JPH0211989Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 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 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. The contact member 7 is supported tiltably in the Z direction on a plane including the axis of the electrode wire 26 by opposing support pins 18 and 18 disposed on the cylindrical body 11, and also in a direction substantially perpendicular to the plane, that is, Y. Pressure means 23 was provided to restrain and support the contact member 7 in the direction and urge the contact member 7 toward the electrode wire with the support pins 18, 18 as rotation centers. 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 by a cantilever, and from the relative relationship of the pressing force to the length L, in order to reliably maintain the target position of the electrode wire 26, it is necessary to The wire guide member 4 itself had to have a large rigidity, that is, a large cross-sectional area, which resulted in a disadvantage that the welding torch became 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 was developed in view of the above problems, and is capable of supplying power in a steady state regardless of the wear of the contact members, while keeping the target position of the electrode wire constant, and making it 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 the 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 through hole 601 bored approximately in the axis,
The power feeding member 6 has a bottomed hole 602 that opens in the _X2 direction. For example, the power feeding member 6 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 portion of the fixed guide member 4 is inserted inside this contact member 7 . Reference numeral 8 denotes an intermediate member, and this intermediate member 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. 11 is a fixed cylindrical body that covers the base side of the contact member 7; 12 is a power supply connection member; the power supply connection member 12 and the fixed cylindrical body 11 are connected to a rotational positioning member 131, such as a key material; The fasteners 14 are positioned relative to each other by
1. For example, it is integrally supported by a nut. Further, the intermediate member 8 and the fixed cylindrical body 11 are positioned with respect to each other by a rotational direction positioning tool 132, such as a key material, and are integrally supported by a fastening tool 142, such as a cap nut. The torch body 1 is inserted into the approximate axis of the intermediate member 8 and the fastener 1 is inserted into the intermediate member 8.
43, is supported integrally with the intermediate member 8 by, 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;
5 communicates with grooves 151, 151 extending in the axial direction provided on the outer periphery of the torch body 1, and communicates with the cylindrical space 31 formed by the torch body 1 and the support member 5. Reference numeral 16 denotes a connection port for shielding gas, which is formed in the power supply connection member 12, for example. The holes 17 communicate with each other. Reference numeral 18 denotes a support pin screwed onto the fixed cylindrical body 11, and the support pins 18 are disposed on the fixed cylindrical body 11 so as to face each other and to be spaced apart from each other in the Y direction, for example. For example, the stepped portion 181 provided at the tip of the support pin 18 may fit into a hole drilled in the support member 5 to move the support member 5 to the
By positioning the support member 5 in the Y direction and the Z direction, and adjusting the positions of the support pins 18 and 18 appropriately in the Y direction, the support member 5 can also be approximately positioned in the Y direction. Of course, the support member 5 is supported by the support pin 18.
It is supported so as to be tiltable in the Z direction around the axis. Reference numeral 19 denotes a spherical body disposed outside the fixed guide member 4 at positions corresponding to the support pins 18, 18, and the radius of this spherical body 19 is substantially the same as the radius of the cylindrical support member 5. It is formed. As shown in FIG. 7, the spherical bodies 19 are appropriately removed in the _Y1 and _Y2 directions.
That is, the spherical bodies 19, 19 are in contact with the inner surface of the support member at positions substantially orthogonal to the support pins 18, 18 facing each other. 23 is a pressurizing means, for example, a bush 231 screwed onto the fixed cylindrical body 11 at a position on the X ₂ direction side of the support pin 18; and an adjustment screw 232 screwed onto this bush 231;
The pressure means 23 is constituted by a spring member 233, such as a compression spring member, disposed between the adjustment screw 232 and the support member 5, and a lock nut 234 that locks the adjustment screw 232 after position adjustment. In order to electrically protect the spring member 233, it is preferable that the bush 231 be made of an electrically insulating material, or that a spring receiver made of an electrically insulating material be provided on the supporting member 5 side or the adjustment screw 232 side of the spring member 233. . 24 is an appropriately elastic airtight member such as an "O" ring or a gasket, and 25 is a gas nozzle detachably supported on the free end of the support member 5. For example, this gas nozzle 25 includes an electrically insulating nozzle 251 and a metal The nozzle 252 is composed of the following. 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 appropriately supported by a mounting member 28 via an electrically insulating member 27.

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

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 Z ₂ 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 18, 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 constant position in the Z direction regardless of whether the power feeding member 6 is worn out. As the shielding member 6 wears out, the gas nozzle 25 and the contact member 7 integrally rotate in the _Z2 direction about the support pin 18, and the axis of the electrode wire 26 and the jet flow of the shielding gas flowing out from the gas nozzle 25 rotate. There is a concern that the axis of the However, generally the distance between the power supply member 6 and the object to be welded is 10~
The shielding gas, which is selected to be about 30 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, so that the axis of the ejected flow of the shielding gas and the electrode wire 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, the contact member 7 is tiltably supported by opposing support pins 18, 18 disposed on the fixed cylindrical body 11, and a spherical body 19 disposed on the fixed guide member 4, 19 to the opposing support pin 1
The support member 5 is brought into contact with the inner surface of the support member 5 at a position substantially perpendicular to the support members 8 and 18. For this reason, the fixed guide member 4
When a force in the Z ₂ direction, that is, a pressing force of the pressing means 23 due to contact between the contact member 7 and the electrode wire 26 is applied to the free end of the spherical bodies 19, 19, the support member 5 and the support pin 18, With each of the 18 configurations,
The fixed guide member 4 is as if it were a support pin 18,1.
It is supported so that it can tilt in the _Z2 direction with the axis of 8: O as the center. Therefore, as shown in FIG. 9, the tip of the fixed guide member 4 is A, the fixed support part is B, the pressing force of the pressurizing means 23 acting on the tip A is W, and the reaction force acting on point O is R. Assume that B and O remain on the same horizontal line despite the action of W. However, E: Young's modulus, I: moment of inertia of the cross section.

