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Research on Spring Touch Finger


Release time:

2022-04-26

The spring contact finger structure is connected between the pin and the jack as a special contact. Multiple contacts are generated through the structural transition to form an electrical interconnection. Each contact acts as a bridge to make the current flow evenly. Due to its simple structure, small size and low cost, it is suitable for mass production and is widely used in medium and high voltage switches, bus connectors, high current connectors, sealed electrodes, high voltage cable end pieces, fuse connectors and electromechanical applications.

Research on Spring Touch Finger

The spring contact finger structure is connected between the pin and the jack as a special contact. Multiple contacts are generated through the structural transition to form an electrical interconnection. Each contact acts as a bridge to make the current flow evenly. Due to its simple structure, small size and low cost, it is suitable for mass production and is widely used in medium and high voltage switches, bus connectors, high current connectors, sealed electrodes, high voltage cable end pieces, fuse connectors and electromechanical applications.

弹簧触指

Compared with the conventional wire reed hole, twisted pin and other electrical connection structures, the contact area of the contact finger structure is significantly increased, thereby reducing the current density at the contact location and doubling the current flow capacity of the electrical interconnection device. Existing contact finger structures include tulip contact fingers, Z-shaped contact fingers, ribbon contact fingers, and spring contact fingers. The plum blossom contact finger of the present invention is an extruded or stamping part, with many assembled parts and complicated assembly. It has the advantages of no compression spring, simple structure, many contact points, strong conductivity, etc., but it has higher requirements for material heat treatment process and processing accuracy. Higher, higher cost; spring finger is a new type of finger contact structure, because the spring finger contact allows larger tolerances and errors in the contact surface design, moreover, the contact stress is constant, the wear is small, and the service cycle is long, so the sliding point contact and dynamic and static contact equipment in high-voltage and ultra-high-voltage circuit breakers have been widely used.

The research on spring contact finger in China started late, but the main problem is that under the condition of the same size, its conductive ability needs to be improved for a long time. The contact resistance of the finger generates excessive Joule heat, which softens or even melts the contact material. The temperature rise is too high will reduce the contact elasticity, resulting in poor contact contact, affecting the reliability of electrical contact. At the same time, the high temperature reduces the insulation performance of the material, and even electrical breakdown or short circuit may occur. Scholars at home and abroad have done a lot of research work on finger structure design, finger material optimization and electroplating process. By increasing the contact force and contact area, increasing the insertion and extraction force, the material wear is accelerated, the contact material is plastically deformed or even damaged, and the number of insertion and extraction is reduced. Therefore, it is necessary to optimize the structure of the spring finger to ensure that the spring finger has a larger contact area, thereby reducing the contact resistance.


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