JP7000711B2 - Conduit cables and welders - Google Patents

Description

The present invention relates to a conduit cable that feeds a welding wire to a welding torch, and a welding machine provided with the conduit cable.

When welding metals to each other, a filler metal may be supplied to the joint.

In an automatic welding machine for joining pipes and the like, a welding torch rotates around an object to perform welding. When feeding the filler metal in such an automatic welding machine, it is necessary to feed the welding wire as the filler metal so as to follow the tip of the welding torch in accordance with the rotation of the welding torch. In this type of automatic welding machine, a welding wire is passed through a pipe called a conduit cable, a conduit tube, or the like, and the conduit cable is made to follow the movement of the welding torch while welding from the conduit cable to the tip of the welding torch. Wires are being fed.

Prior art documents related to the conduit cable include, for example, the following Patent Document 1 and the like.

Japanese Unexamined Patent Publication No. 2002-39447

The conduit cable as described above needs to be flexible enough to follow the welding torch. That is, at the same time that the welding torch rotates around the object, the conduit cable moves so as to wrap around the object. Therefore, the conduit cable is required to have sufficient flexibility to wrap around the object. ..

On the other hand, in the conduit cable, since the welding wire passed through the inside is sequentially sent out, it is desirable to reduce the frictional force with the welding wire as much as possible. This is because the frictional force between the conduit cable and the weld wire can be a resistance in feeding the weld wire. In particular, when the space around the object is narrow, the conduit cable winds around the object at a steep angle, and the conduit cable bends significantly, so that it is between the conduit cable and the welding wire passing through the inside. Contact tends to occur, and the frictional force associated with the contact tends to increase.

As described above, the conduit cable provided in the welding machine is required to have both flexibility and low friction. However, in the conventional conduit cable, if a highly flexible material is used, the friction with the welded wire increases, while the material having a small coefficient of friction is hard and difficult to bend, which is a dilemma. That is, there is a limit to the flexibility that can be realized in the conduit cable within the range in which the welded wire can be fed smoothly. Therefore, when the space around the object is narrow, such as when multiple pipes as the object are densely arranged, there is sufficient space for the conduit cable to follow the welding torch and wrap around the object. The fact is that welding with an automatic welding machine is difficult because it cannot be secured.

In view of such circumstances, the present invention is intended to provide a conduit cable and a welding machine capable of reasonably feeding a welding wire to a welding torch while appropriately following the conduit cable to the welding torch.

The present invention is configured as an outer skin tube made of a flexible and insulating material having a thickness of 0.3 mm or more and 1 mm or less, and a close contact coil spring having an outer diameter set smaller than the inner diameter of the outer skin tube. The inner sheath tube, which is housed in the outer skin tube and through which the welding wire is passed , communicates with the tubular tip tip installed at the tip of the outer skin tube, and the tip tip and the outer skin tube are communicated with each other. It is provided with a mounting tube that non-fixedly seals the sheath tube inward in the axial direction from the tip of the outer skin tube, and the mounting tube is mounted so as to be inserted into the tip of the tip with respect to the tip of the tip. It is related to the conduit cable.

In the conduit cable of the present invention, the outlet pipe of the wire supply part that sends the welded wire to the conduit cable is communicated with the base end of the conduit cable, and the inner sheath pipe is axially inside from the base end of the outer skin pipe. Can be equipped with a non-fixed sealing joint.

The conduit cable of the present invention can be used for welding in a method that does not require energization of the welding wire.

Further, the present invention relates to a welding machine provided with the above-mentioned conduit cable.

According to the conduit cable and the welding machine of the present invention, it is possible to obtain an excellent effect that the welding wire can be reasonably fed to the welding torch while the conduit cable is suitably followed to the welding torch.

It is a front view which shows an example of the form of the welding machine by carrying out this invention. It is a bottom view which shows an example of the form of the welding machine by carrying out this invention. It is sectional drawing which shows an example of the form of the tip part of the conduit cable by carrying out this invention. It is sectional drawing which shows an example of the form of the base end portion of the conduit cable by carrying out this invention. It is a bottom view explaining the operation of the welding machine by carrying out this invention, (A) shows the initial state, (B) shows the state immediately after welding. It is sectional drawing which shows one state during feeding of the welding wire of the conduit cable by carrying out this invention.

