PARALLEL MECHANISM WITH THREE-DIMENSIONAL TRANSLATION AND ONE-DIMENSIONAL ROTATION

摘要

A parallel mechanism with three-dimensional translation and one-dimensional rotation comprises a fixed mount (1), a moving platform (7) and four branch chains symmetrically arranged between the fixed mount (1) and the moving platform (7) and having the same structure. The moving platform (7) comprises a primary platform (8) and a secondary platform (9) horizontally arranged and having the same centre line. The primary platform (8) is of a closed structure. The secondary platform (9) is embedded into the primary platform (8). The primary platform (8) and the secondary platform (9) are connected through a rotary mechanism. The rotary mechanism comprises a nut (11) fixedly connected with the secondary platform (9) and a screw (10) rotatably connected with the primary platform (8) through a bearing. The nut (11) and the screw (10) form a screw pair. The centre line of the screw (10) is coincident with the vertical axis of the moving platform (7). The primary platform (8) is fixedly connected with a guide rod (13). The secondary platform (9) is slideably connected with the guide rod (13). The present invention has a compact structure and high rigidity and stability, and has a guide mechanism and the rotary mechanism designed light, so that the moving mass is reduced, high-speed capture is easily realized and the requirements of complicated capture and release operations are met.