KR101433103B1

KR101433103B1 - Apparatus For Changing Tips Of Welding Gun

Info

Publication number: KR101433103B1
Application number: KR1020140037693A
Authority: KR
Inventors: 임종찬
Original assignee: (주) 에이트론
Priority date: 2014-03-31
Filing date: 2014-03-31
Publication date: 2014-08-25

Abstract

The present invention relates to an apparatus for replacing a tip of a welding gun, capable of mechanically replacing a disposable tip installed on an end portion of the welding gun in a robot welding device for performing spot welding. The apparatus for replacing a tip of a welding gun includes a main plate (5) mounted on a top surface of a base assembly in parallel to the ground surface; a tip mounting part (11) mounted on the main plate (5) and having first tip fitting holes (13) vertically perforated so that fingers (101,103) of a welding gun (100) are fitted into the first tip fitting holes (13); a clamping unit for pressing surfaces of the tips (111, 113) of the welding gun fitted into the first tip fitting holes (13) of the tip mounting part (11) to grasp the tips (111,113); a tip rotating unit for rotating the tips (111, 113) about an axis (X) vertical to the main plate (5) in a state where the clamping unit clamps the tips (111,113); and a main plate lifting unit interposed between the main plate (5) and the base so that one side of the main plate (5) is lifted at a predetermined angle with respect to the top surface of the base assembly.

Description

[0001] Apparatus For Changing Tips Of Welding Gun [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip changing apparatus for a welding gun, and more particularly, to a tip changing apparatus for a welding gun that enables mechanical replacement of a consumable tip provided at the end of a welding gun in a robot welding machine for spot welding.

Robot welders are widely used for welding between steel plates in an automobile body welding line or for spot welding between steel plates and structural members. Robot welder is an essential equipment because it can perform various motions according to program and can work quickly. The tip of the welding gun of the robot welder is fitted with a tip. The tip is a consumable product that needs to be replaced periodically because it is worn according to usage because it is a discharge area. For reference, cooling water is supplied to cool the tip inside the welding gun.

The fingers of the tip and weld gun are press-fit to allow easy replacement. That is, in the conventional welding gun, tapers are formed on the outer peripheral surface of the finger of the welding gun and the inner peripheral surface of the tip hole. Therefore, when the tips of the welding gun are inserted into the fingers, they are tightly coupled, and when the tip is rotated a little, they are easily separated.

Since the replacement work of the tip is not so difficult, conventionally, it has been dependent on the manual operation of the operator. However, since the position where the welding gun is installed is often cramped, it is difficult to replace it by hand, and the tip replacement work is usually performed during the break time set during normal work hours for continuity of the work, .

The conventional tip exchanging device has a complicated configuration and requires a large installation cost, and thus it is not widely used.

Korean Patent Application No. 10-2012-0073461 Korean Patent Application No. 10-2012-0083701

SUMMARY OF THE INVENTION An object of the present invention is to provide a tip replacement apparatus for a welding gun which can mechanically exchange a consumable tip provided at the end of a welding gun in a robot welding machine for performing spot welding. More specifically, it is easy to install in a narrow place due to its simple structure, low installation and maintenance costs, small size, and flexibility that corresponds to the movement of the robot, And to provide a gun tip exchange apparatus.

The above object can be accomplished by providing a plasma processing apparatus comprising: a main plate disposed on an upper surface of a base assembly in parallel with a ground; A tip seat installed on the main plate and having a first tip fitting hole formed to penetrate in a vertical direction so that fingers of the welding gun can be fitted; Clamping means for pressing and grasping the surface of the tip of the welding gun fitted in the first tip fitting hole of the tip seat; A tip rotating means for rotating the tip about an axis perpendicular to the main plate in a state where the clamping means clamps the tip; A main plate lifting unit installed between the main plate and the base assembly so that one side of the main plate is lifted at an angle with respect to the upper side of the base assembly;
The tip of the tip of the welding gun can be exchanged.

