JP3840740B2 - Finned pipe manufacturing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a finned pipe manufacturing apparatus.
[0002]
[Prior art]
In general, the furnace wall of a boiler is formed by arranging a large number of finned pipes 3 welded with flat bars 2 as fins at both ends in the radial direction of the pipe 1 as shown in FIG. The finned tube 3 is conventionally provided with flat bars 2 at both ends in the radial direction of the tube 1, dummy tubes 4 are disposed at the ends of the flat bars 2, and the dummy tubes 4 are U-shaped. Flux 6 is supplied onto the flat bar 2 from a flux supply nozzle (not shown) in a state in which the gap between the flat bar 2 and the tube 1 is eliminated by pressing against the end of the flat bar 2 with a grooved side roller 5. However, it was manufactured by submerged arc welding of the flat bar 2 to the pipe 1 with a welding torch (not shown).
[0003]
However, as described above, in the state where the dummy tube 4 is disposed at the end of the flat bar 2 and the flat bar 2 is welded to both ends in the radial direction of the tube 1 as fins, the finned tube 3 as a product is used. Has a disadvantage that the dummy pipe 4 which is not required at all is required, and the dummy pipe 4 is assembled and removed from the finned pipe manufacturing apparatus, which is inefficient.
[0004]
For this reason, conventionally, as shown in FIGS. 5 and 6, a tube pressing roller 7 having a U-shaped groove that substantially matches the outer peripheral surface of the tube 1 and supporting the tube 1 so as to sandwich the tube 1 from above and below is provided. A plurality of sets (four sets in the example of FIGS. 5 and 6) are arranged at a required interval in the conveying direction of the tube 1 and a side roller 8 with a groove that holds the end of the flat bar 2 is conveyed to the tube 1. And a fin presser roller 9 that supports the flat bar 2 so as to sandwich the flat bar 2 from above and below at a required position downstream of the side roller 8 in the conveying direction. There is a finned pipe manufacturing apparatus in which a welding torch 10 and a flux supply nozzle 11 are disposed at a required position downstream of the roller 9 in the conveying direction of the pipe 1 so that the dummy pipe 4 is not used.
[0005]
In the case of the conventional finned pipe manufacturing apparatus shown in FIGS. 5 and 6, the pipe 1 is sandwiched from above and below by the pipe presser roller 7, and the end of the flat bar 2 is pressed by the side roller 8. 9, the pipe 1 and the flat bar 2 are moved in the conveying direction while the flat bar 2 is sandwiched from above and below, and the flux 6 is supplied from the flux supply nozzle 11 onto the flat bar 2, while the welding torch 10 On the other hand, the flat bar 2 is subjected to submerged arc welding.
[0006]
[Problems to be solved by the invention]
However, in the conventional finned pipe manufacturing apparatus as shown in FIGS. 5 and 6, the movement of the flat bar 2 is restricted only by the side roller 8 and the fin presser roller 9. As indicated by the phantom line, the flat bar 2 may be opened, or the flat bar 2 may be welded to the tube 1 in a twisted state as shown in FIG. Tube 3 could not be manufactured.
[0007]
Further, since there is no dummy tube 4, the flux supplied from the flux supply nozzle 11 onto the flat bar 2 tends to fall, and there is a possibility that stable welding cannot be performed.
[0008]
In view of such circumstances, the present invention can prevent the flat bar from opening and twisting due to welding heat without using a dummy tube, and can prevent the flux supplied from the flux supply nozzle from dropping onto the flat bar. An object of the present invention is to provide a finned tube manufacturing apparatus capable of stabilizing a weld and manufacturing an accurate finned tube.
[0009]
[Means for Solving the Problems]
The present invention is a finned pipe manufacturing apparatus for welding a flat bar as a fin to both ends in the radial direction of the pipe while conveying the pipe and the flat bar in the longitudinal direction,
A tube pressing roller that is disposed at a required position in the conveying direction of the tube and supports the tube so as to be sandwiched from above and below;
A side roller disposed at a required position in the conveying direction of the tube and pressing the end of the flat bar;
A fin presser roller disposed at a required position downstream of the side roller in the conveying direction of the pipe and supporting the flat bar so as to be sandwiched from above and below;
A welding torch which is disposed at a required position downstream of the fin presser roller in the conveying direction of the pipe and welds a flat bar to the pipe;
A flux supply nozzle disposed in the vicinity of the welding torch and supplying flux onto the flat bar;
A fin holding jig disposed near the welding torch and the flux supply nozzle and holding the end of the flat bar and receiving the flux supplied from the flux supply nozzle onto the flat bar;
A finned tube manufacturing comprising a fin twist prevention presser roller disposed at a required position downstream of the fin presser jig in the transport direction of the tube and supporting the flat bar so as to be sandwiched from above and below. It depends on the device.
[0010]
According to the above means, the following operation can be obtained.
[0011]
The tube is clamped from the top and bottom by the tube pressing roller, and the end of the flat bar is pressed by the side roller. The flat bar is clamped from the top and bottom by the fin pressing roller, and the end of the flat bar by the fin pressing jig While the flat bar is clamped from above and below by the fin twist prevention press roller, the pipe and the flat bar are moved in the conveying direction, and the flux is supplied from the flux supply nozzle to the flat bar while welding torch. When the flat bar is welded to the tube by the welding, the flat bar is shaped not only by the side roller and fin presser roller but also by the fin presser jig and the fin twist prevention presser roller. Causes the flat bar to open or the tube to become flat. While the bar is not welded in a twisted state, the flux supplied from the flux supply nozzle onto the flat bar is held on the flat bar without falling by the fin holding jig, so stable welding is possible. As a result, a finned tube with high accuracy is manufactured.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
