How to choose conductive slip ring

Many factors need to be considered in the design and manufacture of conductive slip rings. As we know, conductive slip rings belong to electrical contact applications, and there are usually two types. One is rotary electric contact, that is, conductive slip ring and electric rotary joint, and the other is linear sliding electric contact. The most widely used is the pantograph of electric locomotive, which is widely used in motor cars and high-speed trains at present. Electric pantograph is a complex electromechanical system integrating tribology, hydraulic pressure, air pressure and tension control. Conductive slip ring is a kind of friction electric contact, driven by carbon brush. Later, metal sheets and mercury appeared. At present, the multi-contact structure of precious metal wire is becoming more and more popular, which originated from the invention patent of American engineer Norris 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, slip rings or slip rings. In practical application, a very important problem is the working life of slip rings. There are several factors that affect the working life of the slip ring: the structure of the conductive slip ring, the life difference of different structures is dozens or hundreds of times, the material of the conductive slip ring, the assembly technology of the slip ring, the working speed of the conductive slip ring and the design of the conductive slip ring. The rotating speed of the slip ring itself and the temperature rise of the bearing; Joule heat of slip ring electrical contact: Because the increase of temperature will affect the reliability of slip ring, the influence of temperature must be considered in design and selection. Material selection points of conductive slip ring, also known as slip ring, confluence ring or central rotating joint. In practical application, several key points should be paid attention to in material selection: 1. The actual working conditions of slip ring installation; 2. Whether there is an estimated value of vibration or acceleration; 3. Working speed and wear resistance of slip ring; 4. Insulation characteristics of conductive slip rings. When selecting the type of conductive slip ring, the following points should be paid attention to. Otherwise, it may lead to improper selection and affect customers' use: the working conditions of the field slip ring: speed, temperature, environmental water vapor content, field cable direction, field power and signal current and voltage, how to improve the reliability of the precious metal wire conductive slip ring; To improve the reliability of precious metal wire conductive slip ring, we must start from the following aspects: Compared with mercury slip ring, precious metal wire conductive slip ring has the following characteristics: 1. Mercury slip ring contains toxic metal mercury, which is not environmentally friendly and has poor maintainability. 2. Compared with precious metal wire slip rings, the electromagnetic interference of mercury slip rings is difficult to solve. 3. When there are many rings, such as dozens of rings, the mercury slip ring cannot be untied. Generally speaking, mercury slip rings have some advantages when the number of turns is small and the current is large. 1. The structure design of the conductive slip ring must be reasonable, and it must be shaped according to the field application. 2. The material selection of the conductive slip ring should be appropriate. 3. The production process of slip ring must be perfect. 4. The installation and use of slip rings must be reasonable. 5. Regular maintenance of sliding at present, some slip ring manufacturers only provide customers with a product with similar appearance, ignoring important links such as slip ring selection, design, manufacture, installation and maintenance, resulting in poor user experience. Some imported products have similar problems. Therefore, it is necessary to provide users with a complete solution, rather than selling only one product. Precious metal multi-contact conductive slip ring originated from American patent. Compared with carbon brushes, precious metal slip rings have the following characteristics: 1. Reliable contact. Precious metal multi-brush wire (via series) is a typical multi-contact contact. Compared with carbon brushes, the contact point is a geometric multiple. 2. Good wear resistance. 3. In practice, less wear debris can easily lead to short circuit between conductive rings. In typical power plant production, an important daily maintenance is that toner must be cleaned regularly, otherwise the slip ring will short circuit and catch fire. The selection of conductive slip ring shell material has the following principles: 1. Must meet the needs of the field working environment, such as dust prevention inside the rack and indoors, and most engineering plastics can meet the requirements. If the size is too large, use aluminum alloy, copper, carbon steel or stainless steel. 2. Working speed and material strength must be considered. If the working speed is high, it will produce great vibration and centrifugal force, and the shell must be made of materials with sufficient strength. 3 manufacturability must be considered.