DE102008036508A1 - Device for connecting ribbed tube with isosceles-curved tube using welding seam, where ribbed tube is fixedly clamped and curved tube is fixed relative to the ribbed tube, comprises welding nozzle, by which welding seam is introduced - Google Patents

Abstract

The device for connecting a ribbed tube (3, 5) with an isosceles-curved tube by using a welding seam, where the ribbed tube is fixedly clamped and the curved tube is fixed relative to the ribbed tube, comprises a welding nozzle (2), by which the welding seam is introduced for connecting the tubes. The ribbed tube is rotatably clampable in a clamping device around its longitudinal axis. The welding nozzle is fixed at the end of a supporting arm (1). The supporting arm is pivotable around the axis of the welding nozzle (7). The pivotation of the supporting arm takes places around 180[deg] . The device for connecting a ribbed tube (3, 5) with an isosceles-curved tube by using a welding seam, where the ribbed tube is fixedly clamped and the curved tube is fixed relative to the ribbed tube, comprises a welding nozzle (2), by which the welding seam is introduced for connecting the tubes. The ribbed tube is rotatably clampable in a clamping device around its longitudinal axis. The welding nozzle is fixed at the end of a supporting arm (1). The supporting arm is pivotable around the axis of the welding nozzle (7). The pivotation of the supporting arm takes places around 180[deg] from a point, which lies vertical to the rotation axis of the ribbed tube. The pivoting plane of the supporting arm lies vertical to the axis of the welding nozzle. The supporting arm is horizontally arranged and the welding nozzle seated at the supporting arm assigns vertically downward. The supporting arm of the welding nozzle is formed as shank of a U-shaped holder and the holder is pivotably mounted around the axis of the welding nozzle. The lower shank of the holder is formed as supporting arm of the welding nozzle. The clamping device is provided for clamping two tubes arranged parallel to each other. The clamping device carrying the tubes is rotatable around the axis of the one of the tubes, where the curved tube is directly welded to the ribbed tube. An independent claim is included for a method for operating a device.

Description

The The invention relates to a device for connecting a pipe, in particular a finned tube, with an isosceles 180 ° elbow using a weld, the pipe being firmly clamped, the pipe bend relative to the pipe fixed and then the weld applied by means of a welding nozzle becomes. About that In addition, the invention relates to a method of operation such a device.

It are various applications, in which heat exchanger tubes are to be installed in boiler. The heat exchanger tubes, Preferably finned tubes, in rows in parallel arrangement installed, with the free ends of the tubes with 180 ° elbows with each other be connected so that, for example, cooling water, the heat exchanger tubes can pass through a row of pipes in succession.

The Connecting the individual heat exchanger tubes by means of the pipe bends done by welds, the due to the relatively problematic geometry of the pipes and pipe bends by hand be pulled, with multiple times the burner position changed and the welding process must be interrupted. Such a welding process is relatively expensive, requires a heavy load of welders and does not always lead to impeccable Welds. The quality the welds suffers especially because the weld is rigidly clamped Tubes executed is, so partially over Head must be worked and the weld interrupted several times over the circumference becomes.

Of the Invention is the object of the workload in the Production of welds such To reduce pipe connections while improving the quality of the welds.

According to the invention this Task solved by that the respective pipe, which are connected to the pipe bend is to be rotatably clamped in a clamping device about its longitudinal axis is that the welding nozzle at the end of a Support arm is attached, that the support arm is pivotable about the axis of the welding nozzle is that the pivoting of the support arm from a position about perpendicular to the axis of rotation of the tube is about 180 ° and that the pivoting plane of the support arm is approximately perpendicular to the axis the welding nozzle is located.

With Help the device of the invention is it is possible the weld fully automatically in one go via a little more than 360 °. It is no manual labor is required, and the welding nozzle can due to the rotation of the pipe constantly working on the tube top, so that an optimal weld can be achieved with little effort. by virtue of the pivoting of the welding arm it is readily possible, the disturbing to avoid the adjacent end of the pipe bend.