According to an aspect of the present invention, the clamping means and the tip rotating means comprise:

A first elongated hole having a circular arc shape centered on the axis X and a second elongated hole formed in a center of the first elongated hole, A rotating table provided with a second tip fitting hole into which fingers of the welding gun are fitted;

A first fixing pin fixedly installed on the main plate to penetrate the first long hole; A third tip-fitting hole provided on the rotating table so as to be linearly movable in a first direction W1, the center of which is fitted with a finger of the welding gun, and a cam surface which is in surface contact with a side surface of the first fixing pin A cam member;

A pair of jaws installed inside the turntable so as to linearly move in opposite directions along a second direction W2 perpendicular to the first direction W1 on the turntable;

And a rotation operating mechanism provided on the main plate for rotating the rotating table;

When the swivel is rotated, the swivel is pinched to urge the outer surface of the tip fitted in the first, second, and third tip fitting holes, and further rotate the tip while pressing the tip.

According to another aspect of the present invention, the rotational operation mechanism may be a first cylinder installed on the main plate and operated by fluid pressure.

According to another aspect of the present invention,

A hinge connection part for hinge-connecting the other side of the main plate to the base assembly; One end of the main plate is rotated about the second hinge axis of the hinge connection part and one end of the main plate is connected to the base assembly so as to be inclined at a predetermined angle with respect to the upper surface of the base assembly, Two cylinders may be included.

According to another aspect of the present invention, the base assembly includes:

A base plate fixedly installed on the fixture; A first flow plate installed on an upper surface of the base plate so as to be able to flow in a first direction with respect to a center point by a first guide means; A second flow plate installed on the upper surface of the first flow plate to flow in a second direction perpendicular to the first direction with reference to the center point by a second guide means; Elastic restoring means for resiliently returning to the center point when the first or second flow plate is moved away from the center point by an external force;
A center adjustment mechanism including a center adjustment mechanism.

According to another aspect of the present invention, there is provided an electronic device including: a tip mount;

A cartridge detachably coupled to the main plate to provide a tip accommodating portion capable of vertically receiving a plurality of tips such as bullets in a magazine; A holder jig fixed on the main plate so as to be in close contact with an extension line of the cartridge and providing a tip seating part on which a tip for conveying along the tip accommodating part is seated; And a tip feeder for feeding and feeding a tip, which is inserted into a tip receiving portion of the cartridge, to a tip receiving portion of the holder jig.

According to the above configuration, the consumable tip installed at the tip of the welding machine can be exchanged without using a manual operation in an industrial facility equipped with a robot welding machine such as an automobile body welding line. Since the tip exchanging apparatus according to the present invention is small in volume, it can be conveniently installed and used in the vicinity of the welder, and the number of parts is small and the structure is not complicated, so that installation and maintenance costs are reduced, It is a structure capable of flexibly responding to movements, so that little impact and noise are generated.

1 is a perspective view of a partially disassembled state of a tip changing apparatus of a welding gun according to an embodiment of the present invention.
2 is a side view of the operating state of the tip changing apparatus of the welding gun according to the embodiment of the present invention.
3 is a schematic plan view of a tip changing apparatus of a welding gun according to an embodiment of the present invention.
4 is an exploded perspective view of a main portion of a tip changing apparatus for a welding gun according to an embodiment of the present invention.
FIG. 5 is a partially exploded perspective view of a tip changing apparatus of a welding gun according to an embodiment of the present invention, in which a cartridge represents a use state. FIG.
6 is a front structural view of a tip changing apparatus of a welding gun mainly representing a tip mounting portion according to an embodiment of the present invention.
Figs. 7 (a), 7 (b) and 7 (c) are partial cross-sectional views of the tip changing apparatus of the welding gun for explaining the step of removing the tip step by step.
8A to 8C are schematic front views of a tip changing apparatus of a welding gun for explaining the step of removing the upper tip step by step.
9A to 9E are schematic front views of a tip changing apparatus of a welding gun for explaining a process of removing the lower tip step by step.
10A to 10B are schematic front views of a tip changing apparatus of a welding gun for explaining the process of mounting the upper tip step by step.
11A to 11D are schematic front views of a tip changing apparatus of a welding gun for explaining a process of mounting a lower tip step by step.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The welding gun 100 of the welding machine is started by a robot (not shown). The welding gun 100 has a shape similar to that of the C-type clamp and the welding is performed while the fingers 101 and 103 are operated up and down. The upper finger 101 is installed in a vertical shape, but the lower finger 103 is often unsuited and installed at various angles A. The upper finger 101 is activated in the vertical direction so that the tips 111 and 113 coupled to the fingers 101 and 103 are in contact with each other.

