JPH0648969U - Fume suction torch - Google Patents

Abstract

(57) [Abstract] [Purpose] A shield nozzle that fits an energizing tip and discharges a shield gas from its tip, and an atmosphere gas is introduced through a suction hole provided at the tip of the shield nozzle A fume suction torch having a suction nozzle for sucking is provided, which prevents disturbance of the shield gas flow, reduces the shielding effect due to this disturbance, and provides high fume removal efficiency. [Configuration] The difference between the outer diameter of the shield nozzle 9 and the inner diameter of the tip of the suction nozzle 8 is 0.3 mm or less.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fume suction torch that sucks and removes harmful welding fumes with high efficiency in gas shielded arc welding.

[0002]

[Prior art]

 FIG. 7 shows a conventional gas shielded arc welding device, and FIG. 8 shows the fume suction torch. The fume suction torch 1 grips a torch grip 3 so that its front end is directed to the welded portion 2. The torch 1 is arranged such that a shield nozzle 9 is inserted through an inside of a suction nozzle 8 fixed to a nozzle pedestal 10 by frictional engagement. In addition, an energizing tip (not shown in FIGS. 7 and 8) is coaxially arranged in the shield nozzle 9. The torch 1 and the torch grip 3 are connected by the torch body 12 and the suction pipe 11 which have high rigidity. The wiring in the power cable 5 is connected to the current-carrying tip of the torch 1, is inserted into the torch body 12 from the current-carrying tip, is led out to the torch grip 3, and is further connected to the wire feeder 6. A power cable 5 is connected to the shield nozzle 9, and a shield gas is externally supplied to the shield nozzle 9 through the power cable 5 and is discharged from the shield nozzle 9 toward a welded portion. There is.

Further, the suction nozzle 8 is provided with a plurality of suction holes 13, and the atmosphere gas containing the welding fumes sucked from the suction holes 13 is a gap between the suction nozzle 8 and the shield nozzle 9 inside thereof. To the fume collector 7 via the suction pipe 11 and the suction hose 4 connected to the suction pipe 11. The suction hose 4 and the power cable 5 are made of a flexible material, and are bound by a flexible hose 14 between the suction torch 3 and the wire feeding device 6 and the fume collector 7. Therefore, when the operator grips the torch grip 3 and causes the tip of the torch 1 to move along the welding portion 2, the hose 14 flexibly deforms and follows the movement of the torch 1.

FIG. 9 is a sectional view showing the structure of the tip of this conventional fume suction torch. As shown in FIG. 9, a shield nozzle 9 is provided in the suction nozzle 8 coaxially therewith, and an energizing tip 14 is disposed at the axial center position of the shield nozzle 9. The tip of the suction nozzle 8 is reduced in diameter and faces the vicinity of the outer peripheral surface of the shield nozzle 9. A plurality of suction holes 13 are provided in the suction nozzle 8 of the reduced diameter portion. In this case, the inner diameter of the tip of the suction nozzle 8 is b, the outer diameter of the outer peripheral surface of the shield nozzle 9 is a, and the length of the shield nozzle 9 protruding from the suction nozzle 8 is d. The shield gas flows through the inside of the shield nozzle 9 and is discharged from the tip of the shield nozzle 9 to seal the periphery of an arc formed between the current-carrying tip 14 and the object to be welded from the outside air. On the other hand, since the space between the suction nozzle 8 and the seal nozzle 9 is sucked, the outside air at the tip of the torch is sucked into the space together with the fumes through the suction hole 13.

[0005]

[Problems to be solved by the device]

 However, if the projection length d of the shield nozzle 9 is too short, as shown in FIG. 10, the shield gas is sucked into the suction nozzle through a gap created by the difference between the outer diameter of the shield nozzle and the inner diameter of the suction nozzle. , Shield gas flow is disturbed. As a result, the shield effect against the arc is reduced.

On the other hand, as shown in FIG. 11, if the projection length d of the shield nozzle 9 is too long, the suction hole 13 moves away from the fume generation source, and the efficiency of fume suction is reduced.

The present invention has been made in view of the above problems, and prevents turbulence of the shield gas flow, reduces the shielding effect due to the turbulence of the shield gas flow, and removes fume. The purpose is to provide a highly efficient fume suction torch.

[0008]

[Means for Solving the Problems]

 A first fume suction torch according to the present invention includes a shield nozzle for fitting a current-carrying tip and discharging a shield gas from its tip, and a suction hole provided at the tip of the shield nozzle for fitting the shield nozzle. In a fume suction torch having a suction nozzle for sucking an atmosphere gas containing welding fume, the difference between the outer diameter of the shield nozzle and the inner diameter of the tip of the suction nozzle is 0.3 mm or less.

