Projection welding upper electrode structure capable of sequentially welding multiple nuts in time sharing manner

Abstract

The invention discloses a projection welding upper electrode structure capable of sequentially welding multiple nuts in a time sharing manner. The projection welding upper electrode structure comprises a bottom plate and at least three electrode assemblies arranged on the bottom plate. The bottom plate is connected with adjustable installing plates. The two perpendicular side faces of the adjustable installing plates are connected with positioning blocks. Each electrode assembly comprises the corresponding adjustable installing plate, an air cylinder installing plate, a welding air cylinder, an air cylinder electrode transition plate, an electrode connecting base, an electrode body, a water nozzle and an electrode head. A conductive belt adapter plate is connected to the rear side face ofthe bottom plate and connected with conductive belts, and conductive belt connection copper plates are connected with the electrode connecting bases of the electrode assemblies. Providing the projection welding upper electrode structure capable of sequentially welding the multiple nuts in the time sharing manner is the purpose, a plurality of electrodes can be used for sequentially welding a workpiece according to the set sequence after one-time workpiece installation, the requirements for the welding air cylinder diameter and the transformer volume are lowered, and the equipment manufacturingand using cost is reduced.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a projection welding upper electrode structure capable of time-sharing and sequentially welding a plurality of nuts. Background technique [0002] Nut projection welding is one of the more commonly used resistance welding methods. It is mainly used to weld nuts with bumps or convex rings to sheet metal parts. It is widely used in parts such as automobile bodies and home appliance casings. [0003] In the existing floating multi-point simultaneous projection welding electrode structure, during welding, all projection welding upper electrodes move downward at the same time to press the nut to be welded, and multiple electrodes are energized at the same time to weld the nut. The multi-point welding projection welding upper electrode structure of the above structure can simultaneously weld a plurality of nuts on a workpiece, and the production cycle is fast and the efficiency is hig...

AI Technical Summary

Problems solved by technology

However, there are also the following problems: multiple electrodes press the nut at the same time. If the height of the upper surface of the nut is inconsistent or there is a difference in height between the upper and lower electrodes, it is impossible to ensure that the pressure exerted on each nut is consistent, which will cause one or more nuts to fail to be pressed. Welding defects such as virtual welding and sparking occur; multiple electrodes are pressurized and energized at the same time, and only multiple nuts of the same specification can be welded, and the pressure and welding current distributed to each nut cannot be guaranteed to be completely consistent; in addition, for To ensure that each nut welded at the same time has sufficient pressing force and welding current, the diameter of the cylinder and the capacity of the welding transformer need to be doubled, and the volume of the projection welding machine will increase accordingly, which greatly increases the manufacturing and use costs of the projection welding machine

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