JPS6358674B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a method for changing the size of a steel pipe during the manufacture of spiral steel pipes, by determining the spiral angle, the position in the pipe axis direction, and the longitudinal direction of the weld seam of a welding nozzle row consisting of a plurality of welding nozzles. The present invention relates to an internal welding device for spiral steel pipe manufacturing equipment that allows for easy adjustment of the position and adjustment while welding.

[Conventional technology]

When changing the steel pipe size in spiral steel pipe manufacturing equipment, it is necessary to adjust the spiral angle, the position in the pipe axis direction, and the longitudinal position of the weld seam of a welding nozzle row consisting of a plurality of welding nozzles.

Spiral angle adjustment refers to adjusting the welding nozzle row to the third
The forming angle θ shown in the figure is changed, and the tube axis direction position adjustment means moving the welding nozzle row in the tube axis direction to adjust the position.Furthermore, the weld seam longitudinal position adjustment means: The position is adjusted by moving the welding nozzle row in the front-back direction of point 19 on the welding seam line in FIG. 3.

In general, the following methods are available for internal welding in spiral steel pipe manufacturing equipment.

(1) Location 17 where one side edge of the strip first meets the other side edge (see Figures 3 and 4)
A method of submerged arc welding.

(2) After tack welding at the above position, submerged arc welding is performed at position 19 in Figure 3 after one revolution of the spiral steel tube.

(3) A method in which tack welding is performed at position 17 where one edge of the strip first meets the other edge of the strip in Figure 3, and then submerged arc welding is performed on a separate line.

Next, an internal welding device in conventional spiral steel pipe manufacturing equipment will be explained with reference to FIGS. 1 and 2. A large number of internal forming rolls 3 are attached to the lower part of a support beam 4 that extends in the tube axis direction, that is, in the front-rear direction. The strip 1 is formed into a spiral shape by the inner surface forming roll 3 and two rows of outer surface forming rolls (not shown), and one side edge and the other side edge of the strip are formed by a plurality of welding nozzles 7A to 7C.
The spiral steel pipe 2 is manufactured by welding and joining.

A plurality of welding energizing and welding core guide pipes 5A to 5C are inserted into the support beam 4, and welding heads 6A to 6C each having a welding nozzle 7A to 7C attached thereto are fixed to the front end of each pipe 5A to 5C. and a pipe support member 1 into which the front end portion of each of the pipes 5A to 5C is rotatably and slidably inserted.
2 is provided on the front part of the support beam 4 so as to be movable in the left and right directions perpendicular to the longitudinal direction of the support beam 4, and the pipe support member 12 has one end portion of a left and right position adjustment screw 15 extending in the left and right direction. is rotatably mounted, and its horizontal position adjustment screw 15 is screwed into a nut 60 fixed to the support beam 4.

The front end portions of each of the pipes 5A to 5C are connected to welding core wire supply devices 13A to 13C, respectively, and core wire supply device mounting members 14A to 14C to which each of the welding core wire supply devices 13A to 13C are fixed are respectively fixed to a support stand 10. Front and rear position adjustment device 8A~
A sliding guide bar 11 connected to 8C and extending in the front-rear direction is slidably inserted into a guide member 61 fixed to the support base 10 and fixed to the support beam 4, and is connected to the guide bar 11. It is connected to the support beam 4 via a moving cylinder 9.

The cylinder 9 is expanded and contracted by a command from a control device (not shown), and the cylinder 9 extends and contracts the support base 10, the longitudinal position adjustment devices 8A to 8C, and the core wire supply device mounting members 14A to 1 via the guide bar 11.
4C, welding core wire supply devices 13A to 13C, pipes 5A to 5C, welding heads 6A to 6C, and welding nozzles 7A to 7C are moved in the front-back direction.

