Liquid metal electric slip ring for robot joint

By employing a ring-shaped cavity structure with liquid metal slip rings and a ball-bearing sealing ring design in the robot joint, the problem of wire entanglement was solved, enabling infinite rotation and stable electrical signal transmission, thus improving the flexibility and service life of the robot joint.

CN121394993APending Publication Date: 2026-01-23SUZHOU SYNTEC EQUIP CO LTD
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Patent Information

Application Number
CN202511832741.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-08
Publication Date
2026-01-23

AI Technical Summary

Technical Problem

The problem of wire entanglement in existing robot joints limits the rotation angle and prevents infinite rotation. Furthermore, traditional non-contact transmission technologies suffer from low power density, high cost, and susceptibility to electromagnetic interference, lacking a stable and efficient conductive solution.

Method used

Using liquid metal as the transmission medium, an annular liquid metal cavity is formed through the stator and rotor assemblies. Electrical signals are transmitted using stator and rotor electrodes, avoiding wire connections. The combination of sealing rings and ball bearing structures ensures sealing and low friction, enabling infinite rotation.

Benefits of technology

It enables infinite rotation of robot joints, reduces mechanical wear and maintenance costs, ensures stable transmission of electrical signals and long lifespan, and is suitable for long-term operation in harsh environments.

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Abstract

The invention discloses a liquid metal electric slip ring for a robot joint. The liquid metal electric slip ring comprises a stator assembly; the rotor assembly can rotate relative to the stator assembly; the rotor assembly is matched with the stator assembly to form at least one annular liquid metal cavity channel; the at least one stator electrode is positioned on the surface of the stator assembly and is positioned in the annular liquid metal cavity channel; the at least one rotor electrode is located on the surface of the rotor assembly and located in the annular liquid metal cavity channel; and the assembling component is respectively matched with the stator component and the rotor component so as to combine the stator component and the rotor component together. Therefore, an annular liquid metal cavity channel for liquid metal to circulate is formed, and electric signal transmission is achieved through the electrodes.
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