Preferably is the receiving the welding nozzle Support arm arranged substantially horizontally, with the at the Support arm fitting welding nozzle, for example pointing vertically downwards. In this embodiment, welding is accurate in the highest Point of the pipe ends to be connected together continuously possible, thereby the goodness of Weld still encouraged becomes.

In a particularly advantageous construction of the support arm of the welding nozzle is designed as a leg of a U-shaped holder, wherein the holder is pivotally mounted about the axis of the welding nozzle. Suitably, the lower leg of the U-shaped bracket is as a support arm of the welding nozzle ( 13 ) is trained. The U-shaped bracket, in which the legs in the installed state run approximately horizontally, can be easily pivoted and creates enough space for a weld around the pipe from about 370 ° to 380 °.

The Clamping device according to the invention can also for clamping two or more parallel to each other Be provided tubes, wherein the tubes carrying the clamping device each is rotatable about the axis of that tube, to the straight the pipe bend welded shall be.

To the method according to the invention for Operating a device mentioned above, the welding process fully automatic and continuous over the entire peripheral area of the pipe over slightly more than 360 °, with the Support arm with the welding nozzle in one Position of the pipe is applied, at which the currently unswelded end of the pipe bend on the side facing away from the working end of the welding nozzle lies.

Preferably becomes welding process performed with vertically downwardly directed welding nozzle.

In such an operation, the welding operation may begin in a position of the pipe in which the currently not be welded end of the pipe bend is just above the welding area, while the tube to be welded to the pipe continuously to something more rotates 360 ° until the welding process is complete, with the support arm pivoted about 180 ° around the axis of the welding nozzle after the pipe has rotated at least 90 °, but no more than 270 °.

The Pivoting the support arm can thereby continuously with the tube rotation respectively. Alternatively, it is also possible that the pivoting of the Support arm when reaching a certain angular position of the rotating Pipe is made abruptly.

The The invention is illustrated by way of example in the drawing and in the following described in detail with reference to the drawing. Show it:

1 an arrangement of two superimposed finned tubes in which the lower tube is welded to a 180 ° tube bend;

2 in an enlarged view the left portion of the tubes according to 1 with the welding device;

3 the two pipes according to 1 after a turn of approx. 90 ° counterclockwise;

4 the two pipes according to 3 after a further rotation of about 225 °, wherein the support arm of the welding nozzle has been pivoted by 180 ° clockwise; and

5 a further embodiment of the device according to the invention, in which the support arm of the welding nozzle is seated on a U-shaped holder.

In the 1 to 4 the process according to the invention is explained in a very general form. Of the welding device is only a support arm 1 shown a welding nozzle 2 wearing. This is done, for example, according to the TIG welding process. With the help of the welding nozzle 2 gets to the left end of a finned tube 3 an isosceles 180 ° bow 4 welded. The pipe bend 4 Already has a weld with another finned tube 5 be connected. This compound has been made in a previous operation. The finned tube 5 already has another pipe bend on its opposite side 6 on, in a previous operation to the finned tube 5 has been welded.

Welding of the pipe bends 4 and 6 to the respective finned tube 3 respectively. 5 takes place fully automatically and continuously over the entire peripheral area of the respective tube 3 respectively. 5 , where over a circular arc of slightly more than 360 ° is welded.

At the beginning of the welding process, the two finned tubes 3 and 5 placed in a clamping device, not shown in the drawing, in which they are clamped in approximately horizontal arrangement next to each other at the predetermined distance. Then then the pipe bend 4 by means of a further clamping device, also not shown, relative to the two finned tubes 3 and 5 fixed. Subsequently, the from the two finned tubes 3 and 5 as well as the pipe bend 4 existing unit by means of the clamping device in a clockwise direction in the in 1 pivoted position shown in the finned tube 5 in a parallel arrangement above the finned tube 3 is arranged. Then the side of the arm moves 1 with the welding nozzle 2 a, and it starts the welding process, at which the lower end of the pipe bend 4 to the ribbed tube in the drawing below 3 is welded. Immediately after the beginning of the welding process, the entire unit is wound around the central axis of the pipe 3 turned counterclockwise. After about 90 °, the unit takes the in 3 shown position.