When changing the size of steel pipe, welding nozzle 7A~
When changing the spiral angle and the position in the tube axis direction of the welding nozzle rows 7C, each of the longitudinal position adjustment devices 8A to 8C is operated separately, and each welding nozzle 7A to 7C is individually adjusted in the tube axis direction, i.e. It is moving forward and backward. In addition, when adjusting the position of the welding nozzle row in the longitudinal direction of the spiral welding seam, use the left and right position adjustment screw 15.
By simply rotating the pipe support member 12, the pipe support member 12 moves in the left and right directions perpendicular to the longitudinal direction of the support beam, that is, in the left and right directions perpendicular to the pipe axis, and does not move in the longitudinal direction of the spiral weld seam. Pipe support member 1 by rotation of screw rod 15
2 left and right movement and each front and back position adjustment device 8A~
Each welding nozzle 7A-7C with separate operation of 8C
The position of the welding nozzle row in the longitudinal direction of the welding seam is adjusted by moving the welding nozzle row in the longitudinal direction of the welding seam. Furthermore, the first welding nozzle 7 is connected from the point where the left end surface of the strip 1 intersects with a vertical line passing through the center of the tube.
When changing the length up to A (off-center l), rotate the left-right position adjustment screw 15 to move the pipe support member 12 in the left-right direction, and also move the pipe support member 12 in the left-right direction, The position is adjusted by operating each pipe rotation angle changing device separately.

[Problem to be solved by the invention]

However, in the case of the internal welding device in the conventional spiral steel pipe manufacturing equipment, when changing the size of the steel pipe, when changing the spiral angle of the welding nozzle row, or when changing the position of the welding nozzle row in the tube axis direction, Each welding nozzle 7A~
It is necessary to separately operate each of the longitudinal position adjustment devices 8A to 8C attached to the welding nozzle 7C to move each welding nozzle 7A to 7C in the tube axis direction, and also to adjust the longitudinal position of the welding seam of the welding nozzle row. When making adjustments, it is necessary to perform a combination of horizontal movement of the pipe support member 12 and movement of each welding nozzle 7A to 7C in the pipe axis direction by separate operation of each longitudinal position adjustment device 8A to 8C. There are problems in that the number of adjustments required when changing the size is large, the adjustment operation is complicated, and the adjustment time is long.

[Purpose and structure of the invention]

The purpose of this invention is to provide an internal welding device for spiral steel pipe manufacturing equipment that advantageously solves the above-mentioned problems. A holding member 31 that is moved in the tube axis direction is supported by a telescoping beam that is expanded and contracted by a telescopic drive device, and the holding member 31 is rotated around the center line of the vertical axis 29 by a spiral angle changing drive device 26. A rotating base 30 for changing the spiral angle of the welding nozzle array is provided, and a welding nozzle support fitting 36 is attached to the rotating base 30, which is moved in the left-right direction of the pipe cross section by a lateral movement drive device, and the welding nozzle This internal welding device for spiral steel pipe manufacturing equipment is characterized in that a support fitting 36 is provided with a welding nozzle row consisting of a plurality of welding nozzles held by a welding nozzle holder.

〔Example〕

Next, the present invention will be explained in detail based on the embodiments shown in FIGS. 3 to 9.

Reference numeral 16 in FIG. 4 is an external view of an internal welding device used in the present invention, which is attached to the tip of the support beam 4. Also, as shown in FIG.
Tack welding is performed at 7, and then outer and inner welding are performed at positions 18 and 19 after half a turn and one turn, respectively.

A vertical shaft 29 is fixed to a rotating base 30 for changing the welding nozzle row spiral angle, and the vertical shaft 29 is rotatably fitted into a holding member 31 and a gear 28 fixed thereto by a bolt 28'. A spiral angle changing drive device 26 consisting of an electric motor is fixed to the rotation base 30, and a pinion 27 driven by the drive device 26 is meshed with the gear 28. When the pinion 27 is driven by the drive device 26, the pinion 27 is driven by the drive device 26. is gear 2
Turn on the pitch circle of 8, and the pinion 2
7 rotates the drive device 26, the vertical shaft 29, and the rotation base 30.

