JP3007951B2 - Spiral steel pipe 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 relates to a spiral steel pipe inner surface welding apparatus capable of quickly responding to a change in size during the manufacture of a spiral steel pipe and capable of finely adjusting each welding torch remotely.

[0002]

2. Description of the Related Art When changing the size of a steel pipe in a spiral steel pipe manufacturing facility, as described in JP-B-63-58674, the spiral angle of a welding nozzle row composed of welding nozzles provided at the tips of a plurality of welding torches is known. It is necessary to adjust the position in the front-back direction with respect to the pipe axis and the position in the longitudinal direction of the welding seam. In the above publication, a welding head mounted with a plurality of sets of welding units each including a welding nozzle and a core wire supply device moved in the front-rear direction with respect to the pipe axis is supported by a telescopic beam that is telescopically driven by a telescopic drive device. There has been proposed an inner surface welding apparatus for a spirally moving steel pipe.

[0003]

However, in the inner surface welding apparatus described in the above-mentioned publication, the electric cables, welding wire guides, and welding power supply cables of the driving motors attached to the holding portion are extremely reduced when moving. Bend,
There are problems such as entanglement and pinching between the welding head and the telescopic beam.When moving the welding head, always monitor the worker and bend, pinch, or entangle the electric cables and welding wire guide. It is necessary to move the welding head while making corrections and the like, and automatic operation is difficult.

Further, the spiral angle of the welding nozzle is changed because the angle of the welding core wire supply device is fixed and the angle of only the linear welding torch is changed. Is lost, and the feeding of the welding core wire is not stable. And, the diameter of the welding power supply cable connected to supply power to the welding torch is about 40 mm, there is no flexibility at short length, even if the resistance is large and the angle of the welding torch is to be changed, The welding torch often did not move, requiring manual intervention. Further, since a plurality of welding torches are collectively held by the spiral angle changing rotary base, even if the forming angle of the welding torch is adjusted, the position in the longitudinal direction of the tube axis is slightly shifted, and after the forming angle is adjusted, It was necessary to adjust the position in the longitudinal direction of the tube axis.

In addition, since the wire feeder and the like are installed in the steel pipe, the work is performed in a narrow space and the working environment is poor. It was difficult to adjust the position.
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 made in view of such circumstances, and it is possible to remotely control the position of a plurality of welding torches, and furthermore, a wire feeding device and a device for controlling the position and angle of the welding torch can be relatively maintained and inspected at the rear. It is an object of the present invention to provide a spiral steel pipe inner surface welding apparatus which can be arranged at an easy place, which can improve operability and can be automated.

[0006]

According to the present invention, there is provided an apparatus for welding an inner surface of a spiral steel pipe according to the present invention, comprising: an intermediate support frame; and a plurality of sets of welding torches provided at a front portion of the intermediate support frame so as to be movable back and forth. A welding head mounting frame provided, a rear frame movably disposed at the rear of the intermediate support frame, a connection rod connecting the rear frame and the welding head mounting frame, and the connection rod connected by the connection rod. Reciprocating drive means for moving the welding head mounting frame and the rear frame in the front-rear direction with respect to the intermediate support frame, and connecting a welding torch guide pipe extending to the rear frame to each of the welding torches. The welding torch is fixed and power is supplied to the welding torch through the respective welding torch guide pipes. An inner surface welding device for a spiral steel pipe that supplies a welding wire to the welding torch through the welding torch guide pipe; And a welding torch guide pipe connected to the torch tilting angle adjusting device for rotating the welding torch guide pipe on the rear frame so that the welding torch clamp device can rotate and move back and forth when the clamp device is opened. The rear frame is further provided with a torch longitudinal movement adjusting device for adjusting the relative position of the welding torches in the longitudinal direction.

Here, in the spiral steel pipe inner surface welding apparatus according to the present invention, the welding head mounting frame is provided with the welding torch clamping device and the elevating device, and the connecting rod is a hollow shaft. It is also possible to wire a power supply cable for the clamp device and the lifting device inside the hollow shaft. Further, in the inner surface welding apparatus for a spiral steel pipe according to the present invention, a dome-shaped cover connected to the intermediate support frame is disposed above the welding head mounting frame, and the welding head mounting frame is provided on a side portion of the cover. Can be provided.