As described above, the tips 111 and 113 can be easily detached (or separated) from the fingers 101 and 103 of the welding gun if they are slightly twisted while being tightly clamped. Further, it is firmly mounted only by press-fitting the fingers 101 and 103 with an appropriate force. The exchanging apparatus of the present invention has a construction and an action to mechanically perform such removal and mounting operations.

The tip changer of the welding gun of the present invention includes a tip remover (1) for removing a tip mounted on a welding gun, and a tip mounting part (3) for inserting tips (111, 113) into the welding gun (100). The tip attaching portion (1) and the tip attaching portion (3) are installed on the main plate (5). A main plate lifting portion 7 for lifting up the main plate 5 inclined at a predetermined angle C with respect to the ground for the case where the angles of the fingers 101 and 103 of the welding gun are not perpendicular to the ground, And a center adjustment mechanism (9) for resiliently supporting the main plate toward a specific point on the ground.

Hereinafter, each component will be described in turn. The main plate 5 is horizontally installed on the upper part of the base assembly. The base assembly may be a center adjustment mechanism (9). Hereinafter, it is referred to simply as the center adjusting mechanism 9. The center adjusting mechanism 9 is fixed in parallel with the ground.

The tip seat 11 is fixed to the main plate 5. A first tip fitting hole 13 is formed in the tip seat 11 in the vertical direction so that the fingers 101 and 103 of the welding gun can be respectively fitted in the vertical direction. The tip seat 11 is provided therein with a first space S1 for installing a swivel 15 to be described later. To this end, the tip seating base 11 is composed of an upper seating base 11a and a lower seating base 11b which are vertically fastened by bolts.

Clamping means for clamping the outer surfaces of the tips 111 and 113 of the welding gun fitted in the first tip fitting hole 13 of the tip mounting table 11 is provided on the tip mounting table 11. [ Further, tip rotating means for rotating the tip about the axis X perpendicular to the main plate 5 in a state where the clamping means clamps the tips 111 and 113 is provided.

According to the present invention, the clamping means and the tip rotating means are continuously operated by the first cylinder (17). Hereinafter, the clamping means and the tip rotating means will be described.

And the rotation table 15 is installed inside the tip seat 11 so as to be rotatable within a certain angle B range. The rotating table 15 is provided so as to be concentric with the first tip fitting hole 13 of the tip seating table 11 and is provided so that the tip can be fitted in the same way as the first tip fitting hole 13 of the tip seating table 11 And the second tip fitting hole 19 is provided in the vertical direction. The first and second tip fitting holes 13 and 19 are coincident in position and size.

The rotary table 15 is provided with an arc-shaped first long hole 21 around the axis X about the second tip fitting hole 19 in which the fingers 101 and 103 of the welding gun are inserted. The first elongated holes 21 are symmetrical with respect to one another with respect to the second tip fitting hole 19 as a reference. A first fixing pin 23 is fixed to the tip seat 11 and a roller 25 is coupled to the first fixing pin 23. The roller 25 is fitted in the first elongated hole 21 when the rotation table 15 is provided on the tip seat 11. [

And the second space S2 is also provided in the inside of the swivel 15. The second space S2 communicates with the opening 25 provided in the side wall of the swivel 15. The cam member 27 is inserted through the opening 25 and is drawn into the second space S2 inside the swivel 15. The cam member 27 is fitted in the second space S2 and is installed so as to be linearly movable in the second space S2 along the fitting direction. The cam member 27 also has a third tip fitting hole 29 in the vertical direction in which the tips 111 and 113 can be fitted. The first, second, and third tip fitting holes 13, 19, and 29 are aligned with each other so that the tips 111 and 113 can completely pass through in the vertical direction.

