JPS5935716B2 - automatic pipe welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding device for welding narrowly spaced tubes while fixing the tubes and rotating a welding head along the circumference of the tubes.

Conventionally, in this type of welding work, it was difficult for the operator to shift his hands due to the narrow spaces between the pipes, so welding was performed intermittently using a welding rod through the small gaps between the pipes. The welding work was carried out in an extremely unnatural and unstable position, as the pipes were being welded to each other. In this case, automatic welding equipment may have been used, but because the distance between the pipes to be welded was narrow, it was difficult to fix the welding equipment to the pipes to be welded.
For example, a conventional automatic welding device as shown in FIG. 1 is equipped with a clamp claw 4' that can be opened and closed, and the pipe to be welded 1' is clamped with this clamp claw 4'. However, the clamp claw 4' cannot be removed from the pipe to be welded unless it is retracted by at least a distance l between the pipes.
If the distance between the two is narrow, the clamp claw 4' must be made thinner. However, the clamp claw 4' cannot be made unnecessarily thin, and there is a limit to how narrow the clamp claw can be to ensure the mechanical strength necessary to support the welding equipment. The spacing between the welding tubes is limited by the retracting distance of the clamp claws 4', and welding cannot be performed in the case of pipes to be welded that are arranged at extremely narrow intervals. Furthermore, in FIG. 1, when adjusting the position of the welding device with respect to the pipe to be welded 1', the clamp claw O is released from the pipe to be welded 1', but in this case, the welding device and the pipe to be welded 1' are Since the engagement is completely lost, the welding device may slip off the pipe to be welded, or the pipe to be welded
’.

Therefore, when adjusting the position of the welding device, the operator has to open and close the clamp claw 1 while supporting the welding device, which is extremely inconvenient. In this case, if the welding equipment was not properly supported, the welding equipment would fall and not only break the welding equipment itself, but also cause injury to the workers. SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic pipe welding apparatus that eliminates the above-mentioned conventional drawbacks and is capable of welding even pipes to be welded that are arranged at narrow intervals.

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

In FIGS. 2 to 9, 1 is a pipe to be welded, and 2 is a first housing. This housing 2 has a drive ring 6 divided into two parts inside thereof so that it can rotate in the circumferential direction of the pipe to be welded 1. It is held in

A second housing 3 is paired with the first housing 2, and like the first housing 2, this housing 3 also has a two-split drive ring 6 that can be rotated in the circumferential direction of the pipe to be welded 1. It holds like that.

4, 4 are the first,
A pair of first clamp claws 5, 5 are attached to the second housings 2, 3 and abut against the pipe to be welded, and the first clamp claws 5, 5 are held and positioned by the first and second housings 2, 3. This is an adjustment screw for the clamp claws 4, 4.

The adjustment screws 5, 5 are screwed into the first clamp claws 4, 4, and when these adjustment screws 5, 5 are rotated, the first clamp claws 4, 4 are connected to the first and second housings. 2 and 3 while sliding in the radial direction of the tube 1. These first clamp claws 4, 4 and adjustment screws 5, 5 constitute a first positioning mechanism A for the housing.
6, 6 are held inside the first and second housings 2, 3 so as to be rotatable in the circumferential direction of the pipe to be welded 1.
It is a split drive ring.

When these driving rings 6, 6 are combined, they are formed into a circular shape having a gear 6a on the outer peripheral surface. A worm 8 is meshed with this gear 6a, and the worm 8 is a rotary driving electric motor supported by the second housing 3. It is designed to be rotationally driven by. These gears 6a) worm 8, electric motor 7 drive rings 6,6
Rotation drive mechanism B for rotating around the outer periphery of the pipe to be welded 1
is configured. 9 is a welding torch supported by the drive ring 6, 10 is a welding electrode, and 11, 11 are tightening bolts for integrally connecting the first and second housings 2 and 3, which are divided into two parts.

These tightening bolts 11, 11 and tightening bolts 11, 11
1) To connect the first and second housings 2 and 3 to the body through holes provided in the second housings 2 and 3 and threaded holes into which the tightening bolts are screwed. A clamp mechanism C is constructed. Further, a concave groove 31 is provided on the end face of the first housing 2 and the second housing 3, which forms a circular shape when these housings are joined together. This concave groove 31 forms a part of a second positioning mechanism D, which will be described later. 4 and 5 show a first configuration example of the main part of the second positioning mechanism D. In these J figures, 20 is open in one direction, and the welded pipe 1 is located in the center. This is a housing support member having a notch that can accommodate the following.