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

1 to 4 show an example of a conduit cable and a welding machine according to the implementation of the present invention. As shown in FIG. 1, the welding machine 1 of the present embodiment includes a welding torch 2 and drives a head portion 4 including the welding torch 2 to orbit the welding torch 2 around an object 3. It is provided with a main body 5 having a built-in control mechanism. Hereinafter, in the present embodiment, the case where the lower end of the object 3 such as a cylindrical pipe or tube extending in the vertical direction is welded to the horizontal plane by fillet welding will be described. However, the arrangement of the object 3 and the welding machine 1 is not limited to this, and the direction of the object 3 may be, for example, a horizontal direction or an oblique direction. In addition to fillet welding, it can also be applied to butt welding and the like.

The main body portion 5 is placed on a horizontal plane and supports the head portion 4 at an appropriate position with respect to the object 3. The main body 5 is provided with a drive mechanism (not shown) for moving the head 4 in a direction along the axis of the object 3 or in a direction orthogonal to the axis of the object 3, thereby targeting the position of the head 4. It is possible to make fine adjustments to the object 3. Since the case where the object 3 is fillet welded to the horizontal plane is described here, if the main body 5 is placed on the horizontal plane, the entire welding machine 1 is arranged at an appropriate position with respect to the object 3. However, in addition to this, for example, assuming the case where the object 3 is welded to the vertical surface or the pipes as the object 3 are welded by butt welding, for example, a clamp that sandwiches the pipe or tube, etc. , A mechanism for fixing the main body 5 as appropriate may be provided separately.

The head portion 4 is rotatable about a table 6 as a pedestal portion that forms a surface orthogonal to the object 3 and is supported by the main body portion 5, and an axis along the direction of the object 3 with respect to the table 6. A ring-shaped rotating body (rotating ring) 7 supported by the ring-shaped rotating body (rotating ring) 7 is provided. A welding torch 2 is attached to the rotating ring 7 so as to rotate around the object 3 together with the welding torch 2 during welding. The welding torch 2 includes a tip portion 2a that discharges an object 3, and a support portion 2b that supports the tip portion 2a so as to be tiltable and supports the entire welding torch 2 with respect to the rotating ring 7.

The rotating ring 7 is rotatably supported with respect to the table 6 by, for example, a turntable-like mechanism configured of an insulator. However, this mechanism is not directly related to the gist of the present invention, and if it is shown, the whole figure becomes complicated, so that the figure is omitted in all the figures.

As shown in FIG. 2, the surface formed by the table 6 constituting the head portion 4 is provided with a recess 6a for sandwiching the object 3, and the rotating ring 7 is arranged in the recess 6a. Further, the rotating ring 7 is an annular member having a notch 7a in a part thereof, and is formed in a C shape as a whole in a plan view. Then, the rotating ring 7 can be arranged around the object 3 by passing the object 3 through the notch 7a. A welding torch 2 is attached to the lower surface of the rotating ring 7 at a position opposite to the notch 7a in the circumferential direction of the rotating ring 7. The tip of the welding torch 2 is configured so that the angle can be appropriately changed by a drive mechanism (not shown).

The rotary ring 7 is rotatably attached to the lower surface of the table 6 as a pedestal portion that supports the rotary ring 7 with respect to the table 6, and the rotation is driven by a plurality of gears provided in the head portion 4. It has become so.

In the welding torch 2 attached to the rotating ring 7, two power cooling cables 8, a power gas cable 9, a control cable 10, and a conduit cable 11 are arranged at the tips of a total of five pipes. Of these five pipes, two power cooling cables 8, a power gas cable 9, and a control cable 10 are connected to the support portion 2b of the welding torch 2, and the tip of the conduit cable 11 is the tip of the welding torch 2. It is fixed to 2a. The two power cooling cables 8 are cables that supply or recover water as a coolant while supplying electric power to the welding torch 2. The power gas cable 9 is a cable that supplies electric power to the welding torch 2 and supplies a shield gas for protecting the molten metal. The control cable 10 is a communication cable for inputting a control signal for controlling the operation of the welding torch 2. The conduit cable 11 is a cable that feeds the welding wire 12 as a fillering material, which will be described later, to the tip of the welding torch 2. The cables constituting these five pipes are collectively sandwiched by a pair of guide rollers 13 provided in the main body 5, and the rotation of the guide rollers 13 causes the required amount of welding according to the movement of the welding torch 2. It is sent out to the torch 2 and pulled back from the welding torch 2.

