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The principle of spring contact finger


Release time:

2022-04-06

The principle of spring contact finger, spring contact finger as an elastic contact, it is installed on the electrical contact between two rigid input and output. By compressing a certain proportion, an elastic force is generated, thereby ensuring reliable contact.

The principle of spring contact finger

The principle of spring contact finger, spring contact finger as an elastic contact, it is installed on the electrical contact between two rigid input and output. By compressing a certain proportion, an elastic force is generated, thereby ensuring reliable contact.

弹簧触指

The principle of spring touch finger is as follows:

The more contact points, each spring coil is a contact point, which is equal to many parallel rings. The more contact points, the more turns, the smaller the contact resistance, the more shunts, and the smaller the current flowing through each turn. The number of turns is large, the current distribution is uniform, and the heat dissipation is good.

The relatively large range of constant contact force values and the large range of constant contact force values can ensure that the contact resistance remains basically unchanged under the vibration environment.

Based on the original spring touch finger, there can be different shapes of touch finger, single surface contact, double surface contact, round surface contact, etc.

The contact resistance of a single coil spring contact finger is 4-5 micro euros. Taking 50 turns of contact as an example, the resistance is 0.1 micro euros, the resistance is very small, and the heat loss is very small.

Beryllium bronze is hard and powerful. The strength of zirconium and copper is more suitable. The contact friction is less than half of the friction of the tulip contact, especially the high-current contactor, 3150/4000a contacts 82 contacts, the pressure is large, the circuit breaker shaking and shaking torque is large, it is difficult, but the spring contact does not Need a lot of operating force.

Silver plating process is often used in plum contacts, but due to the high contact pressure, frequent contact between the inside and outside of the contact, the wear and peeling of the silver plating layer will lead to rapid corrosion of the copper anode, resulting in the loss of its excellent conductivity and threatening the safety of power grid operation. The silver-graphite composite coating is prepared by using the corrosion behavior of the contact substrate copper under the action of current to improve the corrosion resistance and wear resistance of the contact material. Because its coating has high hardness, excellent wear resistance and corrosion resistance, but the cost is too high.

The use of a spring contact finger due to the low working pressure, contact knowledge points, so the contact wear is small, shake in and out 10000 times. Moreover, each outer diameter is small, the current carrying capacity is large, the anti-short-circuit calculation ability is strong, and the electric field distribution of the contact system is uniform.

Many people will worry about the application of spring contact fingers in pulling out the circuit breaker. In fact, by improving the accuracy and positioning the positioning pin in advance, the requirement of spring contact fingers/-1mm can be fully guaranteed.

The spring fingers need not be round. Other shapes may be used for different applications, such as rectangular contacts for frame breakers, single-sided contacts for low voltage drawers, etc.


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