JP5109906B2 - Wire feeding tube, wire feeding device, and arc welding device - Google Patents

Description

  The present invention relates to a wire feeding tube, a wire feeding device, and an arc welding device, and more particularly to a technique for feeding a wire in arc welding or the like.

Conventionally, a technique for smoothly feeding a wire when feeding the wire in an arc welding apparatus or the like has been proposed (for example, Patent Literature 1 and Patent Literature 2).
About the said prior art, for example, in Patent Document 1, a guide tube having a concave and convex inner surface is provided in a conduit of a wire feeding device, and the contact force between the wire and the guide tube is reduced, thereby acting on the wire. A technique for reducing the size is disclosed.
Patent Document 2 discloses a technique for forming a guide member of a welding apparatus by arranging a plurality of linear members in a coaxial direction and simultaneously winding them in a spiral shape.
Japanese Utility Model Publication No. 61-102375 Japanese Utility Model Publication No. 6-571

  In the prior art, for example, in the case of the technique described in Patent Document 1, there is a problem in that the flexibility of the feeding path and the degree of freedom in handling are reduced due to the influence of the rigidity of the guide tube. In addition, compared with a fixed type welding machine, a welding machine used by being attached to a robot arm particularly requires a degree of freedom in handling, and thus the above-described problems in the prior art are remarkable.

On the other hand, in the case of the technique described in Patent Document 2, when performing arc welding by passing a wire through the guide member, the guide member is worn by the wire to generate wire wrinkles. To deposit. As a result, since the guide member inner diameter is reduced, the frictional resistance between the wire and the guide member inner wall is increased, and there is a problem that the feeding of the wire becomes unstable.
Furthermore, the wire feeding becomes unstable, so that there is a possibility that the weld bead is poor and the weld quality is deteriorated. In addition, since the guide member is worn by the wire and its life is short, the cost is increased.

  Therefore, in the present invention, in view of the above-described situation, the feeding resistance can be suppressed low by suppressing the occurrence of wire wrinkles while securing the flexibility of the feeding path and the handling, and the construction is inexpensive and simple. The present invention provides a wire feeding tube, a wire feeding device, and an arc welding device capable of stably feeding a wire over a long period of time.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, according to the first aspect of the present invention, the wire inserted through the flexible tube and the wire inserted into the tube at a predetermined interval at a predetermined interval in close contact with the inner surface of the tube. Each of the guide members has a communication hole that is smaller in diameter than the inner diameter of the tube and through which the wire can be inserted, and is open toward the axial center of the tube. By inserting the wire into the communication hole, the wire can be fed through the tube. At least one end of the tube has a communication hole through which the wire can be inserted in the axial direction of the tube. A tube tip guide member that is open toward the tube is inserted, and the tube tip guide member has a flange-like shape at the end portion on the tip end side of the tube. Stopper is formed with a communication hole of the tube tip guide member has a conical shape whose diameter increases toward the midway portion to the end side.

  According to a second aspect of the present invention, the guide member is made of reinforced plastic.

  According to a third aspect of the present invention, the communication hole opened in the guide member has a mortar shape that increases in diameter from an intermediate portion toward the end portion.

In Claim 4, it is equipped with a feeding motor and the wire feeding tube of any one of Claims 1-4, The said wire feeds the inside of the said wire feeding tube with the said feeding motor. It will be sent.

In Claim 5, the wire feeding apparatus of Claim 5 is arrange | positioned between the wire drum in which the said wire was wound so that drawing | extracting was possible, and the welding robot which welds using the said wire. Is.

  As effects of the present invention, the following effects can be obtained.

  According to the present invention, at the time of wire feeding in an arc welding apparatus or the like, it is possible to keep the feeding resistance low by suppressing the generation of wire wrinkles while ensuring the flexibility of the feeding path and the freedom of handling. And with a simple structure, a wire can be stably fed over a long period of time.

