JPH0249833B2 - YOSETSUYOTOOCHI - Google Patents

Description

TECHNICAL FIELD The present invention relates to a welding torch that uses a welding wire as a consumable electrode.

Prior Art Generally, when consumable electrodes are used, power is supplied to the electrode wire through a contact member that comes into contact with the electrode wire, but in some cases the feeding position of the electrode wire does not change and the contact member is subject to severe wear. Products with long lifespan are desired. In order to cope with this problem, the applicant of the present invention has provided a welding torch as shown in Japanese Patent Application No. 193138/1980 (Japanese Patent Application Laid-Open No. 93580/1982). That is, in FIGS. 1 to 3, the contact member 7 is composed of a power feeding member 6 having a through hole 601 for a consumable electrode wire and a cylindrical support member 5 that supports the power feeding member 6, Electrode wire 2
The free end of the fixed guide member 4 that guides the welding torch is inserted into the contact member 7, and the power supply connecting member 12 and the contact member 7 are arranged on the base side of the welding torch, that is, on the X ₂ direction side. A fixed cylindrical body 11 is provided which covers the flexible connecting member 9 and the base side of the contact member 7 from the base side of the welding torch. Electrode wire 2 is supported by opposing support pins 22' arranged on cylindrical body 11.
The contact member 7 is supported so as to be tiltable in the Z direction on a plane including the axis of 6, and the contact member 7 is restrained and supported in a direction substantially perpendicular to the plane, that is, the Y direction, and the support pin 22' is the rotation center. A pressurizing means 23 is provided for urging the contact member 7 toward the electrode wire. Therefore, regardless of the wear of the contact member 7, power is supplied in a steady state, and since the target position of the electrode wire is substantially constant, good welding can be performed.

By the way, in the welding torch described above, the pressing force of the pressing means 23 acts on the electrode wire 26 via the power supply member 6 of the contact member 7, but this urging force is restrained by the fixed guide member 4 and the electrode The wire 26 was being positioned. In this case, the pressurizing force varies depending on the material of the electrode wire 26, the bending of the electrode wire, etc., but in spite of this, in order to ensure the positioning of the electrode wire, the rigidity of the fixed guide member 4 itself must be adjusted. I had to make it bigger. That is, the fixed wire guide member 4 in the welding torch is supported in a cantilever manner, and from the relative relationship of the pressing force to its length _L1 , in order to reliably maintain the target position of the electrode wire 26, The rigidity of the fixed wire guide member 4 itself must be increased, that is, the cross-sectional area must be increased, resulting in a disadvantage that the welding torch becomes thick and heavy.

Generally, this type of welding torch is often used to weld narrow areas, so it is not desirable for the welding torch to be thick and heavy.

Purpose of the Invention The present invention has been made in view of the above problems, and is capable of supplying power in a steady state regardless of wear of the contact members, and furthermore, the aiming position of the electrode wire is constant and the present invention is as compact as possible. It is an object of the present invention to provide a welding torch that can also be lightweight.

