JP2022057238A - Contact tip fitting device - Google Patents

Abstract

To provide a contact tip fitting device capable of performing automatic contact tip fitting work even on an arc welding torch in which an electric power supply stabilization structure for pressing a wire against the inside of a contact tip is arranged inside the torch.SOLUTION: A contact tip fitting device includes a rotary body 4 for rotating a contact tip 12 around a central axis C3 of the contact tip 12 with the contact tip 12 set from the tip side. A guide ring 7 is disposed on a proximal end side of the contact tip 12 set in the rotary body 4, and the guide ring 7 guides a second body 16 of a torch body 11 to the contact tip 12 while moving the second body 16 so that a center line C4 of the second body 16 of the torch body coincides with the central axis C3 of the contact tip 12 from a position where one end side of a guide cylinder 15 enters the inside of the contact tip 12 on the proximal end side. A movement regulation unit 8 regulates movement of a first body 14 to the side to which a guide cylinder 15 has been shifted by a first coil spring 17 when the guide ring 7 guides the second body 16.SELECTED DRAWING: Figure 3

Description

The present invention relates to a contact tip mounting device that mounts a contact tip to the tip of a welding torch for arc welding mounted on an industrial robot or an automatic machine.

Conventionally, in order to efficiently replace a contact tip screwed and connected to the tip of a welding torch for arc welding, a replacement device for automatically replacing the contact tip has been known.

For example, the exchange device of Patent Document 1 includes a rotating body that rotates a contact tip set in a posture in which the tip side faces downward around the central axis of the contact tip, and above the rotating body, a torch of a welding torch. A guide ring is provided to allow the main body to pass from above. The guide ring is designed to align the center line of the torch body with the central axis of the contact tip while guiding the torch body to the contact tip set on the rotating body, and the torch body guided by the guide ring. By bringing the tip of the contact tip into contact with the base end side of the contact tip rotated by the rotating body, the base end portion of the contact tip is screwed into the tip of the torch body so that the contact tip can be attached to the torch body. ..

Japanese Unexamined Patent Publication No. 11-347731

By the way, in recent years, in order to stabilize the quality of the welded portion when performing arc welding, the wire is strongly pressed against the inner peripheral surface of the guide hole for guiding the wire inside the contact tip, and the wire is guided to the guide hole. Welding torches that prevent variations in the contact state with the inner peripheral surface of the guide hole are generally known. This arc welding torch has a first body having a center line that coincides with the center line of the guide cylinder that guides the wire, and a rotation axis around the center of the rotation axis whose midway portion is orthogonal to the center line of the first body. It is rotatably supported by a second body, and one end side of the guide cylinder is provided with a second body that passes through the inside. It can be mounted by rotating it relatively around the central axis. Inside the first body, an urging member is provided to urge the base end side of the second body to rotate the second body around the center of the rotation axis, and the second body has a rotation axis. By rotating around the center, the guide tube is displaced from the center line of the second body so that the wire is always in contact with the inner peripheral surface of the guide hole of the contact tip attached to the tip of the second body. It stabilizes the power supply state to the wire guided to the guide hole of the contact tip and stabilizes the quality of the welded portion at the time of arc welding.

However, when the contact tip is to be automatically attached to the welding torch as described above by using an exchange device as in Patent Document 1, one end side of the guide tube is displaced from the center line of the second body by an urging member. Therefore, the tip of the second body is set to the base end of the contact tip with the center line of the second body deviated from the center axis of the contact tip so that one end side of the guide tube enters the inside of the contact tip. Need to get closer to the side. Then, after one end side of the guide cylinder enters the guide hole of the contact tip, when the second body guided by the guide ring tries to move so that its center line coincides with the center axis of the contact tip, the urging member The welding torch rotates around one end side of the guide cylinder that comes into contact with the inner peripheral surface of the guide hole of the contact tip due to the urging force of the tip, and the failure prevention installed between the welding torch and the industrial robot or automatic machine. The shock sensor for the robot is activated and the contact tip cannot be attached.

The present invention has been made in view of the hanging point, and the purpose of the present invention is to automatically press the wire into the contact tip even if the structure for stabilizing the power supply is provided inside the welding torch. It is an object of the present invention to provide a contact tip mounting device capable of mounting work.

In order to achieve the above object, the present invention is characterized in that when the second body is guided by the guide member, the first body is supported from the side where the guide cylinder is displaced from the center line of the torch.

