Fume suction welding torch

Abstract

To provide a fume suction type welding torch capable of efficiently sucking and discharging fume generated from a weld zone.SOLUTION: In a fume suction type welding torch including a welding torch body, and a fume suction mechanism provided on the outer periphery of the welding torch body, the fume suction mechanism includes a fume suction hood on the tip, and the tip of the fume suction hood is expanded like a flare, and an inner wall of the expanded part is formed with smooth R.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fume suction welding torch, and in particular to one that is designed to improve fume suction performance by devising the shape of the suction port of the fume suction hood attached to the tip. [Background technology]

[0002] The configuration of this type of fume suction type welding torch is disclosed in, for example, Patent Document 1 and Patent Document 2.

[0003] First, in the case of the fume suction welding torch described in Patent Document 1, a chamber adapter is provided for suctioning fumes. The tip of this chamber adapter is closed and multiple suction ports are provided on the side. The fumes are sucked in through these suction ports.

[0004] Next, in the case of a welding torch with a fume suction hood described in Patent Document 2, a configuration is disclosed in which the fume suction hood is provided in a straight tube shape and fumes are sucked in through its tip opening. It also discloses a configuration in which the tip of the fume suction hood is expanded in diameter into a funnel shape and the tip of the shielding gas discharge nozzle inside it is also expanded in diameter. Furthermore, a configuration equivalent to the configuration described in Patent Document 1 is also disclosed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 53-48118 [Patent Document 2] Japanese Utility Model Application Publication No. 49-136823 Summary of the Invention [Problem to be solved by the invention]

[0006] The above conventional configuration has the following problems. Neither of the configurations described in Patent Document 1 nor Patent Document 2 can be said to have high fume suction performance, and therefore, in order to efficiently suck in fumes, the suction port is placed close to the welding area. However, if the distance is too close, the shielding gas shielding the welding area will be sucked in, causing a problem of disrupting the flow of shielding gas and resulting in welding defects.

[0007] The present invention has been made based on the above points, and an object of the present invention is to provide a fume suction type welding torch that can improve fume suction performance. [Means for solving the problem]

[0008] In order to solve the above problems, a fume suction type welding torch according to claim 1 of the present invention comprises a welding torch body and a fume suction mechanism installed on the outer periphery of the welding torch body, wherein the welding torch body has a contact tip at its tip and a shield nozzle on the outer periphery of the contact tip, the fume suction mechanism has a sleeve and a fume suction hood at the tip of the sleeve, the suction port at the tip of the fume suction hood is expanded in diameter in a flared shape, the inner wall of the expanded part is formed with a smooth R, there is no part on the tip side of the fume suction hood that protrudes on the outer periphery of the shield nozzle, shield gas is sprayed onto the welding area through between the contact tip and the shield nozzle, fumes generated at the welding area are sucked into the fume suction hood via the suction port, and the flared suction port allows the fumes generated at the welding area to be sucked into the fume suction hood from the periphery of the fume suction hood. Hume The airflow that goes around the inside of the suction hood is prioritized, and the airflow from the welding part to the Hume This is characterized by restricting the linear airflow toward the suction hood. Furthermore, the fume suction welding torch according to claim 2 is characterized in that, in the fume suction welding torch according to claim 1, the angle θ of the expansion is 20° to 30°, and the radius R of the inner wall of the expanding portion is in the range of R8mm to R30mm. Furthermore, the fume suction type welding torch according to claim 3 is a fume suction type welding torch according to claim 1 or claim 2, characterized in that the axial position of the fume suction hood relative to the shield nozzle is adjustable. Furthermore, the fume suction type welding torch according to claim 4 is a fume suction type welding torch according to any one of claims 1 to 3, characterized in that the fume suction mechanism has an end member at the base end, and the end member and the welding torch body are sealed by a sealing member. [Effects of the Invention]

