Double-cylinder double-lifting loop

The utility model discloses a double-cylinder double-lifting loop which comprises a loop device main body, a loop rising roller is arranged on the loop device main body, a support is fixed on the loop device main body right above the loop rising roller through a bolt, the support is connected with one end of an air cylinder, the other end of the air cylinder is connected with a middle transverse plate, and the other end of the middle transverse plate is connected with the loop rising roller. The two sides of the middle transverse plate are respectively provided with a pull rod, each pull rod is a double-end screw and is fixed with the middle transverse plate through a nut, the other end of each pull rod is fixed with a lifting cylinder head through a thread, the lifting cylinder head is fixed on a swing arm through a shaft pin, one end of the swing arm is fixed with a support for fixing a loop rising roller through a bolt, and the other end of the swing arm is fixed with a lifting cylinder head. And the other