[0008]

The inner surface welding apparatus for a spiral steel pipe according to the present invention is provided with a welding head mounting frame and a rear frame movably in the front-rear direction before and after the intermediate support frame, and these are connected by connecting rods, and are moved by a reciprocating drive means. Since it is possible to move back and forth, the welding torch mounted on the welding head mounting frame is moved back and forth by operating the forward / backward drive means, whereby the overall welding position can be adjusted. Therefore, if necessary, the forward / backward drive means can be operated to make the nozzle at the tip of the welding torch follow the welding seam. Further, since the welding torch guide pipe and the rear frame are integrated, a necessary device for driving the welding torch can be mounted on the rear frame. Since each welding torch portion provided on the welding head mounting frame is connected and fixed to a welding torch guide pipe extending to the rear frame, a welding wire supply device is arranged on the rear frame, and the welding torch is provided. The welding wire can be supplied from the rear of the guide pipe. In this case, since the welding wire supply device is provided on the rear frame, maintenance and inspection are facilitated, and further, the front welding unit is simplified. Since power is supplied to the welding torch through the welding torch guide pipe, a special power supply cable is eliminated, and furthermore, the welding torch guide pipe also serves as a wire guide for sending a welding wire. Is simplified.

Further, since the torch inclination adjusting device for rotating the welding torch guide pipe is provided on the rear frame, the inclination of the welding torch attached to the front side of the welding torch guide pipe can be adjusted. it can. Also, since the torch longitudinal movement adjusting device for determining the relative position of each welding torch in the longitudinal direction is provided in the rear frame, the relative positions in the longitudinal direction of the plurality of devices are provided in the rear frame. It can be carried out. Furthermore, since these are provided on the rear frame, maintenance and inspection are easy.

Further, when the welding head mounting frame is provided with a welding torch elevating device, the welding torch can be adjusted up and down and a welding torch clamping device is provided. The welding torch can be fixed to the welding head mounting frame. And since these power supply cables are wired inside the hollow connecting rod, there is no need for special wiring ducts, etc., which simplifies the device and reduces the size and size of the device. Can be easily handled.

When a dome-shaped cover is provided on the upper part of the welding head mounting frame, the penetration of the scale from the upper part into the welding unit including the welding torch and the breakage of the welding unit due to the penetration of the arc from the outer surface welding are prevented. And the collision of the strip with the welding unit can be prevented. Since the guide member of the welding head mounting frame is provided on the side of the cover, the welding head mounting frame can be reliably moved in the front-rear direction, and the cover is used as a support for the guide member. Therefore, the structure can be simplified.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 1 is a perspective view of a spiral steel pipe inner surface welding apparatus according to one embodiment of the present invention, FIG. 2 is a schematic explanatory view thereof, and FIGS. 3 to 9 are partial perspective views of the same.

As shown in FIGS. 1 to 8, an inner surface welding apparatus 10 for a spiral steel pipe according to an embodiment of the present invention is provided at a center intermediate support frame 11 and before and after the intermediate support frame 11. A welding head mounting frame 12 and a rear frame 13 and a connecting rod 14 for connecting them;
15, a welding unit 19 including first to third welding torches 16 to 18 mounted on the welding head mounting frame 12 and its accompanying devices, and the first to first mounting units mounted on the rear frame 13. 3 welding torches 16-18
Torch inclination adjusting devices 20 to 22 and torch longitudinal movement adjusting devices 23, 24 of the first and third welding torches 16, 18.
And Hereinafter, these will be described in detail.

The intermediate support frame 11 is shown in FIGS.
As shown in the figure, the auxiliary equipment necessary for forming the spiral steel pipe 25 (for example, the power cylinder 2 for adjusting the forming angle)
6. L-side push-down rod 2 with roller attached at the bottom
7 and the R-side pressing rod 28, the pressing balance rod 29,
(For example, an inner surface servo valve stand 30). A support frame 32 provided on both sides with a copying guide 31 of the rear frame 13 is fixed to a rear portion of the intermediate support frame 11, and a dome-shaped (semicircular cross-section) cover 33 covering the welding unit 19 is provided at a front portion. Is provided. Note that FIG. 1 shows a state in which it protrudes from the dome-shaped cover 33, and maintenance and inspection are performed in this state.

As shown in FIG. 3 and FIG.
Guide rails 34 and 35 are provided on both inside sides of the welding head, and the welding head mounting frame 12 is mounted by the guide rails 34 and 35 so as to be able to move back and forth via upper and lower guide rollers 34a. As shown in FIG. 2, the intermediate support frame 11 is provided with two through holes 36, and the rear frame 13 and the welding head mounting frame 12 are attached to the copying guide 31 so as to be movable back and forth.
The two connecting rods 14 and 15 for connecting the two are loosely fitted in the through holes 36. Further, the intermediate support frame 11
A hydraulic cylinder 37, which is an example of an advance / retreat driving means, is attached to the hydraulic cylinder 37. The end of an advance / retreat rod 38 of the hydraulic cylinder 37 is fixed to the rear frame 13, and the hydraulic cylinder 3
As the 7 expands and contracts, the front and rear welding head mounting frames 12 and the rear frame 13 move back and forth simultaneously with respect to the intermediate support frame 11.

