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What are the characteristics and applications of spring finger?


Release time:

2022-03-15

As a special contact, the spring contact finger is connected between the pin and the socket. Through its structural transformation, multiple contact points are generated to form electrical interconnection. Each contact point 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 manufacturing and is widely used in medium and high voltage switches, bus connectors, high current connectors, fixed electrodes, high voltage cable end pieces, fuse connectors, and mechanical and electronic applications.

What are the characteristics and applications of spring finger?

Spring touch fingerAs a special contact, it is connected between the pin and the socket. Through its structural transformation, multiple contact points are generated to form electrical interconnection. Each contact point 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 manufacturing and is widely used in medium and high voltage switches, bus connectors, high current connectors, fixed electrodes, high voltage cable end pieces, fuse connectors, and mechanical and electronic applications.

弹簧触指

Compared with the conventional wire spring hole and twist pin and other electrical connection structures, the spring contact structure significantly increases the contact area, thereby reducing the current density at the contact position and doubling the current capacity of the electrical interconnection device. The existing contact finger structure includes quincunx contact finger, Z-shaped contact finger, wristband contact finger and spring contact finger. Wherein the plum blossom refers to the extrusion or stamping parts, assembly parts, assembly complex. Compared with the plum blossom finger, the belt finger has the advantages of no compression spring, simple structure, many contact points, strong conductivity, etc., but it has strict requirements on the material heat treatment process, high processing accuracy, and relatively high cost. Spring contact finger is a new type of contact finger structure, which allows large contact surface design tolerances and errors, constant contact stress, low wear, and long service life. Therefore, it is widely used in sliding point contact and static contact in high-voltage and ultra-high-voltage circuit breakers. Dynamic contact equipment.

Spring touch fingerStructural insertion force analysis: The insertion force is the main behavior of electrical interconnection devices, so the insertion force is an important parameter of the contact structure. If the blocking force is too large, it will be inconvenient to operate. For example, in a three-position switch, if the insertion force is too large, the energy consumption of the mechanism will be too large, which will seriously lead to the failure to open and close the brake normally. In the fixed-pole column, excessive insertion and extraction force will affect the mechanical characteristics of the circuit breaker, resulting in the arc extinguishing chamber can not be self-closed in the free state. At the same time, excessive insertion and extraction force will also cause wear of the contact surface coating, thereby limiting the electrical life of the system where the contact finger structure is located. If the insertion force is insufficient, the contact piece is easy to loosen, resulting in excessive contact resistance, resulting in excessive contact temperature rise, affecting the thermal stability of the system where the contact finger is located. Therefore, it is of great significance to improve the reliability of the electrical system by analyzing the influence of the spring contact finger structure on the insertion force, and then on the contact condition and system life.

Domestic rightSpring touch fingerThe main problem in the current research is that the ability of conducting current for a long time needs to be improved under the same shape and size. The Joule heat generated by the contact resistance of the contacts is too large to soften or even solder the contact material. Excessive temperature rise will reduce the elasticity of the contact finger, cause poor contact, and affect the reliability of the 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. In view of the above problems, scholars at home and abroad have carried out a lot of research work, including the structural design of the contact finger, the optimization of the contact material and the electroplating process.

nantong moore new material technology co., ltd. main products are watchband contact finger, spring contact finger, composite watchband contact finger, brass, copper wire, connector, spring contact, copper alloy spring and so on. Nantong Moore New Material Technology Co., Ltd. is developed from its predecessor Nantong Moore Electric Co., Ltd., which is an enterprise specializing in the design, development and research of high-strength and high-conductivity alloy materials and electrical connection products. Companies in the industry has achieved a high degree of recognition and reputation of the majority of customers. The company in line with professional advanced, pioneering spirit, set up rigorous and pragmatic, the basic concept. To do a product, cast a boutique for the purpose of the enterprise, and give full play to the characteristics of flexible and diverse enterprises, intentions to serve every customer.

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