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Spring touch finger you understand


Release time:

2022-05-05

Spring contact finger: In life, it is used in the fields of automobiles, electronic equipment, electrical connectors, etc. The first and end of this spring are welded to form a spring ring. We don't know much about the structure of this part and will question "what is this". Following the small series, take a more detailed look at the "spring touch finger".

Spring touch finger you understand

Spring contact finger: In life, it is used in the fields of automobiles, electronic equipment, electrical connectors, etc. The first and end of this spring are welded to form a spring ring. We don't know much about the structure of this part and will question "what is this". Following the small series, take a more detailed look at the "spring touch finger".

弹簧触指

The spring contact finger is also called the oblique coil spring and the ring spring. The coil is an elliptical inclination. Each coil is deformed individually when compressed. No matter which part of the coil is deformed, the entire spring will react. The load at each contact point is all The same, so the almost constant elastic force can be maintained overall.

Due to the structural characteristics, there is no limit to the scope of use. It is suitable for use in various static or dynamic medium voltage environments. It can be used purely to transmit mechanical connections or strong currents. It is widely used in automobiles, electronic equipment, high-current connectors, and pressure switches in universities. field.

Spring touch fingers are very popular because of their strong performance. The production is simple in structure, small in size, small in material, and low in cost. It can meet the small size requirements of the parts designer's space and is suitable for small designs, so the design of precision parts can be simplified with the least parts. Ring design, spring contact finger multi-point contact guarantee, high concentration almost non-destructive contact, large current carrying capacity and stable conductivity guarantee, consistent load at each contact point, improve the wear resistance of the spring. Finally, as far as production is concerned, the unique structure makes it have a wide working range, allows a larger tolerance on the connection surface, has greater adaptability to processing errors and assembly errors, and is more suitable for mass production.

In order to make the spring touch finger fully play a role in the component, not only must be carefully selected from the material, but also the design must be exquisite. The inclination angle of the spring will affect the stress of the spring. The larger the angle, the greater the deformation resistance, and the smaller the angle, the more effectively the deformation force is reduced. For dynamic connection, if it is desired that the spring contact finger is in complete contact with the conductor and the guide sleeve, the smaller the stress of the spring contact finger, the better. For a static connection, the stress can be increased accordingly to further reduce the contact resistance.

spring finger theory

Electrical connection refers to the electrical transmission connection between conductors by mechanical force. However, the contact surface (surface contact area) where such a mechanical force is generated is not equal to the useful contact surface for the load current. The pollution layer on the metal surface includes gray, oil film and metal compounds. The useful contact area is much smaller than the surface contact area. The current channel is gathered at a single contact point, and the contact resistance is increased. That is, the connection between faces actually seems to be a connection between points.

Spring touch technology has been on the market since the early 1960 s and has been successfully used for more than half a century. It is an excellent choice for working safely in environments with strict requirements on temperature, vibration and shock. It is very suitable for high-current, high-load high-voltage switches; the number of plugs is high, which fully meets the life test requirements of the switch. Compared with the spring contact finger, the spring contact finger has three main advantages: small slot size, low contact resistance, high stability. Development Trend of Spring Touch Finger Technology

Miniaturization is the trend of GIS development in the future, and the spring contact technology is also used to this change and is developing towards miniaturization.

Spring contact finger is a kind of electric fusion, which is widely used in combination appliances, circuit breakers, transformers, switch cabinets, gas insulated bus and other electrical products. The spring strap refers to the extremely small heating power, extremely small contact resistance, safe and uniform contact force, which ensures good electrical fusion and brings more long-term effects to the power system.

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