The cam member 27 is allowed to linearly move in a first direction W1 which is the opening direction of the second space S2 in a state of being fitted in the swivel 15. The front surface of the cam member 27 becomes a hemispherical cam surface 31 which faces the first fixing pin 23 and is supported by the roller 25. [

The cam member 27 is provided with a third space S3 opened laterally and a pair of jaws 33 and jaw are fitted to face each other in the third space S3. The jaw 33 is for pressing and clamping the outer surfaces of the tips 111 and 113 and has a plurality of teeth 35 protruding toward the center. The jaws 33 protrude in the left and right directions in the third space S, As shown in Fig. The starting direction of the bath 33 is the second direction W2 and is perpendicular to the first direction W1. The second long hole 37 is provided in the tank 33 so as to extend in an inclined direction at an angle of 45 degrees with respect to the moving direction of the tank 33. [ And a third long hole 39 for fixing the jaw 33 is provided in a direction perpendicular to the starting direction of the cam member 33. [ The second fixing pin 41 is fixed to the cam member 27 in a vertical direction so as to be fitted into the second long hole 37. [ A fourth long hole 43 is formed in the cam member 27 so as to extend in the same direction as its own starting direction W1. A third fixing pin 45, which is simultaneously inserted into and engaged with the third and fourth long holes 39 and 43, is fitted in the rotating table 15.

The rotation table 15 is rotatable about an axis X perpendicular to the surface of the main plate 5 by a rotation operation mechanism. The rotary actuating mechanism may be a first cylinder 17 operated by fluid pressure. That is, the first cylinder 17 is fixed to the main plate 5, and the piston 17a of the first cylinder 17 is connected to one side of the swivel 15 through the lever 47. The swivel 15 and the lever 47, and the lever 47 and the piston 17a are hinged to each other. It is preferable that the first cylinder 17 is also installed so as to be rotated by a slight angle about the first hinge shaft 49 with respect to the main plate 5. [

That is, the linear motion of the piston 17a by the first cylinder 17 can be converted into the rotational motion of the rotation table 15. [ The rotation angle B of the rotation table 15 may be, for example, 50 to 70 degrees.

Hereinafter, the operation of this configuration will be described.

When the first cylinder 17 is operated in a state where the tips 111 and 113 of the welding gun are fitted in the first tip fitting hole 19, the rotation table 15 is rotated about the axis X. [ The cam member 27 rotates together with the rotation table 15 until the rotation axis 15 rotates by an angle L of 25 to 35 degrees and at the same time the cam plane 31 of the cam member 27 rotates together with the first fixing pin 23 The roller 25 is pushed in the arrow direction along the first direction W1 in accordance with the rolling contact. This is because the first fixing pin 23 is fixedly installed independently of the rotating table 15.

The jaws 33 can not move along the cam member 27 together with the third elongated hole 37 and the third elongated hole 39 in the third elongated hole 39, And is advanced toward the tips 111 and 113 in the second direction W2. As a result, the teeth 35 of the jaws pierce the tips 111 and 113 to a predetermined depth and force their sides strongly.

In this state, if the turntable 15 is further rotated by a further rotatable angle M, for example, 25 to 35 degrees, the turntable 33 is rotated together with the turntable 15 in a state of pressing the tips 111 and 113 do. In this way, the tips 111 and 113 are separated from the fingers 101 and 103 of the welding gun by rotating the turntable 15 with the first cylinder 17.

According to another aspect of the present invention, the main plate 5 is installed on the upper surface of the center adjusting mechanism 9 for providing a mounting plane parallel to the ground.

According to the present invention, a center adjustment mechanism is used, which provides a structure in which the flow plate body 51 is installed to be movable in a state of being mounted on the upper surface of the base plate 53. The base plate 53 is fixed at a point where the welding gun 100 can approach. The fluid plate 51 is always elastically supported at a specific point on the base plate 53, in particular, toward the center point. Such a configuration is described in detail in Patent Registration No. 10-1160608 filed by the inventor under the name "center adjustment mechanism " However, the "center adjustment mechanism" can be used in the present invention, and this is not necessarily used. In other words, other careful devices known in the art for performing similar operations may be used.

