EARTH BLOCK

With the development of rail vehicle technology in China, more and more vehicles in rail transit currently use aluminum alloy bodies, and also put forward new requirements for the grounding scheme of vehicle electrical equipment. If aluminum alloy materials are used as the ground point of the car body, aluminum An oxide layer is easily formed on the surface of the alloy, which affects the conductive performance, and the ground terminal is mostly a copper terminal. It is easy to produce electrochemical corrosion when directly connected to the aluminum alloy car body. Fixed issue. Under this background, the copper-clad aluminum composite grounding block is widely used in aluminum alloy vehicles. The outer layer of the grounding block is copper (outer coating). Copper has good chemical stability in the atmosphere and is not easily oxidized. The material of the ground wire terminal is the same. The ground block has an aluminum layer in the middle. The aluminum layer and the aluminum alloy body can be directly welded.