Specifically, a first body that is attached to an industrial robot or an automatic machine and has a center line that coincides with the center line of a guide cylinder that guides a wire, and a first body whose middle part is the first body. The contact tip is rotatably supported around the center of rotation orthogonal to the center line, and the contact tip is covered with the contact tip at the tip while the one end side of the guide tube passes through the inside. A second body that can be attached by rotating it relatively around the central axis and a guide that urges the base end side of the second body to rotate the second body around the center of rotation axis. The following solutions have been taken for a contact tip mounting device for an arc welding torch having an urging member that positions the cylinder at a position offset from the center line of the second body.

That is, in the first invention, the contact tip is arranged on the proximal end side of the rotating body set on the rotating body and the rotating body which rotates around the central axis of the contact tip in a state where the contact tip is set from the tip side. Then, the contact tip is moved from the position where one end side of the guide cylinder enters the inside of the base end side of the contact tip so that the center line of the second body coincides with the central axis of the contact tip. At the position of the guide member for guiding to and the guide start side of the second body by the guide member, and on the side where the guide cylinder in the guide path of the second body by the guide member is displaced by the urging member. It is provided with a movement restricting means which is arranged on the side and regulates the movement of the first body to the side where the guide cylinder is displaced by the urging member when the guide member guides the second body. It is characterized by being.

In the second invention, in the first invention, the movement restricting means extends in a direction in which the rotation axis extends in a direction orthogonal to the guide direction of the guide member of the second body, and the guide member of the second body. At the time of guidance, the guide roll is provided so as to come into contact with the outer peripheral surface of the first body and rotate around the axis of rotation.

In a third aspect of the invention, in the second invention, the movement restricting means includes a pair of support frames that rotatably support each end of the guide roll.

In the fourth aspect of the invention, according to the second or third aspect, the movement restricting means is provided with a position adjusting mechanism capable of adjusting the position of the guide roll in the horizontal direction orthogonal to the rotation axis. do.

In the first invention, the second body is guided by the guide member in a state where the center line of the second body is deviated from the central axis of the contact tip so that one end side of the guide cylinder enters the inside of the contact tip. When the tip of the second body is brought closer to the base end side of the contact tip, one end side of the guide tube enters the inside of the contact tip, and the center line of the second body guided by the guide member becomes the center axis of the contact tip. Gradually move in the same direction. At this time, since one end side of the guide cylinder comes into contact with the inner peripheral surface of the guide hole of the contact tip, the welding torch tries to rotate by the urging force of the urging member with the contact portion as a fulcrum. The movement restricting means comes into contact with the outer peripheral surface of the first body to prevent it. Therefore, the failure prevention shock sensor installed between the welding torch and the industrial robot or automatic machine does not operate, and the second body is urged until its center line coincides with the center axis of the contact tip. The guide member guides the contact tip to the contact tip while rotating with respect to the first body against the urging force of the member, so that the contact tip can be reliably attached to the tip of the second body. ..

In the second invention, when the second body is guided by the guide member, even if the outer peripheral surface of the first body comes into contact with the movement restricting means, the movement restricting means and the outer peripheral surface of the first body are subjected to the rotational operation of the guide roll. The resistance generated during is reduced. Therefore, the moving operation of the welding torch during the contact tip mounting work becomes smooth, and the contact tip mounting work can be performed efficiently.

In the third invention, since the rotation of the guide roll becomes stable when the outer peripheral surface of the first body comes into contact with each other, the moving operation of the welding torch during the attachment work of the contact tip can be further smoothed. Further, since the force applied to the guide roll from the first body can be received in two places, it is possible to reduce failures such as deformation and breakage of the device.

In the fourth invention, the position of the guide roll with respect to the first body when guiding the second body by the guide member can be changed between the approaching side and the separating side, so that the type of the welding torch is tentatively changed. Even if the outer shape of the first body changes, the guide roll can be brought into contact with the outer peripheral surface of the first body at an appropriate position, and the second body can be reliably contacted without operating the shock sensor for failure prevention. The contact tip can be attached to the tip of the body.

It is a schematic sectional drawing of the contact tip mounting apparatus which concerns on embodiment of this invention. It is the II arrow view of FIG. After FIG. 1, it is a figure which shows the state immediately after starting the attachment work of a contact tip. After FIG. 3, it is a figure which shows the state in the process of attaching a contact tip. After FIG. 4, it is a figure which shows the state just before the mounting work of a contact tip is completed. After FIG. 5, it is a figure which shows the state immediately after the attachment work of a contact tip is completed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example.

FIG. 1 shows a contact tip mounting device 1 according to an embodiment of the present invention. This contact tip attaching device 1 is for automatically attaching a thin rod-shaped contact tip 12 to an arc welding torch 10 attached to the tip of an arm of an industrial robot used when welding a steel plate or the like by arc welding. Is.

