JP6776491B2 - Electrode tip exchange device - Google Patents

Description

The present invention relates to an electrode tip exchanging device for attaching and detaching an electrode tip attached to a shank of a spot welder.

Spot welding is widely used as one of the welding means for metal members, and some spot welders have an electrode tip attached to the shank as an electrode part, but if the electrode tip is used for a long time, the electrode tip will become Since the tip shape is deformed and worn, it becomes difficult to ensure welding quality. Therefore, when a certain processing time or a certain number of welding points is exceeded, the electrode tip is removed and replaced with a new or polished electrode tip for welding. The quality was maintained.

Conventionally, as such an electrode chip replacement device, as shown in FIG. 5, a pair of removal devices 52 mounted on the slide unit 51 are arranged vertically and mounted on the slide unit 53 to align a plurality of electrode chips. The pair of magazines 54 stored in the magazine 54 are arranged vertically adjacent to the removal device 51, the pair of electrode tips of the welding gun are removed at the same time by the removal device 1, and the electrode tips stored in the magazine 54 are attached at the same time. It was. (See Patent Document 1)

WO2008 / 062549

In the above case, a magazine in which a plurality of electrode chips are arranged and stored is required to have a supply means using a spring force or the like for supplying the electrode chips to the supply port, which complicates the structure of the magazine. .. Further, since the slide unit is equipped with a removal device and a magazine in order to attach and detach the electrode tip without damaging the shank, there is a problem that the structure is complicated and the replacement device becomes large.

An object of the present invention is to solve the above-mentioned problems and to provide an electrode tip replacement device having a simple structure, a small size, can be manufactured at low cost, and the electrode tip does not fall out from a magazine supply port. Is.

In the electrode tip replacement device of the present invention made to solve the above problems, a removal device for removing the electrode tip attached to the shank and a plurality of electrode tips are aligned and stored, and the shank inserted from the supply port is an electrode. becomes the electrode tip fitted to the tip and a magazine attached to the shank, the upper surface of the removal device, the electrode tip magazine, mounted inclined one end the supply port is formed so as to be lower than the other end The magazine is characterized in that the magazine is attached so as to be inclined so that the front side plate side on which the supply port is formed is higher than the rear side plate side .

In the present invention, the magazine is formed on the upper surface of the removing device in an electrode tip exchange device in which one end having a supply port is inclined so as to be lower than the other end . Since the front side plate side is tilted so as to be higher than the rear side plate side , the electrode chips that are aligned and stored in the magazine, when the electrode chips are taken out from the supply port, the remaining electrode chips slide due to their own weight. Since the electrode chips are supplied to the drop supply port, the supply means for supplying the electrode chips to the supply port is not required, the magazine configuration is simplified, and the magazine can be manufactured at low cost. Since it is installed at an angle so as to be higher than the rear side plate side, there is an effect that the electrode tip does not fall out from the magazine supply port.

It is a front view which shows the embodiment of this invention. It is a top view of FIG. It is a figure explaining the method of removing an electrode tip. It is a figure explaining the method of attaching an electrode tip. It is a perspective view which shows the conventional example.

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 to 4.
Reference numeral 1 denotes an electrode tip 4 removing device for removing the electrode tip 4 from the tip of a shank 3 attached to a welding gun 2 attached to the tip of a robot arm of a spot welder, and a fixing claw is attached to the tip of the removing device 1. A movable claw 7 is provided at the base of the fixed claw 5 and a shaft 6 so as to be rotatable around the shaft 6, and the movable claw 7 rotates about the shaft 6, so that the movable claw 7 becomes the fixed claw 5. On the other hand, it is in the open state shown in FIG. 3 (b). Details of the mechanism by which the fixed claw 5 and the movable claw 7 of the removal device 1 are opened and closed are described in the application PCT / JP2004 / 011688 by the present applicant.

Reference numeral 8 denotes a magazine for arranging and storing a plurality of electrode chips 4. The magazine 8 is a U-shaped gutter-shaped main body 11 in which a notch portion 10 serving as a supply port for electrode chips is formed at one end of a front side plate 9. The mounting plate portion 13 is formed below the side plate portion 12 that covers the opening at one end of the main body 11, and the bottom surface of the main body 10 is placed in the intermediate portion, and the mounting plate portion 15 to be attached by the screw 14 is projected. It is composed of a one-end side plate 16 provided, a other-end side plate 17 covering the other-end opening of the main body 10, and a removable cover 18 covering the upper surface opening of the main body 10.

In order to attach the magazine 8 to the removing device 1, the screw 21 is attached to the upper end of the removing device 1 along the mounting bracket 20 fixed with the screw 19 along the mounting plate portion 13 of the one end side plate 16 of the magazine 8. At this time, the one-side plate portion 16 was formed so that one end on which the supply port 10 of the magazine 8 was formed was inclined so as to be lower than the other end, and the supply port 10 was formed. The front side plate 9 side is inclined so as to be higher than the rear side plate 22 side, and the stored electrode tip 4 is always supplied to the supply port 10 by its own weight, and there is no risk that the electrode tip 4 will come off from the supply port 10. .. In the above embodiment, the inclination angle a from one end to the lower end is 30 °, and the inclination angle b from the front side plate 9 side to the rear side plate 22 side is 10 °.