The welding machine 1 of this embodiment has a main feature in the configuration of the conduit cable 11.

3 and 4 show the structure of the conduit cable 11. The conduit cable 11 of this embodiment is configured by accommodating the inner sheath tube 15 which is a close contact coil spring inside the outer skin tube 14. The welding wire 12 is fed to the welding torch 2 (see FIGS. 1 and 2) through the inside of the inner sheath pipe 15.

The outer skin tube 14 can be made of a material having flexibility and insulating properties that can be easily bent, and for example, fluororesin or the like is suitable. The thickness of the outer skin tube 14 is preferably about 1 mm at the maximum in consideration of the followability to the welding torch 2 (see FIGS. 1 and 2). Further, in order to secure insulation and durability, it is preferable to have a thickness of about 0.3 mm or more.

In addition, as the outer skin tube 14, various materials are adopted as long as they have an appropriate flexibility that can follow the welding torch 2 and an insulating property that can cut off the electricity sent to the welding torch 2. Can be. For example, the outer skin tube 14 may be a laminated tube in which a material such as a resin or a metal foil is laminated. Further, the outer skin tube 14 can also be configured as a spiral tube in which a resin or a laminated sheet formed into a tape shape is spirally wound.

The inner sheath tube 15 is configured as a close-contact coil spring in which a metal wire is spirally wound without a gap. The inner sheath tube 15 which is a close contact coil spring can be freely bent in a direction orthogonal to the axis, and can be expanded by receiving a tensile force in the axial direction and can be contracted by receiving a compressive force. Further, deformation such as bending in the direction orthogonal to the axis and expansion / contraction in the axial direction is restored by the repulsive force of the inner sheath tube 15 itself when the external force is not applied.

The outer diameter of the inner sheath tube 15 is set smaller than the inner diameter of the outer sheath tube 14 so that the inner sheath tube 15 can be freely deformed or moved inside the outer skin tube 14. Specifically, the outer diameter of the inner sheath tube 15 is preferably smaller than the inner diameter of the outer skin tube 14 by 0.5 mm or more.

As shown in FIG. 3, a tip tip 16 as an outlet structure of the welding wire 12 is attached to the tip of the conduit cable 11. The tip tip 16 is a tubular metal component having a tapered portion 16b formed at the tip of a cylindrical main body portion 16a. It is also possible to provide the tapered portion 16b over the entire axial direction of the tip tip 16, that is, for example, the entire tip tip 16 may be formed in a conical shape whose diameter is reduced toward the tip, but it relates to feeding out the welding wire 12. From the viewpoint of reducing resistance as much as possible, it is more preferable that the main body portion 16a has a cylindrical shape and the tapered portion 16b is formed only at the tip portion of the main body portion 16a. Inside the conduit cable 11, when the welding wire 12 hits a portion whose diameter is reduced toward the tip, a resistance force to the feeding of the welding wire 12 may be generated. Therefore, by reducing the range of the tapered portion 16b as much as possible, the resistance You can reduce the chances of power generation.

The base end portion of the main body portion 16a of the tip tip 16 and the tip end portion of the outer skin tube 14 are connected by a mounting tube 17. The mounting tube 17 is a straight tubular component whose both ends are inserted into the inside of the main body portion 16a of the tip tip 16 and the inside of the outer skin tube 14, respectively, and the tip tip 16 and the outer skin tube 14 are connected to each other via the mounting tube 17. Communicate. One end of the mounting tube 17 is fixed to the tip tip 16 by a set screw 18 as a fastener that radially penetrates the tip tip 16 and the mounting tube 17. The other end of the mounting tube 17 is fixed to the outer skin tube 14 so that the outside of the insertion position of the mounting tube 17 in the outer skin tube 14 is bound by the band 19 as a fixing tool. The method of fixing between the tip tip 16 and the mounting tube 17 and the method of fixing between the mounting tube 17 and the outer skin tube 14 are not limited to the examples shown here. For example, the tip tip 16 and the mounting tube 17 can be fixed to each other by welding, or a spiral pitch is formed on the inner surface of the tip tip 16 and the outer surface of the mounting tube 17, respectively, with respect to the tip tip 16. It may be fixed by screwing the mounting pipe 17. Further, the mounting tube 17 and the outer skin tube 14 may be bound by a wire or the like, or may be fixed by a pipe clamp or the like.