The arc welding torch 10 includes a torch body 11 having a substantially rod shape, and a cylindrical nozzle 13 is screwed and connected to the tip of the torch body 11 so as to be removable (see FIG. 6).

The torch body 11 has a substantially cylindrical shape, and a first body 14 having a center line C1 that coincides with the center line of a guide cylinder 15 having an elongated tubular shape for guiding a wire (not shown), and the first body. A second body 16 having a cylindrical shape provided on the tip end side of the 14 is provided, and the second body 16 is rotated around a rotation axis C2 whose middle portion is orthogonal to the center line C1 on the first body 14. It is movably supported.

One end side of the guide cylinder 15 passes through the inside of the second body 16, and the central axis of the contact tip 12 with the contact tip 12 covering one end side of the guide cylinder 15 at the tip of the second body 16. It can be attached by rotating it relatively around C3.

A first coil spring 17 (a urging member) that urges the base end side of the second body 16 to rotate the second body 16 around the rotation axis C2 is built in the middle portion of the first body 14. The guide cylinder 15 is displaced from the center line C4 of the second body 16 by rotating the second body 16 by the first coil spring 17.

The contact tip mounting device 1 includes a base plate 2 having a fitting hole 2a penetrating vertically, and a cylindrical bush 3 is fitted in the fitting hole 2a.

A cylindrical rotating body 4 whose center of rotation faces in the vertical direction is slidably inserted into the bush 3, and a second coil spring 5 is wound around the rotating body 4.

One end of the second coil spring 5 is in contact with the upper portion of the rotating body 4, while the other end is in contact with the peripheral edge of the upper opening of the bush 3, and the second coil spring 5 urges the rotating body 4 upward. ..

The contact tip 12 can be set inside the rotating body 4 by inserting the contact tip 12 from the upper end opening of the rotating body 4 so that the tip faces downward. The rotating body 4 is a drive mechanism (not shown). Therefore, the contact tip 12 set on the rotating body 4 is rotated around the central axis C3 of the contact tip 12.

A horizontally extending upper plate 6 is arranged above the base plate 2 at a predetermined distance from the base plate 2, and a mounting hole 6a penetrating vertically is formed at a position corresponding to the rotating body 4 of the upper plate 6. Has been done.

A guide ring 7 (guide member) having a short cylindrical shape whose center coincides with the central axis C3 of the contact tip 12 set in the rotating body 4 is attached to the mounting hole 6a.

That is, the guide ring 7 is arranged on the base end side of the contact tip 12 set on the rotating body 4, and the second body 16 of the torch body 11 inserted from above is set on the rotating body 4. It is designed to guide you to.

The upper end to the middle portion of the inner peripheral surface of the guide ring 7 has a tapered shape, while the lower cross section of the inner peripheral surface of the guide ring 7 has a shape corresponding to the cross section on the tip end side of the second body 16.

A movement restricting unit 8 (movement restricting means) is fixed to the side of the guide ring 7 on the upper surface of the upper plate 6. That is, the movement restricting unit 8 is on the guide start side of the second body 16 by the guide ring 7 and on the side where the guide cylinder 15 in the guide path of the second body 16 by the guide ring 7 is displaced by the first coil spring 17. It is located on the side.

The movement restricting unit 8 includes a guide roll 8a in which the rotation axis R1 extends in the horizontal direction, and a pair of support frames 8b that rotatably support each end of the guide roll 8a.

That is, the rotation axis R1 of the guide roll 8a extends in a direction orthogonal to the guide direction of the second body 16 of the torch body 11 by the guide ring 7.

The support frame 8b is rotatably supported by an L-shaped plate 8c fixed to the upper surface of the upper plate 6 and a rotation axis extending in the same direction as the rotation axis R1 on the L-shaped plate 8c. It is equipped with a V-shaped plate 8d.

The V-shaped plate 8d pivotally supports the guide roll 8a at the upper end portion, while the elongated hole 8e is formed at the lower end portion, and the pin 8f fixed to the L-shaped plate 8c is idle in the elongated hole 8e. It fits.

The V-shaped plate 8d, the elongated hole 8e, and the pin 8f constitute the position adjusting mechanism of the present invention, and the V-shaped plate 8d is L only within the range in which the pin 8f moves between one end and the other end of the elongated hole 8e. The position of the guide roll 8a can be adjusted in the horizontal direction orthogonal to the rotation axis R1 by rotating with respect to the character plate 8c.