Reference numerals 32 to 35 in FIG. 9 are devices for pressing and fixing the rotating base 30 to the holding member 31,
A plurality of camshafts 3 attached to the holding member 31
Eccentric cams 33 are rotatably fitted in 2, each eccentric cam 33 is in contact with the pressed flange 30' of the rotating base 30, and the operating rod 34 to which the arm of each eccentric cam 33 is pivotally mounted is rotatable. connected to the piston rod 35' of the fluid pressure cylinder 35 for fixing the base;
In order to press and fix the rotating base 30 to the holding member 31, the piston rod 35' of the fluid pressure cylinder 35 and the operating rod 34 connected thereto are moved forward, and the operating rod 34 moves the eccentric cam 33 in the pressing direction. Rotate it.

Note that as a device for pressing and fixing the welding nozzle row spiral angle changing rotary base 30 to the holding member 31, a device having an arbitrary structure other than the above, such as a wedge-type pressing device, may be used.

Reference numerals 36 to 39 in FIG. 7 are welding seam longitudinal direction moving devices, in which a plurality of sliding guide bars 37 extending in a direction perpendicular to the tube axis are fitted into the welding nozzle support fitting 36 and installed on the rotation base 30. A fixed screw 38 disposed parallel to the guide bar 37 is screwed into the welding nozzle support fitting 36 and rotatably supported by the rotation base 30, and the screw 38 is connected to the electric motor 39.
The electric motor 39 drives the screw 3.
8, the welding nozzle support fitting 36 is guided by the guide bar 37 and moved in the longitudinal direction of the welding seam, thereby adjusting the off-center amount.

In FIG. 5 and FIG. 7, 21, 21A~
21C to 25 are welding heads, 21A to 21C are welding head core wire guides, 22 and 23 are lower and upper rotation shafts of the welding head core wire guide 21, and 24 and 25 are welding head core wire guides 21.
This is a tube axial expansion joint.

S in FIG. 6 is a seam detector (for example, a rotating core type eddy current sensor), and this seam detector S
In this embodiment, there is one, but a plurality of them may be attached.

40A to 40C in Fig. 7 are welding nozzles, 41A
-41C are welding nozzle holders, each welding nozzle holder is integrated with sector gears 43A to 43C, and pinions 42A to 42C meshing with sector gears 43A to 43C are connected to separate electric motors 44 (Fig. 5). and FIG. 6), and each electric motor 44 connects pinions 42A to
42C, sector gears 43A to 43C, and welding nozzle 40A via welding nozzle holders 41A to 41C.
Adjust the welding nozzle spacing by rotating ~40C. At this time, the sector gear rotates using the black circle mark 43' on the welding nozzle center line shown in FIG. 7 as a fulcrum.

Reference numerals 46 to 54 in FIGS. 4, 5, and 8 indicate tube axial welding head position changing mechanisms;
7 and 48 are telescopic beams each consisting of an inner cylinder, an intermediate cylinder, and an outer cylinder, and the inner cylinder 46 is rotatably connected to the tip of the support beam 4 by a vertical connecting pin 49. The location of this connection pin 49 is strip 1.
passing position 17 of the left side edge of or its position 1
It is desirable to position it as close to 7 as possible.

Reference numeral 50 denotes rolling bearings consisting of spherical bearings attached to the lower portions of both sides in the longitudinal direction of the outer cylinder 48, and are placed on the inner surface of the spiral steel pipe. In order to adjust the amount of gap (or amount of wrap) between the left side edge and right side edge of the strip during pipe making, a steel pipe turning roller (not shown) is provided as shown in Fig. 3. When the spiral steel pipe 2 is swung by the cylinder 57 rotating the steel pipe turning and unloading rotating frame 56, the inner welding device 16 is placed on the inner surface of the spiral steel pipe 2 via the rolling bearing 50. Since it is connected, connect pin 49
It rotates to follow the spiral steel pipe 2 using the fulcrum as the fulcrum.
Reference numeral 51 denotes a rod for expanding and contracting the telescopic beam. The left end (front end) of the rod 51 is connected to the outer cylinder 48 of the telescopic beam by a connecting pin 54, and the right end (rear end) of the rod 51 has a male screw 51'. is screwed into the center of a worm gear 53, and a worm 52 driven by a telescopic drive device (not shown) consisting of an electric motor is engaged with the worm gear 53.

