JP2001321944A - Welding equipment for bent pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate necessity for dividing a bent pipe when welding the inside surface of the bent pipe. SOLUTION: On a table rack 4 supported tiltably by a supporting device 2 from a horizontal position to a vertical position, a two-axis tilting positioner 1 is formed by mounting a turn table 9 to be rotated and driven by a motor for rotation. On the turn table 9, a guide rail 15 is concentrically installed, and a welding truck 17 is mounted. The welding truck 17 is equipped with a carriage 9 traveling on the guide rail 15 by a motor 20 for traveling, a curved boom 24 whose base part is connected to the carriage 9 and a welding torch 26 oscillatably mounted at the tip of the curved boom 24. A controller controlling the motor for rotation and the motor 20 for traveling is provided. By controlling and driving the motor for rotation and the motor 20 for traveling, the rotation of the turn table 9 and the travel of the welding truck 17 are driven synchronously in the opposing directions, and after inserting the welding torch 26 while it keeps the same welding position into a bent pipe 34 on a bent pipe fixing and supporting rest 29 provided on the turn table 9, the welding is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bent pipe welding apparatus used for automatically welding a curved pipe to an inner surface thereof always in a downward position.

[0002]

2. Description of the Related Art For example, a curved pipe attached to a petroleum refining reactor has a stainless steel weld (stainless overlay) applied to the entire inner surface of a curved pipe made of carbon steel or low alloy steel. Welding of the inner surface of the curved pipe
After dividing the curved pipe into a plurality of segments in advance and performing welding by hand welding or a simple automatic welding machine for each segment,
The segments are connected to assemble a curved tube, and thereafter, the inner surface of the joint portion is welded.

[0003]

However, in the conventional method for welding the inner surface of a curved pipe described above, since the curved pipe is divided, the number of joints increases and the manufacturing cost increases. There is a problem that accuracy is deteriorated, and furthermore, since welding is performed by manual welding or semi-automatic welding, there is a problem that components of the overlay metal that is built up become unstable.

Accordingly, an object of the present invention is to provide a bent pipe welding apparatus which can automatically weld a bent pipe to an inner surface of the bent pipe without dividing the bent pipe.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a turntable rotatably mounted on a table base and rotatable by a rotating motor, and a turntable integrated with the table base. A support device for supporting the table in a tiltable manner from a horizontal position to a vertical position.
A guide rail is installed concentrically with the rotation center of the turntable, and a curved pipe fixing support that supports the curved pipe so as to have the same radius from the rotation center of the turntable is installed. Attached to the tip of the curved boom of the welding cart so that the welding torch can be swung in the radial direction of the turntable and can be fixed at an arbitrary swing angle position. And a controller for controlling the welding motor and the traveling motor of the welding bogie. By rotating the turntable rotation drive and the welding bogie traveling drive in the opposite directions, the welding torch is positioned in the downward position. The inner surface of the curved pipe is welded in the longitudinal direction as it is.

[0006] When the turntable is rotated while the welding torch is arranged downward, and the welding cart is moved along the guide rail in the direction opposite to the rotation direction of the turntable, the welding torch has the same posture. It can be inserted along the longitudinal direction into the curved pipe while keeping it in a downward position, so that welding can be performed on the inner surface of the curved pipe along the longitudinal direction.

