Grinding device for cuboid plate machining

The invention discloses a grinding device for cuboid plate machining. The grinding device comprises a workbench, a fixed plate, a fixed table and a grinding head. The fixed plate is fixed to the middle of the top end of the workbench. A motor is fixed to the bottom end of the middle in the fixed plate. An output shaft of the motor is connected with a first rotating shaft. A boss is fixed to the middle of the fixed plate. The first rotating shaft penetrates through the boss and extends to the upper portion of the boss. A first gear is fixed to the top end of the first rotating shaft. A groove is formed in the edge, located on the boss and the fixed plate, of the top end of the fixed plate. Triangular plates are arranged at the corners of the groove. An arc face is arranged on the side, close to the boss, of each triangular plate, a clamp opening is formed in one side of each triangular plate, and a movable baffle matched with the corresponding clamp opening is movably connected in eachclamp opening and is an o