1 to 3 show an example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 5 and 6 denote the same components, and the basic configuration is shown in FIGS. Although the same as the conventional one shown in FIG. 6, the feature of this example is that the end of the flat bar 2 is located near the welding torch 10 and the flux supply nozzle 11 as shown in FIGS. 1 to 3. A fin presser jig 12 for receiving the flux 6 supplied from the flux supply nozzle 11 onto the flat bar 2 is provided, and at a required position downstream of the fin presser jig 12 in the conveying direction of the tube 1. The presser roller 9 'for preventing twisting of the fin that supports the flat bar 2 so as to sandwich the flat bar 2 from above and below is provided.
[0014]
The fin pressing jig 12 can appropriately adjust the rolling force on the flat bar 2 by operating a cylinder (not shown) or the like.
[0015]
Next, the operation of the illustrated example will be described.
[0016]
The tube 1 is sandwiched from above and below by the tube pressing roller 7 and the end of the flat bar 2 is pressed by the side roller 8, and the flat bar 2 is sandwiched from above and below by the fin pressing roller 9. 12, the end of the flat bar 2 is pressed and the flat bar 2 is sandwiched from above and below by the fin twist prevention pressing roller 9 ′. When the flat bar 2 is submerged arc welded to the pipe 1 by the welding torch 10 while supplying the flux 6 from 11 to the flat bar 2, not only the side roller 8 and the fin presser roller 9 but also the fin presser The movement is also restricted by the tool 12 and the presser roller 9 'for preventing the twisting of the fin. The flat bar 2 is not opened due to welding heat or welded in a state where the flat bar 2 is twisted with respect to the tube 1, while being supplied from the flux supply nozzle 11 onto the flat bar 2. Since the flux 6 is held on the flat bar 2 without falling by the fin pressing jig 12, stable welding is performed, and the finned tube 3 with high accuracy is manufactured.
[0017]
Thus, the opening and twisting of the flat bar 2 due to welding heat can be prevented without using the dummy tube 4, and the flux 6 supplied onto the flat bar 2 from the flux supply nozzle 11 can be prevented from falling, so that welding can be performed. The finned tube 3 can be manufactured with stability and accuracy.
[0018]
In addition, the finned pipe manufacturing apparatus of the present invention is not limited to the illustrated example described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.
[0019]
【The invention's effect】
As described above, according to the finned pipe manufacturing apparatus of the present invention, the opening and twisting of the flat bar due to welding heat can be prevented without using a dummy pipe, and the flat bar is supplied from the flux supply nozzle onto the flat bar. The flux can be prevented from dropping, and the excellent effect that the welding can be stabilized and the finned tube with high accuracy can be produced.
[Brief description of the drawings]
FIG. 1 is a side view of an example of an embodiment for carrying out the present invention.
FIG. 2 is a plan view of an example for carrying out the present invention.
3 is a cross-sectional view taken along the line III-III in FIG.
FIG. 4 is a cross-sectional view showing an example of a finned tube manufacturing apparatus using a conventional dummy tube.
FIG. 5 is a side view showing an example of a finned tube manufacturing apparatus that does not use a conventional dummy tube.
FIG. 6 is a plan view illustrating an example of a finned tube manufacturing apparatus that does not use a conventional dummy tube.
FIG. 7 is a cross-sectional view showing a twist of a fin that occurs in an example of a finned tube manufacturing apparatus that does not use a conventional dummy tube.
[Explanation of symbols]
1 Tube 2 Flat bar 3 Finned tube 6 Flux 7 Tube presser roller 8 Side roller 9 Fin presser roller 9 ′ Fin torsion-preventing presser roller 10 Welding torch 11 Flux supply nozzle 12 Fin presser jig

Claims (1)

A finned pipe manufacturing apparatus for welding a flat bar as a fin to both ends in the radial direction of the pipe while conveying the pipe and the flat bar in the longitudinal direction,
A tube pressing roller that is disposed at a required position in the conveying direction of the tube and supports the tube so as to be sandwiched from above and below;
A side roller disposed at a required position in the conveying direction of the tube and pressing the end of the flat bar;
A fin presser roller disposed at a required position downstream of the side roller in the conveying direction of the pipe and supporting the flat bar so as to be sandwiched from above and below;
A welding torch which is disposed at a required position downstream of the fin presser roller in the conveying direction of the pipe and welds a flat bar to the pipe;
A flux supply nozzle disposed in the vicinity of the welding torch and supplying flux onto the flat bar;
A fin holding jig disposed near the welding torch and the flux supply nozzle and holding the end of the flat bar and receiving the flux supplied from the flux supply nozzle onto the flat bar;
A finned tube manufacturing comprising a fin twist prevention presser roller disposed at a required position downstream of the fin presser jig in the transport direction of the tube and supporting the flat bar so as to be sandwiched from above and below. apparatus.

Images