Further, when the controller performs the rotation of the turntable and the traveling of the welding bogie in synchronization with each other, the rotation angle of the turntable is slightly smaller than the angle formed by the entire length of the curved pipe to be welded. When the angle becomes small,
By adopting a configuration in which the rotation motor and the traveling motor can be automatically stopped, overrun of the welding bogie can be prevented.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 to FIG. 3 show an embodiment of a bent pipe welding apparatus according to the present invention, in which a support device 2 having two support arms 3 extending in the front-rear direction at an upper end thereof is positioned at a required position. And a table base 4 disposed between the two support arms 3 of the support device 2 is supported on one end of the two support arms 3 so as to be tiltable (rotatable) in the vertical direction together with the shaft 5,
A forward / reverse tilting motor 6 having a brake (not shown) is installed between the other ends of the support arms 3, and a pinion 7 attached to an output shaft of the tilting motor 6 and the table base And a substantially semicircular gear 8 fixed to a shaft 5 disposed on one side surface of the turntable 9, and a rotating shaft 10 protruding from the lower surface of the center of the turntable 9 on the table base 4. And a ring gear 12 provided on the outer peripheral portion of the rotating shaft 10.
A pinion 14 attached to an output shaft of a rotation motor 13 such as a servomotor installed at a required position of the table base 4
And the turntable 9 is rotated through the pinion 14, the ring gear 12, and the shaft 10 by driving the rotation motor 13, and the gear is driven through the pinion 7 by driving the tilt motor 6. By rotating the table 8, the turntable 9 is integrated with the table base 4.
Is tilted from a horizontal position to a vertical position, and can be held at an arbitrary tilt angle.

A guide rail 15 is provided on the turntable 9 of the biaxial tilting positioner 1 so as to be concentric with the center of rotation of the turntable 9, and a required distance from the upper surface of the turntable 9 via support legs 16. The welding carriage 17 is mounted on the guide rail 15 so as to be able to run in the circumferential direction.

The welding cart 17 will be described in detail. Wheels 1 are arranged on the inner peripheral sides of four corners of a rectangular plate-shaped carriage 18 arranged on the outer peripheral side of the guide rail 15 so as to face vertically.
9 so that the guide rail 15 is sandwiched between the wheels 19 from above and below, so that the carriage 18
Is mounted on a guide rail 15, and the carriage 18 can move along the guide rail 15 by rolling each wheel 19. Also, the carriage 1
8, a running motor 2 such as a servomotor
The output shaft of the traveling motor 20 penetrates through the carriage 18 and protrudes inward, and a pinion 21 is attached to the protruding end, and the pinion 21 is connected to the outer periphery of the guide rail 15. Rack 2 provided over the entire circumference on the side
2 and the pinion 21 is rotated on the rack 22 by the driving of the traveling motor 20, so that the carriage 18 can travel along the guide rail 15.

Further, a lower end of an arm member 23 extending in the vertical direction is connected to the carriage 18, and an upper end of the arm member 23 has the same radius of curvature as the tube axis of the curved tube 34 to be welded. A base end of a curved boom 24 disposed to extend at a required angle in the circumferential direction is attached via a position adjustment stage 25 capable of adjusting a position in a longitudinal direction of the arm member 23, and a distal end of the curved boom 24 is attached. In addition, the welding torch 26 is connected so as to be able to swing in the radial direction of the turntable 9, and a clamp for fixing the position (not shown) is provided in the connecting portion, and the clamp is connected to the lever 27 for fixing the swinging position. By operating through the welding torch 26
Can be fixed at any swing angle position.
Reference numeral 28 denotes a torch vertical adjustment electric mount provided on the base end side of the welding torch 26.

On the upper surface of the turntable 9 of the biaxial tilting positioner 1, a fan-shaped table 30 extending about 90 degrees in the circumferential direction is straddled on the guide rail 15 so as to form an arc having the same radius as the center of rotation of the turntable 9. And a bent pipe fixing jig 32 for fixing both ends of the bent pipe 34 on a table 30 of the bent pipe fixing support 29 by bolts 31 so as to be detachable. With
The bent pipe 3 is fixed to each bent pipe fixing jig 32 of the bent pipe fixing support 29.
By fixing both end portions of the turntable 4, the curved tube 34 can be arranged and fixed concentrically with the center of the turntable 9.

Further, a controller 33 for controlling the rotation motor 13 of the turntable 9 and the traveling motor 20 of the welding carriage 17 is provided, and the controller 33 controls the rotation motor 13 and the traveling motor. By controlling the rotation of the turntable 9 and the traveling of the welding carriage 17 in the opposite direction (opposite direction) by controlling the welding torch 26, the curved torch fixing support base can be displaced without displacing the welding torch 26. 29 to be welded by being inserted into the curved tube 34.