The center adjustment mechanism (9) includes a base plate (53) fixedly installed on the fixture; A first flow plate (51a) installed on an upper surface of the base plate (53) so as to be able to flow in a first direction (W1) with respect to a center point by a first guide means; (51b) provided on the upper surface of the first flow plate (51a) so as to flow in a second direction (W2) perpendicular to the first direction (W1) with respect to the center point by a second guide means ); And elastically returning means for elastically returning to the center point when the first flow plate (51a) or the second flow plate (51b) is moved away from the center point by an external force. Even when the fingers 101 and 103 of the welding gun 100 are inserted into the first tip fitting hole 13 at the same position as the center of the tip 111 and 113 of the welding gun 100, So that the tip 111, 113 can be removed or mounted while the position is adjusted.

The main plate 5 may be installed on the upper surface of the center adjusting mechanism 9 by the main plate elevating portion 7 so that one side thereof is lifted to the first angle C. The hinge connection part (55) hinges the main plate (5) and the center adjustment mechanism (9). The lifting means is such that the main plate 5 is rotated about the second hinge axis 57 of the hinge connection portion 55 and is inclined at a first angle C with respect to the plane of installation of the center adjustment mechanism 9, And may be a cylinder 59. One end of the second cylinder (59) is connected to the center adjusting mechanism (9) and the other end is hinged to the bottom surface of the main plate (5). The first angle C should be determined according to the inclination angle of the lower finger 103 of the welding gun. The stopper 60 is installed upright on the center adjusting mechanism 9 so as to limit the inclination of the main plate 5. [ The length of the stopper 60 can be adjusted.

On the other hand, the main plate 5 is provided with a tip mounting portion 3 for fitting the tips 111 and 113 into the fingers 101 and 103 of the welding gun. Hereinafter, the tip mounting portion 3 for supplying and loading the tips 111 and 113 to the second holder jig 29 will be described.

The tips 111 and 113 are supplied to the holder jig 63 while being sequentially transported along the extending direction of the cartridge 61 installed in a vertically symmetrical manner in a cross-sectional view similar to the (E) character. The cartridge 61 provides a tip receiving portion 65, 65 'capable of receiving a plurality of tips 111, 113 in the form of bullets in the magazine. A fitting groove 62 for coupling with the main plate 5 is provided between the upper tip accommodating portion 65 and the lower tip accommodating portion 65 '. The cartridge 61 can be manufactured by injection molding and is detachably coupled to the main plate 5. Accordingly, the operator can insert the tips 111 and 113 in advance into the tip accommodating portions 65 and 65 ', and replace the cartridge 61 as if the currently installed tips are exhausted. The main plate 5 is provided with a fitting base 6 to be fitted into the fitting groove 62 of the cartridge 61. Although not shown, a locking means (for example, a magnet or the like) may be provided to allow the cartridge 61 to 'snap' and be fitted and fixed to the main plate 5 and separated only by force, Guide means (e.g., by a groove and a projection) may be provided so as to be coupled to each other. The cartridge 61 is provided with pin guide grooves 73 and 73 'to which the push pins 71 and 71' to be described later can be inserted laterally.

The third cylinder 67 provides power for feeding the tips 111 and 113 to the loading position. The third cylinder 67 is fixed to the main plate 5 and is connected to a push pin 71 which is movable along the cartridge 61 via a moving block 68. The push pins 71 start along the pin guide grooves 73 and 73 'provided on the upper and lower portions along the cartridge 61, respectively. On the extension of the pin guide grooves 73 and 73 ', a holder jig 63 fixed to the main plate 5 is positioned. The holder jig (63) provides tip seating portions (66, 66 ') that are open in the vertical direction. The tips 111 and 113 which run along the pin guide grooves 73 and 73 'stand by in the state of being fitted in the tip seating portions 66 and 66' and are coupled to the fingers 101 and 103 of the welding gun.

The tip feeder feeds and feeds the tips fitted in the tip receiving portions 65 and 65 'of the cartridge to the holder jig 63 and includes the third cylinder 67 and the like.

