JPH115169A - High-speed arc welding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the high-speed rotating arc welding device which perfectly prevent a spatter and fume from intruding into a easing which stores a driving system of an electrode. SOLUTION: An electrode 1 is provided with a easing 2 having an opening 22, through which the bottom end of the electrode extrudues. The electrode 1 is supported by an eccentricity rotary unit 24 at its middle part, and a circular motion is given at its bottom part making the top part act as a fulcrum. Within the electrode 1, a sealed gas is fed to circulate and a sealded gas arc welding is conducted. At the opening 22 side, a shielding method 30 is provided, which is constituted with a sliding groove 17 and a shielding plate 14. A blowout hole 11 is provided and a part of shielded gas is blow off from here. A secondary ball bearing 8, which supports the bottom end part of the eccentricity rotary unit 24, and a ball bearing 10 is provided with a shielding function against the shielded gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed rotary arc welding apparatus for performing arc welding by giving a circular motion to a welding arc.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of a high-speed rotating arc welding apparatus as described above (for example, Japanese Patent Application Laid-Open No. 6-320282).
FIG. The high-speed rotary arc welding apparatus shown in the figure includes a casing 32 having an opening 41 at the lower end in the figure, and the electrode rod 31 is provided so that the lower end of the casing 32 projects downward from the opening 41 of the casing 32.
The upper end of the electrode rod 31 is supported by the casing 32 via the first self-aligning bearing 34, while the intermediate portion thereof is supported by the eccentric rotating body 39 via the second self-aligning bearing 40. I have. Further, this eccentric rotator 39
Is rotatably supported in the casing 32 by bearings 37 and 38, and an annular driven gear 36 attached to the outer peripheral surface thereof is meshed with a drive gear 35 attached to an output shaft 42 of the motor 33. .

When the motor 33 operates in the high-speed rotating arc welding apparatus, the rotation of the output shaft 42 is transmitted to the eccentric rotating body 39 via the driving gear 35 and the driven gear 36. Then, the inner peripheral surface of the eccentric rotator 39 rotates with a certain amount of eccentricity.
With the upper end supported by the self-aligning bearing 34 as a fulcrum, a circular motion is performed about the rotation axis 45. By this, the arc 43 generated at the tip of the welding wire 44 is given a rotation, and a good bead shape with a smooth surface is obtained, and the arc itself is used as a sensor by detecting the welding current, so that the groove following control is performed. High-speed rotary arc welding, which can be performed with high accuracy, has been performed.

[0004]

In the above-described high-speed rotary arc welding apparatus, since the lower end of the electrode rod 31 performs a circular motion, an opening 41 having a predetermined diameter is formed at the lower end of the casing 32 through which the electrode rod 31 is inserted. Must be provided. on the other hand,
The electrode rod 31 is provided in the casing 32 above the opening 41.
There are provided drive mechanisms such as a first self-aligning bearing 34 that supports the upper end side, a second self-aligning bearing 40 that supports the intermediate portion, and two bearings 37 and 38 that support the eccentric rotator 39. However, when arc welding is performed, spatters and fumes are generated from the welding points, and these spatters and fumes enter the casing 32 through the opening 41. Then, the spatters and fumes enter the raceway surfaces of the self-aligning bearings 34 and 40 and the bearings 37 and 38 and hinder their smooth operation. In the worst case, the circular motion on the lower end side of the electrode rod 31 is reduced. There was also a risk of stopping.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to reliably prevent spatter and fumes from entering a casing accommodating a drive mechanism for an electrode rod. It is an object of the present invention to provide a high-speed rotating arc welding device that can be used.

[0006]

According to the present invention, there is provided a high-speed rotary arc welding apparatus comprising: a casing having an opening at one end; an electrode rod having a distal end facing the outside through an opening of the casing; An eccentric rotator rotatably supported and rotatably supported within the eccentric rotator, the eccentric rotator supporting an intermediate portion of the electrode rod with the eccentric rotator as a fulcrum. While giving circular motion to the welding arc generated in the electrode rod, a shield gas is circulated from the base end side to the distal end side inside the electrode rod, and this shield gas is blown out from the distal end side of the electrode rod to form a shield gas type arc welding. In the high-speed rotating arc welding apparatus, the electrode rod is provided with a blowout hole for blowing out a part of the shield gas at an intermediate portion thereof, and the blowout hole is provided in the casing on the opening side of the eccentric rotary body. It is characterized by forming a gas chamber to be filled with a pressure higher than the shielding gas blown out from the hole atmospheric pressure.

In the high-speed rotating arc welding apparatus according to the first aspect of the present invention, the gas chamber for filling the gas at a pressure higher than the atmospheric pressure is formed on the opening side of the eccentric rotary body.
It is possible to reliably prevent fumes from entering the casing. In addition, since a part of the shield gas flowing through the electrode rod flows out of the electrode rod and fills the chamber, the configuration can be made very simple. Further, since the shielding gas is discharged from the electrode rod, it is possible to reliably prevent the fume from entering the casing.