A mounting portion 25 of the electrode tip 4 is formed at the tip of the shank 3, and when the electrode tip 4 is mounted, a groove portion 26 is formed between the rear end of the electrode tip 4 and the rear end of the mounting portion 25.

Next, a method of exchanging the electrode tip exchanging device according to the embodiment will be described. As shown in FIG. 3A, one shank 3 to which the electrode tip 4 of the welding gun 2 is attached is attached to the electrode tip 4. The groove 26 at the rear end is positioned so as to correspond to the fixed claw 5 and the movable claw 7 in the state where the movable claw 7 of the removal device 1 is closed, and the movable claw 7 is moved in a direction perpendicular to the axis of the shank 3 to be shown in FIG. As shown, the groove 26 formed when the electrode tip 4 is attached is inserted into the insertion grooves 27 and 28 which are the notch grooves of the fixed claw 5 and the movable claw 7, and the shank 3 is the fixed claw 5 and the movable claw 7. When inserted into the normal positions of the insertion grooves 27 and 28, the movable claw 7 rotates to open from the fixed claw 5, the electrode tip 4 is disengaged from one shank 3, and then one shank 3 is fixed. The position returns to the position shown in FIG. 3 (a), which is separated from the insertion grooves 27 and 28 of the claw 5 and the movable claw 7. Further, after this, the welding gun 2 was rotated by 180 °, and the groove 26 of the other shank 3 corresponded to the fixed claw 5 and the movable claw 7 in the state where the movable claw 7 was closed, while the electrode tip 4 was removed from the shank 3. The electrode tip 4 is removed from the other shank 3 in the same manner as in the above.

To insert the groove 26 of the shank 3 into the insertion grooves 27 and 28 of the fixed claw 5 and the movable claw 7, either move the shank 3 side to insert or move the fixed claw 5 or the movable claw 7 forward to insert. But it's okay.

Next, the welding gun 2 is operated to make the mounting portion 25 of the electrode tip 4 of one shank 3 correspond to the supply port 10 of the magazine 8 as shown in FIG. 4 (a), and the shank 3 is moved in the axial direction. Then, as shown in FIG. 4 (b), the mounting portion 25 of the electrode tip 4 of one shank 3 is inserted from the supply port 10 of the magazine 8, and the mounting portion 25 of the electrode tip 4 of the shank 3 is inserted in the magazine 8. After fitting into the fitting hole 29 of the electrode tip 4 and attaching the electrode tip 4 to one shank 3, the welding gun 2 returns to the position shown in FIG. 4 (a). After that, the welding gun 2 is rotated by 180 °, and the attachment portion 25 of the electrode tip 4 of the other shank 3 corresponds to the supply port 10 of the magazine 8 in the same manner as when the electrode tip 4 is attached to one shank 3. The electrode tip 4 is attached to the other shank 3 to complete the replacement of the electrode tip 4.

In the present invention, the magazine 8 is supplied to the upper surface of the removal device 1 in an electrode tip replacement device in which one end of which the supply port 10 is formed is inclined so as to be lower than the other end. Since the front side plate 9 side on which the mouth 10 is formed is attached so as to be higher than the rear side plate 22 side , the electrode chips 4 are aligned and stored in the magazine 8 and the electrode chips 4 are taken out from the supply port 10. Then, since the remaining electrode chips 4 are fed to the supply port 10 by sliding down due to their own weight, the supply means for supplying the electrode chips 4 to the supply port 10 becomes unnecessary, the configuration of the magazine 8 becomes simple, and the magazine 8 is manufactured at low cost. Also, since the magazine 4 is attached so that the front side plate 9 side on which the supply port 10 is formed is inclined so as to be higher than the rear side plate 22 side, there is no possibility that the electrode chip 4 will come off from the supply port 10 of the magazine 8. ..

As described above, the present invention can provide an electrode chip replacement device having a simple structure, a small size, can be manufactured at low cost, and has no risk of the electrode chip falling out of the magazine supply port .

1 Removal device 2 Welding gun 3 Shank 4 Electrode tip 5 Fixed claw 7 Movable claw 8 Magazine 9 Front side plate 10 Supply port

Claims (1)

The removal device for removing the electrode tips attached to the shank and a plurality of electrode tips are aligned and stored, and the shank inserted from the supply port is fitted with the electrode tips to form a magazine for attaching the electrode tips to the shank. In an electrode chip exchange device in which a magazine is attached to the upper surface of the device so that one end on which a supply port is formed is inclined so as to be lower than the other end, the magazine is mounted on the front side plate side on which the supply port is formed. An electrode tip replacement device characterized in that it is mounted at an angle so as to be higher than the side plate side .

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