As shown in FIGS. 3 and 4, the welding head mounting frame 12 has first to third welding torches 16-1.
8 is provided, a flux supply device 39 is provided in front of the first welding torch 16 and a third welding torch 18 is provided.
A hopper 40 for collecting used flux is provided at the back of the hopper. During welding (submerged arc welding), welding is performed while supplying the flux from the flux supply device 39, and the hopper 40 for collection at the back of the powder remains. The state flux is collected by vacuum suction.
The pipes 41 and 42 connected to the flux supply device 39 and the flux recovery hopper 40 are piped to the rear frame 13 through the side of the intermediate support frame 11, and are connected to a flux transport unit and a recovery unit (not shown). Have been.

The first to third welding torches 16
The guide pipes 43 to 45 for welding torch
Are connected via conductive joints 46 to 48, and the welding torch guide pipes 43 to 45 pass through the intermediate support frame 11 with a sufficient gap, and are connected to the rear frame 13 shown in FIG. It extends to the welding wire supply devices 49 to 51 in an electrically insulated state, acts as a guide pipe for a plurality or a single welding wire, and also serves as a conductor for supplying a welding current to the respective welding torches 16 to 18. ing. In addition, since welding voltage is applied to the welding torch guide pipes 43 to 45 during welding, it is preferable to provide an insulating cover on exposed portions.

Guide pipes 43 to 45 for the welding torch
Are respectively provided with clamp devices 52 at the front end of the device. The clamping device 52 has a tapered upper wedge 53 and a lower wedge 54 that slide as shown in FIG. 5, and the hydraulic cylinder 55 for clamping moves the lower wedge 54 forward and backward to press the upper wedge 53 upward. The respective welding torch guide pipes 43 to 45 which are insulated and held by the insulating cylinder 56 are independently clamped, and the first to third welding torches 16 attached to the tips of the welding torch guide pipes 43 to 45 are attached. -18 are prevented from rotating and moving forward and backward.

Further, the guide pipe 43 for the welding torch is provided.
The clamp devices 52 to 45 are mounted on a common base plate 57, and a sliding upper and lower wedge 58 and a lower wedge 59 are provided at the lower portion of the common base plate 57 so as to slide. A male screw 60 is screwed into the lower wedge 59, and the male screw 60 is driven by a drive motor 61 to move the lower wedge 59 up and down.
The clamp device 52 mounted on the common base plate 57 is moved up and down so that the welding torches 16 to 18 are simultaneously moved up and down, thereby forming a welding torch lifting device 62a. The lower wedge 59 for lifting is provided with a striker 62 of a limit switch, and the upper and lower limits of the welding torches 16 to 18 are determined by limit switches (not shown) provided before and after.

As shown in FIG. 6 to FIG.
3, the torch inclination adjusting device 20 (21, 21)
22) is a pin 65 on a tilt arm 63 for holding the welding torch guide pipe 43 and a slide piece 64 provided at the tip of the tilt arm 63 so as to be extendable and contractible.
And an electric worm jack 66 that is rotatably connected via a. Since the first and third torch tilt adjusting devices 20 and 22 are separated, the second torch tilt adjusting device 21 is located at the same position on the rear frame 13 as shown in FIG. Rear frame 1 as shown
3 and the basic configuration is the same. And each torch inclination adjusting device 20 ~
By separately driving each of the electric worm jacks 66, the welding torch guide pipes 43 to 4 are provided.
5 to 1 to 3 welding torches 1 attached to the front side
6 to 18 can be tilted independently.

At the rear of the torch inclination adjusting devices 20 to 22, welding wire supply devices 49 to 51 are attached, respectively. The welding wire supply devices 49 to 51 are provided with a single wire (in the case of a single wire) into which a welding wire is inserted. ) Or a plurality of (in the case of a plurality of wires) pairs of upper and lower rollers, and variable speed motors 49a to 51a for rotating one or both of the rollers, and are not shown at a constant controlled speed. The welding wire is taken out from the wire supply source and supplied to the first to third welding torches 16 to 18 through the welding torch guide pipes 43 to 45. The welding wire supply devices 49 to 51 and the torch tilt angle adjustment devices 20 to 22 are respectively independent gantry 6
7 to 69, the pedestal 68 is attached to the rear frame 1
3 is fixed via an insulating member.
7, 69 are attached to moving bases 70, 71 via insulating members, and the moving bases 70, 71 are attached to the rear frame 13 so as to be movable in the front-rear direction via guide members arranged on both sides, respectively. I have.