[0009] As described above, the fume suction welding torch according to claim 1 of the present invention comprises a welding torch body and a fume suction mechanism installed on the outer periphery of the welding torch body, and the fume suction mechanism is equipped with a fume suction hood at its tip, and the tip of the fume suction hood is flared to expand in diameter, with the inner wall of the expanding part formed with a smooth R, thereby improving fume suction performance. This allows the suction port of the fume suction hood to be located as far away as possible from the welding area, preventing welding defects caused by the suction of shielding gas. Furthermore, according to the fume suction welding torch of claim 2, in the fume suction welding torch of claim 1, the angle θ of the expansion is 20° to 30°, and the radius R of the inner wall of the expanding portion is in the range of R8 mm to R30 mm, so the above effect can be ensured. Furthermore, according to the fume suction type welding torch of claim 3, in the fume suction type welding torch of claim 1 or claim 2, the welding torch body is provided with a shield nozzle at the tip, and the axial position of the fume suction hood relative to the shield nozzle is adjustable, so that the fume suction hood can be attached at an optimal position relative to the shield nozzle in order to improve fume suction performance. Furthermore, according to the fume suction type welding torch of claim 4, in the fume suction type welding torch of any one of claims 1 to 3, the fume suction mechanism is provided with an end member at the base end, and the end member and the welding torch body are sealed by a sealing member, which also improves fume suction performance. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing the configuration of a fume suction welding torch according to an embodiment of the present invention. [Figure 2] 2(a) is a side view of a fume suction hood, FIG. 2(b) is a cross-sectional view taken along line bb in FIG. 2(a), and FIG. 2(c) is a cross-sectional view taken along line cc in FIG. 2(a). [Figure 3] 3(a) and 3(b) are side views of a sleeve, a cross-sectional view taken along line bb in FIG. 3(a), and a view taken along line cc in FIG. 3(b). [Figure 4] 4A and 4B are diagrams for explaining the effects of an embodiment of the present invention, with FIG. 4A showing the suction effect in the embodiment and FIG. 4B showing the suction effect in the comparative example. [Figure 5] 10 is a photograph showing the suction action in the case of the embodiment, illustrating the effect of the embodiment of the present invention. FIG. [Figure 6] FIG. 10 is a photograph showing a comparative example and illustrating the suction effect. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention will be described below with reference to Figures 1 to 6. Figure 1 is a cross-sectional view of a fume suction welding torch according to this embodiment. First, there is a welding torch body 1, which contains a torch pipe 3. The outer periphery of this torch pipe 3 is covered with a heat-shrinkable insulating tube 5. A gripping portion (not shown) is threadedly connected to the right side of the torch pipe 3 in Figure 1, and a connecting fitting (not shown) is threadedly joined to the right side of the gripping portion in the figure. Another connecting fitting (not shown) is joined to the gripping portion, and a shielding gas supply hose (not shown) is connected to the connecting fitting.

[0012] A tip body 7 is threadedly joined to the tip side of the torch pipe 3. An insulator 9 made of an insulating material is threadedly joined to the outer periphery of the tip body 7. A contact tip 11 is threadedly joined to the tip side of the tip body 7. A ceramic orifice 13 is installed on the outer periphery of the joint between the tip body 7 and contact tip 11. A shield nozzle 15 is installed on the outer periphery of the tip body 7 and contact tip 11. The shield nozzle 15 is joined to the insulator 9 via a sleeve 17.

[0013] A tube 21 is installed inside the torch pipe 3 and the tip body 7, and a welding wire (not shown) is inserted into this tube 21. The tip of this welding wire is disposed so as to protrude a predetermined amount from the tip of the contact tip 11.

[0014] A plurality of shielding gas outlets 7a are bored at the tip of the tip body 7. A plurality of shielding gas outlets 13a are also bored in the orifice 13. Shielding gas is supplied between the torch pipe 3 and the tube 21, passes between the tip body 7 and the tube 21, and flows out between the orifice 13 and the shield nozzle 15 via the shielding gas outlets 7a and 13a. From there, the gas passes through the outer periphery of the contact tip 11 and is sprayed onto the welding site.