The inner diameter of the mounting tube 17 is set to be smaller than the outer diameter of the inner sheath tube 15. The inner sheath tube 15 housed in the outer skin tube 14 is not fixed to the outer skin tube 14, the tip tip 16, or the mounting tube 17, but is connected to the outer skin tube 14 by the mounting tube 17 fitted to the tip of the outer skin tube 14. It is sealed at a position inside the axial direction from the tip of the outer skin tube 14 so as not to protrude.

Further, it is desirable that the inner diameter of the mounting pipe 17 is set to be equal to or larger than the inner diameter of the inner sheath pipe 15. This is to prevent the welding wire 12 sent through the inner sheath pipe 15 from being caught on the edge of the mounting pipe 17. Further, it is desirable that the mounting tube 17 is attached to the tip 16 so as to be inserted inside the tip 16. This is to prevent the welding wire 12 sent through the inner sheath tube 15 from being caught on the edge of the tip tip 16.

As shown in FIG. 4, the outlet pipe 22 of the wire supply unit 21 is connected to the base end side of the conduit cable 11 via the joint 20. The joint 20 is a general straight tubular joint used for connecting pipes to each other, and by connecting the outer skin pipe 14 and the outlet pipe 22 to both ends, the outer skin pipe 14 and the outlet pipe 22 can communicate with each other. It has become. The wire supply unit 21 can send the welded wire 12 into the conduit cable 11 through the joint 20 from the outlet pipe 22.

An insertion port 20a into which the outer skin tube 14 can be inserted is opened on one end side of the joint 20. At the back of the insertion port 20a, a step portion 20b provided so as to project from the inner wall of the insertion port 20a is provided. Further, a ring-shaped fixing claw 20c is fitted along the insertion port 20a at a position on the front side of the step portion 20b in the insertion port 20a. The inner diameter of the insertion port 20a is substantially the same as the outer diameter of the outer skin tube 14, and the inner diameter of the fixing claw 20c before insertion of the outer skin tube 14 is set to be slightly smaller than the outer diameter of the outer skin tube 14. Then, when the base end portion of the outer skin tube 14 is inserted until it hits the step portion 20b at the back of the insertion port 20a, the fixing claw 20c is penetrated by the outer skin tube 14 while expanding its diameter, and the outer skin tube 14 is tightened from the outside by the repulsive force. It has become like. In this way, the outer skin tube 14 can be fixed to the joint 20 by inserting the base end portion of the outer skin tube 14 into the insertion port 20a until it abuts on the step portion 20b.

The inner diameter of the step portion 20b is set to be smaller than the outer diameter of the inner sheath tube 15 housed in the outer skin tube 14. The inner sheath tube 15 housed in the outer skin tube 14 is not fixed to the outer skin tube 14 or the joint 20, but the outer skin tube is prevented from protruding from the outer skin tube 14 by the joint 20 installed at the base end of the outer skin tube 14. It is sealed at a position inside the axial direction from the base end of 14.

The other end side of the joint 20 is provided with an insertion port 20a, a step portion 20b, and a fixing claw 20c similar to those on the one end side, whereby the outer skin tube 14 is fixed to the one end side in the same procedure. The outlet pipe 22 can be fixed to the other end side.

In this way, the welding wire 12 sent out from the outlet pipe 22 of the wire supply unit 21 enters the conduit cable 11 through the joint 20, passes through the inside of the inner sheath pipe 15, and is sent out from the tip tip 16. ..

Next, the operation of the above-described embodiment will be described.

When welding the object 3 with the welding machine 1, first, as shown in FIG. 5A, the welding machine 1 so that the recess 6a of the table 6 and the rotating ring 7 are located so as to surround the object 3. To place. At this time, the rotary ring 7 is at the initial position where the position of the notch 7a coincides with the opening of the recess 6a, and by passing the object 3 through the recess 6a and the notch 7a, the welding machine 1 is placed at an appropriate position for welding. Can be placed in. After arranging the welding machine 1, the head portion 4 is appropriately operated by a drive mechanism (not shown) to position the rotating ring 7 and the welding torch 2 with respect to the welded portion of the object 3. At this time, the angle of the tip portion 2a of the welding torch 2 is also operated to adjust so that the discharge portion at the tip is located at the welded portion of the object 3 (see FIG. 1).

