JP2594601B2 - Steel pipe welding equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a steel pipe welding apparatus for welding a plurality of steel pipes to each other on a joint inner peripheral surface.

(Background technology)

When installing steel pipe piles and steel pipe concrete columns in the ground, weld the lower end of the next steel pipe pile to the above ground protruding part of the steel pipe pile buried in the ground, push it into the ground, and sequentially insert the next steel pipe pile. Welding has been performed.

However, in welding this steel pipe pile, since the upper end and lower end of the steel pipe pile are manually welded from the outer periphery, if the work circulation is not good, especially when the wind is strong, the welding work cannot be performed reliably and the quality is affected. Or the welding protrusions become resistance when the steel pipe is buried. Further, this steel pipe welding cannot be performed without sufficient work space between adjacent premises when welding while burying a steel pipe.

[Problems to be solved by the invention]

All of these problems at the time of welding steel pipes are caused by workers manually welding steel pipes from the outside, and the present invention provides a steel pipe welding method capable of automatically welding steel pipes from each other from the inside. The purpose is to get the device.

[Means for solving the problem]

The present invention is a steel pipe welding device for welding a plurality of steel pipes to each other on a joint inner peripheral surface, a guide rail inserted along an axis of the steel pipe, and a bogie moved along the guide rail, A welding torch mounted on the bogie and swiveling along the inner circumference of the steel pipe; and a welding torch swiveling with respect to the bogie along the joining surface of the steel pipe and moving in the axial direction of the steel pipe to form a welding inner torch. And control means for following the surface.

For this reason, in the present invention, if the bogie is moved while being guided by guide rails arranged along the axis of the steel pipe, and welding is performed along the inner circumference of the steel pipe while turning the welding torch around the bogie, The ends of the steel pipes are welded together. During this welding, the welding torch is swiveled along the inner peripheral surface of the steel pipe by the control means and can be moved in the axial direction of the steel pipe. Therefore, even when the joint end face of the steel pipe is not uniform and is displaced in the axial direction, it is accurate. The welding work can be performed in a short time.

In the present invention, the guide rail is inserted along the axis of the steel pipe, and the bogie moves along the guide rail. Therefore, even when welding the vertical pipe, the guide rail is inserted into the vertical pipe and suspended, and the bogie is moved along the guide rail to the joint surface (weld portion) of the steel pipe to weld the steel pipe. can do.

Further, even in a place where the steel pipe is inclined, the guide rail can be similarly inserted along the axis of the steel pipe, and the bogie can be moved to the back of the steel pipe along the guide rail to weld the steel pipe. .

The present invention is also applicable to the case where the embedding work is performed after welding the projecting part to the ground and the lower end of the next steel pipe while embedding the steel pipe, or when embedding a plurality of steel pipes after welding them in advance on the ground. Applicable.

(Example of the invention)

FIG. 1 shows a welding state according to an embodiment of a steel pipe welding apparatus 10 to which the present invention is applied.

In this embodiment, a steel pipe 14 is coaxially inserted into the upper end of a steel pipe 12 already buried in the ground, and these are welded to each other at the ends.

A base plate 16 is in contact with the upper end of the steel pipe 14, and a portion near the upper end of a guide rail 18 is fixed to the base plate 16 and suspended. The guide rail 18 is hung down along the axis of the steel pipes 12 and 14, and near the upper end and at the lower end, an arm 22 and an arm 22 for accurately positioning the guide rail 18 on the axis of the steel pipes 12 and 14. A roller 24 is provided to be supported by the tip of the roller 22.

The roller 24 comes into contact with the inner peripheral portions of the steel pipes 12 and 14 so that the guide rail 18 is disposed at the axis of the steel pipes 12 and 14. For this reason, it is preferable that three or more of these arms 22 be provided at equal intervals around the axis when viewed from the axial direction of the steel pipes 12 and 14.

As shown in FIG. 2, the guide rail 18 is an H-shaped steel, and one side of the web 18A is provided with an insulating material 2 along the longitudinal direction.
An energizing plate 28 is attached via 6. This energizing plate 2
Reference numeral 8 is fixed to the entire length of the guide rail 18 in the longitudinal direction, and electrically connects the control device 30 and the welding machine 31 mounted on the base plate 16 to the respective actuators of the bogie 32 movable along the guide rail 18. It has the function of connecting to. For this reason, it is preferable that a plurality of systems, power supply lines, and signal lines are separately laid as the current supply plate 28.

