Automatic head-changing head magazine mechanism for gantry machining center

The utility model relates to the technical field of gantry machining centers, in particular to an automatic head-changing head magazine mechanism for a gantry machining center, which comprises a head magazine body, a plurality of head magazine supports and a pushing mechanism. The head magazine body is independent from a machine tool, the head magazine supports capable of longitudinally moving are arranged on the left of the upper end face of the head magazine body, the pushing mechanism pushes the head magazine supports to move, a trolley capable of transversely moving and a driving device are arranged on one side of each head magazine support on the head magazine body, and the driving device drives the trolley to move. The automatic head-changing head magazine mechanism is capable of automatically replacing accessory head supports as needed, fast in automatic head changing speed, high in positioning precision and capable of ensuring reliable performance of the machine tool. After a head of the machining center is automatically changed once, a workpiece can be machined into a pentahedron by being clamped once, and the machining efficiency of the whole machine tool and machining precision of the workpiece can be improved, so that the gantry-type numerical control machine tool with the structure can successfully enter national key industries.