Synchronous unfolding mechanism for grid fins

The invention relates to a synchronous unfolding mechanism for grid fins. The synchronous unfolding mechanism for the grid fins comprises a base body which is fixedly connected with one end of a model, a limiting ring is matched with the periphery of the base body, one ends of multiple connecting rods are hinged to the limiting ring through connecting shafts, the other ends of the connecting rods are movably connected with multiple grid fins through grid fin shafts, the periphery of each grid fin shaft is connected with a torsion spring in a sleeved mode, and the grid fins are evenly distributed on the periphery of the base body in the peripheral direction. The synchronous unfolding mechanism for the grid fins is simple in structure, convenient to use and capable of being connected with the test model, switching of the grid fins from the folding state to the unfolding state is achieved by using the connecting rods and the tension springs, the unfolding states of all the grid fins are synchronous, and the stable control of a trajectory is effectively achieved; by means of the synchronous unfolding mechanism for the grid fins, when all the grid fins are folded on the periphery of the model, the outer diameter between a pair of adjacent grid fins is not more than the maximum diameter of the model.