JP4326164B2 - Rotating electrode - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating electrode, and more particularly to a rotating electrode that can be used in a table electrode mechanism for a spot welder.
[0002]
[Prior art]
Conventionally, the table electrode has been fixed to a table installed in the center of the 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 operator moves the work piece directly to Was done by changing.
In addition, it is not easy to change the front and back surfaces of the table electrode fixed to the conventional table.
[0003]
[Problems to be solved by the invention]
However, in the spot welder in which the table electrode is fixed to the conventional table, when changing the direction of the workpiece during welding, it is necessary for the operator to change the direction by moving the workpiece directly by hand. There is a problem that the work efficiency may be reduced and the product may be damaged.
[0004]
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 it is fixed to the table.
[0005]
[Means for Solving the Problems]
The present invention includes a gantry, a table provided on the upper surface of the gantry and provided with a gas supply hole on the upper surface thereof, and a gas supplied to the gas supply hole, and a rotary table electrode installed on the table so as to cover the gas supply hole A rotating electrode is provided.
Then, gas is injected under pressure into the gas supply hole provided on the table, and the rotary table electrode is floated.
Therefore, the rotary table electrode is in a non-contact and no-load state and can be rotated easily. Furthermore, when the gas passes under the rotary table electrode, the rotary table electrode is cooled, and during welding, resistance during energization is reduced, so that the welding conditions are improved and the effect of preventing the warp of the rotary table electrode is obtained. Furthermore, since the rotary table electrode is not fixed to the table, the rotary table electrode can be easily turned over, and both sides can be used.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 shows a side view of a spot welder using the rotating electrode of the present invention, FIG. 2 shows a front view thereof, FIG. 3 shows a plan view thereof, and FIGS. 4 and 4 show operations of the motor of FIG. 5 shows a side view seen from the direction of the arrow A, FIG. 6 shows an enlarged cross-sectional view of the central portion of FIG. 5, FIG. 7 shows a partially enlarged side view of the cam follower, and shows a side view of the electrode replacement hanging jig. FIG. 8 shows a front view of a hanging jig for electrode replacement, FIG. 10 shows a table provided with a gas supply hole, FIG. 10A, FIG. 10B, FIG. 10C, and a motor installation example. This will be described with reference to FIG.
[0007]
Reference numeral 11 denotes a spot welder body. The spot welder main body 11 is a square in plan view. Reference numeral 12 denotes an arm, and a base is attached to the head of the spot welder main body 11. An air cylinder 13 is attached to the tip of the arm 12. The air cylinder 13 can be moved along the XY plane by the arm 12 and the arm 12 which are attached via the rotation shaft. Reference numeral 14 denotes a support post attached to the lower portion of the air cylinder 13. The rod at the tip of the air cylinder 13 can be expanded and contracted in the vertical direction.
[0008]
Reference numeral 21 denotes a mobile spot gun. The movable spot gun 21 is rotatably attached to a rotary shaft 22 provided at the lower end of the support column 14. A handle 23 and a shank 24 are attached to the front and rear ends of the movable spot gun 21, respectively. The shank 24 includes a shallow shank 24 with a small amount of bending at the tip and a deep shank 24 with a large amount of bending at the tip, and can be exchanged and attached. A welding tip 25 is attached to each end of the shank 24.
[0009]
31 is a mount. The gantry 31 is screwed to a trapezoidal screw installed in the vertical direction inside the spot welder main body 11. The motor 32 moves the gantry 31 up and down by rotating the trapezoidal screw. 33 is an upper support guide, and 34 is a lower support guide. The upper support guide 33 and the lower support guide 34 are spaced apart from each other vertically, and the base is fixed to the spot welder 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 surface of the mount. A foot switch 36 is attached to the spot welder main body 11.
[0010]
41 is a table. The table 41 is attached to the upper part of the gantry 31. 42 is a gas supply hole, 43 is a rotary table electrode, and consists of a disk with a diameter of about (50 to 100) centimeters. The rotary table electrode 43 is installed on the table 41 so as to cover the gas supply hole 42. One or a plurality of gas supply holes 42 are provided on the table 41, and are arranged so that the rotary table electrode 43 floats uniformly and is stable.
For example, as shown in FIG. 10A, when one gas supply hole 42 is provided in a circular shape, the gas supply hole 42 is installed at the center of the table 41, and the rotary table electrode 43 is installed with the center aligned with the table 41. . For example, when the gas pressure is set to about 0.4 megapascals, 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 and is stable.
As shown in FIG. 10B, 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 with the center aligned with the table 41. The In this case, in order to float the rotary table electrode 43, the circular areas are each about 5 square centimeters. Therefore, the rotary table electrode 43 receives air pressure at four locations on the lower surface and floats uniformly and is stable.
As shown in FIG. 10C, when one gas supply hole 42 is provided in a ring shape, the gas supply hole 42 is arranged at the center of the table 41, and the rotary table electrode 43 is installed with the center aligned with the table 41. In this case, in order to float the rotary table electrode 43, the area of the ring is set to about 20 square centimeters. Therefore, the rotary table electrode 43 receives air pressure in the shape of a lower ring and floats uniformly and is stable.
44 shown in FIGS. 2, 3, 4, 5, and 6 is a gas supply pipe. The gas supply pipe 44 is attached inside 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 provided at two positions on the side surface of the rotary table electrode 43 symmetrically. The hole 45 is used when turning the rotary table electrode 43 upside down.