Reference numeral 58 is a welding core wire supply device fixed to the outer cylinder 48, and 59 is an inner welding head tracking control device consisting of a hydraulic cylinder for making the inner welding head follow the welding seam position. The cylinder in the control device is attached to the front part of the outer cylinder 48, and the front end of the piston rod is fixed to the holding member 31. Further, sliding guide plates 31'' fixed to both left and right sides of the lower portion of the holding member 31 slide within groove-shaped rails 48' fixed to both left and right sides of the outer cylinder 48.

In addition, in FIG. 3, 55 is a forming frame, and in FIG. 5, 45 is a welding core wire guide roll.

Next, the operation of the equipment of the above embodiment will be explained.

(a) Adjustment of the position of the welding nozzle row in the tube axis direction.

In order to respond to changes in the spiral pitch L due to steel pipe size changes, the telescopic drive device rotates the worm 52 to move the rod 51 in the tube axis direction, that is, in the front-rear direction, and by moving the rod 51, the telescopic beam is expanded and contracted, and the holding member 31 is moved in the tube axis direction to move the position of the vertical axis 29 onto the spiral weld seam at the bottom of the steel tube.

(b) Adjustment of the spiral angle of the welding nozzle row.

Next, after shortening the rotating base fixing cylinder 35 to release the fixed part, the spiral angle changing drive device 26 is operated to rotate the rotating base 30 to a predetermined position via the pinion 27 and gear 28, and then The fixing cylinder 35 is extended to press and fix the lower part of the rotating base 30 so that it does not move relative to the holding member 31.

(c) Adjustment of the welding seam longitudinal position of the welding nozzle row.

Next, the off-center setting electric motor 39 is operated to move the welding nozzle support fitting 36 in the longitudinal direction of the seam by the screw 38, and the pinions 42A to 42C are moved by the nozzle interval setting electric motor 44.
Welding nozzle holders 41A to 41C and welding nozzles 40A to 4 via sector gears 43A to 43C
Rotate 0C appropriately and connect each welding nozzle 40A to 40C.
Set the distance between the tips of the two to an appropriate value.

In addition, if the seam position changes in the pipe axis direction for some reason during the steel pipe, use the seam position detector S.
etc. to give a command to the cylinder 59 and control the position of the welding nozzle row to follow the position of the welding seam.

In order to adjust the welding gap (or wrap) for tack welding, the cylinder 57 for adjusting the welding gap is usually extended or shortened during pipe manufacturing to rotate the rotating frame 56 for rotating and transferring the steel pipe. However, in response to the swinging of the spiral steel pipe caused by this, the telescopic beam automatically follows and moves while being supported by the rolling bearing 50.

In this way, each setting point can be adjusted in a single operation, which greatly reduces the time required for setting, and by adding a pulse generator or rotary shaft encoder to the motor shaft, even higher precision can be achieved. Can be configured.

In the case of the above embodiment, the distance between the welding nozzles can be easily adjusted by rotating the nozzle holder using the drive device for adjusting the nozzle distance, and the seam detection device attached to the welding nozzle support fitting 36 can be used to easily adjust the distance between the welding nozzles. The welding head tracking control device 59 is actuated by the detection signal from the welding device S, so that the welding nozzle can reliably follow the seam.

Although the embodiment described above is an example in which the present invention is applied to the inner welding method described in 2 above, the present invention can also be implemented to the inner welding methods described in 1 and 3 above.

Furthermore, when carrying out this invention, the rolling bearing 50
Alternatively, roller bearings may be used instead of spherical bearings. Furthermore, means for expanding and contracting the telescopic beam, means for rotating the rotation base 30 for changing the welding nozzle row spiral angle with respect to the holding member 31, means for moving the welding nozzle support fitting 36 in the left-right direction, and welding. As a means for rotating the nozzle holder, any structure other than that shown in the drawings may be employed.

