Adjustable lower electrode device suitable for automatic projection welding

Abstract

The adjustable lower electrode device comprises an electrode cap, a locking nut and a lower electrode base, the lower end of the electrode cap is connected to the lower electrode base through threads, the locking nut is connected to the outside of the lower electrode base through threads, and the upper end of the locking nut abuts against the lower end face of the electrode cap to lock the electrode cap. A through hole is formed in the middle of the electrode cap and the middle of the lower electrode base in a penetrating mode, an electrode core is arranged in the through hole of the electrode cap, the upper end of the electrode core protrudes out of the electrode cap, and the lower end of the electrode core is fixed through an ejector pin arranged in the through hole. Position compensation can be carried out by adjusting the height of the electrode cap to eliminate a gap, the problems of weak welding and partial welding caused by the gap between a part and the electrode cap are completely eradicated, and the welding quality of the part is improved. Meanwhile, when the electrode cap is consumed, the lower motor base does not need to be integrally replaced, the service life of the lower electrode base is prolonged, and then the welding cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding, and particularly relates to an adjustable lower electrode device suitable for automatic projection welding. Background Art

[0002] With the development of the automotive industry, more and more functions can be realized by automobiles. Some functional components can install nuts on the sheet metal parts of automobiles through projection welding, thereby increasing the functions that can be realized by automobiles. Existing automatic projection welding equipment includes an upper electrode device and a lower electrode device. During the automatic projection welding process, parts are placed on the electrode cap of the lower electrode device and fixed by a positioning core and then welded. Since the positions of the positioning core and the nut conveyor for welding are fixed, the welding position cannot be adjusted. Since the electrode cap will be consumed during the welding process, the gap between the part and the electrode cap will become larger and larger during the gradual consumption process. Since the electrode cap of the existing projection welding machine is fixed and cannot adjust the position of the electrode cap to make up for the gap between the electrode cap and the part, the part and the positioning core are prone to be non-concentric during welding, resulting in eccentric nuts, and further causing problems of weak welding and offset welding. Summary of the Utility Model

[0003] Aiming at the above deficiencies, the purpose of the utility model is to provide an adjustable lower electrode device suitable for automatic projection welding, which solves the problems of weak welding and offset welding caused by the inability to adjust the gap between the electrode cap and the welded part after the electrode cap is consumed in the prior art.

[0004] To achieve the above purpose, the technical solution provided by the utility model is:

[0005] An adjustable lower electrode device suitable for automatic projection welding, which is used in cooperation with an upper electrode device. The lower electrode device includes an electrode cap, a lock nut and a lower electrode seat. The lower end of the electrode cap is connected to the lower electrode seat by a thread. The lock nut is connected to the outside of the lower electrode seat by a thread and the upper end abuts against the lower end face of the electrode cap to lock it. Through holes are formed through the middle of the electrode cap and the lower electrode seat. An electrode core is installed in the through hole of the electrode cap, and the upper end of the electrode core protrudes out of the electrode cap. The lower end of the electrode core is fixed by a thimble arranged in the through hole.

[0006] With the above structural design, the electrode cap is connected to the lower electrode seat by a thread. After the electrode cap is consumed and a gap is generated between the electrode cap and the part, the height of the electrode cap can be adjusted to compensate for the position and eliminate the gap, and then it can be locked by the lock nut below, thereby eliminating the problems of weak welding and offset welding caused by the gap between the part and the electrode cap.

[0007] As a further improvement, the lower end of the lower electrode base is of a conical structure, and an installation base is fixedly connected to the lower end. A through hole is vertically formed in the installation base for installing a thimble.

[0008] As a further improvement, the electrode cap is of a T-shaped structure, and the lower end is a threaded connection part. A threaded groove is correspondingly formed in the lower electrode base. The threaded connection part is installed in the threaded groove, and the top of the lower electrode base abuts against the lower surface of the electrode cap.

[0009] With the above structural design, it is not only convenient to adjust the position of the electrode cap, but also, since the connection is made through the threaded connection part and the threaded groove, the connection area is large, so the stability is stronger.

