A large-stroke air flotation type nano-positioning platform, comprising a base platform (1), wherein, a liner motor (2) is provided on the base platform (1) and connected with an air flotation platform (3), and a bearing platform (4) is provided below the air flotation platform (3);
- a plurality of shock absorption assemblies (5) are embedded in the base platform (1) and arranged at intervals below the bearing platform (4);
- each of the plurality of shock absorption assemblies (5) comprises a bottom plate (50), shock absorption columns (51) are symmetrically provided on an upper end of the bottom plate (50), a piston (52) is cooperatively arranged in the shock absorption column (51), a cavity is formed between a bottom end of the piston (52) and an inner wall of the shock absorption column (51), a sliding rod (53) is fixed on an upper end of the piston (52), an assembly joint (54) is connected to a top end of the sliding rod (53), a top plate (55) is provided on the assembly joint (54) and connected to a bottom end of the bearing platform (4), and a shock absorption spring (56) is provided between the assembly joint (54) and the shock absorption column (51), and the shock absorption spring (56) is sleeved on the sliding rod (53);
- the assembly joint (54) comprises an assembly frame (540), the assembly frame (540) is fixed on the top end of the sliding rod (53) and has an upward tapered curved surface, groove bodies (541) are circularly provided on the tapered curved surface, a roller (542) is rotatably arranged in the groove body (541), an assembly cover (543) is cooperatively arranged above the assembly frame (540), a top portion of the assembly cover (543) is fixed to the bottom end of the bearing platform (4), an inner wall of the assembly cover (543) is matched with the tapered curved surface, and the assembly cover (543) is capable of contacting with the roller (542);
- installation holes (40) are provided at intervals on an upper end of the bearing platform (4), an auxiliary air flotation element (6) is provided in each of the installation holes (40), the auxiliary air flotation element (6) comprises a porous plate (60), a column body (61) and a baffle plate (62) connected in sequence from top to bottom, the porous plate (60) and the baffle plate (62) are cooperatively arranged with the installation hole (40), respectively, the installation holes (40) are communicated with an air inlet pipeline (41) arranged below the installation holes, the air inlet pipeline (41) is provided in the bearing platform (4) and communicated to the outside, the air inlet pipeline (41) is connected with a first air pump, a baffle ring (63) is provided in each of the installation holes (40), the column body (61) is coupled with the baffle ring (63), an auxiliary air passage (64) is communicated between walls of the installation hole (40) located above and below the baffle ring (63), and an air outlet channel is provided in the column body (61) and communicated with a top portion and a side wall of the column body (61);
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- a port of the auxiliary air passage (64) located below the baffle ring (63) is located on a side of the baffle plate (62), and a port of the auxiliary air passage (64) located above the baffle ring (63) is located below the porous plate (60).