Rotation limiting device for tower crane

The utility model discloses a rotary limiting device for a tower crane, which belongs to the technical field of tower cranes and comprises a rack, a fixed plate is fixed on the rack, a straight plate and a limiting plate are arranged at the top end of the fixed plate, a support rod is fixed on the outer side of the limiting plate, and an inclined plate and a movable plate are arranged on the outer side of the limiting plate. A groove is formed in the other end of the supporting rod, the supporting rod is connected with the inclined plate through two first telescopic rods and two first springs, the two first springs surround the side faces of the two first telescopic rods respectively, and a first sliding groove is formed in the inclined face of the inclined plate; a first straight rod and a second straight rod are fixed to the inner side of the movable plate, one end of the first straight rod is located in the groove and connected with the groove through a second spring, the second straight rod is located in