2results about How to "Great opening force" patented technology

The utility model relates to a fireproof check valve. The fireproof check valve comprises an opening capable of opening and closing a valve seat and a valve plate unit used for achieving directional circulation and sealing functions with a valve body. The check valve is characterized in that the valve plate unit comprises a first valve plate and a second valve plate which are relatively independently pivoted on the valve body through a common pivot shaft, and a first elastic piece which can enable each valve plate to always have a trend of closing a corresponding opening of the valve plate is arranged on the pivot shaft, the first valve plate and / or the second valve plate are respectively provided with an acting part, and the acting parts can mutually apply acting force to open corresponding openings of the first valve plate and / or the second valve plate under the action of oil smoke, compared with the prior art, the range hood has the advantages that the acting parts are respectively arranged on the first valve plate and / or the second valve plate, so that the oil smoke can be effectively prevented from entering the range hood under the action of air pressure of the range hood; the force is transmitted to the first valve plate and / or the second valve plate, the opening force of the first valve plate or the second valve plate is increased, and the first valve plate and the second valve plate are opened synchronously.

This invention belongs to the technical field of material roll stop mechanism in electromechanical science, and relates to a material roll synchronous self-locking stop mechanism. An electric slide is provided on the upper surface of the worktable, and a traction device for pulling the material strip is slidably connected to the electric slide. A mounting base is installed at the end of the upper surface of the worktable away from the traction device. A first mounting plate is fixedly connected to one side of the top of the mounting base, and a rotating roller is rotatably connected to the top of the first mounting plate. The stop mechanism utilizes its related structure to stop the material roll the instant the material strip becomes loose, thereby ensuring that the material roll does not continue to rotate due to inertia after the traction device stops pulling the material strip. This maintains a taut state that meets cutting standards after the traction device stops pulling. The lifting roller, based on different changes in the state of the material strip, quickly triggers the stop band to stop the rotating roller and releases the stop. Its overall structure is scientifically designed, its principle is simple, its operation is flexible, and it is environmentally friendly.