JPH1099968A - Non-consumable electrode type arc torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform excellent welding while an arc torch is abutted and slides on a guide member by providing a small diameter part smaller than a projected part in diameter in the circumferential direction of a torch body and an engagement part in the axial direction to be fitted to a notched part on an inner surface of a handle on the side on which the torch body is mounted. SOLUTION: In this non-consumable electrode type arc torch, a notched part 15 in the axial direction formed in the silicon rubber of a torch body 4 is fitted to an engagement part 16 of a handle 11, and the relative position of the handle 11 to the torch body 4 around the major axis of the handle 11 is positioned, and the torch body 4 is not turned around the handle 11. Even when the force in X2 direction is applied to the torch body 4 during the welding, the welding can be performed without causing any positional displacement of the torch body 4 from the handle 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-consumable electrode type arc torch for performing processes such as welding and cutting. More specifically, the present invention relates to a so-called semi-automatic non-consumable electrode type arc torch in which an operator grips and processes an arc torch.

[0002]

2. Description of the Related Art Generally, a high frequency generator is used to generate an electric arc between a non-consumable electrode of an arc torch and a workpiece or a torch nozzle. Are taken into account as appropriate.

For example, a conventional non-consumable electrode type arc torch for performing a welding process is proposed as shown in FIG. That is, 1 is a connection fitting for connecting a power cable as described later, and 2 is a tube made of copper or a copper alloy integrally attached to the connection fitting 1. And silicone rubber 3
To form the torch body 4. Reference numeral 5 denotes a power cable. For example, the power cable 5 has an axial fluid path 6 therein, and is formed by an electrically insulating insulating jacket 8 containing a conductive member 7. The power cable 5 is attached to the base side of the torch body 4 by the connecting tool 9 provided in the section. Reference numeral 11 denotes a cylindrical handle attached to the base side of the torch body 4 and covering the power cable 5.

The silicon rubber portion on the base side of the torch body 4 is formed in a column 12, and a circumferential projection 13 is formed outside the silicon rubber column 12. On the other hand, the handle 11 is molded of, for example, a silicone resin or a tetrafluoroethylene resin, and the inner surface of the handle 11 on the torch body mounting side has a protrusion having a diameter smaller than that of the silicon rubber circumferential projection 13. A part 14 is formed.

Namely, in a state of attaching the power cable 5 to the torch body 4, causing the handle 11 is inserted through the power cable 5 is positioned displaced from the direction X ₁ in X ₂ direction. In this case, get over the protrusion 13 protrusion 14 in the circumferential direction of the silicon rubber of the handle 11 in the X ₂ direction, FIG. 11
As shown in FIG. 10, the handle 11 is attached to the torch body 4 as shown in FIG. 10 in a state where the protrusion 13 of the silicone rubber is elastically deformed by the protrusion 14 of the handle 11.

Of course, when silicon rubber is used as an insulator of the torch body 4 to prevent high-frequency leakage, the torch body 4 and the handle 11 cannot be attached by screwing because the hardness of the silicon rubber is low. .

For this reason, the silicon rubber is elastically deformed as described above, and the handle 11 is fixed to the torch body 4 by a so-called frictional force, and for example, the shielding gas and the electric power supplied by the power cable 5 are supplied to the torch body 4. While being appropriately guided and supplied to the distal end side of the arc torch by the conductive tube 2, the operator holds the handle 11.
, And semi-automatic arc machining is performed.

[0008]

Recently, however, the absolute number of skilled welding workers has been drastically reduced. When an unskilled worker performs semi-automatic welding while holding a holder of a welding torch, continuous welding is not possible. In most cases, a so-called hand-shake phenomenon of the welding torch occurs, in which the tip position of the welding torch is displaced up and down and left and right with respect to the welding line.

For this reason, when an unskilled worker performs semi-automatic welding, in order to prevent camera shake of the welding torch, FIG.
As shown at 0, a guide member G is attached along a line to be welded, and the tip of a welding torch, for example, a gas nozzle N, is slid while being in contact with the guide member G.

