The single-arm spring hose reel is a mechanical device that uses a high-life spiral spring to drive the reel to automatically wind the hose. It is often used to transport fluid, such as water below 30MPa, argon (air) below 2.5MPa, hydraulic oil below 35MPa. Ratchet and pawl self-locking mechanisms can be provided according to user needs, which can be used in combination with conductive slip rings to transport liquid (gas) and dielectric at the same time.