[0010] As a further improvement, a through hole is vertically formed in the middle of the threaded groove. A clamping platform is provided at the upper end of the through hole. A clamping part provided at the lower end of the electrode core is clamped at the lower end of the clamping platform to prevent the electrode core from moving upward.

[0011] As a further improvement, the aperture of the lower end of the through hole in the lower electrode base is larger than the aperture at the upper clamping platform.

[0012] With the above structural design, by setting the clamping platform, the position of the positioning core can be kept unchanged, ensuring the stability of welding, and at the same time, the installation is more convenient.

[0013] As a further improvement, the top of the electrode core is of a conical structure, and the end chamfer is of a spherical structure.

[0014] With the above structural design, it is convenient to place parts for welding and will not scratch the surface of the parts.

[0015] As a further improvement, the through hole in the electrode core and the electrode cap adopts a clearance fit, and the fit clearance is between 0.02 - 0.05 mm.

[0016] With the above structural design, setting the fit clearance within the above range can ensure the normal installation of the electrode core and will not cause position deviation during use.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] In the present utility model, the electrode cap is threadedly connected to the lower electrode base. Then, after the electrode cap is consumed and a gap is generated between the electrode cap and the part, the position compensation can be performed by adjusting the height of the electrode cap to eliminate the gap, and then it can be locked by the locking nut below. Thus, the problems of weak welding and offset welding caused by the gap between the part and the electrode cap are eliminated, and the welding quality of the part is improved. At the same time, when the electrode cap is consumed, it is not necessary to replace the entire lower motor base, which improves the service life of the lower electrode base and thus reduces the welding cost. Description of the Drawings

[0019] The accompanying drawings are used to provide a further understanding of the present utility model and form a part of the specification. Together with the following specific embodiments, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the accompanying drawings:

[0020] Figure 1 is a schematic structural diagram of the present utility model;

[0021] Figure 2 is an exploded view of the present utility model.

[0022] In the figures:

[0023] Electrode cap 1, threaded connection part 1a, lock nut 2, lower electrode base 3, threaded groove 3a, through hole 4, clamping platform 4a, electrode core 5, clamping part 5a, ejector pin 6, mounting seat 7. Specific embodiments

[0024] To describe in detail the technical content, structural features, achieved objectives and effects of the present utility model, the following is a detailed description in combination with the embodiments and with reference to the accompanying drawings.

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts fall within the protection scope of the present utility model. In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0026] Please refer to Figure 1 and Figure 2, An adjustable lower electrode device suitable for automatic projection welding, which is used in cooperation with the upper electrode device. The adjustable lower electrode device includes an electrode cap 1, a locking nut 2 and a lower electrode seat 3. The lower end of the electrode cap 1 is connected to the lower electrode seat 3 by thread, so that the position of the electrode cap 1 can be adjusted up and down. The locking nut 2 is connected to the outside of the lower electrode seat 3 by thread and the upper end abuts against the lower end face of the electrode cap 1 to lock it. Through holes 4 are formed through the middle of the electrode cap 1 and the lower electrode seat 3. An electrode core 5 is installed in the through hole 4 of the electrode cap 1, and the upper end of the electrode core 5 protrudes out of the electrode cap 1. The lower end of the electrode core 5 is fixed by a thimble 6 arranged in the through hole 4. The positions of the electrode core 1 of the lower electrode device and the nut conveyor are fixed, so the positions of the parts installed on the electrode core 1 are also fixed during welding.

[0027] Specifically, the lower end of the lower electrode seat 3 is a conical structure, and an installation seat 7 is fixedly connected to the lower end. The through hole 4 for installing the thimble 6 is formed through the installation seat 7 up and down.

[0028] In this embodiment, the electrode cap 1 is a T-shaped structure, and the lower end is a threaded connection part 1a. A threaded groove 3a is correspondingly formed on the lower electrode seat 3. The threaded connection part 1a is installed in the threaded groove 3a, and the top of the lower electrode seat 3 abuts against the lower surface of the electrode cap 1. The through hole 4 is formed by penetrating downward through the middle of the threaded groove 3a. A clamping platform 4a is arranged at the upper end of the through hole 4. A clamping part 5a provided at the lower end of the electrode core 5 is clamped at the lower end of the clamping platform 4a to prevent the electrode core 5 from moving upward. Among them, the aperture of the lower end of the through hole 4 in the lower electrode seat 3 is larger than the aperture at the upper clamping platform 4a, so it is more convenient to install the electrode core 5 from bottom to top. At the same time, the clamping part 5a of the electrode core 5 is clamped on the clamping platform 4a to fix the position, and the standardized installation of the electrode core 5 can also be realized. The top of the electrode core 5 is a conical structure, and the end chamfer is a spherical structure.

