JP3665947B2 - Gas shield consumable electrode type rotary arc welding torch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating mechanism of a rotating arc welding torch used for gas arc consumable electrode type rotating arc welding, for example.
[0002]
[Prior art]
For example, Japanese Patent Application Laid-Open No. 62-104684 discloses a technique in which a welding arc makes a circular motion by causing a precession of an electrode of a welding torch. The configuration is such that the upper part of the electrode is supported by a self-aligning ball bearing, the middle part of the electrode is supported by an eccentric ring via a self-aligning ball bearing, and the gear mechanism attached to the eccentric ring is driven by a motor. To do.
[0003]
In the above rotating arc welding torch, when the eccentric ring is rotationally driven by a motor, the electrode precesses with the self-aligning ball bearing on the upper side as a fulcrum, so that the welding arc generated at the tip of the welding wire is a predetermined amount. Make a circular motion with a diameter. This enables so-called high-speed rotating arc welding that enables welding while rotating the welding arc at a high speed.
[0004]
[Problems to be solved by the invention]
However, in the conventional rotary arc welding torch as described above, since the electrode is long and the arc rotation diameter adjusting mechanism is a gear mechanism that transmits the rotation of the motor, the apparatus becomes large, so there is room for improvement.
Therefore, in order to reduce the size and weight of the rotating torch, Japanese Unexamined Utility Model Publication No. 1-08881 discloses a gear mechanism that transmits the rotation of the motor. In this configuration, the rotary motor and the eccentric ring are arranged in-line, and the lower part of the electrode is supported by the self-aligning ball bearing, and the upper part of the electrode is supported by the eccentric ring via the self-aligning ball bearing.
[0005]
However, in the configuration in which the self-aligning bearing is provided by the self-aligning bearing at the electrode end and the self-aligning bearing serving as a fulcrum is disposed at the intermediate portion of the electrode, there is a limit to shortening the electrode length, Arrangement including connection of welding wires, shield gas, and cable hoses for supplying welding current is difficult, and further improvement in the size and weight reduction of the rotating torch has been demanded.
[0006]
The present invention has been made in order to solve the above-described problems, and an object of the present invention is to obtain a small, lightweight rotary arc welding torch capable of shortening an electrode and easily attaching cables and hoses.
[0007]
[Means for Solving the Problems]
(1) A gas shield consumable electrode type rotary arc welding torch according to the present invention includes an electrode having a hole for supplying a welding wire at the center thereof,
A welding wire supplied from the upper end of the electrode through the hole of the electrode;
A spherical bearing for the circular motion rotatably supports a base end portion of the electrode,
A rotary motor;
An eccentric shaft to which rotation of the rotary motor is transmitted;
A self-aligning bearing block in which an eccentric portion at the tip of the eccentric shaft is inserted to generate a circular motion;
A connection plate fixed to the self-aligning bearing block and transmitting the circular motion to the spherical bearing;
The arc is rotated by the precession that occurs in the electrode ,
The connecting plate extends in a direction parallel to the axis of the electrode;
The welding wire is drawn out from between a base end portion of the electrode and the self-aligning bearing block in a direction inclined with respect to the axis of the electrode .
(2) an electrode having a hole for supplying a welding wire at the center;
A welding wire supplied from the upper end of the electrode through the hole of the electrode;
A spherical bearing that supports the base end of the electrode in a freely circular motion;
A rotary motor;
An eccentric shaft to which rotation of the rotary motor is transmitted;
A self-aligning bearing block in which an eccentric portion at the tip of the eccentric shaft is inserted to generate a circular motion;
A connection plate fixed to the self-aligning bearing block and transmitting the circular motion to the spherical bearing;
The arc is rotated by the precession that occurs in the electrode,
The rotary motor is mounted at a position where its axis is inclined with respect to the axis of the electrode.
