Heavy dustproof hinge

The utility model discloses a heavy dustproof hinge, which relates to the technical field of hinges and comprises a bottom plate, a fixed in-position cylinder is arranged at the front end of the bottom plate, and a copper gasket is placed in the front middle of the bottom plate. A short arm and a middle arm are arranged on the surface of the copper gasket and are hinged with the bottom plate through the copper gasket; a strip-shaped sliding groove is formed in the rear end of the bottom plate, and a nylon sliding block is arranged above the strip-shaped sliding groove. A long arm is arranged on the front face of the nylon sliding block and hinged to the bottom plate through the nylon sliding block. Two concave tables are arranged at the front end and the rear end of the bottom plate, inner hexagon screws are arranged at the concave tables, and the inner hexagon screws are hinged to the lower installation rotary pieces below through the bottom plate. When the window is installed, the inner hexagonal screw is r