Damage-proof device for waste rock blocking support tensioning oil cylinder

The utility model discloses an anti-damage device for a gangue blocking support tensioning oil cylinder, which relates to the technical field of gangue blocking supports, and comprises a main body, the main body comprises a top beam and a shield beam, the top beam and the shield beam are movably connected through a connecting rod device, the bottom end of the top beam is provided with an empty groove, a first rotating rod is arranged in the empty groove, and a second rotating rod is arranged in the empty groove. The bottom end of the shield beam is fixedly connected with two opposite fixing plates, first limiting rotating grooves are formed in the two sides of the fixing plates, the connecting rod device is movably connected to the outer wall of a first rotating rod, and the first rotating rod is fixedly connected into the first limiting rotating grooves. The angle between the hydraulic cylinder and the top beam is changed through the third rotating rod, and the angle between the connecting rod and the shield