Embodiments The present invention will be described in detail below with reference to illustrated embodiments. In FIGS. 4 to 8, 1 is a torch body with a through hole 101 bored in the axial center, and 2 is a wear-resistant guide tube detachably disposed in the through hole 101, for example, approximately at the axial center. A hole with a circular cross section is bored in the part. 3 has a through hole 30 approximately at the shaft center.
1 is a wear-resistant guide block with a hole, for example, this guide block 3 is attached to the torch body 1.
It is screwed onto the end in the _X1 direction. The torch body 1, guide tube 2 and guide block 3 constitute a fixed guide member 4 for guiding the electrode wire 26. 5 is a cylindrical support member; 6 is a power feeding member having a through hole 601 formed approximately in the axial center and a bottomed hole 602 opening in the _X2 direction; for example, this power feeding member 6 is It is screwed onto the end of the support member 5 in the _X1 direction.
The support member 5 and the power supply member 6 constitute a contact member 7, and the contact member 7 is made of a highly conductive material, such as copper or a copper-based alloy. The free end of the fixed guide member 4 is inserted inside this contact member 7 . Reference numeral 8 denotes an intermediate member, and the intermediate member 8 and the support member 5 are connected by a flexible connecting member 9, for example, a cylindrical braided wire made of copper or a copper-based alloy. 1
1 is a fixed cylindrical body that covers the base side of the contact member 7;
2 is a power supply device connection member, and this power supply device connection member 12
and the fixed cylindrical body 11 are mutually positioned by a rotational positioning tool 131, such as a key material, and are integrally supported by a fastening tool 141, such as a nut. Also, the intermediate member 8 and the fixed cylindrical body 1
1 and 1 are positioned relative to each other by a rotational positioning tool 132, for example, a key material, and are integrally supported by a fastening tool 142, for example, a cap nut. The torch body 1 is inserted through the approximate axis of the intermediate member 8 and supported integrally with the intermediate member 8 by a fastener 143, for example, an adapter screwed onto the end of the intermediate member 8 in the _X2 direction. . Reference numeral 15 denotes a groove provided on the outer periphery of the base side of the torch body 1. The groove 15 communicates with grooves 151, 151 extending in the axial direction provided on the outer periphery of the torch body 1, and connects the torch body 1 and the support member. It communicates with a cylindrical space 31 formed by 5 and 5. Reference numeral 16 denotes a shielding gas connection port formed in the power supply connection member 12, for example, and the connection port 16 and the torch body 1 are connected to each other.
The groove 15 provided on the outer periphery of the groove 15 is communicated with the groove 15 through a perforation hole 17 passing through an appropriate member. 18
As shown in FIG. 8, for example, a fixed cylindrical body 11
19 is a locking piece inserted into the shaft core of the pin member 18; 21 is a set screw screwed onto the pin member 18 and abutting the end of the locking piece 19, for example; , these 18, 19, and 21 constitute a support pin 22. This support pin 2
2 are disposed on a fixed cylindrical body 11, facing each other and being spaced apart from each other, for example, in the Y direction. For example, in this support pin 22, a stepped portion 181 provided at the tip of the pin member 18 engages in a hole drilled in the support member 5 to position the support member 5 in the X direction and the Z direction. By appropriately adjusting the positions of the pin members 18, 18 in the Y direction, the support member 5 is approximately positioned in the Y direction as well. Note that the support member 5 is the axis of the pin member 18, that is, the support pin 2
It is supported so as to be tiltable in the Z direction centering on the axis of No. 2. Further, in the illustrated case, in the support pin 22, the locking piece 19 is inserted into a hole drilled in the axis of the pin member 18, and is formed in a tapered shape that spreads in the radial direction. Operate the set screw 21 so that the tip comes into contact with the torch body 1. In this case, by appropriately adjusting the positions of the set screws 21, 21 in the Y direction, the torch body 1, that is, the tip end of the fixed guide member 4, is selected at a desired position in the _Y1 direction or _Y2 direction.
Of course, in this case, since the tapered end portions of the locking pieces 19, 19 are in contact with the torch body 1,
The torch body 1, ie, the fixed guide member 4, is accurately positioned also in the Z direction. 23 is the 7th
As shown in the figure, for example, the support pin 2
A bush 231 screwed onto the fixed cylindrical body 11 at a position on the X ₂ direction side of X 2, an adjustment screw 232 screwed onto this bush 231, and between this adjustment screw 232 and the support member 5. A disposed spring member 233, for example a compression spring member, and a lock nut 2 for locking the adjustment screw 232 after position adjustment.
34 constitutes the pressurizing means 23. Note that in order to electrically protect the spring member 233, the bush 231 may be formed of an electrically insulating material, or the bush 231 may be formed of an electrically insulating material, or
It is preferable to provide a spring receiver made of electrically insulating material on the side. 24 is a suitably elastic airtight member such as a "0" ring or a gasket, and 25 is a support member 5.
The gas nozzle 25 is detachably supported at the free end of the gas nozzle.For example, the gas nozzle 25 is composed of an electrically insulating nozzle 251 and a metal nozzle 252. A gas supply pipe is connected to the shielding gas connection port 16, and a power supply device is connected to the power supply device connection member 12 via the attachment hole 120. The welding torch is connected to the mounting member 2 through the electrically insulating member 27.
8 as appropriate.

In the above configuration, the electrode wire 26 is fed by a wire feeding device (not shown), and the electrode wire 26 is
After the contact member 7 reaches the perforated hole 601 of the power supply member 6, power is supplied to the contact member 7 via the power supply tool, and the electrode wire 26 is fed while the shielding gas is discharged to perform welding.

In the illustrated case, airtight members 291, 292, 293 are appropriately arranged at the base of the welding torch, and the shielding gas supplied from the connection port is
It flows into the cylindrical space 31 formed by the support member 5 and the torch body 1 through the drilled hole 17 → groove 15 → grooves 151, 151, etc., and is arranged around the circumference of the torch body 1 at approximately equal intervals in the radial direction. It flows into the cylindrical space 34 in the gas nozzle 25 through two or more provided perforations 32, 32, for example four holes and similar perforations 33, 33.

