JP2002346760A - Rotary electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electrode in which a rotary a table electrode is rotatable. SOLUTION: The rotary electrode comprises a frame 31, a table 41 which is installed on an upper part of the frame 31 with a gas feed hole formed therein, and a rotary table electrode 43 installed on the table 41 covering the gas feed hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electrode, and more particularly, to a rotating electrode usable for a table electrode mechanism for a spot welding machine.

[0002]

2. Description of the Related Art Conventionally, a table electrode has been fixed to a table installed at the center of a spot welder. Therefore, when adjusting the positional relationship between the work piece on the table electrode and the spot gun, the vertical column supporting the spot gun is moved to the left or right, or the worker moves the work piece directly to Was done by changing. In addition, it is not easy to change the front and back surfaces of a table electrode fixed to a conventional table.

[0003]

However, in a conventional spot welding machine in which a table electrode is fixed to a table, when changing the direction of a workpiece during welding, an operator directly manipulates the workpiece by hand. It is necessary to change the direction by moving, and there is a problem that the working efficiency is reduced and the product may be damaged.

Further, conventionally, even when the surface of the table electrode is worn, it is not easy to turn the table electrode upside down and use the back surface because the table electrode is fixed to the table.

[0005]

Means for Solving the Problems The present invention provides a gantry,
A gas supply hole is provided on the upper surface which is installed on the gantry, and a table in which gas is supplied to the gas supply hole, and a rotary table electrode which is provided with the gas supply hole covering the table is provided. To provide a rotating electrode.
Then, gas is pressurized and injected into gas supply holes provided on the table to float the rotary table electrode. for that reason,
The rotating table electrode is in a non-contact, no-load state, and is easy to rotate. Further, when the gas passes below the rotary table electrode, the rotary table electrode is cooled, and during welding, the resistance at the time of energization is reduced, thereby improving welding conditions and preventing the rotary table electrode from warping. Further, since the rotating table electrode is not fixed to the table, the rotating table electrode can be easily turned over, and both sides can be used.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a side view of a spot welding machine using a rotating electrode according to the present invention, FIG. 2 shows a front view thereof, FIG. 3 shows a plan view thereof, and FIG. 5, FIG. 5 showing a side view seen from the direction of the arrow A in FIG. 4, FIG. 6 showing an enlarged sectional view of the central part of FIG. 5, FIG. 7 showing a partially enlarged side view of the cam follower, FIG. FIG. 8 showing a side view of the jig, FIG. 9 showing a front view of the hanging jig for electrode replacement, FIGS. 10A and 10 showing a table provided with gas supply holes.
This will be described with reference to (b), FIG. 10 (c) and FIG.

Reference numeral 11 denotes a spot welding machine main body. The spot welding machine body 11 has a square shape in plan view. Reference numeral 12 denotes an arm whose base is attached to the head of the spot welding machine main body 11. Air cylinder 13 at the tip of arm 12
Is attached. The arm 12 is attached via a rotation shaft, and the air cylinder 13 can be moved along the XY plane by the arm 12. Reference numeral 14 denotes a column attached to a lower portion of the air cylinder 13. The rod at the tip of the air cylinder 13 can expand and contract in the vertical direction.

Reference numeral 21 denotes a movable spot gun. The movable spot gun 21 is rotatably attached to a rotating shaft 22 provided at a lower end of the column 14. A handle 23 and a shank 24 are respectively attached to the front and rear ends of the movable spot gun 21. The shank 24 includes a shallow shank 24 having a small amount of bending at the tip and a deep shank 24 having a large amount of bending at the tip, and can be replaced and attached. A welding tip 25 is attached to the tip of the shank 24, respectively.

Reference numeral 31 denotes a gantry. The gantry 31 is screwed into a trapezoidal screw installed vertically in the spot welding machine main body 11. The motor 32 raises and lowers the gantry 31 by rotating the trapezoidal screw. 33 is an upper support guide, 3
4 is a lower support guide. The upper support guide 33 and the lower support guide 34 are vertically spaced from each other. Both the base is fixed to the spot welding machine main body 11 and the tip is fixed to the gantry 31. Reference numeral 35 denotes a switch unit, which is attached to the side of the gantry. Reference numeral 36 denotes a foot switch, which is attached to the spot welding machine main body 11.