This housing support member 20 has a convex engaging portion 1 corresponding to the concave groove 31 of the first and second housings 2 and 3.
9, and a dovetail groove 32 located on the opposite side of the engaging portion 19.
and is provided. The dovetail groove 32 provided in the housing support member 20 is divided into two parts by a cavity provided in the center thereof, and the cavity in the center of the dovetail groove is divided into two parts. An enlarged portion 33 provided at the center of the bolt 26 extending in the longitudinal direction is rotatably fitted. Thereby, the bolt 26 is supported so that it can only rotate. Reference numerals 23 and 23a denote second and third clamp claws each having a dovetail-shaped protrusion at one end that is slidably fitted into the dovetail-shaped groove 32 of the housing support member 20. A screw hole is provided approximately at the center of the protrusion.

The second and third clamp claws 23 and 23a are screwed into the threads of the bolt 26 rotatably supported by the housing support member 20, and by turning the bolt 26, the pipe to be welded 1 can be clamped. It is now possible to unclamp it. In this case, the screw holes into which the second and third clamp claws 23 and 23a are screwed are set as right-handed threads and left-handed threads, and the second and third clamp claws 23 and 23a are screwed together by rotation of the bolt 26. It goes without saying that the objects should be moved toward or away from each other at the same time. Next, Figure 6 and ? The figure shows a second configuration example of the main parts of the second positioning mechanism D. In the figure, 21 is a housing support member that is open in one direction and has a notch in the center in which the tube to be welded 1 can be accommodated.

In this case as well, the housing support member 21 includes first and second
A convex engaging portion 19 corresponding to the concave groove 31 of the housings 2 and 3 is provided. 24 and 24a are second and third clamp claws, and these second and third clamp claws 24 and 24a are connected to the pin 2 at approximately the center of each of the second and third clamp claws.
8 and 28, the pipe to be welded 1 is pivotally supported by the housing support member 21 so as to be rotatable substantially in the radial direction.

Further, a proc 2 is attached to one end of the third clamp claw 24a.
9 is rotatably supported in the radial direction of the pipe to be welded 1. A bolt 27 having a thread at its tip is rotatably supported on this block 29, and a nut 30 rotatably provided at one end of the second clamp claw 24 is attached to the screw at the tip of the bolt 27. are screwed together. Therefore, Bolt 2? When rotated, the second and third clamp claws 24
and 24a is inverted around the pins 28, 28 as the center of rotation,
The pipe to be welded 1 is clamped or unclamped. FIGS. 8 and 9 show a third configuration example of the main part of the second positioning mechanism D used in the present invention. In these figures, 22 is open in one direction and is covered with a central part. The housing support member 22 has a notch in which the welded pipe 1 can be accommodated.
A convex engaging portion 19 corresponding to the concave groove 31 of the housings 2 and 3 and a protruding portion 34 projecting to the opposite side of the engaging portion 19 are provided.

A screw 35 is screwed into the protrusion 34 of the housing support member 22 at a substantially central position, and a hole 36 is bored at a position near the end of the protrusion. Housing support member 22
A bolt 16' that rotatably supports a third clamp claw 17 disposed on the side of the pipe to be welded 1 is screwed into the screw hole 35. Furthermore, a second L-shaped clamp claw 25 is rotatably attached to the hole 36 bored in the housing support member 22, and when the second clamp claw 25 is rotated, the end portion of the second clamp claw 25 is The provided claw 25b is adapted to engage with the pipe to be welded 1. Note that the second clamp claw 25 is attached to the housing support member 22 so that it can only rotate. After the lever 25a provided at the end of the second clamp claw 25 is used to direct the claw 25b at the other end of the second clamp claw 25 in the tangential direction of the pipe to be welded 1, the bolt 16 When ' is rotated, the pipe to be welded 1 is moved between the third clamp claw 17 and the claw 25b.
It is held between the two.

Further, after loosening the bolt 16', the housing support member 22 can be released from the welded tube 1 by manipulating the second clamp claw 25 so that the claw 25b faces the longitudinal direction of the welded tube 1. . Figures 4 to 9 are attached to the device in Figure 3.
When performing welding by applying any of the main parts of the second positioning mechanism D shown in the figures, the main parts of the second positioning mechanism D shown in FIGS. After coupling one of them to the pipe to be welded, the first housing 2 is inverted approximately 180 degrees while engaging the groove part on the lower surface of the first housing with the engaging part 19 of the housing support member, and then , while engaging the grooves on the lower surface of the second housing 3 with the engaging portions 19 of the housing support members 20, 21, 22, turn the tightening bolts 11 (5) to integrally connect the first and second housings. .

