A static contact structure and its fixed forming process with arc striking angle

Abstract

The invention relates to a static contact structure and a fixed formation process for the same and an arc striking angle. By directly growing a stretching boss during the formation process of a connection plate, the step of arranging a fastening piece such as a bolt and a rivet during the fixed connection process is directly omitted, annealing of a welding process on the arc striking angle and a copper piece is prevented, the fixed installation speed of the arc striking angle and the connection plate is greatly improved by reducing the time of the step of fastening piece alignment and installation, an installation part and the installation step are reduced particularly when automatic equipment is used for fixing the arc striking angle, the structure of the automatic equipment can be correspondingly simplified, and the cost of researching and manufacturing the automatic equipment is reduced. Moreover, the part selection process is prevented, and the factory benefit is improved; and meanwhile, the arc striking angle is changed to be riveted after zinc plating, a traditional process of copper plating first and then silver plating is not depended, the electroplating cost is greatly reduced, and arc slag sputtering caused by relatively large resistance difference between an iron material (the arc striking angle) and a copper material (a contact) during welding operation is reduced.

Description

technical field [0001] The invention relates to the technical field of electrical switches, in particular to a structure of a static contact on a molded case circuit breaker and a process for fixing it to an arc striking angle. Background technique [0002] An important performance index of the circuit breaker is the arc extinguishing ability. At present, the circuit breaker usually uses the arc starting angle to introduce the arc into the arc extinguishing chamber for arc extinguishing treatment. In the prior art, the arc starting angle is usually welded with the connecting plate by welding. The connecting plate is welded with the wiring plate again. [0003] The role of arc strike angle is very important. In a nutshell, the function of the arc strike angle is to quickly introduce the arc generated by the moving and static contacts into the arc extinguishing chamber when breaking the short-circuit current, and produce a current limiting effect in the process to protect the...

AI Technical Summary

Problems solved by technology

[0005] The resulting problems are: 1. When the arc ignition angle is welded with the connecting plate, the arc ignition angle coating is lost, and the arc ignition effect is reduced

[0006] Because one of iron and copper has high resistance and the other has low resistance, there is a large difference in resistance. When welding the arc starting angle and the connecting plate, it is easy to cause arc slag sputtering and hurt the operator's body.

At the same time, the weldability of the welding part is not good, and there is a situation of virtual welding, which causes the arc angle to fall off during use.

[0007] When the arc ignition angle is pickled before the silver plating process, the copper layer becomes thinner after pickling, resulting in the failure of the silver layer to be plated, the thinner silver layer, and the surface layering, etc., resulting in the failure of the salt spray test and the poor arc ignition effect. good

[0008] Copper-plated and then silver-plated at the starting arc leads to increased cost

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