According to a second aspect of the present invention, there is provided a high-speed rotating arc welding apparatus, wherein a sliding groove provided on an inner side surface of the casing and an electrode rod on a tip end side of the eccentric rotating body are provided, and a peripheral edge thereof is provided with the sliding edge. A shielding means comprising a shielding member fitted slidably into the groove is provided.

In the high-speed rotating arc welding apparatus according to the second aspect, the shielding means surely prevents the invasion of spatter into the casing, and at the same time, constitutes a gas shield on the casing opening side of the gas chamber. Becomes possible.

According to a third aspect of the present invention, in the high-speed rotating arc welding apparatus, the eccentric rotator is rotated in the casing by an annular support member having a shielding gas shielding function interposed between the eccentric rotator and the casing. It is characterized by being freely supported.

In the high-speed rotary arc welding apparatus according to the third aspect, the eccentric rotary member is rotatably supported by the annular support member, and the gas chamber is formed with a gas shield on the side opposite to the casing opening side. It becomes possible.

According to a fourth aspect of the present invention, there is provided a high-speed rotating arc welding apparatus having a casing having one end opened, an electrode rod having a front end exposed to the outside from the casing opening, and rotatably supported in the casing. An eccentric rotating body driven to rotate by rotating the electrode rod with the base end of the electrode rod as a fulcrum. The eccentric rotating body supports an intermediate portion of the electrode rod, and the welding arc generated on the distal end side of the electrode rod moves circularly. In the high-speed rotating arc welding apparatus, a sliding groove provided on the inner surface of the casing and an electrode rod at a tip end side of the eccentric rotating body are provided, and the periphery thereof is slidable in the sliding groove. And a shielding means comprising a shielding member fitted so as to be fitted.

[0013] In the high-speed rotating arc welding apparatus according to the fourth aspect, it is possible to reliably prevent the invasion of spatter into the casing and to suppress the intrusion of fume, while having a simple configuration.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the high-speed rotating arc welding apparatus of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing the high-speed rotating arc welding apparatus. This high-speed rotating arc welding apparatus includes a casing 2 having an opening 22 at a lower end in the figure, and the electrode rod 1 is provided so that the lower end side (tip side) of the casing 2 projects downward from the opening 22 of the casing 2. . The upper end (base end) of the electrode rod 1 is supported by a casing 2 via an insulating material (not shown) and a self-aligning ball bearing 4, while an intermediate portion thereof is supported by an eccentric rotator 24. Have been. This eccentric rotator 24 is a cylindrical rotator 2
3, an eccentric ring 9 fitted and fixed to the inner peripheral surface of the rotating body 23, and an eccentric inner peripheral surface of the eccentric ring 9 fixed to the eccentric inner peripheral surface via an insulating material (not shown). And a ball bearing 10 to be inserted. The eccentric rotator 24 is rotatably supported at its upper and lower ends by two annular support members, that is, a first ball bearing 7 and a second ball bearing 8. Among them, the second ball bearing 8 has a shielding function for a shielding gas described later. The toothed portion 6 for the toothed belt formed on the outer peripheral surface of the rotating body 23 and the output shaft 2 of the motor 3
A power transmission mechanism is configured via a toothed pulley 5 and a toothed belt (not shown) attached to the power transmission mechanism 5.

Further, a power supply cable and various hoses necessary for welding are connected to the upper end of the electrode rod 1. Further, the electrode rod 1 is provided with a disc-shaped sealing plate (shielding member) 14 at an intermediate portion on the lower end side of the eccentric rotator 24,
A ring-shaped sliding plate 15 and a sliding plate 16 are provided on the inner peripheral surface of the casing 2 on the opening 22 side. A sliding groove 17 is formed on the inner peripheral surface of the casing 2 so as to be sandwiched between the two sliding plates 15 and 16, and the peripheral edge of the seal plate 14 is fitted into the sliding groove 17 so as to be slidable. I have. The seal plate 14 and the slide plates 15 and 16 are made of heat-resistant synthetic resin. A shield gas is circulated through the electrode rod 1 from the upper end to the lower end. The electrode rod 1 is provided at a position slightly above a power supply tip 27 provided at the lower end thereof with an ejection hole 26 for ejecting the shield gas during welding to perform arc welding of a shield gas method. At the intermediate portion between the ball bearings 8 and 10 and the seal plate 14, a blowout hole 11 for blowing out a part of the shield gas flowing through the electrode rod 1 is provided.

