JP4798864B2 - Welding torch - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a welding torch, and in particular, in a configuration for cooling, a cooling effect can be enhanced by providing a refrigerant supply path and a refrigerant return path that are completely partitioned, thereby improving welding performance. It relates to something that was devised.
[0002]
[Prior art]
The tip of the welding torch is heated to about 900 ° C. during welding. Therefore, the temperature is lowered by cooling it. That is, a cooling water channel is provided in the welding torch, and the welding torch is cooled by supplying and discharging cooling water through the cooling water channel.
[0003]
[Problems to be solved by the invention]
The conventional configuration has the following problems.
That is, the cooling water flow path provided in the conventional welding torch is not completely divided into the cooling water supply path and the cooling water return path, so that the cooling water on the supply side and the cooling water on the return side are separated. There was a problem that the cooling performance deteriorated due to impingement and mixing and the smooth circulation of the cooling water was impaired.
[0004]
An example of this will be described with reference to FIGS. FIG. 9 is a cross-sectional view of the main body portion of the welding torch, and FIG. 10 is a cross-sectional view of the nozzle portion on the tip side. First, as shown in FIG. 9, a partition member 103 is installed in the torch pipe 101 by insertion, and a cooling water supply path 105 and a cooling water return path 107 are formed on the left and right sides of the partition member 103, respectively. Yes.
[0005]
Further, as shown in FIG. 10, a nozzle 109 is attached to the tip side of the torch pipe 101. The nozzle 109 is provided with an annular space 111, and partition members 113 and 115 are also installed in the annular space 111 by being inserted. A cooling water supply path 117 and a cooling water return path 119 are formed on the left and right sides of the partition members 113 and 115. The cooling water supply path 117 communicates with the cooling water supply path 105, and the cooling water return path 119 communicates with the cooling water return path 107.
In addition, the code | symbol 120 in FIG. 10 has shown the chip | tip.
[0006]
As described above, the cooling water supply path side and the cooling water return path side seem to be partitioned at a glance, but the partition member 103 is attached to the torch pipe 101 by insertion, so the partition member 103 and the torch pipe There is a gap 119 between the cooling water supply path 105 and the low-temperature cooling water on the cooling water supply path 105 side and the high-temperature cooling water on the cooling water return path 107 side through the gap 119. Will end up.
[0007]
Similarly, since the partition members 113 and 115 are also attached to the nozzle 109 by insertion, a gap 121 is generated between the partition members 113 and 115 and the nozzle 109, and the gap 121 is interposed therebetween. The low-temperature cooling water on the cooling water supply path 117 side and the high-temperature cooling water on the cooling water return path 119 side collide and coexist.
[0008]
As described above, when the cooling performance is lowered, the welding performance itself is also lowered. For example, when a sufficient cooling effect cannot be obtained, the arc becomes unstable due to thermal influence.
Further, as another problem, in the conventional case, the cooling water supply side and the return side are divided into left and right sides, which also deteriorates the cooling performance.
[0009]
The present invention has been made based on such points, and an object thereof is to provide a welding torch that can improve the cooling performance and improve the welding performance.
[0010]
Welding torch according to claim 1 of the present invention in order to achieve the above object, a welding torch body nozzle on the distal end side is provided, the refrigerant is provided annularly the nozzle toward the front from the rear of the nozzle supply A refrigerant supply path that is annularly provided in a state of being partitioned on the outer peripheral side of the refrigerant supply path, the nozzle being in communication with the refrigerant supply path via the front end, and via the refrigerant supply path a refrigerant return passage for returning towards the rear of the supplied coolant from the front of the using a nozzle, and a coolant supply pipe for supplying a coolant is provided at the rear of the nozzle of the welding torch body to the coolant supply passage, the welding torch is supplied to the coolant supply passage via a plurality of communicating holes provided a refrigerant supplied from the refrigerant supply pipe provided behind the nozzle body in the circumferential direction at equal intervals, returned from the refrigerant return path Via a plurality of communicating holes provided a refrigerant in the circumferential direction equidistantly and is characterized in that anda insulator back to the outer peripheral side of the coolant supply pipe.
The welding torch according to claim 2 is the welding torch according to claim 1, wherein the refrigerant supply path and the refrigerant return path are communicated with each other through a plurality of communicating portions provided at equal intervals in the circumferential direction at the front end. It is characterized by being.
[0011]
That is, in the case of the present invention, by providing the refrigerant supply path and the refrigerant return path in a state of being partitioned in an inner / outer relationship, a state in which the supply-side refrigerant and the return-side refrigerant collide and coexist is established. Accordingly, the refrigerant is prevented from staying and smoothly circulated to improve the cooling efficiency, and as a result, the welding performance is improved.