Incidentally, as the welding progresses, the portion of the power feeding member 6 corresponding to the power feeding position gradually wears out, but the power feeding member 6 supported by the supporting member 5 is in a state where it is urged in the _Z1 direction by the pressurizing means 23. Therefore, regardless of wear of the power feeding member 6, the power feeding member 6 and the electrode wire 26 are always in contact with each other, and power feeding is reliably performed in a steady state. Moreover, the gas nozzle 25 is supported by the free end of the contact member 7, and the gas nozzle 25 and the contact member 7 rotate integrally around the support pin 22, so that regardless of the wear of the power supply member 6,
The cylindrical space 34 defined by the gas nozzle 25 and the contact member 7 is always maintained in a constant shape. If the cylindrical space 34 within the gas nozzle 25 is maintained in a constant state in this manner, the ejection flow of the shielding gas is also maintained constant, and uniform welding can be performed. Note that since the electrode wire 26 is restrained by the fixed guide member 4, especially the guide block 3, it is fed to a fixed position in the Z direction regardless of whether the power feeding member 6 is worn out. As the member 6 wears out, the gas nozzle 25 and the contact member 7 rotate together in the _Z1 direction about the support pin 22, and the axis of the electrode wire 26 and the jet flow of the shielding gas flowing out from the gas nozzle 25 rotate together. There is a concern that the axis will not match. However, in general, the distance between the power supply member 6 and the workpiece to be welded is 10 to 30 mm.
The shielding gas, which is selected to be about mm in diameter and ejected from the gas nozzle 25, is an annular laminar flow and is ejected over a relatively wide area including the welding point. Even if the axes of the gas do not coincide with each other, the gas shielding effect does not substantially change. Furthermore, particularly in the present invention, opposing support pins 22 disposed in a fixed cylindrical shape 11 support the contact member 7 in a tiltable manner on a plane including the axis of the electrode wire, and are substantially orthogonal to the plane. The support pin 22 restrains and supports the contact member 7 in the direction in which the contact member 7 is tilted, and the support pin 22 locks the fixed guide member 4 in the tilting direction of the contact member 7 by the locking piece 19 coming into contact with the free end of the fixed guide member 4. Stop. That is, since the locking pieces 19, 19 of the support pin 22 lock the fixed guide member 4, the pressing force of the pressurizing means 23 acting on the electrode wire 26 via the contact member 7 is as if the fixed guide member 4 is in a state of cantilever support with the support pin 22 as the base. The cantilever length in this case is indicated by L ₂ . now,
Assuming that the support pin 22 is not provided with the locking piece 19, the cantilever length of the fixed guide member 4 with respect to the pressing force of the pressing means 23 is
Denoted by L ₁ . For example, when the pressing force of the pressing means 23 acting on the tip of the fixed guide member 4 is W, the deflection that may occur at the free end of each of the above cantilevers; δ ₁ and δ ₂ are calculated by the following formula. It is expressed as

δ ₁ = WL ₁ ³ /3EI, δ ₂ = WL ₂ ³ / _3EI (E: Young's modulus, I: moment of inertia of cross section) Therefore, for example, when L 2 = 0.6L ₁ , δ ₂ = 0.6 ³・WL ₁ ³ /3EI=0.6 ³・δ ₁ ≒ δ ₁ /5. That is, the support pin 22 provided with the locking piece 19
The cantilevered length of the fixed guide member 4 is L ₂
= 0.6L ₁ , the deflection at the tip of the fixed guide member 4 is 1/5 as described above, so even if the moment of inertia of the cross section is selected to be half, δ ₂ = 0.4 It is only δ ₁ .
Therefore, the rigidity of the fixed guide member 4 can be selected to be small, and if the cross-sectional area of the fixed guide member 4 disposed at the axial center of the welding torch is selected to be small in this way, the fixed guide member 4 can be made small. The supporting member 5 and the fixed cylindrical body 11, which are successively disposed outside of the housing 4, can be made compact. That is, the welding torch can be made as compact and lightweight as possible. 9 and 10 are left sectional views showing main parts of other embodiments of the present invention, respectively, and FIG.
In the figure, a support pin 22 is constructed by integrally forming a pin member 18, a locking piece 19, and a set screw 21. In FIG. 10, a support pin 22 is constituted by a pin member 18 and a locking piece 19 formed integrally, and a set screw 21. When the support pins 22 shown in FIGS. 9 and 10 are disposed facing each other, each locking piece 1
9 and 19, the torch body 1, that is, the fixed guide member 4 is positioned in the Z direction. In this case, the stepped portions 181, 1 of the pin members 18, 18, respectively.
The interval in the Y direction formed by the support member 81 is formed to be somewhat larger than the width across the support member 5 in the Y direction.