[0015] A fume suction mechanism 31 is installed on the outer periphery of the torch body 1. First, there is a sleeve 33, and a flexible pipe 35 is joined to the right side of this sleeve 33 in FIG. 1. A branch pipe 37 is joined to the right side of the flexible pipe 35 in FIG. 1. An end member 39 is joined to the right side of the branch pipe 37 in FIG. 1. A fume suction hood 41 is installed on the outer periphery of the sleeve 33. A fume suction hose (not shown) is connected to the branch pipe 37, and the fume suction hose is connected to a dust collector (not shown).

[0016] As shown in Fig. 2, the fume suction hood 41 has a notch 51 formed therein, and five fixing screw through-holes 51a are formed in this notch 51. On the other hand, as shown in Fig. 3, three through-holes 53, 53, 53 are drilled on the sleeve 33 side. The positions of the fixing screw through-holes 51a and the through-holes 53 are adjusted as appropriate, and fixing screws (not shown) are screwed in. Thereby, the axial position of the fume suction hood 41 relative to the shield nozzle 15 can be adjusted and fixed at any position.

[0017] The suction port 61 at the tip of the fume suction hood 41 is flared with a smooth radius. The angle θ of the flare is set arbitrarily, for example, within the range of 20° to 30°. The radius R of the inner wall of the expanding portion of the flare is set arbitrarily within the range of R8 mm to R30 mm. The edge of the suction port 61 is rounded. By providing this flared suction port 61, a vortex flow is generated during suction, enhancing suction performance from the outer periphery and suppressing suction from the front. This allows the suction port 61 to be located as far away from the welding area as possible, thereby suppressing suction of shielding gas.

[0018] A seal member 71 is installed between the branch pipe 37 and the end member 39. A seal member 73 is also installed between the end member 39 and the torch pipe 3.

[0019] Based on the above configuration, the operation thereof will be explained. First, regarding the flow of shielding gas, it is supplied between the torch pipe 3 and the tube 21, passes between the tip body 7 and the tube 21, and flows out through the shielding gas outlets 7a and 13a to between the orifice 13 and the shield nozzle 15. From there, it passes through the outer periphery of the contact tip 11 and is sprayed onto the welding site.

[0020] With the welding area shielded by the shielding gas, a predetermined welding is performed while generating an arc between the welding wire and the workpiece (not shown).

[0021] Fumes generated at the welding site are sucked into the fume suction hood 41 through the suction port 61 of the fume suction hood 41, from where they are sucked through the sleeve 33, flexible pipe 35, and branch pipe 37, and further sucked into the dust collector through the suction hose.

[0022] As described above, the present embodiment can provide the following effects. First, the fume suction performance can be improved by forming the suction port 61 of the fume suction hood 41 into a flared shape with a smooth R, which generates a vortex-like suction flow near the suction port 61, making it possible to guide the flow from the outer periphery. By improving the fume suction performance, the suction port 61 of the fume suction hood 41 can be located as far away as possible from the welding area, thereby eliminating the suction of shielding gas and preventing the occurrence of welding defects. By forming the suction port 61 of the fume suction hood 41 in a flared shape with a smooth R and making the inner wall R-shaped, the suction air flow is generated in a vortex along the wall surface, so the influence of suction toward the front can be suppressed and suction from the outer peripheral side can be made the main focus, which also makes it possible to eliminate suction of shielding gas. Moreover, by adjusting the axial position of the fume suction hood 41 relative to the sleeve 33, the axial position of the fume suction hood 41 relative to the shield nozzle 15 can be adjusted to an optimum position. Furthermore, the sealing members 71 and 73 are used for sealing, which also improves the fume suction performance.

