JP2580901B2 - Rotary arc welding torch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding torch used for rotary arc welding.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a configuration diagram of a conventional rotary torch shown in Japanese Patent Publication No. 1 (JP-A) No. 1;
The rotary torch is configured such that the electrode nozzle 1 is precessed by making a circular motion around a rotation center axis 10 by an eccentric rotating mechanism 5 with an upper end of the electrode nozzle 1 as a fulcrum 4. The welding wire 2 is connected to the electrode nozzle 1
And an arc 1 which is fed through the center of the power supply tip 3 attached to the tip thereof and is generated from the tip of the welding wire 2
1 is given a circular motion of a predetermined diameter. A fulcrum 4 at the upper end of the electrode nozzle 1 is supported by a gear box via a self-aligning bearing (not shown), and an intermediate part of the electrode nozzle 1 is similarly supported at an eccentric position of the eccentric gear 6 via a self-aligning bearing 14. Have been. The drive gear 8 of the motor 7 is meshed with the eccentric gear 6, and these constitute the eccentric rotation mechanism 5. An energizing portion 15 for the welding wire 2 is provided immediately above the fulcrum 4 of the electrode nozzle 1, and applies a welding current to the welding wire 2 through the electrode nozzle 1 and the power supply tip 3. For this reason, an insulating bush (not shown) for electrical insulation is inserted between the electrode nozzle 1 and the self-aligning bearings forming the fulcrum of the upper end portion and the intermediate portion.

[0003]

The conventional rotary torch is constructed as described above, and usually has an electrode nozzle 1 of 600.
Although it was rotated at 0 rpm (100 Hz) and used, intense vibration sometimes occurred because the electrode nozzle 1 was long (Lo = 190 mm). Further, in addition to the fulcrum 4 of the precession of the electrode nozzle 1 being set above the gear box, the energizing portion 15 is provided immediately above the fulcrum 4, so In order to supply a welding current to the power supply tip 3, the electrode nozzle 1 cannot be made too thin to suppress heat generation, and an insulating bush must be inserted between the electrode nozzle 1 and the self-aligning bearing 11. Since the self-aligning bearing 11 to be used must be large, high-speed rotation is limited.

[0004] The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a rotary arc welding torch capable of suppressing vibration of an electrode nozzle during rotation and capable of high-speed rotation. .

[0005]

In order to achieve the above-mentioned object, a rotary arc welding torch according to the present invention has an intermediate portion of an electrode nozzle as a fulcrum of precession, and an eccentric rotation mechanism is provided above the electrode nozzle. , Place the energizing part directly below the fulcrum ,
Furthermore, the configuration of the electrode nozzle detachably configured in the lower half and the upper half, using the strength member or insulating member is in the upper half, the lower half portion of using conventionally good conductive member I did .

[0006]

In this rotary torch, the arc from the tip of the welding wire rotates at a predetermined diameter because the electrode nozzle performs precession with the intermediate portion as a fulcrum, as in the conventional example.
Since the intermediate portion of the electrode nozzle is a fulcrum of precession, the length from the fulcrum to the tip of the power supply tip can be shortened,
Vibration of the electrode nozzle can be suppressed. In addition, by providing the current-carrying part directly below the fulcrum, the welding current mainly flows through the lower half of the electrode nozzle, so that heat generation in the upper half is eliminated and the diameter of the electrode nozzle can be reduced. Can be reduced, so that high-speed rotation is possible. In addition, since the current is conducted through the lower half of the electrode nozzle, the upper half of the electrode nozzle is considered in terms of strength and insulating center, so that the electrode nozzle can be separated into an upper half and a lower half. A strong or insulative member made of steel or ceramics is used, and a good conductive member made of copper or the like is used only in the lower half. As a result, the upper half of the electrode nozzle can be made thinner, and the insulating bush and the self-aligning bearing can be reduced, or the insulating bush itself can be omitted, so that higher-speed rotation is possible.

[0007]

1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 3 is a sectional view of an eccentric rotation mechanism. As shown in the figure, an intermediate portion of the electrode nozzle 1 is supported at a position corresponding to a lower portion of the gear box 16 via an insulating bush 12 and a self-aligning bearing 13 to form a fulcrum 4 of precession. An eccentric rotation mechanism 5 is provided in the gear box 16, and a self-aligning bearing 14 and an insulating bush 17 are provided between an upper end of a rotary cylinder 9 constituting a part of the eccentric rotation mechanism 5 and an upper part of the electrode nozzle 1. To support the upper part of the electrode nozzle 1. The eccentric gear 6 is attached to the outer circumference of the rotary cylinder 9 and meshes with the drive gear 8 of the motor 7. The rotating cylinder 9 is provided coaxially with the axis of the electrode nozzle 1, and has a bearing 18,
19 is rotatably supported in the gear box 16. The conducting part 15 is provided immediately below the fulcrum 4, that is, in the middle of the electrode nozzle 1. The welding wire 2 is fed to the center of the electrode nozzle 1 and the power supply tip 3.