Next, embodiments of the invention will be described.
FIG. 1 is a perspective view showing a wire feeding tube according to the present invention.
2A is a cross-sectional view showing the insertion portion of the guide member in the wire feeding tube, and FIG. 2B is a cross-sectional view showing the insertion portion of the tube tip guide member.
FIG. 3 is a schematic view showing an arc welding apparatus according to the present invention.
4A is a view showing a connection terminal on the feed motor side of the wire feed tube according to the present invention, and FIG. 4B is a view showing a connection method on the feed motor side in the same manner.
5A is a view showing a connection terminal on the wire drum side of the wire feed tube according to the present invention, and FIG. 5B is a view showing a connection method on the wire drum side.
It should be noted that the technical scope of the present invention is not limited to the following examples, but broadly covers the entire scope of the technical idea that the present invention truly intends, as will be apparent from the matters described in the present specification and drawings. It extends.

[Wire feed tube 10]
First, a wire feeding tube 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the wire feeding tube 10 according to the present invention has a wire W inserted therethrough, a flexible transparent tube 11, and a close contact with the inner surface of the tube 11. The guide member 12 of the wire W that is inserted into a plurality of locations at predetermined intervals and formed in a short cylindrical shape, and the short cylindrical tube tip guide member that is inserted into one end of the tube 11 13.
The guide member 12 and the tube tip guide member 13 have a communication hole through which the wire W can be inserted. By inserting the wire W into the communication hole, the wire 11 is passed through the tube 11. W is configured to be capable of feeding. In the embodiment shown in FIG. 1, the tube tip guide member 13 is disposed only at one end of the tube 11, but it may be configured to be disposed at both ends.

  The tube 11 is formed of, for example, a flexible material such as vinyl synthetic resin, and can be bent and managed according to the shape of the feeding path of the wire W. Moreover, since the tube 11 is a transparent member, when the wire W bends inside the tube 11 or a foreign substance accumulates, it can be visually confirmed and an abnormality can be easily found and dealt with.

  The outer diameter of the guide member 12 and the inner diameter of the tube 11 are formed to be substantially the same. When the guide member 12 is inserted into the tube 11, the guide member 12 is separated by a predetermined interval with, for example, a rod-shaped member. It pushes in multiple places apart. Thereafter, each guide member 12 is fixed to the inner peripheral surface of the tube 11 by a frictional force caused by the contact between the outer surface of the guide member 12 and the inner surface of the tube 11, and the tube 11 is bent as shown in FIG. The tube 11 does not move even if it is deformed. That is, the wire feeding tube 10 can be freely bent or routed depending on the shape of the feeding path of the wire W.

  In addition, the guide member 12 has a communication hole as described above, and the communication hole is formed in the axial direction of the tube 11 with the guide member 12 being inserted into the tube 11. It is formed in a position that includes the heart. As shown in FIG. 2 (a), the communication holes are formed with mortar-shaped inner side surfaces 12a and 12a that expand from the substantially central portion in the axial direction toward both end portions, and each inner side surface 12a. -12a is connected by the hole 12b. Thus, when the wire W is inserted into the wire feeding tube 10 by forming the communication hole of the guide member 12 into a shape that increases in diameter from the substantially central portion in the axial direction toward both ends, The tip of W can be smoothly inserted without being caught by the guide member 12. Even when the tube 11 is bent, the resistance applied to the wire W passing through the guide member 12 can be reduced.

The hole 12b having the smallest diameter in the communication hole of the guide member 12 is formed at a position larger than the wire W and including the shaft center, and the wire W can freely slide. ing.
Further, the hole 12 b is formed to have a smaller diameter than the inner diameter of the wire feeding tube 10 and is disposed at a substantially central position in the cross-sectional shape of the wire feeding tube 10.
Accordingly, the wire W guided by the guide member 12 is guided to the position farthest from the inner peripheral surface of the wire feed tube 10 (that is, the center position of the wire feed tube 10). Even when the wire is bent, it is difficult for the wire W to contact the inner peripheral surface of the wire feeding tube 10 between the guide member 12 and the guide member 12.