From this state, the object 3 is welded. Water and shield gas are supplied to the welding torch 2 together with electric power from the power cooling cable 8 and the power gas cable 9, and the welding wire 12 is sent out from the conduit cable 11 from the arrangement shown in FIG. 5 (A). Is rotated 360 °. During this time, the power cooling cable 8, the power gas cable 9, and the conduit cable 11 follow the welding torch 2 and move so as to wind around the object 3 (see FIG. 5B).

When the welding is completed, the rotating ring 7 is rotated 360 ° in the direction opposite to that during welding, and is returned to the initial position shown in FIG. 5 (A) again. This completes the welding process.

As described above, in the above-mentioned series of steps, the conduit cable 11 follows the welding torch 2 on the rotating ring 7 side and moves so as to wrap around the object 3. Here, the outer skin tube 14 having a maximum thickness of 1 mm constituting the conduit cable 11 has flexibility that can be easily bent. Further, the inner sheath tube 15 which is a close contact coil spring housed in the outer skin tube 14 can be freely deformed in a direction orthogonal to the axis. Therefore, the entire conduit cable 11 can be freely and easily greatly deformed, and when it winds around the object 3 with the operation of the welding torch 2, it can be bent without difficulty even at a steep angle. Moreover, since the inner sheath tube 15 which is a close contact coil spring has a restoring force against deformation, when the conduit cable 11 wound around the object 3 returns to its original state (from the state shown in FIG. 5 (B) to FIG. 5 (A). ), The shape of the entire conduit cable 11 is naturally restored only by following the welding torch 2.

Further, since the inner sheath tube 15 in contact with the welding wire 12 in the conduit cable 11 is made of metal, the friction generated between the conduit cable 11 and the welding wire 12 is small. Therefore, for example, as shown in FIG. 6, even if the welding wire 12 comes into strong contact with the inner surface of the inner sheath tube 15 as a result of the conduit cable 11 being greatly bent, the friction acting as a resistance when the welding wire 12 is sent out. The force is small. That is, the welding wire 12 can be maintained to be fed out by sliding the welding wire 12 with respect to the inner surface of the inner sheath tube 15.

Moreover, since the inner sheath tube 15 is a close contact coil spring wound without a gap, even if the inner sheath tube 15 comes into contact with the welding wire 12, the number of contact points between the inner sheath tubes 15 is large, and the frictional force generated at each point is large. Is even smaller.

Further, the fact that the inner sheath tube 15 is a close-contact coil spring also has an effect of suppressing local elongation due to catching of the welding wire 12. The metal wire constituting the close contact coil spring has a shape adjacent to another metal wire for each winding. Therefore, even if a hook is generated between the inner sheath tube 15 and the welding wire 12 at one point and the welding wire 12 tries to move toward the tip side while hooking the metal wire at the one point, the metal wire Immediately after, the movement of the metal wire is received by another adjacent metal wire, which hinders the further movement of the one-point metal wire. Therefore, although the welding wire 12 may catch one point of the metal wire constituting the inner sheath tube 15, it does not move significantly in the conduit cable 11 as it is, and immediately slides on the inner surface of the inner sheath tube 15. It will be sent in the conduit cable 11 instead of the movement.

However, when the conduit cable 11 is greatly bent as shown in FIG. 6, the space between the windings of the metal wires constituting the inner sheath tube 15 is opened in the portion corresponding to the outside of the bending, and therefore the welding wire 12 is formed in this gap. It is conceivable that the conduit may be bent and partially penetrated, resulting in catching with the metal wire. However, even in this case, since the inner sheath tube 15 is originally a close contact coil spring, the gap generated between the windings of the metal wires does not become large. Therefore, the welding wire 12 strongly contacts the inner sheath tube 15 at a certain point (illustrated as a contact point P in FIG. 6), and moves in the conduit cable 11 with a metal wire corresponding to the position of the contact point P. Even so, the metal wire at the position of the contact point P also immediately contacts another adjacent metal wire, and further movement of the metal wire at the position of the contact point P is hindered.