A rack 34 is formed on the web 18A of the guide rail 18 on the opposite side of the current-carrying plate 28 along the longitudinal direction of the guide rail 18, and a pinion 36 that is supported by the carriage 32 meshes. The output shaft gear 42 of the motor 38 meshes with the pinion 36. The output shaft gear 42 is configured to transmit a signal from the control device 30 through the energizing plate 28. By rotating the pinion 36 by the required number of rotations, the bogie 32 is moved in the desired direction in the longitudinal direction of the guide rail 18. It can be moved to the position.

The ring 44 is attached to the flange 32A protruding from the lower end of the carriage 32.
Are supported coaxially with the axis of the guide rail 18 and are rotated by the driving force of a motor 45 installed on the carriage 32. The ring 44 accommodates the bogie 32 therein and is fixed to the outer periphery of the base block 46. A swivel plate 48 is pivotally supported by a base block 46 to rotate around an axis perpendicular to the axis of the guide rail 18 (see the center line A in FIG. 2). It is rotatable. An output shaft gear 56 of a motor 54 fixed to the base block 46 meshes with an internal gear 52 fixed to the base block 46 coaxially with the axis A, and the turning plate 48 rotates when the motor 54 rotates. It can be turned around the axis A.

A fixed arm 58 protrudes from the turning plate 48,
A welding torch 62 protrudes from the tip of the fixed arm 58. The welding torch 62 is supplied with a welding wire 66 from a wire feeder 64 installed on the base plate 16 as shown in FIG. Therefore, the welding torch 62 causes the welding wire 66 protruding from the tip of the welding torch 62 to approach the inner peripheral surfaces of the steel pipes 12 and 14 so that
And the voltage supplied to the welding wire 66 causes an arc between the welding wire 66 and the steel pipes 12, 14, so that the contact end faces of the steel pipes 12, 14 can be welded. . If necessary, a welding auxiliary gas such as carbon dioxide gas may be supplied from the tip of the welding torch 62.

The welding torch 62 can be turned around the axis A by the drive of the motor 54 to perform a weaving operation.
After welding, the welding torch 62 is turned around the fixed arm 58 and can be folded. That is, the welding torch 62 is rotatable around the pivot pin 68 to the fixed arm 58, and the output shaft gear of the motor 72 fixed to the pivot plate 48 to the gear 70 coaxially fixed to the pivot pin 68. 74 are engaged. Therefore, the rotation of this motor 72 causes the welding torch
62 rotates counterclockwise in FIG. 2 to the imaginary line state around the pivot support pin 68 and approaches the guide rail 18 so that it can be separated from the inner circumferences of the steel pipes 12 and 14.

On the ground, a motor for driving the wire feeder 64, the control device 30, and a power distributor 76 capable of supplying electric power to the welding machine 31 are provided.

An ITV camera 78 protrudes from the carriage 32 via an arm 82 so that the illumination light of the light source 84 protruding from the carriage 32 can be recognized. That is, the light source 84 is the third
Slit light, which is in the longitudinal direction in the figure, can be applied to the contact surfaces of the steel pipes 12 and 14, and the ITV camera 78 detects the slit light, and the control device 30 concentrates the welded portion on the slit light. The welding torch 62 can follow the joint surface of the steel pipes 12 and 14 by detecting the change and accurately matching the tip of the welding torch 62 to the concentration change portion.

 Next, the operation of the present embodiment will be described.

The steel pipe 12 previously buried in the ground is brought into contact with the upper end thereof, as shown in FIG. This steel pipe 14
A base plate 16 is mounted on the, and a guide rail 18 is suspended vertically along the axis of the steel pipe 14. Truck 32 is a motor
It is lowered by the driving force of 38, and the slit light from the light source 84
When the ITV camera 78 accurately detects the joint surface between the steel pipes 12 and 14, the motor 38 is stopped with the welding torch 62 corresponding to the joint surface. As described above, in the steel pipe welding apparatus 10 according to the present embodiment, since the guide rails 18 are suspended vertically along the axis of the steel pipe 14, the bogie 32 is lowered along the guide rails 18. Can be. This allows
Even if the steel pipe 14 is the vertical pipe shown in FIG.
Can be moved to the joint surface of the steel pipes 12, 14.

Here, when a current is supplied from the welding machine 31 to the steel pipe 14 and the welding wire 66, a bonding surface between the welding wire 66 and the steel pipes 12, 14 is formed and hair welding is started. The bogie 32 is turned around the axis of the steel pipes 12, 14 by the driving force of the motor 45, so that the welding operation is automatically performed on the inner circumferences of the steel pipes 12, 14. The welding torch 62 can perform a weaving operation by reciprocating the motor 54 by a predetermined angle during the welding progress. The joining surface of steel pipes 12 and 14 is steel pipe 1
The control device 30 is not always
Is controlled by the motor 38 to appropriately move the carriage 32 up and down, so that the tip of the welding torch 62 is accurately brought into contact with the joint surface of the steel pipes 12 and 14.

