JPH048151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flash welding device for connecting pipes used when laying oil, natural gas, etc. pipelines.

[Conventional technology]

Conventionally, as this type of flash welding or resistance butt welding apparatus, the one shown in Japanese Patent Publication No. 52-45652 is known. The welding device described in the publication consists of a butt welding machine and an external deburring device installed separately on a pipe conveyance line, and a hollow piston rod inserted into the pipe by a drive cart, whose inner surface is attached to the tip of a hollow piston rod. It is equipped with a deburring device. The butt welding machine is equipped with a power supply device for both pipes and a clamp device for pressure welding.

When manufacturing long pipes, the pipes placed on an inclined skid are sequentially transferred onto a conveying line and sent to a butt welding machine, and the ends of each pipe are separated by the clamping device of the welding machine. After gripping the parts and making them face each other, the pipes are joined together using automatic resistance butt welding. After welding, burrs on the inner surface of the joint are removed by an inner surface deburring device. The pipe is then moved to an exterior deburring device where the exterior surface of the joint is deburred.

[Problem that the invention seeks to solve]

A known welding device was constructed as described above. In particular, the butt welding machine and external deburring device were fixedly installed apart from each other in the pipe transport direction.
It was not possible to deburr the outer surface and deburr the inner surface at the same time, resulting in a loss of time. Furthermore, since concrete-coated steel pipes are used in submarine pipelines, the above-mentioned external clamp type butt welding machine makes it difficult to align the pipes, and the welding machine itself becomes large.

[Means for solving problems]

The pipe flash welding device according to the present invention includes:
A power supply device for the pipe and an external deburring device are mounted on a trolley so as to be separated from each other in the pipe transport direction, and a support tube can be inserted into the pipe by a drive truck, and the support tube is press-fitted to the tip of the support tube. A clamping device for this purpose, that is, a pair of pressure welding head devices and an inner surface deburring device are installed in series.

[Effect]

In the flash welding device of the present invention, a pair of pressure welding head devices are inserted into the pipe conveying line by a driving truck via a support pipe, and the pressure welding head devices are attached to the inner surface of each pipe while straddling the inside of the pipe abutting portion. grasp. The electrode of the power supply device is in pressure contact with the outside surface of the pipe butt part to supply welding power to the pipe, and when the predetermined flash time is reached, one side of the pressure welding head device is rapidly applied pressure toward the other. By moving the pipe, flash welding of the pipe is performed. After welding, the external deburring device is moved to the pipe joint, and the internal deburring device is positioned inside the joint to simultaneously remove burrs on the inner and outer surfaces of the joint.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view of an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of a main part, and FIG. 3 is a vertical cross-sectional front view taken along the line shown in FIG. 2. Note that the figure illustrates the case where an undersea pipeline is being laid, so the device of the present invention is installed on the construction ship.

The pipes P ₁ and P ₂ are made of concrete-coated steel pipes of a predetermined length, and the steel pipe portions S ₁ and S ₂ near the pipe abutting portions are exposed in advance, and are transported in the direction of arrow a by a known pipe transport device 1. Ru. A device for transferring the pipe onto the conveying device 1 is not shown, but a conventional crane, inclined skid, or the like is used.

A trolley 2 movable in the pipe transport direction below the pipe abutting part in the middle of the pipe transport device 1
is provided. A power supply device 3 and an external deburring device 4 are mounted on the cart 2 so as to be spaced apart from each other in the pipe transport direction. The power supply device 3 has an electrode 31 that is in pressure contact with the exposed steel pipe portions S ₁ and S ₂ on both sides of the pipe abutting portion, and the electrodes 31 arranged on the upper, lower, left and right sides are connected to the piston rod 3 of the hydraulic cylinder 32.
3 and opens and closes in the vertical direction. Each hydraulic cylinder 32 is attached to a ring-shaped support frame 34 provided on the truck 2 coaxially with the pipe. Note that a welding transformer (not shown) is attached to the support frame 34. The external deburring device 4 has a plurality of cutters 43 that are moved back and forth in the radial direction of the pipe by a piston rod 42 of a hydraulic cylinder 41. Hydraulic cylinder 41 with cutter 43
is attached to a rotating cylindrical body 44 that is supported coaxially with the pipe. The rotating cylindrical body 44 is rotatably supported by a frame ring 45 provided coaxially with the pipe on the truck 2, and is rotated by a motor 47 via a gear transmission mechanism 46.

Next, behind the rear pipe _P2 , a driving cart 6 for the pressure welding head support pipe 5 inserted into the pipe is arranged. The drive cart 6 moves forward and backward on the pedestal 61 in the pipe conveying direction, thereby moving a pair of pressure welding head devices 7 and an inner surface deburring device 8, which are connected to the tip of the support tube 5, to the rear pipe. _P2
Insert it from the rear end to the inside of the front pipe _P1 .