Further, when the metal wire corresponding to the position of the contact point P and the other metal wire are in contact with each other and the welding wire 12 tries to move with the metal wire corresponding to the position of the contact point P, the contact point An axially compressive force is applied between the metal wire at the position of P and the other metal wire. Since the force that compresses the close contact coil spring in the axial direction acts to expand the diameter of the close contact coil spring, the diameter of the inner sheath tube 15 expands at the point where the welding wire 12 tends to move, whereby the welding wire 12 expands. It can be expected that the hooking between the wire and the inner sheath tube 15 can be easily eliminated.

At this time, as described above, since a certain amount of gap is provided between the outer surface of the inner sheath tube 15 and the inner surface of the outer skin tube 14, the inner sheath tube 15 is easily expanded by receiving the compressive force in the axial direction. Can be diameter. Further, if the gap is provided, even if the inner sheath tube 15 is partially expanded in diameter, the inner sheath tube 15 strongly contacts the outer skin tube 14 and is between the inner sheath tube 15 and the outer skin tube 14. There is no repulsive force. Therefore, a strong frictional force is generated between the inner sheath tube 15 and the outer sheath tube 14, the inner sheath tube 15 is restrained with respect to the outer sheath tube 14, and the welding wire 12 is caught by the inner sheath tube 15 to form the welding wire 12. Situations such as difficulty in sending are prevented.

Further, when a situation occurs in which a part of the welding wire 12 moves forward with a metal wire corresponding to the position of the contact point P, the portion of the inner sheath pipe 15 on the rear side from the contact point P is also pulled forward. become. At this time, if some part of the inner sheath tube 15 that is behind the contact point P is fixed or restrained to the outer skin tube 14 or the joint 20, the restrained part and the contact point P. The inner sheath tube 15 will extend between and. If the inner sheath tube 15 which is a close contact coil spring is stretched, a force corresponding to the spring constant acts as a resistance force against the feeding of the weld wire 12. Further, if the elongation of the inner sheath tube 15 becomes significantly large, the inner sheath tube 15 whose diameter is greatly reduced by the amount of extension may tighten the welding wire 12, which may lead to a further increase in resistance.

However, in the conduit cable 11 of this embodiment, a gap is set between the inner sheath tube 15 and the outer skin tube 14 as described above, and a large frictional force is generated between the outer surface of the inner sheath tube 15 and the inner surface of the outer skin tube 14. It is designed not to occur. Further, the base end portion of the inner sheath tube 15 is not fixed to the outer skin tube 14 or the joint 20. Therefore, if the contact point P on the inner surface of the inner sheath tube 15 is pulled forward by the welding wire 12, the portion corresponding to the rear side from the contact point P moves forward inside the outer skin tube 14 without receiving a particularly large resistance. It will be. In such a state, the inner sheath tube 15 is not significantly extended between the base end portion and the contact point P, and the resistance force of the weld wire 12 to the feeding is not increased. Further, a situation such as tightening of the welding wire 12 due to the reduced diameter of the inner sheath pipe 15 is prevented.

Similarly, in the conduit cable 11 of the present embodiment, the tip of the inner sheath tube 15 is not fixed to the outer skin tube 14, the mounting tube 17, or the tip tip 16. When feeding the welding wire 12, depending on how the welding wire 12 is bent in the conduit cable 11, the welding wire 12 is partially pulled back backward while hooking a part of the inner sheath pipe 15, that is, from the tip side. It may happen that the wire moves toward the base end side. Even in such a case, as a result of the tip of the inner sheath tube 15 being non-fixed as described above, it is possible to prevent the inner sheath tube 15 from being greatly extended between the contact point with the welding wire 12 and the tip. Therefore, the generation of resistance force related to the feeding of the welding wire 12 is suppressed.

As described above, in the conduit cable 11 of the present invention, the outer diameter of the inner sheath tube 15 is set smaller than the inner diameter of the outer skin tube 14, and a gap is provided between the inner sheath tube 15 and the outer skin tube 14. By sealing both ends of the inner sheath pipe 15 in a non-fixed manner by the mounting pipe 17 and the joint 20, the inner sheath pipe 15 is held with a degree of freedom in both the radial direction and the axial direction. By doing so, the inner sheath tube 15 can freely move or deform in a certain space inside the outer skin tube 14, and the generation of resistance to the feeding of the welding wire 12 can be reduced.