The only schematically illustrated support arm 1 is around the central axis 7 the welding nozzle 2 pivotable. From the in 3 shown position on the support arm 1 be pivoted in the clockwise direction by 180 °. The pivoting can be carried out relatively quickly in one operation, but it is alternatively also possible, the pivoting gradually with the further rotation of the unit about the axis of the tube 3 to accomplish.

After another rotation of the clamping device to about 225 ° take the tubes 4 and 5 in the 4 shown position, wherein the support arm 1 opposite to his position in 3 is pivoted about 180 °. The finned tube 3 around which the clamping device rotates is behind the finned tube 5 covered. In this position, the weld is continuously drawn around a circular arc of about 315 °. The clamping device rotates the two tubes 3 and 5 then another 45 °, until they are back in 1 shown position, but then the support arm 1 is arranged on the opposite side. To complete the welding process, the pipes become 3 and 5 still further rotated by about 10 ° to 20 °, so that the weld ends overlap each other. In this complicated rotation process, the support arm comes 1 , at the free end of the welding nozzle 2 sits, in no position with the pipes or the pipe bend to be welded in collision.

Following the same pattern can also be a single pipe bend 6 to a single finned tube 5 be welded. Such a prefabricated part is used, for example, for the unit in 1 used.

Finally is it also possible larger units connect to each other, wherein the clamping device, the unit then always about the axis of that finned tube rotates on whose end a pipe bend to be welded.

At the in 5 illustrated embodiment, a pipe bend 8th to the ends of the same diameter 9 and 10 two finned tubes 11 and 12 be welded. For this purpose, the two finned tubes 11 and 12 fixed in a clamping device, not shown in the drawing, initially in a horizontal arrangement parallel to each other. At the same time, the pipe bend 8th brought by means of a clamping mechanism, not shown in the drawing in that position and fixed in this, in which he to the ends 9 and 10 to be welded.

The welding nozzle 13 sits on one leg 14 a U-shaped bracket 15 , The U-shaped bracket 15 is arranged so that the bridge 16 is arranged vertically, wherein the support arm for the welding nozzle 13 forming thighs 14 lies down and the upper leg 17 with its free end over a bearing 18 rotatable and drivable on a stationary bracket 19 is attached.

At the beginning of the welding process, first the two finned tubes 11 and 12 placed in the clamping device, not shown in the drawing and fixed in this. At the same time, the pipe bend 8th relative to the ends 9 and 10 the finned tubes 11 and 12 with which he is to be connected. Then that gets under the thigh 14 seated welding nozzle 13 at the top of the pipe ends to be joined together directly above the separation gap 20 positioned in which the weld is to be pulled. The arm for the welding nozzle 13 forming lower thighs 14 the U-shaped bracket 15 stands perpendicular to the axis of the finned tube 12 outward.

In this prepared position, the clamping device rotates with the two finned tubes 11 and 12 about 90 ° counterclockwise about the axis of the finned tube 12 , which in the next operation with the adjacent end of the pipe bend 8th should be welded. This position is roughly the same as in 1 shown position of the two finned tubes 3 and 5 However, where the arm forming the support arm 14 from the opposite side between the two tubes 11 and 12 intervenes. This position and the following positions are not shown in the drawing.

After starting the welding process and rotation back into the in 5 shown position, the U-shaped holder 15 around the through the welding nozzle 13 extending vertical axis of rotation of the holder 15 rotated by 180 °, preferably over the pipe bend 8th away, because there is the most room in this area. The pivoting by 180 ° can be done spontaneously or gradually with the rotation of the clamping device, however, the 180 ° pivoting of the U-shaped holder 15 must be completed at the latest when the clamping device has rotated from the initial position by about 315 °.

