JPS5992178A - Pipe inside face welding machine - Google Patents

Abstract

PURPOSE:To execute exactly welding along a joint from the inside face even in case of a small diameter pipe by stabilizing a welding torch of the tip of a leading-in bar by a draw bar from a pipe outlet side, controlling its position to a linear joint of the pipe, and moving it. CONSTITUTION:A draw bar 93 is advanced to the maximum and its tip part is fixed so as to be freely attachable and detachable to and from a frame 20 of a welding operating part W in order to stabilize the operating part W, a leading-in part 10 is advanced, a drawing part 90 is moved back synchronously, and the operating part W is led gradually into a pipe A. A shift from a pipe joint of the tip of a welding torch 50 is observed by a TV camera 71 of a horizontal movement control part 70, and a horizontal moving base 33 is controlled as to its movement in the horizontal direction being parallel to the pipe horizontal diameter direction. Also, welding is executed, move-controling up and down the torch on a vertical moving base 41 by a vertical movement control part 80, and when the welding is executed to an outlet of the pipe A, the operating part W moves backward. When the operating part W comes out of an inlet of the pipe A, engagement of the bar 93 to the frame 20 is released, and the drawing part 90 moves backward.

Description

[Detailed description of the invention] The present invention applies to the inner surface of the pipe.

In the welding pipe manufacturing process, the -C%'Fi) plate is bent into a perpendicular shape, and then the straight I↓-to is temporarily welded, but this temporary welding may cause the pipe to become twisted or cause damage to the pipe.
1 (A bending phenomenon occurs. Therefore, this pipe is connected.)
It is difficult to weld from the inside along the pipe, and was conventionally considered impossible with small diameter pipes.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe inner welding machine capable of accurately welding from the inner surface along the joints even in the case of small-diameter pipes, while eliminating the above-mentioned drawbacks.

The present invention will be explained below based on an embodiment shown in the drawings.

In FIG. 1, a pipe A to be welded is supported on a support leg 1 in a horizontally extending state. The configuration of the present invention can be roughly divided into a welding operation section W having a torch 50.
, an introduction part 10 that is attached to the tip of a horizontally long introduction rod 13 and extends from the inlet side of the nozzle tube A, and a tension part 90 that pulls out the welding operation part W at the outlet side of the pipe A. include.

In the introduction part 10 of H1I, the rail 11 is Noguib A.
The self-propelled trolley 12 is installed parallel to the longitudinal direction of the
is mounted so that it can freely move back and forth. The opposite end of the long introduction rod 13 parallel to the axis of the pipe (III) is supported on the trolley 12 so as to be swingable around a horizontal axis, and the end on the side of the pipe A is movable up and down. It is supported by support rollers 14.

The welding operation section W includes a frame 20 fixed to the end of the introduction rod 13 on the pipe A side, a horizontal moving section 30 that moves the torch 50 described later in the diameter direction within the pipe A, and a vertical moving section that moves the torch 50 up and down. It consists of a moving part 40, a torch 50, a welding body 60, and a lateral movement control part 70 for adjusting the lateral movement of the torch 50 (above).

In the lateral movement section 30, a horizontal arm 31 is fixedly protruding from the side surface of the frame 20 in parallel to the diameter direction of the vibe A, and there are screws r'11s31as in the middle and sliding guide cylinders 1' on both sides. tK 31 L+.

A nut member 32 having an external gear is screwed into the threaded portion 31a, and the nut member 32 is rotatably supported by a lateral movement table 33 surrounding the nut member 32. Below the supports 4 and 4! 31 and on the sides of the lateral movement table 33 in the axial direction of the pipe A, lateral movement guide rods 34, 34 are protruded and fixed in parallel with the support body 31, and are fastened to the frame 20. One movement is connected freely. Further, a lateral movement motor 35 is installed on the lateral movement table 33, and a gear 36
The nut part 32 is rotated through the .

A vertical movement table 41 is provided on the rear side of the horizontal movement table 33 (side surface of the introduction rod).
is mounted so as to be slidable in the vertical direction, and is raised and lowered by a vertical movement motor 42 via a pinion 43 and a rack 44.

A torch 50 is set downwardly on the vertically movable table 41, and a welded body 60 is held in the vicinity thereof via a holding part 80.

In addition, in the lateral movement system <111 section 70, a TV camera 71 is mounted on the front side of the frame (on the opposite side of the introduction tube) in a posture that allows it to photograph the tip of the torch, and its II7. A first filter 72 is fixed to the frame 20 at the front, and furthermore, a second filter 73 is provided on the frame near the torch 50 at a distance from it. Also, x: r, c movement system t
1 (as a part, the distance between the tip of the torch 50 and the inner surface of the vibrator A is detected by a detector, and the signal is sent to the cF movement motor 42 so that the signal value becomes the set value) .In addition, the TV receiver ('≦! tube (1 n 1 not shown) is installed (lifted) on the outside (+ill) of the vibrator A.