When the motor 3 operates in the above-described high-speed rotary arc welding apparatus, the rotation of the output shaft 25 causes the eccentric rotating body 24 to rotate via the toothed pulley 5 and the toothed belt (not shown).
Is transmitted to Then, the lower end side of the electrode rod 1 is supported by the self-aligning ball bearing 4 by the ball bearing 10 incorporated in the eccentric rotator 24, and circular movement is performed about the rotation axis 28 with the fulcrum as a fulcrum. . As a result, rotation is given to the welding arc, and at the same time, a shield gas is blown out from the jet holes 26 to perform high-speed rotation arc welding of a shield gas method. At this time, spatters and fumes are generated from the welding points. However, since the sliding groove 17 and the shield plate 14 whose peripheral edge is fitted into the sliding groove 17 are provided on the opening 22 side of the casing 2, The penetration of the spatter into the casing 2 is prevented by the sliding groove 17 and the shield plate 14. That is, the sliding means 17 and the shield plate 14 constitute the shielding means 30 against spatter. However, since the electrode rod 1 makes a rubbing motion, it cannot be completely prevented by the above-mentioned shielding means 30 alone.

The ball bearings 8 and 10 of the eccentric rotor 24
Has a shielding function for shielding gas as described above. Therefore, in the casing 2, a gas chamber 50 is formed between the shielding means 30 and the ball bearings 8, 10. Since the electrode rod 1 is provided with the shield gas blowing hole 11 facing the inside of the gas chamber 50, the gas chamber 50 is filled with the shield gas at a pressure higher than the atmospheric pressure. Since the shield plate 14 slides following the sliding motion of the electrode rod 1, the above-mentioned airtightness between the shield plate 14 and the slide groove 17 is not always perfect. However, as described above, the gas chamber 50 that fills the shielding gas at a pressure higher than the atmospheric pressure is provided by the shielding means 30 and the ball bearings 8 and 1.
0, the gas chamber 50
This reliably prevents fumes from entering the rotating body 24 in the casing 2. Further, it is possible to suppress the invasion of foreign matter due to a temperature change during welding and when welding is stopped.

[0019]

In the high-speed rotary arc welding apparatus according to the first aspect of the present invention, a gas chamber for filling a gas with a pressure higher than the atmospheric pressure is formed on the opening side of the eccentric rotary body. It is possible to reliably prevent fume intrusion. In addition, since a part of the shield gas flowing through the electrode rod flows out of the electrode rod and fills the chamber, the configuration can be made very simple.

In the high-speed rotating arc welding apparatus according to the second aspect, it is possible to prevent the invasion of spatter into the casing by the shielding means, and at the same time, to configure the gas chamber at the casing opening side with respect to the gas chamber. Becomes Therefore, the configuration can be simplified.

Further, in the high-speed rotary arc welding apparatus according to the third aspect, it is possible to support the eccentric rotary body by the annular support member and, at the same time, configure the gas shield of the gas chamber on the side opposite to the casing opening. . Therefore, the configuration can be further simplified.

In the high-speed rotating arc welding apparatus according to claim 4,
Although having a simple configuration, it is possible to reliably prevent the intrusion of spatter into the casing and to suppress the intrusion of fume.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a high-speed rotating arc welding apparatus of the present invention.

FIG. 2 is a longitudinal sectional view showing a conventional high-speed rotating arc welding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode rod 2 Casing 8 2nd ball bearing 11 Blow-out hole 14 Seal plate 17 Sliding groove 22 Opening 24 Eccentric rotating body 30 Shielding means 50 Gas chamber

Claims (4)

[Claims] A casing having one end opened; an electrode rod having a tip facing outside through the casing; and an eccentric rotator rotatably supported and rotatably supported within the casing. The eccentric rotating body supports the intermediate portion of the electrode rod and provides a circular motion to the welding arc generated on the distal end side of the electrode rod while the base end side of the electrode rod is a fulcrum. In a high-speed rotating arc welding apparatus in which a shield gas is circulated from a base end side to a front end side, and this shield gas is blown out from a front end side of the electrode rod to perform a shield gas type arc welding, the electrode rod is disposed at an intermediate position. The casing is provided with a blowout hole for blowing a part of the shield gas, and the casing on the opening side of the eccentric rotor is filled with the shield gas blown out from the blowout hole at a pressure higher than the atmospheric pressure. A high-speed rotating arc welding apparatus characterized by forming a gas chamber to be filled. 2. A sliding groove provided on an inner side surface of the casing and provided on an electrode rod on a tip end side of the eccentric rotating body, and a peripheral edge thereof is slidably fitted into the sliding groove. 2. The high-speed rotating arc welding apparatus according to claim 1, further comprising shielding means comprising a shielding member. 3. The eccentric rotator is rotatably supported in the casing by an annular support member having a shielding gas shielding function interposed between the eccentric rotator and the casing. The high-speed rotating arc welding apparatus according to claim 2. 4. A casing having an opening at one end, an electrode rod having a tip facing outward from the opening of the casing, an eccentric rotator rotatably supported and rotatably supported within the casing. A high-speed rotating arc welding apparatus that provides a circular motion to a welding arc generated on the distal end side of the electrode rod by supporting the intermediate portion of the electrode rod by the eccentric rotating body with the base end side of the electrode rod as a fulcrum, A sliding groove is provided on the inner surface of the casing, and a shielding member is provided on the electrode rod on the tip side with respect to the eccentric rotating body, and a peripheral edge thereof is slidably fitted in the sliding groove. A high-speed rotating arc welding apparatus provided with shielding means.