After a rotation of the clamping device by 360 ° engages the pipe end 9 of the finned tube 11 in the free space between the thighs 14 and 17 the U-shaped bracket 15 and even beyond the angle of 360 ° even further into the U-shaped bracket 15 in the direction of the jetty 16 be further rotated so that a weld by more than 360 °, for example 370 ° or 380 °, is possible.

Also in this embodiment are any number of finned tubes in subsequent sequence with pipe bends welded.

1

Beam

2

welding nozzle

3

finned tube

4

Elbows

5

finned tube

6

Elbows

7

axis the welding nozzle

8th

Elbows

9

The End a finned tube

10

The End a finned tube

11

finned tube

12

finned tube

13

welding nozzle

14

lower Leg (support arm)

15

U-shaped bracket

16

web

17

upper leg

18

camp

19

bracket

20

separating gap

21

axis of rotation

Claims (10)

Device for connecting a pipe, in particular a finned tube, with an isosceles 180 ° pipe bend by means of a weld, wherein the pipe is firmly clamped, the pipe bend fixed relative to the pipe and then the weld is applied by means of a welding nozzle, characterized in that the pipe ( 3 ; 12 ) rotatable in a clamping device about its longitudinal axis is clamped that the welding nozzle ( 2 ; 13 ) at the end of a support arm ( 1 ; 14 ) is attached, that the support arm ( 1 ; 14 ) around the axis ( 21 ) of the welding nozzle ( 2 ; 13 ) is pivotable, that the pivoting of the support arm ( 1 ; 14 ) from a position which is approximately perpendicular to the axis of rotation of the tube ( 3 ; 12 ) is about 180 ° and that the pivoting plane of the support arm ( 1 ; 14 ) approximately perpendicular to the axis of the welding nozzle ( 2 ; 13 ) lies. Device according to claim 1, characterized in that the support arm ( 1 ; 14 ) is arranged substantially horizontally and that on the support arm ( 1 ; 14 ) seated welding nozzle ( 2 ; 13 ) points approximately vertically downwards. Apparatus according to claim 1 or 2, characterized in that the support arm of the welding nozzle ( 13 ) as thigh ( 14 ) of a U-shaped holder ( 15 ) is formed and that the holder ( 15 ) around the axis ( 21 ) of the welding nozzle ( 13 ) is pivotally mounted. Device according to claim 3, characterized in that the lower leg ( 14 ) of the U-shaped bracket ( 15 ) as a support arm of the welding nozzle ( 13 ) is trained. Device according to one of claims 1 to 5, characterized in that the clamping device for clamping at least two mutually parallel tubes ( 3 . 5 ; 11 . 12 ) and that the pipes ( 3 . 5 ; 11 . 12 ) carrying clamping device about the axis of that pipe ( 3 ; 12 ) is rotatable to the straight of the pipe bend ( 4 ; 8th ) should be welded. Method for operating a device according to the claims 1 to 5, characterized in that the welding process fully automatic and continuously over the entire peripheral area of the tube is slightly over 360 ° and that the support arm with the welding nozzle in a position of the pipe is set at which the currently unswelded end of the pipe bend on the side facing away from the working end of the welding nozzle lies. Method according to Claim 6, characterized that the welding process with vertically downwardly directed welding nozzle. Method according to claim 7, characterized in that that the welding process in a position of the pipe starts, at which the currently not to be welded End of the pipe bend over the welding area is that the pipe to be welded to the pipe bend continuously rotates by slightly more than 360 ° until the welding process is completed, and that the support arm about 180 ° about the axis pivoted the welding nozzle after the pipe has turned at least 90 °, but no more than 270 ° Has. Method according to claim 8, characterized in that that the pivoting of the support arm continuously with the tube rotation he follows. Method according to claim 8, characterized in that that the pivoting of the support arm when reaching a certain Angular position of the rotating tube is abrupt.