In this case, the positions of the first clamp claws 4, 4 are adjusted by the adjustment screw 5 so that the first and second housings are fixed to the pipe to be welded by the first clamp claws 4, 4,
Alternatively, after connecting the first and second !0 housings together with the tightening bolt 11, turn the adjustment screw 5 to
It is also possible to fix the second housing to the pipe to be welded. In addition, contrary to the above, the engaging part 15 of the housing support member is made into a concave groove, and the lower surfaces of the first and second housings are provided with convex protrusions corresponding to the engaging part 19, so that both Of course, it is also possible to engage them.

Further, the degree of freedom of the engagement portion between the first and second housings and the housing 40 support member is increased, and the second positioning mechanism that clamps the welded tube allows the first and second housings to be welded to the welded tube. The first and second housings may be positioned on the pipe to be welded by a first positioning mechanism provided in the first and second housings after determining the approximate relative position with respect to the first and second housings.

In this case, the engaging portions between the first and second housings and the housing support member may be configured with pin holes having a large degree of freedom.

Furthermore, the engaging part 19 of the housing support member is not provided all around the housing support member, but is provided only in a part of the housing support member, and configured to engage with either the first housing or the second housing. You can also do it. However, in order to reduce the possibility that the first housing will fall during the process of attaching and detaching the welding device to the pipe to be welded, it is necessary to attach the engaging portion 19 of the housing support member to both the first housing and the housing support member. Preferably, they are engaged. Also, in FIG. 8, the third clamp claw 1? Instead of being moved by the bolt 16', it can also be moved by spring pressure. It goes without saying that the welding apparatus according to the present invention can be used in all positions including the horizontal position.

As described above, according to the welding device of the present invention, the welding device can be easily and safely positioned on the pipe to be welded, so the welding efficiency can be significantly improved, and the welding device can be arranged at narrow intervals. It has the advantage that it can also be used for welded pipes. In particular, the present invention includes a drive ring for fixing the first and second housings to the C-pipe to be welded;
A second housing support member having an engaging portion that engages with at least the first housing is fixed to the pipe to be welded.
A positioning mechanism is provided, and after the first and second housings are fixed to the pipe to be welded, the second positioning mechanism can be removed from the pipe to be welded, thereby improving workability. can be done, and the benefits are great.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of a conventional device, Fig. 2 is a partially sectional view showing an embodiment of the present invention, and Fig. 3 shows the second positioning mechanism shown in Figs. 4 to 9. 4, 6 and 8 are front views, 5 and 1 respectively showing different modifications of the second positioning mechanism. and Figure 9 are Figures 4 and 6, respectively.
FIG. 9 is a side view of FIG. 1...Pipe to be welded, 2...First housing, 3...Second housing, 4...
...First clamp claw, 6...Half-split drive ring, 9...Welding torch, 10...
Welding electrode, 11... Tightening bolt, 20, 21,
22...Housing support member, 19...
- An engaging portion of the housing support member that engages with the housing;
23, 24, 25...Second clamp claw, IT
, 23a, 24a...Third clamp claw, A.
...First positioning mechanism, B... Rotation drive mechanism, C... Clamp mechanism, D...
Second positioning mechanism.

Claims (1)

[Claims] 1. Half-shaped drive rings 6, 6 to which a welding torch 9 that rotates around the outer periphery of the pipe to be welded is attached, a half-shaped first housing 2 that rotatably guides the drive ring 6, and the drive A half-split second housing 3 that rotatably guides the ring 6 and is paired with the first housing 2, and a second housing 3 that is mounted on the second housing 3 and connects the drive rings 6, 6 to the pipe to be welded. a rotation drive mechanism B that rotates the first and second housings together, a clamp mechanism C that integrally couples the first and second housings together, and a first and second housing 2 that are integrally coupled by the clamp mechanism C; 3 for the housing having at least one pair of radially movable first clamping pawls 4, 4 supported on said first and second housings 2, 3 for positioning the first clamping pawls 4, 4 on the pipe to be welded; A housing support member (20, 21 or 22) that is open in one direction and has a notch in the center that can accommodate a pipe to be welded; A second clamp claw (20, 21 or 22) that is pivotally supported by the member (20, 21 or 22) and comes into contact with and separates from the pipe to be welded.
17, 23, or 24), and a third clamp claw (23a) that is pivotally supported by the housing support member at a position opposite to the second clamp claw across the pipe to be welded, and comes into contact with and separates from the pipe to be welded. , 24a or 25b), the housing support member (20, 21 or 22) and the first housing 2
An engaging portion (31
and 19). An automatic pipe welding device characterized by comprising a second positioning mechanism D configured by: and 19).