As described above, when the welding torch comes into contact with or slides on the guide member G at the time of welding, in order to stabilize the position of the welding torch, an operator who presses the welding torch against the guide member G is required. A force acts, and a frictional force between the welding torch and the guide member pressed by the force of the operator acts on the handle 11 gripped by the welding operator.

When the frictional force between the welding torch and the guide member during welding acts to rotate the torch body 4 with respect to the handle 11, as described above, the torch body 4 and the handle 11 It is attached by frictional force that elastically deformed rubber,
Since the frictional force due to the elastic deformation for attaching the torch body 4 to the handle 11 is small, the torch body 4
In many cases, the rotational force acting on the motor becomes larger.

As described above, when the rotational force acting on the torch body 4 is larger than the frictional force for attaching the torch body 4, the torch body 4 is moved relative to the handle 11 gripped by the operator. , The target position of the welding torch fluctuates, and as a result, a defective welding portion is generated.

The present invention has been made in view of the above-mentioned problems, and has as its object to contact / slide an arc torch using silicon rubber as an insulator of a torch body with a guide member in order to prevent high-frequency leakage. An object of the present invention is to provide a non-consumable electrode-type arc torch that can perform good machining while moving.

[0014]

In order to achieve the above object, the first aspect of the present invention is to provide at least a power cable connection fitting, a fluid path, and a power supply path on a base side of a torch body integrally formed of silicone rubber. The present invention is applied to a non-consumable electrode type arc torch equipped with a power cable for supplying shielding gas and power and a cylindrical handle for covering the power cable. The feature is that the silicon rubber portion on the base side of the torch body is formed in a column,
A circumferential convex portion and an axial cutout portion are provided outside the cylinder, and a small-diameter portion having a smaller diameter than the circumferential convex portion of the torch body is provided on the inner surface of the handle on the torch body mounting side. And an axial engaging portion that fits into the notch.

According to a second aspect of the present invention, in the first aspect,
The small diameter portion is a protrusion protruding from an inner surface of the handle.

Further, the third invention is characterized in that, in the first or second invention, two or more notch portions and engagement portions to be fitted are arranged in a circumferential direction. .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. For example, a non-consumable electrode type arc torch used for a welding operation will be described. 1 to 6
FIG. 10 is a view showing an embodiment of the present invention. In these configurations, the structure is substantially the same as that of the arc torch shown in FIG. 10 except for the mounting structure between the torch body and the handle as described later. Therefore, the same reference numerals are given to the same components as those in FIG.
For the description of the configuration of each unit, the description of FIG. 10 is referred to. 1 to 6, a non-consumable electrode type arc torch has a torch body 4 in which a connection fitting 1 and a conductive tube 2 are integrally formed of silicone rubber 3 and a connecting tool 9 on a base side of the torch body 4. It comprises a power cable 5 to be attached and a cylindrical handle 11 made of molded resin which is attached to the base side of the torch body 4 and covers the power cable 5.

The silicon rubber portion on the base side of the torch body 4 is formed in a cylinder 12, and a projection 13 in the circumferential direction and a cutout 15 in the axial direction are provided outside the cylinder 12 of silicon rubber. Have been. In the case shown in the figure, three convex portions 13 in the circumferential direction are provided apart from each other in the long axis direction of the cylinder 12, and the cutouts 15 in the axial direction are arranged uniformly in the circumferential direction.
Are provided.

In the case of the drawing, the notch depth of the notch 15 in the axial direction is the same as the depth of the notch 15 in the circumferential direction.
The notch 15 is formed in the circumferential projection 13, and is not shown on the surface of the cylinder 12.

On the other hand, on the inner surface of the cylindrical handle 11 on the side where the torch body is mounted, a small-diameter portion smaller in diameter than the convex portion 13 is provided.
For example, a projection 14 protruding from the inner surface of the handle, and an axial engaging portion 16 fitted into the cutout 15 are provided. In the case shown, the small-diameter projection 14 is
Is provided on the inner surface of the vehicle.