When welding the inner surface on the outer diameter side of the curved pipe 34, first, the curved pipe 34, which is bent by 90 degrees, for example, is placed on the table 30 of the curved pipe fixing support 29 by using the curved pipe fixing jig 32. 4, the turntable 9 of the two-axis tilting positioner 1 is arranged vertically by driving the tilting motor 6, and then the turntable 9 is rotated by the rotary motor 13, as shown in FIG. Then, one end of the bent pipe 34 fixed to the bent pipe fixing support base 29, that is, one end on the side of the welding carriage 17 is positioned at the lowermost position, and then the welding carriage 17 is moved by the traveling motor 20 to the guide rail. 15 along the welding torch 2 at the tip of the curved boom 24.
6 is arranged at the welding start position inside one end of the curved pipe 34, and furthermore, the swinging position fixing lever 27 is operated to set the welding torch 26 so that the welding line is directed downward.
Is fixed downward.

In this state, the welding of the inner surface of the curved tube 34 by the welding torch 26 is started, and the turntable 9 is rotated by the controller 33 in synchronization with the welding carriage 1.
Run 7 By rotating the turntable 9, the curved tube 34 is moved at a required speed toward the welding bogie 17 (clockwise in the drawing), and at the same time, the welding bogie 17 is moved in a direction opposite to the rotation direction of the turntable 9 (counterclockwise in the drawing). 4), the traveling of the welding cart 17 along the guide rails 15 is offset by the rotation of the turntable 9, whereby the welding cart 17 maintains the posture of FIG. 4 as shown by the two-dot chain line in FIG. The welding torch 26 is inserted along the longitudinal direction into the curved tube 34 without displacing and keeping the posture always downward, and as shown in FIG. A weld bead 3 of overlay metal along the longitudinal direction
5 are formed (in the figure, O indicates the rotation center of the turntable 9). At this time, the controller 33 previously instructs the controller 33 that the rotation angle of the turntable 9 by the rotation motor 13 is slightly smaller than the angle formed by the entire length of the curved tube 34, for example, 9 degrees.
By giving a command to stop the rotation motor 13 and the traveling motor 20 when the rotation angle of the turntable 9 becomes 85 degrees with respect to the curved tube 34 of 0 degrees, the welding torch is provided. 26 can prevent overrun of welding.

When welding from one end to the other end in the curved tube 34 is performed as described above, the rotation motor 13
And the traveling motor 20 are reversed, respectively, so that the curved pipe 3
After the relative position between the welding table 4 and the welding carriage 17 is set to the initial state as shown by the solid line in FIG. 4, the tilt motor 6 of the two-axis tilt positioner 1 is driven to turn the turntable 9 as shown in FIG. Since the angle of the welding torch 26 is changed by tilting the turntable 9 by a required angle, the swinging position fixing lever 27 is operated to move the welding torch 26 downward again, and thereafter, in the same manner as described above. , Controller 33
To control the rotation motor 13 and the traveling motor 20 to control the rotation speed of the turntable 9 and the traveling speed of the welding carriage 17 so that the welding speed is constant, and perform the operations in synchronization with each other in opposite directions. As a result, the welding torch 26 is inserted in the longitudinal direction of the bent tube 34 without displacing, and the inner surface of the bent tube 34 is constantly welded downward, and as shown in FIG. And a weld bead 35 to be welded is formed.

Next, in the same manner as described above, the turntable 9 of the two-axis tilting positioner 1 is sequentially tilted by a required angle to a horizontal position.
By forming a weld bead 35 by performing welding along the longitudinal direction, as shown in FIG. 5C, the circumferential direction from the outer diameter side of the curved tube 34 to the radially intermediate portion on the turntable 9 side is formed. Welding is performed on the inner surface of the quarter.

