Conductive slip rings are electrical contact products and there are usually two major categories:

One is a rotating electric contact product, namely a conductive slip ring, a conductive ring, and an electric rotating joint; the other is a linear sliding electric contact. The most widely used is the pantograph of a motor locomotive. The pantograph is a comprehensive tribology. Hydraulic, pneumatic and tension control and complex mechanical electrical systems. At present, it is widely used in electric trains, trains and high-speed rail.

In the design of the conductive slip ring, many needs to be considered. The conductive slip ring is a triboelectric contact product. The initial friction is the carbon brush. Later, wear-resistant metal sheets and mercury have appeared. At present, more and more popular It is a multi-contact structure of precious metal wire, derived from the invention patent of American engineer Norries in the 1980s. Compared with traditional carbon brushes and mercury slip rings, electric slip rings have extremely important applications and obvious advantages in complex systems. Conductive slip rings are also called brushes, bus rings or collector rings. In practical applications, one A very important issue is the working life of the slip ring. The working life of the slip ring is affected by the following factors: the structure of the conductive slip ring, the life of different structures differs by tens or hundreds of times, the material of the conductive slip ring, the assembly of the slip ring The process, the working speed of the conductive slip ring, and the design and selection of the conductive slip ring must consider the environmental problems around the slip ring, the speed of the slip ring itself and the temperature rise of the bearing, the Joule effect of the slip ring electrical contact point, and The internal conductor heats up; as the increase in temperature will affect the reliability of the slip ring operation, therefore, the design and selection must also consider the influence of temperature

In practical applications, it is necessary to pay attention to several points of material selection:

1. Actual working condition of slip ring installation

2. With or without vibration or acceleration

3. Working speed and wear resistance of slip ring

4. Insulation characteristics of conductive slip ring