The welding torch body defined in claim 1 means an existing or presupposed welding torch itself.
In addition, various configurations are conceivable as to how the refrigerant supply path and the refrigerant return path are provided. For example, a refrigerant supply path is provided on the inner peripheral side of the welding torch body, and the outer peripheral side of the refrigerant supply path is provided. It is conceivable that a refrigerant return path is provided in a state where the refrigerant return path is communicated with and partitioned from the refrigerant supply path.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing the overall configuration of the welding torch according to the present embodiment, and FIG. 2 is a view showing the overall configuration of the welding torch according to the present embodiment with a part thereof cut away.
First, there is a torch pipe outer cylinder 1. A torch pipe inner cylinder 3 is internally provided on the inner peripheral side of the torch pipe outer cylinder 1, and an outer skin 5 is covered on the outer peripheral side of the torch pipe outer cylinder 1.
[0013]
A cooling water supply block 7 and a cooling water return block 9 are connected to the right side of the torch pipe outer cylinder 1, the torch pipe inner cylinder 3 and the outer skin 5 in FIGS. 1 and 2. The cooling water supply block 7 includes a cooling water supply pipe 11, and the cooling water return block 9 includes a cooling water return pipe 13. The cooling water supply pipe 11 and the cooling water return pipe 13 are connected to a cooling water supply unit (not shown). The cooling water supply unit includes a cooling water tank and a cooling water pump. 1 and 2, reference numeral 15 denotes a torch end, and a gas supply pipe 17 is connected to the torch end 15. The shield gas is supplied through the gas supply pipe 17.
[0014]
An insulator 19 is covered on the left side of the torch pipe outer cylinder 1, the torch pipe inner cylinder 3, and the outer skin 5 in FIGS. 1 and 2, and a nozzle inner pipe 21 is screwed to the outer peripheral side of the insulator 19.・ It is connected. FIG. 3 is an enlarged view of the front structure including the insulator 19 and the nozzle inner pipe 21. An O-ring 22 is mounted between the torch pipe outer cylinder 1 and the insulator 19, and an O-ring 24 is also mounted between the insulator 19 and the nozzle inner pipe 21.
[0015]
A tip body 23 is disposed on the left side of the inner tube 27 of the torch pipe in FIGS. 1, 2, and 3. An orifice 25 is disposed on the outer peripheral side of the chip body 23, and a chip 28 is connected to the left side of the chip body 23 in FIGS.
In FIG. 3, the orifice 25 and the tip 28 are not shown, and the appearance of the tip body 23 is shown.
[0016]
A nozzle 29 is disposed on the outer peripheral side of the tip body 23, the orifice 25, and the tip 28. The shield gas supplied from the gas supply pipe 17 passes through the inner tube 3 of the torch pipe and enters the chip body 23. From there, it enters between the tip body 23 and the orifice 25 through the hole 23 a provided in the tip body 23, and flows out into the nozzle 29 through the hole 25 a provided in the orifice 25 to the outer peripheral side of the tip 28. It will be ejected, thereby obtaining the desired shield structure.
[0017]
Next, a configuration for supplying and returning cooling water as a refrigerant will be described. First, as shown in FIG. 4, the left and right side surfaces and the upper surface of the torch pipe inner cylinder 3 are cut out flat to form side surfaces 3 a, 3 b and an upper surface 3 c, respectively. A through hole 3d is formed at the center of the inner tube 3 of the torch pipe, and a shield gas and a welding wire (not shown) pass through the through hole 3d.
[0018]
Two cooling water supply pipes 31 are installed in a recessed manner on the left and right side surfaces 3a, 3b of the inner tube 3 of the torch pipe. The cooling water supplied from the already described cooling water supply pipe 11 is supplied forward through these four cooling water supply pipes 31.
[0019]
FIG. 5 is a view showing a state in which the torch end 15 is cut at a predetermined position. The torch end 15 has a left and right side surface and a lower surface cut out flat, and the side surfaces 15a, 15b, and lower surface 15c are respectively cut. It has become. Further, a through hole 15d is formed at the center of the torch end 15, and a shield gas and a welding wire (not shown) pass through the through hole 15d. The four cooling water supply pipes 31 already described have an opening 31a on the cooling water supply block 7 side, and an inner peripheral portion is a flow path 31b.
[0020]
Next, the nozzle 29 has a configuration in which the cooling water supply passage 33 is provided in an annular shape and a cooling water return passage 35 is provided in an annular shape on the outer peripheral side of the cooling water supply passage 33. . That is, the nozzle 29 is arranged with the nozzle inner pipe 21, the intermediate cylinder 32 arranged with a gap on the outer periphery side of the nozzle inner pipe 21, and the gap on the outer circumference side of the intermediate cylinder 32. The outer peripheral cylinder 34 and the nozzle top 30 for fixing each of them are configured. The cooling water supply path 33 is configured between the nozzle inner pipe 21 and the intermediate cylinder 32, and the cooling water return path 35 is configured between the intermediate cylinder 32 and the outer peripheral cylinder 34. Is.