The pair of pressure welding head devices 7 each include a fixed hydraulic cylinder 71 and a movable hydraulic cylinder 72, each having an inner clamping claw 70.
A movable hydraulic cylinder 72 is slidably fitted onto a fixed piston rod 73 connected to the piston rod 1 . The base end of the fixed piston rod 73 is connected to the distal end of the support tube 5. A plurality of inner clamp claws 70 are arranged in the front, rear, and radial directions of the hydraulic cylinders 71 and 72, respectively, and are connected to an annular piston 75 via a link 74, and are connected to a support ring integral with the cylinder case via a link 76. It is connected to 77. Therefore, the passage 7 is in the first piston chamber 75a.
When pressure oil is fed through 5c, the annular piston 7
5 protrudes to expand the inner clamp claw 70 in the radial direction of the pipe and press it against the inner surface of the pipe. Conversely, when pressurized oil is fed into the second piston chamber 75b through the passage 75a, the annular piston 75 retracts, thereby causing the inner clamp claw 70 to contract in the radial direction of the pipe and separate from the inner surface of the pipe. In the movable hydraulic cylinder 72, a first chamber 78 and a second chamber are provided before and after the piston portion 73a of the fixed piston rod 73.
A chamber 79 is provided and operates as described below.

Next, the inner surface deburring device 8 includes a shear cutter 81 interposed between the fixed hydraulic cylinder 71 and the movable hydraulic cylinder 72, and a milling cutter 82 connected to the tip of the fixed hydraulic cylinder 71.
It is composed of. The shear cutter 81 attempts to shear the internal burr generated at the joint B from its root while it is still at high temperature. In this embodiment, four shear cutters 81 are provided so as to be retractable in the radial direction. That is, the shear cutter 81 has a housing 8 interposed between the fixed piston rod 73 and the fixed hydraulic cylinder 71.
0 so as to be slidable in the radial direction, and is retracted into the housing 80 by a spring 83 when not in use. The base end of the shear cutter 81 is a slope, and the piston rod 85 of the hydraulic cylinder 84 whose tip is in sliding contact with the slope is connected to the shear cutter 8.
1 and is provided in a direction perpendicular to 1. Therefore, by protruding the piston rod 85, the tip of the shear cutter 81 protrudes to the extent that it almost contacts the inner surface of the pipe.

Next, the milling cutter 82 performs finishing cutting of the inner surface of the joint after shearing by the shear cutter 81. The milling cutter 82 is mounted on a rotating shaft 87 within a partially opened casing 86. The support member 8 of this rotating shaft 87
8 is connected to a piston rod 90 of a hydraulic cylinder 89 and configured to be retractable through an opening in the casing 86. Of course, the rotational force of the hydraulic motor 91 is transmitted to the rotating shaft 87 of the milling cutter 82 via a gear mechanism 92.

Further, in order to prevent chips and the like from remaining inside the pipe after the burrs are removed by the inner surface deburring device 8, a rotating brush 101, a magnet 102, and an air blowing pipe are installed in front of the casing 86. An inner surface cleaning device 10 consisting of 103 is provided. The rotating brush 101 has a cover 105 attached to the tip of a rotating shaft 104 inserted through the center of the casing 86, and is attached to the back surface of the cover 105 so as to be in close contact with the entire circumference of the inner surface of the pipe. A rotating shaft 104 of the rotating brush 101 is driven by a motor 91 common to the milling cutter 82 via a gear mechanism 106 provided at the base end. The magnet 102 is mounted on the outer cylinder 107 of the rotating shaft 104.

The casing 86 of the inner surface deburring device 8 is provided with a head roller 93 for guiding and supporting the head portion of the support tube 5 into the pipe. Further, an electric cable 51 and a hydraulic hose 52 whose base ends are connected to a power source and a hydraulic power source (not shown) are extended into the support tube 5 via a rotary joint 53, and their base ends are connected to the drive carriage 6. An air hose 54 connected to an air machine (for example an air compressor) also extends inside the support tube 5 and is further connected to a passage provided within the body of the fixed piston rod 73. Note that a rotation device (not shown) for the support tube 5 is provided on the drive truck 6.

The pipes _P1 and _P2 are joined by flash welding using the apparatus of this embodiment as follows.

The pipe P ₁ and then the pipe P ₂ are sequentially transported by the transport device 1 so that the abutting portions of the pipes face each other directly below the power supply device 3 . Next, the electrode 31 of the power supply device 3 is brought into pressure contact with the exposed steel pipe portions S ₁ and S ₂ of the pipe abutting portion by the upper and lower hydraulic cylinders 32 . In this state, the pressure welding head device 7, the inner surface deburring device 8, and the inner surface cleaning device 10 at the tip of the support pipe 5 are inserted from the rear of the pipe _P2 using the drive cart 6, and the
Each pair of pressure welding head devices 7 is stopped at a position inside the pipes _P1 and _P2 . Next, the inner clamp claws 70 of each pressure welding head device 7 are enlarged as described above to grip the inner surface of each pipe. after that,
The power supply device 3 energizes the pipes P ₁ and P ₂ , and after a predetermined period of time has elapsed, the movable hydraulic cylinder 72 is moved to the first chamber 7 while generating a flash at the pipe abutting portion.
By supplying pressure oil to the fixed hydraulic cylinder 71, the pipes _P1 and _P2 are joined together.