The conduit cable 11 as described above, or the welding machine 1 provided with the conduit cable 11, is used as a filler material as in non-consumable electrode type arc welding such as TIG welding and plasma welding, and laser welding using a welding wire. It is particularly useful for welding of a method in which a welding wire is fed and the welding wire is not required to be energized. When the welding wire is energized as in arc welding of the consumable electrode type, it is necessary to dispose a conductor on a member constituting the outside of the conduit cable, for example, as in the conduit cable described in Patent Document 1. be. In this case, if the thickness of the conductor is increased in order to secure the amount of electricity supplied to the welding wire, the flexibility of the conduit cable may be impaired. Therefore, when the conduit cable of the present invention is applied to the consumable electrode type welding, the amount of electricity supplied to the welding wire cannot be increased so much.

As described above, the conduit cable 11 of the present embodiment has an outer skin tube 14 made of a flexible and insulating material having a thickness of 0.3 mm or more and 1 mm or less, and an outer diameter larger than the inner diameter of the outer skin tube 14. The entire conduit cable 11 is freely and easily enlarged because it is configured as a close contact coil spring in which the size is set small, and is provided with an inner sheath tube 15 which is accommodated in the outer skin tube 14 and through which a welding wire 12 is passed inside. It can be deformed, and when it winds around the object 3 with the operation of the welding torch 2, it can bend without difficulty even at a steep angle. On the other hand, in the inner sheath tube 15 in contact with the welding wire 12, the friction generated between the inner sheath tube 15 and the welding wire 12 is small, and even if the welding wire 12 comes into strong contact with the inner surface of the inner sheath tube 15, the welding wire 12 is sent out. Can be maintained. Further, since the inner sheath tube 15 is a close contact coil spring, it is possible to suppress local elongation due to catching of the welding wire 12.

Further, in the conduit cable 11 of the present embodiment, the tubular tip 16 installed at the tip of the outer skin tube 14 communicates with the tip tip 16 and the outer skin tube 14, and the inner sheath tube 15 is connected to the inner sheath tube 15. Since it is provided with a mounting pipe 17 that seals inwardly in the axial direction from the tip of the outer skin pipe 14, the inner sheath pipe 15 is greatly extended between the contact point with the welding wire 12 and the tip portion. This can be prevented and the generation of resistance force related to the feeding of the welding wire 12 can be suppressed.

Further, in the conduit cable 11 of the present embodiment, the outlet pipe 22 of the wire supply unit 21 that sends the welded wire 12 to the conduit cable 11 and the base end of the conduit cable 11 are communicated with each other, and the inner sheath pipe 15 is provided. Since the joint 20 is provided inwardly in the axial direction from the base end of the outer skin pipe 14 in a non-fixed manner, the inner sheath pipe 15 is greatly extended between the contact point with the welding wire 12 and the base end portion. It is possible to prevent the generation of resistance force related to the feeding of the welding wire 12.

Therefore, according to the present embodiment, the welding wire can be reasonably fed to the welding torch while the conduit cable is suitably followed to the welding torch.

It should be noted that the conduit cable and the welding machine of the present invention are not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

1 Welding machine 11 Conduit cable 12 Welding wire 14 Outer skin pipe 15 Inner sheath pipe 16 Tip tip 17 Mounting pipe 20 Fitting 21 Wire supply part 22 Outlet pipe

Claims (4)

An outer skin tube made of a flexible and insulating material with a thickness of 0.3 mm or more and 1 mm or less,
An inner sheath tube configured as a close contact coil spring whose outer diameter is set smaller than the inner diameter of the outer skin tube, and which is housed in the outer skin tube and through which a welding wire is passed inside .
A tubular tip tip installed at the tip of the outer skin tube and
The tip tip and the outer skin tube are communicated with each other, and the inner sheath tube is provided with a mounting tube that seals the inner sheath tube from the tip of the outer skin tube inward in the axial direction in a non-fixed manner.
The attachment tube is a conduit cable characterized in that it is attached to the tip of the tip so as to be inserted inside the tip of the tip . A joint that connects the outlet pipe of the wire supply section that sends the welded wire to the conduit cable and the base end of the conduit cable, and seals the inner sheath pipe from the base end of the outer skin pipe inward in the axial direction without fixing. The conduit cable according to claim 1 . The conduit cable according to claim 1 or 2 , which is used for welding in a method that does not require energization of the welding wire. A welding machine provided with the conduit cable according to any one of claims 1 to 3 .

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