172results about How to "Guaranteed to close" patented technology

The invention discloses a lower flap gate provided with an automatic sewage disposal device, which comprises a gate plate, wherein the bottom of the gate plate is connected with a gate bottom sill arranged in a riverway through a supporting hinged shaft; a connection lifting lug arranged at the upper part of an upstream face of the gate plate is connected with an expansion rod of a hydraulic hoist placed at the top of a gate pier; the bottom of the upstream face of the gate plate is connected with a sewage disposal plate through a movable hinged shaft; the sewage disposal plate extends to the upper surface of the gate bottom sill; and the width of the sewage disposal plate is matched with the width of a gate hole of the riverway. The sewage disposal plate is formed by combining a plurality of parallel steel plates; and the front end parts of the steel plates are provided with oblique plane cutting edge structures. The lower flap gate has the advantages that the lower flap gate is simple in structure and ingenious in conception; a dead angle at an intersection (namely the gate bottom sill) between a downstream bottom face of the riverway and the gate plate is blocked off by utilizing the sewage disposal plate connected with the bottom of the upstream face of the gate plate in a hinged manner, so that the problem of silting of sediment at the bottom of the gate is solved thoroughly; complete gate closure and in-place water shutoff are ensured; and water leakage of the gate does not appear.