Thereafter, as shown in FIG.
Then, the turntable 9 and the welding carriage 17 are integrally turned over by 180 degrees by driving only the turntable 3, and then the turntable 9 is tilted by the tilting motor 6 so that the turntable 9 rises to a required angle. After the swinging position fixing lever 27 is operated to position the welding torch 26 downward, the controller 33 controls the rotation motor 13 and the traveling motor 20 as described above, and the clock of the turntable 9 is turned on. In this case, the welding torch 26 is always inserted downward in the longitudinal direction of the curved pipe 34 without displacing the welding torch 26 by displacing the rotation in the direction and the traveling of the welding carriage 17 in the counterclockwise direction by synchronizing the rotation in FIG. As shown in (d), a welding bead 35 for welding to the existing welding bead 35 is formed, and then the turntable 9 is similarly tilted so that the turntable 9 is sequentially raised to a vertical position by a required angle. Reluctant, each tilted position, the bends 34
As shown in FIG. 5E, the welding bead 35 is formed by performing welding along the longitudinal direction on the inner surface of
Welding is performed on the inner surface of the semicircular portion from the outer diameter side to the inner diameter side of the curved tube 34 on the turntable 9 side.

Next, the bent pipe 34 fixed to the bent pipe fixing support 29 is removed from the bent pipe fixing jig 32 by removing the bolt 31.
Once removed, the removed curved tube 34 is turned upside down and attached to the curved tube fixing support 29 again. Thereafter, the inner surface of the semicircular portion on the turntable 9 side of the curved tube 34 is subjected to the same procedure as described above. Then, welding beads 35 extending in the longitudinal direction are sequentially formed by shifting the required angle by a predetermined angle, and welding is performed, thereby forming welding beads 35 on the entire inner surface of the curved pipe 34 as shown in FIG. Will be performed.

In the above description, since the distance from the center of rotation of the turntable 9 is different between the inner diameter side and the outer diameter side of the curved tube 35, the curved tube 34 is rotated by the rotation of the turntable 9.
Since the peripheral speed at the time of moving is different, the moving speed in the circumferential direction at the welded portion is constant even at the time of inner surface welding at the inner diameter side and at the time of inner surface welding at the outer diameter side, and welding can be performed at a constant speed. As described above, the controller 33 controls both the rotation motor 13 and the traveling motor 20. In this case, the controller 33 controls the distance from the rotation center of the turntable 9 to the position where welding is performed by the welding torch 26 and the welding speed to the controller 33 as data and causes the controller 33 to perform calculations. Good.

As described above, welding can be performed by forming the weld bead 35 along the longitudinal direction on the inner surface of the curved tube 34, so that it is not necessary to divide the curved tube 34 as in the related art, and Since the welding position can be always downward, the welding quality can be stabilized, and the welding in the longitudinal direction of the curved pipe 34 can be automated. To reduce the amount of welding work that can be performed at a constant welding speed, the composition of the overlay metal can be kept constant, and the amount of welding work that requires the intervention of a welder can be reduced. Can be.

The present invention is not limited to the above embodiment. In the above, the welding operation is started from the outer diameter end of the curved tube 34 with the turntable 9 arranged at a vertical position. However, the welding operation may be started from the inner diameter side of the curved pipe 34, or the welding operation may be started from a state in which the turntable 9 is arranged in a horizontal position. Of course, various changes can be made without departing from the gist.

[0024]