(3) Further, the rotary motor is connected to the eccentric shaft by a flexible shaft.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a front sectional view showing Embodiment 1 of the present invention. This Embodiment 1 shows an example of a welding torch used for high-speed rotating arc welding, and the arc rotating speed varies depending on the setting parameters of welding, but at a high speed of 2 Hz or more, sometimes 10 to 150 Hz. Although it is rotated, it is set as needed. Reference numeral 1 denotes an electrode, which is formed in a thick tubular tube having a hole in the center, and is an intermediate portion from an opposite end portion (hereinafter referred to as a base end portion) that is separated from a side where an arc is generated with a workpiece (not shown). In addition, a plurality of small holes 1a communicating with the central hole are provided in a plurality of stages at positions that do not radially interfere with the annular cavity. Reference numeral 2 denotes a spherical bearing, which has an electrode 1 penetrating through the center of a spherically formed inner ring 2a to support a base end portion, and an inner flange that protrudes in a direction perpendicular to the central axis of the electrode 1 to the inner ring 2a. Provided. The base end portion of the electrode 1 is fixed to the inner ring of the spherical bearing by a snap ring or the like.
[0009]
Reference numeral 3 denotes a plurality of connecting plates made of a strip-like rigid body, one end of which is screw-joined so as to be sandwiched by two pieces around the flange of the inner ring 2a in this embodiment, and is parallel to the axis of the electrode 1 Stretched in the direction. A self-aligning bearing block 4 is arranged in a direction parallel to the axis of the electrode 1 and fixed to the other end of the connecting plate 3. Reference numeral 5 denotes an eccentric shaft, which is rotatably supported by two ball bearings. The eccentric portion at the tip is inserted into the inner ring of the self-aligning bearing 4a, and is connected to the shaft of the rotary motor 6 attached to the box of the rotation drive unit. ing.
[0010]
Reference numeral 7 denotes a cooling water channel, which includes the cylindrical cavity provided from the base end portion to the intermediate portion of the electrode 1 and an annular hole provided in the outer ring of the spherical bearing. 8 is a gas shield nozzle, 9 is a welding wire, 10 is a cooling water hose, 11 is a welding wire / shield gas supply hose, and 12 is a power cable for power supply. Reference numeral 100 denotes a cylindrical box that stores or holds the constituent members of the high-speed rotating arc welding torch.
[0011]
The cooling water hose 10 for returning the cooling water attached to the base end of the electrode 1, the welding wire 9, the welding wire / shielding gas supply hose 11 for supplying the shielding gas, and the power cable 12 for supplying the welding current , And is drawn out from between the connecting plates to the outside of the box 100 in a direction inclined with respect to the axis of the electrode 1.
[0012]
In the first embodiment configured as described above, the rotation of the rotary motor 6 is transmitted to the eccentric shaft 5, and the eccentric portion at the tip of the eccentric shaft 5 is circularly moved by the eccentric amount a via the self-aligning bearing 4a. To the connection plate 3. The connecting plate 3 precesses integrally with the electrode 1 with the spherical bearing 2 as a base point. As a result, the tip of the electrode 1 opposite to the base end performs a predetermined circular motion, so that an arc generated from the welding wire 9 fed through the center hole of the electrode 1 and extending to the tip is rotated at high speed. Can be made. In this case, the welding arc is a rotational locus that draws a perfect circle. The shielding gas is supplied from the small hole 1a through the central hole.
[0013]
The cooling water hose 10 for returning the cooling water attached to the base end of the electrode 1, the welding wire 9, the welding wire / shielding gas supply hose 11 for supplying the shielding gas, and the power cable 12 for supplying the welding current, Since it can be easily disposed outside the box 100 of the rotary drive unit from between the connecting plates, the electrode can be shortened, the hose attached to the electrode base end, the wiring position of the cables can be lowered, and the rotary torch can be reduced in size and weight. Easy.
[0014]
Embodiment 2. FIG.
FIG. 2 is a front sectional view showing Embodiment 2 of the present invention. In the figure, components having the same structure, function, etc. as those in the first embodiment are given the same reference numerals and their description is omitted. In the figure, the rotary motor 6 is attached at a position where its axis is inclined with respect to the axis of the electrode 1. Here, it is inclined about 24 °.
[0015]
Further, a cooling water hose 10 for returning the cooling water attached to the base end of the electrode 1, a welding wire 9 and a welding wire / shield gas supply hose 11 for supplying a shielding gas, and a hose such as a power cable 12 for supplying a welding current. Is taken out straight between the connecting plates in the axial direction of the electrode 1 out of the box 100 of the rotation drive unit.
[0016]
In the second embodiment configured as described above, the electrode 1 precesses and the arc generated from the welding wire 9 at the tip of the electrode 1 rotates at high speed while drawing an elliptical miracle. The amplitude in the direction orthogonal to the paper surface is the same as that in the first embodiment, but the amplitude in the paper surface direction is reduced. The axial center of the electrode 1 has an inclination angle and only transmits rotational motion to the base end portion, so that a welding torch in which the welding arc rotates on an elliptical trajectory can be easily obtained without requiring a special configuration. It is done.
