JPS5823499Y2 - Electrode tip for bolt welding equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an electrode tip for a bolt welding device.

Conventional electrode tips for bolt welding equipment have a kite hole for inserting the bolt shaft in the center of the top surface and a cooling water introduction hole in the center of the bottom surface, and an insulating cylindrical body is fitted into the guide hole of the electrode tip body. Because the electrode tip body is not well cooled, and with long-term use, the insulating cylinder may be subject to severe wear and tear due to the bolt shaft moving up and down inside the insulating cylinder and foreign matter such as dirt entering the insulating cylinder. If the top surface of the electrode tip body is worn out due to bolt welding, cut off the top of the electrode tip body along with the insulating cylinder to the required length, and then reuse it until the bolt shaft comes into contact with the bottom of the guide hole. Since the remaining parts must be discarded after use, there are disadvantages such as a large amount of discarded parts, making it very uneconomical.

The present invention was completed with the aim of providing an electrode tip for a bolt welding device that does not have the above-mentioned drawbacks. A guide hole 4 for inserting the bolt shaft is provided in the center of the cap 3, and an insulating cylinder 5 that is removably inserted into the guide hole 4 is inserted into the empty space 6 of the electrode chip body 2. It is characterized by having explosive support inside.

In the figure, reference numeral 7 indicates a cooling water introduction hole provided as necessary in the center of the lower surface of the electrode tip body 2, and 8 indicates an empty space 6 of the electrode tip body 2 as a means for resiliently supporting the insulating cylinder 5.
This spring is interposed between the locking step 9 provided at the bottom of the insulating cylinder 5 and the outward flange 10 provided at the bottom of the insulating cylinder 5.

In this case, the bolt shaft A is inserted into the insulating cylinder 5 which is fitted into the guide hole 4 provided in the center of the cap 3 for inserting the bolt shaft, and the bolt head opening is covered. If the cap 3 is placed on the upper surface of the welding member while welding is performed in the same manner as before, the bolt head opening can be accurately welded to the welded member under the insulation of the insulating cylinder 5. However, since the insulating cylinder 5, which is removably inserted into the guide hole 4 of the cap 3, is elastically supported within the cavity 6 of the electrode tip body 2, the bolt shaft 5 is inserted into the insulating cylinder when inserted. 5, when the upper electrode is lowered and the bolt head opening is pressed, the bolt shaft part A is forced to fall into the insulating cylinder 5 because the insulating cylinder 5 easily descends under elastic support. It will be inserted and positioned without any problem.

Moreover, since the compressed air supply port 1 is provided in the lower part of the electrode tip body 2, compressed air at the required pressure is supplied from the compressed air supply port 1 to the insulating cylindrical body 5 of the cap 3 and the bolts during welding work. By supplying the cap 3 and the electrode nap body 2 between the shaft part A and the shaft part A, not only can the cap 3 and the electrode nap body 2 be cooled, but also foreign matter such as dust that has entered the insulating cylinder body 5 can be blown away. The wear and tear on the upper surface of the cap 3 due to welding is significantly reduced compared to the conventional case.

Furthermore, since the insulating cylinder 5 is removably inserted into the guide hole 4 of the cap 3, if the top surface of the electrode tip main body 2 is worn out due to long-term use, the insulating cylinder 5 can be replaced. The cutting work is easy as you only need to remove the cap 3 and cut it to the required length, and if you attach it to the cutting diameter electrode tip body 2 and reuse it, the length of the insulating cylindrical body 5 will not change and the length of the insulating cylindrical body 5 will not change. In the same way, the bolt shaft part A can be inserted and positioned accurately, and if the cap 3 is reused several times in this way and the cap 3 becomes unusable, the cap 3 can be attached to the upper end of the electrode tip body 2. Since it is removably attached to the opening, the electrode tip main body 2 can be used almost semi-permanently by replacing only the cap 3, which is extremely economical.

Note that as a means for elastically supporting the insulating cylinder 5 in the cavity 6 of the electrode tip body 2, the lower end opening of the insulating cylinder 5 is closed instead of using a spring as in the above embodiment. Of course, the insulating cylindrical body 5 may be elastically supported by the air pressure supplied from the insulating cylinder 5.

Therefore, the present invention has great practical value as it eliminates the drawbacks of the conventional electrode tips for bolt welding equipment.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional front view showing an embodiment of the present invention. 1... Compressed air supply port, 2... Electrode chip body, 3... Cap, 4... Guide hole for inserting bolt shaft, 5... ...Insulating cylindrical body,
6...vacant room.

Claims (1)

[Scope of utility model registration request] A cap 3 is removably attached to the upper end opening of the electrode chip body 2 having the compressed air supply port 1, and a guide hole 4 for inserting the bolt shaft is provided in the center of the cap 3, and the cap 3 can be inserted into and removed from the guide hole 4. An electrode tip for a bolt welding device, characterized in that an insulating cylindrical body 5 to be fitted is resiliently supported within a cavity 6 of an electrode tip body 2.