In this embodiment, if the drive gear 8 and the eccentric gear 6 are rotated by the motor 7, the upper part of the electrode nozzle 1 is set at the intermediate portion as the fulcrum 4 as shown in FIG. The electrode nozzle 1
Performs precession with the middle part as the fulcrum 4. Since the energizing section 15 is provided immediately below the fulcrum 4, the welding current flows through the lower half of the electrode nozzle 1 and is supplied to the welding wire 2 from the power supply tip 3 at the lower end. Therefore, an arc 11 is generated from the tip of the welding wire 2, and the arc 11 rotates around the rotation center axis 10.

With the above construction, the length L from the fulcrum 4 of the precession to the tip of the feed tip 3 at the lower end of the electrode nozzle 1 can be significantly reduced to about 100 mm.
000rpm (100Hz)-9000rpm (150H
The vibration of the electrode nozzle 1 did not occur even during the high-speed rotation of z). In addition, since the conducting portion 15 is provided immediately below the fulcrum 4, that is, in the middle portion of the electrode nozzle 1, almost no current flows in the upper half portion of the electrode nozzle 1, so that no heat is generated and the electrode nozzle 1 is made relatively thin. And thus the insulating bushes 12, 17 and the self-aligning bearings 13,
14 can be reduced, so that the electrode nozzle 1 can be rotated at a high speed.

FIG. 4 is a sectional view showing another embodiment of the present invention. In the above-mentioned embodiment, the electrode nozzle 1 is made of an integral type, that is, the whole is made of a copper rod. Is configured such that the electrode nozzle 1 can be separated into an upper half 1a and a lower half 1b with a screw 1c, only the lower half 1b is made of a good conductive material such as copper, and the upper half 1a is made of steel such as S45C. Alternatively, a strength member such as a ceramic member or an insulating member is used. Other configurations are the same as in the above embodiment.

As described above, since power is mainly supplied through the lower half 1b of the electrode nozzle 1, if a strength member such as S45C steel is used for the upper half 1a, the upper half 1a can be made thinner. Can self-aligning bearings 13,14
Can be reduced, so that it can be adapted to high-speed rotation. Further, if an insulating member such as ceramics is used for the upper half 1a, the insulating bushes 12 and 17 become unnecessary, and the self-aligning bearings 13 and 14 become smaller. , Further enabling high-speed rotation.

[0012]

As described above, according to the present invention, the intermediate portion of the electrode nozzle is used as the fulcrum of the precession movement, and the current-carrying part is provided immediately below the fulcrum. Thus, vibration of the electrode nozzle during rotation can be suppressed. Further, the upper half from the fulcrum is almost irrelevant to energization and does not generate heat, so that the diameter of the electrode nozzle, the diameter of the insulating bush and the self-aligning bearing can be reduced, and the high-speed rotation of the electrode nozzle can be realized. Further, by using a strength member or an insulating member in the upper half of the electrode nozzle, it is possible to realize a higher speed rotation.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the eccentric rotation mechanism of the embodiment.

FIG. 3 is an explanatory diagram showing the operation of the embodiment.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional rotary torch.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 electrode nozzle 2 welding wire 3 feeding tip 4 fulcrum 5 eccentric rotation mechanism 6 eccentric gear 7 motor 8 drive gear 9 rotating cylinder 10 rotation center axis 11 arc 12, 17 insulating bush 13, 14 self-aligning bearing 15 conducting part 16 gear box 18,19 Bearing

Claims (1)

(57) [Claims] 1. An electrode nozzle having a power supply tip at a tip, a welding wire passing through the center of the electrode nozzle and the power supply tip, a self-centering bearing having a fulcrum at an intermediate portion of the electrode nozzle, and an upper part of the electrode nozzle comprising an eccentric rotating mechanism for circular motion through the self-aligning bearing, and a conductive portion provided on the electrode nozzle immediately below the fulcrum, is
Further, the electrode nozzle is configured to be separable into an upper half and a lower half.
The upper half is a strength member or an insulating member, and the lower half is
A rotary arc welding torch characterized in that a portion is made of a good conductive material .