Unfolding mechanism based on shape memory alloy driving

The invention provides an unfolding mechanism based on shape memory alloy driving. The unfolding mechanism comprises a main rod, an auxiliary rod, a driver, hinges and limiting blocks; the driver comprises a shape memory alloy spring; the main rod is rotationally connected with the auxiliary rod; the driver is mounted on the auxiliary rod; the hinges are arranged on the main rod and the auxiliaryrod, one end of each hinge is connected with the shape memory alloy spring of the driver, and the other end of each hinge is fixed on the main rod; a limiting block is arranged on each of the main rodand the auxiliary rod; and the shape memory alloy spring of the driver is heated, the shape memory alloy spring is subjected to phase change to generate restoring force, the hinges are driven to move, the main rod is made to rotate relative to the auxiliary rod till the limiting block on the main rod makes contact with the limiting block on the auxiliary rod, rotation is stopped, and the main rodis rotated, unfolded and l