Through bore electrical slip ring is widely used in cable reel, to help the cable reel to store and retract the cable within a short distance, can store and retract power, control signals, network cables, optical fibers, audio and video cables, etc..  Through bore electrical slip ring can make the single support guide frame change the direction as needed, and can be used when laid horizontal or lifted.  With the development of new energy cars in recent years, it has been widely used in new energy cars charging  cable reel.