[0029] In this embodiment, the electrode core 5 and the through hole 4 in the electrode cap 1 adopt a clearance fit, and the fit clearance is between 0.02-0.05mm.

[0030] The working principle of the present utility model is as follows:

[0031] After the lower electrode device of the present utility model has been used for a long time, when the upper end of the electrode cap 1 gradually wears out and a gap appears between the electrode cap and the part, the electrode cap 1 can be slowly rotated upward to make it fit with the part. After the position adjustment is completed, the lock nut 2 is adjusted upward so that its upper end abuts against the lower end surface of the electrode cap 1, thereby completing the locking and fixing of the position of the electrode cap 1. Therefore, the present utility model realizes the compensation adjustment of the gap that appears after the electrode cap 1 is worn out through the adjustable method of the electrode cap 1, thereby improving the welding quality of the part, eliminating the need for overall replacement of the lower electrode device, increasing the service life of the electrode cap 1, and reducing the welding cost.

[0032] According to the disclosure and teachings of the above specification, those skilled in the art to which the present utility model pertains can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present utility model should also fall within the protection scope of the claims of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model. Other devices using the same or similar ones are all within the protection scope of the present utility model.

Claims

1. An adjustable lower electrode device suitable for automated projection welding, used in conjunction with an upper electrode device, characterized in that: The invention comprises an electrode cap (1), a locking nut (2) and a lower electrode seat (3); the lower end of the electrode cap (1) is connected to the lower electrode seat (3) by means of a thread; the locking nut (2) is connected to the outside of the lower electrode seat (3) by means of a thread and the upper end thereof abuts against the lower end surface of the electrode cap (1) to be locked thereto; a through hole (4) is provided through the middle of the electrode cap (1) and the lower electrode seat (3); an electrode core (5) is arranged in the through hole (4) of the electrode cap (1), and the upper end of the electrode core (5) protrudes out of the electrode cap (1); the lower end of the electrode core (5) is fixed by means of a pin (6) arranged in the through hole (4).

2. An adjustable lower electrode device suitable for automated projection welding as claimed in claim 1, characterized in that: The lower end of the lower electrode seat (3) is a conical structure, and is fixedly connected to a mounting seat (7). The mounting seat (7) is provided with through holes (4) extending through the upper and lower parts thereof for mounting the ejector pin (6).

3. An adjustable lower electrode device suitable for automated projection welding as claimed in claim 1, characterized in that: The electrode cap (1) is of a T-shaped structure, with a threaded connection portion (1a) at the lower end, a threaded groove (3a) correspondingly provided on the lower electrode seat (3), the threaded connection portion (1a) being installed in the threaded groove (3a), and the top of the lower electrode seat (3) abutting against the lower surface of the electrode cap (1).

4. An adjustable lower electrode device suitable for automated projection welding as claimed in claim 3, characterized in that: The middle part of the thread groove (3a) penetrates downward to form the through hole (4), the upper end of the through hole (4) is provided with a clamping platform (4a), and the clamping portion (5a) provided at the lower end of the electrode core (5) is clamped at the lower end of the clamping platform (4a) to prevent the electrode core (5) from moving upward.

5. The adjustable lower electrode device suitable for automated projection welding according to claim 1, characterized in that: The hole diameter at the lower end of the through hole (4) in the lower electrode seat (3) is larger than the hole diameter at the upper end holding platform (4a).

6. The adjustable lower electrode device suitable for automated projection welding according to claim 1, characterized in that: The top of the electrode core (5) is a conical structure, and the end chamfer is a spherical structure.

7. The adjustable lower electrode device suitable for automated projection welding according to claim 1, characterized in that: The electrode core (5) and the through hole (4) in the electrode cap (1) are clearance-matched, and the clearance is between 0.02-0.05 mm.

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