JP2002192345A - Replacement device for welding nozzle and tip - Google Patents

Abstract

(57) [Problem] To provide a welding nozzle / tip replacement device which is compact and can be easily controlled. A nozzle changer (2) detachably fitted to a welding core wire cutting device (7), a nozzle (14), and disengaged from the torch body (11) with a nozzle (14). A tip changer 3 for unscrewing the tip 13 with the torch body 11, a tip holder 4 on which a cleaned tip is fitted, and a nozzle holder 5 on which a cleaned nozzle is fitted, The nozzle changer 2, the tip changer 3, the tip holder 4 and the nozzle holder 5 are provided with a rotary motor 6.
Welding nozzle and tip changer that can be rotated by.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for exchanging a nozzle tip at the tip of a welding torch of a welding robot.

[0002]

2. Description of the Related Art In conventional arc welding using a shielding gas, poor welding quality such as pits and blowholes in a weld bead caused by clogging of nozzles due to spatter, and misalignment of a welding core wire due to a decrease in welding chips are generated. There's a problem. Therefore, it is necessary for an operator to periodically clean the nozzle and replace the welding tip.

[0003] However, in the case of fully automatic welding by a welding robot, it is necessary to completely stop the machine equipment line before cleaning the nozzle and replacing the welding tip, thereby lowering the operation rate of the machine equipment and reducing man-hours. There is a problem of hanging. Further, as shown in FIG. 3, the sputter S penetrates deep into the nozzle, so that, for example, a commercially available nozzle cleaner cannot completely remove spatter.

[0004] As a nozzle / tip exchanging device capable of automatically exchanging a nozzle and a tip of a welding torch, there is one disclosed, for example, in Japanese Utility Model Publication No. 1-40622.

[0005] As shown in Figs. 5 and 6, the nozzle / tip exchanging device A is fitted to a core wire cutting device 18 for cutting a tip end of a welding core wire protruding from the tip, and is detachably fitted to the nozzle. And a first motor connected to a rotary motor 14a that rotates in a direction in which the nozzle is disengaged from the torch body.
Nozzle chuck 13a, a second nozzle chuck 13b that is detachably fitted to the nozzle, and is connected to a rotary motor 14b that rotates in the opposite direction to the first nozzle chuck 13a, and is detachably attached to the chip. And a first chip chuck 15a connected to a rotary motor 16a that rotates in a direction to unscrew the chip from the torch body.
And a rotary motor 16b which is detachably fitted to the chip and rotates in the opposite direction to the first chip chuck 15a.
And a second chip chuck 15b connected to the second chip chuck 15b. Reference numeral 17 denotes the rotary motors 14a, 14b, 16a,
A substrate to which 16b is fixed, 19 is a fixed blade, and 20 is a movable blade.

[0006]

However, in the nozzle / tip changing apparatus A disclosed in the above publication, the first nozzle chuck 13a, the second nozzle chuck 13b,
Each of the first chip chuck 15a and the second chip chuck 15b is individually
Since these mechanisms rotate at b, 16a, and 16b, the installation of these four rotary motors requires considerable space. For this reason, there has been a problem that the exchange device A itself becomes large-scale and expensive, and the control of the four rotary motors becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a compact and easily controllable welding nozzle tip by using a rotary motor for rotating the first and second nozzle chucks and the first and second tip chucks. It is to provide a switching device.

[0008]

According to a first aspect of the present invention, there is provided a welding torch nozzle provided by screwing a tip for guiding a welding core wire and a nozzle surrounding the tip with a torch main body. A device for exchanging a tip, the exchanging device comprising: a core wire cutting device for cutting a distal end portion of a welding core wire protruding from the tip; A nozzle changer for unmating, a chip changer that is removably fitted to the chip and unscrews the chip from the torch body, a chip holder with a cleaned chip previously fitted, and a cleaned nozzle And a nozzle holder fitted in advance, wherein the nozzle changer, the tip changer, the tip holder and the nozzle holder are combined. To those which are rotatable in the same rotary motor.

According to the present invention, the nozzle changer, the tip changer, the tip holder and the nozzle holder can be respectively rotated by the same rotary motor, so that no space is required for installation of the rotary motor and replacement is possible. The device itself becomes compact.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory longitudinal sectional view showing a first embodiment of a welding nozzle / tip exchanging apparatus according to the present invention, and FIG. 2 is a plan view corresponding to FIG.