A second fume suction torch according to the present invention is provided with a convex portion on the outer surface of the tip end portion of the shield nozzle, and adjusts the longitudinal position between the shield nozzle and the suction nozzle. And the tip of the suction nozzle is placed in contact with the convex portion.

The third fume suction torch according to the present invention is characterized in that a shield material is arranged between the shield gas and the tip of the suction nozzle.

Further, a fourth fume suction torch according to the present invention is characterized by having a structure in which a tip portion of the shield nozzle and a tip portion of the suction nozzle are engaged with each other.

[0012]

[Action]

 The inventors of the present invention repeated various experimental studies to investigate the cause of the disturbance of the shield gas flow when the protrusion length d is short. As a result, the conventional fume suction torch has a problem of working accuracy, and therefore, the inner diameter b of the tip of the suction nozzle 8 is small. And an outer diameter a of the shield nozzle 9 are provided to some extent. Therefore, a gap is created between the tip of the suction nozzle 8 and the shield nozzle 9, which causes the discharge from the shield nozzle 9. It was found that the fact that the shielded gas that is generated is sucked through this gap is the cause of the disturbance in the shield gas flow.

Therefore, the inventors of the present invention have found that the effect of the gap between the shield nozzle and the suction nozzle on the shield gas flow should be eliminated in order to prevent the shield failure. Has been completed.

In FIG. 1, the horizontal axis represents the protrusion length d of the shield nozzle, and the vertical axis represents the difference b-a between the suction nozzle tip inner diameter b and the shield nozzle outer diameter a. The conditions are represented by hatching in the figure. Further, FIG. 2 shows the relationship between the fume recovery rate and the projection length d by plotting the projection length d on the horizontal axis and the fume recovery rate on the vertical axis. As is apparent from FIG. 2, when the protrusion length d exceeds 10 mm and becomes long, the fume recovery rate remarkably decreases. Therefore, the protrusion length d is set to 10 mm or less, preferably 6 mm or less. In this case, as is apparent from FIG. 1, when the protrusion length d becomes short, a shield defect occurs depending on the value of b-a. However, as shown in FIG. 1, even if the protrusion length d is 0 mm, if the gap b-a is 0.3 mm or less, no shielding failure occurs. Therefore, in the first invention of the present application, the gap ba is set to 0.3 mm or less. Therefore, in the first invention of the present application, it is necessary to increase the working accuracy to 0.3 mm or less.

On the other hand, in the second invention of the present application, after the suction nozzle is fitted into the shield nozzle and the position thereof is adjusted in the longitudinal direction, the tip of the suction nozzle is attached to the convex portion provided on the outer surface of the tip portion of the shield nozzle. Are brought into contact with each other, thereby eliminating the gap between the shield nozzle and the suction nozzle.

Further, in the third invention of the present application, a shield material is arranged between the shield nozzle and the suction nozzle to close the gap between them.

Further, in the fourth invention of the present application, the gap between the shield nozzle and the suction nozzle is eliminated by engaging the tip end of the suction nozzle with the tip end of the suction nozzle.

In the second to fourth inventions, the shield nozzle and the suction nozzle are brought into close contact with each other to eliminate the influence of the negative pressure of suction on the shield gas flow, and the same as in the first invention. Produce the effect of.

[0019]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a sectional view showing a first embodiment of the present invention. This fume suction torch has basically the same structure as a conventional torch. However, in the torch of this embodiment, the difference b-a between the tip inner diameter b of the suction nozzle 8 and the outer diameter a of the shield nozzle 9 is 0.3 mm or less. Such dimensional accuracy can be realized by increasing the machining accuracy of the shield nozzle 9 and the suction nozzle 8.

In the present embodiment, since the gap b-a is 0.3 mm or less, it is clear from FIG. 1 that shield failure is avoided regardless of the length of the projection length d of the shield nozzle 9. You can Therefore, the protrusion length d can be shortened to 10 mm or less, particularly 6 mm or less, and as shown in FIG. 2, extremely high fume recovery efficiency can be obtained.

FIG. 4 is a sectional view showing a second embodiment of the present invention. In the present embodiment, the convex portion 16 protruding outward is provided on the outer peripheral surface of the tip portion of the shield nozzle 15. The convex portion 16 has a triangular shape in a sectional view passing through the axis of the shield nozzle 15. Then, the suction nozzle 8 is moved in the axial direction with respect to the shield nozzle 15 from the front end side to the base end side. Then, the reduced diameter portion at the tip of the suction nozzle 8 is brought into contact with the slope of the convex portion 16 of the shield nozzle 15, and in this state, the shield nozzle 15 and the suction nozzle 8 are fixed to each other.