The guide member 12 is formed of a reinforced plastic, which is a plastic with increased strength. As the reinforced plastic, for example, fiber reinforced plastic (FRP), acrylic resin, polycarbonate resin, or the like can be used.
Thereby, the guide member 12 is not worn by the wire W, and the generation of wire wrinkles can be prevented. That is, since the wire rod does not accumulate inside the guide member 12 and the inner diameter of the guide member 12 (particularly, the inner diameter of the hole 12b formed to have the smallest diameter) does not decrease, the wire W and the inner wall of the guide member 12 This prevents the frictional resistance from increasing and the feeding of the wire W from becoming unstable.
Furthermore, since the wire W can be stably fed, it is possible to prevent the occurrence of defective weld beads and weld quality, and the guide member 12 is not worn by the wire W. The cost of parts replacement can be reduced.

  In the present embodiment, the predetermined interval between the guide members 12 is set to about 150 mm so that the wire W does not contact the inner peripheral surface of the tube 11 even if the wire feed tube 10 is bent. The predetermined interval may be any length as long as the wire W does not contact the inner peripheral surface of the tube 11 in relation to the inner diameter of the tube 11, the thickness and rigidity of the wire W, the length of the guide member 12, and the like, and is limited to 150 mm. is not.

Further, the tube tip guide member 13 is formed with a flange-like stopper portion 13 a at the end portion on the tip end side of the tube 11 so as to be fixed at the end portion of the tube 11. Further, as shown in FIG. 2B, the tube tip guide member 13 has a communication hole opened at a position including the shaft center in the shaft center direction. The communication hole is formed with a mortar-shaped inner side surface 13b that increases in diameter from the middle portion of the tube tip guide member 13 toward the end opposite to the tip side of the tube 11, and the inner side surface 13b. Is communicated with an inner surface 13d formed on the distal end side of the tube 11 and a hole 13c.
Further, the tube tip guide member 13 is formed of a reinforced plastic as a material similarly to the guide member 12, and is not worn by the wire W, and can prevent the occurrence of wire wrinkles. Further, the tube tip guide member 13 has a hole 13c positioned on the tip end side of the tube 11 so that when the wire W comes out of the wire feed tube 10, it is removed from the axial center portion of the wire feed tube 10. Configured to go out.

[Arc welding equipment]
Next, an arc welding apparatus according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 3, the arc welding apparatus includes a feeding motor 30 between a wire drum 50 on which the wire W is wound so that it can be pulled out, and a welding robot 31 that performs welding using the wire W. A wire feeding device including the wire feeding tube 10 is provided and configured.

Specifically, a welding robot 31 including a feeding motor 30, a welding torch 32, and the like is disposed in a welding facility space 40 partitioned by a safety fence 41. One end of the wire feeding tube 10 is fixed to the feeding motor 30 by a fixing member 23, a socket 21 and the like.
Meanwhile, a wire drum 50 in which a wire W is wound and stored outside the welding equipment space 40 and a wire stand 51 are disposed, and the other end of the wire feeding tube 10 is fixed by the fixing member 23 or the like. It is fixed to the wire stand 51.

  Then, the wire W extends from the wire drum 50, is inserted through the wire feed tube 10, and is supplied to the welding robot 31. That is, the wire W is fed to the welding robot 31 by the wire feeding device including the feeding motor 30 and the wire feeding tube 10, and arc welding is performed by the welding torch 32 disposed at the tip of the welding robot 31. It is.

  By configuring as described above, even when arc welding is performed by the welding robot 31, the wire feeding tube 10 according to the present invention can be freely bent and routed, and the degree of freedom of welding work. It is possible to prevent a decrease in the amount.

Next, a method for connecting the wire feeding tube 10 to the feeding motor 30 will be described with reference to FIG.
As shown in FIGS. 4A and 4B, the wire feeding tube 10 is connected to the feeding motor 30 via a socket 21, a connector 22, a fixing member 23, and a nipple 24.

  Specifically, the connector 22 provided with the claw portion 22a and having the male screw portion is screwed into the socket 21 having the female screw portion in the direction of arrow α in FIG. Similarly, the nipple 24 having the male screw portion is screwed into the opposite side of the socket 21 in the direction of the arrow β. Then, the wire feeding tube 10 is inserted into the connector 22 in the same direction in the direction of the arrow γ while passing through the fixing member 23 in which the female thread portion is formed. Then, the fixing member 23 is screwed with the connector 22 in the same direction of the arrow δ, and the fixing member 23 tightens the wire feeding tube 10 via the claw portion 22a as shown in FIG. 4B. The socket 21, the connector 22, the fixing member 23, and the nipple 24 are arranged at the end of the wire feeding tube 10. Then, the wire feed tube 10 is connected to the feed motor 30 by inserting the nipple 24 into the feed motor 30 in the direction of arrow ε in FIG.

