The power grid system is used for the quick and convenient operation of welding machines, electric tools and pneumatic tools in the welding workshop, and provides the welding machine placement, power supply, air source, lighting and other requirements for the workers in the work process, improves the work efficiency of the workers, and improves the quality of the products. ,Yield. Socket boxes and mixed gas joints are often arranged on the power grid column of the passenger car welding line to meet the needs of welding work; the power grid column of the passenger car assembly line is mostly equipped with spring structure pneumatic connectors and electric connectors to meet the passenger car assembly line The demand for plugging in pneumatic tools and electric tools