[0021]
The four cooling water supply pipes 31 already described are opened in an annular space 37 provided in the torch pipe inner cylinder 27 as shown in FIG. Therefore, the cooling water supplied from the four cooling water supply pipes 31 enters the annular space 37 and flows into the cooling water supply path 33 from there. That is, the communication holes 19 a are formed at equal intervals in the circumferential direction in the insulator 19 disposed on the outer periphery of the annular space 37. Further, communication holes 21a are also formed in the nozzle inner pipe 21 on the nozzle 29 side at equal intervals in the circumferential direction. The cooling water flowing into the annular space 37 flows into the cooling water supply path 33 through the communication holes 19a and 21a.
[0022]
Further, the cooling water supply path 33 and the cooling water return path 35 communicate with each other via the communication portion 39 on the tip end side of the nozzle 29, so that the cooling water supply path 33 circulated forward in the cooling water supply path 33. The cooling water enters the outer cooling water return path 35 through the communication part 39. As shown in FIG. 6, a plurality of communication portions 39 are formed at equal intervals in the circumferential direction. Further, as shown in FIG. 8, communication holes 21 b are formed at equal intervals in the circumferential direction at the rear end portion of the nozzle inner pipe 21. Further, communication holes 19b are also formed at equal intervals in the circumferential direction on the insulator 19 side. And the cooling water which distribute | circulates the inside of the cooling water return path 35 enters in the outer peripheral space of the said four cooling water piping 31 through the said communicating holes 21b and 19b. There is a cooling water return path 41. Therefore, the cooling water that has entered the cooling water return path 35 enters the cooling water return path 41. And it distribute | circulates back there and enters the cooling water return piping 13 mentioned above.
[0023]
Although it is a communicating part of the cooling water return path 41 and the cooling water return pipe 13, a communication path 9a is formed on the cooling water return block 9 side as shown in FIGS. The cooling water return path 41 and the cooling water return pipe 13 are communicated with each other through the communication path 9a. In addition, the communication portion between the four cooling water supply pipes 31 and the cooling water supply pipe 11 is also formed with a communication path 7a in the cooling water supply block 7, as shown in FIGS. The four cooling water supply pipes 31 and the cooling water supply pipe 11 are communicated with each other through the communication path 7a.
[0024]
As shown in FIG. 3, an O-ring 47 is mounted between the torch pipe inner cylinder 27 and the insulator 19. An O-ring 49 is attached between the insulator 19 and the nozzle 29. Further, an O-ring 51 is mounted between the torch pipe inner cylinder 27 and the insulator 19. Further, an O-ring 53 is mounted between the insulator 19 and the nozzle 29. These O-rings 47, 49, 51, 53 and the already described O-rings 22, 24 partition the cooling water supply path side and the cooling water return path side in a completely liquid-tight state.
[0025]
The operation will be described based on the above configuration.
First, as a basic action of the welding torch, an arc is generated between the welding wire and the workpiece to be welded while being shielded by the shielding gas. The desired welding is performed using the heat generated at that time.
[0026]
Next, the action of the cooling water will be described. The cooling water supplied through the cooling water supply pipe 11 flows into the four cooling water supply pipes 31 from there. The cooling water flowing through the four cooling water supply pipes 31 flows into the cooling water supply path 33 through the annular space 37, the communication hole 19a, and the communication hole 21a. From there, it flows into the cooling water return path 35 through the communication hole 39. The return cooling water that has entered the cooling water return path 35 enters the cooling water return path 41 from there through the communication hole 21b and the communication hole 19b, flows therethrough, enters the cooling water return pipe 13, and returns. It will be.
[0027]
As described above, according to this embodiment, the following effects can be obtained.
First, regarding the supply and discharge of the cooling water, the supply path and the return path are completely partitioned throughout, so that the cooling water on the supply side and the cooling water on the return side do not collide with each other. Therefore, the circulation of the cooling water can be made smooth to prevent stagnation, and thereby the cooling effect can be improved. Since the thermal effect is mitigated by the increased cooling effect, the arc can be stabilized and the welding performance can be improved.
In addition, the cooling water supply path and the cooling water return path are not divided on the left and right as in the prior art, but are annularly divided on the inner side and the outer side, so that the cooling performance can also be improved. .
In addition, since the cooling effect is improved, heat generation can be effectively absorbed, thereby allowing a larger current to flow. As a result, a thicker base material can be welded.