When the third cylinder 67 is operated, the third cylinder 67 main body and the moving block 68 linearly move along the guide rods 69 and 70 as indicated by a dot-dash line. The movable block 68 is provided with push pins 71 and 71 'vertically. The push pins 71 and 71 'push the tips 111 and 113 in the cartridge 61 one after another into the tip seating portions 66 and 66'. A long guide hole 75 is provided along the extending direction of the cartridge 61 so that the main plate 5 can be operated together with the upper and lower push pins 71 and 71 'connected to each other. The manner in which the tips 111 and 113 mounted on the cartridge 61 are sequentially supplied to the tip seating portions 66 and 66 'may be variously adopted and various known methods may be used. For example, a rodless cylinder may be used as shown, or an electric motor may be used.

The fingers 101 and 103 of the welding gun are engaged with the tips 111 and 113 while being vertically inserted into the tip seating portions 66 and 66 '. A fixing ball (not shown) may be installed so as to protrude from the inner circumferential surface of the lower tip seating portion 66 'so that the loaded lower tip 113 does not fall by its own weight.

8A, 8B and 8C are side views showing steps of removing the upper tip 111 from the welding gun in a stepwise manner. When the welding gun is lowered by the robot and the upper tip 111 is fitted in the first tip fitting hole 13 (see Fig. 8A), the first cylinder 17 is operated to rotate the turntable 15, (See Fig. 8B) by clamping the upper tip 111 and simultaneously rotating it. When the welding gun 100 is removed from the first tip fitting hole 13 and the first cylinder 17 is returned to the original position and the tub 33 is removed from the upper tip 111, And falls below the plate 5 (see Fig. 8C).

9A, 9B, 9C, 9D and 9E are side views showing steps of removing the lower tip 113 from the welding gun 100 in steps. The main plate lifting portion 7 actuates the second cylinder 59 to raise one side of the main plate 15 at an angle corresponding to the tilt angle of the lower finger 103 (see FIG. 9A).

When the welding gun 100 is raised by the robot and the lower tip 113 is fitted in the first tip fitting hole 13 (see Fig. 9B), the first cylinder 17 is operated to rotate the turntable 15 The jaw 33 causes the lower tip 113 to be clamped and rotated simultaneously to detach the lower tip 113 (see Fig. 9C). When the welding gun 100 is removed from the first tip fitting hole 13 and the first cylinder 17 is operated to separate the tub 33 from the upper tip 111, (See Fig. 9D). After the welding gun 100 is separated, the second cylinder 59 is returned to the original state, and the main plate 5 is returned to the horizontal state again (see FIG. 9E).

Hereinafter, the process of mounting the tips 111 and 113 to the welding gun 100 will be described step by step.

Figs. 10A and 10B show the step of mounting the upper tip 111. Fig. The tips 111 and 113 are respectively supplied to the tip seats 66 and 66 '. The main plate 5 is maintained in a horizontal state, and tips 111 and 113 are supplied to the tip seating portions 66 and 66 ', respectively (see FIG. 10A). When the welding gun 100 operates in the downward direction and the upper finger 101 is pulled into the upper tip seating portion 66, the upper tip 101 is engaged with the upper tip 111 (FIG. The welding gun 100 is again returned to the position of FIG. 10A.

11A, 11B, 11C and 11D show the step of mounting the lower tip 113. Fig. The lower finger 103 is inclined at a predetermined angle A and the main plate 5 is inclined at the same angle C as the angle A by the main plate lifting portion 7 (Figure 11A) . In this state, the welding gun 100 is vertically raised so that the lower finger 103 is engaged with the lower tip 113 fixed to the lower tip seating portion 66 '(FIG. 11B). The welding gun 100 vertically descends and returns to the original state when the main plate 5 is inclined (Fig. 11C). Then, the main plate 5 is restored to the horizontal state again (FIG. 11D).

The configuration shown and described above is merely a preferred embodiment based on the technical idea of the present invention. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. And each of the embodiments described above can be used in various combinations and where necessary. Therefore, an optional combination of embodiments not mentioned above should also be construed as being included within the scope of the present invention.

