JPH0137831Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of an automatic welding torch in an arc welding robot.

Since the semi-automatic welding torch corrects the trajectory of the welding core line by human visual inspection, there is no problem even if the direction of the conductor tube varies slightly.

However, when automatically welding a certain trajectory using an automatic welding torch with automatic welding equipment or robots, (a) when the contact tip wears out and is replaced, (b) when the welding torch is replaced, (h) ) When the conductor tube is replaced, (d) There is a problem such as the trajectory suddenly shifting during welding. If the trajectory shifts, automatic welding equipment will adjust the position of the welding torch, and a robot with a teaching playback will not be able to perform teaching. I had to redo it.

The reason for this is that in (a), the torque when tightening the contact chip was stronger than the tightening torque of the conductor tube, and the direction of the conductor tube changed depending on the connection position with the connector block.

In (b) and (c), although there are variations in the welding torch,
In particular, the reason for this variation is that the conductor tube is generally fixed to the connector block with screws, so the tightening screws are tightened to prevent them from loosening, but the accuracy of the screws installed on the conductor tube and connector block, Although the direction of the conductor tube is determined by its length, it is practically impossible to always keep the precision and length of the screw constant.

In (d), if the tightening screw of the conductor tube is not securely tightened during welding, the tightening screw will loosen due to the tension of the conduit cable or the reaction force of the core wire during welding, and the direction of the conductor tube will change.

As mentioned above, when welding is carried out using an automatic welding torch, the cause of deviation in the trajectory of the core wire lies in the connection means between the conductor tube and the connector block.

Conventional automatic welding mainly uses specialized machines, and most of the welding lines are simple straight lines, and even if the welding torch fluctuates somewhat, the trajectory of the core wire tip can be corrected with a simple adjustment.

However, in recent years, welding of complex shapes has come to be performed using automatic welding equipment or robots, but these welds require changing or rotating the welding angle of the torch, which essentially causes the torch to vary. However, adjusting the trajectory of an automatic welding device is extremely difficult, and correcting the trajectory of a robot requires re-teaching at each point. Especially in the case of a curved torch, if the position of the conductor tube changes, the amount of trajectory deviation is large.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic torch for arc welding robots having a new structure that eliminates the disadvantages of conventional devices.

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

FIG. 1 is a cross-sectional view of an automatic welding torch according to an embodiment of the present invention, FIG. 2 is a partially detailed perspective view thereof, and FIG. 3 is a perspective view of the present invention mounted on an arc welding robot.

In FIG. 1, a cable hose containing a gas hose, a wire conduit and a conductor is fixed to a copper connector block 1 of an automatic welding torch. Further, a hole 2 through which a wire conduit and gas pass is provided inside the connector block 1, and a hole 2 through which a conductor tube 3 can pass is provided.
The side hole 4 is made larger than the hole 2, and has a key-shaped protrusion 5 (although it does not have to be as long as a key).
It is sufficient that it can be positioned and resist external force to a certain extent), and a male thread 6 is cut on the outside.

A hole 7 through which wire conduit and gas pass is machined inside the copper conductor tube 3.
A boss 8 and a convex flange 9 are provided on the connector block 1 side. A keyway-shaped recess (or slit) 10 is cut into the boss 8 of the insertion part, and the outer diameter and recess 10 correspond to the hole 4 of the connector block 1.
It is possible to insert it into the inner diameter and the convex portion 5 appropriately. The tightening nut 11 has a female thread 12 cut therein, and the female thread 12 is a cap nut, and its boss portion 13 is slidable on the outer diameter of the conductor tube 3.

14 is an insulating cover of the tightening nut, 15 is an insulating tube of the conductor tube, 16 is a gas diffuser, 17 is a contact chip, 18 is a nozzle insulating bush, 19 is a nozzle, and 20 is a core wire.

In Fig. 3, 21 is a connector block;
22 is an arm, and 23 is a support member.

The operation of the present invention having the above configuration will be explained.

When performing automatic welding, the torch is fixed by the connector block 1 of the automatic welding torch.

When replacing the conductor tube 3 attached to the connector block 1 (it is bent in a curved torch and not straight in a straight torch), the protrusion 5 provided on the connector block 1 and the recess provided in the conductor tube 3 are removed. 10, insert the insertion part 8 into the hole 4, and turn the tightening nut 11. The male thread 6 of the connector block 1 and the female thread 12 of the tightening nut 11 are connected, and the boss 8 side of the flange 9 of the conductor tube 3 is connected. The conductor tube 3 is inserted until the end of the male screw 6 contacts the holder, and the tightening nut 11 is turned until the bag part contacts the other end of the flange 9.

The direction of the conductor tube 3 is determined by the convex portion 5 and the concave portion 10, and the connector block 1 end and the tightening nut 1 are attached to both flange surfaces of the flange 9 provided on the conductor tube 3, respectively.
By making contact with the bag surface of No. 1, complete screw tightening and longitudinal direction control can be achieved.

Thus, since the present invention has such a configuration, the conductor tube 3 of the automatic welding torch
The fixing of the connector block 1 becomes easy and reliable. Furthermore, since the positional relationship between the conductor tube 3 of the automatic welding torch and the connector block 1 remains constant even if the conductor tube 3 is replaced, there is no need to correct the welding trajectory using an automatic welding device or a robot. Furthermore, when replacing the contact tip 17, the contact tip 1
7 is fixed to the gas differential user 16 by tightening a screw, but when loosening the screw, the tightening force of the conductor tube 3 is weakened, and the reaction force of the core wire or the nozzle hits the workpiece during welding, causing the conductor tube 3 Although the direction of the conductor may change and the trajectory may go awry, the convex portion 5 of the connector block 1 and the concave portion 10 of the conductor tube 3 completely eliminate the problem of the tightening force becoming weak and changing its direction.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an automatic welding torch according to an embodiment of the present invention, FIG. 2 is a partially detailed perspective view thereof, and FIG. 3 is a perspective view of the present invention mounted on an arc welding robot. 1... Connector block, 2, 7... Hole (through which wire conduit and gas pass), 3... Conductor tube, 4... Hole, 5... Key-shaped protrusion, 6...
Male screw, 8...Boss, 9...Convex flange, 10...Keyway-shaped recess or slit, 11...Tightening nut (bag-like), 12...Female thread, 13...Boss, 14
…Insulation cover, 15…Insulation tube, 16…Gas differential user, 17…Contact chip, 18
... Nozzle insulation bushing, 19... Nozzle, 20... Core wire, 21... Connector block, 22... Arm,
23...Supporting member.

Claims (1)

[Scope of utility model registration request] In an automatic welding torch that is attached to the tip of an arm of an arc welding robot, it is supported by the arm, has a protrusion, recess, or slit at the tip of the inner hole, a connector block with a male thread on the outer periphery, and a connector block at one end facing the workpiece. It has a nozzle part, and has a recess, slit, or protrusion that engages with a protrusion or recess of the connector block on the outer periphery of the other end that is fitted and fixed into the inner hole of the connector block, and has a recess, a slit, or a protrusion that engages with the protrusion or recess of the connector block, and is connected to the end surface of the connector block. 1. An automatic welding torch for an arc welding robot, comprising a flange that abuts, and a conductor tube that is fitted into the nozzle side of the flange and has a hook nut that screws with the male thread of the connector block.