Reference numeral 41 denotes a table. Table 41
Is attached to the upper part of the gantry 31. Reference numeral 42 denotes a gas supply hole, and 43 denotes a rotary table electrode, which is formed of a disk having a diameter of about (50 to 100) centimeters. The rotary table electrode 43 has a gas supply hole 4
2 and installed. One or more gas supply holes 42 are provided on the table 41,
3 are arranged so as to float uniformly and stabilize. For example, as shown in FIG. 10A, when one gas supply hole 42 is provided in a circular shape, it is installed at the center of the table 41, and the rotary table electrode 43 is installed so that the center of the table 41 coincides with the center. . For example, when the gas pressure is set to about 0.4 megapascal, the circular area is set to about 20 square centimeters in order to float the rotary table electrode 43. Therefore, the rotary table electrode 43 receives air pressure at the center of the lower surface and floats uniformly to be stable. FIG. 10 (b)
As shown in (2), when four gas supply holes 42 are provided in a circular shape, the gas supply holes 42 are equally spaced from the center of the table 41, and the rotary table electrode 43 is installed so that the center of the table 41 coincides with the center. In this case, in order to float the rotary table electrode 43, each circular area is set to about 5 square centimeters. Therefore, the rotary table electrode 43 is
It receives air pressure at four places on the lower surface and floats uniformly to stabilize. Figure 1
As shown in FIG. 0 (c), when one gas supply hole 42 is provided in a ring shape, it is arranged at the center of the table 41,
The rotating table electrode 43 is installed so that the center of the rotating table electrode 43 coincides with the center of the table 41. In this case, the area of the ring is set to about 20 square centimeters in order to float the rotary table electrode 43. Therefore, the rotary table electrode 43 receives air pressure in a ring shape on the lower surface, and floats uniformly to be stable. Reference numeral 44 shown in FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. The gas supply pipes 44 are attached to the inside of the table 41 according to the number of gas supply holes 42 provided on the upper surface of the table 41. Reference numeral 45 denotes a hole, which is symmetrically provided at two places on the side surface of the rotary table electrode 43. Hole 45 is
It is used when turning the rotary table electrode 43 upside down. FIG.
Reference numeral 46 denotes a cam follower, which is a table electrode 4
A plurality of pieces are installed on the table 41 around the periphery 3 to prevent the rotating table electrode 43 from dropping from the table 41. Reference numeral 47 denotes a motor which is installed on the upper surface of the gantry 31. The motor 47 has a friction wheel 48 attached to the tip of the rotating shaft. Reference numeral 49 denotes a cylinder, which is attached to the side of the motor 47. The cylinder 49 allows the friction wheel 48 to contact the rotary table electrode 43. Reference numeral 51 shown in FIGS. 8 and 9 denotes a semicircular arm, which is installed in a work place.
The semicircular arm 51 is used when turning the rotary table electrode 43 upside down. 52 is a bolt and a semicircular arm 51
When the turntable electrode 43 is turned over, the turntable electrode 43 is passed through the hole 45 to fix the semicircular arm 51 and the turntable electrode 43. 53 is a lifting hole.
The semicircular arm 51 is provided at two places,
Use when lifting As shown in FIG. 11, a method of installing the motor 47 below the table 41 is also conceivable. In this case, the motor 47 is installed below the table 41, the rotation shaft of the motor 47 penetrates the upper surface of the table 41, and a friction wheel 48 is attached to the tip of the rotation shaft to make contact with the rotary table electrode 43. Therefore, it can be installed on the gantry 31 without taking up space.

Next, the operation of the embodiment will be described. When a normal workpiece is set on the rotary table electrode 43, the welding operation is performed using the shank 24 attached to the tip of the spot gun 21. At this time, the gantry 31 is
Is driven to a position at which the worker can easily work.

The spot gun 21 extends to the welding point of the workpiece.
Is moved, the arm 12 is moved with the rotation shaft 22 as the center of rotation to perform the operation. When the tip of the spot gun 21 has moved to the point to be welded, the welding tip 25 at the tip of the spot gun 21 is set on the point to be welded, and then the air cylinder 13 is operated to press the welding tip 25 in the direction of the gantry and simultaneously energize. And perform welding work.