The lower part of the moving bases 70 and 71 is shown in FIG.
As shown in FIG.
Are mounted respectively, and the nut 7 for the ball screw is mounted.
2 is screwed into a ball screw 74 with a deceleration motor 73 attached to the base end, and by moving each deceleration motor 73, the moving bases 70 and 71 advance and retreat,
This results in the first and third welding torch 1
The torch longitudinal movement adjusting devices 23 and 24 are constituted by the longitudinal movement of the torch 6 and 18.

A gate-shaped support member 74a is provided at the front of the rear frame 13, and connectors 75 to 77 for welding current supply are provided on the support member 74a in an insulated state. Rotary joints 81 to 83 are provided on the front cylindrical portions 78 to 80 of the connectors 75 to 77, and the rotary joints 81 to 83 and the welding torch guide pipes 43 to 83 are provided.
45 are connected to each other by air-cooled secondary cables 84 to 86 made of slightly longer strand wires.
The rotary joints 81 to 83 are provided with torch inclination adjusting devices 20 to 2.
If the welding torch guide pipes 43 to 45 are twisted by the use of 2, the secondary cables 84 to 86 are prevented from rotating and being subjected to excessive force. In addition, it is also possible to provide a rotary joint at the connection part of the welding torch guide pipes 43 to 45, and in this case, fixed wiring can be used for the secondary cable. In the drawing, reference numeral 87 denotes a relay terminal box, 88 denotes a welding power source, and 89 denotes an inner welded portion of a spiral steel pipe.

Therefore, the spiral steel pipe inner surface welding apparatus 10 has the first to third welding torches 16 to 18, and is designed to cope with the size change of the spiral steel pipe to be manufactured.
When the entirety of the three welding torches 16 to 18 is moved, the hydraulic cylinder 37 is expanded and contracted, and the first and third welding torches 16 and 18 are set based on the second welding torch 17.
Is individually moved by releasing the clamp device 52 and activating the torch longitudinal movement adjusting devices 23 and 24. Then, the first to third welding torches 16
In order to raise and lower the entirety of 18, the lifting device 62a is driven. Thereby, the distance between the nozzles 16a to 18a of the welding torches 16 to 18 and the workpiece can be changed.

Also, the first to third welding torches 16 to 18
Is changed by operating the respective torch inclination adjusting devices 20 to 22 with the clamp device 52 released. By the above operation, the first to third welding torches 16 are set according to the size of the spiral steel pipe.
Since it is possible to change the size of the steel pipe, a rotary encoder is attached to each motor, and a linear sensor (moving distance meter) is provided in a linearly moving portion (for example, a portion driven by the hydraulic cylinder 37). In addition, the operation procedure and the movement position are registered in advance, and the whole can be automatically controlled in connection with the control of the spiral steel pipe manufacturing facility.

In the above embodiment, three welding torches are used, but the present invention is applicable to two or more welding torches. Also, the welding method was submerged arc welding using a flux, but other arc welding methods may be used. In this case, the shield gas may be supplied by a separate pipe, or the welding torch may be used. A guide pipe may be used. Further, the welding torch elevating device raises and lowers all the welding torches at the same time, but may be performed individually.

[0027]

According to the inner surface welding apparatus for a spiral steel pipe according to the present invention, the welding head mounting frame and the rear frame at the front and rear of the intermediate support frame can be moved back and forth by the forward and backward driving means. The welding torch is moved back and forth, thereby adjusting the overall welding position. Therefore, if necessary, the forward / backward drive means can be operated to follow the entire welding torch along the welding seam. In addition, since the welding torch guide pipe and the rear frame are connected by a connecting rod to be integrated, a necessary device for driving the welding torch can be mounted on the rear frame. Is very easy to maintain and the wiring from the front welding head mounting frame to the rear frame for power and signal transmission is reduced. Since the front welding torch and the rear welding wire supply device are connected by the welding torch guide pipe, the wire can be easily guided, and the welding torch can be formed by using the welding torch guide pipe. Power can be supplied, eliminating the need for wiring with a thick welding cable as in the past. And, since the torch tilt angle adjusting device and the torch longitudinal movement adjusting device for rotating the welding torch guide pipe are provided on the rear frame, it is possible to automatically change the inclination of the plurality of torches and the longitudinal position. Since these devices are provided on the rear frame, maintenance and inspection are easy.

[Brief description of the drawings]

FIG. 1 is a perspective view of a spiral steel pipe inner surface welding apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory view of the same.

FIG. 3 is a partial perspective view of the same.