In the tension section 90, a rail 91 is placed on the exit side of the vibe A parallel to its axis (F32 ftK), and a trolley 9 is placed on top of it.
2 is mounted so as to be able to reciprocate freely, and a tension rod 93 is attached to it in a horizontal state with the anti-vibrator A (IIjI Ohm portion fixed).In addition, as a reciprocating drive part of the trolley 92, a sprocket is installed on the rail side. A chain lube is formed by the chain lube 9a and the chain lube 9b, and a driven sprocket 9c that engages with the chain lube is rotatably provided on the truck side.

The frame 20 at the tip of the introduction rod 13 and the tension rod 93 are detachably connected. That is, a cylindrical portion with a lip 21 and a locking member 4 which is closed or opened by the movement of the piston 3a by the piston cylinder 81 mechanism 3 are attached to the tip of each of the pistons.

Next, the operating state will be explained above.

In a state where the introduction rod 13 is in the most retracted state and the welding operation part W is located at the artificial surface n11 of the pipe A,
The tension rod 93 is moved forward the most and its tip is welded to the operating part W.
It is removably fixed to the frame 20 of the welding operation part W to ensure stability of the welding operation part W. In this state, the carriage 12 of the introduction section is advanced, and the carriage 92 of the tension section 90 is synchronously retreated. Then, the welding operation part W is gradually introduced into the pipe A.

The displacement of the tip of the torch 50 from the joint of the vibrator A is observed using a cathode ray tube B (FIG. 6) installed outside the pipe A, and if the tip of the torch 50 is displaced from the joint, the lateral movement motor 35 is rotated forward or reverse by a switch or the like. What is particularly noteworthy here is that the second filter 73 is provided near the torch 50, so most of the multi-needle light from the incandescent electrode C and arc D is blocked. A small amount of remaining light leaks from the gap S between the lower end of the second filter 73 and the inner surface of the pipe A. Since the first filter 72 is installed just in front of the TV camera 71, the weld bead E can be clearly photographed by blocking the light emitted from the gap S. Electrode C and arc D are clearly shown.

When the welding continues in this manner and the pipe A is welded to the outlet, the carriage 12 and the carriage 92 move in the opposite direction, and the welding operation part W retreats. At this time, the quality of the bead E is inspected through the TV camera 71. Then, when the welding operation part W comes out from the pipe A, the tension rod 93 is released from the frame 20, and the truck 92 is moved backward.

As the lateral movement section 30 of the welding operation section, instead of the screw section 31a and the nut member 32, a rack and a pinion that engage with each other or other mechanisms for changing rotational interlocking to direct IgA interlocking may be used. Similarly, η is also used in the vertical movement section 40 to change other rotational interlocking to linear interlocking.

A current detector, a magnetic sensor, or the like is used instead of the voltage detector of the vertical movement control section 80. Furthermore, as a light receiving section,
Instead of an RV camera, an optical lens part, an optical fiber, etc. of the camera is attached to the frame, and the light from it is guided outside the pipe.

The present invention is not limited to the above examples, but is particularly applicable to 1f18Nt
'The scope of the request includes unscrupulous variations within the range described.

Since the present invention has the above ηif <'ti'j,
Even small-diameter pipes can now be welded easily, accurately, and with good quality from the inside surface along the joint. This improved the quality of welded pipes and helped reduce costs.

[Brief explanation of the drawing]

1 IN is a front view showing one embodiment of the present invention, FIG. 2 is an enlarged front view of main parts, FIG. 3 is a plan view of FIG. 2, FIG. FIG. 6 is an enlarged cross-sectional view of the main part showing the state of connection between the introduction rod and the tension rod, and FIG. 6 is an image showing the inner welded portion. A...pipe, W...welding operation part, 10. introduction part,
20... Frame, 30... Horizontal moving unit, 33... Horizontal moving table, 40... Vertical moving unit, 41... Vertical moving table, 50...
... Torch, 60... Welding rod, 70... Lateral movement system i
'llllt'? ls 171...TV camera, 72
...first filter, 73...second filter, 80.
・Longitudinal movement control section, 90・Tension section, 94...Drive section

Claims (3)

[Claims] (1) The torch is mounted on the frame so as to be displaceable relative to the pipe, and a lateral movement control section adjusts the movement of the torch in the lateral direction parallel to the horizontal diameter direction of the pipe. and a welding actuating part having a vertical movement control part that adjusts the movement (detour) of the torch in the vertical direction, and the welding actuating part is attached to the tip of a horizontally long introduction rod and is introduced and removed from the inlet side of the pipe. A pipe inner surface welding machine comprising: an introduction part configured as shown in FIG. . (2) The torch lateral movement control section includes a light receiving section mounted on the frame so as to obtain an image of the tip of the torch and the welding part, a first filter mounted immediately in front of the light receiving section, and a first filter mounted immediately before the light receiving section; Claim 1 comprising a second filter installed near the torch and a picture tube installed outside the pipe.
Pipe inner surface welding machine listed in section tr'r. (3) The welding operation part is to hold the torch directly in the pipe.
. +k M' i!, which has a horizontal movement section (119) for moving in the direction of +k M' i! A pipe inner surface M welding machine according to item 2 of the range of j'J requirements.