As shown in FIG. 1, the welding nozzle of the present invention
The tip changer A includes a nozzle changer 2, a tip changer 3, a tip holder 4, a nozzle holder 5,
It comprises a rotary motor 6, a guide plate 7, and a core wire cutting device 8. Both changers 2 and 3 and both holders 4 and 5 are arranged in storage holder B, respectively.
The storage holder B can be moved right and left in the drawing by the rack and pinion mechanism by forward rotation or reverse rotation of the rotation motor 9.

On the other hand, gears 21a, 31 are respectively provided on the outer periphery of the lower ends of both changers 2, 3 and both holders 4, 5.
a, 41a, and 51a are provided.
1a meshes with a gear 6a fitted to the rotation shaft of the rotation motor 6, so that the rotation of the rotation motor 6 can be reversed. The rotation motor 6 can rotate forward and backward.

An insertion hole 71 is provided substantially at the center of the guide plate 7, and an inner peripheral surface 71a of the insertion hole 71 is a conical surface whose diameter decreases downward. The core wire cutting device 8 is installed on the upper surface of the guide plate 7 so as to be movable to the center of the insertion hole 71.

As shown in FIGS. 3 and 4, the welding torch 1 has a tip 13 screwed into a screw of a cylindrical tip body 12 fitted into a torch body 11, and
A cylindrical nozzle 14 is screwed into a screw on the outer surface of the torch main body 11 so as to surround the torch 3. The tip 13 has a conical cylindrical shape for guiding the welding core wire 15. An outlet 121 for a shielding gas is provided in a wall portion on the base side of the chip body 12.

The nozzle changer 2 is removably fitted to the outer surface of the nozzle 14 to form a torch body 11 of the nozzle 14.
For unscrewing the outer cylinder 2a,
It comprises an inner cylinder 2b, which is a changer body, and a coil spring 2c arranged between the bottoms of the two members.

The tip changer 3 is removably fitted to the outer surface of the tip 13, and the torch body 11 of the tip 13 is
For unscrewing the outer cylinder 3a,
It comprises a changer body 3b and a coil spring 3c arranged between the bottoms of the two members.

The tip holder 4 is for screwing a new tip into the torch body 11 and attaching it.
It comprises an outer cylinder 4a, a holder body 4b, and a coil spring 4c arranged between the bottoms of the two members. As shown in FIG. 1, the cleaned tip 13N is fitted in the holder body 4b in advance. Note that the tip holder 4 has the same structure as the tip changer 3.

The nozzle holder 5 is for screwing a new nozzle into the torch body 11 for mounting.
It comprises an outer cylinder 5a, an inner cylinder 5b as a holder body, and a coil spring 5c arranged between the bottoms of these members. In the holder body 5b, the cleaned nozzle 14N
Are fitted in advance. The nozzle holder 5
Has the same structure as the nozzle changer 2.

Then, the nozzle changer 2, the tip changer 3, the tip holder 4 and the nozzle holder 5 are sequentially fed to a predetermined position above the rotary motor 6, and the rotary motor 6 is rotated in the reverse direction, so that the nozzle and the tip are rotated. An exchange operation is performed.

By removing the tip 13 and rotating the rotary motor 6 forward, a new tip 13N and a new nozzle 14N can be attached.

Next, a method of replacing the nozzle and the tip with new ones by using the above-described replacement device A will be described.

First, the storage holder B is moved to the left by driving the rotary motor 9 so that the nozzle changer 2 is positioned as shown in FIG. The welding torch 1 is fitted into the inner cylinder 2b using the insertion hole 71 of the guide plate 7,
The rotating nozzle 6 is rotated to remove the used nozzle 14 from the torch main body 11. At this time, since the coil spring 2c is disposed between the outer cylinder 2a and the inner cylinder 2b, the nozzle 14 unscrewed from the torch main body 11 moves downward together with the inner cylinder 2b.

The welding torch 1 is moved upward to return to the original position, and the core wire cutting device 8 is moved.
The tip of the welding core wire 15 projecting from the tip of the tip 13 is cut. After cutting the welding core wire 15, the welding core wire 15 is pulled back by a predetermined welding core wire feeding device (not shown).