The guide roll 8a of the movement restricting unit 8 is in a state where the guide cylinder 15 substantially coincides with the central axis C3 of the contact tip 12 set on the rotating body 4, and the guide ring 7 is the second body in the torch body 11. When guiding 16, as shown in FIGS. 3 to 5, the guide cylinder 15 is moved to the side displaced by the first coil spring 17 while contacting the outer peripheral surface of the first body 14 and rotating around the rotation axis R1. The movement of the first body 14 is restricted.

Further, the guide ring 7 is located at a position where one end side of the guide cylinder 15 enters the inside of the base end side of the contact tip 12 with the second body 16 in a state where the movement restricting unit 8 restricts the movement of the first body 14. 2 The center line C4 of the body 16 is moved so as to coincide with the central axis C3 of the contact tip 12 and is guided to the contact tip 12.

Then, when the tip of the second body 16 comes into contact with the base end of the contact tip 12 in the rotated state by the rotating body 4, the base end portion of the contact tip 12 is screwed and connected to the tip end of the second body 16. ing.

Next, the operation of attaching the contact tip 12 to the torch body 11 by the contact tip attaching device 1 will be described in detail.

First, as shown in FIG. 1, the operator inserts the contact tip 12 before use from the upper end opening of the rotating body 4 so that the tip side faces downward, and sets the contact tip 12 on the rotating body 4. ..

Next, the rotating body 4 is operated to rotate the contact tip 12 set on the rotating body 4 around the central axis C3 of the contact tip 12.

Next, an industrial robot (not shown) is operated to move the torch body 11 of the welding torch 10 from which the contact tip 12 and the nozzle 13 have been removed to the upper part of the guide ring 7 with the tip facing downward. At this time, the posture of the torch body 11 is set so that one end side of the guide cylinder 15 is shifted by the first coil spring 17 to be the movement restricting unit 8 side, and one end side of the guide cylinder 15 is a contact set on the rotating body 4. The position should be close to the central axis C3 of the chip 12.

After that, the torch body 11 is moved downward. Then, as shown in FIG. 3, first, one end side of the guide cylinder 15 that has passed through the guide ring 7 enters the inside of the base end side of the contact tip 12, and then the second body 16 of the torch body 11 is inserted into the guide ring 7. Will be done. At this time, the guide roll 8a of the movement restricting unit 8 comes into contact with the outer peripheral surface of the first body 14 of the torch main body 11 and rotates around the rotation axis R1 in connection with the movement of the torch main body 11.

When the torch body 11 is further moved downward, the guide ring 7 guides the second body 16 to be inserted and gradually moves the center line C4 so as to coincide with the central axis C3 of the contact tip 12. At this time, since one end side of the guide cylinder 15 comes into contact with the inner peripheral surface of the guide hole 12a of the contact tip 12, the torch body 11 tries to rotate by the urging force of the first coil spring 17 with the contact portion as a fulcrum. The movement restricting unit 8 contacts the outer peripheral surface of the first body 14 to prevent the rotation of the torch body 11 from rotating. Therefore, the failure prevention shock sensor attached between the welding torch 10 and the industrial robot does not operate.

After that, as shown in FIG. 4, the second body 16 of the torch main body 11 resists the urging force of the first coil spring 17 until the center line C4 coincides with the central axis C3 of the contact tip 12, and the first body 14 The guide ring 7 guides the contact tip 12 to the contact tip 12 while rotating with respect to the contact tip 12.

Then, as shown in FIG. 5, the tip of the second body 16 guided by the guide ring 7 comes into contact with the base end of the contact tip 12 rotated by the rotating body 4, and the base end portion of the contact tip 12 is moved downward. Press. Then, the rotating body 4 slides downward against the urging force of the second coil spring 5, and the contact tip 12 is screwed and connected to the tip of the second body 16 by the rotational operation of the rotating body 4.

After that, as shown in FIG. 6, by moving the torch body 11 upward, the second body 16 is pulled out from the rotating body 4 and the guide ring 7, and the work of attaching the contact tip 12 to the torch body 11 is completed. ..

As described above, according to the embodiment of the present invention, when the guide ring 7 guides the torch body 11, the movement restricting unit 8 restricts the lateral movement of the first body 14 in the torch body 11, and the welding torch 10 is used. Even if a structure for stabilizing power supply that presses the wire inside the contact tip 12 is provided inside the welding torch 10 by preventing the shock sensor provided between the and the industrial robot from operating, the torch body 11 The contact tip 12 can be automatically attached to the tip of the second body 16 of the above.