Note that if the support pins shown in FIGS. 9 and 10 are made to face each other, the support pins 22 disposed in the Y ₁ direction and the Y ₂ direction, the holes in the torch body 1, and the support There is a concern that positioning each of the holes of the member 5 becomes extremely troublesome.
In this case, the support pins 22 shown in FIGS. 9 and 10 are arranged on one side in the Y direction, and the support pin 22 shown in FIG. 8 is arranged in the opposite position in the Y direction. This allows the support state of the torch body 1 and the tilting state of the support member 5 to be adjusted separately. If the support pin is configured as shown in FIGS. 8 to 10, the fixed cylindrical body 11
Since the support pin 22 can be freely attached and detached from the
Although this is advantageous in terms of maintenance as a welding torch, the support pin 22 can nevertheless be fixed to the fixed cylindrical body 11.

In addition, in the welding torch shown in FIG. 1, the support pin 2 shown in FIGS.
2 and 22, it is of course included within the scope of the present invention. That is, the support pins 22,2
The two locking pieces 19, 19 abut against the free end of the fixed guide member 4 and lock the fixed guide member 4 in a relatively short cantilevered state, making the welding torch as compact as possible. It can be made lighter. In this case, the cylindrical space 3 inside the fixed cylindrical body 114
In the case where the shielding gas is allowed to flow into the shield 4' appropriately, as the power supply member 6 wears out, the contact member 7 tilts in the _Z2 direction, so that the shape of the cylindrical space 34' changes. Therefore, the jet flow of the shielding gas changes depending on the wear of the power supply member 6, but it can be applied when the flow rate of the shielding gas is large or when performing so-called low-grade welding using CO ₂ gas or the like. To deal with this, the cylindrical members 113, 1
The present invention can be applied to a so-called side shield type in which the shield 14 is removed and a supply pipe is provided for supplying shielding gas toward the welding part. Further, the welding torch according to the present invention can be applied to so-called no-gas welding and submerged arc welding.

Effects of the Invention As described above, according to the present invention, power is supplied in a steady state regardless of wear of the contact member, the target position of the electrode is constant, and the locking piece of the support pin is connected to the fixed guide member. Since the fixed guide member is held against the free end in a relatively short cantilevered state, the fixed guide member can be made with relatively low rigidity, making the overall structure as compact and lightweight as possible. It is possible to realize a welding torch with a long lifespan that can be used for a long time.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing a conventional example, FIGS. 2 and 3 are sectional views taken along lines - and -, respectively, in FIG. 1, FIG. 4 is a plan sectional view showing an embodiment of the present invention, and FIG. Figures to Figures 8 are the - line in Figure 4, respectively.
- line, - line and - line sectional view, 9th
This figure and FIG. 10 are left sectional views showing essential parts of other embodiments of the present invention, and correspond to FIG. 8, respectively. 1...Torch body, 4...Fixed guide member, 5...Supporting member, 6...Power supply member, 7...
Contact member, 9... Flexible connection member, 11... Fixed cylindrical body, 12... Power supply device connection member, 18...
Pin member, 19... Locking piece, 22... Support pin,
23...pressure means, 26...electrode wire.

Claims (1)

[Scope of Claims] 1. A contact member is constituted by a power supply member having a through hole for a consumable electrode wire and a cylindrical support member that supports the power supply member, and a fixed guide member that guides the electrode wire. The free end of the contact member is inserted into the contact member, and the power supply connecting member disposed on the base side of the welding torch and the support member of the contact member are connected by a flexible connecting member, and welding is performed. A fixed cylindrical body is provided that covers the flexible connecting member and the base side of the contact member from the base side of the torch, and the axis of the electrode wire is aligned by opposing support pins arranged on the cylindrical body. the contact member is tiltably supported on a plane including the plane, the contact member is restrained and supported in a direction substantially perpendicular to the plane, and pressure is applied to urge the contact member toward the electrode wire with the support pin as a rotation center; In the welding torch, the support pin includes a guide that passes through the contact member, contacts the free end of the fixed guide member, and is fixed with respect to the tilting direction of the contact member. A welding torch equipped with a locking piece that locks parts. 2. The welding torch according to claim 1, wherein the locking piece is detachably attached to the support pin. 3. The locking piece has a distal end formed in an unwidened tapered shape that spreads in the radial direction.
The welding torch according to item 1 or 2.