〔Effect of the invention〕

According to the present invention, the welding nozzle row spiral angle changing rotating base 30, which supports a plurality of welding nozzles, is rotated around the center line of the vertical axis 29 by the spiral angle changing driving device 26. You can easily and quickly adjust the spiral angle of the welding nozzle row by simply
Furthermore, simply by expanding and contracting the telescoping beam using the telescoping drive device and moving the holding member 31 in the tube axis direction, a plurality of welding nozzles constituting the welding nozzle row can be moved simultaneously in the tube axis direction. The position in the tube axis direction can be adjusted easily and quickly, and after the rotation base 30 is rotated to adjust the spiral angle of the welding nozzle row, the welding nozzle support fitting 36 is simply moved by the lateral movement drive device. By doing this, the longitudinal position of the welding seam of the welding nozzle row can be easily and quickly adjusted, and therefore the position of the welding nozzle row in three directions can be easily and quickly adjusted when changing the steel pipe size. You can get the effect you want.

[Brief explanation of drawings]

FIG. 1 is a side view of an internal welding machine used in conventional spiral steel pipe manufacturing equipment, and FIG. 2 is a front view thereof. 3 to 9 show an embodiment of the present invention, in which FIG. 3 is a plan view of a spiral steel pipe showing each welding position, and FIG. 4 shows a welding device connected to a support beam. Overall side view showing,
Fig. 5 is a longitudinal side view showing the internal welding device, Fig. 6 is a detailed view of the seam detector mounting part, Fig. 7 is a front view of the internal welding device, and Fig. 8 is a cross section taken along line A-A in Fig. 5. FIG. 9 is a front view showing the lower pressing mechanism of the rotation base for changing the spiral angle of the welding nozzle row. In the figure, 1 is a strip, 2 is a spiral steel pipe, 3 is an inner forming roll, 4 is a support beam, 1
6 is the inner welding device, 17 is the tack welding position, 18 is the outer welding position, 19 is the inner welding position, 20 is the rotation fulcrum of the forming angle adjustment device, 21A to 21C are the welding head core wire guide, 22 is the lower part of the welding head core wire guide A rotating shaft, 23 is a welding head core wire guide upper rotating shaft, 24 and 25 are expansion joints, 26 is a drive device for changing the spiral angle, 29 is a vertical axis, 30 is a rotating base for changing the welding nozzle spiral angle, 31 is a holding member, 33 is an eccentric cam, 35 is a rotating base fixing cylinder, 36 is a welding nozzle support fitting, 3
9 is a horizontal movement electric motor, 40A to 40C are welding nozzles, 41A to 41C are welding nozzle holders, 44
is the electric motor for nozzle spacing adjustment, 49 is the connection pin, 5
0 is a rolling bearing, 51 is a beam expansion and contraction rod, 52
is a worm, 53 is a worm gear, 57 is a gap adjustment cylinder, 58 is a core wire supply device, 59
is a welding head tracking control device, and S is a detector.

Claims (1)

[Scope of Claims] 1. A holding member 31 that is moved in the tube axis direction within a spirally formed steel pipe is supported by a telescoping beam that is extended and contracted by a telescoping drive device. A rotating base 30 for changing the welding nozzle row spiral angle is provided, which is rotated around the center line of the vertical axis 29 by the changing drive device 26, and the rotation base 30 is provided with a rotating base 30 for changing the welding nozzle row spiral angle in the horizontal direction of the pipe cross section by the lateral movement driving device. Spiral steel pipe manufacturing characterized in that a welding nozzle support fitting 36 that is moved is attached to the welding nozzle support fitting 36, and a welding nozzle row consisting of a plurality of welding nozzles held by a welding nozzle holder is provided on the welding nozzle support fitting 36. Internal welding equipment in equipment. 2. An internal welding device for a spiral steel pipe manufacturing facility according to claim 1, wherein the extensible beam in the internal welding device is rotatably connected to the support beam 4 by a connecting pin 49 perpendicular to the supporting beam 4. 3. An internal welding device for spiral steel pipe manufacturing equipment according to claim 1 or 2, characterized in that a plurality of welding nozzles are independently rotatably attached to the welding nozzle support fitting 36. .