, the resistance is large, and the angle of the welding nozzle is changed. However, the welding nozzle often did not move, forcing manual intervention. Although it is conceivable to increase the power of the motor for adjusting the forming angle, it is not possible to install a large motor in the narrow installation space of the welding head, and if the power cable is twisted or bent with excessive force, As a result, the motor itself was damaged, and there was such a problem, and the power of the electric motor could not be increased.

Further, since a plurality of welding nozzles are collectively held on the spiral angle changing rotary base, even if the forming angle of the welding nozzle is adjusted, the position in the longitudinal direction of the pipe slightly shifts, and the forming angle is reduced. After the adjustment, it was necessary to adjust the position in the longitudinal direction of the tube axis again.

[0006] 3) In the off-center adjusting device in the horizontal direction orthogonal to the longitudinal direction of the pipe axis of the welding nozzle, a plurality of welding nozzles are moved in the horizontal direction of the pipe cross section by a lateral movement driving device.
At the time of movement, the welding core wire feeding device is fixed and only the welding nozzle moves in the left-right direction of the pipe cross section, so that the linearity of the core wire guide is lost and the feeding of the welding core wire becomes unstable.

Further, the resistance of the welding power supply cable connected to supply power to the welding nozzle is large, and the welding nozzle often does not move, so that manual intervention has to be performed.
Also, as described in the forming angle adjustment device, it is conceivable to increase the power of the motor for lateral movement, but it is not possible to install a large motor in the narrow installation space of the welding head, and the power supply cable is If the cable is twisted or bent, the power supply cable itself will be damaged, and there is such a problem, and the power of the electric motor cannot be increased.

[0008]

As described above, in the case of an inner surface welding apparatus in a conventional spiral steel pipe manufacturing facility, when the size of the steel pipe is changed, the spiral angle of the welding nozzle row is changed, and When changing the horizontal position orthogonal to the pipe axis or changing the welding position (pitch) in the longitudinal direction of the pipe axis, power is supplied to the welding core guide and welding nozzle attached to the welding nozzle. Poor followability of electric cables and pipes of cables, welding core wire feeding and feeding motives, motors for welding nozzle adjustment, etc.
As a result, every time the adjustment was performed, the adjustment work had to be performed manually.

In addition, since the welding device is installed in the steel pipe, it takes a long time to adjust the position of the welding nozzle in a narrow space for the operator and the working environment is poor. It was difficult to adjust. Due to such a problem, the operation rate of the steel pipe production line is poor, and it is necessary to secure workers for adjustment.

The present invention has been devised to solve the above problems, and a main object of the present invention is to provide an inner surface welding apparatus for a spiral steel pipe manufacturing facility capable of fully automatically adjusting the positions of a plurality of welding nozzles by remote control. To provide.

[0011]

SUMMARY OF THE INVENTION This invention has been made and an object thereof is to provide an inner surface welding equipment in favorable resolution and spiral steel pipe manufacturing equipment of the aforementioned problems, it is an aspect of this invention, (1) and welding nozzle, equipped with a welding head a plurality of sets of welding unit comprising a core supply apparatus for supplying a wire to the welding nozzle, provided to be movable in the axial direction of the tube at the distal end of the support beam, the welding unit Traverse in the direction perpendicular to the pipe axis
A horizontal moving device for supplying power to the welding nozzle.
A feed busbar is slidably provided in the support beam, and
Connect the sbar and welding nozzle with a flexible strand wire.
Connecting a flexible bus bar configured with yer, (2) Then, the inner surface welding apparatus of the present invention, the welding nozzle and welding head having a plurality of sets of welding unit comprising a core supply apparatus for supplying a wire to the welding nozzle Is provided at the tip of the support beam so as to be movable in the pipe axis direction, and a plurality of welding units are laterally moved in a direction orthogonal to the pipe axis in a transverse direction, and each welding unit is individually moved in the pipe axis direction. And a vertical moving device for a single welding unit .

[0012]

( 1 ) A power supply bus bar for supplying power to the welding nozzle is slidably provided in the support beam, and the bus bar and the welding nozzle are connected by a flexible bus bar formed of a flexible strand wire. Even if the nozzle is moved in the tube axis direction or moved laterally in a direction perpendicular to the tube axis direction, it can be absorbed by the feed bus bar slidable in the tube axis direction, and the lateral movement can be absorbed by bending the flexible bus bar. For this reason, in the conventional flexible power supply cable having a diameter of 40 mm, the resistance of the power supply cable was large, the welding nozzle often did not move, and the conventional problem that manual intervention had to be performed could be solved.