As described above, according to the curved pipe welding apparatus of the present invention, a turntable that is rotatably mounted on a table base and rotatable by a rotation motor is provided.
A guide rail is installed concentrically with the center of rotation of the turntable on the upper surface of the turntable of a two-axis tilting positioner including a support device that supports the turntable in a tiltable manner from a horizontal position to a vertical position integrally with the table base. And a curved pipe fixing support for supporting the curved pipe so as to have the same radius from the rotation center of the turntable is installed, the welding bogie is mounted on the guide rail so as to be able to run, and the distal end of the curved boom of the welding bogie. In addition, the welding torch is mounted so that it can be swung in the radial direction of the turntable and can be fixed at an arbitrary swinging angle position, and further, it controls the rotation motor of the turntable and the traveling motor of the welding cart. It is equipped with a controller, and by performing the rotation drive of the turntable and the traveling drive of the welding cart in synchronization with each other in the opposite direction, welding The inner surface of the bent pipe can be welded in the longitudinal direction while maintaining the welding torch downward, so that the turntable is rotated in the direction of the welding bogie while the welding torch is positioned downward. By running in the direction opposite to the rotation direction of the turntable, the welding torch can be inserted in the longitudinal direction into the curved pipe and welded in the downward direction while maintaining the same posture, so that welding of the inner surface of the curved pipe can be performed. In this case, it is possible to eliminate the necessity of dividing the curved pipe as in the conventional case, and since the welding position is always downward, it is possible to stabilize welding quality. By adjusting the rotation speed of the turntable and the traveling speed of the welding bogie with the controller between the inner surface welding on the outer diameter side and the welding speed, the welding speed is continuously constant inside the narrow curved pipe. It can be welded, the composition of the overlay metal can be kept constant, and the amount of welding work that requires the intervention of a welder can be reduced, so that the cost can be reduced. And the controller
When the rotation angle of the turntable when synchronizing the rotation of the turntable and the traveling of the welding cart in the opposite direction is slightly smaller than the angle formed by the entire length of the curved pipe to be welded, the rotation is performed. With the configuration in which the motor for driving and the motor for traveling can be automatically stopped, an effect that overrun of the welding bogie can be prevented can be exhibited.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an embodiment of a curved pipe welding apparatus according to the present invention.

FIG. 2 is a partially cutaway schematic front view of the apparatus shown in FIG.

FIG. 3 is a partially cut-away schematic side view of the apparatus shown in FIG. 1;

FIG. 4 is a schematic front view showing a state when welding the inner surface on the outer diameter side of the curved pipe by the apparatus shown in FIG. 1;

FIG. 5 shows each step of welding by the apparatus shown in FIG. 1, wherein (a), (b), (c), (d), (e), and (f) show cross sections of a bent pipe at different steps. FIG.

FIG. 6 is a schematic side view showing a state in one step of welding by the apparatus shown in FIG. 1;

FIG. 7 is a schematic front view showing a state during another step of welding by the apparatus shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 2-axis tilting positioner 2 Support device 4 Table mount 9 Turntable 13 Rotation motor 17 Welding trolley 18 Carriage 20 Running motor 24 Curved boom 26 Welding torch 29 Curved pipe fixed support 33 Controller 34 Curved pipe

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B23K 37/047 501 B23K 37/047 501D // B23K 101: 06 101: 06

Claims (2)

[Claims] 1. A turntable rotatably mounted on a table base and rotatably driven by a rotation motor, and a supporting device for supporting the turntable integrally with the table base so as to be tiltable from a horizontal position to a vertical position. On the upper surface of the turntable of the two-axis tilting positioner
A guide rail is installed concentrically with the rotation center of the turntable, and a curved pipe fixing support that supports the curved pipe so as to have the same radius from the rotation center of the turntable is installed. Attached to the tip of the curved boom of the welding cart so that the welding torch can be swung in the radial direction of the turntable and can be fixed at an arbitrary swing angle position. And a controller for controlling the welding motor and the traveling motor of the welding bogie. By rotating the turntable rotation drive and the welding bogie traveling drive in the opposite directions, the welding torch is positioned in the downward position. A curved pipe welding apparatus having a configuration in which the inner surface of a curved pipe can be welded in the longitudinal direction as it is. 2. The rotation angle of the turntable when the controller performs the rotation of the turntable and the traveling of the welding bogie in a direction opposite to each other is slightly smaller than the angle formed by the entire length of the curved pipe to be welded. The curved pipe welding apparatus according to claim 1, wherein the rotation motor and the traveling motor can be automatically stopped when the angle becomes small.