  After the wire feeding tube 10 is connected to the feeding motor 30 in this way, the wire W is inserted into the wire feeding tube 10 from the wire drum 50 side by the feeding motor 30. It can be sent. At this time, by positioning the hole 13c on the distal end side of the tube 11 as described above, the wire W exits from the axial center portion when exiting the wire feed tube 10, so that the wire W is brought into the connector 22. It is configured to facilitate insertion.

  And when the feeding motor 30 feeds the wire W, the roller 30a disposed in the feeding motor 30 is rotated in the direction of arrow A in FIG. The movement is performed in the direction B.

Next, a method for connecting the wire feed tube 10 to the wire stand 51 will be described with reference to FIG.
As shown in FIGS. 5A and 5B, the wire feeding tube 10 is connected to the wire stand 51 via the connector 22 and the fixing member 23.

  Specifically, similarly to the connection with the feeding motor 30, the connector 22 provided with the claw portion 22a is screwed into the wire stand 51 in the direction of arrow α in FIG. Then, the wire feeding tube 10 is inserted into the connector 22 in the direction of the arrow β in a state of passing through the fixing member 23. Then, the fixing member 23 is also screwed into the connector 22 in the direction of the arrow γ, and the fixing member 23 tightens the wire feeding tube 10 via the claw portion 22a as shown in FIG. 5B. Thus, the end of the wire feeding tube 10 is connected to the wire stand 51. Thus, after connecting the wire feed tube 10 to the wire stand 51, the wire W is inserted into the wire feed tube 10 from below the wire stand 51.

The perspective view which shows the wire feed tube which concerns on this invention. (A) is sectional drawing which showed the insertion part of the guide member in a wire feeding tube, (b) is sectional drawing which similarly showed the insertion part of the guide member for tube front-end | tips. Schematic which showed the arc welding apparatus which concerns on this invention. (A) is the figure which showed the connection terminal by the side of the feed motor of the wire feed tube which concerns on this invention, (b) is the figure which showed the connection method by the side of the feed motor similarly. (A) is the figure which showed the connection terminal by the side of the wire drum of the wire feed tube which concerns on this invention, (b) is the figure which similarly showed the connection method by the side of a wire drum.

DESCRIPTION OF SYMBOLS 10 Wire feed tube 11 Tube 12 Guide member 13 Guide member for tube tip 30 Feed motor 31 Welding robot 50 Wire drum W Wire

Claims (5)

A tube through which the wire is inserted and having flexibility;
In a state of being in close contact with the inner surface of the tube, a wire guide member inserted at a predetermined interval at a plurality of locations in the tube, and
In each guide member, a communication hole through which the wire can be inserted with a smaller diameter than the inner diameter of the tube is opened toward the axial center direction of the tube,
By inserting a wire through the communication hole of each guide member, the wire can be fed through the tube .
At least one end portion of the tube is inserted with a tube tip guide member in which a communication hole through which a wire can be inserted is opened toward the axial center direction of the tube,
A flange-shaped stopper is formed at the distal end side end of the tube in the tube distal end guide member,
The communication hole of the tube tip guide member has a mortar shape that expands from the middle part toward the end part side,
A wire feeding tube characterized by that. The guide member is made of reinforced plastic,
The wire feeding tube according to claim 1, wherein The communication hole opened in the guide member has a mortar shape that increases in diameter from the middle part toward the end part side,
The wire feed tube according to claim 1 or 2, characterized by the above. A feeding motor;
A wire feeding tube according to any one of claims 1 to 3,
The wire is fed through the wire feed tube by the feed motor;
A wire feeding device characterized by that. A wire drum on which the wire is wound so as to be drawable;
Between a welding robot that performs welding using the wire,
The wire feeding device according to claim 4 is disposed.
An arc welding apparatus characterized by that.

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