( 2 ) A welding head lateral moving device for horizontally moving a plurality of welding units as a whole in a direction orthogonal to the pipe axis, and a single welding unit moving device for individually moving each welding unit in the pipe axis direction. Since it is provided, the forming angle can be easily adjusted with respect to the welding line.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall schematic view of the present invention, FIG. 2 is a detailed view of a part a of FIG. 1 and a perspective view of a tube shaft independent moving device, FIG. 3 is a detailed view of a part b of FIG. FIG. 4 is a schematic view of connection of a core wire guide, a power supply cable and an electric cable, FIG. 5 is a detailed view of a welding head, FIG. 6 is a detailed view of a flexible bus bar, and FIG.
Is a detailed view of a core wire guide tube having a sliding double pipe structure, and FIG. 8 is a detailed view of a connecting rod for moving a welding head.

1, 2 and 3, the structure of the present invention is as follows.
A welding head 3 is provided with three sets of welding units each including three welding nozzles 1 and three core wire supply devices 2 for supplying a core wire to the welding nozzles. The welding head is capable of simultaneously moving three sets of welding units vertically in the tube axis direction and horizontally in a direction perpendicular to the tube axis. First, the vertical movement of the welding head is moved in the pipe axis direction by a welding head vertical moving device 7 which pushes and pulls the connecting rod through a connecting rod 6 connected to the welding head 3. The welding head 3 is mounted on a welding head vertical moving slide base 23, and the welding head slide base can slide on the tip (not shown) of the support beam in the tube axis direction.

Next, as shown in FIG. 3, the welding head is moved laterally by driving the welding head laterally moving slide base 25, on which three sets of welding units are mounted, by the motor 12 for lateral movement. The welding head laterally moving slide base 25 moves laterally on the welding head vertical moving slide base 23.

As shown in FIG. 2, the three welding units of the welding head 3 can be independently moved in the pipe axis direction. In FIG. 2, reference numeral 25 denotes a horizontal slide base for the welding head, 35 a single vertical slide base for vertically moving on the horizontal slide base, 15 a motor for single vertical movement for vertically moving the slide base, and 13 a welding base. The nozzle clamping device clamps and fixes the welding nozzle when welding, and can release the clamping of the welding nozzle when moving the welding unit. 14
Is a driving pneumatic cylinder for the welding nozzle clamping device, and 2 is a core wire supply device for supplying a core wire to the welding nozzle.

As described above, in the welding head portion, a vertical moving device for vertically moving the welding head in the tube axis direction, a horizontal moving device 11 for horizontally moving in the direction perpendicular to the tube axis, and three sets of welding units. The three types of operations can be performed by the independent vertical movement devices 16 which individually vertically move in the pipe axis direction.

The welding head includes a core guide tube 18 for supplying a core wire to the welding nozzle, a power supply bus bar 19 for supplying electricity for welding to the welding nozzle, a drive motor (not shown) for the core wire supply device, and a motor for independent vertical movement. 15 and an electric cable for supplying electricity to the motor 12 for lateral movement, and an air pipe for the pneumatic cylinder of the clamp device are connected.

First, as shown in FIG. 4, the core wire is provided from the straight pack 21 storing the core wire provided on the right side of the support beam to the core wire guide tube 9, the core wire guide tube double tube 10, the core wire guide tube 18, the core wire. Supply device 2
And then supplied to the welding nozzle. In the case of the vertical movement of the welding head and the vertical movement of the welding unit alone, the core wire guide tube double tube 10 expands and contracts, and it is not necessary to bend the core wire halfway by the movement amount, and the core wire can be passed straight through the support beam. Therefore, the core wire can be supplied smoothly and stably.

Next, the power supply for welding is connected to the bus bar 17 from the welding power supply cable 22 on the right outside of the support beam, and the bus bar 17 is supported by the bus bar support roller 29 in the support beam so that the bus bar 17 can be slidably moved. The moving amount is absorbed by being bent by the welding power supply cable 22 connected to the outside of the support beam. When the welding head is moved laterally, it is connected to the welding nozzle by the flexible bus bar 19, so that the flexible nozzle is bent by the flexible bus bar 19. For this reason, problems such as the inability to move each mobile device and the breakage of the power supply cable, which were problems with the conventional power supply cable having little flexibility, have been completely eliminated.

The power supply cable to the motor of each moving device and the air pipe for the clamp pneumatic cylinder are flexible cables and flexible hoses, and absorb the welding head movement between the electric cable junction terminal box 20 and the right outside of the support beam. It is deflected as much as possible, and is connected through a hollow portion of the connecting rod 6 for moving the welding head provided in the support beam to the motor for each moving device provided on the welding head and the pneumatic cylinder for clamping. The flexible cable and the flexible hose are bent on the welding head side of the connecting rod so as to be able to absorb the moving amount of the horizontal movement of the welding head and the single vertical movement of the welding unit.

