Link lever assembly, dual-link-lever fixing assembly and surgical head frame

A link-lever assembly, comprises a dual-joint link-lever (110) and a guiding rod (120), wherein the guiding rod (120) comprises a ring portion (121) and a rod portion (122);

• the dual-joint link-lever (110) comprises a first connection ring (111), a first pressing panel (112), a second connection ring (113), a second pressing panel (114) and a connection plate (115);
• the first connection ring (111) and the second connection ring (113) are provided at both ends of a longitudinal direction of the connection plate (115), and axially the first connection ring (111) and the second connection ring (113) are parallel;
• the first pressing panel (112) is provided at a side of a thickness direction of the connection plate (115) and end portions of the first pressing panel (112) are connected with the first connection ring (111), a first locking joint (c) communicating with a first annular hole (a) of the first connection ring (111) is formed in between the first pressing panel (112) and the connection plate (115);
• the second pressing panel (114) is provided at another side of the thickness direction of the connection plate (115), and an end portion of the second pressing panel (114) away from the first pressing panel (112) is connected with the second connection ring (113), and a second locking joint (d) communicating with a second annular hole (b) of the second connection ring (113) is provided in between the second pressing panel (112) and the connection plate (115);
• the first pressing panel (112) and the second pressing panel (114) are configured to drive diameters of the first annular hole (a) and the second annular hole (b) to be smaller after extruding by extruding forces in opposite directions;
• at least one connection hole (g) is provided on the ring portion (121), a third locking joint (h) extending along an axial direction of the rod portion (122) is provided on the rod portion (122), and the third locking joint (h) is communicated with the at least one connection hole (g);
• the rod portion (122) is inserted into the second connection ring (113);
• the rod portion (122) is configured to make the third locking joint (h) to be smaller when being extruded and drive a diameter of the at least one connection hole (g) of the ring portion (121) to be smaller.