 Next, FIG. 3 shows a second embodiment of the present invention.

In this embodiment, concrete 88 and 90 are pre-cast with a predetermined thickness inside the steel pipes 12 and 14, respectively.
When inserting 32 into the joint surface of steel pipes 12, 14, motor 72
(See FIG. 2), the welding torch 62 is folded around the pivot pin 68 in the direction of the ring 44 and moved. When the welding torch 62 reaches the joint of the steel pipes 12 and 14, the motor 72 is again rotated in the reverse direction. The welding torch 62 is made to approach the inner peripheral surfaces of the steel pipes 12, 14.

 Next, FIG. 4 shows a third embodiment of the present invention.

In this embodiment, a state is shown in which the steel pipes 12 and 14 are in contact with each other in a horizontal state on the ground, and in this state, the contact portions of the steel pipes 12 and 14 are welded from the inner periphery.

In this state, the guide rails
Numeral 18 is arranged at the axial center of the steel pipes 12, 14, so that the welding torch 62 welds the contact surfaces while turning.

However, in this embodiment, the arm 22 and the roller 24 for supporting the guide rail 18 on the inner peripheral portions of the steel pipes 12 and 14 can be provided only below the guide rail 18 in order to support the weight of the guide rail 18.

In this embodiment, a welding torch 62 is provided on the opposite side of the ring 44 to enable quick welding.

 Next, FIG. 5 shows a fourth embodiment of the present invention.

In this embodiment, in place of the ITV camera 78 in each of the above embodiments, in order to guide the welding surface of the welding torch 62, when turning around the axis of the ring 44, it is opened to this movement locus prior to the movement locus of the welding torch 62. The leading copying section 94 moves. The groove copying portion 94 is an arm that protrudes in a radial direction from the ring 44 and has a protruding length that can be changed. A roller 96 attached to the tip portion is a chamfer formed on the contact surface of the steel pipes 12, 14. It moves along a recess in a groove. As a result, the motor 38 (see FIG. 2) is driven, and the welding torch 62 is accurately moved to the joint surface of the steel pipes 12, 14.

In addition, the slag removing means 98 moves on the movement locus of the welding torch 62 after the welding torch 62 moves. The slag removing means 98 is an arm which protrudes in the radial direction from the ring 44 similarly to the groove copying section 94, and its arm protrusion length is adjustable.
Has a role of destroying and removing the welding slag formed by the welding torch 62.

〔The invention's effect〕

As described above, the present invention relates to a steel pipe welding apparatus for welding a plurality of steel pipes to each other on a joint inner peripheral surface, the guide rail being inserted along the axis of the steel pipe, and being moved along the guide rail. A bogie, a welding torch mounted on the bogie and swiveling along the inner circumference of the steel pipe, and a welding torch by swiveling the welding torch with respect to the bogie along the joint surface of the steel pipe and moving the welding torch in the axial direction of the steel pipe. And a control means for causing the inner peripheral surface of the steel pipe to be in contact with each other to be automatically welded, and further applicable to welding of a vertical pipe. It has an excellent effect of being able to.

[Brief description of the drawings]

1 is a longitudinal sectional view showing a first embodiment of a steel pipe welding apparatus to which the present invention is applied, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a steel pipe to which the present invention is applied. FIG. 4 is a longitudinal sectional view of the second embodiment showing the welding state of the steel pipe, FIG. 4 is a longitudinal sectional view of the third embodiment showing the welding state when the steel pipe is placed on the ground in a horizontal state, and FIG. It is an axial direction perpendicular cross-sectional view at the time of arrange | positioning the steel pipe welded similarly to above. 10 ... steel pipe welding equipment, 12, 14 ... steel pipe, 18 ... guide rail, 30 ... control equipment, 32 ... truck, 62 ... welding torch, 66 ... welding wire.

Claims (1)

(57) [Claims] 1. A steel pipe welding apparatus for welding a plurality of steel pipes to each other on a joint inner peripheral surface, comprising: a guide rail inserted along an axis of the steel pipe; and a bogie moved along the guide rail. A welding torch mounted on the bogie and pivoted along the inner periphery of the steel pipe; and the welding torch is pivoted with respect to the bogie along the joining surface of the steel pipe and moved in the axial direction of the steel pipe to join the welding torch in the bogie. A steel pipe welding apparatus comprising: control means for following a peripheral surface.