First, let Y O _{and Y A} be the respective deflections at the positions corresponding to point O and point A, which are displaced by W in a state where point O is not freely supported, and the following equation holds true.

Y _A = WL ³ /3EI ...(1) Y _O = WL ³ /3EI (1-3l/2L+l ³ /2L ³ ...(2) Next, ignoring W, due to R acting on the free support point O The respective deflections at the positions corresponding to point O and point A are
Assuming Y _O ′ and Y _A ′, the following equation holds true. becomes a straight line.

Y _A ′=R・a ³ /3EI+R・l・a ² /2EI …(3) Y _O ′=R・a ³ /3EI …(4) Point B and point O are maintained on the same horizontal line From the _equations (2), (4), and (5) above, R=3L−a/2· _aW (6). From the above equations (1), (3), and (6), the actual deflection ΔY _A of point A due to W is ΔY _A = Y _A −Y _A ′=W/12EIl ² (4L−a) ……(7 ) becomes. Now, in Figure 4, if we assume that the relationship of l = 0.6L, a = 0.4L ... (8) holds, then from equations (7) and (8) above, △Y _A = WL ³ /3EI x 0.324 ...(9) becomes. That is, from the above equations (1) and (9), the following equation holds: △Y _A ≒ 1/3 Y _A ... (10) As above, for example, when the free support point: O is provided at a position 0.6L from the free end. The deflection of the free end of the fixed guide member 4 is approximately 1/3 of that in the case of so-called cantilever support, in which no free support point is provided. 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. A supporting member 5 and a fixed cylindrical body 1 are sequentially disposed outside of 4.
1 can be made compact. That is, the welding torch can be made as compact and lightweight as possible.

Note that the spherical body 19 and the fixed guide member 4 can be formed integrally, but if the spherical body 19 is configured to be detachable from the fixed guide member 4,
The number of parts to be replaced when the spherical body 19 wears out can be reduced, and the spherical body 19 is easy to manufacture. Further, if the support pins 18, 18 are configured to be detachable from the fixed cylindrical body 11, it is advantageous in terms of maintenance of the welding torch. It can be fixed at 11.

In addition, in the welding torch shown in FIG.
Of course, if the spherical body 19 shown in FIGS. 7 and 8 is disposed on the fixed guide member 4, it is within the scope of the present invention. That is, since the fixed guide member 4 is freely supported around the axis O of the support pins 18, 18, the deflection of the free end portion is reduced, and therefore the cross-sectional area of each part can be reduced, and the welding The torch can be made as compact and lightweight as possible. In this case, in the case where the shielding gas is appropriately introduced into the cylindrical space 34' inside the fixed cylindrical body 114, the contact member 7 tilts in the _Z2 direction as the power supply member 6 wears out. Therefore, 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 present invention can be applied to a so-called side shield type, in which the cylindrical members 113 and 114 are removed and a supply pipe is installed for supplying shielding gas toward the welding part. can. 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 support pin and the support member support the support member in a tiltable manner. Because the fixed guide member is freely supported at the free end by the spherical body that abuts the inner surface of the support pin, the cross-sectional area of each part can be reduced and the overall size can be reduced as much as possible. It is possible to realize a long-life welding torch that is compact and lightweight.

[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 front sectional view showing an embodiment of the present invention, and FIG. Figures to Figures 7 are the - line in Figure 4, respectively.
- line and - line sectional view, Figure 8 is the 7th
FIG. 9, which is an enlarged cross-sectional view taken along the line - in the figure, is a diagram for schematically explaining the main part of FIG. 4. 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...
Support pin, 19... Spherical body, 23... Pressure means,
26...electrode wire.

Claims (1)

[Scope of utility model registration request] A contact member is composed of 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 the free end of a fixed guide member for guiding the electrode wire is connected to the contact member. The power supply connection member inserted inside the member and arranged on the base side of the welding torch and the supporting member of the contact member are connected by a flexible connecting member, and the A fixed cylindrical body is provided that covers the flexible connecting member and the base side of the contact member, and the contact member is held on a plane including the axis of the electrode wire by opposing support pins arranged on the cylindrical body. The contact member is supported tiltably and restrained in a direction substantially perpendicular to the plane, and is provided with a pressurizing means for biasing the contact member toward the electrode wire with the support pin as a rotation center. A welding torch, the welding torch comprising: a spherical body that abuts the inner surface of the support member at a position substantially orthogonal to the opposing support pins; the fixed guide member is provided with a spherical body.