In the non-consumable electrode type arc torch having the above-described structure, the handle 1 having the power cable 5 inserted therethrough with the power cable 5 attached to the torch body 4.
1 while taking care of the positions of the handle 11 and the torch body 4 so that the notch 15 of the torch body 4 and the notch 15 of the torch body 4 can be fitted to each other. Approach each other in the direction.

That is, while the engaging portion 16 of the handle 11 and the notch 15 of the torch body 4 are fitted, the handle 1
1 and the torch body 4 approach each other in the X direction, and the projection 14 of the handle 11 is
The ride over the X ₂ direction, as shown in FIG. 6, as the convex portion 13 of silicon rubber by the projection portion 14 of the handle 11 is in an elastically deformed state, as shown in FIGS. 1 and 3,
The handle 11 is attached to the torch body 4.

As described above, the non-consumable electrode type arc torch according to the present invention, in which the power cable 5 and the handle 11 are attached to the torch body 4, has an axial cutout 15 formed in the silicon rubber of the torch body 4. And handle 11
And the relative position of the handle 11 and the torch body 4 about the long axis of the handle 11 is positioned, and the protrusion 14 of the handle 11 is 13 is elastically deformed, and the relative positions of the handle 11 and the torch body 4 in the longitudinal direction of the handle 11 are positioned.

That is, as shown in FIG. 1, when welding the tip of the welding torch, for example, the gas nozzle N, to the guide member G along the line to be welded while contacting / sliding, the pressing is performed by the force of the operator. The frictional force between the welding torch and the guide member is changed by the handle 1 gripped by the welding operator.
As described above, the non-consumable electrode type arc torch according to the present invention has the axial cutout 15 formed in the silicon rubber of the torch body 4 and the engaging portion 16 of the handle 11 fitted. In addition, since the relative positions of the handle 11 and the torch body 4 around the long axis of the handle 11 are determined, the torch body 4 does not rotate with respect to the handle 11.

Of course, the projection 14 of the handle 11 elastically deforms the silicon rubber projection 13 of the torch body 4 as before, and the relative position of the handle 11 and the torch body 4 in the longitudinal direction of the handle 11 is determined. because they are, also act in the X ₂ direction of the force is the torch body 4 during welding, it is possible to perform the welding operation without the torch body 4 is positioned displaced relative to the handle 11.

As described above, the non-consumable electrode type arc torch according to the present invention is an arc torch using silicon rubber as an insulator of the torch body in order to prevent high frequency leakage, and the arc torch is applied to the guide member. Good working can be performed while contacting and sliding.

FIG. 7 is a view showing another embodiment of the present invention. In FIG.
A contact portion between the handle 1 and the inner surface of the handle 11 is formed as long as L _1, and notches 15, 15 in the axial direction are provided on the protrusions 13, 131 provided outside the cylinder, respectively. X ₂ direction from the end face by L ₂ X ₁ axial engaging portion 16 corresponding to the intruding position in a direction substantially the length L ₁ in the X ₁ direction is formed on the inner surface of the handle 11.

Of course, the silicon rubber projection 13
1 and the inner surface of the handle 11 are L _{1 in the} longitudinal direction.
If it is a long form, attached condition has stabilized the handle 11, and if the fitting length of the notch 15 and the axial direction of the engaging portion 16 of the handle of the silicon rubber is formed long as L ₁ Even when the silicon rubber has low hardness, the fitting state between the notch 15 of the silicon rubber and the engaging portion 16 in the axial direction of the handle is stabilized.

FIGS. 8 and 9 are views showing a main part of still another embodiment of the present invention, in which a torch body 4 is provided outside a silicon rubber cylinder 12 and is parallel to a circumferential projection 13. Along with the axial cutouts 15, 15, parallel axial engaging portions 16, 16 that fit into the cutouts 15, 15 are formed on the inner surface of the handle 11. A small-diameter projection 14 similar to that shown in FIG. 6 is formed on the inner surface of the handle 11. With such a structure in which the parallel notches 15 and 15 and the engaging portions 16 and 16 are fitted to each other, even if the silicon rubber is low in hardness, the notch 15 of the silicon rubber and the axial direction of the handle can be used. Is stable with the engaging portion 16.