Next, since burrs are generated on the inner and outer surfaces of the joint B by this flash welding, a method for removing them will be described.

First, the electrode 31 of the power supply device 3 is opened in the vertical direction, and then the trolley 2 is moved backward to position the outer surface deburring device 4 on the joint B. Thereafter, by moving the cutter 43 for removing burrs on the outer surface toward the center of the pipe while rotating it around the pipe, burrs on the outer surface of the joint can be cut off. In parallel with this external deburring work, internal deburring work is performed. That is, first, the shear cutter 81
The burrs on the inner surface of the joint are sheared from their roots at high temperatures. The shear cutting procedure using the shear cutter 81 is as follows.

Unclamp only the fixed head of the pressure welding head device. That is, the fixed hydraulic cylinder 71
All the inner clamp claws 70 on the side are reduced and separated from the inner surface of the pipe _P1 . Note that the other movable head is in a clamped state.

The shear cutter 81 is projected.

Move the fixed head to the right. As a result, the shear cutter 81 also moves to the right in FIG. 2, so that the burr on the inner surface of the joint can be sheared. Note that in order to move the fixed hydraulic cylinder 71 to the right, the first chamber 78 of the movable hydraulic cylinder 72 is
All you have to do is send pressure oil to.

The shear cutter 81 can be retracted.

Pressure oil is supplied to the second chamber 79 of the movable hydraulic cylinder 72 to return the stationary head to its original position.

The movable head of the pressure welding head device 7 is also unclamped. That is, all the inner clamp claws 70 on the movable hydraulic cylinder 72 side are reduced in the same manner as described above.

The support tube 5 is rotated by a required angle. This rotation is performed by a rotating device (not shown) on the drive carriage 6. Also, along with the support tube 5, the shear cutter 81
The reason for rotating the direction is that it is impossible to provide a shear cutter all around the inner surface of the pipe.

Clamp only the movable pressure welding head.
After that, the following steps are repeated several times (in this example, 3 times).
times) Repeat. As a result, burrs can be removed from the entire circumference of the inner surface of the joint.

After the primary inner surface deburring work is completed using the shear cutter 81, the milling cutter 82
Perform finishing cutting. After the milling cutter 82 is positioned at the joint B by the driving cart 6, it protrudes from the opening of the casing 86 while being rotated by the hydraulic motor 91 and revolved by the rotation of the support tube 5, and removes the remaining burr after shear cutting. finish it neatly.

With the above steps, the inner surface deburring work is completed.

Finally, in the process of pulling out the support tube 5 from inside the pipe, chips and debris remaining on the inner surface of the pipe are removed by a cleaning device 10 connected to the tip of the inner surface deburring device 8.

〔Effect of the invention〕

As detailed above, the present invention grips the inner surface of each pipe by a pair of pressure welding heads inserted into the pipe during flash welding, and the inner surface of the pipe is generally held with higher precision than the outer surface of the pipe. Because of this, the pipe centering operation can be performed accurately and easily using the clamp of this pressure welding head device. moreover,
Since the pressure welding head device and the power supply device are arranged separately on the inside and outside of the pipe, the clamping force of the pressure welding head device disposed on the inner surface of the pipe can be increased, and the pressure welding head device can be constructed simply and compactly. In addition, the inner surface deburring device is equipped with a shear cutter and a finishing milling cutter, so it is possible to deburr the inner surface in a short time and with high precision, and also to deburr the inner and outer surfaces after flash welding. It is efficient and easy to use.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of an embodiment of the present invention, FIG. 2 is a longitudinal sectional front view of main parts, and FIG. 3 is a longitudinal sectional front view taken along the line shown in FIG. 2. 1: Pipe conveyance device, 2: Dolly, 3: Power supply device, 4: External deburring device, 5: Support pipe, 6: Drive truck, 7: Pressure welding head device, 8: Internal deburring device.

Claims (1)

[Claims] 1 A trolley located below the abutting part of the pipes placed on the pipe transport device and movable in the pipe transport direction, and a power supply device and an external burr mounted on the trolley at a distance in the pipe transport direction. a removing device;
The pressure welding head device is equipped with a drive carriage for a pressure welding head support pipe inserted into the pipe, and a pressure welding head device and an inner surface deburring device connected to the tip of the pressure welding head support pipe, and the pressure welding head device grips the inner surface of each pipe. The inner surface deburring device includes a shear cutter for shearing burrs on the inner surface of the pipe. A pipe flash welding device comprising a rotationally driven milling cutter.