Center frame of square tube laser cutting machine

The invention discloses a center frame of a square tube laser cutting machine. The center frame used for supporting and clamping square tube workpieces and synchronously rotating with a spindle motor mainly comprises a synchronous clamping supporting mechanism, a synchronous rotating control mechanism, a hollow center frame structure, and a tube axial movement mechanism. The four mechanisms operate in coordination to clamp and support square tubes, under high precision, high accuracy and high stability, and axially feed the square tubes for laser machining. The workpieces can be clamped and supported accurately in sync through the synchronous clamping supporting mechanism; a rotating motor can drive a claw and a clamped workpiece to rotate in sync through the synchronous rotating control mechanism. The hollow center frame structure can coordinate with the tube axial movement mechanism to axially move the square tubes for machining. The center frame allows the square tube workpieces to be clamped and supported accurately, can rotate in sync with the spindle motor, and allows for axial movement for machining; accordingly, machining range is widened, and machining efficiency and machining precision are improved.