[0017]
Embodiment 3 FIG.
FIG. 3 is a front sectional view showing the third embodiment. In the figure, components having structural functions equivalent to those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. Reference numeral 13 denotes a semi-automatic torch handle attached obliquely above the box 100 of the rotation drive unit, which enables semi-automation of the high-speed rotating arc welding torch. Reference numeral 14 denotes a flexible shaft connected to the eccentric shaft 5, which is connected to a remote power source.
[0018]
In the third embodiment configured as described above, the weight can be further reduced, and by simply attaching the semi-automatic torch handle 13 to the block 100, a semi-automatic torch for high-speed rotation arc welding can be easily obtained.
[0019]
【The invention's effect】
As described above, according to the present invention, in the high-speed rotating arc welding torch, the base end portion of the electrode is supported by the spherical bearing, and the circular motion is transmitted to the inner ring flange of the spherical bearing, thereby causing the electrode to precess. The welding arc is rotated , and the connecting plate extends in a direction parallel to the axis of the electrode, and the welding wire extends from between the base end of the electrode and the self-aligning bearing block to the shaft of the electrode. Since it is drawn in a direction inclined with respect to the center , the electrode can be shortened, and the welding torch can be easily reduced in size and weight.
Further, by changing the mounting angle of the rotary motor and transmitting the rotational motion to the base end part with an inclination angle with respect to the axis of the electrode 1, a welding torch that rotates the welding arc in an elliptical locus can be easily performed. can get.
In addition, it is possible to reduce the weight further by installing a rotary motor separately and rotating it with a flexible shaft. If a semi-automatic torch handle is attached to the rotary drive block, semi-automatic high-speed rotary arc welding can be easily performed. Can be a torch.
As described above, since the welding torch for high-speed rotation arc welding can be reduced in size and weight, it can be easily mounted on a welding robot.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing a first embodiment of the present invention.
FIG. 2 is a front sectional view showing a second embodiment of the present invention.
FIG. 3 is a front sectional view showing a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrode 2 Spherical bearing 3 Connecting plate 4 Self-aligning bearing block 5 Eccentric shaft 6 Rotating motor 7 Cooling water path 8 Shielding gas nozzle 9 Welding wire 10 Cooling water hose 11 Welding wire shielding gas supply hose 12 Power cable 13 Semi-automatic torch handle 14 Flexible shaft

Claims (3)

An electrode having a hole for feeding a welding wire in the center;
A welding wire supplied through the hole of the electrode from the upper end of the electrode;
A spherical bearing for the circular motion rotatably supports a base end portion of the electrode,
A rotary motor;
An eccentric shaft to which rotation of the rotary motor is transmitted;
A self-aligning bearing block in which an eccentric portion at the tip of the eccentric shaft is inserted to generate a circular motion;
A connection plate fixed to the self-aligning bearing block and transmitting the circular motion to the spherical bearing;
A gas shielded consumable electrode rotating arc welding torch to rotate the arc by precession that occurs to the electrode,
The connecting plate extends in a direction parallel to the axis of the electrode;
The gas shield consumable electrode type rotating arc characterized in that the welding wire is drawn out from between the base end of the electrode and the self-aligning bearing block in a direction inclined with respect to the axis of the electrode. Welding torch. An electrode having a hole for feeding a welding wire in the center;
  A welding wire supplied through the hole of the electrode from the upper end of the electrode;
  A spherical bearing that supports the base end of the electrode in a freely circular motion;
  A rotary motor;
  An eccentric shaft to which rotation of the rotary motor is transmitted;
  A self-aligning bearing block in which an eccentric portion at the tip of the eccentric shaft is inserted to generate a circular motion;
  A connection plate fixed to the self-aligning bearing block and transmitting the circular motion to the spherical bearing;
  A gas shield consumable electrode type rotary arc welding torch that rotates an arc by precession that occurs in the electrode,
  A gas shield consumable electrode type rotary arc welding torch, wherein the rotary motor is mounted at a position where its axis is inclined with respect to the axis of the electrode. 3. The gas shield consumable electrode type rotary arc welding torch according to claim 1, wherein the rotary motor is connected to the eccentric shaft by a flexible shaft.

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