When changing the horizontal direction of the work to be welded installed on the rotary table electrode 43, first, the switch unit 35 installed on the side surface of the gantry 31 is operated, and gas, in this embodiment, air And the rotary table electrode 43
From the table 41. Next, the foot switch 36 is operated by the operator's foot to bring the friction wheel 48 into contact with the rotary table electrode 43 by the cylinder 49, and the motor 47 is driven to rotate the rotary table electrode 43. At this time, the rotation of the rotary table electrode 43 changes the direction of the workpiece to a position where the worker can easily work. Then, the switch section 35 is operated to lower the rotary table electrode 43, and the welding operation is restarted. The above-described series of operations is performed each time the direction of the workpiece is changed in the lateral direction. Note that the rotary table electrode 43 can be rotated by operating a hand switch.

In this embodiment, when the gas supplied to the gas supply hole 42 is air, the air is supplied from the air supply unit while the hand switch or the foot switch 36 is operated, and the gas supply pipe 44 is closed. It reaches the gas supply hole 42 provided in the upper part of the table 41. In the gas supply hole 42, since the rotary table electrode 43 is provided on the table 41 so as to cover the gas supply hole 42, the air is pressurized and the rotary table electrode 43 floats on the table 41 by air pressure. The floating rotary table electrode 43 is brought into a non-contact, no-load state by operating the hand switch or the foot switch 36. Then
Eliminates frictional resistance and facilitates rotation. At this time, the cam follower 46 defines the installation position of the rotary table electrode 43 in the horizontal direction, and prevents the rotary table electrode 43 from dropping on the table 41.

When the turntable electrode 43 is turned over, FIG.
As shown in FIG. 9, the semicircular arm 51 and the rotary table electrode 43 installed in the work place are fixed with bolts 52, and the rotary table electrode 43 is lifted. Next, the rotary table electrode 43 is turned over, and the table 41 is again turned over.
And then loosen the bolts 52 to secure the semicircular arm 5
The work is completed by separating the rotary table electrode 43 from 1.

[0016]

According to the present invention, a gas is pressurized and injected into a gas supply hole provided on a table to float a rotary table electrode. Therefore, the rotating table electrode is non-contact,
Since there is no load, rotation is facilitated, welding work can be performed without moving an object to be welded by an operator, and an effect of improving productivity and quality can be obtained by reducing fatigue of the operator. Furthermore, the cooling effect of the rotary table electrode is obtained by the air supplied at the time of welding, the resistance at the time of energization is reduced, the welding conditions are improved and the rotary table electrode is prevented from warping. Further, since the rotating table electrode can be easily turned over, both sides can be used.

[Brief description of the drawings]

FIG. 1 is a side view of a spot welding machine according to an embodiment of the present invention.

FIG. 2 is a front view of the spot welding machine according to the embodiment of the present invention.

FIG. 3 is a plan view of a spot welding machine according to the embodiment of the present invention.

FIG. 4 is a diagram showing an operation of the motor according to the embodiment of the present invention.

FIG. 5 is a side view of the embodiment of the present invention viewed from the direction of arrow A in FIG. 4;

FIG. 6 is an enlarged cross-sectional view of a central portion of FIG. 5 according to the embodiment of the present invention;

FIG. 7 is a partially enlarged side view of the cam follower according to the embodiment of the present invention;

FIG. 8 is a side view of the hanging jig for electrode replacement according to the embodiment of the present invention.

FIG. 9 is a front view of the hanging jig for electrode replacement according to the embodiment of the present invention.

FIG. 10 (a) is a layout view of one location of a circular gas supply hole according to the embodiment of the present invention; and (b) four circular gas supply holes according to the embodiment of the present invention.
(C) Arrangement diagram of ring-shaped gas supply holes according to the embodiment of the present invention

FIG. 11 is an installation example diagram of a motor according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 spot welding machine main body 12 arm 13 air cylinder 14 support 21 movable spot gun 22 rotating shaft 23 handle 24 shank 25 welding tip 31 gantry 32 motor 33 upper support guide 34 lower support guide 35 switch section 36 foot switch 41 table 42 gas supply Hole 43 Rotary table electrode 44 Gas supply pipe 45 Hole 46 Cam follower 47 Motor 48 Friction wheel 49 Cylinder 51 Semicircular arm 52 Bolt 53 Lifting hole

Claims (1)

[Claims] 1. A gantry, a table provided on an upper portion of the gantry and having a gas supply hole provided on an upper surface, and a gas supplied to the gas supply hole, and a rotary table provided on the table so as to cover the gas supply hole. A rotating electrode comprising: an electrode.