[0023] Here, the difference in fume suction action between the fume suction hood 41 of this embodiment and the fume suction hood 141 of the comparative example will be explained with reference to Fig. 4. As already explained, the fume suction hood 41 of this embodiment has a flared diameter at the tip, and the inner wall of the suction port 61 at the flared portion is formed with a smooth R. In contrast, the fume suction hood 141 of the comparative example has a linear tapered diameter at the tip, and the inner wall of the suction port 161 at the tip is formed linearly.

[0024] Figure 4(a) shows the case of this embodiment, where the airflow generated along the inner wall of the tip wraps around and effectively sucks in and collects the fumes that have escaped to the outer periphery. Also, since the airflow wraps around, it has little effect on the front, so the shielding gas is not sucked in. Figure 4(b) shows the comparative example, where a linear airflow is generated along the inner wall of the tip, which sucks in and captures the fumes in front of it, as well as the shielding gas. Also, the fumes that escape to the outer periphery are not effectively sucked in and captured.

[0025] Next, the difference in fume suction action between the fume suction hood 41 of this embodiment and the fume suction hood 241 of the comparative example will be described with reference to actual photographs of FIGS. The photograph in Figure 5 shows the case of this embodiment, and it can be seen that the airflow generated along the inner wall of the tip wraps around and effectively sucks in and collects the fumes that have escaped to the outer periphery. The photograph in Figure 6 shows the comparative example, in which a straight fume suction hood 241 is used, and it can be seen that a linear airflow is generated along the inner wall of the tip, which not only sucks in and collects the fumes in front of it, but also sucks in the shielding gas.

[0026] The present invention is not limited to the above embodiment. First, the flare shape at the tip of the fume suction hood and the R shape of the inner wall are not limited to those shown in the drawings, and various shapes are possible. The configuration for adjusting the position of the fume suction hood relative to the sleeve is not limited to the one shown in the drawings, and various configurations are possible. The configuration of the welding torch body is merely an example. The configuration of the fume suction mechanism is also merely an example. [Industrial Applicability]

[0027] The present invention relates to a fume suction type welding torch, and in particular to one that has been designed to improve fume suction performance by devising the shape of the fume suction hood attached to the tip, and is suitable for welding torches used at welding sites where large amounts of fumes are generated, for example. [Explanation of symbols]

[0028] 1 Welding torch body 15 Shield Nozzle 31 Fume suction mechanism 33 Sleeve 35 Flexible hose 37 Branch Pipe 39 End member 41 Fume suction hood 51 Notch 51a Fixing screw through hole 53 Through hole 61 Suction port 71 Sealing material 73 Sealing material

Claims

1. A fume suction type welding torch comprising a welding torch body and a fume suction mechanism installed on the outer periphery of the welding torch body, the welding torch body is provided with a contact tip at its tip and a shield nozzle on the outer periphery of the contact tip; The fume suction mechanism includes a sleeve and a fume suction hood at the tip of the sleeve, The suction port at the tip of the fume suction hood is flared, and the inner wall of the flared portion is formed with a smooth R. There is no part on the tip side of the fume suction hood that protrudes on the outer periphery side of the shield nozzle, A shielding gas is injected onto the welding site through a gap between the contact tip and the shielding nozzle, The fumes generated at the welding site are sucked into the fume suction hood through the suction port. A fume suction type welding torch characterized in that the flared suction port prioritizes the airflow that flows around the periphery of the fume suction hood into the fume suction hood and restricts the linear airflow from the welding area toward the fume suction hood.

2. 2. The fume suction type welding torch according to claim 1, A fume suction welding torch characterized in that the angle θ of the expansion is 20° to 30°, and the radius R of the inner wall of the expanding portion is in the range of R8 mm to R30 mm.

3. The fume suction type welding torch according to claim 1 or 2, A fume suction welding torch characterized in that the axial position of the fume suction hood relative to the shield nozzle is adjustable.

4. In the fume suction type welding torch according to any one of claims 1 to 3, The fume suction mechanism has an end member at its base end, A fume suction type welding torch, characterized in that the end member and the welding torch body are sealed with a sealing member.

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