FIG. 4 is a partial perspective view of the same.

FIG. 5 is a partial perspective view of the same.

FIG. 6 is a partial perspective view of the same.

FIG. 7 is a partial perspective view of the same.

FIG. 8 is a partial perspective view of the same.

FIG. 9 is a partial perspective view of the same.

[Explanation of symbols]

10: Spiral steel pipe inner surface welding device, 11: Intermediate support frame, 12: Welding head mounting frame, 13: Rear frame, 14: Connecting rod, 15: Connecting rod, 1
6: first welding torch, 16a: nozzle, 17: second welding torch, 17a: nozzle, 18: third welding torch, 18a: nozzle, 19: welding unit, 20: torch inclination adjusting device, 21: Torch tilt adjusting device, 22: Torch tilt adjusting device, 23: Torch longitudinal movement adjusting device, 2
4: Torch longitudinal movement adjusting device, 25: spiral steel pipe, 2
6: Power cylinder for forming angle adjustment, 27: L-side pressing rod, 28: R-side pressing rod, 29: pressing balance rod, 30: servo valve stand for inner surface copying, 31: copying guide, 32: support frame, 33 : Cover, 34:
Guide rail, 34a: guide roller, 35: guide rail, 36: through hole, 37: hydraulic cylinder, 38: forward / backward rod, 39: flux supply device, 40: recovery hopper, 41: pipe, 42: pipe, 43: Guide pipe for welding torch, 44: Guide pipe for welding torch,
45: guide pipe for welding torch, 46: conductive joint, 4
7: conductive joint, 48: conductive joint, 49: welding wire feeder, 49a: variable speed motor, 50: welding wire feeder, 50a: variable speed motor, 51: welding wire feeder, 51a: variable speed motor, 52 : Clamping device, 5
3: upper wedge, 54: lower wedge, 55: hydraulic cylinder for clamping, 56: insulating cylinder, 57: common base plate,
58: Upper wedge for lifting, 59: Lower wedge for lifting, 6
0: male screw, 61: drive motor, 62: striker,
62a: lifting device, 63: arm for tilting, 64: slide piece, 65: pin, 66: electric worm jack, 6
7: mount, 68: mount, 69: mount, 70: moving base, 71: moving base, 72: nut for ball screw, 73: deceleration motor, 74: ball screw, 74
a: support member, 75: connector, 76: connector,
77: Connector, 78: Column, 79: Column, 8
0: cylindrical part, 81: rotary joint, 82: rotary joint, 83:
Rotating joint, 84: secondary cable, 85: secondary cable,
86: secondary cable, 87: relay terminal box, 88: welding power source, 89: inner surface welded part

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Rio Hiroshi Nakagawa 46-59, Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Machinery & Plant Business Department 20-1 Inside Nippon Steel Corporation Technology Development Division (72) Inventor Yoshihiro Sakagami 1 Kimitsu, Kimitsu City, Chiba Prefecture Inside Kimitsu Works, Nippon Steel Corporation (56) References JP-A-51-38251 (JP, A) JP-A-57-142777 (JP, A) JP-A-59-94587 (JP, A) JP-A-58-122200 (JP, A) JP-A-48-104814 (JP, U) 63-66571 (JP, U) Jikken 51-14033 (JP, Y2) JP 42-17418 (JP, B1) JP 37-2470 (JP, B1) (58) Int.Cl. ⁷ , DB name) B23K 9/032 B23K 9/133 B23K 9/32

Claims (1)

(57) [Claims] 1. An intermediate support frame, a welding head mounting frame provided with a plurality of sets of welding torches movably provided at a front portion of the intermediate support frame, and movably disposed at a rear portion of the intermediate support frame. A rear frame, a connecting rod connecting the rear frame and the welding head mounting frame, and moving the welding head mounting frame and the rear frame connected by the connecting rod in the front-rear direction with respect to the intermediate support frame. Advancing and retreating drive means for connecting and fixing the welding torch guide pipes extending to the rear frame to the respective welding torches, and supplying power to the welding torch via the respective welding torch guide pipes. And a welding wire supply device paired with the welding torch is provided on the rear frame. An inner surface welding apparatus for a spiral steel pipe for supplying a welding wire to the welding torch through a guide pipe for the torch, and the welding torch and the guide pipe for the welding torch connected to the same are provided with a clamping device for the welding torch. When opened, the torch can be rotated and moved back and forth, and the rear frame is provided with a torch inclination adjusting device for rotating the welding torch guide pipe. Further, the rear frame has a front-rear direction of the welding torch. An inner welding device for a spiral steel pipe, comprising a torch longitudinal movement adjusting device for adjusting a relative position of the torch.