Double-station gantry combined processing system for automatically overturning and processing workpieces

A double-station gantry machining system allowing automatic overturning of workpieces, comprising:

• a first mobile gantry machining unit, a second mobile gantry machining unit, an overturning platform, a first workpiece fixing table, a second workpiece fixing table, a guide rail and a workbench, wherein the overturning platform is arranged on the workbench and positioned between the first gantry machining unit and the second gantry machining unit;
• the first mobile gantry machining unit comprises a first cross beam, a first workpiece grabbing structure, a first double-drive screw transmission structure and a first side rocker unit, the first side rocker unit comprising a first side rocker, and the second mobile gantry machining unit comprises a second cross beam, a second workpiece grabbing structure, a second double-drive screw transmission structure and a second side rocker unit, the second side rocker unit comprising a second side rocker;
• the first workpiece grabbing structure is arranged on a side of the first cross beam, the first double-drive screw transmission structure is arranged on another side of the first cross beam, the second workpiece grabbing structure is arranged on a side of the second cross beam, the second double-drive screw transmission structure is arranged on another side of the second cross beam, the first double-drive screw transmission structure drives the first side rocker to move upwards and downwards, and the second double-drive screw transmission structure drives the second side rocker to move upwards and downwards;
• the first workpiece grabbing structure is used for grabbing a workpiece that is on the first workpiece fixing table or that is on the overturning platform and placing the workpiece on the overturning platform or the first workpiece fixing table, respectively, the second workpiece grabbing structure is used for grabbing a workpiece that is on the second workpiece fixing table or that is on the overturning platform and placing the workpiece on the overturning platform or the second workpiece fixing table, respectively, and the overturning platform is arranged on the guide rail and is configured to overturn the workpiece.