Further, if the thickness of the base material is the same, welding can be performed continuously for a longer time at the same current value.
In addition, the temperature of the nozzle 29 is lowered due to the improvement of the cooling effect, thereby suppressing the expansion of the shield gas, resulting in a stable flow, so that the generated arc can be reduced, and as a result, the quality of welding is improved. be able to.
Further, since the temperature difference between the nozzle 29 and the spatter becomes larger, it is possible to suppress spatter adhesion.
Further, since the rise in the temperature of the tip 28 can be suppressed, the softening of the tip 28 can be suppressed, whereby the wear can be suppressed and the life can be extended, and the power feeding performance is improved and stabilized. .
[0028]
The present invention is not limited to the one embodiment.
First, the basic configuration of the welding torch is not particularly limited as long as the coolant supply path and the coolant return path can be divided and provided.
Various configurations can be considered for the configuration in which the coolant supply path and the coolant return path are partitioned, and the configuration is not particularly limited.
Moreover, in the case of the said one embodiment, although the cooling water was mentioned as an example and demonstrated as a refrigerant | coolant, another refrigerant | coolant may be sufficient.
[0029]
【The invention's effect】
As described in detail above, according to the welding torch according to the present invention, the supply path and the return path are completely partitioned with respect to the supply / discharge of the cooling water through the entire inner / outer relationship. And the cooling water on the return side do not collide or mix. Therefore, the circulation of the cooling water can be made smooth to prevent stagnation, and thereby the cooling effect can be improved. Since the thermal effect is alleviated due to the increased cooling effect, the welding performance can be improved and the welding quality can be improved, for example, the arc can be stabilized and the welding performance can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a welding torch according to an embodiment of the present invention.
FIG. 2 is a diagram showing an embodiment of the present invention and is a diagram in which a configuration of a welding torch is partially cut away.
FIG. 3 is a diagram showing an embodiment of the present invention, and is a cross-sectional view showing a configuration of a tip portion of a welding torch.
4 is a diagram showing an embodiment of the present invention, and is a cross-sectional view taken along the line IV-IV in FIG.
FIG. 5 is a diagram showing an embodiment of the present invention, and is a cross-sectional view taken along line VV of FIG.
6 is a view showing an embodiment of the present invention, and is a cross-sectional view taken along the line VI-VI in FIG.
7 is a view showing an embodiment of the present invention, and is a cross-sectional view taken along the line VII-VII in FIG.
8 is a diagram showing an embodiment of the present invention, and is a cross-sectional view taken along line VIII-VIII in FIG.
FIG. 9 is a diagram showing a conventional example, and is a cross-sectional view of a cooling water supply / return path in a welding torch.
FIG. 10 is a diagram showing a conventional example, and is a cross-sectional view of a cooling water supply / return path in a welding torch.
[Explanation of symbols]
1 Torch pipe outer cylinder 3 Torch pipe inner cylinder 5 Outer shell 11 Cooling water supply pipe (part of the refrigerant supply path)
13 Cooling water return pipe (part of refrigerant return path)
19 Insulator 21 Nozzle inner pipe 23 Tip body 25 Orifice 27 Torch pipe inner cylinder 28 Tip 29 Nozzle 31 Cooling water supply pipe (part of refrigerant supply path)
33 Cooling water supply path (part of refrigerant supply path)
35 Coolant return path (part of refrigerant return path)
41 Coolant return path (part of refrigerant return path)

Claims (2)

A welding torch body provided with a nozzle on the tip side ;
A refrigerant supply path for supplying forward coolant provided annularly from the rear of the nozzle to the nozzle,
The nozzle is provided in an annular shape in a state of being partitioned on the outer peripheral side of the refrigerant supply path, communicates with the refrigerant supply path via the front end, and supplies the refrigerant supplied via the refrigerant supply path. A refrigerant return path for returning from the front to the rear of the nozzle ;
A refrigerant supply pipe that is provided behind the nozzle of the welding torch body and supplies a refrigerant to the refrigerant supply path;
A refrigerant provided behind the nozzle of the welding torch main body and supplied from the refrigerant supply pipe is supplied to the refrigerant supply path through a plurality of communication holes provided at equal intervals in the circumferential direction, and from the refrigerant return path. An insulator for returning the returned refrigerant to the outer peripheral side of the refrigerant supply pipe through a plurality of communication holes provided at equal intervals in the circumferential direction;
A welding torch characterized by comprising: The welding torch according to claim 1,
The welding torch characterized in that the refrigerant supply path and the refrigerant return path are communicated via a plurality of communicating portions provided at equal intervals in the circumferential direction at the front end.

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