Further, when the guide ring 7 guides the second body 16, even if the outer peripheral surface of the first body 14 comes into contact with the movement restricting unit 8, the guide roll 8a rotates to cause the movement restricting unit 8 and the first body 14. The resistance generated between the outer peripheral surface and the outer peripheral surface is reduced. Therefore, the movement operation of the torch body 11 during the mounting work of the contact tip 12 becomes smooth, and the mounting work of the contact tip 12 can be performed efficiently.

Further, since the movement restricting unit 8 includes a pair of support frames 8b that rotatably support each end of the guide roll 8a, the rotation of the guide roll 8a when the outer peripheral surfaces of the first body 14 come into contact with each other. Becomes stable. Therefore, the moving operation of the welding torch 10 at the time of attaching the contact tip 12 can be made smoother. Further, since the force applied to the guide roll 8a from the first body 14 can be received in two places, it is possible to reduce failures such as deformation and breakage of the contact tip mounting device 1.

In addition, by rotating the V-shaped plate 8d with respect to the L-shaped plate 8c, the position of the guide roll 8a with respect to the first body 14 when the guide ring 7 guides the second body 16 is closer to the side. It can be changed to the separated side. Therefore, even if the type of the welding torch 10 changes and the outer shape of the first body 14 changes, the guide roll 8a can be brought into contact with the outer peripheral surface of the first body 14 at an appropriate position. The contact tip 12 can be reliably attached to the tip of the second body 16 without activating the failure prevention shock sensor.

In the embodiment of the present invention, the contact tip 12 is attached to the welding torch 10 attached to the industrial robot by using the contact tip attaching device 1, but the contact tip is attached to the welding torch 10 attached to the automatic machine. The contact tip 12 can also be attached using the device 1.

Further, in the embodiment of the present invention, the guide ring 7 guides the second body 16 to the contact tip 12 by inserting the second body 16 through the guide ring 7, but the present invention is not limited to this, and the second body 16 is not limited to this. If it is possible to guide the second body 16 to the contact tip 12, a guide member having a non-ring shape may be used to guide the second body 16 to the contact tip 12.

The present invention is suitable for a contact tip mounting device for mounting a contact tip on the tip of a welding torch for arc welding mounted on an industrial robot or an automatic machine.

1 Contact tip mounting device 4 Rotating body 7 Guide ring (guide member)
8 Movement control unit (movement control means)
8a Guide roll 8b Support frame 8d V-shaped frame (position adjustment mechanism)
8e long hole (position adjustment mechanism)
8f pin (position adjustment mechanism)
10 Arc Welding Torch 12 Contact Tip 14 1st Body 15 Guide Cylinder 16 2nd Body 17 1st Coil Spring (Bending Member)
C1 Center line of the first body C3 Center axis of the contact tip C4 Center line of the second body R1 Center of rotation of the guide roll

Claims (4)

A first body attached to an industrial robot or an automatic machine and having a center line that coincides with the center line of a guide cylinder that guides a wire, and a middle portion orthogonal to the center line of the first body. It is rotatably supported around the center of the rotation axis, and one end side of the guide cylinder passes through the inside and the contact tip covers one end side of the guide cylinder at the tip, and is relative to the center axis of the contact tip. The second body that can be attached by rotating the robot and the base end side of the second body are urged to rotate the second body around the axis of rotation to rotate the guide cylinder to the second body. A contact tip mounting device for an arc welding torch that has an urging member that is offset from the center line of the body.
With the contact tip set from the tip side, a rotating body that rotates around the central axis of the contact tip,
The center line of the second body is arranged on the base end side of the contact tip set on the rotating body, and the center line of the second body is from a position where one end side of the guide cylinder enters the inside of the base end side of the contact tip. A guide member that guides the contact tip while moving it so that it coincides with the central axis of the contact tip.
The guide cylinder is arranged at the position on the guide start side of the second body by the guide member and on the side of the side where the guide cylinder in the guide path of the second body by the guide member is shifted by the urging member. The contact is characterized in that the guide member includes a movement restricting means for restricting the movement of the first body to the side where the guide cylinder when guiding the second body is shifted by the urging member. Chip mounting device. In the contact tip mounting device according to claim 1,
In the movement restricting means, the rotation axis extends in a direction orthogonal to the guiding direction of the guide member of the second body, and when the guide member guides the second body, the outer peripheral surface of the first body is used. A contact tip mounting device comprising a guide roll configured to contact and rotate around the axis of rotation. In the contact tip mounting device according to claim 2,
The movement restricting means is a contact tip mounting device including a pair of support frames that rotatably support each end of the guide roll. In the contact tip mounting device according to claim 2 or 3.
The movement restricting means is a contact tip mounting device including a position adjusting mechanism capable of adjusting the position of the guide roll in a horizontal direction orthogonal to the rotation axis.

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