Next, the rotation motor 9 is driven to move the storage holder B to the left, so that the center of the chip changer 3 matches the center of the insertion hole 71 of the guide plate 7. Then, the welding torch 1 from which the nozzle 14 has been removed is fitted into the changer main body 3b by using the insertion hole 71 of the guide plate 7 as in the case of the nozzle 14, and the used motor is rotated by rotating the rotary motor 6. Remove the tip 13 from the torch main body 11. At this time, since the coil spring 3c is arranged between the outer cylinder 3a and the changer main body 3b, the torch main body 1
The tip 13 to be unthreaded with the changer body 3
It moves downward with b. After removing the tip 13, the welding torch 1 is moved upward to return to the original position.

In the same manner as described above, the rotation motor 9 is driven to move the storage holder B to the left so that the center of the chip holder 4 coincides with the center of the insertion hole 71 of the guide plate 7. Then, the tip body 12 of the welding torch 1 is brought close to the recess of the holder body 4b using the insertion hole 71 of the guide plate 7, and the tip of the tip body 12 is brought into contact with the threaded portion of the cleaned tip 13N. The rotating motor 6 is rotated in the opposite direction to the above case, and the chip 13N is rotated together with the holder body 4b, and is screwed into the tip screw portion of the chip body 12 and attached. At this time, since the coil spring 4c is disposed between the outer cylinder 4a and the holder main body 4b, the tip 13N
The holder main body 4b moves upward together with the tip 13N as the threaded portion is screwed into the tip threaded portion of the chip body 12.

After the tip 13N is attached to the tip of the tip body 12, the welding torch 1 is moved upward to return to the original position, and the welded core wire 15 that has been pulled back is fed by a welding core wire feeding device (not shown). It is sent out and protruded from the tip of the chip 13N. Next, the rotation motor 9 is driven to move the storage holder B to the left, and the center of the nozzle holder 5 is aligned with the center of the insertion hole 71 of the guide plate 7.

Then, the tip 13N and the tip body 12 of the welding torch 1 are inserted into the nozzle 14N fitted in the inner cylinder 5b by using the insertion hole 71 of the guide plate 7, and the tip of the torch body 11 is cleaned. Abut the threaded portion of the completed nozzle 14N. The rotary motor 6 is rotated in the opposite direction to the above case, and the nozzle 14N also rotates together with the holder main body 5b, and is screwed into the distal end thread portion of the torch main body 11 and attached. At this time, since the coil spring 5c is disposed between the outer cylinder 5a and the holder main body 5b, the holder main body 5b moves upward together with the nozzle 14N as the screw portion of the nozzle 14N is screwed into the tip screw portion of the torch main body 11. I do. Thus, the replacement work of the nozzle and the tip is completed.

In the above embodiment, the nozzle changer 2, the tip changer 3, the tip holder 4 and the nozzle holder 5 are fed linearly below the insertion hole 71 of the guide plate 7, but this feed mechanism is rotated. It may be an expression.

[0029]

According to the first aspect of the present invention, since the nozzle changer, the tip changer, the tip holder and the nozzle holder are each rotatable by the same rotary motor, space is required for installing the rotary motor. Instead, the exchange device itself becomes compact.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of an apparatus for exchanging welding nozzle tips according to the present invention.

FIG. 2 is a plan view corresponding to FIG.

FIG. 3 is an explanatory diagram showing a clogged state in a welding nozzle due to spatter.

FIG. 4 is an explanatory view showing a disassembled state of a welding torch.

FIG. 5 is a plan view showing a conventional welding nozzle / tip changing device.

FIG. 6 is a front view corresponding to FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding torch 11 Torch body 12 Tip body 13 Tip 14 Nozzle 15 Welding core B Storage holder 2 Nozzle changer 3 Tip changer 4 Tip holder 5 Nozzle holder 6 Rotary motor 7 Core cutting device

Claims (1)

[Claims] An apparatus for exchanging a tip with a nozzle of a welding torch provided by screwing a tip for guiding a welding core wire and a nozzle surrounding the tip with a torch main body, respectively. The device consists of a core wire cutting device that cuts the tip of the welding core wire protruding from the tip, a nozzle changer that is detachably fitted to the nozzle and unscrews the nozzle from the torch body, and detachably engages with the tip. It consists of a tip changer that fits and unscrews the tip from the torch body, a tip holder with the cleaned tip pre-fitted, and a nozzle holder with the cleaned nozzle pre-fitted, The nozzle changer, the tip changer, the tip holder and the nozzle holder are all rotatable by the same rotary motor. A welding nozzle / tip changing device.