Large gate fixed wheel shaft hole overall machining device and machining method

According to the overall machining device and method for the fixed wheel shaft hole of the large gate, all assembled and welded single gate leaves are integrally pre-assembled together in a horizontal state, overall machining of a water seal seat face and overall machining of the fixed wheel shaft hole are completed in the state, and machining is convenient and flexible and is not limited by an operation site; in the fixed wheel shaft hole machining process, the reference surface selection is consistent and remains unchanged, machining size remeasurement can be conducted at any time, and size control is facilitated. Accumulative errors caused by multiple times of clamping and alignment, use of a plurality of datum planes and the like are eliminated, secondary overall assembly inspection of the gate needed in a conventional machining method is reduced, and the production cost is reduced; a plurality of sets of cutting devices can be arranged on the lathe bed as required, so that multi-working-surface and multi