In this embodiment, since the tip of the suction nozzle 8 is in close contact with the convex portion 16 of the shield nozzle 15, a negative pressure is applied to the space between the suction nozzle 8 and the shield nozzle 15 so that a suction hole is formed. When the outside air containing fume from 13 is sucked into the space, the shield gas flow may be sucked from the gap between the tip of the suction nozzle 8 and the shield nozzle 15 to cause disturbance in the shield gas flow. Absent. Therefore, in FIG. 1, the state is the same as when b−a becomes 0, and the shield failure can be prevented.

FIG. 5 is a sectional view showing a third embodiment of the present invention. In this embodiment, a sealing material 17 is interposed between the tip of the suction nozzle 8 and the tip of the shield nozzle 9 to seal the two. Also in this embodiment, as in the embodiment of FIG. 4, the disturbance of the shield gas flow can be prevented.

FIG. 6 is a sectional view showing a fourth embodiment of the present invention. In FIG. 6A, the tip portion 18 of the suction nozzle 8 is curved inward and engaged with the tip portion of the shield nozzle 9. In the torch shown in FIG. 6B, the tip portion of the shield nozzle 9 is thinned to form a step, and the tip portion 19 of the suction nozzle 8 is further curved to the shield nozzle side so that the inner peripheral surface of the shield nozzle 9 is located at the step. And are flush with each other. As a result, the disturbance of the shield gas flow can be prevented. In the torch shown in FIG. 6 (c), the tip portion 20 of the suction nozzle 8 is smaller than the wraparound of the tip portion of the suction nozzle 8 in the torch shown in FIG. 6 (a). In any of these torches, the gap between the suction nozzle and the shield nozzle can be sealed, and it is possible to prevent turbulence from occurring in the shield gas flow due to the negative pressure for suction.

[0026]

[Effect of device]

 As described above, according to the present invention, the gap between the tip of the suction nozzle and the shield nozzle is set to 0.3 mm or less, or the gap is sealed. It is possible to prevent turbulence from occurring in the flow, and it is possible to maintain high fume recovery efficiency by shortening the protrusion length.

[Brief description of drawings]

FIG. 1 is a graph showing a relationship between a protrusion length d of a shield nozzle and a gap ba between a suction nozzle tip and a shield nozzle.

FIG. 2 is a graph showing the relationship between the projection length d of the shield nozzle and the fume collection efficiency.

FIG. 3 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 4 is a sectional view showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a fourth embodiment of the present invention.

FIG. 7 is a schematic view showing an entire welding device.

FIG. 8 is an external view showing a conventional fume suction torch.

FIG. 9 is a cross-sectional view showing a conventional fume suction torch.

FIG. 10 is an external view illustrating a defect of a conventional fume suction torch.

FIG. 11 is an external view similarly illustrating a defect of the conventional fume suction torch.

[Explanation of symbols]

 1; Torch 3; Torch grip 8; Suction nozzle 9,15; Shield nozzle 13; Suction hole 14; Current-carrying tip 16; Convex part 17; Sealing material 18, 19, 20; Tip part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Imaoka 100-1 Urakawachi, Miyamae, Fujisawa-shi, Kanagawa Stock Company Fuji Steel Works, Fuji Steel Works

Claims (4)

[Scope of utility model registration request] 1. A shield nozzle which fits an energizing tip and discharges a shield gas from its tip, and an atmosphere gas containing welding fumes through a suction hole which is fitted to the shield nozzle and is provided at the tip of the shield nozzle. A fume suction torch comprising: a suction nozzle for suctioning; and a difference between an outer diameter of the shield nozzle and an inner diameter of a tip portion of the suction nozzle is 0.3 mm or less. 2. A shield nozzle that fits a current-carrying tip and discharges a shield gas from its tip, and an atmosphere gas containing welding fumes through a suction hole that is fitted to the shield nozzle and is provided at the tip of the shield nozzle. A suction nozzle for sucking, and a convex portion is provided on the outer surface of the tip portion of the shield nozzle, and the tip of the suction nozzle is adjusted by adjusting the position in the longitudinal direction between the shield nozzle and the suction nozzle. The fume suction torch, wherein the fume suction torch is arranged in contact with the convex portion. 3. A shield nozzle for fitting a current-carrying tip and discharging a shield gas from its tip, and an atmosphere gas containing welding fumes through a suction hole provided at the tip of the shield nozzle and fitted with the shield nozzle. A fume suction torch comprising: a suction nozzle for suctioning; and a shield material disposed between the shield gas and a tip of the suction nozzle. 4. A shield nozzle which fits an energizing tip and discharges a shield gas from its tip, and an atmosphere gas containing welding fumes through a suction hole which is fitted to this shield nozzle and provided at the tip of the shield nozzle. A fume suction torch comprising: a suction nozzle for suctioning; and a structure in which a tip end portion of the shield nozzle and a tip end portion of the suction nozzle are engaged with each other.