Reference numeral 46 shown in FIG. 7 denotes a cam follower, which is provided around the table electrode 43 at a plurality of intervals on the table 41 to prevent the rotary table electrode 43 from falling from the table 41. A motor 47 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 surface 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 the work place. The semicircular arm 51 is used when turning the rotary table electrode 43 upside down. A bolt 52 is attached to both ends of the semicircular arm 51 and passes through the hole 45 when the rotary table electrode 43 is turned over to fix the semicircular arm 51 and the rotary table electrode 43. 53 is a lifting hole. The semicircular arm 51 is provided at two locations and is used when the semicircular arm 51 is lifted.
As shown in FIG. 11, a method of installing the motor 47 under the table 41 is also conceivable. In this case, the motor 47 is installed on the lower side of the table 41, the rotation shaft of the motor 47 is passed through the upper surface of the table 41, the friction wheel 48 is attached to the front end of the rotation shaft, and is brought into contact with the rotation table electrode 43. Therefore, it can be installed without taking a place on the upper surface of the gantry 31.
[0011]
Next, the operation of the embodiment will be described. When a normal workpiece is installed 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 positioned at a height at which the operator 32 can easily work by driving the motor 32.
[0012]
When the spot gun 21 is moved to the welding point of the workpiece, the work is performed by moving the arm 12 about the rotation shaft 22 as the rotation center. When the tip of the spot gun 21 has moved to the welding point, the welding tip 25 at the tip of the spot gun 21 is placed on the welding point, then the air cylinder 13 is operated, the welding tip 25 is pressurized in the direction of the gantry, and energized simultaneously. Welding work.
[0013]
When changing the lateral direction of the workpiece to be welded installed on the rotary table electrode 43, first, the switch 35 installed on the side surface of the gantry 31 is operated to supply gas, in this embodiment, air. Then, the rotary table electrode 43 is levitated from the table 41. Next, the foot switch 36 is operated by the operator's foot so that the friction wheel 48 is brought 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 direction of the work to be welded is changed to a position where the operator can easily work by rotating the rotary table electrode 43. Then, the switch part 35 is operated to lower the rotary table electrode 43, and the welding operation is resumed. The series of operations are performed every time the direction of the workpiece is changed in the lateral direction.
The rotary table electrode 43 can be rotated by operating the hand switch.
[0014]
When the gas supplied to the gas supply hole 42 is air in this embodiment, air is supplied from the air supply unit while operating the hand switch or the foot switch 36, passes through the gas supply pipe 44, and the table 41. It reaches the gas supply hole 42 provided in the upper part. In the gas supply hole 42, since the rotary table electrode 43 is installed on the table 41 so as to cover the gas supply hole 42, air is pressurized and the rotary table electrode 43 floats on the table 41 by air pressure.
The floated rotary table electrode 43 is brought into a non-contact and no-load state by operating the hand switch or the foot switch 36. Then, there is no frictional resistance and rotation becomes easy. At this time, the cam follower 46 defines the installation position of the rotary table electrode 43 in the horizontal direction, and prevents the fall from the table 41.
[0015]
When turning the turntable electrode 43 upside down, as shown in FIGS. 8 and 9, the semicircular arm 51 and the turntable electrode 43 installed in the work place are fixed with bolts 52, and the turntable electrode 43 is lifted. Next, the turntable electrode 43 is turned over, and after being placed on the table 41 again, the bolt 52 is loosened, and the turntable electrode 43 is separated from the semicircular arm 51 to complete the operation.
[0016]
【The invention's effect】
In this invention, gas is pressurized and injected into the gas supply hole provided on the table, and the rotary table electrode is floated.
For this reason, the rotary table electrode is in a non-contact, no-load state, so it can be rotated easily and welding work can be performed without moving the work piece by the operator. The improvement effect is obtained. Further, 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 effect of preventing the warp of the rotary table electrode is obtained. Furthermore, since the rotary table electrode can be easily turned over, it can be used on both sides.
[Brief description of the drawings]
FIG. 1 is a side view of a spot welder according to an embodiment of the invention. FIG. 2 is a front view of a spot welder according to an embodiment of the invention. FIG. 3 is a plan view of a spot welder according to an embodiment of the invention. FIG. 4 is a diagram showing the operation of the motor according to the embodiment of the present invention. FIG. 5 is a side view as viewed from the direction of the arrow A in FIG. 4 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 an electrode replacement hanging jig according to the embodiment of the present invention. Side view [FIG. 9] Front view of the electrode replacement hanger according to the embodiment of the present invention [FIG. 10] (a) Arrangement of one place of the circular gas supply holes according to the embodiment of the present invention ( b) Arrangement of four circular gas supply holes according to the embodiment of the present invention ( ) [Description of symbols] installation example diagram of a motor according to an embodiment of the ring layout of the gas supply holes 11 the present invention according to an embodiment of the present invention
11 Spot Welder Main Body 12 Arm 13 Air Cylinder 14 Strut 21 Mobile Spot Gun 22 Rotating Shaft 23 Handle 24 Shank 25 Welding Tip 31 Mounting Base 32 Motor 33 Upper Support Guide 34 Lower Support Guide 35 Switch 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)

It is composed of a gantry, a table provided on the upper surface of the gantry and provided with a gas supply hole on the upper surface, gas supplied to the gas supply hole, and a rotary table electrode installed on the table so as to cover the gas supply hole. Rotating electrode characterized by

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