1: reject tip 3: tip mount
5: main plate 7: main plate lift portion
9: center adjusting mechanism (base assembly) 11:
13, 19, 29: first, second, and third tip fitting balls 15:
17, 59, 67: 1st, 2nd and 3 cylinders 21, 37, 39, 43: 1st,
23, 41, 45: first, second and third fixing pins 31:
33: jaw 35: teeth
47: Lever 49,57: 1st and 2nd hinge shafts
51: flow plate 53: base plate
55: hinge connector 61: cartridge
63: holder jig 65, 65 ': tip accommodating portion
66, 66 ': Tip seating part 69: Push rod
71,71 ': Push pin 73: Pin guide groove
75: Guide ball

Claims

A main plate (5) installed on an upper surface of the base assembly so as to be parallel to the ground; A tip seating table 11 installed on the main plate 5 and having a first tip fitting hole 13 formed in a vertical direction so as to fit the fingers 101 and 103 of the welding gun 100; Clamping means for pressing and gripping the surfaces of the tips (111, 113) of the welding gun fitted in the first tip fitting hole (13) of the tip seat (11); Tip rotating means for rotating the tip (111, 113) about an axis (X) perpendicular to the main plate (5) while the clamping means clamps the tips (111, 113); A main plate lifting unit installed between the main plate 5 and the base assembly so that one side of the main plate 5 is lifted at an angle with respect to the upper side of the base assembly;
Wherein the tip of the tip of the tip of the welding gun is connected to the tip of the tip of the welding gun.

The method according to claim 1,
The clamping means and the tip rotating means,
The main plate 5 is mounted on the main plate 5 so as to be rotatable in a predetermined angular range about an axis X perpendicular to the plane of the main plate 5 and has an arcuate shape And a second tip fitting hole 19 into which the first long hole 21 of the welding gun and the fingers 101 and 103 of the welding gun are fitted;
A first fixing pin (23) fixed to the main plate (5) to penetrate the first long hole (21); A third tip fitting hole 29 is formed in the center of the swivel 15 so that the fingers 101 and 103 of the welding gun can be inserted into the swivel 15 so as to be linearly movable in the first direction W1, A cam member (27) for providing a cam surface (31) to be in surface contact with a side surface of the cam member (23);
And a pair of jaws 33 and 33 disposed inside the swivel 15 so as to linearly move in opposite directions along a second direction W2 perpendicular to the first direction W1 on the swivel 15 );
And a rotation operating mechanism provided on the main plate 5 to rotate the rotating table 15;
When the swivel 15 is rotated, the tank 33 is pinched to urge the outer surfaces of the tips 111 and 113 fitted in the first, second and third tip fitting holes 13, 19 and 29, And further performs an operation of rotating the tip (111, 113) while pressing the tips (111, 113).

3. The method of claim 2,
Wherein the rotation operating mechanism is a first cylinder (17) installed in the main plate (5) and operated by fluid pressure.

The apparatus according to claim 1, wherein the main plate lifting portion (7)
A hinge connection part for hinge-connecting the other side of the main plate 5 and the base assembly; And a second cylinder (59) operated by fluid pressure, one end of which is connected to the base assembly and the other end of which is connected to one side of the bottom surface of the main plate (5).

The apparatus of claim 1, wherein the base assembly comprises:
A base plate 53 fixedly installed on the fixture; A first flow plate (51a) installed on an upper surface of the base plate so as to be able to flow in a first direction with respect to a center point by a first guide means; A second flow plate (51b) installed on the upper surface of the first flow plate (51a) so as to flow in a second direction perpendicular to the first direction with reference to the center point by a second guide means; Elastic restoring means for resiliently returning to the center point when the first flow plate (51a) or the second flow plate (51b) is moved away from the center point by an external force;
And a center adjuster for adjusting the tip of the welding gun.

The apparatus of claim 1, further comprising: a tip mount;
A cartridge (61) detachably coupled to the main plate (5) by providing a tip accommodating portion (65, 65 ') capable of vertically receiving a plurality of tips (111, 113). The tip seating portions 66 and 66 ', which are fixedly mounted on the main plate 5 so as to be in close contact with the extended line of the cartridge 61 and on which the tip for conveying along the tip accommodating portions 65 and 65' A holder jig (63) for providing the holder (63); And a tip transporting part for transporting and feeding a tip, which is fitted in the tip accommodating part (65, 65 ') of the cartridge, to the tip seating part (66, 66') of the holder jig (63) Tip exchange device.