Movable double-semicircle reinforcement concave accessory

The utility model discloses a movable double-semicircle reinforcement concave accessory. The component comprises a first component body and a second component body, wherein the first part body and thesecond part body have the same structure and are symmetrically arranged; wherein the first component body comprises a semicircular bottom plate; bottom plate horizontally arranged, a baffle is fixedto the edge of the top of the bottom plate. Vertical arrangement of baffles, the top cross section of the baffle is of an arc-shaped structure; a first storage groove is formed in the outer wall of the side, close to the second component body, of the baffle on the first component body. And a first air bag is fixed in the first storage groove, a second storage groove located in the bottom of the baffle is formed below the first air bag, a second air bag is fixed in the second storage groove, the first air bag and the second air bag communicate with each other, and a connecting rod is fixed to the side wall, close to the