FIG. 6 is a detailed view of the flexible bus bar 19, which uses a flat braided copper wire between both connecting portions. FIG. 7 is a detailed view of the core wire guide tube double tube 10 which is slidable and threaded so that both ends can be connected to the core wire guide tube 9. FIG.
Is a detailed view of the connecting rod 6 for moving the welding head, which has a hollow cylindrical shape and houses about 20 electric cables and air pipes.

FIG. 5 is a detailed view of the welding head.
7 shows the connection between the flexible busbar 7 and the core wire guide tubes 9 and 18. FIG. 5 shows a method of aligning the welding nozzle with the welding line 30,
The pitch adjustment 32 is performed by vertical movement of the welding head, the offset adjustment 33 is performed by horizontal movement of the welding head, and the forming angle adjustment 31 is performed by vertical movement of the welding unit alone. The above adjustment amount is about ± 300 mm for pitch adjustment amount and 0 to 40 mm for offset adjustment amount.
In general, the adjustment amount of the forming angle is about ± 20 mm.

[0025]

According to the present invention, when the size of a steel pipe is changed, the necessary three-directional position adjustment of pitch adjustment, forming angle adjustment and off-center adjustment can be easily and quickly performed without human intervention by remote control. The effect that adjustment work can be performed is obtained. Further, the breakage of the power cable such as bending and entanglement of the power cable and abrasion of the cable coating layer can be eliminated, and troubles such as the inability of the welding head to move due to the bent or entangled cable can be solved. This eliminates the need for manual intervention to prevent and correct the cable from being bent or entangled. Further, conventionally, the guide tube is bent in order to absorb the moving amount. However, the guide tube is not required to be bent.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram of the present invention.

FIG. 2 is a perspective view of the tube shaft independent moving device, which is a detailed view of section a in FIG. 1;

FIG. 3 is a perspective view of a welding unit lateral moving device in a detailed view of a portion b in FIG. 1;

FIG. 4 is a schematic diagram of connection between a core wire guide, a power supply cable, and an electric cable.

FIG. 5 is a detailed view of a welding head.

FIG. 6 is a detailed view of a flexible bus bar.

FIG. 7 is a detailed view of a core wire guide tube having a sliding double pipe structure.

FIG. 8 is a detailed view of a connecting rod for moving a welding head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding nozzle 2 Core wire feeder 3 Welding head 4 Support beam tip 5 Support beam 6 Welding head moving connecting rod 7 Welding head vertical moving device 8 Power cable (electric cable) 9 Core wire guide tube 10 Core wire guide tube double tube 11 Welding Head horizontal moving device 12 Horizontal moving motor 13 Welding nozzle clamp device 14 Pneumatic cylinder 15 Single vertical moving motor 16 Welding unit single vertical moving device 17 Bus bar 18 Core wire guide tube 19 Flexible bus bar 20 Electric cable relay terminal box 21 Straight pack 22 Welding power supply cable 23 Welding head vertical movement slide base 24 Core wire feeding motor 25 Welding head horizontal movement slide base 26 Support beam wheel 27 Spiral steel pipe 28 Strip 29 Bus bar support roller 30 Welding line 3 Forming angle adjustment 32 pitch adjustment 33 offset adjustment 34 welding wire 35 alone vertical movement slide base

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazunori Harada 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Plant Design Co., Ltd. Sho-61-97373 (JP, U) JP-B Sho-63-58674 (JP, B2)

Claims (2)

(57) [Claims] A welding head having a plurality of sets of welding units each comprising a welding nozzle and a core feeder for supplying a core to the welding nozzle is provided at the tip of the support beam so as to be movable in the tube axis direction. A transverse movement device for transversely moving the unit in a direction orthogonal to the pipe axis is provided, and a power supply bus bar for supplying power to the welding nozzle is slidably provided in the support beam, and the bus bar and the welding nozzle are connected to a flexible strand. An inner surface welding device characterized by being connected by a flexible bus bar made of wire. 2. A welding head on which a plurality of sets of welding units each comprising a welding nozzle and a core wire supplying device for supplying a core wire to the welding nozzle is provided at a tip of a support beam so as to be movable in a tube axis direction. The welding head is provided with a welding head lateral moving device for horizontally moving the entire welding unit in a direction orthogonal to the pipe axis, and a welding unit single vertical moving device for individually moving each welding unit in the pipe axis direction. Internal welding equipment.