Exchangeable workbench structure for large-sized gantry machine

The invention discloses a workbench structure, and in particular relates to an exchangeable workbench structure for a large-sized gantry machine, which comprises a frame (12), wherein a workbench (1) is in slip connection with the upper part of the frame (12). The workbench structure is characterized in that a motor (2) and a speed reducer (3) connected with the motor (2) are fixed on the frame (12); an output shaft (6) of the speed reducer (3) is provided with a drive sprocket (7); the frame (12) is in rotary connection with a driven sprocket; a chain (4) is assembled between the drive sprocket (7) and the driven sprocket; the chain (4) is connected with a link span (5); a linear guide rail (9) is arranged between the link span (5) and the frame (12); a movable part above the linear guide rail (9) is connected with a toggle plate (8); and the toggle plate (8) is matched with a toggle groove on the workbench (1). Compared with the prior art, the workbench structure has the advantages of simplified whole structure, small occupied space, convenient installation and maintenance and flexible and reliable action.