If the small-diameter projection 16 formed on the inner surface of the handle on the side of the torch body mounting side is formed over the entire inner surface, the projection 16 elastically deforms the silicone rubber to attach the handle to the torch body. Can be installed stably.

Nevertheless, the projections 16 formed on the inner surface of the handle are smaller in diameter at the two or more positions on the inner surface of the handle than the circumferential protrusions of the silicone rubber of the torch body. Can protrude inward.

Further, a portion smaller in diameter than the circumferential protrusion of the silicon rubber of the torch body is formed on the inner surface of the handle to elastically deform the silicon rubber. For example, the inner diameter of the handle is smaller than the protrusion. When the handle is mounted on the torch body, the silicone rubber is elastically deformed in the radial direction by the cylindrical inner surface of the handle, and the handle can be mounted on the torch body.

Of course, the non-consumable electrode type arc torch according to the present invention can be applied to an arc torch such as so-called TIG welding, plasma cutting or plasma welding.

Further, the present invention can be applied to a so-called water-cooled arc torch in which a water supply / drain passage is provided in a power cable.

[0035]

As is apparent from the above description, the non-consumable electrode type arc torch according to the present invention has a base side of a torch body in which a power cable connection fitting, a fluid path and a power supply path are integrally formed of silicon rubber. A non-consumable electrode type arc torch to which at least a shielding gas and a power cable for supplying power and a cylindrical handle covering the power cable are attached, and a silicon rubber portion on the base side of the torch body is formed in a column. A convex portion in the circumferential direction and a notch portion in the axial direction are provided on the outside of the cylinder, and a small-diameter portion having a smaller diameter than the convex portion in the circumferential direction of the torch body is provided on the inner surface of the handle on the torch body mounting side. Since an axial engaging portion that fits into the notch is provided, an arct using silicon rubber as an insulator of the torch body to prevent high-frequency leakage. Even if the machining is performed while abutment and sliding of the torch on the guide member, the torch body does not rotate with respect to the handle. And good processing can be performed.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is an enlarged partial cross-sectional front view showing a main part in FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 3;

FIG. 6 is an enlarged cross-sectional view of a part “a” in FIG. 3;

FIG. 7 is a partial sectional front view showing a main part of another embodiment of the present invention.

FIG. 8 is a sectional view showing a main part of still another embodiment of the present invention, and is a view corresponding to FIG. 4;

FIG. 9 is a cross-sectional view showing a main part of another embodiment of the present invention, and is a view corresponding to FIG.

FIG. 10 is a partial cross-sectional front view showing a conventional example.

FIG. 11 is an enlarged cross-sectional view of a portion “b” in FIG. 10;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Connection metal fitting 2 Conductive tube 3 Silicon rubber 4 Torch body 5 Power cable 11 Cylindrical handle 12 Silicon rubber cylinder 13 Circumferential projection provided outside cylinder 12 14 Provided on handle inner surface A protrusion having a smaller diameter than the circumferential protrusion 13 of silicon rubber 15 an axial cutout provided outside the cylinder 12 16 an axial engaging portion provided on the inner surface of the handle

Claims (3)

[Claims] 1. A power cable for fitting a power cable, a fluid path, and a power supply path are integrally formed of silicone rubber. In the non-consumable electrode type arc torch, the silicon rubber portion on the base side of the torch body is formed in a cylinder, and a circumferential projection and an axial cutout are provided outside the cylinder. Non-consumable, provided on the inner surface of the handle on the torch body mounting side, a small-diameter portion smaller in diameter than the circumferential protrusion of the torch body and an axial engaging portion fitted to the cutout portion. Electrode type arc torch. 2. The non-consumable electrode type arc torch according to claim 1, wherein the small diameter portion is a projection projecting from an inner surface of the handle. 3. The non-consumable electrode type arc torch according to claim 1, wherein two or more of the notched portion and the engaging portion to be fitted are provided in a circumferential direction.